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/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.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/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
49 #include <linux/ftrace.h>
51 #include <asm/uaccess.h>
52 #include <asm/processor.h>
56 #include <asm/stacktrace.h>
60 static int deprecated_sysctl_warning(struct __sysctl_args *args);
62 #if defined(CONFIG_SYSCTL)
64 /* External variables not in a header file. */
66 extern int print_fatal_signals;
67 extern int sysctl_overcommit_memory;
68 extern int sysctl_overcommit_ratio;
69 extern int sysctl_panic_on_oom;
70 extern int sysctl_oom_kill_allocating_task;
71 extern int sysctl_oom_dump_tasks;
72 extern int max_threads;
73 extern int core_uses_pid;
74 extern int suid_dumpable;
75 extern char core_pattern[];
77 extern int min_free_kbytes;
78 extern int pid_max_min, pid_max_max;
79 extern int sysctl_drop_caches;
80 extern int percpu_pagelist_fraction;
81 extern int compat_log;
82 extern int maps_protect;
83 extern int sysctl_stat_interval;
84 extern int latencytop_enabled;
85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
87 /* Constants used for minimum and maximum */
88 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
92 #ifdef CONFIG_DETECT_SOFTLOCKUP
93 static int sixty = 60;
101 static int one_hundred = 100;
103 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
104 static int maxolduid = 65535;
105 static int minolduid;
106 static int min_percpu_pagelist_fract = 8;
108 static int ngroups_max = NGROUPS_MAX;
111 extern char modprobe_path[];
113 #ifdef CONFIG_CHR_DEV_SG
114 extern int sg_big_buff;
118 extern char reboot_command [];
119 extern int stop_a_enabled;
120 extern int scons_pwroff;
124 extern int pwrsw_enabled;
125 extern int unaligned_enabled;
129 #ifdef CONFIG_MATHEMU
130 extern int sysctl_ieee_emulation_warnings;
132 extern int sysctl_userprocess_debug;
133 extern int spin_retry;
136 extern int sysctl_hz_timer;
138 #ifdef CONFIG_BSD_PROCESS_ACCT
139 extern int acct_parm[];
143 extern int no_unaligned_warning;
146 #ifdef CONFIG_RT_MUTEXES
147 extern int max_lock_depth;
150 #ifdef CONFIG_PROC_SYSCTL
151 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
152 void __user *buffer, size_t *lenp, loff_t *ppos);
153 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
154 void __user *buffer, size_t *lenp, loff_t *ppos);
157 static struct ctl_table root_table[];
158 static struct ctl_table_root sysctl_table_root;
159 static struct ctl_table_header root_table_header = {
160 .ctl_table = root_table,
161 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
162 .root = &sysctl_table_root,
164 static struct ctl_table_root sysctl_table_root = {
165 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
166 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
169 static struct ctl_table kern_table[];
170 static struct ctl_table vm_table[];
171 static struct ctl_table fs_table[];
172 static struct ctl_table debug_table[];
173 static struct ctl_table dev_table[];
174 extern struct ctl_table random_table[];
175 #ifdef CONFIG_INOTIFY_USER
176 extern struct ctl_table inotify_table[];
179 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
180 int sysctl_legacy_va_layout;
183 extern int prove_locking;
184 extern int lock_stat;
186 /* The default sysctl tables: */
188 static struct ctl_table root_table[] = {
190 .ctl_name = CTL_KERN,
191 .procname = "kernel",
208 .ctl_name = CTL_DEBUG,
211 .child = debug_table,
220 * NOTE: do not add new entries to this table unless you have read
221 * Documentation/sysctl/ctl_unnumbered.txt
226 #ifdef CONFIG_SCHED_DEBUG
227 static int min_sched_granularity_ns = 100000; /* 100 usecs */
228 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
229 static int min_wakeup_granularity_ns; /* 0 usecs */
230 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
233 static struct ctl_table kern_table[] = {
234 #ifdef CONFIG_SCHED_DEBUG
236 .ctl_name = CTL_UNNUMBERED,
237 .procname = "sched_min_granularity_ns",
238 .data = &sysctl_sched_min_granularity,
239 .maxlen = sizeof(unsigned int),
241 .proc_handler = &sched_nr_latency_handler,
242 .strategy = &sysctl_intvec,
243 .extra1 = &min_sched_granularity_ns,
244 .extra2 = &max_sched_granularity_ns,
247 .ctl_name = CTL_UNNUMBERED,
248 .procname = "sched_latency_ns",
249 .data = &sysctl_sched_latency,
250 .maxlen = sizeof(unsigned int),
252 .proc_handler = &sched_nr_latency_handler,
253 .strategy = &sysctl_intvec,
254 .extra1 = &min_sched_granularity_ns,
255 .extra2 = &max_sched_granularity_ns,
258 .ctl_name = CTL_UNNUMBERED,
259 .procname = "sched_wakeup_granularity_ns",
260 .data = &sysctl_sched_wakeup_granularity,
261 .maxlen = sizeof(unsigned int),
263 .proc_handler = &proc_dointvec_minmax,
264 .strategy = &sysctl_intvec,
265 .extra1 = &min_wakeup_granularity_ns,
266 .extra2 = &max_wakeup_granularity_ns,
269 .ctl_name = CTL_UNNUMBERED,
270 .procname = "sched_shares_ratelimit",
271 .data = &sysctl_sched_shares_ratelimit,
272 .maxlen = sizeof(unsigned int),
274 .proc_handler = &proc_dointvec,
277 .ctl_name = CTL_UNNUMBERED,
278 .procname = "sched_child_runs_first",
279 .data = &sysctl_sched_child_runs_first,
280 .maxlen = sizeof(unsigned int),
282 .proc_handler = &proc_dointvec,
285 .ctl_name = CTL_UNNUMBERED,
286 .procname = "sched_features",
287 .data = &sysctl_sched_features,
288 .maxlen = sizeof(unsigned int),
290 .proc_handler = &proc_dointvec,
293 .ctl_name = CTL_UNNUMBERED,
294 .procname = "sched_migration_cost",
295 .data = &sysctl_sched_migration_cost,
296 .maxlen = sizeof(unsigned int),
298 .proc_handler = &proc_dointvec,
301 .ctl_name = CTL_UNNUMBERED,
302 .procname = "sched_nr_migrate",
303 .data = &sysctl_sched_nr_migrate,
304 .maxlen = sizeof(unsigned int),
306 .proc_handler = &proc_dointvec,
310 .ctl_name = CTL_UNNUMBERED,
311 .procname = "sched_rt_period_us",
312 .data = &sysctl_sched_rt_period,
313 .maxlen = sizeof(unsigned int),
315 .proc_handler = &sched_rt_handler,
318 .ctl_name = CTL_UNNUMBERED,
319 .procname = "sched_rt_runtime_us",
320 .data = &sysctl_sched_rt_runtime,
321 .maxlen = sizeof(int),
323 .proc_handler = &sched_rt_handler,
326 .ctl_name = CTL_UNNUMBERED,
327 .procname = "sched_compat_yield",
328 .data = &sysctl_sched_compat_yield,
329 .maxlen = sizeof(unsigned int),
331 .proc_handler = &proc_dointvec,
333 #ifdef CONFIG_PROVE_LOCKING
335 .ctl_name = CTL_UNNUMBERED,
336 .procname = "prove_locking",
337 .data = &prove_locking,
338 .maxlen = sizeof(int),
340 .proc_handler = &proc_dointvec,
343 #ifdef CONFIG_LOCK_STAT
345 .ctl_name = CTL_UNNUMBERED,
346 .procname = "lock_stat",
348 .maxlen = sizeof(int),
350 .proc_handler = &proc_dointvec,
354 .ctl_name = KERN_PANIC,
356 .data = &panic_timeout,
357 .maxlen = sizeof(int),
359 .proc_handler = &proc_dointvec,
362 .ctl_name = KERN_CORE_USES_PID,
363 .procname = "core_uses_pid",
364 .data = &core_uses_pid,
365 .maxlen = sizeof(int),
367 .proc_handler = &proc_dointvec,
370 .ctl_name = KERN_CORE_PATTERN,
371 .procname = "core_pattern",
372 .data = core_pattern,
373 .maxlen = CORENAME_MAX_SIZE,
375 .proc_handler = &proc_dostring,
376 .strategy = &sysctl_string,
378 #ifdef CONFIG_PROC_SYSCTL
380 .procname = "tainted",
382 .maxlen = sizeof(int),
384 .proc_handler = &proc_dointvec_taint,
387 #ifdef CONFIG_LATENCYTOP
389 .procname = "latencytop",
390 .data = &latencytop_enabled,
391 .maxlen = sizeof(int),
393 .proc_handler = &proc_dointvec,
396 #ifdef CONFIG_BLK_DEV_INITRD
398 .ctl_name = KERN_REALROOTDEV,
399 .procname = "real-root-dev",
400 .data = &real_root_dev,
401 .maxlen = sizeof(int),
403 .proc_handler = &proc_dointvec,
407 .ctl_name = CTL_UNNUMBERED,
408 .procname = "print-fatal-signals",
409 .data = &print_fatal_signals,
410 .maxlen = sizeof(int),
412 .proc_handler = &proc_dointvec,
416 .ctl_name = KERN_SPARC_REBOOT,
417 .procname = "reboot-cmd",
418 .data = reboot_command,
421 .proc_handler = &proc_dostring,
422 .strategy = &sysctl_string,
425 .ctl_name = KERN_SPARC_STOP_A,
426 .procname = "stop-a",
427 .data = &stop_a_enabled,
428 .maxlen = sizeof (int),
430 .proc_handler = &proc_dointvec,
433 .ctl_name = KERN_SPARC_SCONS_PWROFF,
434 .procname = "scons-poweroff",
435 .data = &scons_pwroff,
436 .maxlen = sizeof (int),
438 .proc_handler = &proc_dointvec,
443 .ctl_name = KERN_HPPA_PWRSW,
444 .procname = "soft-power",
445 .data = &pwrsw_enabled,
446 .maxlen = sizeof (int),
448 .proc_handler = &proc_dointvec,
451 .ctl_name = KERN_HPPA_UNALIGNED,
452 .procname = "unaligned-trap",
453 .data = &unaligned_enabled,
454 .maxlen = sizeof (int),
456 .proc_handler = &proc_dointvec,
460 .ctl_name = KERN_CTLALTDEL,
461 .procname = "ctrl-alt-del",
463 .maxlen = sizeof(int),
465 .proc_handler = &proc_dointvec,
469 .ctl_name = CTL_UNNUMBERED,
470 .procname = "ftrace_enabled",
471 .data = &ftrace_enabled,
472 .maxlen = sizeof(int),
474 .proc_handler = &ftrace_enable_sysctl,
479 .ctl_name = KERN_MODPROBE,
480 .procname = "modprobe",
481 .data = &modprobe_path,
482 .maxlen = KMOD_PATH_LEN,
484 .proc_handler = &proc_dostring,
485 .strategy = &sysctl_string,
488 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
490 .ctl_name = KERN_HOTPLUG,
491 .procname = "hotplug",
492 .data = &uevent_helper,
493 .maxlen = UEVENT_HELPER_PATH_LEN,
495 .proc_handler = &proc_dostring,
496 .strategy = &sysctl_string,
499 #ifdef CONFIG_CHR_DEV_SG
501 .ctl_name = KERN_SG_BIG_BUFF,
502 .procname = "sg-big-buff",
503 .data = &sg_big_buff,
504 .maxlen = sizeof (int),
506 .proc_handler = &proc_dointvec,
509 #ifdef CONFIG_BSD_PROCESS_ACCT
511 .ctl_name = KERN_ACCT,
514 .maxlen = 3*sizeof(int),
516 .proc_handler = &proc_dointvec,
519 #ifdef CONFIG_MAGIC_SYSRQ
521 .ctl_name = KERN_SYSRQ,
523 .data = &__sysrq_enabled,
524 .maxlen = sizeof (int),
526 .proc_handler = &proc_dointvec,
529 #ifdef CONFIG_PROC_SYSCTL
531 .procname = "cad_pid",
533 .maxlen = sizeof (int),
535 .proc_handler = &proc_do_cad_pid,
539 .ctl_name = KERN_MAX_THREADS,
540 .procname = "threads-max",
541 .data = &max_threads,
542 .maxlen = sizeof(int),
544 .proc_handler = &proc_dointvec,
547 .ctl_name = KERN_RANDOM,
548 .procname = "random",
550 .child = random_table,
553 .ctl_name = KERN_OVERFLOWUID,
554 .procname = "overflowuid",
555 .data = &overflowuid,
556 .maxlen = sizeof(int),
558 .proc_handler = &proc_dointvec_minmax,
559 .strategy = &sysctl_intvec,
560 .extra1 = &minolduid,
561 .extra2 = &maxolduid,
564 .ctl_name = KERN_OVERFLOWGID,
565 .procname = "overflowgid",
566 .data = &overflowgid,
567 .maxlen = sizeof(int),
569 .proc_handler = &proc_dointvec_minmax,
570 .strategy = &sysctl_intvec,
571 .extra1 = &minolduid,
572 .extra2 = &maxolduid,
575 #ifdef CONFIG_MATHEMU
577 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
578 .procname = "ieee_emulation_warnings",
579 .data = &sysctl_ieee_emulation_warnings,
580 .maxlen = sizeof(int),
582 .proc_handler = &proc_dointvec,
585 #ifdef CONFIG_NO_IDLE_HZ
587 .ctl_name = KERN_HZ_TIMER,
588 .procname = "hz_timer",
589 .data = &sysctl_hz_timer,
590 .maxlen = sizeof(int),
592 .proc_handler = &proc_dointvec,
596 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
597 .procname = "userprocess_debug",
598 .data = &sysctl_userprocess_debug,
599 .maxlen = sizeof(int),
601 .proc_handler = &proc_dointvec,
605 .ctl_name = KERN_PIDMAX,
606 .procname = "pid_max",
608 .maxlen = sizeof (int),
610 .proc_handler = &proc_dointvec_minmax,
611 .strategy = sysctl_intvec,
612 .extra1 = &pid_max_min,
613 .extra2 = &pid_max_max,
616 .ctl_name = KERN_PANIC_ON_OOPS,
617 .procname = "panic_on_oops",
618 .data = &panic_on_oops,
619 .maxlen = sizeof(int),
621 .proc_handler = &proc_dointvec,
623 #if defined CONFIG_PRINTK
625 .ctl_name = KERN_PRINTK,
626 .procname = "printk",
627 .data = &console_loglevel,
628 .maxlen = 4*sizeof(int),
630 .proc_handler = &proc_dointvec,
633 .ctl_name = KERN_PRINTK_RATELIMIT,
634 .procname = "printk_ratelimit",
635 .data = &printk_ratelimit_jiffies,
636 .maxlen = sizeof(int),
638 .proc_handler = &proc_dointvec_jiffies,
639 .strategy = &sysctl_jiffies,
642 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
643 .procname = "printk_ratelimit_burst",
644 .data = &printk_ratelimit_burst,
645 .maxlen = sizeof(int),
647 .proc_handler = &proc_dointvec,
651 .ctl_name = KERN_NGROUPS_MAX,
652 .procname = "ngroups_max",
653 .data = &ngroups_max,
654 .maxlen = sizeof (int),
656 .proc_handler = &proc_dointvec,
658 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
660 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
661 .procname = "unknown_nmi_panic",
662 .data = &unknown_nmi_panic,
663 .maxlen = sizeof (int),
665 .proc_handler = &proc_dointvec,
668 .procname = "nmi_watchdog",
669 .data = &nmi_watchdog_enabled,
670 .maxlen = sizeof (int),
672 .proc_handler = &proc_nmi_enabled,
675 #if defined(CONFIG_X86)
677 .ctl_name = KERN_PANIC_ON_NMI,
678 .procname = "panic_on_unrecovered_nmi",
679 .data = &panic_on_unrecovered_nmi,
680 .maxlen = sizeof(int),
682 .proc_handler = &proc_dointvec,
685 .ctl_name = KERN_BOOTLOADER_TYPE,
686 .procname = "bootloader_type",
687 .data = &bootloader_type,
688 .maxlen = sizeof (int),
690 .proc_handler = &proc_dointvec,
693 .ctl_name = CTL_UNNUMBERED,
694 .procname = "kstack_depth_to_print",
695 .data = &kstack_depth_to_print,
696 .maxlen = sizeof(int),
698 .proc_handler = &proc_dointvec,
701 .ctl_name = CTL_UNNUMBERED,
702 .procname = "io_delay_type",
703 .data = &io_delay_type,
704 .maxlen = sizeof(int),
706 .proc_handler = &proc_dointvec,
709 #if defined(CONFIG_MMU)
711 .ctl_name = KERN_RANDOMIZE,
712 .procname = "randomize_va_space",
713 .data = &randomize_va_space,
714 .maxlen = sizeof(int),
716 .proc_handler = &proc_dointvec,
719 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
721 .ctl_name = KERN_SPIN_RETRY,
722 .procname = "spin_retry",
724 .maxlen = sizeof (int),
726 .proc_handler = &proc_dointvec,
729 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
731 .procname = "acpi_video_flags",
732 .data = &acpi_realmode_flags,
733 .maxlen = sizeof (unsigned long),
735 .proc_handler = &proc_doulongvec_minmax,
740 .ctl_name = KERN_IA64_UNALIGNED,
741 .procname = "ignore-unaligned-usertrap",
742 .data = &no_unaligned_warning,
743 .maxlen = sizeof (int),
745 .proc_handler = &proc_dointvec,
748 #ifdef CONFIG_DETECT_SOFTLOCKUP
750 .ctl_name = CTL_UNNUMBERED,
751 .procname = "softlockup_thresh",
752 .data = &softlockup_thresh,
753 .maxlen = sizeof(unsigned long),
755 .proc_handler = &proc_doulongvec_minmax,
756 .strategy = &sysctl_intvec,
761 .ctl_name = CTL_UNNUMBERED,
762 .procname = "hung_task_check_count",
763 .data = &sysctl_hung_task_check_count,
764 .maxlen = sizeof(unsigned long),
766 .proc_handler = &proc_doulongvec_minmax,
767 .strategy = &sysctl_intvec,
770 .ctl_name = CTL_UNNUMBERED,
771 .procname = "hung_task_timeout_secs",
772 .data = &sysctl_hung_task_timeout_secs,
773 .maxlen = sizeof(unsigned long),
775 .proc_handler = &proc_doulongvec_minmax,
776 .strategy = &sysctl_intvec,
779 .ctl_name = CTL_UNNUMBERED,
780 .procname = "hung_task_warnings",
781 .data = &sysctl_hung_task_warnings,
782 .maxlen = sizeof(unsigned long),
784 .proc_handler = &proc_doulongvec_minmax,
785 .strategy = &sysctl_intvec,
790 .ctl_name = KERN_COMPAT_LOG,
791 .procname = "compat-log",
793 .maxlen = sizeof (int),
795 .proc_handler = &proc_dointvec,
798 #ifdef CONFIG_RT_MUTEXES
800 .ctl_name = KERN_MAX_LOCK_DEPTH,
801 .procname = "max_lock_depth",
802 .data = &max_lock_depth,
803 .maxlen = sizeof(int),
805 .proc_handler = &proc_dointvec,
808 #ifdef CONFIG_PROC_FS
810 .ctl_name = CTL_UNNUMBERED,
811 .procname = "maps_protect",
812 .data = &maps_protect,
813 .maxlen = sizeof(int),
815 .proc_handler = &proc_dointvec,
819 .ctl_name = CTL_UNNUMBERED,
820 .procname = "poweroff_cmd",
821 .data = &poweroff_cmd,
822 .maxlen = POWEROFF_CMD_PATH_LEN,
824 .proc_handler = &proc_dostring,
825 .strategy = &sysctl_string,
829 .ctl_name = CTL_UNNUMBERED,
832 .child = key_sysctls,
836 * NOTE: do not add new entries to this table unless you have read
837 * Documentation/sysctl/ctl_unnumbered.txt
842 static struct ctl_table vm_table[] = {
844 .ctl_name = VM_OVERCOMMIT_MEMORY,
845 .procname = "overcommit_memory",
846 .data = &sysctl_overcommit_memory,
847 .maxlen = sizeof(sysctl_overcommit_memory),
849 .proc_handler = &proc_dointvec,
852 .ctl_name = VM_PANIC_ON_OOM,
853 .procname = "panic_on_oom",
854 .data = &sysctl_panic_on_oom,
855 .maxlen = sizeof(sysctl_panic_on_oom),
857 .proc_handler = &proc_dointvec,
860 .ctl_name = CTL_UNNUMBERED,
861 .procname = "oom_kill_allocating_task",
862 .data = &sysctl_oom_kill_allocating_task,
863 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
865 .proc_handler = &proc_dointvec,
868 .ctl_name = CTL_UNNUMBERED,
869 .procname = "oom_dump_tasks",
870 .data = &sysctl_oom_dump_tasks,
871 .maxlen = sizeof(sysctl_oom_dump_tasks),
873 .proc_handler = &proc_dointvec,
876 .ctl_name = VM_OVERCOMMIT_RATIO,
877 .procname = "overcommit_ratio",
878 .data = &sysctl_overcommit_ratio,
879 .maxlen = sizeof(sysctl_overcommit_ratio),
881 .proc_handler = &proc_dointvec,
884 .ctl_name = VM_PAGE_CLUSTER,
885 .procname = "page-cluster",
886 .data = &page_cluster,
887 .maxlen = sizeof(int),
889 .proc_handler = &proc_dointvec,
892 .ctl_name = VM_DIRTY_BACKGROUND,
893 .procname = "dirty_background_ratio",
894 .data = &dirty_background_ratio,
895 .maxlen = sizeof(dirty_background_ratio),
897 .proc_handler = &proc_dointvec_minmax,
898 .strategy = &sysctl_intvec,
900 .extra2 = &one_hundred,
903 .ctl_name = VM_DIRTY_RATIO,
904 .procname = "dirty_ratio",
905 .data = &vm_dirty_ratio,
906 .maxlen = sizeof(vm_dirty_ratio),
908 .proc_handler = &dirty_ratio_handler,
909 .strategy = &sysctl_intvec,
911 .extra2 = &one_hundred,
914 .procname = "dirty_writeback_centisecs",
915 .data = &dirty_writeback_interval,
916 .maxlen = sizeof(dirty_writeback_interval),
918 .proc_handler = &dirty_writeback_centisecs_handler,
921 .procname = "dirty_expire_centisecs",
922 .data = &dirty_expire_interval,
923 .maxlen = sizeof(dirty_expire_interval),
925 .proc_handler = &proc_dointvec_userhz_jiffies,
928 .ctl_name = VM_NR_PDFLUSH_THREADS,
929 .procname = "nr_pdflush_threads",
930 .data = &nr_pdflush_threads,
931 .maxlen = sizeof nr_pdflush_threads,
932 .mode = 0444 /* read-only*/,
933 .proc_handler = &proc_dointvec,
936 .ctl_name = VM_SWAPPINESS,
937 .procname = "swappiness",
938 .data = &vm_swappiness,
939 .maxlen = sizeof(vm_swappiness),
941 .proc_handler = &proc_dointvec_minmax,
942 .strategy = &sysctl_intvec,
944 .extra2 = &one_hundred,
946 #ifdef CONFIG_HUGETLB_PAGE
948 .procname = "nr_hugepages",
949 .data = &max_huge_pages,
950 .maxlen = sizeof(unsigned long),
952 .proc_handler = &hugetlb_sysctl_handler,
953 .extra1 = (void *)&hugetlb_zero,
954 .extra2 = (void *)&hugetlb_infinity,
957 .ctl_name = VM_HUGETLB_GROUP,
958 .procname = "hugetlb_shm_group",
959 .data = &sysctl_hugetlb_shm_group,
960 .maxlen = sizeof(gid_t),
962 .proc_handler = &proc_dointvec,
965 .ctl_name = CTL_UNNUMBERED,
966 .procname = "hugepages_treat_as_movable",
967 .data = &hugepages_treat_as_movable,
968 .maxlen = sizeof(int),
970 .proc_handler = &hugetlb_treat_movable_handler,
973 .ctl_name = CTL_UNNUMBERED,
974 .procname = "nr_overcommit_hugepages",
975 .data = &sysctl_overcommit_huge_pages,
976 .maxlen = sizeof(sysctl_overcommit_huge_pages),
978 .proc_handler = &hugetlb_overcommit_handler,
982 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
983 .procname = "lowmem_reserve_ratio",
984 .data = &sysctl_lowmem_reserve_ratio,
985 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
987 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
988 .strategy = &sysctl_intvec,
991 .ctl_name = VM_DROP_PAGECACHE,
992 .procname = "drop_caches",
993 .data = &sysctl_drop_caches,
994 .maxlen = sizeof(int),
996 .proc_handler = drop_caches_sysctl_handler,
997 .strategy = &sysctl_intvec,
1000 .ctl_name = VM_MIN_FREE_KBYTES,
1001 .procname = "min_free_kbytes",
1002 .data = &min_free_kbytes,
1003 .maxlen = sizeof(min_free_kbytes),
1005 .proc_handler = &min_free_kbytes_sysctl_handler,
1006 .strategy = &sysctl_intvec,
1010 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1011 .procname = "percpu_pagelist_fraction",
1012 .data = &percpu_pagelist_fraction,
1013 .maxlen = sizeof(percpu_pagelist_fraction),
1015 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1016 .strategy = &sysctl_intvec,
1017 .extra1 = &min_percpu_pagelist_fract,
1021 .ctl_name = VM_MAX_MAP_COUNT,
1022 .procname = "max_map_count",
1023 .data = &sysctl_max_map_count,
1024 .maxlen = sizeof(sysctl_max_map_count),
1026 .proc_handler = &proc_dointvec
1030 .ctl_name = VM_LAPTOP_MODE,
1031 .procname = "laptop_mode",
1032 .data = &laptop_mode,
1033 .maxlen = sizeof(laptop_mode),
1035 .proc_handler = &proc_dointvec_jiffies,
1036 .strategy = &sysctl_jiffies,
1039 .ctl_name = VM_BLOCK_DUMP,
1040 .procname = "block_dump",
1041 .data = &block_dump,
1042 .maxlen = sizeof(block_dump),
1044 .proc_handler = &proc_dointvec,
1045 .strategy = &sysctl_intvec,
1049 .ctl_name = VM_VFS_CACHE_PRESSURE,
1050 .procname = "vfs_cache_pressure",
1051 .data = &sysctl_vfs_cache_pressure,
1052 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1054 .proc_handler = &proc_dointvec,
1055 .strategy = &sysctl_intvec,
1058 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1060 .ctl_name = VM_LEGACY_VA_LAYOUT,
1061 .procname = "legacy_va_layout",
1062 .data = &sysctl_legacy_va_layout,
1063 .maxlen = sizeof(sysctl_legacy_va_layout),
1065 .proc_handler = &proc_dointvec,
1066 .strategy = &sysctl_intvec,
1072 .ctl_name = VM_ZONE_RECLAIM_MODE,
1073 .procname = "zone_reclaim_mode",
1074 .data = &zone_reclaim_mode,
1075 .maxlen = sizeof(zone_reclaim_mode),
1077 .proc_handler = &proc_dointvec,
1078 .strategy = &sysctl_intvec,
1082 .ctl_name = VM_MIN_UNMAPPED,
1083 .procname = "min_unmapped_ratio",
1084 .data = &sysctl_min_unmapped_ratio,
1085 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1087 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1088 .strategy = &sysctl_intvec,
1090 .extra2 = &one_hundred,
1093 .ctl_name = VM_MIN_SLAB,
1094 .procname = "min_slab_ratio",
1095 .data = &sysctl_min_slab_ratio,
1096 .maxlen = sizeof(sysctl_min_slab_ratio),
1098 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1099 .strategy = &sysctl_intvec,
1101 .extra2 = &one_hundred,
1106 .ctl_name = CTL_UNNUMBERED,
1107 .procname = "stat_interval",
1108 .data = &sysctl_stat_interval,
1109 .maxlen = sizeof(sysctl_stat_interval),
1111 .proc_handler = &proc_dointvec_jiffies,
1112 .strategy = &sysctl_jiffies,
1115 #ifdef CONFIG_SECURITY
1117 .ctl_name = CTL_UNNUMBERED,
1118 .procname = "mmap_min_addr",
1119 .data = &mmap_min_addr,
1120 .maxlen = sizeof(unsigned long),
1122 .proc_handler = &proc_doulongvec_minmax,
1127 .ctl_name = CTL_UNNUMBERED,
1128 .procname = "numa_zonelist_order",
1129 .data = &numa_zonelist_order,
1130 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1132 .proc_handler = &numa_zonelist_order_handler,
1133 .strategy = &sysctl_string,
1136 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1137 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1139 .ctl_name = VM_VDSO_ENABLED,
1140 .procname = "vdso_enabled",
1141 .data = &vdso_enabled,
1142 .maxlen = sizeof(vdso_enabled),
1144 .proc_handler = &proc_dointvec,
1145 .strategy = &sysctl_intvec,
1149 #ifdef CONFIG_HIGHMEM
1151 .ctl_name = CTL_UNNUMBERED,
1152 .procname = "highmem_is_dirtyable",
1153 .data = &vm_highmem_is_dirtyable,
1154 .maxlen = sizeof(vm_highmem_is_dirtyable),
1156 .proc_handler = &proc_dointvec_minmax,
1157 .strategy = &sysctl_intvec,
1163 * NOTE: do not add new entries to this table unless you have read
1164 * Documentation/sysctl/ctl_unnumbered.txt
1169 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1170 static struct ctl_table binfmt_misc_table[] = {
1175 static struct ctl_table fs_table[] = {
1177 .ctl_name = FS_NRINODE,
1178 .procname = "inode-nr",
1179 .data = &inodes_stat,
1180 .maxlen = 2*sizeof(int),
1182 .proc_handler = &proc_dointvec,
1185 .ctl_name = FS_STATINODE,
1186 .procname = "inode-state",
1187 .data = &inodes_stat,
1188 .maxlen = 7*sizeof(int),
1190 .proc_handler = &proc_dointvec,
1193 .procname = "file-nr",
1194 .data = &files_stat,
1195 .maxlen = 3*sizeof(int),
1197 .proc_handler = &proc_nr_files,
1200 .ctl_name = FS_MAXFILE,
1201 .procname = "file-max",
1202 .data = &files_stat.max_files,
1203 .maxlen = sizeof(int),
1205 .proc_handler = &proc_dointvec,
1208 .ctl_name = CTL_UNNUMBERED,
1209 .procname = "nr_open",
1210 .data = &sysctl_nr_open,
1211 .maxlen = sizeof(int),
1213 .proc_handler = &proc_dointvec_minmax,
1214 .extra1 = &sysctl_nr_open_min,
1215 .extra2 = &sysctl_nr_open_max,
1218 .ctl_name = FS_DENTRY,
1219 .procname = "dentry-state",
1220 .data = &dentry_stat,
1221 .maxlen = 6*sizeof(int),
1223 .proc_handler = &proc_dointvec,
1226 .ctl_name = FS_OVERFLOWUID,
1227 .procname = "overflowuid",
1228 .data = &fs_overflowuid,
1229 .maxlen = sizeof(int),
1231 .proc_handler = &proc_dointvec_minmax,
1232 .strategy = &sysctl_intvec,
1233 .extra1 = &minolduid,
1234 .extra2 = &maxolduid,
1237 .ctl_name = FS_OVERFLOWGID,
1238 .procname = "overflowgid",
1239 .data = &fs_overflowgid,
1240 .maxlen = sizeof(int),
1242 .proc_handler = &proc_dointvec_minmax,
1243 .strategy = &sysctl_intvec,
1244 .extra1 = &minolduid,
1245 .extra2 = &maxolduid,
1248 .ctl_name = FS_LEASES,
1249 .procname = "leases-enable",
1250 .data = &leases_enable,
1251 .maxlen = sizeof(int),
1253 .proc_handler = &proc_dointvec,
1255 #ifdef CONFIG_DNOTIFY
1257 .ctl_name = FS_DIR_NOTIFY,
1258 .procname = "dir-notify-enable",
1259 .data = &dir_notify_enable,
1260 .maxlen = sizeof(int),
1262 .proc_handler = &proc_dointvec,
1267 .ctl_name = FS_LEASE_TIME,
1268 .procname = "lease-break-time",
1269 .data = &lease_break_time,
1270 .maxlen = sizeof(int),
1272 .proc_handler = &proc_dointvec_minmax,
1273 .strategy = &sysctl_intvec,
1278 .procname = "aio-nr",
1280 .maxlen = sizeof(aio_nr),
1282 .proc_handler = &proc_doulongvec_minmax,
1285 .procname = "aio-max-nr",
1286 .data = &aio_max_nr,
1287 .maxlen = sizeof(aio_max_nr),
1289 .proc_handler = &proc_doulongvec_minmax,
1291 #ifdef CONFIG_INOTIFY_USER
1293 .ctl_name = FS_INOTIFY,
1294 .procname = "inotify",
1296 .child = inotify_table,
1301 .ctl_name = KERN_SETUID_DUMPABLE,
1302 .procname = "suid_dumpable",
1303 .data = &suid_dumpable,
1304 .maxlen = sizeof(int),
1306 .proc_handler = &proc_dointvec,
1308 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1310 .ctl_name = CTL_UNNUMBERED,
1311 .procname = "binfmt_misc",
1313 .child = binfmt_misc_table,
1317 * NOTE: do not add new entries to this table unless you have read
1318 * Documentation/sysctl/ctl_unnumbered.txt
1323 static struct ctl_table debug_table[] = {
1324 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1326 .ctl_name = CTL_UNNUMBERED,
1327 .procname = "exception-trace",
1328 .data = &show_unhandled_signals,
1329 .maxlen = sizeof(int),
1331 .proc_handler = proc_dointvec
1337 static struct ctl_table dev_table[] = {
1341 static DEFINE_SPINLOCK(sysctl_lock);
1343 /* called under sysctl_lock */
1344 static int use_table(struct ctl_table_header *p)
1346 if (unlikely(p->unregistering))
1352 /* called under sysctl_lock */
1353 static void unuse_table(struct ctl_table_header *p)
1356 if (unlikely(p->unregistering))
1357 complete(p->unregistering);
1360 /* called under sysctl_lock, will reacquire if has to wait */
1361 static void start_unregistering(struct ctl_table_header *p)
1364 * if p->used is 0, nobody will ever touch that entry again;
1365 * we'll eliminate all paths to it before dropping sysctl_lock
1367 if (unlikely(p->used)) {
1368 struct completion wait;
1369 init_completion(&wait);
1370 p->unregistering = &wait;
1371 spin_unlock(&sysctl_lock);
1372 wait_for_completion(&wait);
1373 spin_lock(&sysctl_lock);
1376 * do not remove from the list until nobody holds it; walking the
1377 * list in do_sysctl() relies on that.
1379 list_del_init(&p->ctl_entry);
1382 void sysctl_head_finish(struct ctl_table_header *head)
1386 spin_lock(&sysctl_lock);
1388 spin_unlock(&sysctl_lock);
1391 static struct list_head *
1392 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1394 struct list_head *header_list;
1395 header_list = &root->header_list;
1397 header_list = root->lookup(root, namespaces);
1401 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1402 struct ctl_table_header *prev)
1404 struct ctl_table_root *root;
1405 struct list_head *header_list;
1406 struct ctl_table_header *head;
1407 struct list_head *tmp;
1409 spin_lock(&sysctl_lock);
1412 tmp = &prev->ctl_entry;
1416 tmp = &root_table_header.ctl_entry;
1418 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1420 if (!use_table(head))
1422 spin_unlock(&sysctl_lock);
1427 header_list = lookup_header_list(root, namespaces);
1428 if (tmp != header_list)
1432 root = list_entry(root->root_list.next,
1433 struct ctl_table_root, root_list);
1434 if (root == &sysctl_table_root)
1436 header_list = lookup_header_list(root, namespaces);
1437 } while (list_empty(header_list));
1438 tmp = header_list->next;
1441 spin_unlock(&sysctl_lock);
1445 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1447 return __sysctl_head_next(current->nsproxy, prev);
1450 void register_sysctl_root(struct ctl_table_root *root)
1452 spin_lock(&sysctl_lock);
1453 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1454 spin_unlock(&sysctl_lock);
1457 #ifdef CONFIG_SYSCTL_SYSCALL
1458 /* Perform the actual read/write of a sysctl table entry. */
1459 static int do_sysctl_strategy(struct ctl_table_root *root,
1460 struct ctl_table *table,
1461 int __user *name, int nlen,
1462 void __user *oldval, size_t __user *oldlenp,
1463 void __user *newval, size_t newlen)
1471 if (sysctl_perm(root, table, op))
1474 if (table->strategy) {
1475 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1483 /* If there is no strategy routine, or if the strategy returns
1484 * zero, proceed with automatic r/w */
1485 if (table->data && table->maxlen) {
1486 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1494 static int parse_table(int __user *name, int nlen,
1495 void __user *oldval, size_t __user *oldlenp,
1496 void __user *newval, size_t newlen,
1497 struct ctl_table_root *root,
1498 struct ctl_table *table)
1504 if (get_user(n, name))
1506 for ( ; table->ctl_name || table->procname; table++) {
1507 if (!table->ctl_name)
1509 if (n == table->ctl_name) {
1512 if (sysctl_perm(root, table, 001))
1516 table = table->child;
1519 error = do_sysctl_strategy(root, table, name, nlen,
1528 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1529 void __user *newval, size_t newlen)
1531 struct ctl_table_header *head;
1532 int error = -ENOTDIR;
1534 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1538 if (!oldlenp || get_user(old_len, oldlenp))
1542 for (head = sysctl_head_next(NULL); head;
1543 head = sysctl_head_next(head)) {
1544 error = parse_table(name, nlen, oldval, oldlenp,
1546 head->root, head->ctl_table);
1547 if (error != -ENOTDIR) {
1548 sysctl_head_finish(head);
1555 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1557 struct __sysctl_args tmp;
1560 if (copy_from_user(&tmp, args, sizeof(tmp)))
1563 error = deprecated_sysctl_warning(&tmp);
1568 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1569 tmp.newval, tmp.newlen);
1574 #endif /* CONFIG_SYSCTL_SYSCALL */
1577 * sysctl_perm does NOT grant the superuser all rights automatically, because
1578 * some sysctl variables are readonly even to root.
1581 static int test_perm(int mode, int op)
1585 else if (in_egroup_p(0))
1587 if ((mode & op & 0007) == op)
1592 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1597 error = security_sysctl(table, op);
1601 if (root->permissions)
1602 mode = root->permissions(root, current->nsproxy, table);
1606 return test_perm(mode, op);
1609 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1611 for (; table->ctl_name || table->procname; table++) {
1612 table->parent = parent;
1614 sysctl_set_parent(table, table->child);
1618 static __init int sysctl_init(void)
1620 sysctl_set_parent(NULL, root_table);
1621 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1624 err = sysctl_check_table(current->nsproxy, root_table);
1630 core_initcall(sysctl_init);
1633 * __register_sysctl_paths - register a sysctl hierarchy
1634 * @root: List of sysctl headers to register on
1635 * @namespaces: Data to compute which lists of sysctl entries are visible
1636 * @path: The path to the directory the sysctl table is in.
1637 * @table: the top-level table structure
1639 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1640 * array. A completely 0 filled entry terminates the table.
1642 * The members of the &struct ctl_table structure are used as follows:
1644 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1645 * must be unique within that level of sysctl
1647 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1648 * enter a sysctl file
1650 * data - a pointer to data for use by proc_handler
1652 * maxlen - the maximum size in bytes of the data
1654 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1656 * child - a pointer to the child sysctl table if this entry is a directory, or
1659 * proc_handler - the text handler routine (described below)
1661 * strategy - the strategy routine (described below)
1663 * de - for internal use by the sysctl routines
1665 * extra1, extra2 - extra pointers usable by the proc handler routines
1667 * Leaf nodes in the sysctl tree will be represented by a single file
1668 * under /proc; non-leaf nodes will be represented by directories.
1670 * sysctl(2) can automatically manage read and write requests through
1671 * the sysctl table. The data and maxlen fields of the ctl_table
1672 * struct enable minimal validation of the values being written to be
1673 * performed, and the mode field allows minimal authentication.
1675 * More sophisticated management can be enabled by the provision of a
1676 * strategy routine with the table entry. This will be called before
1677 * any automatic read or write of the data is performed.
1679 * The strategy routine may return
1681 * < 0 - Error occurred (error is passed to user process)
1683 * 0 - OK - proceed with automatic read or write.
1685 * > 0 - OK - read or write has been done by the strategy routine, so
1686 * return immediately.
1688 * There must be a proc_handler routine for any terminal nodes
1689 * mirrored under /proc/sys (non-terminals are handled by a built-in
1690 * directory handler). Several default handlers are available to
1691 * cover common cases -
1693 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1694 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1695 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1697 * It is the handler's job to read the input buffer from user memory
1698 * and process it. The handler should return 0 on success.
1700 * This routine returns %NULL on a failure to register, and a pointer
1701 * to the table header on success.
1703 struct ctl_table_header *__register_sysctl_paths(
1704 struct ctl_table_root *root,
1705 struct nsproxy *namespaces,
1706 const struct ctl_path *path, struct ctl_table *table)
1708 struct list_head *header_list;
1709 struct ctl_table_header *header;
1710 struct ctl_table *new, **prevp;
1711 unsigned int n, npath;
1713 /* Count the path components */
1714 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1718 * For each path component, allocate a 2-element ctl_table array.
1719 * The first array element will be filled with the sysctl entry
1720 * for this, the second will be the sentinel (ctl_name == 0).
1722 * We allocate everything in one go so that we don't have to
1723 * worry about freeing additional memory in unregister_sysctl_table.
1725 header = kzalloc(sizeof(struct ctl_table_header) +
1726 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1730 new = (struct ctl_table *) (header + 1);
1732 /* Now connect the dots */
1733 prevp = &header->ctl_table;
1734 for (n = 0; n < npath; ++n, ++path) {
1735 /* Copy the procname */
1736 new->procname = path->procname;
1737 new->ctl_name = path->ctl_name;
1741 prevp = &new->child;
1746 header->ctl_table_arg = table;
1748 INIT_LIST_HEAD(&header->ctl_entry);
1750 header->unregistering = NULL;
1751 header->root = root;
1752 sysctl_set_parent(NULL, header->ctl_table);
1753 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1754 if (sysctl_check_table(namespaces, header->ctl_table)) {
1759 spin_lock(&sysctl_lock);
1760 header_list = lookup_header_list(root, namespaces);
1761 list_add_tail(&header->ctl_entry, header_list);
1762 spin_unlock(&sysctl_lock);
1768 * register_sysctl_table_path - register a sysctl table hierarchy
1769 * @path: The path to the directory the sysctl table is in.
1770 * @table: the top-level table structure
1772 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1773 * array. A completely 0 filled entry terminates the table.
1775 * See __register_sysctl_paths for more details.
1777 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1778 struct ctl_table *table)
1780 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1785 * register_sysctl_table - register a sysctl table hierarchy
1786 * @table: the top-level table structure
1788 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1789 * array. A completely 0 filled entry terminates the table.
1791 * See register_sysctl_paths for more details.
1793 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1795 static const struct ctl_path null_path[] = { {} };
1797 return register_sysctl_paths(null_path, table);
1801 * unregister_sysctl_table - unregister a sysctl table hierarchy
1802 * @header: the header returned from register_sysctl_table
1804 * Unregisters the sysctl table and all children. proc entries may not
1805 * actually be removed until they are no longer used by anyone.
1807 void unregister_sysctl_table(struct ctl_table_header * header)
1814 spin_lock(&sysctl_lock);
1815 start_unregistering(header);
1816 spin_unlock(&sysctl_lock);
1820 #else /* !CONFIG_SYSCTL */
1821 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1826 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1827 struct ctl_table *table)
1832 void unregister_sysctl_table(struct ctl_table_header * table)
1836 #endif /* CONFIG_SYSCTL */
1842 #ifdef CONFIG_PROC_SYSCTL
1844 static int _proc_do_string(void* data, int maxlen, int write,
1845 struct file *filp, void __user *buffer,
1846 size_t *lenp, loff_t *ppos)
1852 if (!data || !maxlen || !*lenp) {
1860 while (len < *lenp) {
1861 if (get_user(c, p++))
1863 if (c == 0 || c == '\n')
1869 if(copy_from_user(data, buffer, len))
1871 ((char *) data)[len] = 0;
1889 if(copy_to_user(buffer, data, len))
1892 if(put_user('\n', ((char __user *) buffer) + len))
1903 * proc_dostring - read a string sysctl
1904 * @table: the sysctl table
1905 * @write: %TRUE if this is a write to the sysctl file
1906 * @filp: the file structure
1907 * @buffer: the user buffer
1908 * @lenp: the size of the user buffer
1909 * @ppos: file position
1911 * Reads/writes a string from/to the user buffer. If the kernel
1912 * buffer provided is not large enough to hold the string, the
1913 * string is truncated. The copied string is %NULL-terminated.
1914 * If the string is being read by the user process, it is copied
1915 * and a newline '\n' is added. It is truncated if the buffer is
1918 * Returns 0 on success.
1920 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1921 void __user *buffer, size_t *lenp, loff_t *ppos)
1923 return _proc_do_string(table->data, table->maxlen, write, filp,
1924 buffer, lenp, ppos);
1928 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1930 int write, void *data)
1933 *valp = *negp ? -*lvalp : *lvalp;
1938 *lvalp = (unsigned long)-val;
1941 *lvalp = (unsigned long)val;
1947 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1948 int write, struct file *filp, void __user *buffer,
1949 size_t *lenp, loff_t *ppos,
1950 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1951 int write, void *data),
1954 #define TMPBUFLEN 21
1955 int *i, vleft, first=1, neg, val;
1959 char buf[TMPBUFLEN], *p;
1960 char __user *s = buffer;
1962 if (!tbl_data || !table->maxlen || !*lenp ||
1963 (*ppos && !write)) {
1968 i = (int *) tbl_data;
1969 vleft = table->maxlen / sizeof(*i);
1973 conv = do_proc_dointvec_conv;
1975 for (; left && vleft--; i++, first=0) {
1990 if (len > sizeof(buf) - 1)
1991 len = sizeof(buf) - 1;
1992 if (copy_from_user(buf, s, len))
1996 if (*p == '-' && left > 1) {
2000 if (*p < '0' || *p > '9')
2003 lval = simple_strtoul(p, &p, 0);
2006 if ((len < left) && *p && !isspace(*p))
2013 if (conv(&neg, &lval, i, 1, data))
2020 if (conv(&neg, &lval, i, 0, data))
2023 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2027 if(copy_to_user(s, buf, len))
2034 if (!write && !first && left) {
2035 if(put_user('\n', s))
2042 if (get_user(c, s++))
2057 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2058 void __user *buffer, size_t *lenp, loff_t *ppos,
2059 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2060 int write, void *data),
2063 return __do_proc_dointvec(table->data, table, write, filp,
2064 buffer, lenp, ppos, conv, data);
2068 * proc_dointvec - read a vector of integers
2069 * @table: the sysctl table
2070 * @write: %TRUE if this is a write to the sysctl file
2071 * @filp: the file structure
2072 * @buffer: the user buffer
2073 * @lenp: the size of the user buffer
2074 * @ppos: file position
2076 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2077 * values from/to the user buffer, treated as an ASCII string.
2079 * Returns 0 on success.
2081 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2082 void __user *buffer, size_t *lenp, loff_t *ppos)
2084 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2092 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2094 int write, void *data)
2096 int op = *(int *)data;
2098 int val = *negp ? -*lvalp : *lvalp;
2100 case OP_SET: *valp = val; break;
2101 case OP_AND: *valp &= val; break;
2102 case OP_OR: *valp |= val; break;
2108 *lvalp = (unsigned long)-val;
2111 *lvalp = (unsigned long)val;
2118 * Taint values can only be increased
2120 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2121 void __user *buffer, size_t *lenp, loff_t *ppos)
2125 if (write && !capable(CAP_SYS_ADMIN))
2129 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2130 do_proc_dointvec_bset_conv,&op);
2133 struct do_proc_dointvec_minmax_conv_param {
2138 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2140 int write, void *data)
2142 struct do_proc_dointvec_minmax_conv_param *param = data;
2144 int val = *negp ? -*lvalp : *lvalp;
2145 if ((param->min && *param->min > val) ||
2146 (param->max && *param->max < val))
2153 *lvalp = (unsigned long)-val;
2156 *lvalp = (unsigned long)val;
2163 * proc_dointvec_minmax - read a vector of integers with min/max values
2164 * @table: the sysctl table
2165 * @write: %TRUE if this is a write to the sysctl file
2166 * @filp: the file structure
2167 * @buffer: the user buffer
2168 * @lenp: the size of the user buffer
2169 * @ppos: file position
2171 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2172 * values from/to the user buffer, treated as an ASCII string.
2174 * This routine will ensure the values are within the range specified by
2175 * table->extra1 (min) and table->extra2 (max).
2177 * Returns 0 on success.
2179 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2180 void __user *buffer, size_t *lenp, loff_t *ppos)
2182 struct do_proc_dointvec_minmax_conv_param param = {
2183 .min = (int *) table->extra1,
2184 .max = (int *) table->extra2,
2186 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2187 do_proc_dointvec_minmax_conv, ¶m);
2190 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2192 void __user *buffer,
2193 size_t *lenp, loff_t *ppos,
2194 unsigned long convmul,
2195 unsigned long convdiv)
2197 #define TMPBUFLEN 21
2198 unsigned long *i, *min, *max, val;
2199 int vleft, first=1, neg;
2201 char buf[TMPBUFLEN], *p;
2202 char __user *s = buffer;
2204 if (!data || !table->maxlen || !*lenp ||
2205 (*ppos && !write)) {
2210 i = (unsigned long *) data;
2211 min = (unsigned long *) table->extra1;
2212 max = (unsigned long *) table->extra2;
2213 vleft = table->maxlen / sizeof(unsigned long);
2216 for (; left && vleft--; i++, min++, max++, first=0) {
2231 if (len > TMPBUFLEN-1)
2233 if (copy_from_user(buf, s, len))
2237 if (*p == '-' && left > 1) {
2241 if (*p < '0' || *p > '9')
2243 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2245 if ((len < left) && *p && !isspace(*p))
2254 if ((min && val < *min) || (max && val > *max))
2261 sprintf(p, "%lu", convdiv * (*i) / convmul);
2265 if(copy_to_user(s, buf, len))
2272 if (!write && !first && left) {
2273 if(put_user('\n', s))
2280 if (get_user(c, s++))
2295 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2297 void __user *buffer,
2298 size_t *lenp, loff_t *ppos,
2299 unsigned long convmul,
2300 unsigned long convdiv)
2302 return __do_proc_doulongvec_minmax(table->data, table, write,
2303 filp, buffer, lenp, ppos, convmul, convdiv);
2307 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
2310 * @filp: the file structure
2311 * @buffer: the user buffer
2312 * @lenp: the size of the user buffer
2313 * @ppos: file position
2315 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2316 * values from/to the user buffer, treated as an ASCII string.
2318 * This routine will ensure the values are within the range specified by
2319 * table->extra1 (min) and table->extra2 (max).
2321 * Returns 0 on success.
2323 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2324 void __user *buffer, size_t *lenp, loff_t *ppos)
2326 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2330 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2331 * @table: the sysctl table
2332 * @write: %TRUE if this is a write to the sysctl file
2333 * @filp: the file structure
2334 * @buffer: the user buffer
2335 * @lenp: the size of the user buffer
2336 * @ppos: file position
2338 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2339 * values from/to the user buffer, treated as an ASCII string. The values
2340 * are treated as milliseconds, and converted to jiffies when they are stored.
2342 * This routine will ensure the values are within the range specified by
2343 * table->extra1 (min) and table->extra2 (max).
2345 * Returns 0 on success.
2347 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2349 void __user *buffer,
2350 size_t *lenp, loff_t *ppos)
2352 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2353 lenp, ppos, HZ, 1000l);
2357 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2359 int write, void *data)
2362 if (*lvalp > LONG_MAX / HZ)
2364 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2370 lval = (unsigned long)-val;
2373 lval = (unsigned long)val;
2380 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2382 int write, void *data)
2385 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2387 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2393 lval = (unsigned long)-val;
2396 lval = (unsigned long)val;
2398 *lvalp = jiffies_to_clock_t(lval);
2403 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2405 int write, void *data)
2408 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2414 lval = (unsigned long)-val;
2417 lval = (unsigned long)val;
2419 *lvalp = jiffies_to_msecs(lval);
2425 * proc_dointvec_jiffies - read a vector of integers as seconds
2426 * @table: the sysctl table
2427 * @write: %TRUE if this is a write to the sysctl file
2428 * @filp: the file structure
2429 * @buffer: the user buffer
2430 * @lenp: the size of the user buffer
2431 * @ppos: file position
2433 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2434 * values from/to the user buffer, treated as an ASCII string.
2435 * The values read are assumed to be in seconds, and are converted into
2438 * Returns 0 on success.
2440 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2441 void __user *buffer, size_t *lenp, loff_t *ppos)
2443 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2444 do_proc_dointvec_jiffies_conv,NULL);
2448 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2449 * @table: the sysctl table
2450 * @write: %TRUE if this is a write to the sysctl file
2451 * @filp: the file structure
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: pointer to the 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.
2458 * The values read are assumed to be in 1/USER_HZ seconds, and
2459 * are converted into jiffies.
2461 * Returns 0 on success.
2463 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2464 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2467 do_proc_dointvec_userhz_jiffies_conv,NULL);
2471 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2472 * @table: the sysctl table
2473 * @write: %TRUE if this is a write to the sysctl file
2474 * @filp: the file structure
2475 * @buffer: the user buffer
2476 * @lenp: the size of the user buffer
2477 * @ppos: file position
2478 * @ppos: the current position in the file
2480 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2481 * values from/to the user buffer, treated as an ASCII string.
2482 * The values read are assumed to be in 1/1000 seconds, and
2483 * are converted into jiffies.
2485 * Returns 0 on success.
2487 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2488 void __user *buffer, size_t *lenp, loff_t *ppos)
2490 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2491 do_proc_dointvec_ms_jiffies_conv, NULL);
2494 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2495 void __user *buffer, size_t *lenp, loff_t *ppos)
2497 struct pid *new_pid;
2501 tmp = pid_vnr(cad_pid);
2503 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2504 lenp, ppos, NULL, NULL);
2508 new_pid = find_get_pid(tmp);
2512 put_pid(xchg(&cad_pid, new_pid));
2516 #else /* CONFIG_PROC_FS */
2518 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2519 void __user *buffer, size_t *lenp, loff_t *ppos)
2524 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2525 void __user *buffer, size_t *lenp, loff_t *ppos)
2530 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2531 void __user *buffer, size_t *lenp, loff_t *ppos)
2536 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2537 void __user *buffer, size_t *lenp, loff_t *ppos)
2542 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2543 void __user *buffer, size_t *lenp, loff_t *ppos)
2548 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2549 void __user *buffer, size_t *lenp, loff_t *ppos)
2554 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2555 void __user *buffer, size_t *lenp, loff_t *ppos)
2560 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2562 void __user *buffer,
2563 size_t *lenp, loff_t *ppos)
2569 #endif /* CONFIG_PROC_FS */
2572 #ifdef CONFIG_SYSCTL_SYSCALL
2574 * General sysctl support routines
2577 /* The generic sysctl data routine (used if no strategy routine supplied) */
2578 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2579 void __user *oldval, size_t __user *oldlenp,
2580 void __user *newval, size_t newlen)
2584 /* Get out of I don't have a variable */
2585 if (!table->data || !table->maxlen)
2588 if (oldval && oldlenp) {
2589 if (get_user(len, oldlenp))
2592 if (len > table->maxlen)
2593 len = table->maxlen;
2594 if (copy_to_user(oldval, table->data, len))
2596 if (put_user(len, oldlenp))
2601 if (newval && newlen) {
2602 if (newlen > table->maxlen)
2603 newlen = table->maxlen;
2605 if (copy_from_user(table->data, newval, newlen))
2611 /* The generic string strategy routine: */
2612 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2613 void __user *oldval, size_t __user *oldlenp,
2614 void __user *newval, size_t newlen)
2616 if (!table->data || !table->maxlen)
2619 if (oldval && oldlenp) {
2621 if (get_user(bufsize, oldlenp))
2624 size_t len = strlen(table->data), copied;
2626 /* This shouldn't trigger for a well-formed sysctl */
2627 if (len > table->maxlen)
2628 len = table->maxlen;
2630 /* Copy up to a max of bufsize-1 bytes of the string */
2631 copied = (len >= bufsize) ? bufsize - 1 : len;
2633 if (copy_to_user(oldval, table->data, copied) ||
2634 put_user(0, (char __user *)(oldval + copied)))
2636 if (put_user(len, oldlenp))
2640 if (newval && newlen) {
2641 size_t len = newlen;
2642 if (len > table->maxlen)
2643 len = table->maxlen;
2644 if(copy_from_user(table->data, newval, len))
2646 if (len == table->maxlen)
2648 ((char *) table->data)[len] = 0;
2654 * This function makes sure that all of the integers in the vector
2655 * are between the minimum and maximum values given in the arrays
2656 * table->extra1 and table->extra2, respectively.
2658 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2659 void __user *oldval, size_t __user *oldlenp,
2660 void __user *newval, size_t newlen)
2663 if (newval && newlen) {
2664 int __user *vec = (int __user *) newval;
2665 int *min = (int *) table->extra1;
2666 int *max = (int *) table->extra2;
2670 if (newlen % sizeof(int) != 0)
2673 if (!table->extra1 && !table->extra2)
2676 if (newlen > table->maxlen)
2677 newlen = table->maxlen;
2678 length = newlen / sizeof(int);
2680 for (i = 0; i < length; i++) {
2682 if (get_user(value, vec + i))
2684 if (min && value < min[i])
2686 if (max && value > max[i])
2693 /* Strategy function to convert jiffies to seconds */
2694 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2695 void __user *oldval, size_t __user *oldlenp,
2696 void __user *newval, size_t newlen)
2698 if (oldval && oldlenp) {
2701 if (get_user(olen, oldlenp))
2706 if (olen < sizeof(int))
2709 val = *(int *)(table->data) / HZ;
2710 if (put_user(val, (int __user *)oldval))
2712 if (put_user(sizeof(int), oldlenp))
2716 if (newval && newlen) {
2718 if (newlen != sizeof(int))
2720 if (get_user(new, (int __user *)newval))
2722 *(int *)(table->data) = new*HZ;
2727 /* Strategy function to convert jiffies to seconds */
2728 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2729 void __user *oldval, size_t __user *oldlenp,
2730 void __user *newval, size_t newlen)
2732 if (oldval && oldlenp) {
2735 if (get_user(olen, oldlenp))
2740 if (olen < sizeof(int))
2743 val = jiffies_to_msecs(*(int *)(table->data));
2744 if (put_user(val, (int __user *)oldval))
2746 if (put_user(sizeof(int), oldlenp))
2750 if (newval && newlen) {
2752 if (newlen != sizeof(int))
2754 if (get_user(new, (int __user *)newval))
2756 *(int *)(table->data) = msecs_to_jiffies(new);
2763 #else /* CONFIG_SYSCTL_SYSCALL */
2766 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2768 struct __sysctl_args tmp;
2771 if (copy_from_user(&tmp, args, sizeof(tmp)))
2774 error = deprecated_sysctl_warning(&tmp);
2776 /* If no error reading the parameters then just -ENOSYS ... */
2783 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2784 void __user *oldval, size_t __user *oldlenp,
2785 void __user *newval, size_t newlen)
2790 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2791 void __user *oldval, size_t __user *oldlenp,
2792 void __user *newval, size_t newlen)
2797 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2798 void __user *oldval, size_t __user *oldlenp,
2799 void __user *newval, size_t newlen)
2804 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2805 void __user *oldval, size_t __user *oldlenp,
2806 void __user *newval, size_t newlen)
2811 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2812 void __user *oldval, size_t __user *oldlenp,
2813 void __user *newval, size_t newlen)
2818 #endif /* CONFIG_SYSCTL_SYSCALL */
2820 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2822 static int msg_count;
2823 int name[CTL_MAXNAME];
2826 /* Check args->nlen. */
2827 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2830 /* Read in the sysctl name for better debug message logging */
2831 for (i = 0; i < args->nlen; i++)
2832 if (get_user(name[i], args->name + i))
2835 /* Ignore accesses to kernel.version */
2836 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2839 if (msg_count < 5) {
2842 "warning: process `%s' used the deprecated sysctl "
2843 "system call with ", current->comm);
2844 for (i = 0; i < args->nlen; i++)
2845 printk("%d.", name[i]);
2852 * No sense putting this after each symbol definition, twice,
2853 * exception granted :-)
2855 EXPORT_SYMBOL(proc_dointvec);
2856 EXPORT_SYMBOL(proc_dointvec_jiffies);
2857 EXPORT_SYMBOL(proc_dointvec_minmax);
2858 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2859 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2860 EXPORT_SYMBOL(proc_dostring);
2861 EXPORT_SYMBOL(proc_doulongvec_minmax);
2862 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2863 EXPORT_SYMBOL(register_sysctl_table);
2864 EXPORT_SYMBOL(register_sysctl_paths);
2865 EXPORT_SYMBOL(sysctl_intvec);
2866 EXPORT_SYMBOL(sysctl_jiffies);
2867 EXPORT_SYMBOL(sysctl_ms_jiffies);
2868 EXPORT_SYMBOL(sysctl_string);
2869 EXPORT_SYMBOL(sysctl_data);
2870 EXPORT_SYMBOL(unregister_sysctl_table);