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>
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
55 #include <asm/stacktrace.h>
59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
61 #if defined(CONFIG_SYSCTL)
63 /* External variables not in a header file. */
65 extern int print_fatal_signals;
66 extern int sysctl_overcommit_memory;
67 extern int sysctl_overcommit_ratio;
68 extern int sysctl_panic_on_oom;
69 extern int sysctl_oom_kill_allocating_task;
70 extern int sysctl_oom_dump_tasks;
71 extern int max_threads;
72 extern int core_uses_pid;
73 extern int suid_dumpable;
74 extern char core_pattern[];
76 extern int min_free_kbytes;
77 extern int pid_max_min, pid_max_max;
78 extern int sysctl_drop_caches;
79 extern int percpu_pagelist_fraction;
80 extern int compat_log;
81 extern int maps_protect;
82 extern int sysctl_stat_interval;
83 extern int latencytop_enabled;
84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
85 #ifdef CONFIG_RCU_TORTURE_TEST
86 extern int rcutorture_runnable;
87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
89 /* Constants used for minimum and maximum */
90 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
94 #ifdef CONFIG_DETECT_SOFTLOCKUP
95 static int sixty = 60;
103 static int one_hundred = 100;
105 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
106 static int maxolduid = 65535;
107 static int minolduid;
108 static int min_percpu_pagelist_fract = 8;
110 static int ngroups_max = NGROUPS_MAX;
113 extern char modprobe_path[];
115 #ifdef CONFIG_CHR_DEV_SG
116 extern int sg_big_buff;
120 extern char reboot_command [];
121 extern int stop_a_enabled;
122 extern int scons_pwroff;
126 extern int pwrsw_enabled;
127 extern int unaligned_enabled;
131 #ifdef CONFIG_MATHEMU
132 extern int sysctl_ieee_emulation_warnings;
134 extern int sysctl_userprocess_debug;
135 extern int spin_retry;
138 extern int sysctl_hz_timer;
140 #ifdef CONFIG_BSD_PROCESS_ACCT
141 extern int acct_parm[];
145 extern int no_unaligned_warning;
148 #ifdef CONFIG_RT_MUTEXES
149 extern int max_lock_depth;
152 #ifdef CONFIG_PROC_SYSCTL
153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
154 void __user *buffer, size_t *lenp, loff_t *ppos);
155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
156 void __user *buffer, size_t *lenp, loff_t *ppos);
159 static struct ctl_table root_table[];
160 static struct ctl_table_root sysctl_table_root;
161 static struct ctl_table_header root_table_header = {
162 .ctl_table = root_table,
163 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
164 .root = &sysctl_table_root,
166 static struct ctl_table_root sysctl_table_root = {
167 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
168 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
171 static struct ctl_table kern_table[];
172 static struct ctl_table vm_table[];
173 static struct ctl_table fs_table[];
174 static struct ctl_table debug_table[];
175 static struct ctl_table dev_table[];
176 extern struct ctl_table random_table[];
177 #ifdef CONFIG_INOTIFY_USER
178 extern struct ctl_table inotify_table[];
181 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
182 int sysctl_legacy_va_layout;
185 extern int prove_locking;
186 extern int lock_stat;
188 /* The default sysctl tables: */
190 static struct ctl_table root_table[] = {
192 .ctl_name = CTL_KERN,
193 .procname = "kernel",
210 .ctl_name = CTL_DEBUG,
213 .child = debug_table,
222 * NOTE: do not add new entries to this table unless you have read
223 * Documentation/sysctl/ctl_unnumbered.txt
228 #ifdef CONFIG_SCHED_DEBUG
229 static int min_sched_granularity_ns = 100000; /* 100 usecs */
230 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
231 static int min_wakeup_granularity_ns; /* 0 usecs */
232 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
235 static struct ctl_table kern_table[] = {
236 #ifdef CONFIG_SCHED_DEBUG
238 .ctl_name = CTL_UNNUMBERED,
239 .procname = "sched_min_granularity_ns",
240 .data = &sysctl_sched_min_granularity,
241 .maxlen = sizeof(unsigned int),
243 .proc_handler = &sched_nr_latency_handler,
244 .strategy = &sysctl_intvec,
245 .extra1 = &min_sched_granularity_ns,
246 .extra2 = &max_sched_granularity_ns,
249 .ctl_name = CTL_UNNUMBERED,
250 .procname = "sched_latency_ns",
251 .data = &sysctl_sched_latency,
252 .maxlen = sizeof(unsigned int),
254 .proc_handler = &sched_nr_latency_handler,
255 .strategy = &sysctl_intvec,
256 .extra1 = &min_sched_granularity_ns,
257 .extra2 = &max_sched_granularity_ns,
260 .ctl_name = CTL_UNNUMBERED,
261 .procname = "sched_wakeup_granularity_ns",
262 .data = &sysctl_sched_wakeup_granularity,
263 .maxlen = sizeof(unsigned int),
265 .proc_handler = &proc_dointvec_minmax,
266 .strategy = &sysctl_intvec,
267 .extra1 = &min_wakeup_granularity_ns,
268 .extra2 = &max_wakeup_granularity_ns,
271 .ctl_name = CTL_UNNUMBERED,
272 .procname = "sched_child_runs_first",
273 .data = &sysctl_sched_child_runs_first,
274 .maxlen = sizeof(unsigned int),
276 .proc_handler = &proc_dointvec,
279 .ctl_name = CTL_UNNUMBERED,
280 .procname = "sched_features",
281 .data = &sysctl_sched_features,
282 .maxlen = sizeof(unsigned int),
284 .proc_handler = &proc_dointvec,
287 .ctl_name = CTL_UNNUMBERED,
288 .procname = "sched_migration_cost",
289 .data = &sysctl_sched_migration_cost,
290 .maxlen = sizeof(unsigned int),
292 .proc_handler = &proc_dointvec,
295 .ctl_name = CTL_UNNUMBERED,
296 .procname = "sched_nr_migrate",
297 .data = &sysctl_sched_nr_migrate,
298 .maxlen = sizeof(unsigned int),
300 .proc_handler = &proc_dointvec,
304 .ctl_name = CTL_UNNUMBERED,
305 .procname = "sched_rt_period_us",
306 .data = &sysctl_sched_rt_period,
307 .maxlen = sizeof(unsigned int),
309 .proc_handler = &sched_rt_handler,
312 .ctl_name = CTL_UNNUMBERED,
313 .procname = "sched_rt_runtime_us",
314 .data = &sysctl_sched_rt_runtime,
315 .maxlen = sizeof(int),
317 .proc_handler = &sched_rt_handler,
320 .ctl_name = CTL_UNNUMBERED,
321 .procname = "sched_compat_yield",
322 .data = &sysctl_sched_compat_yield,
323 .maxlen = sizeof(unsigned int),
325 .proc_handler = &proc_dointvec,
327 #ifdef CONFIG_PROVE_LOCKING
329 .ctl_name = CTL_UNNUMBERED,
330 .procname = "prove_locking",
331 .data = &prove_locking,
332 .maxlen = sizeof(int),
334 .proc_handler = &proc_dointvec,
337 #ifdef CONFIG_LOCK_STAT
339 .ctl_name = CTL_UNNUMBERED,
340 .procname = "lock_stat",
342 .maxlen = sizeof(int),
344 .proc_handler = &proc_dointvec,
348 .ctl_name = KERN_PANIC,
350 .data = &panic_timeout,
351 .maxlen = sizeof(int),
353 .proc_handler = &proc_dointvec,
356 .ctl_name = KERN_CORE_USES_PID,
357 .procname = "core_uses_pid",
358 .data = &core_uses_pid,
359 .maxlen = sizeof(int),
361 .proc_handler = &proc_dointvec,
364 .ctl_name = KERN_CORE_PATTERN,
365 .procname = "core_pattern",
366 .data = core_pattern,
367 .maxlen = CORENAME_MAX_SIZE,
369 .proc_handler = &proc_dostring,
370 .strategy = &sysctl_string,
372 #ifdef CONFIG_PROC_SYSCTL
374 .procname = "tainted",
376 .maxlen = sizeof(int),
378 .proc_handler = &proc_dointvec_taint,
381 #ifdef CONFIG_LATENCYTOP
383 .procname = "latencytop",
384 .data = &latencytop_enabled,
385 .maxlen = sizeof(int),
387 .proc_handler = &proc_dointvec,
390 #ifdef CONFIG_BLK_DEV_INITRD
392 .ctl_name = KERN_REALROOTDEV,
393 .procname = "real-root-dev",
394 .data = &real_root_dev,
395 .maxlen = sizeof(int),
397 .proc_handler = &proc_dointvec,
401 .ctl_name = CTL_UNNUMBERED,
402 .procname = "print-fatal-signals",
403 .data = &print_fatal_signals,
404 .maxlen = sizeof(int),
406 .proc_handler = &proc_dointvec,
410 .ctl_name = KERN_SPARC_REBOOT,
411 .procname = "reboot-cmd",
412 .data = reboot_command,
415 .proc_handler = &proc_dostring,
416 .strategy = &sysctl_string,
419 .ctl_name = KERN_SPARC_STOP_A,
420 .procname = "stop-a",
421 .data = &stop_a_enabled,
422 .maxlen = sizeof (int),
424 .proc_handler = &proc_dointvec,
427 .ctl_name = KERN_SPARC_SCONS_PWROFF,
428 .procname = "scons-poweroff",
429 .data = &scons_pwroff,
430 .maxlen = sizeof (int),
432 .proc_handler = &proc_dointvec,
437 .ctl_name = KERN_HPPA_PWRSW,
438 .procname = "soft-power",
439 .data = &pwrsw_enabled,
440 .maxlen = sizeof (int),
442 .proc_handler = &proc_dointvec,
445 .ctl_name = KERN_HPPA_UNALIGNED,
446 .procname = "unaligned-trap",
447 .data = &unaligned_enabled,
448 .maxlen = sizeof (int),
450 .proc_handler = &proc_dointvec,
454 .ctl_name = KERN_CTLALTDEL,
455 .procname = "ctrl-alt-del",
457 .maxlen = sizeof(int),
459 .proc_handler = &proc_dointvec,
463 .ctl_name = KERN_MODPROBE,
464 .procname = "modprobe",
465 .data = &modprobe_path,
466 .maxlen = KMOD_PATH_LEN,
468 .proc_handler = &proc_dostring,
469 .strategy = &sysctl_string,
472 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
474 .ctl_name = KERN_HOTPLUG,
475 .procname = "hotplug",
476 .data = &uevent_helper,
477 .maxlen = UEVENT_HELPER_PATH_LEN,
479 .proc_handler = &proc_dostring,
480 .strategy = &sysctl_string,
483 #ifdef CONFIG_CHR_DEV_SG
485 .ctl_name = KERN_SG_BIG_BUFF,
486 .procname = "sg-big-buff",
487 .data = &sg_big_buff,
488 .maxlen = sizeof (int),
490 .proc_handler = &proc_dointvec,
493 #ifdef CONFIG_BSD_PROCESS_ACCT
495 .ctl_name = KERN_ACCT,
498 .maxlen = 3*sizeof(int),
500 .proc_handler = &proc_dointvec,
503 #ifdef CONFIG_MAGIC_SYSRQ
505 .ctl_name = KERN_SYSRQ,
507 .data = &__sysrq_enabled,
508 .maxlen = sizeof (int),
510 .proc_handler = &proc_dointvec,
513 #ifdef CONFIG_PROC_SYSCTL
515 .procname = "cad_pid",
517 .maxlen = sizeof (int),
519 .proc_handler = &proc_do_cad_pid,
523 .ctl_name = KERN_MAX_THREADS,
524 .procname = "threads-max",
525 .data = &max_threads,
526 .maxlen = sizeof(int),
528 .proc_handler = &proc_dointvec,
531 .ctl_name = KERN_RANDOM,
532 .procname = "random",
534 .child = random_table,
537 .ctl_name = KERN_OVERFLOWUID,
538 .procname = "overflowuid",
539 .data = &overflowuid,
540 .maxlen = sizeof(int),
542 .proc_handler = &proc_dointvec_minmax,
543 .strategy = &sysctl_intvec,
544 .extra1 = &minolduid,
545 .extra2 = &maxolduid,
548 .ctl_name = KERN_OVERFLOWGID,
549 .procname = "overflowgid",
550 .data = &overflowgid,
551 .maxlen = sizeof(int),
553 .proc_handler = &proc_dointvec_minmax,
554 .strategy = &sysctl_intvec,
555 .extra1 = &minolduid,
556 .extra2 = &maxolduid,
559 #ifdef CONFIG_MATHEMU
561 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
562 .procname = "ieee_emulation_warnings",
563 .data = &sysctl_ieee_emulation_warnings,
564 .maxlen = sizeof(int),
566 .proc_handler = &proc_dointvec,
569 #ifdef CONFIG_NO_IDLE_HZ
571 .ctl_name = KERN_HZ_TIMER,
572 .procname = "hz_timer",
573 .data = &sysctl_hz_timer,
574 .maxlen = sizeof(int),
576 .proc_handler = &proc_dointvec,
580 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
581 .procname = "userprocess_debug",
582 .data = &sysctl_userprocess_debug,
583 .maxlen = sizeof(int),
585 .proc_handler = &proc_dointvec,
589 .ctl_name = KERN_PIDMAX,
590 .procname = "pid_max",
592 .maxlen = sizeof (int),
594 .proc_handler = &proc_dointvec_minmax,
595 .strategy = sysctl_intvec,
596 .extra1 = &pid_max_min,
597 .extra2 = &pid_max_max,
600 .ctl_name = KERN_PANIC_ON_OOPS,
601 .procname = "panic_on_oops",
602 .data = &panic_on_oops,
603 .maxlen = sizeof(int),
605 .proc_handler = &proc_dointvec,
607 #if defined CONFIG_PRINTK
609 .ctl_name = KERN_PRINTK,
610 .procname = "printk",
611 .data = &console_loglevel,
612 .maxlen = 4*sizeof(int),
614 .proc_handler = &proc_dointvec,
617 .ctl_name = KERN_PRINTK_RATELIMIT,
618 .procname = "printk_ratelimit",
619 .data = &printk_ratelimit_jiffies,
620 .maxlen = sizeof(int),
622 .proc_handler = &proc_dointvec_jiffies,
623 .strategy = &sysctl_jiffies,
626 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
627 .procname = "printk_ratelimit_burst",
628 .data = &printk_ratelimit_burst,
629 .maxlen = sizeof(int),
631 .proc_handler = &proc_dointvec,
635 .ctl_name = KERN_NGROUPS_MAX,
636 .procname = "ngroups_max",
637 .data = &ngroups_max,
638 .maxlen = sizeof (int),
640 .proc_handler = &proc_dointvec,
642 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
644 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
645 .procname = "unknown_nmi_panic",
646 .data = &unknown_nmi_panic,
647 .maxlen = sizeof (int),
649 .proc_handler = &proc_dointvec,
652 .procname = "nmi_watchdog",
653 .data = &nmi_watchdog_enabled,
654 .maxlen = sizeof (int),
656 .proc_handler = &proc_nmi_enabled,
659 #if defined(CONFIG_X86)
661 .ctl_name = KERN_PANIC_ON_NMI,
662 .procname = "panic_on_unrecovered_nmi",
663 .data = &panic_on_unrecovered_nmi,
664 .maxlen = sizeof(int),
666 .proc_handler = &proc_dointvec,
669 .ctl_name = KERN_BOOTLOADER_TYPE,
670 .procname = "bootloader_type",
671 .data = &bootloader_type,
672 .maxlen = sizeof (int),
674 .proc_handler = &proc_dointvec,
677 .ctl_name = CTL_UNNUMBERED,
678 .procname = "kstack_depth_to_print",
679 .data = &kstack_depth_to_print,
680 .maxlen = sizeof(int),
682 .proc_handler = &proc_dointvec,
685 .ctl_name = CTL_UNNUMBERED,
686 .procname = "io_delay_type",
687 .data = &io_delay_type,
688 .maxlen = sizeof(int),
690 .proc_handler = &proc_dointvec,
693 #if defined(CONFIG_MMU)
695 .ctl_name = KERN_RANDOMIZE,
696 .procname = "randomize_va_space",
697 .data = &randomize_va_space,
698 .maxlen = sizeof(int),
700 .proc_handler = &proc_dointvec,
703 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
705 .ctl_name = KERN_SPIN_RETRY,
706 .procname = "spin_retry",
708 .maxlen = sizeof (int),
710 .proc_handler = &proc_dointvec,
713 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
715 .procname = "acpi_video_flags",
716 .data = &acpi_realmode_flags,
717 .maxlen = sizeof (unsigned long),
719 .proc_handler = &proc_doulongvec_minmax,
724 .ctl_name = KERN_IA64_UNALIGNED,
725 .procname = "ignore-unaligned-usertrap",
726 .data = &no_unaligned_warning,
727 .maxlen = sizeof (int),
729 .proc_handler = &proc_dointvec,
732 #ifdef CONFIG_DETECT_SOFTLOCKUP
734 .ctl_name = CTL_UNNUMBERED,
735 .procname = "softlockup_thresh",
736 .data = &softlockup_thresh,
737 .maxlen = sizeof(unsigned long),
739 .proc_handler = &proc_doulongvec_minmax,
740 .strategy = &sysctl_intvec,
745 .ctl_name = CTL_UNNUMBERED,
746 .procname = "hung_task_check_count",
747 .data = &sysctl_hung_task_check_count,
748 .maxlen = sizeof(unsigned long),
750 .proc_handler = &proc_doulongvec_minmax,
751 .strategy = &sysctl_intvec,
754 .ctl_name = CTL_UNNUMBERED,
755 .procname = "hung_task_timeout_secs",
756 .data = &sysctl_hung_task_timeout_secs,
757 .maxlen = sizeof(unsigned long),
759 .proc_handler = &proc_doulongvec_minmax,
760 .strategy = &sysctl_intvec,
763 .ctl_name = CTL_UNNUMBERED,
764 .procname = "hung_task_warnings",
765 .data = &sysctl_hung_task_warnings,
766 .maxlen = sizeof(unsigned long),
768 .proc_handler = &proc_doulongvec_minmax,
769 .strategy = &sysctl_intvec,
774 .ctl_name = KERN_COMPAT_LOG,
775 .procname = "compat-log",
777 .maxlen = sizeof (int),
779 .proc_handler = &proc_dointvec,
782 #ifdef CONFIG_RT_MUTEXES
784 .ctl_name = KERN_MAX_LOCK_DEPTH,
785 .procname = "max_lock_depth",
786 .data = &max_lock_depth,
787 .maxlen = sizeof(int),
789 .proc_handler = &proc_dointvec,
792 #ifdef CONFIG_PROC_FS
794 .ctl_name = CTL_UNNUMBERED,
795 .procname = "maps_protect",
796 .data = &maps_protect,
797 .maxlen = sizeof(int),
799 .proc_handler = &proc_dointvec,
803 .ctl_name = CTL_UNNUMBERED,
804 .procname = "poweroff_cmd",
805 .data = &poweroff_cmd,
806 .maxlen = POWEROFF_CMD_PATH_LEN,
808 .proc_handler = &proc_dostring,
809 .strategy = &sysctl_string,
813 .ctl_name = CTL_UNNUMBERED,
816 .child = key_sysctls,
819 #ifdef CONFIG_RCU_TORTURE_TEST
821 .ctl_name = CTL_UNNUMBERED,
822 .procname = "rcutorture_runnable",
823 .data = &rcutorture_runnable,
824 .maxlen = sizeof(int),
826 .proc_handler = &proc_dointvec,
830 * NOTE: do not add new entries to this table unless you have read
831 * Documentation/sysctl/ctl_unnumbered.txt
836 static struct ctl_table vm_table[] = {
838 .ctl_name = VM_OVERCOMMIT_MEMORY,
839 .procname = "overcommit_memory",
840 .data = &sysctl_overcommit_memory,
841 .maxlen = sizeof(sysctl_overcommit_memory),
843 .proc_handler = &proc_dointvec,
846 .ctl_name = VM_PANIC_ON_OOM,
847 .procname = "panic_on_oom",
848 .data = &sysctl_panic_on_oom,
849 .maxlen = sizeof(sysctl_panic_on_oom),
851 .proc_handler = &proc_dointvec,
854 .ctl_name = CTL_UNNUMBERED,
855 .procname = "oom_kill_allocating_task",
856 .data = &sysctl_oom_kill_allocating_task,
857 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
859 .proc_handler = &proc_dointvec,
862 .ctl_name = CTL_UNNUMBERED,
863 .procname = "oom_dump_tasks",
864 .data = &sysctl_oom_dump_tasks,
865 .maxlen = sizeof(sysctl_oom_dump_tasks),
867 .proc_handler = &proc_dointvec,
870 .ctl_name = VM_OVERCOMMIT_RATIO,
871 .procname = "overcommit_ratio",
872 .data = &sysctl_overcommit_ratio,
873 .maxlen = sizeof(sysctl_overcommit_ratio),
875 .proc_handler = &proc_dointvec,
878 .ctl_name = VM_PAGE_CLUSTER,
879 .procname = "page-cluster",
880 .data = &page_cluster,
881 .maxlen = sizeof(int),
883 .proc_handler = &proc_dointvec,
886 .ctl_name = VM_DIRTY_BACKGROUND,
887 .procname = "dirty_background_ratio",
888 .data = &dirty_background_ratio,
889 .maxlen = sizeof(dirty_background_ratio),
891 .proc_handler = &proc_dointvec_minmax,
892 .strategy = &sysctl_intvec,
894 .extra2 = &one_hundred,
897 .ctl_name = VM_DIRTY_RATIO,
898 .procname = "dirty_ratio",
899 .data = &vm_dirty_ratio,
900 .maxlen = sizeof(vm_dirty_ratio),
902 .proc_handler = &dirty_ratio_handler,
903 .strategy = &sysctl_intvec,
905 .extra2 = &one_hundred,
908 .procname = "dirty_writeback_centisecs",
909 .data = &dirty_writeback_interval,
910 .maxlen = sizeof(dirty_writeback_interval),
912 .proc_handler = &dirty_writeback_centisecs_handler,
915 .procname = "dirty_expire_centisecs",
916 .data = &dirty_expire_interval,
917 .maxlen = sizeof(dirty_expire_interval),
919 .proc_handler = &proc_dointvec_userhz_jiffies,
922 .ctl_name = VM_NR_PDFLUSH_THREADS,
923 .procname = "nr_pdflush_threads",
924 .data = &nr_pdflush_threads,
925 .maxlen = sizeof nr_pdflush_threads,
926 .mode = 0444 /* read-only*/,
927 .proc_handler = &proc_dointvec,
930 .ctl_name = VM_SWAPPINESS,
931 .procname = "swappiness",
932 .data = &vm_swappiness,
933 .maxlen = sizeof(vm_swappiness),
935 .proc_handler = &proc_dointvec_minmax,
936 .strategy = &sysctl_intvec,
938 .extra2 = &one_hundred,
940 #ifdef CONFIG_HUGETLB_PAGE
942 .procname = "nr_hugepages",
943 .data = &max_huge_pages,
944 .maxlen = sizeof(unsigned long),
946 .proc_handler = &hugetlb_sysctl_handler,
947 .extra1 = (void *)&hugetlb_zero,
948 .extra2 = (void *)&hugetlb_infinity,
951 .ctl_name = VM_HUGETLB_GROUP,
952 .procname = "hugetlb_shm_group",
953 .data = &sysctl_hugetlb_shm_group,
954 .maxlen = sizeof(gid_t),
956 .proc_handler = &proc_dointvec,
959 .ctl_name = CTL_UNNUMBERED,
960 .procname = "hugepages_treat_as_movable",
961 .data = &hugepages_treat_as_movable,
962 .maxlen = sizeof(int),
964 .proc_handler = &hugetlb_treat_movable_handler,
967 .ctl_name = CTL_UNNUMBERED,
968 .procname = "nr_overcommit_hugepages",
969 .data = &sysctl_overcommit_huge_pages,
970 .maxlen = sizeof(sysctl_overcommit_huge_pages),
972 .proc_handler = &hugetlb_overcommit_handler,
976 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
977 .procname = "lowmem_reserve_ratio",
978 .data = &sysctl_lowmem_reserve_ratio,
979 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
981 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
982 .strategy = &sysctl_intvec,
985 .ctl_name = VM_DROP_PAGECACHE,
986 .procname = "drop_caches",
987 .data = &sysctl_drop_caches,
988 .maxlen = sizeof(int),
990 .proc_handler = drop_caches_sysctl_handler,
991 .strategy = &sysctl_intvec,
994 .ctl_name = VM_MIN_FREE_KBYTES,
995 .procname = "min_free_kbytes",
996 .data = &min_free_kbytes,
997 .maxlen = sizeof(min_free_kbytes),
999 .proc_handler = &min_free_kbytes_sysctl_handler,
1000 .strategy = &sysctl_intvec,
1004 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1005 .procname = "percpu_pagelist_fraction",
1006 .data = &percpu_pagelist_fraction,
1007 .maxlen = sizeof(percpu_pagelist_fraction),
1009 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1010 .strategy = &sysctl_intvec,
1011 .extra1 = &min_percpu_pagelist_fract,
1015 .ctl_name = VM_MAX_MAP_COUNT,
1016 .procname = "max_map_count",
1017 .data = &sysctl_max_map_count,
1018 .maxlen = sizeof(sysctl_max_map_count),
1020 .proc_handler = &proc_dointvec
1024 .ctl_name = VM_LAPTOP_MODE,
1025 .procname = "laptop_mode",
1026 .data = &laptop_mode,
1027 .maxlen = sizeof(laptop_mode),
1029 .proc_handler = &proc_dointvec_jiffies,
1030 .strategy = &sysctl_jiffies,
1033 .ctl_name = VM_BLOCK_DUMP,
1034 .procname = "block_dump",
1035 .data = &block_dump,
1036 .maxlen = sizeof(block_dump),
1038 .proc_handler = &proc_dointvec,
1039 .strategy = &sysctl_intvec,
1043 .ctl_name = VM_VFS_CACHE_PRESSURE,
1044 .procname = "vfs_cache_pressure",
1045 .data = &sysctl_vfs_cache_pressure,
1046 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1048 .proc_handler = &proc_dointvec,
1049 .strategy = &sysctl_intvec,
1052 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1054 .ctl_name = VM_LEGACY_VA_LAYOUT,
1055 .procname = "legacy_va_layout",
1056 .data = &sysctl_legacy_va_layout,
1057 .maxlen = sizeof(sysctl_legacy_va_layout),
1059 .proc_handler = &proc_dointvec,
1060 .strategy = &sysctl_intvec,
1066 .ctl_name = VM_ZONE_RECLAIM_MODE,
1067 .procname = "zone_reclaim_mode",
1068 .data = &zone_reclaim_mode,
1069 .maxlen = sizeof(zone_reclaim_mode),
1071 .proc_handler = &proc_dointvec,
1072 .strategy = &sysctl_intvec,
1076 .ctl_name = VM_MIN_UNMAPPED,
1077 .procname = "min_unmapped_ratio",
1078 .data = &sysctl_min_unmapped_ratio,
1079 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1081 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1082 .strategy = &sysctl_intvec,
1084 .extra2 = &one_hundred,
1087 .ctl_name = VM_MIN_SLAB,
1088 .procname = "min_slab_ratio",
1089 .data = &sysctl_min_slab_ratio,
1090 .maxlen = sizeof(sysctl_min_slab_ratio),
1092 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1093 .strategy = &sysctl_intvec,
1095 .extra2 = &one_hundred,
1100 .ctl_name = CTL_UNNUMBERED,
1101 .procname = "stat_interval",
1102 .data = &sysctl_stat_interval,
1103 .maxlen = sizeof(sysctl_stat_interval),
1105 .proc_handler = &proc_dointvec_jiffies,
1106 .strategy = &sysctl_jiffies,
1109 #ifdef CONFIG_SECURITY
1111 .ctl_name = CTL_UNNUMBERED,
1112 .procname = "mmap_min_addr",
1113 .data = &mmap_min_addr,
1114 .maxlen = sizeof(unsigned long),
1116 .proc_handler = &proc_doulongvec_minmax,
1121 .ctl_name = CTL_UNNUMBERED,
1122 .procname = "numa_zonelist_order",
1123 .data = &numa_zonelist_order,
1124 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1126 .proc_handler = &numa_zonelist_order_handler,
1127 .strategy = &sysctl_string,
1130 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1131 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1133 .ctl_name = VM_VDSO_ENABLED,
1134 .procname = "vdso_enabled",
1135 .data = &vdso_enabled,
1136 .maxlen = sizeof(vdso_enabled),
1138 .proc_handler = &proc_dointvec,
1139 .strategy = &sysctl_intvec,
1143 #ifdef CONFIG_HIGHMEM
1145 .ctl_name = CTL_UNNUMBERED,
1146 .procname = "highmem_is_dirtyable",
1147 .data = &vm_highmem_is_dirtyable,
1148 .maxlen = sizeof(vm_highmem_is_dirtyable),
1150 .proc_handler = &proc_dointvec_minmax,
1151 .strategy = &sysctl_intvec,
1157 * NOTE: do not add new entries to this table unless you have read
1158 * Documentation/sysctl/ctl_unnumbered.txt
1163 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1164 static struct ctl_table binfmt_misc_table[] = {
1169 static struct ctl_table fs_table[] = {
1171 .ctl_name = FS_NRINODE,
1172 .procname = "inode-nr",
1173 .data = &inodes_stat,
1174 .maxlen = 2*sizeof(int),
1176 .proc_handler = &proc_dointvec,
1179 .ctl_name = FS_STATINODE,
1180 .procname = "inode-state",
1181 .data = &inodes_stat,
1182 .maxlen = 7*sizeof(int),
1184 .proc_handler = &proc_dointvec,
1187 .procname = "file-nr",
1188 .data = &files_stat,
1189 .maxlen = 3*sizeof(int),
1191 .proc_handler = &proc_nr_files,
1194 .ctl_name = FS_MAXFILE,
1195 .procname = "file-max",
1196 .data = &files_stat.max_files,
1197 .maxlen = sizeof(int),
1199 .proc_handler = &proc_dointvec,
1202 .ctl_name = CTL_UNNUMBERED,
1203 .procname = "nr_open",
1204 .data = &sysctl_nr_open,
1205 .maxlen = sizeof(int),
1207 .proc_handler = &proc_dointvec_minmax,
1208 .extra1 = &sysctl_nr_open_min,
1209 .extra2 = &sysctl_nr_open_max,
1212 .ctl_name = FS_DENTRY,
1213 .procname = "dentry-state",
1214 .data = &dentry_stat,
1215 .maxlen = 6*sizeof(int),
1217 .proc_handler = &proc_dointvec,
1220 .ctl_name = FS_OVERFLOWUID,
1221 .procname = "overflowuid",
1222 .data = &fs_overflowuid,
1223 .maxlen = sizeof(int),
1225 .proc_handler = &proc_dointvec_minmax,
1226 .strategy = &sysctl_intvec,
1227 .extra1 = &minolduid,
1228 .extra2 = &maxolduid,
1231 .ctl_name = FS_OVERFLOWGID,
1232 .procname = "overflowgid",
1233 .data = &fs_overflowgid,
1234 .maxlen = sizeof(int),
1236 .proc_handler = &proc_dointvec_minmax,
1237 .strategy = &sysctl_intvec,
1238 .extra1 = &minolduid,
1239 .extra2 = &maxolduid,
1242 .ctl_name = FS_LEASES,
1243 .procname = "leases-enable",
1244 .data = &leases_enable,
1245 .maxlen = sizeof(int),
1247 .proc_handler = &proc_dointvec,
1249 #ifdef CONFIG_DNOTIFY
1251 .ctl_name = FS_DIR_NOTIFY,
1252 .procname = "dir-notify-enable",
1253 .data = &dir_notify_enable,
1254 .maxlen = sizeof(int),
1256 .proc_handler = &proc_dointvec,
1261 .ctl_name = FS_LEASE_TIME,
1262 .procname = "lease-break-time",
1263 .data = &lease_break_time,
1264 .maxlen = sizeof(int),
1266 .proc_handler = &proc_dointvec_minmax,
1267 .strategy = &sysctl_intvec,
1272 .procname = "aio-nr",
1274 .maxlen = sizeof(aio_nr),
1276 .proc_handler = &proc_doulongvec_minmax,
1279 .procname = "aio-max-nr",
1280 .data = &aio_max_nr,
1281 .maxlen = sizeof(aio_max_nr),
1283 .proc_handler = &proc_doulongvec_minmax,
1285 #ifdef CONFIG_INOTIFY_USER
1287 .ctl_name = FS_INOTIFY,
1288 .procname = "inotify",
1290 .child = inotify_table,
1295 .ctl_name = KERN_SETUID_DUMPABLE,
1296 .procname = "suid_dumpable",
1297 .data = &suid_dumpable,
1298 .maxlen = sizeof(int),
1300 .proc_handler = &proc_dointvec,
1302 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1304 .ctl_name = CTL_UNNUMBERED,
1305 .procname = "binfmt_misc",
1307 .child = binfmt_misc_table,
1311 * NOTE: do not add new entries to this table unless you have read
1312 * Documentation/sysctl/ctl_unnumbered.txt
1317 static struct ctl_table debug_table[] = {
1318 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1320 .ctl_name = CTL_UNNUMBERED,
1321 .procname = "exception-trace",
1322 .data = &show_unhandled_signals,
1323 .maxlen = sizeof(int),
1325 .proc_handler = proc_dointvec
1331 static struct ctl_table dev_table[] = {
1335 static DEFINE_SPINLOCK(sysctl_lock);
1337 /* called under sysctl_lock */
1338 static int use_table(struct ctl_table_header *p)
1340 if (unlikely(p->unregistering))
1346 /* called under sysctl_lock */
1347 static void unuse_table(struct ctl_table_header *p)
1350 if (unlikely(p->unregistering))
1351 complete(p->unregistering);
1354 /* called under sysctl_lock, will reacquire if has to wait */
1355 static void start_unregistering(struct ctl_table_header *p)
1358 * if p->used is 0, nobody will ever touch that entry again;
1359 * we'll eliminate all paths to it before dropping sysctl_lock
1361 if (unlikely(p->used)) {
1362 struct completion wait;
1363 init_completion(&wait);
1364 p->unregistering = &wait;
1365 spin_unlock(&sysctl_lock);
1366 wait_for_completion(&wait);
1367 spin_lock(&sysctl_lock);
1370 * do not remove from the list until nobody holds it; walking the
1371 * list in do_sysctl() relies on that.
1373 list_del_init(&p->ctl_entry);
1376 void sysctl_head_finish(struct ctl_table_header *head)
1380 spin_lock(&sysctl_lock);
1382 spin_unlock(&sysctl_lock);
1385 static struct list_head *
1386 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1388 struct list_head *header_list;
1389 header_list = &root->header_list;
1391 header_list = root->lookup(root, namespaces);
1395 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1396 struct ctl_table_header *prev)
1398 struct ctl_table_root *root;
1399 struct list_head *header_list;
1400 struct ctl_table_header *head;
1401 struct list_head *tmp;
1403 spin_lock(&sysctl_lock);
1406 tmp = &prev->ctl_entry;
1410 tmp = &root_table_header.ctl_entry;
1412 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1414 if (!use_table(head))
1416 spin_unlock(&sysctl_lock);
1421 header_list = lookup_header_list(root, namespaces);
1422 if (tmp != header_list)
1426 root = list_entry(root->root_list.next,
1427 struct ctl_table_root, root_list);
1428 if (root == &sysctl_table_root)
1430 header_list = lookup_header_list(root, namespaces);
1431 } while (list_empty(header_list));
1432 tmp = header_list->next;
1435 spin_unlock(&sysctl_lock);
1439 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1441 return __sysctl_head_next(current->nsproxy, prev);
1444 void register_sysctl_root(struct ctl_table_root *root)
1446 spin_lock(&sysctl_lock);
1447 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1448 spin_unlock(&sysctl_lock);
1451 #ifdef CONFIG_SYSCTL_SYSCALL
1452 /* Perform the actual read/write of a sysctl table entry. */
1453 static int do_sysctl_strategy(struct ctl_table_root *root,
1454 struct ctl_table *table,
1455 int __user *name, int nlen,
1456 void __user *oldval, size_t __user *oldlenp,
1457 void __user *newval, size_t newlen)
1465 if (sysctl_perm(root, table, op))
1468 if (table->strategy) {
1469 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1477 /* If there is no strategy routine, or if the strategy returns
1478 * zero, proceed with automatic r/w */
1479 if (table->data && table->maxlen) {
1480 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1488 static int parse_table(int __user *name, int nlen,
1489 void __user *oldval, size_t __user *oldlenp,
1490 void __user *newval, size_t newlen,
1491 struct ctl_table_root *root,
1492 struct ctl_table *table)
1498 if (get_user(n, name))
1500 for ( ; table->ctl_name || table->procname; table++) {
1501 if (!table->ctl_name)
1503 if (n == table->ctl_name) {
1506 if (sysctl_perm(root, table, 001))
1510 table = table->child;
1513 error = do_sysctl_strategy(root, table, name, nlen,
1522 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1523 void __user *newval, size_t newlen)
1525 struct ctl_table_header *head;
1526 int error = -ENOTDIR;
1528 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1532 if (!oldlenp || get_user(old_len, oldlenp))
1536 for (head = sysctl_head_next(NULL); head;
1537 head = sysctl_head_next(head)) {
1538 error = parse_table(name, nlen, oldval, oldlenp,
1540 head->root, head->ctl_table);
1541 if (error != -ENOTDIR) {
1542 sysctl_head_finish(head);
1549 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1551 struct __sysctl_args tmp;
1554 if (copy_from_user(&tmp, args, sizeof(tmp)))
1557 error = deprecated_sysctl_warning(&tmp);
1562 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1563 tmp.newval, tmp.newlen);
1568 #endif /* CONFIG_SYSCTL_SYSCALL */
1571 * sysctl_perm does NOT grant the superuser all rights automatically, because
1572 * some sysctl variables are readonly even to root.
1575 static int test_perm(int mode, int op)
1579 else if (in_egroup_p(0))
1581 if ((mode & op & 0007) == op)
1586 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1591 error = security_sysctl(table, op);
1595 if (root->permissions)
1596 mode = root->permissions(root, current->nsproxy, table);
1600 return test_perm(mode, op);
1603 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1605 for (; table->ctl_name || table->procname; table++) {
1606 table->parent = parent;
1608 sysctl_set_parent(table, table->child);
1612 static __init int sysctl_init(void)
1614 sysctl_set_parent(NULL, root_table);
1615 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1618 err = sysctl_check_table(current->nsproxy, root_table);
1624 core_initcall(sysctl_init);
1627 * __register_sysctl_paths - register a sysctl hierarchy
1628 * @root: List of sysctl headers to register on
1629 * @namespaces: Data to compute which lists of sysctl entries are visible
1630 * @path: The path to the directory the sysctl table is in.
1631 * @table: the top-level table structure
1633 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1634 * array. A completely 0 filled entry terminates the table.
1636 * The members of the &struct ctl_table structure are used as follows:
1638 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1639 * must be unique within that level of sysctl
1641 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1642 * enter a sysctl file
1644 * data - a pointer to data for use by proc_handler
1646 * maxlen - the maximum size in bytes of the data
1648 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1650 * child - a pointer to the child sysctl table if this entry is a directory, or
1653 * proc_handler - the text handler routine (described below)
1655 * strategy - the strategy routine (described below)
1657 * de - for internal use by the sysctl routines
1659 * extra1, extra2 - extra pointers usable by the proc handler routines
1661 * Leaf nodes in the sysctl tree will be represented by a single file
1662 * under /proc; non-leaf nodes will be represented by directories.
1664 * sysctl(2) can automatically manage read and write requests through
1665 * the sysctl table. The data and maxlen fields of the ctl_table
1666 * struct enable minimal validation of the values being written to be
1667 * performed, and the mode field allows minimal authentication.
1669 * More sophisticated management can be enabled by the provision of a
1670 * strategy routine with the table entry. This will be called before
1671 * any automatic read or write of the data is performed.
1673 * The strategy routine may return
1675 * < 0 - Error occurred (error is passed to user process)
1677 * 0 - OK - proceed with automatic read or write.
1679 * > 0 - OK - read or write has been done by the strategy routine, so
1680 * return immediately.
1682 * There must be a proc_handler routine for any terminal nodes
1683 * mirrored under /proc/sys (non-terminals are handled by a built-in
1684 * directory handler). Several default handlers are available to
1685 * cover common cases -
1687 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1688 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1689 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1691 * It is the handler's job to read the input buffer from user memory
1692 * and process it. The handler should return 0 on success.
1694 * This routine returns %NULL on a failure to register, and a pointer
1695 * to the table header on success.
1697 struct ctl_table_header *__register_sysctl_paths(
1698 struct ctl_table_root *root,
1699 struct nsproxy *namespaces,
1700 const struct ctl_path *path, struct ctl_table *table)
1702 struct list_head *header_list;
1703 struct ctl_table_header *header;
1704 struct ctl_table *new, **prevp;
1705 unsigned int n, npath;
1707 /* Count the path components */
1708 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1712 * For each path component, allocate a 2-element ctl_table array.
1713 * The first array element will be filled with the sysctl entry
1714 * for this, the second will be the sentinel (ctl_name == 0).
1716 * We allocate everything in one go so that we don't have to
1717 * worry about freeing additional memory in unregister_sysctl_table.
1719 header = kzalloc(sizeof(struct ctl_table_header) +
1720 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1724 new = (struct ctl_table *) (header + 1);
1726 /* Now connect the dots */
1727 prevp = &header->ctl_table;
1728 for (n = 0; n < npath; ++n, ++path) {
1729 /* Copy the procname */
1730 new->procname = path->procname;
1731 new->ctl_name = path->ctl_name;
1735 prevp = &new->child;
1740 header->ctl_table_arg = table;
1742 INIT_LIST_HEAD(&header->ctl_entry);
1744 header->unregistering = NULL;
1745 header->root = root;
1746 sysctl_set_parent(NULL, header->ctl_table);
1747 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1748 if (sysctl_check_table(namespaces, header->ctl_table)) {
1753 spin_lock(&sysctl_lock);
1754 header_list = lookup_header_list(root, namespaces);
1755 list_add_tail(&header->ctl_entry, header_list);
1756 spin_unlock(&sysctl_lock);
1762 * register_sysctl_table_path - register a sysctl table hierarchy
1763 * @path: The path to the directory the sysctl table is in.
1764 * @table: the top-level table structure
1766 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1767 * array. A completely 0 filled entry terminates the table.
1769 * See __register_sysctl_paths for more details.
1771 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1772 struct ctl_table *table)
1774 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1779 * register_sysctl_table - register a sysctl table hierarchy
1780 * @table: the top-level table structure
1782 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1783 * array. A completely 0 filled entry terminates the table.
1785 * See register_sysctl_paths for more details.
1787 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1789 static const struct ctl_path null_path[] = { {} };
1791 return register_sysctl_paths(null_path, table);
1795 * unregister_sysctl_table - unregister a sysctl table hierarchy
1796 * @header: the header returned from register_sysctl_table
1798 * Unregisters the sysctl table and all children. proc entries may not
1799 * actually be removed until they are no longer used by anyone.
1801 void unregister_sysctl_table(struct ctl_table_header * header)
1808 spin_lock(&sysctl_lock);
1809 start_unregistering(header);
1810 spin_unlock(&sysctl_lock);
1814 #else /* !CONFIG_SYSCTL */
1815 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1820 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1821 struct ctl_table *table)
1826 void unregister_sysctl_table(struct ctl_table_header * table)
1830 #endif /* CONFIG_SYSCTL */
1836 #ifdef CONFIG_PROC_SYSCTL
1838 static int _proc_do_string(void* data, int maxlen, int write,
1839 struct file *filp, void __user *buffer,
1840 size_t *lenp, loff_t *ppos)
1846 if (!data || !maxlen || !*lenp) {
1854 while (len < *lenp) {
1855 if (get_user(c, p++))
1857 if (c == 0 || c == '\n')
1863 if(copy_from_user(data, buffer, len))
1865 ((char *) data)[len] = 0;
1883 if(copy_to_user(buffer, data, len))
1886 if(put_user('\n', ((char __user *) buffer) + len))
1897 * proc_dostring - read a string sysctl
1898 * @table: the sysctl table
1899 * @write: %TRUE if this is a write to the sysctl file
1900 * @filp: the file structure
1901 * @buffer: the user buffer
1902 * @lenp: the size of the user buffer
1903 * @ppos: file position
1905 * Reads/writes a string from/to the user buffer. If the kernel
1906 * buffer provided is not large enough to hold the string, the
1907 * string is truncated. The copied string is %NULL-terminated.
1908 * If the string is being read by the user process, it is copied
1909 * and a newline '\n' is added. It is truncated if the buffer is
1912 * Returns 0 on success.
1914 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1915 void __user *buffer, size_t *lenp, loff_t *ppos)
1917 return _proc_do_string(table->data, table->maxlen, write, filp,
1918 buffer, lenp, ppos);
1922 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1924 int write, void *data)
1927 *valp = *negp ? -*lvalp : *lvalp;
1932 *lvalp = (unsigned long)-val;
1935 *lvalp = (unsigned long)val;
1941 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1942 int write, struct file *filp, void __user *buffer,
1943 size_t *lenp, loff_t *ppos,
1944 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1945 int write, void *data),
1948 #define TMPBUFLEN 21
1949 int *i, vleft, first=1, neg, val;
1953 char buf[TMPBUFLEN], *p;
1954 char __user *s = buffer;
1956 if (!tbl_data || !table->maxlen || !*lenp ||
1957 (*ppos && !write)) {
1962 i = (int *) tbl_data;
1963 vleft = table->maxlen / sizeof(*i);
1967 conv = do_proc_dointvec_conv;
1969 for (; left && vleft--; i++, first=0) {
1984 if (len > sizeof(buf) - 1)
1985 len = sizeof(buf) - 1;
1986 if (copy_from_user(buf, s, len))
1990 if (*p == '-' && left > 1) {
1994 if (*p < '0' || *p > '9')
1997 lval = simple_strtoul(p, &p, 0);
2000 if ((len < left) && *p && !isspace(*p))
2007 if (conv(&neg, &lval, i, 1, data))
2014 if (conv(&neg, &lval, i, 0, data))
2017 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2021 if(copy_to_user(s, buf, len))
2028 if (!write && !first && left) {
2029 if(put_user('\n', s))
2036 if (get_user(c, s++))
2051 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2052 void __user *buffer, size_t *lenp, loff_t *ppos,
2053 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2054 int write, void *data),
2057 return __do_proc_dointvec(table->data, table, write, filp,
2058 buffer, lenp, ppos, conv, data);
2062 * proc_dointvec - read a vector of integers
2063 * @table: the sysctl table
2064 * @write: %TRUE if this is a write to the sysctl file
2065 * @filp: the file structure
2066 * @buffer: the user buffer
2067 * @lenp: the size of the user buffer
2068 * @ppos: file position
2070 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2071 * values from/to the user buffer, treated as an ASCII string.
2073 * Returns 0 on success.
2075 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2076 void __user *buffer, size_t *lenp, loff_t *ppos)
2078 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2086 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2088 int write, void *data)
2090 int op = *(int *)data;
2092 int val = *negp ? -*lvalp : *lvalp;
2094 case OP_SET: *valp = val; break;
2095 case OP_AND: *valp &= val; break;
2096 case OP_OR: *valp |= val; break;
2102 *lvalp = (unsigned long)-val;
2105 *lvalp = (unsigned long)val;
2112 * Taint values can only be increased
2114 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2115 void __user *buffer, size_t *lenp, loff_t *ppos)
2119 if (write && !capable(CAP_SYS_ADMIN))
2123 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2124 do_proc_dointvec_bset_conv,&op);
2127 struct do_proc_dointvec_minmax_conv_param {
2132 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2134 int write, void *data)
2136 struct do_proc_dointvec_minmax_conv_param *param = data;
2138 int val = *negp ? -*lvalp : *lvalp;
2139 if ((param->min && *param->min > val) ||
2140 (param->max && *param->max < val))
2147 *lvalp = (unsigned long)-val;
2150 *lvalp = (unsigned long)val;
2157 * proc_dointvec_minmax - read a vector of integers with min/max values
2158 * @table: the sysctl table
2159 * @write: %TRUE if this is a write to the sysctl file
2160 * @filp: the file structure
2161 * @buffer: the user buffer
2162 * @lenp: the size of the user buffer
2163 * @ppos: file position
2165 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2166 * values from/to the user buffer, treated as an ASCII string.
2168 * This routine will ensure the values are within the range specified by
2169 * table->extra1 (min) and table->extra2 (max).
2171 * Returns 0 on success.
2173 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2174 void __user *buffer, size_t *lenp, loff_t *ppos)
2176 struct do_proc_dointvec_minmax_conv_param param = {
2177 .min = (int *) table->extra1,
2178 .max = (int *) table->extra2,
2180 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2181 do_proc_dointvec_minmax_conv, ¶m);
2184 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2186 void __user *buffer,
2187 size_t *lenp, loff_t *ppos,
2188 unsigned long convmul,
2189 unsigned long convdiv)
2191 #define TMPBUFLEN 21
2192 unsigned long *i, *min, *max, val;
2193 int vleft, first=1, neg;
2195 char buf[TMPBUFLEN], *p;
2196 char __user *s = buffer;
2198 if (!data || !table->maxlen || !*lenp ||
2199 (*ppos && !write)) {
2204 i = (unsigned long *) data;
2205 min = (unsigned long *) table->extra1;
2206 max = (unsigned long *) table->extra2;
2207 vleft = table->maxlen / sizeof(unsigned long);
2210 for (; left && vleft--; i++, min++, max++, first=0) {
2225 if (len > TMPBUFLEN-1)
2227 if (copy_from_user(buf, s, len))
2231 if (*p == '-' && left > 1) {
2235 if (*p < '0' || *p > '9')
2237 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2239 if ((len < left) && *p && !isspace(*p))
2248 if ((min && val < *min) || (max && val > *max))
2255 sprintf(p, "%lu", convdiv * (*i) / convmul);
2259 if(copy_to_user(s, buf, len))
2266 if (!write && !first && left) {
2267 if(put_user('\n', s))
2274 if (get_user(c, s++))
2289 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2291 void __user *buffer,
2292 size_t *lenp, loff_t *ppos,
2293 unsigned long convmul,
2294 unsigned long convdiv)
2296 return __do_proc_doulongvec_minmax(table->data, table, write,
2297 filp, buffer, lenp, ppos, convmul, convdiv);
2301 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2302 * @table: the sysctl table
2303 * @write: %TRUE if this is a write to the sysctl file
2304 * @filp: the file structure
2305 * @buffer: the user buffer
2306 * @lenp: the size of the user buffer
2307 * @ppos: file position
2309 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2310 * values from/to the user buffer, treated as an ASCII string.
2312 * This routine will ensure the values are within the range specified by
2313 * table->extra1 (min) and table->extra2 (max).
2315 * Returns 0 on success.
2317 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2318 void __user *buffer, size_t *lenp, loff_t *ppos)
2320 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2324 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2325 * @table: the sysctl table
2326 * @write: %TRUE if this is a write to the sysctl file
2327 * @filp: the file structure
2328 * @buffer: the user buffer
2329 * @lenp: the size of the user buffer
2330 * @ppos: file position
2332 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2333 * values from/to the user buffer, treated as an ASCII string. The values
2334 * are treated as milliseconds, and converted to jiffies when they are stored.
2336 * This routine will ensure the values are within the range specified by
2337 * table->extra1 (min) and table->extra2 (max).
2339 * Returns 0 on success.
2341 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2343 void __user *buffer,
2344 size_t *lenp, loff_t *ppos)
2346 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2347 lenp, ppos, HZ, 1000l);
2351 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2353 int write, void *data)
2356 if (*lvalp > LONG_MAX / HZ)
2358 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2364 lval = (unsigned long)-val;
2367 lval = (unsigned long)val;
2374 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2376 int write, void *data)
2379 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2381 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2387 lval = (unsigned long)-val;
2390 lval = (unsigned long)val;
2392 *lvalp = jiffies_to_clock_t(lval);
2397 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2399 int write, void *data)
2402 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2408 lval = (unsigned long)-val;
2411 lval = (unsigned long)val;
2413 *lvalp = jiffies_to_msecs(lval);
2419 * proc_dointvec_jiffies - read a vector of integers as seconds
2420 * @table: the sysctl table
2421 * @write: %TRUE if this is a write to the sysctl file
2422 * @filp: the file structure
2423 * @buffer: the user buffer
2424 * @lenp: the size of the user buffer
2425 * @ppos: file position
2427 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2428 * values from/to the user buffer, treated as an ASCII string.
2429 * The values read are assumed to be in seconds, and are converted into
2432 * Returns 0 on success.
2434 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2435 void __user *buffer, size_t *lenp, loff_t *ppos)
2437 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2438 do_proc_dointvec_jiffies_conv,NULL);
2442 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2443 * @table: the sysctl table
2444 * @write: %TRUE if this is a write to the sysctl file
2445 * @filp: the file structure
2446 * @buffer: the user buffer
2447 * @lenp: the size of the user buffer
2448 * @ppos: pointer to the file position
2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2451 * values from/to the user buffer, treated as an ASCII string.
2452 * The values read are assumed to be in 1/USER_HZ seconds, and
2453 * are converted into jiffies.
2455 * Returns 0 on success.
2457 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2458 void __user *buffer, size_t *lenp, loff_t *ppos)
2460 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2461 do_proc_dointvec_userhz_jiffies_conv,NULL);
2465 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2466 * @table: the sysctl table
2467 * @write: %TRUE if this is a write to the sysctl file
2468 * @filp: the file structure
2469 * @buffer: the user buffer
2470 * @lenp: the size of the user buffer
2471 * @ppos: file position
2472 * @ppos: the current position in the file
2474 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2475 * values from/to the user buffer, treated as an ASCII string.
2476 * The values read are assumed to be in 1/1000 seconds, and
2477 * are converted into jiffies.
2479 * Returns 0 on success.
2481 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2482 void __user *buffer, size_t *lenp, loff_t *ppos)
2484 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2485 do_proc_dointvec_ms_jiffies_conv, NULL);
2488 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2489 void __user *buffer, size_t *lenp, loff_t *ppos)
2491 struct pid *new_pid;
2495 tmp = pid_vnr(cad_pid);
2497 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2498 lenp, ppos, NULL, NULL);
2502 new_pid = find_get_pid(tmp);
2506 put_pid(xchg(&cad_pid, new_pid));
2510 #else /* CONFIG_PROC_FS */
2512 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2513 void __user *buffer, size_t *lenp, loff_t *ppos)
2518 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2519 void __user *buffer, size_t *lenp, loff_t *ppos)
2524 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2525 void __user *buffer, size_t *lenp, loff_t *ppos)
2530 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2531 void __user *buffer, size_t *lenp, loff_t *ppos)
2536 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2537 void __user *buffer, size_t *lenp, loff_t *ppos)
2542 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2543 void __user *buffer, size_t *lenp, loff_t *ppos)
2548 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2549 void __user *buffer, size_t *lenp, loff_t *ppos)
2554 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2556 void __user *buffer,
2557 size_t *lenp, loff_t *ppos)
2563 #endif /* CONFIG_PROC_FS */
2566 #ifdef CONFIG_SYSCTL_SYSCALL
2568 * General sysctl support routines
2571 /* The generic sysctl data routine (used if no strategy routine supplied) */
2572 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2573 void __user *oldval, size_t __user *oldlenp,
2574 void __user *newval, size_t newlen)
2578 /* Get out of I don't have a variable */
2579 if (!table->data || !table->maxlen)
2582 if (oldval && oldlenp) {
2583 if (get_user(len, oldlenp))
2586 if (len > table->maxlen)
2587 len = table->maxlen;
2588 if (copy_to_user(oldval, table->data, len))
2590 if (put_user(len, oldlenp))
2595 if (newval && newlen) {
2596 if (newlen > table->maxlen)
2597 newlen = table->maxlen;
2599 if (copy_from_user(table->data, newval, newlen))
2605 /* The generic string strategy routine: */
2606 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2607 void __user *oldval, size_t __user *oldlenp,
2608 void __user *newval, size_t newlen)
2610 if (!table->data || !table->maxlen)
2613 if (oldval && oldlenp) {
2615 if (get_user(bufsize, oldlenp))
2618 size_t len = strlen(table->data), copied;
2620 /* This shouldn't trigger for a well-formed sysctl */
2621 if (len > table->maxlen)
2622 len = table->maxlen;
2624 /* Copy up to a max of bufsize-1 bytes of the string */
2625 copied = (len >= bufsize) ? bufsize - 1 : len;
2627 if (copy_to_user(oldval, table->data, copied) ||
2628 put_user(0, (char __user *)(oldval + copied)))
2630 if (put_user(len, oldlenp))
2634 if (newval && newlen) {
2635 size_t len = newlen;
2636 if (len > table->maxlen)
2637 len = table->maxlen;
2638 if(copy_from_user(table->data, newval, len))
2640 if (len == table->maxlen)
2642 ((char *) table->data)[len] = 0;
2648 * This function makes sure that all of the integers in the vector
2649 * are between the minimum and maximum values given in the arrays
2650 * table->extra1 and table->extra2, respectively.
2652 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2653 void __user *oldval, size_t __user *oldlenp,
2654 void __user *newval, size_t newlen)
2657 if (newval && newlen) {
2658 int __user *vec = (int __user *) newval;
2659 int *min = (int *) table->extra1;
2660 int *max = (int *) table->extra2;
2664 if (newlen % sizeof(int) != 0)
2667 if (!table->extra1 && !table->extra2)
2670 if (newlen > table->maxlen)
2671 newlen = table->maxlen;
2672 length = newlen / sizeof(int);
2674 for (i = 0; i < length; i++) {
2676 if (get_user(value, vec + i))
2678 if (min && value < min[i])
2680 if (max && value > max[i])
2687 /* Strategy function to convert jiffies to seconds */
2688 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2689 void __user *oldval, size_t __user *oldlenp,
2690 void __user *newval, size_t newlen)
2692 if (oldval && oldlenp) {
2695 if (get_user(olen, oldlenp))
2700 if (olen < sizeof(int))
2703 val = *(int *)(table->data) / HZ;
2704 if (put_user(val, (int __user *)oldval))
2706 if (put_user(sizeof(int), oldlenp))
2710 if (newval && newlen) {
2712 if (newlen != sizeof(int))
2714 if (get_user(new, (int __user *)newval))
2716 *(int *)(table->data) = new*HZ;
2721 /* Strategy function to convert jiffies to seconds */
2722 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2723 void __user *oldval, size_t __user *oldlenp,
2724 void __user *newval, size_t newlen)
2726 if (oldval && oldlenp) {
2729 if (get_user(olen, oldlenp))
2734 if (olen < sizeof(int))
2737 val = jiffies_to_msecs(*(int *)(table->data));
2738 if (put_user(val, (int __user *)oldval))
2740 if (put_user(sizeof(int), oldlenp))
2744 if (newval && newlen) {
2746 if (newlen != sizeof(int))
2748 if (get_user(new, (int __user *)newval))
2750 *(int *)(table->data) = msecs_to_jiffies(new);
2757 #else /* CONFIG_SYSCTL_SYSCALL */
2760 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2762 struct __sysctl_args tmp;
2765 if (copy_from_user(&tmp, args, sizeof(tmp)))
2768 error = deprecated_sysctl_warning(&tmp);
2770 /* If no error reading the parameters then just -ENOSYS ... */
2777 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2778 void __user *oldval, size_t __user *oldlenp,
2779 void __user *newval, size_t newlen)
2784 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2785 void __user *oldval, size_t __user *oldlenp,
2786 void __user *newval, size_t newlen)
2791 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2792 void __user *oldval, size_t __user *oldlenp,
2793 void __user *newval, size_t newlen)
2798 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2799 void __user *oldval, size_t __user *oldlenp,
2800 void __user *newval, size_t newlen)
2805 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2806 void __user *oldval, size_t __user *oldlenp,
2807 void __user *newval, size_t newlen)
2812 #endif /* CONFIG_SYSCTL_SYSCALL */
2814 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2816 static int msg_count;
2817 int name[CTL_MAXNAME];
2820 /* Check args->nlen. */
2821 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2824 /* Read in the sysctl name for better debug message logging */
2825 for (i = 0; i < args->nlen; i++)
2826 if (get_user(name[i], args->name + i))
2829 /* Ignore accesses to kernel.version */
2830 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2833 if (msg_count < 5) {
2836 "warning: process `%s' used the deprecated sysctl "
2837 "system call with ", current->comm);
2838 for (i = 0; i < args->nlen; i++)
2839 printk("%d.", name[i]);
2846 * No sense putting this after each symbol definition, twice,
2847 * exception granted :-)
2849 EXPORT_SYMBOL(proc_dointvec);
2850 EXPORT_SYMBOL(proc_dointvec_jiffies);
2851 EXPORT_SYMBOL(proc_dointvec_minmax);
2852 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2853 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2854 EXPORT_SYMBOL(proc_dostring);
2855 EXPORT_SYMBOL(proc_doulongvec_minmax);
2856 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2857 EXPORT_SYMBOL(register_sysctl_table);
2858 EXPORT_SYMBOL(register_sysctl_paths);
2859 EXPORT_SYMBOL(sysctl_intvec);
2860 EXPORT_SYMBOL(sysctl_jiffies);
2861 EXPORT_SYMBOL(sysctl_ms_jiffies);
2862 EXPORT_SYMBOL(sysctl_string);
2863 EXPORT_SYMBOL(sysctl_data);
2864 EXPORT_SYMBOL(unregister_sysctl_table);