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
;
85 /* Constants used for minimum and maximum */
86 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
90 #ifdef CONFIG_DETECT_SOFTLOCKUP
91 static int sixty
= 60;
99 static int one_hundred
= 100;
101 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
102 static int maxolduid
= 65535;
103 static int minolduid
;
104 static int min_percpu_pagelist_fract
= 8;
106 static int ngroups_max
= NGROUPS_MAX
;
109 extern char modprobe_path
[];
111 #ifdef CONFIG_CHR_DEV_SG
112 extern int sg_big_buff
;
116 extern char reboot_command
[];
117 extern int stop_a_enabled
;
118 extern int scons_pwroff
;
122 extern int pwrsw_enabled
;
123 extern int unaligned_enabled
;
127 #ifdef CONFIG_MATHEMU
128 extern int sysctl_ieee_emulation_warnings
;
130 extern int sysctl_userprocess_debug
;
131 extern int spin_retry
;
134 extern int sysctl_hz_timer
;
136 #ifdef CONFIG_BSD_PROCESS_ACCT
137 extern int acct_parm
[];
141 extern int no_unaligned_warning
;
144 #ifdef CONFIG_RT_MUTEXES
145 extern int max_lock_depth
;
148 #ifdef CONFIG_PROC_SYSCTL
149 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
150 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
151 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
152 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
155 static struct ctl_table root_table
[];
156 static struct ctl_table_root sysctl_table_root
;
157 static struct ctl_table_header root_table_header
= {
158 .ctl_table
= root_table
,
159 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.header_list
),
160 .root
= &sysctl_table_root
,
162 static struct ctl_table_root sysctl_table_root
= {
163 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
164 .header_list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
167 static struct ctl_table kern_table
[];
168 static struct ctl_table vm_table
[];
169 static struct ctl_table fs_table
[];
170 static struct ctl_table debug_table
[];
171 static struct ctl_table dev_table
[];
172 extern struct ctl_table random_table
[];
173 #ifdef CONFIG_INOTIFY_USER
174 extern struct ctl_table inotify_table
[];
177 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
178 int sysctl_legacy_va_layout
;
181 extern int prove_locking
;
182 extern int lock_stat
;
184 /* The default sysctl tables: */
186 static struct ctl_table root_table
[] = {
188 .ctl_name
= CTL_KERN
,
189 .procname
= "kernel",
206 .ctl_name
= CTL_DEBUG
,
209 .child
= debug_table
,
218 * NOTE: do not add new entries to this table unless you have read
219 * Documentation/sysctl/ctl_unnumbered.txt
224 #ifdef CONFIG_SCHED_DEBUG
225 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
226 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
227 static int min_wakeup_granularity_ns
; /* 0 usecs */
228 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
231 static struct ctl_table kern_table
[] = {
232 #ifdef CONFIG_SCHED_DEBUG
234 .ctl_name
= CTL_UNNUMBERED
,
235 .procname
= "sched_min_granularity_ns",
236 .data
= &sysctl_sched_min_granularity
,
237 .maxlen
= sizeof(unsigned int),
239 .proc_handler
= &sched_nr_latency_handler
,
240 .strategy
= &sysctl_intvec
,
241 .extra1
= &min_sched_granularity_ns
,
242 .extra2
= &max_sched_granularity_ns
,
245 .ctl_name
= CTL_UNNUMBERED
,
246 .procname
= "sched_latency_ns",
247 .data
= &sysctl_sched_latency
,
248 .maxlen
= sizeof(unsigned int),
250 .proc_handler
= &sched_nr_latency_handler
,
251 .strategy
= &sysctl_intvec
,
252 .extra1
= &min_sched_granularity_ns
,
253 .extra2
= &max_sched_granularity_ns
,
256 .ctl_name
= CTL_UNNUMBERED
,
257 .procname
= "sched_wakeup_granularity_ns",
258 .data
= &sysctl_sched_wakeup_granularity
,
259 .maxlen
= sizeof(unsigned int),
261 .proc_handler
= &proc_dointvec_minmax
,
262 .strategy
= &sysctl_intvec
,
263 .extra1
= &min_wakeup_granularity_ns
,
264 .extra2
= &max_wakeup_granularity_ns
,
267 .ctl_name
= CTL_UNNUMBERED
,
268 .procname
= "sched_child_runs_first",
269 .data
= &sysctl_sched_child_runs_first
,
270 .maxlen
= sizeof(unsigned int),
272 .proc_handler
= &proc_dointvec
,
275 .ctl_name
= CTL_UNNUMBERED
,
276 .procname
= "sched_features",
277 .data
= &sysctl_sched_features
,
278 .maxlen
= sizeof(unsigned int),
280 .proc_handler
= &proc_dointvec
,
283 .ctl_name
= CTL_UNNUMBERED
,
284 .procname
= "sched_migration_cost",
285 .data
= &sysctl_sched_migration_cost
,
286 .maxlen
= sizeof(unsigned int),
288 .proc_handler
= &proc_dointvec
,
291 .ctl_name
= CTL_UNNUMBERED
,
292 .procname
= "sched_nr_migrate",
293 .data
= &sysctl_sched_nr_migrate
,
294 .maxlen
= sizeof(unsigned int),
296 .proc_handler
= &proc_dointvec
,
300 .ctl_name
= CTL_UNNUMBERED
,
301 .procname
= "sched_rt_period_us",
302 .data
= &sysctl_sched_rt_period
,
303 .maxlen
= sizeof(unsigned int),
305 .proc_handler
= &sched_rt_handler
,
308 .ctl_name
= CTL_UNNUMBERED
,
309 .procname
= "sched_rt_runtime_us",
310 .data
= &sysctl_sched_rt_runtime
,
311 .maxlen
= sizeof(int),
313 .proc_handler
= &sched_rt_handler
,
316 .ctl_name
= CTL_UNNUMBERED
,
317 .procname
= "sched_compat_yield",
318 .data
= &sysctl_sched_compat_yield
,
319 .maxlen
= sizeof(unsigned int),
321 .proc_handler
= &proc_dointvec
,
323 #ifdef CONFIG_PROVE_LOCKING
325 .ctl_name
= CTL_UNNUMBERED
,
326 .procname
= "prove_locking",
327 .data
= &prove_locking
,
328 .maxlen
= sizeof(int),
330 .proc_handler
= &proc_dointvec
,
333 #ifdef CONFIG_LOCK_STAT
335 .ctl_name
= CTL_UNNUMBERED
,
336 .procname
= "lock_stat",
338 .maxlen
= sizeof(int),
340 .proc_handler
= &proc_dointvec
,
344 .ctl_name
= KERN_PANIC
,
346 .data
= &panic_timeout
,
347 .maxlen
= sizeof(int),
349 .proc_handler
= &proc_dointvec
,
352 .ctl_name
= KERN_CORE_USES_PID
,
353 .procname
= "core_uses_pid",
354 .data
= &core_uses_pid
,
355 .maxlen
= sizeof(int),
357 .proc_handler
= &proc_dointvec
,
360 .ctl_name
= KERN_CORE_PATTERN
,
361 .procname
= "core_pattern",
362 .data
= core_pattern
,
363 .maxlen
= CORENAME_MAX_SIZE
,
365 .proc_handler
= &proc_dostring
,
366 .strategy
= &sysctl_string
,
368 #ifdef CONFIG_PROC_SYSCTL
370 .procname
= "tainted",
372 .maxlen
= sizeof(int),
374 .proc_handler
= &proc_dointvec_taint
,
377 #ifdef CONFIG_LATENCYTOP
379 .procname
= "latencytop",
380 .data
= &latencytop_enabled
,
381 .maxlen
= sizeof(int),
383 .proc_handler
= &proc_dointvec
,
386 #ifdef CONFIG_BLK_DEV_INITRD
388 .ctl_name
= KERN_REALROOTDEV
,
389 .procname
= "real-root-dev",
390 .data
= &real_root_dev
,
391 .maxlen
= sizeof(int),
393 .proc_handler
= &proc_dointvec
,
397 .ctl_name
= CTL_UNNUMBERED
,
398 .procname
= "print-fatal-signals",
399 .data
= &print_fatal_signals
,
400 .maxlen
= sizeof(int),
402 .proc_handler
= &proc_dointvec
,
406 .ctl_name
= KERN_SPARC_REBOOT
,
407 .procname
= "reboot-cmd",
408 .data
= reboot_command
,
411 .proc_handler
= &proc_dostring
,
412 .strategy
= &sysctl_string
,
415 .ctl_name
= KERN_SPARC_STOP_A
,
416 .procname
= "stop-a",
417 .data
= &stop_a_enabled
,
418 .maxlen
= sizeof (int),
420 .proc_handler
= &proc_dointvec
,
423 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
424 .procname
= "scons-poweroff",
425 .data
= &scons_pwroff
,
426 .maxlen
= sizeof (int),
428 .proc_handler
= &proc_dointvec
,
433 .ctl_name
= KERN_HPPA_PWRSW
,
434 .procname
= "soft-power",
435 .data
= &pwrsw_enabled
,
436 .maxlen
= sizeof (int),
438 .proc_handler
= &proc_dointvec
,
441 .ctl_name
= KERN_HPPA_UNALIGNED
,
442 .procname
= "unaligned-trap",
443 .data
= &unaligned_enabled
,
444 .maxlen
= sizeof (int),
446 .proc_handler
= &proc_dointvec
,
450 .ctl_name
= KERN_CTLALTDEL
,
451 .procname
= "ctrl-alt-del",
453 .maxlen
= sizeof(int),
455 .proc_handler
= &proc_dointvec
,
459 .ctl_name
= KERN_MODPROBE
,
460 .procname
= "modprobe",
461 .data
= &modprobe_path
,
462 .maxlen
= KMOD_PATH_LEN
,
464 .proc_handler
= &proc_dostring
,
465 .strategy
= &sysctl_string
,
468 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
470 .ctl_name
= KERN_HOTPLUG
,
471 .procname
= "hotplug",
472 .data
= &uevent_helper
,
473 .maxlen
= UEVENT_HELPER_PATH_LEN
,
475 .proc_handler
= &proc_dostring
,
476 .strategy
= &sysctl_string
,
479 #ifdef CONFIG_CHR_DEV_SG
481 .ctl_name
= KERN_SG_BIG_BUFF
,
482 .procname
= "sg-big-buff",
483 .data
= &sg_big_buff
,
484 .maxlen
= sizeof (int),
486 .proc_handler
= &proc_dointvec
,
489 #ifdef CONFIG_BSD_PROCESS_ACCT
491 .ctl_name
= KERN_ACCT
,
494 .maxlen
= 3*sizeof(int),
496 .proc_handler
= &proc_dointvec
,
499 #ifdef CONFIG_MAGIC_SYSRQ
501 .ctl_name
= KERN_SYSRQ
,
503 .data
= &__sysrq_enabled
,
504 .maxlen
= sizeof (int),
506 .proc_handler
= &proc_dointvec
,
509 #ifdef CONFIG_PROC_SYSCTL
511 .procname
= "cad_pid",
513 .maxlen
= sizeof (int),
515 .proc_handler
= &proc_do_cad_pid
,
519 .ctl_name
= KERN_MAX_THREADS
,
520 .procname
= "threads-max",
521 .data
= &max_threads
,
522 .maxlen
= sizeof(int),
524 .proc_handler
= &proc_dointvec
,
527 .ctl_name
= KERN_RANDOM
,
528 .procname
= "random",
530 .child
= random_table
,
533 .ctl_name
= KERN_OVERFLOWUID
,
534 .procname
= "overflowuid",
535 .data
= &overflowuid
,
536 .maxlen
= sizeof(int),
538 .proc_handler
= &proc_dointvec_minmax
,
539 .strategy
= &sysctl_intvec
,
540 .extra1
= &minolduid
,
541 .extra2
= &maxolduid
,
544 .ctl_name
= KERN_OVERFLOWGID
,
545 .procname
= "overflowgid",
546 .data
= &overflowgid
,
547 .maxlen
= sizeof(int),
549 .proc_handler
= &proc_dointvec_minmax
,
550 .strategy
= &sysctl_intvec
,
551 .extra1
= &minolduid
,
552 .extra2
= &maxolduid
,
555 #ifdef CONFIG_MATHEMU
557 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
558 .procname
= "ieee_emulation_warnings",
559 .data
= &sysctl_ieee_emulation_warnings
,
560 .maxlen
= sizeof(int),
562 .proc_handler
= &proc_dointvec
,
565 #ifdef CONFIG_NO_IDLE_HZ
567 .ctl_name
= KERN_HZ_TIMER
,
568 .procname
= "hz_timer",
569 .data
= &sysctl_hz_timer
,
570 .maxlen
= sizeof(int),
572 .proc_handler
= &proc_dointvec
,
576 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
577 .procname
= "userprocess_debug",
578 .data
= &sysctl_userprocess_debug
,
579 .maxlen
= sizeof(int),
581 .proc_handler
= &proc_dointvec
,
585 .ctl_name
= KERN_PIDMAX
,
586 .procname
= "pid_max",
588 .maxlen
= sizeof (int),
590 .proc_handler
= &proc_dointvec_minmax
,
591 .strategy
= sysctl_intvec
,
592 .extra1
= &pid_max_min
,
593 .extra2
= &pid_max_max
,
596 .ctl_name
= KERN_PANIC_ON_OOPS
,
597 .procname
= "panic_on_oops",
598 .data
= &panic_on_oops
,
599 .maxlen
= sizeof(int),
601 .proc_handler
= &proc_dointvec
,
603 #if defined CONFIG_PRINTK
605 .ctl_name
= KERN_PRINTK
,
606 .procname
= "printk",
607 .data
= &console_loglevel
,
608 .maxlen
= 4*sizeof(int),
610 .proc_handler
= &proc_dointvec
,
613 .ctl_name
= KERN_PRINTK_RATELIMIT
,
614 .procname
= "printk_ratelimit",
615 .data
= &printk_ratelimit_jiffies
,
616 .maxlen
= sizeof(int),
618 .proc_handler
= &proc_dointvec_jiffies
,
619 .strategy
= &sysctl_jiffies
,
622 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
623 .procname
= "printk_ratelimit_burst",
624 .data
= &printk_ratelimit_burst
,
625 .maxlen
= sizeof(int),
627 .proc_handler
= &proc_dointvec
,
631 .ctl_name
= KERN_NGROUPS_MAX
,
632 .procname
= "ngroups_max",
633 .data
= &ngroups_max
,
634 .maxlen
= sizeof (int),
636 .proc_handler
= &proc_dointvec
,
638 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
640 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
641 .procname
= "unknown_nmi_panic",
642 .data
= &unknown_nmi_panic
,
643 .maxlen
= sizeof (int),
645 .proc_handler
= &proc_dointvec
,
648 .procname
= "nmi_watchdog",
649 .data
= &nmi_watchdog_enabled
,
650 .maxlen
= sizeof (int),
652 .proc_handler
= &proc_nmi_enabled
,
655 #if defined(CONFIG_X86)
657 .ctl_name
= KERN_PANIC_ON_NMI
,
658 .procname
= "panic_on_unrecovered_nmi",
659 .data
= &panic_on_unrecovered_nmi
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= &proc_dointvec
,
665 .ctl_name
= KERN_BOOTLOADER_TYPE
,
666 .procname
= "bootloader_type",
667 .data
= &bootloader_type
,
668 .maxlen
= sizeof (int),
670 .proc_handler
= &proc_dointvec
,
673 .ctl_name
= CTL_UNNUMBERED
,
674 .procname
= "kstack_depth_to_print",
675 .data
= &kstack_depth_to_print
,
676 .maxlen
= sizeof(int),
678 .proc_handler
= &proc_dointvec
,
681 .ctl_name
= CTL_UNNUMBERED
,
682 .procname
= "io_delay_type",
683 .data
= &io_delay_type
,
684 .maxlen
= sizeof(int),
686 .proc_handler
= &proc_dointvec
,
689 #if defined(CONFIG_MMU)
691 .ctl_name
= KERN_RANDOMIZE
,
692 .procname
= "randomize_va_space",
693 .data
= &randomize_va_space
,
694 .maxlen
= sizeof(int),
696 .proc_handler
= &proc_dointvec
,
699 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
701 .ctl_name
= KERN_SPIN_RETRY
,
702 .procname
= "spin_retry",
704 .maxlen
= sizeof (int),
706 .proc_handler
= &proc_dointvec
,
709 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
711 .procname
= "acpi_video_flags",
712 .data
= &acpi_realmode_flags
,
713 .maxlen
= sizeof (unsigned long),
715 .proc_handler
= &proc_doulongvec_minmax
,
720 .ctl_name
= KERN_IA64_UNALIGNED
,
721 .procname
= "ignore-unaligned-usertrap",
722 .data
= &no_unaligned_warning
,
723 .maxlen
= sizeof (int),
725 .proc_handler
= &proc_dointvec
,
728 #ifdef CONFIG_DETECT_SOFTLOCKUP
730 .ctl_name
= CTL_UNNUMBERED
,
731 .procname
= "softlockup_thresh",
732 .data
= &softlockup_thresh
,
733 .maxlen
= sizeof(unsigned long),
735 .proc_handler
= &proc_doulongvec_minmax
,
736 .strategy
= &sysctl_intvec
,
741 .ctl_name
= CTL_UNNUMBERED
,
742 .procname
= "hung_task_check_count",
743 .data
= &sysctl_hung_task_check_count
,
744 .maxlen
= sizeof(unsigned long),
746 .proc_handler
= &proc_doulongvec_minmax
,
747 .strategy
= &sysctl_intvec
,
750 .ctl_name
= CTL_UNNUMBERED
,
751 .procname
= "hung_task_timeout_secs",
752 .data
= &sysctl_hung_task_timeout_secs
,
753 .maxlen
= sizeof(unsigned long),
755 .proc_handler
= &proc_doulongvec_minmax
,
756 .strategy
= &sysctl_intvec
,
759 .ctl_name
= CTL_UNNUMBERED
,
760 .procname
= "hung_task_warnings",
761 .data
= &sysctl_hung_task_warnings
,
762 .maxlen
= sizeof(unsigned long),
764 .proc_handler
= &proc_doulongvec_minmax
,
765 .strategy
= &sysctl_intvec
,
770 .ctl_name
= KERN_COMPAT_LOG
,
771 .procname
= "compat-log",
773 .maxlen
= sizeof (int),
775 .proc_handler
= &proc_dointvec
,
778 #ifdef CONFIG_RT_MUTEXES
780 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
781 .procname
= "max_lock_depth",
782 .data
= &max_lock_depth
,
783 .maxlen
= sizeof(int),
785 .proc_handler
= &proc_dointvec
,
788 #ifdef CONFIG_PROC_FS
790 .ctl_name
= CTL_UNNUMBERED
,
791 .procname
= "maps_protect",
792 .data
= &maps_protect
,
793 .maxlen
= sizeof(int),
795 .proc_handler
= &proc_dointvec
,
799 .ctl_name
= CTL_UNNUMBERED
,
800 .procname
= "poweroff_cmd",
801 .data
= &poweroff_cmd
,
802 .maxlen
= POWEROFF_CMD_PATH_LEN
,
804 .proc_handler
= &proc_dostring
,
805 .strategy
= &sysctl_string
,
809 .ctl_name
= CTL_UNNUMBERED
,
812 .child
= key_sysctls
,
816 * NOTE: do not add new entries to this table unless you have read
817 * Documentation/sysctl/ctl_unnumbered.txt
822 static struct ctl_table vm_table
[] = {
824 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
825 .procname
= "overcommit_memory",
826 .data
= &sysctl_overcommit_memory
,
827 .maxlen
= sizeof(sysctl_overcommit_memory
),
829 .proc_handler
= &proc_dointvec
,
832 .ctl_name
= VM_PANIC_ON_OOM
,
833 .procname
= "panic_on_oom",
834 .data
= &sysctl_panic_on_oom
,
835 .maxlen
= sizeof(sysctl_panic_on_oom
),
837 .proc_handler
= &proc_dointvec
,
840 .ctl_name
= CTL_UNNUMBERED
,
841 .procname
= "oom_kill_allocating_task",
842 .data
= &sysctl_oom_kill_allocating_task
,
843 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
845 .proc_handler
= &proc_dointvec
,
848 .ctl_name
= CTL_UNNUMBERED
,
849 .procname
= "oom_dump_tasks",
850 .data
= &sysctl_oom_dump_tasks
,
851 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
853 .proc_handler
= &proc_dointvec
,
856 .ctl_name
= VM_OVERCOMMIT_RATIO
,
857 .procname
= "overcommit_ratio",
858 .data
= &sysctl_overcommit_ratio
,
859 .maxlen
= sizeof(sysctl_overcommit_ratio
),
861 .proc_handler
= &proc_dointvec
,
864 .ctl_name
= VM_PAGE_CLUSTER
,
865 .procname
= "page-cluster",
866 .data
= &page_cluster
,
867 .maxlen
= sizeof(int),
869 .proc_handler
= &proc_dointvec
,
872 .ctl_name
= VM_DIRTY_BACKGROUND
,
873 .procname
= "dirty_background_ratio",
874 .data
= &dirty_background_ratio
,
875 .maxlen
= sizeof(dirty_background_ratio
),
877 .proc_handler
= &proc_dointvec_minmax
,
878 .strategy
= &sysctl_intvec
,
880 .extra2
= &one_hundred
,
883 .ctl_name
= VM_DIRTY_RATIO
,
884 .procname
= "dirty_ratio",
885 .data
= &vm_dirty_ratio
,
886 .maxlen
= sizeof(vm_dirty_ratio
),
888 .proc_handler
= &dirty_ratio_handler
,
889 .strategy
= &sysctl_intvec
,
891 .extra2
= &one_hundred
,
894 .procname
= "dirty_writeback_centisecs",
895 .data
= &dirty_writeback_interval
,
896 .maxlen
= sizeof(dirty_writeback_interval
),
898 .proc_handler
= &dirty_writeback_centisecs_handler
,
901 .procname
= "dirty_expire_centisecs",
902 .data
= &dirty_expire_interval
,
903 .maxlen
= sizeof(dirty_expire_interval
),
905 .proc_handler
= &proc_dointvec_userhz_jiffies
,
908 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
909 .procname
= "nr_pdflush_threads",
910 .data
= &nr_pdflush_threads
,
911 .maxlen
= sizeof nr_pdflush_threads
,
912 .mode
= 0444 /* read-only*/,
913 .proc_handler
= &proc_dointvec
,
916 .ctl_name
= VM_SWAPPINESS
,
917 .procname
= "swappiness",
918 .data
= &vm_swappiness
,
919 .maxlen
= sizeof(vm_swappiness
),
921 .proc_handler
= &proc_dointvec_minmax
,
922 .strategy
= &sysctl_intvec
,
924 .extra2
= &one_hundred
,
926 #ifdef CONFIG_HUGETLB_PAGE
928 .procname
= "nr_hugepages",
929 .data
= &max_huge_pages
,
930 .maxlen
= sizeof(unsigned long),
932 .proc_handler
= &hugetlb_sysctl_handler
,
933 .extra1
= (void *)&hugetlb_zero
,
934 .extra2
= (void *)&hugetlb_infinity
,
937 .ctl_name
= VM_HUGETLB_GROUP
,
938 .procname
= "hugetlb_shm_group",
939 .data
= &sysctl_hugetlb_shm_group
,
940 .maxlen
= sizeof(gid_t
),
942 .proc_handler
= &proc_dointvec
,
945 .ctl_name
= CTL_UNNUMBERED
,
946 .procname
= "hugepages_treat_as_movable",
947 .data
= &hugepages_treat_as_movable
,
948 .maxlen
= sizeof(int),
950 .proc_handler
= &hugetlb_treat_movable_handler
,
953 .ctl_name
= CTL_UNNUMBERED
,
954 .procname
= "nr_overcommit_hugepages",
955 .data
= &sysctl_overcommit_huge_pages
,
956 .maxlen
= sizeof(sysctl_overcommit_huge_pages
),
958 .proc_handler
= &hugetlb_overcommit_handler
,
962 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
963 .procname
= "lowmem_reserve_ratio",
964 .data
= &sysctl_lowmem_reserve_ratio
,
965 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
967 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
968 .strategy
= &sysctl_intvec
,
971 .ctl_name
= VM_DROP_PAGECACHE
,
972 .procname
= "drop_caches",
973 .data
= &sysctl_drop_caches
,
974 .maxlen
= sizeof(int),
976 .proc_handler
= drop_caches_sysctl_handler
,
977 .strategy
= &sysctl_intvec
,
980 .ctl_name
= VM_MIN_FREE_KBYTES
,
981 .procname
= "min_free_kbytes",
982 .data
= &min_free_kbytes
,
983 .maxlen
= sizeof(min_free_kbytes
),
985 .proc_handler
= &min_free_kbytes_sysctl_handler
,
986 .strategy
= &sysctl_intvec
,
990 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
991 .procname
= "percpu_pagelist_fraction",
992 .data
= &percpu_pagelist_fraction
,
993 .maxlen
= sizeof(percpu_pagelist_fraction
),
995 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
996 .strategy
= &sysctl_intvec
,
997 .extra1
= &min_percpu_pagelist_fract
,
1001 .ctl_name
= VM_MAX_MAP_COUNT
,
1002 .procname
= "max_map_count",
1003 .data
= &sysctl_max_map_count
,
1004 .maxlen
= sizeof(sysctl_max_map_count
),
1006 .proc_handler
= &proc_dointvec
1010 .ctl_name
= VM_LAPTOP_MODE
,
1011 .procname
= "laptop_mode",
1012 .data
= &laptop_mode
,
1013 .maxlen
= sizeof(laptop_mode
),
1015 .proc_handler
= &proc_dointvec_jiffies
,
1016 .strategy
= &sysctl_jiffies
,
1019 .ctl_name
= VM_BLOCK_DUMP
,
1020 .procname
= "block_dump",
1021 .data
= &block_dump
,
1022 .maxlen
= sizeof(block_dump
),
1024 .proc_handler
= &proc_dointvec
,
1025 .strategy
= &sysctl_intvec
,
1029 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1030 .procname
= "vfs_cache_pressure",
1031 .data
= &sysctl_vfs_cache_pressure
,
1032 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1034 .proc_handler
= &proc_dointvec
,
1035 .strategy
= &sysctl_intvec
,
1038 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1040 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1041 .procname
= "legacy_va_layout",
1042 .data
= &sysctl_legacy_va_layout
,
1043 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1045 .proc_handler
= &proc_dointvec
,
1046 .strategy
= &sysctl_intvec
,
1052 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1053 .procname
= "zone_reclaim_mode",
1054 .data
= &zone_reclaim_mode
,
1055 .maxlen
= sizeof(zone_reclaim_mode
),
1057 .proc_handler
= &proc_dointvec
,
1058 .strategy
= &sysctl_intvec
,
1062 .ctl_name
= VM_MIN_UNMAPPED
,
1063 .procname
= "min_unmapped_ratio",
1064 .data
= &sysctl_min_unmapped_ratio
,
1065 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1067 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1068 .strategy
= &sysctl_intvec
,
1070 .extra2
= &one_hundred
,
1073 .ctl_name
= VM_MIN_SLAB
,
1074 .procname
= "min_slab_ratio",
1075 .data
= &sysctl_min_slab_ratio
,
1076 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1078 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1079 .strategy
= &sysctl_intvec
,
1081 .extra2
= &one_hundred
,
1086 .ctl_name
= CTL_UNNUMBERED
,
1087 .procname
= "stat_interval",
1088 .data
= &sysctl_stat_interval
,
1089 .maxlen
= sizeof(sysctl_stat_interval
),
1091 .proc_handler
= &proc_dointvec_jiffies
,
1092 .strategy
= &sysctl_jiffies
,
1095 #ifdef CONFIG_SECURITY
1097 .ctl_name
= CTL_UNNUMBERED
,
1098 .procname
= "mmap_min_addr",
1099 .data
= &mmap_min_addr
,
1100 .maxlen
= sizeof(unsigned long),
1102 .proc_handler
= &proc_doulongvec_minmax
,
1107 .ctl_name
= CTL_UNNUMBERED
,
1108 .procname
= "numa_zonelist_order",
1109 .data
= &numa_zonelist_order
,
1110 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1112 .proc_handler
= &numa_zonelist_order_handler
,
1113 .strategy
= &sysctl_string
,
1116 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1117 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1119 .ctl_name
= VM_VDSO_ENABLED
,
1120 .procname
= "vdso_enabled",
1121 .data
= &vdso_enabled
,
1122 .maxlen
= sizeof(vdso_enabled
),
1124 .proc_handler
= &proc_dointvec
,
1125 .strategy
= &sysctl_intvec
,
1129 #ifdef CONFIG_HIGHMEM
1131 .ctl_name
= CTL_UNNUMBERED
,
1132 .procname
= "highmem_is_dirtyable",
1133 .data
= &vm_highmem_is_dirtyable
,
1134 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1136 .proc_handler
= &proc_dointvec_minmax
,
1137 .strategy
= &sysctl_intvec
,
1143 * NOTE: do not add new entries to this table unless you have read
1144 * Documentation/sysctl/ctl_unnumbered.txt
1149 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1150 static struct ctl_table binfmt_misc_table
[] = {
1155 static struct ctl_table fs_table
[] = {
1157 .ctl_name
= FS_NRINODE
,
1158 .procname
= "inode-nr",
1159 .data
= &inodes_stat
,
1160 .maxlen
= 2*sizeof(int),
1162 .proc_handler
= &proc_dointvec
,
1165 .ctl_name
= FS_STATINODE
,
1166 .procname
= "inode-state",
1167 .data
= &inodes_stat
,
1168 .maxlen
= 7*sizeof(int),
1170 .proc_handler
= &proc_dointvec
,
1173 .procname
= "file-nr",
1174 .data
= &files_stat
,
1175 .maxlen
= 3*sizeof(int),
1177 .proc_handler
= &proc_nr_files
,
1180 .ctl_name
= FS_MAXFILE
,
1181 .procname
= "file-max",
1182 .data
= &files_stat
.max_files
,
1183 .maxlen
= sizeof(int),
1185 .proc_handler
= &proc_dointvec
,
1188 .ctl_name
= CTL_UNNUMBERED
,
1189 .procname
= "nr_open",
1190 .data
= &sysctl_nr_open
,
1191 .maxlen
= sizeof(int),
1193 .proc_handler
= &proc_dointvec
,
1196 .ctl_name
= FS_DENTRY
,
1197 .procname
= "dentry-state",
1198 .data
= &dentry_stat
,
1199 .maxlen
= 6*sizeof(int),
1201 .proc_handler
= &proc_dointvec
,
1204 .ctl_name
= FS_OVERFLOWUID
,
1205 .procname
= "overflowuid",
1206 .data
= &fs_overflowuid
,
1207 .maxlen
= sizeof(int),
1209 .proc_handler
= &proc_dointvec_minmax
,
1210 .strategy
= &sysctl_intvec
,
1211 .extra1
= &minolduid
,
1212 .extra2
= &maxolduid
,
1215 .ctl_name
= FS_OVERFLOWGID
,
1216 .procname
= "overflowgid",
1217 .data
= &fs_overflowgid
,
1218 .maxlen
= sizeof(int),
1220 .proc_handler
= &proc_dointvec_minmax
,
1221 .strategy
= &sysctl_intvec
,
1222 .extra1
= &minolduid
,
1223 .extra2
= &maxolduid
,
1226 .ctl_name
= FS_LEASES
,
1227 .procname
= "leases-enable",
1228 .data
= &leases_enable
,
1229 .maxlen
= sizeof(int),
1231 .proc_handler
= &proc_dointvec
,
1233 #ifdef CONFIG_DNOTIFY
1235 .ctl_name
= FS_DIR_NOTIFY
,
1236 .procname
= "dir-notify-enable",
1237 .data
= &dir_notify_enable
,
1238 .maxlen
= sizeof(int),
1240 .proc_handler
= &proc_dointvec
,
1245 .ctl_name
= FS_LEASE_TIME
,
1246 .procname
= "lease-break-time",
1247 .data
= &lease_break_time
,
1248 .maxlen
= sizeof(int),
1250 .proc_handler
= &proc_dointvec_minmax
,
1251 .strategy
= &sysctl_intvec
,
1256 .procname
= "aio-nr",
1258 .maxlen
= sizeof(aio_nr
),
1260 .proc_handler
= &proc_doulongvec_minmax
,
1263 .procname
= "aio-max-nr",
1264 .data
= &aio_max_nr
,
1265 .maxlen
= sizeof(aio_max_nr
),
1267 .proc_handler
= &proc_doulongvec_minmax
,
1269 #ifdef CONFIG_INOTIFY_USER
1271 .ctl_name
= FS_INOTIFY
,
1272 .procname
= "inotify",
1274 .child
= inotify_table
,
1279 .ctl_name
= KERN_SETUID_DUMPABLE
,
1280 .procname
= "suid_dumpable",
1281 .data
= &suid_dumpable
,
1282 .maxlen
= sizeof(int),
1284 .proc_handler
= &proc_dointvec
,
1286 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1288 .ctl_name
= CTL_UNNUMBERED
,
1289 .procname
= "binfmt_misc",
1291 .child
= binfmt_misc_table
,
1295 * NOTE: do not add new entries to this table unless you have read
1296 * Documentation/sysctl/ctl_unnumbered.txt
1301 static struct ctl_table debug_table
[] = {
1302 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1304 .ctl_name
= CTL_UNNUMBERED
,
1305 .procname
= "exception-trace",
1306 .data
= &show_unhandled_signals
,
1307 .maxlen
= sizeof(int),
1309 .proc_handler
= proc_dointvec
1315 static struct ctl_table dev_table
[] = {
1319 static DEFINE_SPINLOCK(sysctl_lock
);
1321 /* called under sysctl_lock */
1322 static int use_table(struct ctl_table_header
*p
)
1324 if (unlikely(p
->unregistering
))
1330 /* called under sysctl_lock */
1331 static void unuse_table(struct ctl_table_header
*p
)
1334 if (unlikely(p
->unregistering
))
1335 complete(p
->unregistering
);
1338 /* called under sysctl_lock, will reacquire if has to wait */
1339 static void start_unregistering(struct ctl_table_header
*p
)
1342 * if p->used is 0, nobody will ever touch that entry again;
1343 * we'll eliminate all paths to it before dropping sysctl_lock
1345 if (unlikely(p
->used
)) {
1346 struct completion wait
;
1347 init_completion(&wait
);
1348 p
->unregistering
= &wait
;
1349 spin_unlock(&sysctl_lock
);
1350 wait_for_completion(&wait
);
1351 spin_lock(&sysctl_lock
);
1354 * do not remove from the list until nobody holds it; walking the
1355 * list in do_sysctl() relies on that.
1357 list_del_init(&p
->ctl_entry
);
1360 void sysctl_head_finish(struct ctl_table_header
*head
)
1364 spin_lock(&sysctl_lock
);
1366 spin_unlock(&sysctl_lock
);
1369 static struct list_head
*
1370 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1372 struct list_head
*header_list
;
1373 header_list
= &root
->header_list
;
1375 header_list
= root
->lookup(root
, namespaces
);
1379 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1380 struct ctl_table_header
*prev
)
1382 struct ctl_table_root
*root
;
1383 struct list_head
*header_list
;
1384 struct ctl_table_header
*head
;
1385 struct list_head
*tmp
;
1387 spin_lock(&sysctl_lock
);
1390 tmp
= &prev
->ctl_entry
;
1394 tmp
= &root_table_header
.ctl_entry
;
1396 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1398 if (!use_table(head
))
1400 spin_unlock(&sysctl_lock
);
1405 header_list
= lookup_header_list(root
, namespaces
);
1406 if (tmp
!= header_list
)
1410 root
= list_entry(root
->root_list
.next
,
1411 struct ctl_table_root
, root_list
);
1412 if (root
== &sysctl_table_root
)
1414 header_list
= lookup_header_list(root
, namespaces
);
1415 } while (list_empty(header_list
));
1416 tmp
= header_list
->next
;
1419 spin_unlock(&sysctl_lock
);
1423 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1425 return __sysctl_head_next(current
->nsproxy
, prev
);
1428 void register_sysctl_root(struct ctl_table_root
*root
)
1430 spin_lock(&sysctl_lock
);
1431 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1432 spin_unlock(&sysctl_lock
);
1435 #ifdef CONFIG_SYSCTL_SYSCALL
1436 /* Perform the actual read/write of a sysctl table entry. */
1437 static int do_sysctl_strategy(struct ctl_table
*table
,
1438 int __user
*name
, int nlen
,
1439 void __user
*oldval
, size_t __user
*oldlenp
,
1440 void __user
*newval
, size_t newlen
)
1448 if (sysctl_perm(table
, op
))
1451 if (table
->strategy
) {
1452 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1460 /* If there is no strategy routine, or if the strategy returns
1461 * zero, proceed with automatic r/w */
1462 if (table
->data
&& table
->maxlen
) {
1463 rc
= sysctl_data(table
, name
, nlen
, oldval
, oldlenp
,
1471 static int parse_table(int __user
*name
, int nlen
,
1472 void __user
*oldval
, size_t __user
*oldlenp
,
1473 void __user
*newval
, size_t newlen
,
1474 struct ctl_table
*table
)
1480 if (get_user(n
, name
))
1482 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1483 if (!table
->ctl_name
)
1485 if (n
== table
->ctl_name
) {
1488 if (sysctl_perm(table
, 001))
1492 table
= table
->child
;
1495 error
= do_sysctl_strategy(table
, name
, nlen
,
1504 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1505 void __user
*newval
, size_t newlen
)
1507 struct ctl_table_header
*head
;
1508 int error
= -ENOTDIR
;
1510 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1514 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1518 for (head
= sysctl_head_next(NULL
); head
;
1519 head
= sysctl_head_next(head
)) {
1520 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1521 newval
, newlen
, head
->ctl_table
);
1522 if (error
!= -ENOTDIR
) {
1523 sysctl_head_finish(head
);
1530 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1532 struct __sysctl_args tmp
;
1535 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1538 error
= deprecated_sysctl_warning(&tmp
);
1543 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1544 tmp
.newval
, tmp
.newlen
);
1549 #endif /* CONFIG_SYSCTL_SYSCALL */
1552 * sysctl_perm does NOT grant the superuser all rights automatically, because
1553 * some sysctl variables are readonly even to root.
1556 static int test_perm(int mode
, int op
)
1560 else if (in_egroup_p(0))
1562 if ((mode
& op
& 0007) == op
)
1567 int sysctl_perm(struct ctl_table
*table
, int op
)
1570 error
= security_sysctl(table
, op
);
1573 return test_perm(table
->mode
, op
);
1576 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1578 for (; table
->ctl_name
|| table
->procname
; table
++) {
1579 table
->parent
= parent
;
1581 sysctl_set_parent(table
, table
->child
);
1585 static __init
int sysctl_init(void)
1587 sysctl_set_parent(NULL
, root_table
);
1588 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1591 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1597 core_initcall(sysctl_init
);
1600 * __register_sysctl_paths - register a sysctl hierarchy
1601 * @root: List of sysctl headers to register on
1602 * @namespaces: Data to compute which lists of sysctl entries are visible
1603 * @path: The path to the directory the sysctl table is in.
1604 * @table: the top-level table structure
1606 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1607 * array. A completely 0 filled entry terminates the table.
1609 * The members of the &struct ctl_table structure are used as follows:
1611 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1612 * must be unique within that level of sysctl
1614 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1615 * enter a sysctl file
1617 * data - a pointer to data for use by proc_handler
1619 * maxlen - the maximum size in bytes of the data
1621 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1623 * child - a pointer to the child sysctl table if this entry is a directory, or
1626 * proc_handler - the text handler routine (described below)
1628 * strategy - the strategy routine (described below)
1630 * de - for internal use by the sysctl routines
1632 * extra1, extra2 - extra pointers usable by the proc handler routines
1634 * Leaf nodes in the sysctl tree will be represented by a single file
1635 * under /proc; non-leaf nodes will be represented by directories.
1637 * sysctl(2) can automatically manage read and write requests through
1638 * the sysctl table. The data and maxlen fields of the ctl_table
1639 * struct enable minimal validation of the values being written to be
1640 * performed, and the mode field allows minimal authentication.
1642 * More sophisticated management can be enabled by the provision of a
1643 * strategy routine with the table entry. This will be called before
1644 * any automatic read or write of the data is performed.
1646 * The strategy routine may return
1648 * < 0 - Error occurred (error is passed to user process)
1650 * 0 - OK - proceed with automatic read or write.
1652 * > 0 - OK - read or write has been done by the strategy routine, so
1653 * return immediately.
1655 * There must be a proc_handler routine for any terminal nodes
1656 * mirrored under /proc/sys (non-terminals are handled by a built-in
1657 * directory handler). Several default handlers are available to
1658 * cover common cases -
1660 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1661 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1662 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1664 * It is the handler's job to read the input buffer from user memory
1665 * and process it. The handler should return 0 on success.
1667 * This routine returns %NULL on a failure to register, and a pointer
1668 * to the table header on success.
1670 struct ctl_table_header
*__register_sysctl_paths(
1671 struct ctl_table_root
*root
,
1672 struct nsproxy
*namespaces
,
1673 const struct ctl_path
*path
, struct ctl_table
*table
)
1675 struct list_head
*header_list
;
1676 struct ctl_table_header
*header
;
1677 struct ctl_table
*new, **prevp
;
1678 unsigned int n
, npath
;
1680 /* Count the path components */
1681 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1685 * For each path component, allocate a 2-element ctl_table array.
1686 * The first array element will be filled with the sysctl entry
1687 * for this, the second will be the sentinel (ctl_name == 0).
1689 * We allocate everything in one go so that we don't have to
1690 * worry about freeing additional memory in unregister_sysctl_table.
1692 header
= kzalloc(sizeof(struct ctl_table_header
) +
1693 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1697 new = (struct ctl_table
*) (header
+ 1);
1699 /* Now connect the dots */
1700 prevp
= &header
->ctl_table
;
1701 for (n
= 0; n
< npath
; ++n
, ++path
) {
1702 /* Copy the procname */
1703 new->procname
= path
->procname
;
1704 new->ctl_name
= path
->ctl_name
;
1708 prevp
= &new->child
;
1713 header
->ctl_table_arg
= table
;
1715 INIT_LIST_HEAD(&header
->ctl_entry
);
1717 header
->unregistering
= NULL
;
1718 header
->root
= root
;
1719 sysctl_set_parent(NULL
, header
->ctl_table
);
1720 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1721 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
1726 spin_lock(&sysctl_lock
);
1727 header_list
= lookup_header_list(root
, namespaces
);
1728 list_add_tail(&header
->ctl_entry
, header_list
);
1729 spin_unlock(&sysctl_lock
);
1735 * register_sysctl_table_path - register a sysctl table hierarchy
1736 * @path: The path to the directory the sysctl table is in.
1737 * @table: the top-level table structure
1739 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1740 * array. A completely 0 filled entry terminates the table.
1742 * See __register_sysctl_paths for more details.
1744 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1745 struct ctl_table
*table
)
1747 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
1752 * register_sysctl_table - register a sysctl table hierarchy
1753 * @table: the top-level table structure
1755 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1756 * array. A completely 0 filled entry terminates the table.
1758 * See register_sysctl_paths for more details.
1760 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
1762 static const struct ctl_path null_path
[] = { {} };
1764 return register_sysctl_paths(null_path
, table
);
1768 * unregister_sysctl_table - unregister a sysctl table hierarchy
1769 * @header: the header returned from register_sysctl_table
1771 * Unregisters the sysctl table and all children. proc entries may not
1772 * actually be removed until they are no longer used by anyone.
1774 void unregister_sysctl_table(struct ctl_table_header
* header
)
1781 spin_lock(&sysctl_lock
);
1782 start_unregistering(header
);
1783 spin_unlock(&sysctl_lock
);
1787 #else /* !CONFIG_SYSCTL */
1788 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
1793 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1794 struct ctl_table
*table
)
1799 void unregister_sysctl_table(struct ctl_table_header
* table
)
1803 #endif /* CONFIG_SYSCTL */
1809 #ifdef CONFIG_PROC_SYSCTL
1811 static int _proc_do_string(void* data
, int maxlen
, int write
,
1812 struct file
*filp
, void __user
*buffer
,
1813 size_t *lenp
, loff_t
*ppos
)
1819 if (!data
|| !maxlen
|| !*lenp
) {
1827 while (len
< *lenp
) {
1828 if (get_user(c
, p
++))
1830 if (c
== 0 || c
== '\n')
1836 if(copy_from_user(data
, buffer
, len
))
1838 ((char *) data
)[len
] = 0;
1856 if(copy_to_user(buffer
, data
, len
))
1859 if(put_user('\n', ((char __user
*) buffer
) + len
))
1870 * proc_dostring - read a string sysctl
1871 * @table: the sysctl table
1872 * @write: %TRUE if this is a write to the sysctl file
1873 * @filp: the file structure
1874 * @buffer: the user buffer
1875 * @lenp: the size of the user buffer
1876 * @ppos: file position
1878 * Reads/writes a string from/to the user buffer. If the kernel
1879 * buffer provided is not large enough to hold the string, the
1880 * string is truncated. The copied string is %NULL-terminated.
1881 * If the string is being read by the user process, it is copied
1882 * and a newline '\n' is added. It is truncated if the buffer is
1885 * Returns 0 on success.
1887 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
1888 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1890 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1891 buffer
, lenp
, ppos
);
1895 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1897 int write
, void *data
)
1900 *valp
= *negp
? -*lvalp
: *lvalp
;
1905 *lvalp
= (unsigned long)-val
;
1908 *lvalp
= (unsigned long)val
;
1914 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1915 int write
, struct file
*filp
, void __user
*buffer
,
1916 size_t *lenp
, loff_t
*ppos
,
1917 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1918 int write
, void *data
),
1921 #define TMPBUFLEN 21
1922 int *i
, vleft
, first
=1, neg
, val
;
1926 char buf
[TMPBUFLEN
], *p
;
1927 char __user
*s
= buffer
;
1929 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1930 (*ppos
&& !write
)) {
1935 i
= (int *) tbl_data
;
1936 vleft
= table
->maxlen
/ sizeof(*i
);
1940 conv
= do_proc_dointvec_conv
;
1942 for (; left
&& vleft
--; i
++, first
=0) {
1957 if (len
> sizeof(buf
) - 1)
1958 len
= sizeof(buf
) - 1;
1959 if (copy_from_user(buf
, s
, len
))
1963 if (*p
== '-' && left
> 1) {
1967 if (*p
< '0' || *p
> '9')
1970 lval
= simple_strtoul(p
, &p
, 0);
1973 if ((len
< left
) && *p
&& !isspace(*p
))
1980 if (conv(&neg
, &lval
, i
, 1, data
))
1987 if (conv(&neg
, &lval
, i
, 0, data
))
1990 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1994 if(copy_to_user(s
, buf
, len
))
2001 if (!write
&& !first
&& left
) {
2002 if(put_user('\n', s
))
2009 if (get_user(c
, s
++))
2024 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2025 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2026 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2027 int write
, void *data
),
2030 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2031 buffer
, lenp
, ppos
, conv
, data
);
2035 * proc_dointvec - read a vector of integers
2036 * @table: the sysctl table
2037 * @write: %TRUE if this is a write to the sysctl file
2038 * @filp: the file structure
2039 * @buffer: the user buffer
2040 * @lenp: the size of the user buffer
2041 * @ppos: file position
2043 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2044 * values from/to the user buffer, treated as an ASCII string.
2046 * Returns 0 on success.
2048 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2049 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2051 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2059 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
2061 int write
, void *data
)
2063 int op
= *(int *)data
;
2065 int val
= *negp
? -*lvalp
: *lvalp
;
2067 case OP_SET
: *valp
= val
; break;
2068 case OP_AND
: *valp
&= val
; break;
2069 case OP_OR
: *valp
|= val
; break;
2075 *lvalp
= (unsigned long)-val
;
2078 *lvalp
= (unsigned long)val
;
2085 * Taint values can only be increased
2087 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2088 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2092 if (write
&& !capable(CAP_SYS_ADMIN
))
2096 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2097 do_proc_dointvec_bset_conv
,&op
);
2100 struct do_proc_dointvec_minmax_conv_param
{
2105 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2107 int write
, void *data
)
2109 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2111 int val
= *negp
? -*lvalp
: *lvalp
;
2112 if ((param
->min
&& *param
->min
> val
) ||
2113 (param
->max
&& *param
->max
< val
))
2120 *lvalp
= (unsigned long)-val
;
2123 *lvalp
= (unsigned long)val
;
2130 * proc_dointvec_minmax - read a vector of integers with min/max values
2131 * @table: the sysctl table
2132 * @write: %TRUE if this is a write to the sysctl file
2133 * @filp: the file structure
2134 * @buffer: the user buffer
2135 * @lenp: the size of the user buffer
2136 * @ppos: file position
2138 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2139 * values from/to the user buffer, treated as an ASCII string.
2141 * This routine will ensure the values are within the range specified by
2142 * table->extra1 (min) and table->extra2 (max).
2144 * Returns 0 on success.
2146 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2149 struct do_proc_dointvec_minmax_conv_param param
= {
2150 .min
= (int *) table
->extra1
,
2151 .max
= (int *) table
->extra2
,
2153 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2154 do_proc_dointvec_minmax_conv
, ¶m
);
2157 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2159 void __user
*buffer
,
2160 size_t *lenp
, loff_t
*ppos
,
2161 unsigned long convmul
,
2162 unsigned long convdiv
)
2164 #define TMPBUFLEN 21
2165 unsigned long *i
, *min
, *max
, val
;
2166 int vleft
, first
=1, neg
;
2168 char buf
[TMPBUFLEN
], *p
;
2169 char __user
*s
= buffer
;
2171 if (!data
|| !table
->maxlen
|| !*lenp
||
2172 (*ppos
&& !write
)) {
2177 i
= (unsigned long *) data
;
2178 min
= (unsigned long *) table
->extra1
;
2179 max
= (unsigned long *) table
->extra2
;
2180 vleft
= table
->maxlen
/ sizeof(unsigned long);
2183 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2198 if (len
> TMPBUFLEN
-1)
2200 if (copy_from_user(buf
, s
, len
))
2204 if (*p
== '-' && left
> 1) {
2208 if (*p
< '0' || *p
> '9')
2210 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2212 if ((len
< left
) && *p
&& !isspace(*p
))
2221 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2228 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2232 if(copy_to_user(s
, buf
, len
))
2239 if (!write
&& !first
&& left
) {
2240 if(put_user('\n', s
))
2247 if (get_user(c
, s
++))
2262 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2264 void __user
*buffer
,
2265 size_t *lenp
, loff_t
*ppos
,
2266 unsigned long convmul
,
2267 unsigned long convdiv
)
2269 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2270 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2274 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2275 * @table: the sysctl table
2276 * @write: %TRUE if this is a write to the sysctl file
2277 * @filp: the file structure
2278 * @buffer: the user buffer
2279 * @lenp: the size of the user buffer
2280 * @ppos: file position
2282 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2283 * values from/to the user buffer, treated as an ASCII string.
2285 * This routine will ensure the values are within the range specified by
2286 * table->extra1 (min) and table->extra2 (max).
2288 * Returns 0 on success.
2290 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2291 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2293 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2297 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2298 * @table: the sysctl table
2299 * @write: %TRUE if this is a write to the sysctl file
2300 * @filp: the file structure
2301 * @buffer: the user buffer
2302 * @lenp: the size of the user buffer
2303 * @ppos: file position
2305 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2306 * values from/to the user buffer, treated as an ASCII string. The values
2307 * are treated as milliseconds, and converted to jiffies when they are stored.
2309 * This routine will ensure the values are within the range specified by
2310 * table->extra1 (min) and table->extra2 (max).
2312 * Returns 0 on success.
2314 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2316 void __user
*buffer
,
2317 size_t *lenp
, loff_t
*ppos
)
2319 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2320 lenp
, ppos
, HZ
, 1000l);
2324 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2326 int write
, void *data
)
2329 if (*lvalp
> LONG_MAX
/ HZ
)
2331 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2337 lval
= (unsigned long)-val
;
2340 lval
= (unsigned long)val
;
2347 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2349 int write
, void *data
)
2352 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2354 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2360 lval
= (unsigned long)-val
;
2363 lval
= (unsigned long)val
;
2365 *lvalp
= jiffies_to_clock_t(lval
);
2370 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2372 int write
, void *data
)
2375 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2381 lval
= (unsigned long)-val
;
2384 lval
= (unsigned long)val
;
2386 *lvalp
= jiffies_to_msecs(lval
);
2392 * proc_dointvec_jiffies - read a vector of integers as seconds
2393 * @table: the sysctl table
2394 * @write: %TRUE if this is a write to the sysctl file
2395 * @filp: the file structure
2396 * @buffer: the user buffer
2397 * @lenp: the size of the user buffer
2398 * @ppos: file position
2400 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2401 * values from/to the user buffer, treated as an ASCII string.
2402 * The values read are assumed to be in seconds, and are converted into
2405 * Returns 0 on success.
2407 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2408 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2410 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2411 do_proc_dointvec_jiffies_conv
,NULL
);
2415 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2416 * @table: the sysctl table
2417 * @write: %TRUE if this is a write to the sysctl file
2418 * @filp: the file structure
2419 * @buffer: the user buffer
2420 * @lenp: the size of the user buffer
2421 * @ppos: pointer to the file position
2423 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2424 * values from/to the user buffer, treated as an ASCII string.
2425 * The values read are assumed to be in 1/USER_HZ seconds, and
2426 * are converted into jiffies.
2428 * Returns 0 on success.
2430 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2431 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2433 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2434 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2438 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2439 * @table: the sysctl table
2440 * @write: %TRUE if this is a write to the sysctl file
2441 * @filp: the file structure
2442 * @buffer: the user buffer
2443 * @lenp: the size of the user buffer
2444 * @ppos: file position
2445 * @ppos: the current position in the file
2447 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2448 * values from/to the user buffer, treated as an ASCII string.
2449 * The values read are assumed to be in 1/1000 seconds, and
2450 * are converted into jiffies.
2452 * Returns 0 on success.
2454 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2455 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2457 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2458 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2461 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2462 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2464 struct pid
*new_pid
;
2468 tmp
= pid_vnr(cad_pid
);
2470 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2471 lenp
, ppos
, NULL
, NULL
);
2475 new_pid
= find_get_pid(tmp
);
2479 put_pid(xchg(&cad_pid
, new_pid
));
2483 #else /* CONFIG_PROC_FS */
2485 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2486 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2491 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2492 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2497 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2498 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2503 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2504 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2509 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2510 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2515 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2516 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2521 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2522 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2527 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2529 void __user
*buffer
,
2530 size_t *lenp
, loff_t
*ppos
)
2536 #endif /* CONFIG_PROC_FS */
2539 #ifdef CONFIG_SYSCTL_SYSCALL
2541 * General sysctl support routines
2544 /* The generic sysctl data routine (used if no strategy routine supplied) */
2545 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2546 void __user
*oldval
, size_t __user
*oldlenp
,
2547 void __user
*newval
, size_t newlen
)
2551 /* Get out of I don't have a variable */
2552 if (!table
->data
|| !table
->maxlen
)
2555 if (oldval
&& oldlenp
) {
2556 if (get_user(len
, oldlenp
))
2559 if (len
> table
->maxlen
)
2560 len
= table
->maxlen
;
2561 if (copy_to_user(oldval
, table
->data
, len
))
2563 if (put_user(len
, oldlenp
))
2568 if (newval
&& newlen
) {
2569 if (newlen
> table
->maxlen
)
2570 newlen
= table
->maxlen
;
2572 if (copy_from_user(table
->data
, newval
, newlen
))
2578 /* The generic string strategy routine: */
2579 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2580 void __user
*oldval
, size_t __user
*oldlenp
,
2581 void __user
*newval
, size_t newlen
)
2583 if (!table
->data
|| !table
->maxlen
)
2586 if (oldval
&& oldlenp
) {
2588 if (get_user(bufsize
, oldlenp
))
2591 size_t len
= strlen(table
->data
), copied
;
2593 /* This shouldn't trigger for a well-formed sysctl */
2594 if (len
> table
->maxlen
)
2595 len
= table
->maxlen
;
2597 /* Copy up to a max of bufsize-1 bytes of the string */
2598 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2600 if (copy_to_user(oldval
, table
->data
, copied
) ||
2601 put_user(0, (char __user
*)(oldval
+ copied
)))
2603 if (put_user(len
, oldlenp
))
2607 if (newval
&& newlen
) {
2608 size_t len
= newlen
;
2609 if (len
> table
->maxlen
)
2610 len
= table
->maxlen
;
2611 if(copy_from_user(table
->data
, newval
, len
))
2613 if (len
== table
->maxlen
)
2615 ((char *) table
->data
)[len
] = 0;
2621 * This function makes sure that all of the integers in the vector
2622 * are between the minimum and maximum values given in the arrays
2623 * table->extra1 and table->extra2, respectively.
2625 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2626 void __user
*oldval
, size_t __user
*oldlenp
,
2627 void __user
*newval
, size_t newlen
)
2630 if (newval
&& newlen
) {
2631 int __user
*vec
= (int __user
*) newval
;
2632 int *min
= (int *) table
->extra1
;
2633 int *max
= (int *) table
->extra2
;
2637 if (newlen
% sizeof(int) != 0)
2640 if (!table
->extra1
&& !table
->extra2
)
2643 if (newlen
> table
->maxlen
)
2644 newlen
= table
->maxlen
;
2645 length
= newlen
/ sizeof(int);
2647 for (i
= 0; i
< length
; i
++) {
2649 if (get_user(value
, vec
+ i
))
2651 if (min
&& value
< min
[i
])
2653 if (max
&& value
> max
[i
])
2660 /* Strategy function to convert jiffies to seconds */
2661 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2662 void __user
*oldval
, size_t __user
*oldlenp
,
2663 void __user
*newval
, size_t newlen
)
2665 if (oldval
&& oldlenp
) {
2668 if (get_user(olen
, oldlenp
))
2673 if (olen
< sizeof(int))
2676 val
= *(int *)(table
->data
) / HZ
;
2677 if (put_user(val
, (int __user
*)oldval
))
2679 if (put_user(sizeof(int), oldlenp
))
2683 if (newval
&& newlen
) {
2685 if (newlen
!= sizeof(int))
2687 if (get_user(new, (int __user
*)newval
))
2689 *(int *)(table
->data
) = new*HZ
;
2694 /* Strategy function to convert jiffies to seconds */
2695 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2696 void __user
*oldval
, size_t __user
*oldlenp
,
2697 void __user
*newval
, size_t newlen
)
2699 if (oldval
&& oldlenp
) {
2702 if (get_user(olen
, oldlenp
))
2707 if (olen
< sizeof(int))
2710 val
= jiffies_to_msecs(*(int *)(table
->data
));
2711 if (put_user(val
, (int __user
*)oldval
))
2713 if (put_user(sizeof(int), oldlenp
))
2717 if (newval
&& newlen
) {
2719 if (newlen
!= sizeof(int))
2721 if (get_user(new, (int __user
*)newval
))
2723 *(int *)(table
->data
) = msecs_to_jiffies(new);
2730 #else /* CONFIG_SYSCTL_SYSCALL */
2733 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2735 struct __sysctl_args tmp
;
2738 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2741 error
= deprecated_sysctl_warning(&tmp
);
2743 /* If no error reading the parameters then just -ENOSYS ... */
2750 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2751 void __user
*oldval
, size_t __user
*oldlenp
,
2752 void __user
*newval
, size_t newlen
)
2757 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2758 void __user
*oldval
, size_t __user
*oldlenp
,
2759 void __user
*newval
, size_t newlen
)
2764 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2765 void __user
*oldval
, size_t __user
*oldlenp
,
2766 void __user
*newval
, size_t newlen
)
2771 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2772 void __user
*oldval
, size_t __user
*oldlenp
,
2773 void __user
*newval
, size_t newlen
)
2778 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2779 void __user
*oldval
, size_t __user
*oldlenp
,
2780 void __user
*newval
, size_t newlen
)
2785 #endif /* CONFIG_SYSCTL_SYSCALL */
2787 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
2789 static int msg_count
;
2790 int name
[CTL_MAXNAME
];
2793 /* Check args->nlen. */
2794 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
2797 /* Read in the sysctl name for better debug message logging */
2798 for (i
= 0; i
< args
->nlen
; i
++)
2799 if (get_user(name
[i
], args
->name
+ i
))
2802 /* Ignore accesses to kernel.version */
2803 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2806 if (msg_count
< 5) {
2809 "warning: process `%s' used the deprecated sysctl "
2810 "system call with ", current
->comm
);
2811 for (i
= 0; i
< args
->nlen
; i
++)
2812 printk("%d.", name
[i
]);
2819 * No sense putting this after each symbol definition, twice,
2820 * exception granted :-)
2822 EXPORT_SYMBOL(proc_dointvec
);
2823 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2824 EXPORT_SYMBOL(proc_dointvec_minmax
);
2825 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2826 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2827 EXPORT_SYMBOL(proc_dostring
);
2828 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2829 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2830 EXPORT_SYMBOL(register_sysctl_table
);
2831 EXPORT_SYMBOL(register_sysctl_paths
);
2832 EXPORT_SYMBOL(sysctl_intvec
);
2833 EXPORT_SYMBOL(sysctl_jiffies
);
2834 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2835 EXPORT_SYMBOL(sysctl_string
);
2836 EXPORT_SYMBOL(sysctl_data
);
2837 EXPORT_SYMBOL(unregister_sysctl_table
);