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
;
86 /* Constants used for minimum and maximum */
87 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
91 #ifdef CONFIG_DETECT_SOFTLOCKUP
92 static int sixty
= 60;
100 static int one_hundred
= 100;
102 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
103 static int maxolduid
= 65535;
104 static int minolduid
;
105 static int min_percpu_pagelist_fract
= 8;
107 static int ngroups_max
= NGROUPS_MAX
;
110 extern char modprobe_path
[];
112 #ifdef CONFIG_CHR_DEV_SG
113 extern int sg_big_buff
;
117 extern char reboot_command
[];
118 extern int stop_a_enabled
;
119 extern int scons_pwroff
;
123 extern int pwrsw_enabled
;
124 extern int unaligned_enabled
;
128 #ifdef CONFIG_MATHEMU
129 extern int sysctl_ieee_emulation_warnings
;
131 extern int sysctl_userprocess_debug
;
132 extern int spin_retry
;
135 extern int sysctl_hz_timer
;
137 #ifdef CONFIG_BSD_PROCESS_ACCT
138 extern int acct_parm
[];
142 extern int no_unaligned_warning
;
145 #ifdef CONFIG_RT_MUTEXES
146 extern int max_lock_depth
;
149 #ifdef CONFIG_PROC_SYSCTL
150 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
151 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
152 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
156 static struct ctl_table root_table
[];
157 static struct ctl_table_root sysctl_table_root
;
158 static struct ctl_table_header root_table_header
= {
159 .ctl_table
= root_table
,
160 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.header_list
),
161 .root
= &sysctl_table_root
,
163 static struct ctl_table_root sysctl_table_root
= {
164 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
165 .header_list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
168 static struct ctl_table kern_table
[];
169 static struct ctl_table vm_table
[];
170 static struct ctl_table fs_table
[];
171 static struct ctl_table debug_table
[];
172 static struct ctl_table dev_table
[];
173 extern struct ctl_table random_table
[];
174 #ifdef CONFIG_INOTIFY_USER
175 extern struct ctl_table inotify_table
[];
178 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
179 int sysctl_legacy_va_layout
;
182 extern int prove_locking
;
183 extern int lock_stat
;
185 /* The default sysctl tables: */
187 static struct ctl_table root_table
[] = {
189 .ctl_name
= CTL_KERN
,
190 .procname
= "kernel",
207 .ctl_name
= CTL_DEBUG
,
210 .child
= debug_table
,
219 * NOTE: do not add new entries to this table unless you have read
220 * Documentation/sysctl/ctl_unnumbered.txt
225 #ifdef CONFIG_SCHED_DEBUG
226 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
227 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
228 static int min_wakeup_granularity_ns
; /* 0 usecs */
229 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
232 static struct ctl_table kern_table
[] = {
233 #ifdef CONFIG_SCHED_DEBUG
235 .ctl_name
= CTL_UNNUMBERED
,
236 .procname
= "sched_min_granularity_ns",
237 .data
= &sysctl_sched_min_granularity
,
238 .maxlen
= sizeof(unsigned int),
240 .proc_handler
= &sched_nr_latency_handler
,
241 .strategy
= &sysctl_intvec
,
242 .extra1
= &min_sched_granularity_ns
,
243 .extra2
= &max_sched_granularity_ns
,
246 .ctl_name
= CTL_UNNUMBERED
,
247 .procname
= "sched_latency_ns",
248 .data
= &sysctl_sched_latency
,
249 .maxlen
= sizeof(unsigned int),
251 .proc_handler
= &sched_nr_latency_handler
,
252 .strategy
= &sysctl_intvec
,
253 .extra1
= &min_sched_granularity_ns
,
254 .extra2
= &max_sched_granularity_ns
,
257 .ctl_name
= CTL_UNNUMBERED
,
258 .procname
= "sched_wakeup_granularity_ns",
259 .data
= &sysctl_sched_wakeup_granularity
,
260 .maxlen
= sizeof(unsigned int),
262 .proc_handler
= &proc_dointvec_minmax
,
263 .strategy
= &sysctl_intvec
,
264 .extra1
= &min_wakeup_granularity_ns
,
265 .extra2
= &max_wakeup_granularity_ns
,
268 .ctl_name
= CTL_UNNUMBERED
,
269 .procname
= "sched_shares_ratelimit",
270 .data
= &sysctl_sched_shares_ratelimit
,
271 .maxlen
= sizeof(unsigned int),
273 .proc_handler
= &proc_dointvec
,
276 .ctl_name
= CTL_UNNUMBERED
,
277 .procname
= "sched_child_runs_first",
278 .data
= &sysctl_sched_child_runs_first
,
279 .maxlen
= sizeof(unsigned int),
281 .proc_handler
= &proc_dointvec
,
284 .ctl_name
= CTL_UNNUMBERED
,
285 .procname
= "sched_features",
286 .data
= &sysctl_sched_features
,
287 .maxlen
= sizeof(unsigned int),
289 .proc_handler
= &proc_dointvec
,
292 .ctl_name
= CTL_UNNUMBERED
,
293 .procname
= "sched_migration_cost",
294 .data
= &sysctl_sched_migration_cost
,
295 .maxlen
= sizeof(unsigned int),
297 .proc_handler
= &proc_dointvec
,
300 .ctl_name
= CTL_UNNUMBERED
,
301 .procname
= "sched_nr_migrate",
302 .data
= &sysctl_sched_nr_migrate
,
303 .maxlen
= sizeof(unsigned int),
305 .proc_handler
= &proc_dointvec
,
309 .ctl_name
= CTL_UNNUMBERED
,
310 .procname
= "sched_rt_period_us",
311 .data
= &sysctl_sched_rt_period
,
312 .maxlen
= sizeof(unsigned int),
314 .proc_handler
= &sched_rt_handler
,
317 .ctl_name
= CTL_UNNUMBERED
,
318 .procname
= "sched_rt_runtime_us",
319 .data
= &sysctl_sched_rt_runtime
,
320 .maxlen
= sizeof(int),
322 .proc_handler
= &sched_rt_handler
,
325 .ctl_name
= CTL_UNNUMBERED
,
326 .procname
= "sched_compat_yield",
327 .data
= &sysctl_sched_compat_yield
,
328 .maxlen
= sizeof(unsigned int),
330 .proc_handler
= &proc_dointvec
,
332 #ifdef CONFIG_PROVE_LOCKING
334 .ctl_name
= CTL_UNNUMBERED
,
335 .procname
= "prove_locking",
336 .data
= &prove_locking
,
337 .maxlen
= sizeof(int),
339 .proc_handler
= &proc_dointvec
,
342 #ifdef CONFIG_LOCK_STAT
344 .ctl_name
= CTL_UNNUMBERED
,
345 .procname
= "lock_stat",
347 .maxlen
= sizeof(int),
349 .proc_handler
= &proc_dointvec
,
353 .ctl_name
= KERN_PANIC
,
355 .data
= &panic_timeout
,
356 .maxlen
= sizeof(int),
358 .proc_handler
= &proc_dointvec
,
361 .ctl_name
= KERN_CORE_USES_PID
,
362 .procname
= "core_uses_pid",
363 .data
= &core_uses_pid
,
364 .maxlen
= sizeof(int),
366 .proc_handler
= &proc_dointvec
,
369 .ctl_name
= KERN_CORE_PATTERN
,
370 .procname
= "core_pattern",
371 .data
= core_pattern
,
372 .maxlen
= CORENAME_MAX_SIZE
,
374 .proc_handler
= &proc_dostring
,
375 .strategy
= &sysctl_string
,
377 #ifdef CONFIG_PROC_SYSCTL
379 .procname
= "tainted",
381 .maxlen
= sizeof(int),
383 .proc_handler
= &proc_dointvec_taint
,
386 #ifdef CONFIG_LATENCYTOP
388 .procname
= "latencytop",
389 .data
= &latencytop_enabled
,
390 .maxlen
= sizeof(int),
392 .proc_handler
= &proc_dointvec
,
395 #ifdef CONFIG_BLK_DEV_INITRD
397 .ctl_name
= KERN_REALROOTDEV
,
398 .procname
= "real-root-dev",
399 .data
= &real_root_dev
,
400 .maxlen
= sizeof(int),
402 .proc_handler
= &proc_dointvec
,
406 .ctl_name
= CTL_UNNUMBERED
,
407 .procname
= "print-fatal-signals",
408 .data
= &print_fatal_signals
,
409 .maxlen
= sizeof(int),
411 .proc_handler
= &proc_dointvec
,
415 .ctl_name
= KERN_SPARC_REBOOT
,
416 .procname
= "reboot-cmd",
417 .data
= reboot_command
,
420 .proc_handler
= &proc_dostring
,
421 .strategy
= &sysctl_string
,
424 .ctl_name
= KERN_SPARC_STOP_A
,
425 .procname
= "stop-a",
426 .data
= &stop_a_enabled
,
427 .maxlen
= sizeof (int),
429 .proc_handler
= &proc_dointvec
,
432 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
433 .procname
= "scons-poweroff",
434 .data
= &scons_pwroff
,
435 .maxlen
= sizeof (int),
437 .proc_handler
= &proc_dointvec
,
442 .ctl_name
= KERN_HPPA_PWRSW
,
443 .procname
= "soft-power",
444 .data
= &pwrsw_enabled
,
445 .maxlen
= sizeof (int),
447 .proc_handler
= &proc_dointvec
,
450 .ctl_name
= KERN_HPPA_UNALIGNED
,
451 .procname
= "unaligned-trap",
452 .data
= &unaligned_enabled
,
453 .maxlen
= sizeof (int),
455 .proc_handler
= &proc_dointvec
,
459 .ctl_name
= KERN_CTLALTDEL
,
460 .procname
= "ctrl-alt-del",
462 .maxlen
= sizeof(int),
464 .proc_handler
= &proc_dointvec
,
468 .ctl_name
= KERN_MODPROBE
,
469 .procname
= "modprobe",
470 .data
= &modprobe_path
,
471 .maxlen
= KMOD_PATH_LEN
,
473 .proc_handler
= &proc_dostring
,
474 .strategy
= &sysctl_string
,
477 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
479 .ctl_name
= KERN_HOTPLUG
,
480 .procname
= "hotplug",
481 .data
= &uevent_helper
,
482 .maxlen
= UEVENT_HELPER_PATH_LEN
,
484 .proc_handler
= &proc_dostring
,
485 .strategy
= &sysctl_string
,
488 #ifdef CONFIG_CHR_DEV_SG
490 .ctl_name
= KERN_SG_BIG_BUFF
,
491 .procname
= "sg-big-buff",
492 .data
= &sg_big_buff
,
493 .maxlen
= sizeof (int),
495 .proc_handler
= &proc_dointvec
,
498 #ifdef CONFIG_BSD_PROCESS_ACCT
500 .ctl_name
= KERN_ACCT
,
503 .maxlen
= 3*sizeof(int),
505 .proc_handler
= &proc_dointvec
,
508 #ifdef CONFIG_MAGIC_SYSRQ
510 .ctl_name
= KERN_SYSRQ
,
512 .data
= &__sysrq_enabled
,
513 .maxlen
= sizeof (int),
515 .proc_handler
= &proc_dointvec
,
518 #ifdef CONFIG_PROC_SYSCTL
520 .procname
= "cad_pid",
522 .maxlen
= sizeof (int),
524 .proc_handler
= &proc_do_cad_pid
,
528 .ctl_name
= KERN_MAX_THREADS
,
529 .procname
= "threads-max",
530 .data
= &max_threads
,
531 .maxlen
= sizeof(int),
533 .proc_handler
= &proc_dointvec
,
536 .ctl_name
= KERN_RANDOM
,
537 .procname
= "random",
539 .child
= random_table
,
542 .ctl_name
= KERN_OVERFLOWUID
,
543 .procname
= "overflowuid",
544 .data
= &overflowuid
,
545 .maxlen
= sizeof(int),
547 .proc_handler
= &proc_dointvec_minmax
,
548 .strategy
= &sysctl_intvec
,
549 .extra1
= &minolduid
,
550 .extra2
= &maxolduid
,
553 .ctl_name
= KERN_OVERFLOWGID
,
554 .procname
= "overflowgid",
555 .data
= &overflowgid
,
556 .maxlen
= sizeof(int),
558 .proc_handler
= &proc_dointvec_minmax
,
559 .strategy
= &sysctl_intvec
,
560 .extra1
= &minolduid
,
561 .extra2
= &maxolduid
,
564 #ifdef CONFIG_MATHEMU
566 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
567 .procname
= "ieee_emulation_warnings",
568 .data
= &sysctl_ieee_emulation_warnings
,
569 .maxlen
= sizeof(int),
571 .proc_handler
= &proc_dointvec
,
574 #ifdef CONFIG_NO_IDLE_HZ
576 .ctl_name
= KERN_HZ_TIMER
,
577 .procname
= "hz_timer",
578 .data
= &sysctl_hz_timer
,
579 .maxlen
= sizeof(int),
581 .proc_handler
= &proc_dointvec
,
585 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
586 .procname
= "userprocess_debug",
587 .data
= &sysctl_userprocess_debug
,
588 .maxlen
= sizeof(int),
590 .proc_handler
= &proc_dointvec
,
594 .ctl_name
= KERN_PIDMAX
,
595 .procname
= "pid_max",
597 .maxlen
= sizeof (int),
599 .proc_handler
= &proc_dointvec_minmax
,
600 .strategy
= sysctl_intvec
,
601 .extra1
= &pid_max_min
,
602 .extra2
= &pid_max_max
,
605 .ctl_name
= KERN_PANIC_ON_OOPS
,
606 .procname
= "panic_on_oops",
607 .data
= &panic_on_oops
,
608 .maxlen
= sizeof(int),
610 .proc_handler
= &proc_dointvec
,
612 #if defined CONFIG_PRINTK
614 .ctl_name
= KERN_PRINTK
,
615 .procname
= "printk",
616 .data
= &console_loglevel
,
617 .maxlen
= 4*sizeof(int),
619 .proc_handler
= &proc_dointvec
,
622 .ctl_name
= KERN_PRINTK_RATELIMIT
,
623 .procname
= "printk_ratelimit",
624 .data
= &printk_ratelimit_jiffies
,
625 .maxlen
= sizeof(int),
627 .proc_handler
= &proc_dointvec_jiffies
,
628 .strategy
= &sysctl_jiffies
,
631 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
632 .procname
= "printk_ratelimit_burst",
633 .data
= &printk_ratelimit_burst
,
634 .maxlen
= sizeof(int),
636 .proc_handler
= &proc_dointvec
,
640 .ctl_name
= KERN_NGROUPS_MAX
,
641 .procname
= "ngroups_max",
642 .data
= &ngroups_max
,
643 .maxlen
= sizeof (int),
645 .proc_handler
= &proc_dointvec
,
647 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
649 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
650 .procname
= "unknown_nmi_panic",
651 .data
= &unknown_nmi_panic
,
652 .maxlen
= sizeof (int),
654 .proc_handler
= &proc_dointvec
,
657 .procname
= "nmi_watchdog",
658 .data
= &nmi_watchdog_enabled
,
659 .maxlen
= sizeof (int),
661 .proc_handler
= &proc_nmi_enabled
,
664 #if defined(CONFIG_X86)
666 .ctl_name
= KERN_PANIC_ON_NMI
,
667 .procname
= "panic_on_unrecovered_nmi",
668 .data
= &panic_on_unrecovered_nmi
,
669 .maxlen
= sizeof(int),
671 .proc_handler
= &proc_dointvec
,
674 .ctl_name
= KERN_BOOTLOADER_TYPE
,
675 .procname
= "bootloader_type",
676 .data
= &bootloader_type
,
677 .maxlen
= sizeof (int),
679 .proc_handler
= &proc_dointvec
,
682 .ctl_name
= CTL_UNNUMBERED
,
683 .procname
= "kstack_depth_to_print",
684 .data
= &kstack_depth_to_print
,
685 .maxlen
= sizeof(int),
687 .proc_handler
= &proc_dointvec
,
690 .ctl_name
= CTL_UNNUMBERED
,
691 .procname
= "io_delay_type",
692 .data
= &io_delay_type
,
693 .maxlen
= sizeof(int),
695 .proc_handler
= &proc_dointvec
,
698 #if defined(CONFIG_MMU)
700 .ctl_name
= KERN_RANDOMIZE
,
701 .procname
= "randomize_va_space",
702 .data
= &randomize_va_space
,
703 .maxlen
= sizeof(int),
705 .proc_handler
= &proc_dointvec
,
708 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
710 .ctl_name
= KERN_SPIN_RETRY
,
711 .procname
= "spin_retry",
713 .maxlen
= sizeof (int),
715 .proc_handler
= &proc_dointvec
,
718 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
720 .procname
= "acpi_video_flags",
721 .data
= &acpi_realmode_flags
,
722 .maxlen
= sizeof (unsigned long),
724 .proc_handler
= &proc_doulongvec_minmax
,
729 .ctl_name
= KERN_IA64_UNALIGNED
,
730 .procname
= "ignore-unaligned-usertrap",
731 .data
= &no_unaligned_warning
,
732 .maxlen
= sizeof (int),
734 .proc_handler
= &proc_dointvec
,
737 #ifdef CONFIG_DETECT_SOFTLOCKUP
739 .ctl_name
= CTL_UNNUMBERED
,
740 .procname
= "softlockup_thresh",
741 .data
= &softlockup_thresh
,
742 .maxlen
= sizeof(unsigned long),
744 .proc_handler
= &proc_doulongvec_minmax
,
745 .strategy
= &sysctl_intvec
,
750 .ctl_name
= CTL_UNNUMBERED
,
751 .procname
= "hung_task_check_count",
752 .data
= &sysctl_hung_task_check_count
,
753 .maxlen
= sizeof(unsigned long),
755 .proc_handler
= &proc_doulongvec_minmax
,
756 .strategy
= &sysctl_intvec
,
759 .ctl_name
= CTL_UNNUMBERED
,
760 .procname
= "hung_task_timeout_secs",
761 .data
= &sysctl_hung_task_timeout_secs
,
762 .maxlen
= sizeof(unsigned long),
764 .proc_handler
= &proc_doulongvec_minmax
,
765 .strategy
= &sysctl_intvec
,
768 .ctl_name
= CTL_UNNUMBERED
,
769 .procname
= "hung_task_warnings",
770 .data
= &sysctl_hung_task_warnings
,
771 .maxlen
= sizeof(unsigned long),
773 .proc_handler
= &proc_doulongvec_minmax
,
774 .strategy
= &sysctl_intvec
,
779 .ctl_name
= KERN_COMPAT_LOG
,
780 .procname
= "compat-log",
782 .maxlen
= sizeof (int),
784 .proc_handler
= &proc_dointvec
,
787 #ifdef CONFIG_RT_MUTEXES
789 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
790 .procname
= "max_lock_depth",
791 .data
= &max_lock_depth
,
792 .maxlen
= sizeof(int),
794 .proc_handler
= &proc_dointvec
,
797 #ifdef CONFIG_PROC_FS
799 .ctl_name
= CTL_UNNUMBERED
,
800 .procname
= "maps_protect",
801 .data
= &maps_protect
,
802 .maxlen
= sizeof(int),
804 .proc_handler
= &proc_dointvec
,
808 .ctl_name
= CTL_UNNUMBERED
,
809 .procname
= "poweroff_cmd",
810 .data
= &poweroff_cmd
,
811 .maxlen
= POWEROFF_CMD_PATH_LEN
,
813 .proc_handler
= &proc_dostring
,
814 .strategy
= &sysctl_string
,
818 .ctl_name
= CTL_UNNUMBERED
,
821 .child
= key_sysctls
,
825 * NOTE: do not add new entries to this table unless you have read
826 * Documentation/sysctl/ctl_unnumbered.txt
831 static struct ctl_table vm_table
[] = {
833 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
834 .procname
= "overcommit_memory",
835 .data
= &sysctl_overcommit_memory
,
836 .maxlen
= sizeof(sysctl_overcommit_memory
),
838 .proc_handler
= &proc_dointvec
,
841 .ctl_name
= VM_PANIC_ON_OOM
,
842 .procname
= "panic_on_oom",
843 .data
= &sysctl_panic_on_oom
,
844 .maxlen
= sizeof(sysctl_panic_on_oom
),
846 .proc_handler
= &proc_dointvec
,
849 .ctl_name
= CTL_UNNUMBERED
,
850 .procname
= "oom_kill_allocating_task",
851 .data
= &sysctl_oom_kill_allocating_task
,
852 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
854 .proc_handler
= &proc_dointvec
,
857 .ctl_name
= CTL_UNNUMBERED
,
858 .procname
= "oom_dump_tasks",
859 .data
= &sysctl_oom_dump_tasks
,
860 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
862 .proc_handler
= &proc_dointvec
,
865 .ctl_name
= VM_OVERCOMMIT_RATIO
,
866 .procname
= "overcommit_ratio",
867 .data
= &sysctl_overcommit_ratio
,
868 .maxlen
= sizeof(sysctl_overcommit_ratio
),
870 .proc_handler
= &proc_dointvec
,
873 .ctl_name
= VM_PAGE_CLUSTER
,
874 .procname
= "page-cluster",
875 .data
= &page_cluster
,
876 .maxlen
= sizeof(int),
878 .proc_handler
= &proc_dointvec
,
881 .ctl_name
= VM_DIRTY_BACKGROUND
,
882 .procname
= "dirty_background_ratio",
883 .data
= &dirty_background_ratio
,
884 .maxlen
= sizeof(dirty_background_ratio
),
886 .proc_handler
= &proc_dointvec_minmax
,
887 .strategy
= &sysctl_intvec
,
889 .extra2
= &one_hundred
,
892 .ctl_name
= VM_DIRTY_RATIO
,
893 .procname
= "dirty_ratio",
894 .data
= &vm_dirty_ratio
,
895 .maxlen
= sizeof(vm_dirty_ratio
),
897 .proc_handler
= &dirty_ratio_handler
,
898 .strategy
= &sysctl_intvec
,
900 .extra2
= &one_hundred
,
903 .procname
= "dirty_writeback_centisecs",
904 .data
= &dirty_writeback_interval
,
905 .maxlen
= sizeof(dirty_writeback_interval
),
907 .proc_handler
= &dirty_writeback_centisecs_handler
,
910 .procname
= "dirty_expire_centisecs",
911 .data
= &dirty_expire_interval
,
912 .maxlen
= sizeof(dirty_expire_interval
),
914 .proc_handler
= &proc_dointvec_userhz_jiffies
,
917 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
918 .procname
= "nr_pdflush_threads",
919 .data
= &nr_pdflush_threads
,
920 .maxlen
= sizeof nr_pdflush_threads
,
921 .mode
= 0444 /* read-only*/,
922 .proc_handler
= &proc_dointvec
,
925 .ctl_name
= VM_SWAPPINESS
,
926 .procname
= "swappiness",
927 .data
= &vm_swappiness
,
928 .maxlen
= sizeof(vm_swappiness
),
930 .proc_handler
= &proc_dointvec_minmax
,
931 .strategy
= &sysctl_intvec
,
933 .extra2
= &one_hundred
,
935 #ifdef CONFIG_HUGETLB_PAGE
937 .procname
= "nr_hugepages",
938 .data
= &max_huge_pages
,
939 .maxlen
= sizeof(unsigned long),
941 .proc_handler
= &hugetlb_sysctl_handler
,
942 .extra1
= (void *)&hugetlb_zero
,
943 .extra2
= (void *)&hugetlb_infinity
,
946 .ctl_name
= VM_HUGETLB_GROUP
,
947 .procname
= "hugetlb_shm_group",
948 .data
= &sysctl_hugetlb_shm_group
,
949 .maxlen
= sizeof(gid_t
),
951 .proc_handler
= &proc_dointvec
,
954 .ctl_name
= CTL_UNNUMBERED
,
955 .procname
= "hugepages_treat_as_movable",
956 .data
= &hugepages_treat_as_movable
,
957 .maxlen
= sizeof(int),
959 .proc_handler
= &hugetlb_treat_movable_handler
,
962 .ctl_name
= CTL_UNNUMBERED
,
963 .procname
= "nr_overcommit_hugepages",
964 .data
= &sysctl_overcommit_huge_pages
,
965 .maxlen
= sizeof(sysctl_overcommit_huge_pages
),
967 .proc_handler
= &hugetlb_overcommit_handler
,
971 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
972 .procname
= "lowmem_reserve_ratio",
973 .data
= &sysctl_lowmem_reserve_ratio
,
974 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
976 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
977 .strategy
= &sysctl_intvec
,
980 .ctl_name
= VM_DROP_PAGECACHE
,
981 .procname
= "drop_caches",
982 .data
= &sysctl_drop_caches
,
983 .maxlen
= sizeof(int),
985 .proc_handler
= drop_caches_sysctl_handler
,
986 .strategy
= &sysctl_intvec
,
989 .ctl_name
= VM_MIN_FREE_KBYTES
,
990 .procname
= "min_free_kbytes",
991 .data
= &min_free_kbytes
,
992 .maxlen
= sizeof(min_free_kbytes
),
994 .proc_handler
= &min_free_kbytes_sysctl_handler
,
995 .strategy
= &sysctl_intvec
,
999 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1000 .procname
= "percpu_pagelist_fraction",
1001 .data
= &percpu_pagelist_fraction
,
1002 .maxlen
= sizeof(percpu_pagelist_fraction
),
1004 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1005 .strategy
= &sysctl_intvec
,
1006 .extra1
= &min_percpu_pagelist_fract
,
1010 .ctl_name
= VM_MAX_MAP_COUNT
,
1011 .procname
= "max_map_count",
1012 .data
= &sysctl_max_map_count
,
1013 .maxlen
= sizeof(sysctl_max_map_count
),
1015 .proc_handler
= &proc_dointvec
1019 .ctl_name
= VM_LAPTOP_MODE
,
1020 .procname
= "laptop_mode",
1021 .data
= &laptop_mode
,
1022 .maxlen
= sizeof(laptop_mode
),
1024 .proc_handler
= &proc_dointvec_jiffies
,
1025 .strategy
= &sysctl_jiffies
,
1028 .ctl_name
= VM_BLOCK_DUMP
,
1029 .procname
= "block_dump",
1030 .data
= &block_dump
,
1031 .maxlen
= sizeof(block_dump
),
1033 .proc_handler
= &proc_dointvec
,
1034 .strategy
= &sysctl_intvec
,
1038 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1039 .procname
= "vfs_cache_pressure",
1040 .data
= &sysctl_vfs_cache_pressure
,
1041 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1043 .proc_handler
= &proc_dointvec
,
1044 .strategy
= &sysctl_intvec
,
1047 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1049 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1050 .procname
= "legacy_va_layout",
1051 .data
= &sysctl_legacy_va_layout
,
1052 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1054 .proc_handler
= &proc_dointvec
,
1055 .strategy
= &sysctl_intvec
,
1061 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1062 .procname
= "zone_reclaim_mode",
1063 .data
= &zone_reclaim_mode
,
1064 .maxlen
= sizeof(zone_reclaim_mode
),
1066 .proc_handler
= &proc_dointvec
,
1067 .strategy
= &sysctl_intvec
,
1071 .ctl_name
= VM_MIN_UNMAPPED
,
1072 .procname
= "min_unmapped_ratio",
1073 .data
= &sysctl_min_unmapped_ratio
,
1074 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1076 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1077 .strategy
= &sysctl_intvec
,
1079 .extra2
= &one_hundred
,
1082 .ctl_name
= VM_MIN_SLAB
,
1083 .procname
= "min_slab_ratio",
1084 .data
= &sysctl_min_slab_ratio
,
1085 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1087 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1088 .strategy
= &sysctl_intvec
,
1090 .extra2
= &one_hundred
,
1095 .ctl_name
= CTL_UNNUMBERED
,
1096 .procname
= "stat_interval",
1097 .data
= &sysctl_stat_interval
,
1098 .maxlen
= sizeof(sysctl_stat_interval
),
1100 .proc_handler
= &proc_dointvec_jiffies
,
1101 .strategy
= &sysctl_jiffies
,
1104 #ifdef CONFIG_SECURITY
1106 .ctl_name
= CTL_UNNUMBERED
,
1107 .procname
= "mmap_min_addr",
1108 .data
= &mmap_min_addr
,
1109 .maxlen
= sizeof(unsigned long),
1111 .proc_handler
= &proc_doulongvec_minmax
,
1116 .ctl_name
= CTL_UNNUMBERED
,
1117 .procname
= "numa_zonelist_order",
1118 .data
= &numa_zonelist_order
,
1119 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1121 .proc_handler
= &numa_zonelist_order_handler
,
1122 .strategy
= &sysctl_string
,
1125 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1126 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1128 .ctl_name
= VM_VDSO_ENABLED
,
1129 .procname
= "vdso_enabled",
1130 .data
= &vdso_enabled
,
1131 .maxlen
= sizeof(vdso_enabled
),
1133 .proc_handler
= &proc_dointvec
,
1134 .strategy
= &sysctl_intvec
,
1138 #ifdef CONFIG_HIGHMEM
1140 .ctl_name
= CTL_UNNUMBERED
,
1141 .procname
= "highmem_is_dirtyable",
1142 .data
= &vm_highmem_is_dirtyable
,
1143 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1145 .proc_handler
= &proc_dointvec_minmax
,
1146 .strategy
= &sysctl_intvec
,
1152 * NOTE: do not add new entries to this table unless you have read
1153 * Documentation/sysctl/ctl_unnumbered.txt
1158 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1159 static struct ctl_table binfmt_misc_table
[] = {
1164 static struct ctl_table fs_table
[] = {
1166 .ctl_name
= FS_NRINODE
,
1167 .procname
= "inode-nr",
1168 .data
= &inodes_stat
,
1169 .maxlen
= 2*sizeof(int),
1171 .proc_handler
= &proc_dointvec
,
1174 .ctl_name
= FS_STATINODE
,
1175 .procname
= "inode-state",
1176 .data
= &inodes_stat
,
1177 .maxlen
= 7*sizeof(int),
1179 .proc_handler
= &proc_dointvec
,
1182 .procname
= "file-nr",
1183 .data
= &files_stat
,
1184 .maxlen
= 3*sizeof(int),
1186 .proc_handler
= &proc_nr_files
,
1189 .ctl_name
= FS_MAXFILE
,
1190 .procname
= "file-max",
1191 .data
= &files_stat
.max_files
,
1192 .maxlen
= sizeof(int),
1194 .proc_handler
= &proc_dointvec
,
1197 .ctl_name
= CTL_UNNUMBERED
,
1198 .procname
= "nr_open",
1199 .data
= &sysctl_nr_open
,
1200 .maxlen
= sizeof(int),
1202 .proc_handler
= &proc_dointvec_minmax
,
1203 .extra1
= &sysctl_nr_open_min
,
1204 .extra2
= &sysctl_nr_open_max
,
1207 .ctl_name
= FS_DENTRY
,
1208 .procname
= "dentry-state",
1209 .data
= &dentry_stat
,
1210 .maxlen
= 6*sizeof(int),
1212 .proc_handler
= &proc_dointvec
,
1215 .ctl_name
= FS_OVERFLOWUID
,
1216 .procname
= "overflowuid",
1217 .data
= &fs_overflowuid
,
1218 .maxlen
= sizeof(int),
1220 .proc_handler
= &proc_dointvec_minmax
,
1221 .strategy
= &sysctl_intvec
,
1222 .extra1
= &minolduid
,
1223 .extra2
= &maxolduid
,
1226 .ctl_name
= FS_OVERFLOWGID
,
1227 .procname
= "overflowgid",
1228 .data
= &fs_overflowgid
,
1229 .maxlen
= sizeof(int),
1231 .proc_handler
= &proc_dointvec_minmax
,
1232 .strategy
= &sysctl_intvec
,
1233 .extra1
= &minolduid
,
1234 .extra2
= &maxolduid
,
1237 .ctl_name
= FS_LEASES
,
1238 .procname
= "leases-enable",
1239 .data
= &leases_enable
,
1240 .maxlen
= sizeof(int),
1242 .proc_handler
= &proc_dointvec
,
1244 #ifdef CONFIG_DNOTIFY
1246 .ctl_name
= FS_DIR_NOTIFY
,
1247 .procname
= "dir-notify-enable",
1248 .data
= &dir_notify_enable
,
1249 .maxlen
= sizeof(int),
1251 .proc_handler
= &proc_dointvec
,
1256 .ctl_name
= FS_LEASE_TIME
,
1257 .procname
= "lease-break-time",
1258 .data
= &lease_break_time
,
1259 .maxlen
= sizeof(int),
1261 .proc_handler
= &proc_dointvec_minmax
,
1262 .strategy
= &sysctl_intvec
,
1267 .procname
= "aio-nr",
1269 .maxlen
= sizeof(aio_nr
),
1271 .proc_handler
= &proc_doulongvec_minmax
,
1274 .procname
= "aio-max-nr",
1275 .data
= &aio_max_nr
,
1276 .maxlen
= sizeof(aio_max_nr
),
1278 .proc_handler
= &proc_doulongvec_minmax
,
1280 #ifdef CONFIG_INOTIFY_USER
1282 .ctl_name
= FS_INOTIFY
,
1283 .procname
= "inotify",
1285 .child
= inotify_table
,
1290 .ctl_name
= KERN_SETUID_DUMPABLE
,
1291 .procname
= "suid_dumpable",
1292 .data
= &suid_dumpable
,
1293 .maxlen
= sizeof(int),
1295 .proc_handler
= &proc_dointvec
,
1297 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1299 .ctl_name
= CTL_UNNUMBERED
,
1300 .procname
= "binfmt_misc",
1302 .child
= binfmt_misc_table
,
1306 * NOTE: do not add new entries to this table unless you have read
1307 * Documentation/sysctl/ctl_unnumbered.txt
1312 static struct ctl_table debug_table
[] = {
1313 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1315 .ctl_name
= CTL_UNNUMBERED
,
1316 .procname
= "exception-trace",
1317 .data
= &show_unhandled_signals
,
1318 .maxlen
= sizeof(int),
1320 .proc_handler
= proc_dointvec
1326 static struct ctl_table dev_table
[] = {
1330 static DEFINE_SPINLOCK(sysctl_lock
);
1332 /* called under sysctl_lock */
1333 static int use_table(struct ctl_table_header
*p
)
1335 if (unlikely(p
->unregistering
))
1341 /* called under sysctl_lock */
1342 static void unuse_table(struct ctl_table_header
*p
)
1345 if (unlikely(p
->unregistering
))
1346 complete(p
->unregistering
);
1349 /* called under sysctl_lock, will reacquire if has to wait */
1350 static void start_unregistering(struct ctl_table_header
*p
)
1353 * if p->used is 0, nobody will ever touch that entry again;
1354 * we'll eliminate all paths to it before dropping sysctl_lock
1356 if (unlikely(p
->used
)) {
1357 struct completion wait
;
1358 init_completion(&wait
);
1359 p
->unregistering
= &wait
;
1360 spin_unlock(&sysctl_lock
);
1361 wait_for_completion(&wait
);
1362 spin_lock(&sysctl_lock
);
1365 * do not remove from the list until nobody holds it; walking the
1366 * list in do_sysctl() relies on that.
1368 list_del_init(&p
->ctl_entry
);
1371 void sysctl_head_finish(struct ctl_table_header
*head
)
1375 spin_lock(&sysctl_lock
);
1377 spin_unlock(&sysctl_lock
);
1380 static struct list_head
*
1381 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1383 struct list_head
*header_list
;
1384 header_list
= &root
->header_list
;
1386 header_list
= root
->lookup(root
, namespaces
);
1390 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1391 struct ctl_table_header
*prev
)
1393 struct ctl_table_root
*root
;
1394 struct list_head
*header_list
;
1395 struct ctl_table_header
*head
;
1396 struct list_head
*tmp
;
1398 spin_lock(&sysctl_lock
);
1401 tmp
= &prev
->ctl_entry
;
1405 tmp
= &root_table_header
.ctl_entry
;
1407 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1409 if (!use_table(head
))
1411 spin_unlock(&sysctl_lock
);
1416 header_list
= lookup_header_list(root
, namespaces
);
1417 if (tmp
!= header_list
)
1421 root
= list_entry(root
->root_list
.next
,
1422 struct ctl_table_root
, root_list
);
1423 if (root
== &sysctl_table_root
)
1425 header_list
= lookup_header_list(root
, namespaces
);
1426 } while (list_empty(header_list
));
1427 tmp
= header_list
->next
;
1430 spin_unlock(&sysctl_lock
);
1434 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1436 return __sysctl_head_next(current
->nsproxy
, prev
);
1439 void register_sysctl_root(struct ctl_table_root
*root
)
1441 spin_lock(&sysctl_lock
);
1442 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1443 spin_unlock(&sysctl_lock
);
1446 #ifdef CONFIG_SYSCTL_SYSCALL
1447 /* Perform the actual read/write of a sysctl table entry. */
1448 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1449 struct ctl_table
*table
,
1450 int __user
*name
, int nlen
,
1451 void __user
*oldval
, size_t __user
*oldlenp
,
1452 void __user
*newval
, size_t newlen
)
1460 if (sysctl_perm(root
, table
, op
))
1463 if (table
->strategy
) {
1464 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1472 /* If there is no strategy routine, or if the strategy returns
1473 * zero, proceed with automatic r/w */
1474 if (table
->data
&& table
->maxlen
) {
1475 rc
= sysctl_data(table
, name
, nlen
, oldval
, oldlenp
,
1483 static int parse_table(int __user
*name
, int nlen
,
1484 void __user
*oldval
, size_t __user
*oldlenp
,
1485 void __user
*newval
, size_t newlen
,
1486 struct ctl_table_root
*root
,
1487 struct ctl_table
*table
)
1493 if (get_user(n
, name
))
1495 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1496 if (!table
->ctl_name
)
1498 if (n
== table
->ctl_name
) {
1501 if (sysctl_perm(root
, table
, 001))
1505 table
= table
->child
;
1508 error
= do_sysctl_strategy(root
, table
, name
, nlen
,
1517 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1518 void __user
*newval
, size_t newlen
)
1520 struct ctl_table_header
*head
;
1521 int error
= -ENOTDIR
;
1523 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1527 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1531 for (head
= sysctl_head_next(NULL
); head
;
1532 head
= sysctl_head_next(head
)) {
1533 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1535 head
->root
, head
->ctl_table
);
1536 if (error
!= -ENOTDIR
) {
1537 sysctl_head_finish(head
);
1544 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1546 struct __sysctl_args tmp
;
1549 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1552 error
= deprecated_sysctl_warning(&tmp
);
1557 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1558 tmp
.newval
, tmp
.newlen
);
1563 #endif /* CONFIG_SYSCTL_SYSCALL */
1566 * sysctl_perm does NOT grant the superuser all rights automatically, because
1567 * some sysctl variables are readonly even to root.
1570 static int test_perm(int mode
, int op
)
1574 else if (in_egroup_p(0))
1576 if ((mode
& op
& 0007) == op
)
1581 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1586 error
= security_sysctl(table
, op
);
1590 if (root
->permissions
)
1591 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1595 return test_perm(mode
, op
);
1598 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1600 for (; table
->ctl_name
|| table
->procname
; table
++) {
1601 table
->parent
= parent
;
1603 sysctl_set_parent(table
, table
->child
);
1607 static __init
int sysctl_init(void)
1609 sysctl_set_parent(NULL
, root_table
);
1610 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1613 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1619 core_initcall(sysctl_init
);
1622 * __register_sysctl_paths - register a sysctl hierarchy
1623 * @root: List of sysctl headers to register on
1624 * @namespaces: Data to compute which lists of sysctl entries are visible
1625 * @path: The path to the directory the sysctl table is in.
1626 * @table: the top-level table structure
1628 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1629 * array. A completely 0 filled entry terminates the table.
1631 * The members of the &struct ctl_table structure are used as follows:
1633 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1634 * must be unique within that level of sysctl
1636 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1637 * enter a sysctl file
1639 * data - a pointer to data for use by proc_handler
1641 * maxlen - the maximum size in bytes of the data
1643 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1645 * child - a pointer to the child sysctl table if this entry is a directory, or
1648 * proc_handler - the text handler routine (described below)
1650 * strategy - the strategy routine (described below)
1652 * de - for internal use by the sysctl routines
1654 * extra1, extra2 - extra pointers usable by the proc handler routines
1656 * Leaf nodes in the sysctl tree will be represented by a single file
1657 * under /proc; non-leaf nodes will be represented by directories.
1659 * sysctl(2) can automatically manage read and write requests through
1660 * the sysctl table. The data and maxlen fields of the ctl_table
1661 * struct enable minimal validation of the values being written to be
1662 * performed, and the mode field allows minimal authentication.
1664 * More sophisticated management can be enabled by the provision of a
1665 * strategy routine with the table entry. This will be called before
1666 * any automatic read or write of the data is performed.
1668 * The strategy routine may return
1670 * < 0 - Error occurred (error is passed to user process)
1672 * 0 - OK - proceed with automatic read or write.
1674 * > 0 - OK - read or write has been done by the strategy routine, so
1675 * return immediately.
1677 * There must be a proc_handler routine for any terminal nodes
1678 * mirrored under /proc/sys (non-terminals are handled by a built-in
1679 * directory handler). Several default handlers are available to
1680 * cover common cases -
1682 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1683 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1684 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1686 * It is the handler's job to read the input buffer from user memory
1687 * and process it. The handler should return 0 on success.
1689 * This routine returns %NULL on a failure to register, and a pointer
1690 * to the table header on success.
1692 struct ctl_table_header
*__register_sysctl_paths(
1693 struct ctl_table_root
*root
,
1694 struct nsproxy
*namespaces
,
1695 const struct ctl_path
*path
, struct ctl_table
*table
)
1697 struct list_head
*header_list
;
1698 struct ctl_table_header
*header
;
1699 struct ctl_table
*new, **prevp
;
1700 unsigned int n
, npath
;
1702 /* Count the path components */
1703 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1707 * For each path component, allocate a 2-element ctl_table array.
1708 * The first array element will be filled with the sysctl entry
1709 * for this, the second will be the sentinel (ctl_name == 0).
1711 * We allocate everything in one go so that we don't have to
1712 * worry about freeing additional memory in unregister_sysctl_table.
1714 header
= kzalloc(sizeof(struct ctl_table_header
) +
1715 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1719 new = (struct ctl_table
*) (header
+ 1);
1721 /* Now connect the dots */
1722 prevp
= &header
->ctl_table
;
1723 for (n
= 0; n
< npath
; ++n
, ++path
) {
1724 /* Copy the procname */
1725 new->procname
= path
->procname
;
1726 new->ctl_name
= path
->ctl_name
;
1730 prevp
= &new->child
;
1735 header
->ctl_table_arg
= table
;
1737 INIT_LIST_HEAD(&header
->ctl_entry
);
1739 header
->unregistering
= NULL
;
1740 header
->root
= root
;
1741 sysctl_set_parent(NULL
, header
->ctl_table
);
1742 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1743 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
1748 spin_lock(&sysctl_lock
);
1749 header_list
= lookup_header_list(root
, namespaces
);
1750 list_add_tail(&header
->ctl_entry
, header_list
);
1751 spin_unlock(&sysctl_lock
);
1757 * register_sysctl_table_path - register a sysctl table hierarchy
1758 * @path: The path to the directory the sysctl table is in.
1759 * @table: the top-level table structure
1761 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1762 * array. A completely 0 filled entry terminates the table.
1764 * See __register_sysctl_paths for more details.
1766 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1767 struct ctl_table
*table
)
1769 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
1774 * register_sysctl_table - register a sysctl table hierarchy
1775 * @table: the top-level table structure
1777 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1778 * array. A completely 0 filled entry terminates the table.
1780 * See register_sysctl_paths for more details.
1782 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
1784 static const struct ctl_path null_path
[] = { {} };
1786 return register_sysctl_paths(null_path
, table
);
1790 * unregister_sysctl_table - unregister a sysctl table hierarchy
1791 * @header: the header returned from register_sysctl_table
1793 * Unregisters the sysctl table and all children. proc entries may not
1794 * actually be removed until they are no longer used by anyone.
1796 void unregister_sysctl_table(struct ctl_table_header
* header
)
1803 spin_lock(&sysctl_lock
);
1804 start_unregistering(header
);
1805 spin_unlock(&sysctl_lock
);
1809 #else /* !CONFIG_SYSCTL */
1810 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
1815 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1816 struct ctl_table
*table
)
1821 void unregister_sysctl_table(struct ctl_table_header
* table
)
1825 #endif /* CONFIG_SYSCTL */
1831 #ifdef CONFIG_PROC_SYSCTL
1833 static int _proc_do_string(void* data
, int maxlen
, int write
,
1834 struct file
*filp
, void __user
*buffer
,
1835 size_t *lenp
, loff_t
*ppos
)
1841 if (!data
|| !maxlen
|| !*lenp
) {
1849 while (len
< *lenp
) {
1850 if (get_user(c
, p
++))
1852 if (c
== 0 || c
== '\n')
1858 if(copy_from_user(data
, buffer
, len
))
1860 ((char *) data
)[len
] = 0;
1878 if(copy_to_user(buffer
, data
, len
))
1881 if(put_user('\n', ((char __user
*) buffer
) + len
))
1892 * proc_dostring - read a string sysctl
1893 * @table: the sysctl table
1894 * @write: %TRUE if this is a write to the sysctl file
1895 * @filp: the file structure
1896 * @buffer: the user buffer
1897 * @lenp: the size of the user buffer
1898 * @ppos: file position
1900 * Reads/writes a string from/to the user buffer. If the kernel
1901 * buffer provided is not large enough to hold the string, the
1902 * string is truncated. The copied string is %NULL-terminated.
1903 * If the string is being read by the user process, it is copied
1904 * and a newline '\n' is added. It is truncated if the buffer is
1907 * Returns 0 on success.
1909 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
1910 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1912 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1913 buffer
, lenp
, ppos
);
1917 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1919 int write
, void *data
)
1922 *valp
= *negp
? -*lvalp
: *lvalp
;
1927 *lvalp
= (unsigned long)-val
;
1930 *lvalp
= (unsigned long)val
;
1936 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1937 int write
, struct file
*filp
, void __user
*buffer
,
1938 size_t *lenp
, loff_t
*ppos
,
1939 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1940 int write
, void *data
),
1943 #define TMPBUFLEN 21
1944 int *i
, vleft
, first
=1, neg
, val
;
1948 char buf
[TMPBUFLEN
], *p
;
1949 char __user
*s
= buffer
;
1951 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1952 (*ppos
&& !write
)) {
1957 i
= (int *) tbl_data
;
1958 vleft
= table
->maxlen
/ sizeof(*i
);
1962 conv
= do_proc_dointvec_conv
;
1964 for (; left
&& vleft
--; i
++, first
=0) {
1979 if (len
> sizeof(buf
) - 1)
1980 len
= sizeof(buf
) - 1;
1981 if (copy_from_user(buf
, s
, len
))
1985 if (*p
== '-' && left
> 1) {
1989 if (*p
< '0' || *p
> '9')
1992 lval
= simple_strtoul(p
, &p
, 0);
1995 if ((len
< left
) && *p
&& !isspace(*p
))
2002 if (conv(&neg
, &lval
, i
, 1, data
))
2009 if (conv(&neg
, &lval
, i
, 0, data
))
2012 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2016 if(copy_to_user(s
, buf
, len
))
2023 if (!write
&& !first
&& left
) {
2024 if(put_user('\n', s
))
2031 if (get_user(c
, s
++))
2046 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2047 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2048 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2049 int write
, void *data
),
2052 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2053 buffer
, lenp
, ppos
, conv
, data
);
2057 * proc_dointvec - read a vector of integers
2058 * @table: the sysctl table
2059 * @write: %TRUE if this is a write to the sysctl file
2060 * @filp: the file structure
2061 * @buffer: the user buffer
2062 * @lenp: the size of the user buffer
2063 * @ppos: file position
2065 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066 * values from/to the user buffer, treated as an ASCII string.
2068 * Returns 0 on success.
2070 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2071 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2073 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2081 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
2083 int write
, void *data
)
2085 int op
= *(int *)data
;
2087 int val
= *negp
? -*lvalp
: *lvalp
;
2089 case OP_SET
: *valp
= val
; break;
2090 case OP_AND
: *valp
&= val
; break;
2091 case OP_OR
: *valp
|= val
; break;
2097 *lvalp
= (unsigned long)-val
;
2100 *lvalp
= (unsigned long)val
;
2107 * Taint values can only be increased
2109 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2110 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2114 if (write
&& !capable(CAP_SYS_ADMIN
))
2118 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2119 do_proc_dointvec_bset_conv
,&op
);
2122 struct do_proc_dointvec_minmax_conv_param
{
2127 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2129 int write
, void *data
)
2131 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2133 int val
= *negp
? -*lvalp
: *lvalp
;
2134 if ((param
->min
&& *param
->min
> val
) ||
2135 (param
->max
&& *param
->max
< val
))
2142 *lvalp
= (unsigned long)-val
;
2145 *lvalp
= (unsigned long)val
;
2152 * proc_dointvec_minmax - read a vector of integers with min/max values
2153 * @table: the sysctl table
2154 * @write: %TRUE if this is a write to the sysctl file
2155 * @filp: the file structure
2156 * @buffer: the user buffer
2157 * @lenp: the size of the user buffer
2158 * @ppos: file position
2160 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2161 * values from/to the user buffer, treated as an ASCII string.
2163 * This routine will ensure the values are within the range specified by
2164 * table->extra1 (min) and table->extra2 (max).
2166 * Returns 0 on success.
2168 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2169 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2171 struct do_proc_dointvec_minmax_conv_param param
= {
2172 .min
= (int *) table
->extra1
,
2173 .max
= (int *) table
->extra2
,
2175 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2176 do_proc_dointvec_minmax_conv
, ¶m
);
2179 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2181 void __user
*buffer
,
2182 size_t *lenp
, loff_t
*ppos
,
2183 unsigned long convmul
,
2184 unsigned long convdiv
)
2186 #define TMPBUFLEN 21
2187 unsigned long *i
, *min
, *max
, val
;
2188 int vleft
, first
=1, neg
;
2190 char buf
[TMPBUFLEN
], *p
;
2191 char __user
*s
= buffer
;
2193 if (!data
|| !table
->maxlen
|| !*lenp
||
2194 (*ppos
&& !write
)) {
2199 i
= (unsigned long *) data
;
2200 min
= (unsigned long *) table
->extra1
;
2201 max
= (unsigned long *) table
->extra2
;
2202 vleft
= table
->maxlen
/ sizeof(unsigned long);
2205 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2220 if (len
> TMPBUFLEN
-1)
2222 if (copy_from_user(buf
, s
, len
))
2226 if (*p
== '-' && left
> 1) {
2230 if (*p
< '0' || *p
> '9')
2232 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2234 if ((len
< left
) && *p
&& !isspace(*p
))
2243 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2250 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2254 if(copy_to_user(s
, buf
, len
))
2261 if (!write
&& !first
&& left
) {
2262 if(put_user('\n', s
))
2269 if (get_user(c
, s
++))
2284 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2286 void __user
*buffer
,
2287 size_t *lenp
, loff_t
*ppos
,
2288 unsigned long convmul
,
2289 unsigned long convdiv
)
2291 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2292 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2296 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2297 * @table: the sysctl table
2298 * @write: %TRUE if this is a write to the sysctl file
2299 * @filp: the file structure
2300 * @buffer: the user buffer
2301 * @lenp: the size of the user buffer
2302 * @ppos: file position
2304 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2305 * values from/to the user buffer, treated as an ASCII string.
2307 * This routine will ensure the values are within the range specified by
2308 * table->extra1 (min) and table->extra2 (max).
2310 * Returns 0 on success.
2312 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2313 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2315 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2319 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2320 * @table: the sysctl table
2321 * @write: %TRUE if this is a write to the sysctl file
2322 * @filp: the file structure
2323 * @buffer: the user buffer
2324 * @lenp: the size of the user buffer
2325 * @ppos: file position
2327 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2328 * values from/to the user buffer, treated as an ASCII string. The values
2329 * are treated as milliseconds, and converted to jiffies when they are stored.
2331 * This routine will ensure the values are within the range specified by
2332 * table->extra1 (min) and table->extra2 (max).
2334 * Returns 0 on success.
2336 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2338 void __user
*buffer
,
2339 size_t *lenp
, loff_t
*ppos
)
2341 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2342 lenp
, ppos
, HZ
, 1000l);
2346 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2348 int write
, void *data
)
2351 if (*lvalp
> LONG_MAX
/ HZ
)
2353 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2359 lval
= (unsigned long)-val
;
2362 lval
= (unsigned long)val
;
2369 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2371 int write
, void *data
)
2374 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2376 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2382 lval
= (unsigned long)-val
;
2385 lval
= (unsigned long)val
;
2387 *lvalp
= jiffies_to_clock_t(lval
);
2392 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2394 int write
, void *data
)
2397 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2403 lval
= (unsigned long)-val
;
2406 lval
= (unsigned long)val
;
2408 *lvalp
= jiffies_to_msecs(lval
);
2414 * proc_dointvec_jiffies - read a vector of integers as seconds
2415 * @table: the sysctl table
2416 * @write: %TRUE if this is a write to the sysctl file
2417 * @filp: the file structure
2418 * @buffer: the user buffer
2419 * @lenp: the size of the user buffer
2420 * @ppos: file position
2422 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2423 * values from/to the user buffer, treated as an ASCII string.
2424 * The values read are assumed to be in seconds, and are converted into
2427 * Returns 0 on success.
2429 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2430 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2432 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2433 do_proc_dointvec_jiffies_conv
,NULL
);
2437 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2438 * @table: the sysctl table
2439 * @write: %TRUE if this is a write to the sysctl file
2440 * @filp: the file structure
2441 * @buffer: the user buffer
2442 * @lenp: the size of the user buffer
2443 * @ppos: pointer to the file position
2445 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2446 * values from/to the user buffer, treated as an ASCII string.
2447 * The values read are assumed to be in 1/USER_HZ seconds, and
2448 * are converted into jiffies.
2450 * Returns 0 on success.
2452 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2453 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2455 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2456 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2460 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2461 * @table: the sysctl table
2462 * @write: %TRUE if this is a write to the sysctl file
2463 * @filp: the file structure
2464 * @buffer: the user buffer
2465 * @lenp: the size of the user buffer
2466 * @ppos: file position
2467 * @ppos: the current position in the file
2469 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2470 * values from/to the user buffer, treated as an ASCII string.
2471 * The values read are assumed to be in 1/1000 seconds, and
2472 * are converted into jiffies.
2474 * Returns 0 on success.
2476 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2477 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2479 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2480 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2483 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2484 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2486 struct pid
*new_pid
;
2490 tmp
= pid_vnr(cad_pid
);
2492 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2493 lenp
, ppos
, NULL
, NULL
);
2497 new_pid
= find_get_pid(tmp
);
2501 put_pid(xchg(&cad_pid
, new_pid
));
2505 #else /* CONFIG_PROC_FS */
2507 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2508 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2513 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2514 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2519 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2520 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2525 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2526 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2531 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2532 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2537 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2538 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2543 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2544 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2549 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2551 void __user
*buffer
,
2552 size_t *lenp
, loff_t
*ppos
)
2558 #endif /* CONFIG_PROC_FS */
2561 #ifdef CONFIG_SYSCTL_SYSCALL
2563 * General sysctl support routines
2566 /* The generic sysctl data routine (used if no strategy routine supplied) */
2567 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2568 void __user
*oldval
, size_t __user
*oldlenp
,
2569 void __user
*newval
, size_t newlen
)
2573 /* Get out of I don't have a variable */
2574 if (!table
->data
|| !table
->maxlen
)
2577 if (oldval
&& oldlenp
) {
2578 if (get_user(len
, oldlenp
))
2581 if (len
> table
->maxlen
)
2582 len
= table
->maxlen
;
2583 if (copy_to_user(oldval
, table
->data
, len
))
2585 if (put_user(len
, oldlenp
))
2590 if (newval
&& newlen
) {
2591 if (newlen
> table
->maxlen
)
2592 newlen
= table
->maxlen
;
2594 if (copy_from_user(table
->data
, newval
, newlen
))
2600 /* The generic string strategy routine: */
2601 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2602 void __user
*oldval
, size_t __user
*oldlenp
,
2603 void __user
*newval
, size_t newlen
)
2605 if (!table
->data
|| !table
->maxlen
)
2608 if (oldval
&& oldlenp
) {
2610 if (get_user(bufsize
, oldlenp
))
2613 size_t len
= strlen(table
->data
), copied
;
2615 /* This shouldn't trigger for a well-formed sysctl */
2616 if (len
> table
->maxlen
)
2617 len
= table
->maxlen
;
2619 /* Copy up to a max of bufsize-1 bytes of the string */
2620 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2622 if (copy_to_user(oldval
, table
->data
, copied
) ||
2623 put_user(0, (char __user
*)(oldval
+ copied
)))
2625 if (put_user(len
, oldlenp
))
2629 if (newval
&& newlen
) {
2630 size_t len
= newlen
;
2631 if (len
> table
->maxlen
)
2632 len
= table
->maxlen
;
2633 if(copy_from_user(table
->data
, newval
, len
))
2635 if (len
== table
->maxlen
)
2637 ((char *) table
->data
)[len
] = 0;
2643 * This function makes sure that all of the integers in the vector
2644 * are between the minimum and maximum values given in the arrays
2645 * table->extra1 and table->extra2, respectively.
2647 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2648 void __user
*oldval
, size_t __user
*oldlenp
,
2649 void __user
*newval
, size_t newlen
)
2652 if (newval
&& newlen
) {
2653 int __user
*vec
= (int __user
*) newval
;
2654 int *min
= (int *) table
->extra1
;
2655 int *max
= (int *) table
->extra2
;
2659 if (newlen
% sizeof(int) != 0)
2662 if (!table
->extra1
&& !table
->extra2
)
2665 if (newlen
> table
->maxlen
)
2666 newlen
= table
->maxlen
;
2667 length
= newlen
/ sizeof(int);
2669 for (i
= 0; i
< length
; i
++) {
2671 if (get_user(value
, vec
+ i
))
2673 if (min
&& value
< min
[i
])
2675 if (max
&& value
> max
[i
])
2682 /* Strategy function to convert jiffies to seconds */
2683 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2684 void __user
*oldval
, size_t __user
*oldlenp
,
2685 void __user
*newval
, size_t newlen
)
2687 if (oldval
&& oldlenp
) {
2690 if (get_user(olen
, oldlenp
))
2695 if (olen
< sizeof(int))
2698 val
= *(int *)(table
->data
) / HZ
;
2699 if (put_user(val
, (int __user
*)oldval
))
2701 if (put_user(sizeof(int), oldlenp
))
2705 if (newval
&& newlen
) {
2707 if (newlen
!= sizeof(int))
2709 if (get_user(new, (int __user
*)newval
))
2711 *(int *)(table
->data
) = new*HZ
;
2716 /* Strategy function to convert jiffies to seconds */
2717 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2718 void __user
*oldval
, size_t __user
*oldlenp
,
2719 void __user
*newval
, size_t newlen
)
2721 if (oldval
&& oldlenp
) {
2724 if (get_user(olen
, oldlenp
))
2729 if (olen
< sizeof(int))
2732 val
= jiffies_to_msecs(*(int *)(table
->data
));
2733 if (put_user(val
, (int __user
*)oldval
))
2735 if (put_user(sizeof(int), oldlenp
))
2739 if (newval
&& newlen
) {
2741 if (newlen
!= sizeof(int))
2743 if (get_user(new, (int __user
*)newval
))
2745 *(int *)(table
->data
) = msecs_to_jiffies(new);
2752 #else /* CONFIG_SYSCTL_SYSCALL */
2755 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2757 struct __sysctl_args tmp
;
2760 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2763 error
= deprecated_sysctl_warning(&tmp
);
2765 /* If no error reading the parameters then just -ENOSYS ... */
2772 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2773 void __user
*oldval
, size_t __user
*oldlenp
,
2774 void __user
*newval
, size_t newlen
)
2779 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2780 void __user
*oldval
, size_t __user
*oldlenp
,
2781 void __user
*newval
, size_t newlen
)
2786 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2787 void __user
*oldval
, size_t __user
*oldlenp
,
2788 void __user
*newval
, size_t newlen
)
2793 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2794 void __user
*oldval
, size_t __user
*oldlenp
,
2795 void __user
*newval
, size_t newlen
)
2800 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2801 void __user
*oldval
, size_t __user
*oldlenp
,
2802 void __user
*newval
, size_t newlen
)
2807 #endif /* CONFIG_SYSCTL_SYSCALL */
2809 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
2811 static int msg_count
;
2812 int name
[CTL_MAXNAME
];
2815 /* Check args->nlen. */
2816 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
2819 /* Read in the sysctl name for better debug message logging */
2820 for (i
= 0; i
< args
->nlen
; i
++)
2821 if (get_user(name
[i
], args
->name
+ i
))
2824 /* Ignore accesses to kernel.version */
2825 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2828 if (msg_count
< 5) {
2831 "warning: process `%s' used the deprecated sysctl "
2832 "system call with ", current
->comm
);
2833 for (i
= 0; i
< args
->nlen
; i
++)
2834 printk("%d.", name
[i
]);
2841 * No sense putting this after each symbol definition, twice,
2842 * exception granted :-)
2844 EXPORT_SYMBOL(proc_dointvec
);
2845 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2846 EXPORT_SYMBOL(proc_dointvec_minmax
);
2847 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2848 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2849 EXPORT_SYMBOL(proc_dostring
);
2850 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2851 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2852 EXPORT_SYMBOL(register_sysctl_table
);
2853 EXPORT_SYMBOL(register_sysctl_paths
);
2854 EXPORT_SYMBOL(sysctl_intvec
);
2855 EXPORT_SYMBOL(sysctl_jiffies
);
2856 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2857 EXPORT_SYMBOL(sysctl_string
);
2858 EXPORT_SYMBOL(sysctl_data
);
2859 EXPORT_SYMBOL(unregister_sysctl_table
);