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/security.h>
41 #include <linux/initrd.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>
58 static int deprecated_sysctl_warning(struct __sysctl_args
*args
);
60 #if defined(CONFIG_SYSCTL)
62 /* External variables not in a header file. */
64 extern int print_fatal_signals
;
65 extern int sysctl_overcommit_memory
;
66 extern int sysctl_overcommit_ratio
;
67 extern int sysctl_panic_on_oom
;
68 extern int sysctl_oom_kill_allocating_task
;
69 extern int max_threads
;
70 extern int core_uses_pid
;
71 extern int suid_dumpable
;
72 extern char core_pattern
[];
74 extern int min_free_kbytes
;
75 extern int printk_ratelimit_jiffies
;
76 extern int printk_ratelimit_burst
;
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 audit_argv_kb
;
85 /* Constants used for minimum and maximum */
86 #ifdef CONFIG_DETECT_SOFTLOCKUP
88 static int sixty
= 60;
96 static int one_hundred
= 100;
98 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
99 static int maxolduid
= 65535;
100 static int minolduid
;
101 static int min_percpu_pagelist_fract
= 8;
103 static int ngroups_max
= NGROUPS_MAX
;
106 extern char modprobe_path
[];
108 #ifdef CONFIG_CHR_DEV_SG
109 extern int sg_big_buff
;
113 extern char reboot_command
[];
114 extern int stop_a_enabled
;
115 extern int scons_pwroff
;
119 extern int pwrsw_enabled
;
120 extern int unaligned_enabled
;
124 #ifdef CONFIG_MATHEMU
125 extern int sysctl_ieee_emulation_warnings
;
127 extern int sysctl_userprocess_debug
;
128 extern int spin_retry
;
131 extern int sysctl_hz_timer
;
133 #ifdef CONFIG_BSD_PROCESS_ACCT
134 extern int acct_parm
[];
138 extern int no_unaligned_warning
;
141 #ifdef CONFIG_RT_MUTEXES
142 extern int max_lock_depth
;
145 #ifdef CONFIG_SYSCTL_SYSCALL
146 static int parse_table(int __user
*, int, void __user
*, size_t __user
*,
147 void __user
*, size_t, struct ctl_table
*);
151 #ifdef CONFIG_PROC_SYSCTL
152 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
154 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
155 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
158 static struct ctl_table root_table
[];
159 static struct ctl_table_header root_table_header
=
160 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
162 static struct ctl_table kern_table
[];
163 static struct ctl_table vm_table
[];
164 static struct ctl_table fs_table
[];
165 static struct ctl_table debug_table
[];
166 static struct ctl_table dev_table
[];
167 extern struct ctl_table random_table
[];
168 #ifdef CONFIG_INOTIFY_USER
169 extern struct ctl_table inotify_table
[];
172 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
173 int sysctl_legacy_va_layout
;
176 extern int prove_locking
;
177 extern int lock_stat
;
179 /* The default sysctl tables: */
181 static struct ctl_table root_table
[] = {
183 .ctl_name
= CTL_KERN
,
184 .procname
= "kernel",
209 .ctl_name
= CTL_DEBUG
,
212 .child
= debug_table
,
221 * NOTE: do not add new entries to this table unless you have read
222 * Documentation/sysctl/ctl_unnumbered.txt
227 #ifdef CONFIG_SCHED_DEBUG
228 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
229 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
230 static int min_wakeup_granularity_ns
; /* 0 usecs */
231 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
234 static struct ctl_table kern_table
[] = {
235 #ifdef CONFIG_SCHED_DEBUG
237 .ctl_name
= CTL_UNNUMBERED
,
238 .procname
= "sched_min_granularity_ns",
239 .data
= &sysctl_sched_min_granularity
,
240 .maxlen
= sizeof(unsigned int),
242 .proc_handler
= &sched_nr_latency_handler
,
243 .strategy
= &sysctl_intvec
,
244 .extra1
= &min_sched_granularity_ns
,
245 .extra2
= &max_sched_granularity_ns
,
248 .ctl_name
= CTL_UNNUMBERED
,
249 .procname
= "sched_latency_ns",
250 .data
= &sysctl_sched_latency
,
251 .maxlen
= sizeof(unsigned int),
253 .proc_handler
= &sched_nr_latency_handler
,
254 .strategy
= &sysctl_intvec
,
255 .extra1
= &min_sched_granularity_ns
,
256 .extra2
= &max_sched_granularity_ns
,
259 .ctl_name
= CTL_UNNUMBERED
,
260 .procname
= "sched_wakeup_granularity_ns",
261 .data
= &sysctl_sched_wakeup_granularity
,
262 .maxlen
= sizeof(unsigned int),
264 .proc_handler
= &proc_dointvec_minmax
,
265 .strategy
= &sysctl_intvec
,
266 .extra1
= &min_wakeup_granularity_ns
,
267 .extra2
= &max_wakeup_granularity_ns
,
270 .ctl_name
= CTL_UNNUMBERED
,
271 .procname
= "sched_batch_wakeup_granularity_ns",
272 .data
= &sysctl_sched_batch_wakeup_granularity
,
273 .maxlen
= sizeof(unsigned int),
275 .proc_handler
= &proc_dointvec_minmax
,
276 .strategy
= &sysctl_intvec
,
277 .extra1
= &min_wakeup_granularity_ns
,
278 .extra2
= &max_wakeup_granularity_ns
,
281 .ctl_name
= CTL_UNNUMBERED
,
282 .procname
= "sched_child_runs_first",
283 .data
= &sysctl_sched_child_runs_first
,
284 .maxlen
= sizeof(unsigned int),
286 .proc_handler
= &proc_dointvec
,
289 .ctl_name
= CTL_UNNUMBERED
,
290 .procname
= "sched_features",
291 .data
= &sysctl_sched_features
,
292 .maxlen
= sizeof(unsigned int),
294 .proc_handler
= &proc_dointvec
,
297 .ctl_name
= CTL_UNNUMBERED
,
298 .procname
= "sched_migration_cost",
299 .data
= &sysctl_sched_migration_cost
,
300 .maxlen
= sizeof(unsigned int),
302 .proc_handler
= &proc_dointvec
,
305 .ctl_name
= CTL_UNNUMBERED
,
306 .procname
= "sched_nr_migrate",
307 .data
= &sysctl_sched_nr_migrate
,
308 .maxlen
= sizeof(unsigned int),
310 .proc_handler
= &proc_dointvec
,
312 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
314 .ctl_name
= CTL_UNNUMBERED
,
315 .procname
= "sched_min_bal_int_shares",
316 .data
= &sysctl_sched_min_bal_int_shares
,
317 .maxlen
= sizeof(unsigned int),
319 .proc_handler
= &proc_dointvec
,
322 .ctl_name
= CTL_UNNUMBERED
,
323 .procname
= "sched_max_bal_int_shares",
324 .data
= &sysctl_sched_max_bal_int_shares
,
325 .maxlen
= sizeof(unsigned int),
327 .proc_handler
= &proc_dointvec
,
332 .ctl_name
= CTL_UNNUMBERED
,
333 .procname
= "sched_compat_yield",
334 .data
= &sysctl_sched_compat_yield
,
335 .maxlen
= sizeof(unsigned int),
337 .proc_handler
= &proc_dointvec
,
339 #ifdef CONFIG_PROVE_LOCKING
341 .ctl_name
= CTL_UNNUMBERED
,
342 .procname
= "prove_locking",
343 .data
= &prove_locking
,
344 .maxlen
= sizeof(int),
346 .proc_handler
= &proc_dointvec
,
349 #ifdef CONFIG_LOCK_STAT
351 .ctl_name
= CTL_UNNUMBERED
,
352 .procname
= "lock_stat",
354 .maxlen
= sizeof(int),
356 .proc_handler
= &proc_dointvec
,
360 .ctl_name
= KERN_PANIC
,
362 .data
= &panic_timeout
,
363 .maxlen
= sizeof(int),
365 .proc_handler
= &proc_dointvec
,
368 .ctl_name
= KERN_CORE_USES_PID
,
369 .procname
= "core_uses_pid",
370 .data
= &core_uses_pid
,
371 .maxlen
= sizeof(int),
373 .proc_handler
= &proc_dointvec
,
375 #ifdef CONFIG_AUDITSYSCALL
377 .ctl_name
= CTL_UNNUMBERED
,
378 .procname
= "audit_argv_kb",
379 .data
= &audit_argv_kb
,
380 .maxlen
= sizeof(int),
382 .proc_handler
= &proc_dointvec
,
386 .ctl_name
= KERN_CORE_PATTERN
,
387 .procname
= "core_pattern",
388 .data
= core_pattern
,
389 .maxlen
= CORENAME_MAX_SIZE
,
391 .proc_handler
= &proc_dostring
,
392 .strategy
= &sysctl_string
,
394 #ifdef CONFIG_PROC_SYSCTL
396 .procname
= "tainted",
398 .maxlen
= sizeof(int),
400 .proc_handler
= &proc_dointvec_taint
,
403 #ifdef CONFIG_SECURITY_CAPABILITIES
405 .procname
= "cap-bound",
407 .maxlen
= sizeof(kernel_cap_t
),
409 .proc_handler
= &proc_dointvec_bset
,
411 #endif /* def CONFIG_SECURITY_CAPABILITIES */
412 #ifdef CONFIG_BLK_DEV_INITRD
414 .ctl_name
= KERN_REALROOTDEV
,
415 .procname
= "real-root-dev",
416 .data
= &real_root_dev
,
417 .maxlen
= sizeof(int),
419 .proc_handler
= &proc_dointvec
,
423 .ctl_name
= CTL_UNNUMBERED
,
424 .procname
= "print-fatal-signals",
425 .data
= &print_fatal_signals
,
426 .maxlen
= sizeof(int),
428 .proc_handler
= &proc_dointvec
,
432 .ctl_name
= KERN_SPARC_REBOOT
,
433 .procname
= "reboot-cmd",
434 .data
= reboot_command
,
437 .proc_handler
= &proc_dostring
,
438 .strategy
= &sysctl_string
,
441 .ctl_name
= KERN_SPARC_STOP_A
,
442 .procname
= "stop-a",
443 .data
= &stop_a_enabled
,
444 .maxlen
= sizeof (int),
446 .proc_handler
= &proc_dointvec
,
449 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
450 .procname
= "scons-poweroff",
451 .data
= &scons_pwroff
,
452 .maxlen
= sizeof (int),
454 .proc_handler
= &proc_dointvec
,
459 .ctl_name
= KERN_HPPA_PWRSW
,
460 .procname
= "soft-power",
461 .data
= &pwrsw_enabled
,
462 .maxlen
= sizeof (int),
464 .proc_handler
= &proc_dointvec
,
467 .ctl_name
= KERN_HPPA_UNALIGNED
,
468 .procname
= "unaligned-trap",
469 .data
= &unaligned_enabled
,
470 .maxlen
= sizeof (int),
472 .proc_handler
= &proc_dointvec
,
476 .ctl_name
= KERN_CTLALTDEL
,
477 .procname
= "ctrl-alt-del",
479 .maxlen
= sizeof(int),
481 .proc_handler
= &proc_dointvec
,
484 .ctl_name
= KERN_PRINTK
,
485 .procname
= "printk",
486 .data
= &console_loglevel
,
487 .maxlen
= 4*sizeof(int),
489 .proc_handler
= &proc_dointvec
,
493 .ctl_name
= KERN_MODPROBE
,
494 .procname
= "modprobe",
495 .data
= &modprobe_path
,
496 .maxlen
= KMOD_PATH_LEN
,
498 .proc_handler
= &proc_dostring
,
499 .strategy
= &sysctl_string
,
502 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
504 .ctl_name
= KERN_HOTPLUG
,
505 .procname
= "hotplug",
506 .data
= &uevent_helper
,
507 .maxlen
= UEVENT_HELPER_PATH_LEN
,
509 .proc_handler
= &proc_dostring
,
510 .strategy
= &sysctl_string
,
513 #ifdef CONFIG_CHR_DEV_SG
515 .ctl_name
= KERN_SG_BIG_BUFF
,
516 .procname
= "sg-big-buff",
517 .data
= &sg_big_buff
,
518 .maxlen
= sizeof (int),
520 .proc_handler
= &proc_dointvec
,
523 #ifdef CONFIG_BSD_PROCESS_ACCT
525 .ctl_name
= KERN_ACCT
,
528 .maxlen
= 3*sizeof(int),
530 .proc_handler
= &proc_dointvec
,
533 #ifdef CONFIG_MAGIC_SYSRQ
535 .ctl_name
= KERN_SYSRQ
,
537 .data
= &__sysrq_enabled
,
538 .maxlen
= sizeof (int),
540 .proc_handler
= &proc_dointvec
,
543 #ifdef CONFIG_PROC_SYSCTL
545 .procname
= "cad_pid",
547 .maxlen
= sizeof (int),
549 .proc_handler
= &proc_do_cad_pid
,
553 .ctl_name
= KERN_MAX_THREADS
,
554 .procname
= "threads-max",
555 .data
= &max_threads
,
556 .maxlen
= sizeof(int),
558 .proc_handler
= &proc_dointvec
,
561 .ctl_name
= KERN_RANDOM
,
562 .procname
= "random",
564 .child
= random_table
,
567 .ctl_name
= KERN_OVERFLOWUID
,
568 .procname
= "overflowuid",
569 .data
= &overflowuid
,
570 .maxlen
= sizeof(int),
572 .proc_handler
= &proc_dointvec_minmax
,
573 .strategy
= &sysctl_intvec
,
574 .extra1
= &minolduid
,
575 .extra2
= &maxolduid
,
578 .ctl_name
= KERN_OVERFLOWGID
,
579 .procname
= "overflowgid",
580 .data
= &overflowgid
,
581 .maxlen
= sizeof(int),
583 .proc_handler
= &proc_dointvec_minmax
,
584 .strategy
= &sysctl_intvec
,
585 .extra1
= &minolduid
,
586 .extra2
= &maxolduid
,
589 #ifdef CONFIG_MATHEMU
591 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
592 .procname
= "ieee_emulation_warnings",
593 .data
= &sysctl_ieee_emulation_warnings
,
594 .maxlen
= sizeof(int),
596 .proc_handler
= &proc_dointvec
,
599 #ifdef CONFIG_NO_IDLE_HZ
601 .ctl_name
= KERN_HZ_TIMER
,
602 .procname
= "hz_timer",
603 .data
= &sysctl_hz_timer
,
604 .maxlen
= sizeof(int),
606 .proc_handler
= &proc_dointvec
,
610 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
611 .procname
= "userprocess_debug",
612 .data
= &sysctl_userprocess_debug
,
613 .maxlen
= sizeof(int),
615 .proc_handler
= &proc_dointvec
,
619 .ctl_name
= KERN_PIDMAX
,
620 .procname
= "pid_max",
622 .maxlen
= sizeof (int),
624 .proc_handler
= &proc_dointvec_minmax
,
625 .strategy
= sysctl_intvec
,
626 .extra1
= &pid_max_min
,
627 .extra2
= &pid_max_max
,
630 .ctl_name
= KERN_PANIC_ON_OOPS
,
631 .procname
= "panic_on_oops",
632 .data
= &panic_on_oops
,
633 .maxlen
= sizeof(int),
635 .proc_handler
= &proc_dointvec
,
638 .ctl_name
= KERN_PRINTK_RATELIMIT
,
639 .procname
= "printk_ratelimit",
640 .data
= &printk_ratelimit_jiffies
,
641 .maxlen
= sizeof(int),
643 .proc_handler
= &proc_dointvec_jiffies
,
644 .strategy
= &sysctl_jiffies
,
647 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
648 .procname
= "printk_ratelimit_burst",
649 .data
= &printk_ratelimit_burst
,
650 .maxlen
= sizeof(int),
652 .proc_handler
= &proc_dointvec
,
655 .ctl_name
= KERN_NGROUPS_MAX
,
656 .procname
= "ngroups_max",
657 .data
= &ngroups_max
,
658 .maxlen
= sizeof (int),
660 .proc_handler
= &proc_dointvec
,
662 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
664 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
665 .procname
= "unknown_nmi_panic",
666 .data
= &unknown_nmi_panic
,
667 .maxlen
= sizeof (int),
669 .proc_handler
= &proc_dointvec
,
672 .procname
= "nmi_watchdog",
673 .data
= &nmi_watchdog_enabled
,
674 .maxlen
= sizeof (int),
676 .proc_handler
= &proc_nmi_enabled
,
679 #if defined(CONFIG_X86)
681 .ctl_name
= KERN_PANIC_ON_NMI
,
682 .procname
= "panic_on_unrecovered_nmi",
683 .data
= &panic_on_unrecovered_nmi
,
684 .maxlen
= sizeof(int),
686 .proc_handler
= &proc_dointvec
,
689 .ctl_name
= KERN_BOOTLOADER_TYPE
,
690 .procname
= "bootloader_type",
691 .data
= &bootloader_type
,
692 .maxlen
= sizeof (int),
694 .proc_handler
= &proc_dointvec
,
697 .ctl_name
= CTL_UNNUMBERED
,
698 .procname
= "kstack_depth_to_print",
699 .data
= &kstack_depth_to_print
,
700 .maxlen
= sizeof(int),
702 .proc_handler
= &proc_dointvec
,
705 #if defined(CONFIG_MMU)
707 .ctl_name
= KERN_RANDOMIZE
,
708 .procname
= "randomize_va_space",
709 .data
= &randomize_va_space
,
710 .maxlen
= sizeof(int),
712 .proc_handler
= &proc_dointvec
,
715 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
717 .ctl_name
= KERN_SPIN_RETRY
,
718 .procname
= "spin_retry",
720 .maxlen
= sizeof (int),
722 .proc_handler
= &proc_dointvec
,
725 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
727 .procname
= "acpi_video_flags",
728 .data
= &acpi_realmode_flags
,
729 .maxlen
= sizeof (unsigned long),
731 .proc_handler
= &proc_doulongvec_minmax
,
736 .ctl_name
= KERN_IA64_UNALIGNED
,
737 .procname
= "ignore-unaligned-usertrap",
738 .data
= &no_unaligned_warning
,
739 .maxlen
= sizeof (int),
741 .proc_handler
= &proc_dointvec
,
744 #ifdef CONFIG_DETECT_SOFTLOCKUP
746 .ctl_name
= CTL_UNNUMBERED
,
747 .procname
= "softlockup_thresh",
748 .data
= &softlockup_thresh
,
749 .maxlen
= sizeof(int),
751 .proc_handler
= &proc_dointvec_minmax
,
752 .strategy
= &sysctl_intvec
,
757 .ctl_name
= CTL_UNNUMBERED
,
758 .procname
= "hung_task_check_count",
759 .data
= &sysctl_hung_task_check_count
,
760 .maxlen
= sizeof(int),
762 .proc_handler
= &proc_dointvec_minmax
,
763 .strategy
= &sysctl_intvec
,
766 .ctl_name
= CTL_UNNUMBERED
,
767 .procname
= "hung_task_timeout_secs",
768 .data
= &sysctl_hung_task_timeout_secs
,
769 .maxlen
= sizeof(int),
771 .proc_handler
= &proc_dointvec_minmax
,
772 .strategy
= &sysctl_intvec
,
775 .ctl_name
= CTL_UNNUMBERED
,
776 .procname
= "hung_task_warnings",
777 .data
= &sysctl_hung_task_warnings
,
778 .maxlen
= sizeof(int),
780 .proc_handler
= &proc_dointvec_minmax
,
781 .strategy
= &sysctl_intvec
,
786 .ctl_name
= KERN_COMPAT_LOG
,
787 .procname
= "compat-log",
789 .maxlen
= sizeof (int),
791 .proc_handler
= &proc_dointvec
,
794 #ifdef CONFIG_RT_MUTEXES
796 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
797 .procname
= "max_lock_depth",
798 .data
= &max_lock_depth
,
799 .maxlen
= sizeof(int),
801 .proc_handler
= &proc_dointvec
,
804 #ifdef CONFIG_PROC_FS
806 .ctl_name
= CTL_UNNUMBERED
,
807 .procname
= "maps_protect",
808 .data
= &maps_protect
,
809 .maxlen
= sizeof(int),
811 .proc_handler
= &proc_dointvec
,
815 .ctl_name
= CTL_UNNUMBERED
,
816 .procname
= "poweroff_cmd",
817 .data
= &poweroff_cmd
,
818 .maxlen
= POWEROFF_CMD_PATH_LEN
,
820 .proc_handler
= &proc_dostring
,
821 .strategy
= &sysctl_string
,
824 * NOTE: do not add new entries to this table unless you have read
825 * Documentation/sysctl/ctl_unnumbered.txt
830 static struct ctl_table vm_table
[] = {
832 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
833 .procname
= "overcommit_memory",
834 .data
= &sysctl_overcommit_memory
,
835 .maxlen
= sizeof(sysctl_overcommit_memory
),
837 .proc_handler
= &proc_dointvec
,
840 .ctl_name
= VM_PANIC_ON_OOM
,
841 .procname
= "panic_on_oom",
842 .data
= &sysctl_panic_on_oom
,
843 .maxlen
= sizeof(sysctl_panic_on_oom
),
845 .proc_handler
= &proc_dointvec
,
848 .ctl_name
= CTL_UNNUMBERED
,
849 .procname
= "oom_kill_allocating_task",
850 .data
= &sysctl_oom_kill_allocating_task
,
851 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
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
= &nr_overcommit_huge_pages
,
956 .maxlen
= sizeof(nr_overcommit_huge_pages
),
958 .proc_handler
= &proc_doulongvec_minmax
,
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
,
1130 * NOTE: do not add new entries to this table unless you have read
1131 * Documentation/sysctl/ctl_unnumbered.txt
1136 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1137 static struct ctl_table binfmt_misc_table
[] = {
1142 static struct ctl_table fs_table
[] = {
1144 .ctl_name
= FS_NRINODE
,
1145 .procname
= "inode-nr",
1146 .data
= &inodes_stat
,
1147 .maxlen
= 2*sizeof(int),
1149 .proc_handler
= &proc_dointvec
,
1152 .ctl_name
= FS_STATINODE
,
1153 .procname
= "inode-state",
1154 .data
= &inodes_stat
,
1155 .maxlen
= 7*sizeof(int),
1157 .proc_handler
= &proc_dointvec
,
1160 .procname
= "file-nr",
1161 .data
= &files_stat
,
1162 .maxlen
= 3*sizeof(int),
1164 .proc_handler
= &proc_nr_files
,
1167 .ctl_name
= FS_MAXFILE
,
1168 .procname
= "file-max",
1169 .data
= &files_stat
.max_files
,
1170 .maxlen
= sizeof(int),
1172 .proc_handler
= &proc_dointvec
,
1175 .ctl_name
= FS_DENTRY
,
1176 .procname
= "dentry-state",
1177 .data
= &dentry_stat
,
1178 .maxlen
= 6*sizeof(int),
1180 .proc_handler
= &proc_dointvec
,
1183 .ctl_name
= FS_OVERFLOWUID
,
1184 .procname
= "overflowuid",
1185 .data
= &fs_overflowuid
,
1186 .maxlen
= sizeof(int),
1188 .proc_handler
= &proc_dointvec_minmax
,
1189 .strategy
= &sysctl_intvec
,
1190 .extra1
= &minolduid
,
1191 .extra2
= &maxolduid
,
1194 .ctl_name
= FS_OVERFLOWGID
,
1195 .procname
= "overflowgid",
1196 .data
= &fs_overflowgid
,
1197 .maxlen
= sizeof(int),
1199 .proc_handler
= &proc_dointvec_minmax
,
1200 .strategy
= &sysctl_intvec
,
1201 .extra1
= &minolduid
,
1202 .extra2
= &maxolduid
,
1205 .ctl_name
= FS_LEASES
,
1206 .procname
= "leases-enable",
1207 .data
= &leases_enable
,
1208 .maxlen
= sizeof(int),
1210 .proc_handler
= &proc_dointvec
,
1212 #ifdef CONFIG_DNOTIFY
1214 .ctl_name
= FS_DIR_NOTIFY
,
1215 .procname
= "dir-notify-enable",
1216 .data
= &dir_notify_enable
,
1217 .maxlen
= sizeof(int),
1219 .proc_handler
= &proc_dointvec
,
1224 .ctl_name
= FS_LEASE_TIME
,
1225 .procname
= "lease-break-time",
1226 .data
= &lease_break_time
,
1227 .maxlen
= sizeof(int),
1229 .proc_handler
= &proc_dointvec_minmax
,
1230 .strategy
= &sysctl_intvec
,
1235 .procname
= "aio-nr",
1237 .maxlen
= sizeof(aio_nr
),
1239 .proc_handler
= &proc_doulongvec_minmax
,
1242 .procname
= "aio-max-nr",
1243 .data
= &aio_max_nr
,
1244 .maxlen
= sizeof(aio_max_nr
),
1246 .proc_handler
= &proc_doulongvec_minmax
,
1248 #ifdef CONFIG_INOTIFY_USER
1250 .ctl_name
= FS_INOTIFY
,
1251 .procname
= "inotify",
1253 .child
= inotify_table
,
1258 .ctl_name
= KERN_SETUID_DUMPABLE
,
1259 .procname
= "suid_dumpable",
1260 .data
= &suid_dumpable
,
1261 .maxlen
= sizeof(int),
1263 .proc_handler
= &proc_dointvec
,
1265 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1267 .ctl_name
= CTL_UNNUMBERED
,
1268 .procname
= "binfmt_misc",
1270 .child
= binfmt_misc_table
,
1274 * NOTE: do not add new entries to this table unless you have read
1275 * Documentation/sysctl/ctl_unnumbered.txt
1280 static struct ctl_table debug_table
[] = {
1281 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1283 .ctl_name
= CTL_UNNUMBERED
,
1284 .procname
= "exception-trace",
1285 .data
= &show_unhandled_signals
,
1286 .maxlen
= sizeof(int),
1288 .proc_handler
= proc_dointvec
1294 static struct ctl_table dev_table
[] = {
1298 static DEFINE_SPINLOCK(sysctl_lock
);
1300 /* called under sysctl_lock */
1301 static int use_table(struct ctl_table_header
*p
)
1303 if (unlikely(p
->unregistering
))
1309 /* called under sysctl_lock */
1310 static void unuse_table(struct ctl_table_header
*p
)
1313 if (unlikely(p
->unregistering
))
1314 complete(p
->unregistering
);
1317 /* called under sysctl_lock, will reacquire if has to wait */
1318 static void start_unregistering(struct ctl_table_header
*p
)
1321 * if p->used is 0, nobody will ever touch that entry again;
1322 * we'll eliminate all paths to it before dropping sysctl_lock
1324 if (unlikely(p
->used
)) {
1325 struct completion wait
;
1326 init_completion(&wait
);
1327 p
->unregistering
= &wait
;
1328 spin_unlock(&sysctl_lock
);
1329 wait_for_completion(&wait
);
1330 spin_lock(&sysctl_lock
);
1333 * do not remove from the list until nobody holds it; walking the
1334 * list in do_sysctl() relies on that.
1336 list_del_init(&p
->ctl_entry
);
1339 void sysctl_head_finish(struct ctl_table_header
*head
)
1343 spin_lock(&sysctl_lock
);
1345 spin_unlock(&sysctl_lock
);
1348 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1350 struct ctl_table_header
*head
;
1351 struct list_head
*tmp
;
1352 spin_lock(&sysctl_lock
);
1354 tmp
= &prev
->ctl_entry
;
1358 tmp
= &root_table_header
.ctl_entry
;
1360 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1362 if (!use_table(head
))
1364 spin_unlock(&sysctl_lock
);
1368 if (tmp
== &root_table_header
.ctl_entry
)
1371 spin_unlock(&sysctl_lock
);
1375 #ifdef CONFIG_SYSCTL_SYSCALL
1376 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1377 void __user
*newval
, size_t newlen
)
1379 struct ctl_table_header
*head
;
1380 int error
= -ENOTDIR
;
1382 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1386 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1390 for (head
= sysctl_head_next(NULL
); head
;
1391 head
= sysctl_head_next(head
)) {
1392 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1393 newval
, newlen
, head
->ctl_table
);
1394 if (error
!= -ENOTDIR
) {
1395 sysctl_head_finish(head
);
1402 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1404 struct __sysctl_args tmp
;
1407 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1410 error
= deprecated_sysctl_warning(&tmp
);
1415 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1416 tmp
.newval
, tmp
.newlen
);
1421 #endif /* CONFIG_SYSCTL_SYSCALL */
1424 * sysctl_perm does NOT grant the superuser all rights automatically, because
1425 * some sysctl variables are readonly even to root.
1428 static int test_perm(int mode
, int op
)
1432 else if (in_egroup_p(0))
1434 if ((mode
& op
& 0007) == op
)
1439 int sysctl_perm(struct ctl_table
*table
, int op
)
1442 error
= security_sysctl(table
, op
);
1445 return test_perm(table
->mode
, op
);
1448 #ifdef CONFIG_SYSCTL_SYSCALL
1449 static int parse_table(int __user
*name
, int nlen
,
1450 void __user
*oldval
, size_t __user
*oldlenp
,
1451 void __user
*newval
, size_t newlen
,
1452 struct ctl_table
*table
)
1458 if (get_user(n
, name
))
1460 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1461 if (!table
->ctl_name
)
1463 if (n
== table
->ctl_name
) {
1466 if (sysctl_perm(table
, 001))
1470 table
= table
->child
;
1473 error
= do_sysctl_strategy(table
, name
, nlen
,
1482 /* Perform the actual read/write of a sysctl table entry. */
1483 int do_sysctl_strategy (struct ctl_table
*table
,
1484 int __user
*name
, int nlen
,
1485 void __user
*oldval
, size_t __user
*oldlenp
,
1486 void __user
*newval
, size_t newlen
)
1494 if (sysctl_perm(table
, op
))
1497 if (table
->strategy
) {
1498 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1506 /* If there is no strategy routine, or if the strategy returns
1507 * zero, proceed with automatic r/w */
1508 if (table
->data
&& table
->maxlen
) {
1509 rc
= sysctl_data(table
, name
, nlen
, oldval
, oldlenp
,
1516 #endif /* CONFIG_SYSCTL_SYSCALL */
1518 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1520 for (; table
->ctl_name
|| table
->procname
; table
++) {
1521 table
->parent
= parent
;
1523 sysctl_set_parent(table
, table
->child
);
1527 static __init
int sysctl_init(void)
1530 sysctl_set_parent(NULL
, root_table
);
1531 err
= sysctl_check_table(root_table
);
1535 core_initcall(sysctl_init
);
1538 * register_sysctl_table - register a sysctl hierarchy
1539 * @table: the top-level table structure
1541 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1542 * array. An entry with a ctl_name of 0 terminates the table.
1544 * The members of the &struct ctl_table structure are used as follows:
1546 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1547 * must be unique within that level of sysctl
1549 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1550 * enter a sysctl file
1552 * data - a pointer to data for use by proc_handler
1554 * maxlen - the maximum size in bytes of the data
1556 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1558 * child - a pointer to the child sysctl table if this entry is a directory, or
1561 * proc_handler - the text handler routine (described below)
1563 * strategy - the strategy routine (described below)
1565 * de - for internal use by the sysctl routines
1567 * extra1, extra2 - extra pointers usable by the proc handler routines
1569 * Leaf nodes in the sysctl tree will be represented by a single file
1570 * under /proc; non-leaf nodes will be represented by directories.
1572 * sysctl(2) can automatically manage read and write requests through
1573 * the sysctl table. The data and maxlen fields of the ctl_table
1574 * struct enable minimal validation of the values being written to be
1575 * performed, and the mode field allows minimal authentication.
1577 * More sophisticated management can be enabled by the provision of a
1578 * strategy routine with the table entry. This will be called before
1579 * any automatic read or write of the data is performed.
1581 * The strategy routine may return
1583 * < 0 - Error occurred (error is passed to user process)
1585 * 0 - OK - proceed with automatic read or write.
1587 * > 0 - OK - read or write has been done by the strategy routine, so
1588 * return immediately.
1590 * There must be a proc_handler routine for any terminal nodes
1591 * mirrored under /proc/sys (non-terminals are handled by a built-in
1592 * directory handler). Several default handlers are available to
1593 * cover common cases -
1595 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1596 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1597 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1599 * It is the handler's job to read the input buffer from user memory
1600 * and process it. The handler should return 0 on success.
1602 * This routine returns %NULL on a failure to register, and a pointer
1603 * to the table header on success.
1605 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
1607 struct ctl_table_header
*tmp
;
1608 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1611 tmp
->ctl_table
= table
;
1612 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1614 tmp
->unregistering
= NULL
;
1615 sysctl_set_parent(NULL
, table
);
1616 if (sysctl_check_table(tmp
->ctl_table
)) {
1620 spin_lock(&sysctl_lock
);
1621 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1622 spin_unlock(&sysctl_lock
);
1627 * unregister_sysctl_table - unregister a sysctl table hierarchy
1628 * @header: the header returned from register_sysctl_table
1630 * Unregisters the sysctl table and all children. proc entries may not
1631 * actually be removed until they are no longer used by anyone.
1633 void unregister_sysctl_table(struct ctl_table_header
* header
)
1640 spin_lock(&sysctl_lock
);
1641 start_unregistering(header
);
1642 spin_unlock(&sysctl_lock
);
1646 #else /* !CONFIG_SYSCTL */
1647 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
1652 void unregister_sysctl_table(struct ctl_table_header
* table
)
1656 #endif /* CONFIG_SYSCTL */
1662 #ifdef CONFIG_PROC_SYSCTL
1664 static int _proc_do_string(void* data
, int maxlen
, int write
,
1665 struct file
*filp
, void __user
*buffer
,
1666 size_t *lenp
, loff_t
*ppos
)
1672 if (!data
|| !maxlen
|| !*lenp
) {
1680 while (len
< *lenp
) {
1681 if (get_user(c
, p
++))
1683 if (c
== 0 || c
== '\n')
1689 if(copy_from_user(data
, buffer
, len
))
1691 ((char *) data
)[len
] = 0;
1709 if(copy_to_user(buffer
, data
, len
))
1712 if(put_user('\n', ((char __user
*) buffer
) + len
))
1723 * proc_dostring - read a string sysctl
1724 * @table: the sysctl table
1725 * @write: %TRUE if this is a write to the sysctl file
1726 * @filp: the file structure
1727 * @buffer: the user buffer
1728 * @lenp: the size of the user buffer
1729 * @ppos: file position
1731 * Reads/writes a string from/to the user buffer. If the kernel
1732 * buffer provided is not large enough to hold the string, the
1733 * string is truncated. The copied string is %NULL-terminated.
1734 * If the string is being read by the user process, it is copied
1735 * and a newline '\n' is added. It is truncated if the buffer is
1738 * Returns 0 on success.
1740 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
1741 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1743 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1744 buffer
, lenp
, ppos
);
1748 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1750 int write
, void *data
)
1753 *valp
= *negp
? -*lvalp
: *lvalp
;
1758 *lvalp
= (unsigned long)-val
;
1761 *lvalp
= (unsigned long)val
;
1767 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1768 int write
, struct file
*filp
, void __user
*buffer
,
1769 size_t *lenp
, loff_t
*ppos
,
1770 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1771 int write
, void *data
),
1774 #define TMPBUFLEN 21
1775 int *i
, vleft
, first
=1, neg
, val
;
1779 char buf
[TMPBUFLEN
], *p
;
1780 char __user
*s
= buffer
;
1782 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1783 (*ppos
&& !write
)) {
1788 i
= (int *) tbl_data
;
1789 vleft
= table
->maxlen
/ sizeof(*i
);
1793 conv
= do_proc_dointvec_conv
;
1795 for (; left
&& vleft
--; i
++, first
=0) {
1810 if (len
> sizeof(buf
) - 1)
1811 len
= sizeof(buf
) - 1;
1812 if (copy_from_user(buf
, s
, len
))
1816 if (*p
== '-' && left
> 1) {
1820 if (*p
< '0' || *p
> '9')
1823 lval
= simple_strtoul(p
, &p
, 0);
1826 if ((len
< left
) && *p
&& !isspace(*p
))
1833 if (conv(&neg
, &lval
, i
, 1, data
))
1840 if (conv(&neg
, &lval
, i
, 0, data
))
1843 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1847 if(copy_to_user(s
, buf
, len
))
1854 if (!write
&& !first
&& left
) {
1855 if(put_user('\n', s
))
1862 if (get_user(c
, s
++))
1877 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
1878 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1879 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1880 int write
, void *data
),
1883 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
1884 buffer
, lenp
, ppos
, conv
, data
);
1888 * proc_dointvec - read a vector of integers
1889 * @table: the sysctl table
1890 * @write: %TRUE if this is a write to the sysctl file
1891 * @filp: the file structure
1892 * @buffer: the user buffer
1893 * @lenp: the size of the user buffer
1894 * @ppos: file position
1896 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1897 * values from/to the user buffer, treated as an ASCII string.
1899 * Returns 0 on success.
1901 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
1902 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1904 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1912 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1914 int write
, void *data
)
1916 int op
= *(int *)data
;
1918 int val
= *negp
? -*lvalp
: *lvalp
;
1920 case OP_SET
: *valp
= val
; break;
1921 case OP_AND
: *valp
&= val
; break;
1922 case OP_OR
: *valp
|= val
; break;
1928 *lvalp
= (unsigned long)-val
;
1931 *lvalp
= (unsigned long)val
;
1937 #ifdef CONFIG_SECURITY_CAPABILITIES
1939 * init may raise the set.
1942 int proc_dointvec_bset(struct ctl_table
*table
, int write
, struct file
*filp
,
1943 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1947 if (write
&& !capable(CAP_SYS_MODULE
)) {
1951 op
= is_global_init(current
) ? OP_SET
: OP_AND
;
1952 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1953 do_proc_dointvec_bset_conv
,&op
);
1955 #endif /* def CONFIG_SECURITY_CAPABILITIES */
1958 * Taint values can only be increased
1960 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
1961 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1965 if (write
&& !capable(CAP_SYS_ADMIN
))
1969 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1970 do_proc_dointvec_bset_conv
,&op
);
1973 struct do_proc_dointvec_minmax_conv_param
{
1978 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1980 int write
, void *data
)
1982 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1984 int val
= *negp
? -*lvalp
: *lvalp
;
1985 if ((param
->min
&& *param
->min
> val
) ||
1986 (param
->max
&& *param
->max
< val
))
1993 *lvalp
= (unsigned long)-val
;
1996 *lvalp
= (unsigned long)val
;
2003 * proc_dointvec_minmax - read a vector of integers with min/max values
2004 * @table: the sysctl table
2005 * @write: %TRUE if this is a write to the sysctl file
2006 * @filp: the file structure
2007 * @buffer: the user buffer
2008 * @lenp: the size of the user buffer
2009 * @ppos: file position
2011 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2012 * values from/to the user buffer, treated as an ASCII string.
2014 * This routine will ensure the values are within the range specified by
2015 * table->extra1 (min) and table->extra2 (max).
2017 * Returns 0 on success.
2019 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2020 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2022 struct do_proc_dointvec_minmax_conv_param param
= {
2023 .min
= (int *) table
->extra1
,
2024 .max
= (int *) table
->extra2
,
2026 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2027 do_proc_dointvec_minmax_conv
, ¶m
);
2030 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2032 void __user
*buffer
,
2033 size_t *lenp
, loff_t
*ppos
,
2034 unsigned long convmul
,
2035 unsigned long convdiv
)
2037 #define TMPBUFLEN 21
2038 unsigned long *i
, *min
, *max
, val
;
2039 int vleft
, first
=1, neg
;
2041 char buf
[TMPBUFLEN
], *p
;
2042 char __user
*s
= buffer
;
2044 if (!data
|| !table
->maxlen
|| !*lenp
||
2045 (*ppos
&& !write
)) {
2050 i
= (unsigned long *) data
;
2051 min
= (unsigned long *) table
->extra1
;
2052 max
= (unsigned long *) table
->extra2
;
2053 vleft
= table
->maxlen
/ sizeof(unsigned long);
2056 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2071 if (len
> TMPBUFLEN
-1)
2073 if (copy_from_user(buf
, s
, len
))
2077 if (*p
== '-' && left
> 1) {
2081 if (*p
< '0' || *p
> '9')
2083 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2085 if ((len
< left
) && *p
&& !isspace(*p
))
2094 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2101 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2105 if(copy_to_user(s
, buf
, len
))
2112 if (!write
&& !first
&& left
) {
2113 if(put_user('\n', s
))
2120 if (get_user(c
, s
++))
2135 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2137 void __user
*buffer
,
2138 size_t *lenp
, loff_t
*ppos
,
2139 unsigned long convmul
,
2140 unsigned long convdiv
)
2142 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2143 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2147 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2148 * @table: the sysctl table
2149 * @write: %TRUE if this is a write to the sysctl file
2150 * @filp: the file structure
2151 * @buffer: the user buffer
2152 * @lenp: the size of the user buffer
2153 * @ppos: file position
2155 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2156 * values from/to the user buffer, treated as an ASCII string.
2158 * This routine will ensure the values are within the range specified by
2159 * table->extra1 (min) and table->extra2 (max).
2161 * Returns 0 on success.
2163 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2164 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2166 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2170 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2171 * @table: the sysctl table
2172 * @write: %TRUE if this is a write to the sysctl file
2173 * @filp: the file structure
2174 * @buffer: the user buffer
2175 * @lenp: the size of the user buffer
2176 * @ppos: file position
2178 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2179 * values from/to the user buffer, treated as an ASCII string. The values
2180 * are treated as milliseconds, and converted to jiffies when they are stored.
2182 * This routine will ensure the values are within the range specified by
2183 * table->extra1 (min) and table->extra2 (max).
2185 * Returns 0 on success.
2187 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2189 void __user
*buffer
,
2190 size_t *lenp
, loff_t
*ppos
)
2192 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2193 lenp
, ppos
, HZ
, 1000l);
2197 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2199 int write
, void *data
)
2202 if (*lvalp
> LONG_MAX
/ HZ
)
2204 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2210 lval
= (unsigned long)-val
;
2213 lval
= (unsigned long)val
;
2220 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2222 int write
, void *data
)
2225 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2227 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2233 lval
= (unsigned long)-val
;
2236 lval
= (unsigned long)val
;
2238 *lvalp
= jiffies_to_clock_t(lval
);
2243 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2245 int write
, void *data
)
2248 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2254 lval
= (unsigned long)-val
;
2257 lval
= (unsigned long)val
;
2259 *lvalp
= jiffies_to_msecs(lval
);
2265 * proc_dointvec_jiffies - read a vector of integers as seconds
2266 * @table: the sysctl table
2267 * @write: %TRUE if this is a write to the sysctl file
2268 * @filp: the file structure
2269 * @buffer: the user buffer
2270 * @lenp: the size of the user buffer
2271 * @ppos: file position
2273 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2274 * values from/to the user buffer, treated as an ASCII string.
2275 * The values read are assumed to be in seconds, and are converted into
2278 * Returns 0 on success.
2280 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2281 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2283 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2284 do_proc_dointvec_jiffies_conv
,NULL
);
2288 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2289 * @table: the sysctl table
2290 * @write: %TRUE if this is a write to the sysctl file
2291 * @filp: the file structure
2292 * @buffer: the user buffer
2293 * @lenp: the size of the user buffer
2294 * @ppos: pointer to the file position
2296 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2297 * values from/to the user buffer, treated as an ASCII string.
2298 * The values read are assumed to be in 1/USER_HZ seconds, and
2299 * are converted into jiffies.
2301 * Returns 0 on success.
2303 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2304 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2306 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2307 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2311 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2312 * @table: the sysctl table
2313 * @write: %TRUE if this is a write to the sysctl file
2314 * @filp: the file structure
2315 * @buffer: the user buffer
2316 * @lenp: the size of the user buffer
2317 * @ppos: file position
2318 * @ppos: the current position in the file
2320 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2321 * values from/to the user buffer, treated as an ASCII string.
2322 * The values read are assumed to be in 1/1000 seconds, and
2323 * are converted into jiffies.
2325 * Returns 0 on success.
2327 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2328 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2330 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2331 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2334 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2335 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2337 struct pid
*new_pid
;
2341 tmp
= pid_nr_ns(cad_pid
, current
->nsproxy
->pid_ns
);
2343 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2344 lenp
, ppos
, NULL
, NULL
);
2348 new_pid
= find_get_pid(tmp
);
2352 put_pid(xchg(&cad_pid
, new_pid
));
2356 #else /* CONFIG_PROC_FS */
2358 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2359 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2364 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2365 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2370 int proc_dointvec_bset(struct ctl_table
*table
, int write
, struct file
*filp
,
2371 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2376 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2377 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2382 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2383 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2388 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2389 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2394 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2395 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2400 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2401 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2406 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2408 void __user
*buffer
,
2409 size_t *lenp
, loff_t
*ppos
)
2415 #endif /* CONFIG_PROC_FS */
2418 #ifdef CONFIG_SYSCTL_SYSCALL
2420 * General sysctl support routines
2423 /* The generic sysctl data routine (used if no strategy routine supplied) */
2424 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2425 void __user
*oldval
, size_t __user
*oldlenp
,
2426 void __user
*newval
, size_t newlen
)
2430 /* Get out of I don't have a variable */
2431 if (!table
->data
|| !table
->maxlen
)
2434 if (oldval
&& oldlenp
) {
2435 if (get_user(len
, oldlenp
))
2438 if (len
> table
->maxlen
)
2439 len
= table
->maxlen
;
2440 if (copy_to_user(oldval
, table
->data
, len
))
2442 if (put_user(len
, oldlenp
))
2447 if (newval
&& newlen
) {
2448 if (newlen
> table
->maxlen
)
2449 newlen
= table
->maxlen
;
2451 if (copy_from_user(table
->data
, newval
, newlen
))
2457 /* The generic string strategy routine: */
2458 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2459 void __user
*oldval
, size_t __user
*oldlenp
,
2460 void __user
*newval
, size_t newlen
)
2462 if (!table
->data
|| !table
->maxlen
)
2465 if (oldval
&& oldlenp
) {
2467 if (get_user(bufsize
, oldlenp
))
2470 size_t len
= strlen(table
->data
), copied
;
2472 /* This shouldn't trigger for a well-formed sysctl */
2473 if (len
> table
->maxlen
)
2474 len
= table
->maxlen
;
2476 /* Copy up to a max of bufsize-1 bytes of the string */
2477 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2479 if (copy_to_user(oldval
, table
->data
, copied
) ||
2480 put_user(0, (char __user
*)(oldval
+ copied
)))
2482 if (put_user(len
, oldlenp
))
2486 if (newval
&& newlen
) {
2487 size_t len
= newlen
;
2488 if (len
> table
->maxlen
)
2489 len
= table
->maxlen
;
2490 if(copy_from_user(table
->data
, newval
, len
))
2492 if (len
== table
->maxlen
)
2494 ((char *) table
->data
)[len
] = 0;
2500 * This function makes sure that all of the integers in the vector
2501 * are between the minimum and maximum values given in the arrays
2502 * table->extra1 and table->extra2, respectively.
2504 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2505 void __user
*oldval
, size_t __user
*oldlenp
,
2506 void __user
*newval
, size_t newlen
)
2509 if (newval
&& newlen
) {
2510 int __user
*vec
= (int __user
*) newval
;
2511 int *min
= (int *) table
->extra1
;
2512 int *max
= (int *) table
->extra2
;
2516 if (newlen
% sizeof(int) != 0)
2519 if (!table
->extra1
&& !table
->extra2
)
2522 if (newlen
> table
->maxlen
)
2523 newlen
= table
->maxlen
;
2524 length
= newlen
/ sizeof(int);
2526 for (i
= 0; i
< length
; i
++) {
2528 if (get_user(value
, vec
+ i
))
2530 if (min
&& value
< min
[i
])
2532 if (max
&& value
> max
[i
])
2539 /* Strategy function to convert jiffies to seconds */
2540 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2541 void __user
*oldval
, size_t __user
*oldlenp
,
2542 void __user
*newval
, size_t newlen
)
2544 if (oldval
&& oldlenp
) {
2547 if (get_user(olen
, oldlenp
))
2552 if (olen
< sizeof(int))
2555 val
= *(int *)(table
->data
) / HZ
;
2556 if (put_user(val
, (int __user
*)oldval
))
2558 if (put_user(sizeof(int), oldlenp
))
2562 if (newval
&& newlen
) {
2564 if (newlen
!= sizeof(int))
2566 if (get_user(new, (int __user
*)newval
))
2568 *(int *)(table
->data
) = new*HZ
;
2573 /* Strategy function to convert jiffies to seconds */
2574 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2575 void __user
*oldval
, size_t __user
*oldlenp
,
2576 void __user
*newval
, size_t newlen
)
2578 if (oldval
&& oldlenp
) {
2581 if (get_user(olen
, oldlenp
))
2586 if (olen
< sizeof(int))
2589 val
= jiffies_to_msecs(*(int *)(table
->data
));
2590 if (put_user(val
, (int __user
*)oldval
))
2592 if (put_user(sizeof(int), oldlenp
))
2596 if (newval
&& newlen
) {
2598 if (newlen
!= sizeof(int))
2600 if (get_user(new, (int __user
*)newval
))
2602 *(int *)(table
->data
) = msecs_to_jiffies(new);
2609 #else /* CONFIG_SYSCTL_SYSCALL */
2612 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2614 struct __sysctl_args tmp
;
2617 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2620 error
= deprecated_sysctl_warning(&tmp
);
2622 /* If no error reading the parameters then just -ENOSYS ... */
2629 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2630 void __user
*oldval
, size_t __user
*oldlenp
,
2631 void __user
*newval
, size_t newlen
)
2636 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2637 void __user
*oldval
, size_t __user
*oldlenp
,
2638 void __user
*newval
, size_t newlen
)
2643 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2644 void __user
*oldval
, size_t __user
*oldlenp
,
2645 void __user
*newval
, size_t newlen
)
2650 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2651 void __user
*oldval
, size_t __user
*oldlenp
,
2652 void __user
*newval
, size_t newlen
)
2657 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2658 void __user
*oldval
, size_t __user
*oldlenp
,
2659 void __user
*newval
, size_t newlen
)
2664 #endif /* CONFIG_SYSCTL_SYSCALL */
2666 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
2668 static int msg_count
;
2669 int name
[CTL_MAXNAME
];
2672 /* Check args->nlen. */
2673 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
2676 /* Read in the sysctl name for better debug message logging */
2677 for (i
= 0; i
< args
->nlen
; i
++)
2678 if (get_user(name
[i
], args
->name
+ i
))
2681 /* Ignore accesses to kernel.version */
2682 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2685 if (msg_count
< 5) {
2688 "warning: process `%s' used the deprecated sysctl "
2689 "system call with ", current
->comm
);
2690 for (i
= 0; i
< args
->nlen
; i
++)
2691 printk("%d.", name
[i
]);
2698 * No sense putting this after each symbol definition, twice,
2699 * exception granted :-)
2701 EXPORT_SYMBOL(proc_dointvec
);
2702 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2703 EXPORT_SYMBOL(proc_dointvec_minmax
);
2704 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2705 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2706 EXPORT_SYMBOL(proc_dostring
);
2707 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2708 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2709 EXPORT_SYMBOL(register_sysctl_table
);
2710 EXPORT_SYMBOL(sysctl_intvec
);
2711 EXPORT_SYMBOL(sysctl_jiffies
);
2712 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2713 EXPORT_SYMBOL(sysctl_string
);
2714 EXPORT_SYMBOL(sysctl_data
);
2715 EXPORT_SYMBOL(unregister_sysctl_table
);