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>
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 max_threads
;
71 extern int core_uses_pid
;
72 extern int suid_dumpable
;
73 extern char core_pattern
[];
75 extern int min_free_kbytes
;
76 extern int printk_ratelimit_jiffies
;
77 extern int printk_ratelimit_burst
;
78 extern int pid_max_min
, pid_max_max
;
79 extern int sysctl_drop_caches
;
80 extern int percpu_pagelist_fraction
;
81 extern int compat_log
;
82 extern int maps_protect
;
83 extern int sysctl_stat_interval
;
84 extern int audit_argv_kb
;
85 extern int latencytop_enabled
;
87 /* Constants used for minimum and maximum */
88 #ifdef CONFIG_DETECT_SOFTLOCKUP
90 static int sixty
= 60;
98 static int one_hundred
= 100;
100 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
101 static int maxolduid
= 65535;
102 static int minolduid
;
103 static int min_percpu_pagelist_fract
= 8;
105 static int ngroups_max
= NGROUPS_MAX
;
108 extern char modprobe_path
[];
110 #ifdef CONFIG_CHR_DEV_SG
111 extern int sg_big_buff
;
115 extern char reboot_command
[];
116 extern int stop_a_enabled
;
117 extern int scons_pwroff
;
121 extern int pwrsw_enabled
;
122 extern int unaligned_enabled
;
126 #ifdef CONFIG_MATHEMU
127 extern int sysctl_ieee_emulation_warnings
;
129 extern int sysctl_userprocess_debug
;
130 extern int spin_retry
;
133 extern int sysctl_hz_timer
;
135 #ifdef CONFIG_BSD_PROCESS_ACCT
136 extern int acct_parm
[];
140 extern int no_unaligned_warning
;
143 #ifdef CONFIG_RT_MUTEXES
144 extern int max_lock_depth
;
147 #ifdef CONFIG_SYSCTL_SYSCALL
148 static int parse_table(int __user
*, int, void __user
*, size_t __user
*,
149 void __user
*, size_t, struct ctl_table
*);
153 #ifdef CONFIG_PROC_SYSCTL
154 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
155 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
156 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
157 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
160 static struct ctl_table root_table
[];
161 static struct ctl_table_root sysctl_table_root
;
162 static struct ctl_table_header root_table_header
= {
163 .ctl_table
= root_table
,
164 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.header_list
),
165 .root
= &sysctl_table_root
,
167 static struct ctl_table_root sysctl_table_root
= {
168 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
169 .header_list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
172 static struct ctl_table kern_table
[];
173 static struct ctl_table vm_table
[];
174 static struct ctl_table fs_table
[];
175 static struct ctl_table debug_table
[];
176 static struct ctl_table dev_table
[];
177 extern struct ctl_table random_table
[];
178 #ifdef CONFIG_INOTIFY_USER
179 extern struct ctl_table inotify_table
[];
182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
183 int sysctl_legacy_va_layout
;
186 extern int prove_locking
;
187 extern int lock_stat
;
189 /* The default sysctl tables: */
191 static struct ctl_table root_table
[] = {
193 .ctl_name
= CTL_KERN
,
194 .procname
= "kernel",
211 .ctl_name
= CTL_DEBUG
,
214 .child
= debug_table
,
223 * NOTE: do not add new entries to this table unless you have read
224 * Documentation/sysctl/ctl_unnumbered.txt
229 #ifdef CONFIG_SCHED_DEBUG
230 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
231 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
232 static int min_wakeup_granularity_ns
; /* 0 usecs */
233 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
236 static struct ctl_table kern_table
[] = {
237 #ifdef CONFIG_SCHED_DEBUG
239 .ctl_name
= CTL_UNNUMBERED
,
240 .procname
= "sched_min_granularity_ns",
241 .data
= &sysctl_sched_min_granularity
,
242 .maxlen
= sizeof(unsigned int),
244 .proc_handler
= &sched_nr_latency_handler
,
245 .strategy
= &sysctl_intvec
,
246 .extra1
= &min_sched_granularity_ns
,
247 .extra2
= &max_sched_granularity_ns
,
250 .ctl_name
= CTL_UNNUMBERED
,
251 .procname
= "sched_latency_ns",
252 .data
= &sysctl_sched_latency
,
253 .maxlen
= sizeof(unsigned int),
255 .proc_handler
= &sched_nr_latency_handler
,
256 .strategy
= &sysctl_intvec
,
257 .extra1
= &min_sched_granularity_ns
,
258 .extra2
= &max_sched_granularity_ns
,
261 .ctl_name
= CTL_UNNUMBERED
,
262 .procname
= "sched_wakeup_granularity_ns",
263 .data
= &sysctl_sched_wakeup_granularity
,
264 .maxlen
= sizeof(unsigned int),
266 .proc_handler
= &proc_dointvec_minmax
,
267 .strategy
= &sysctl_intvec
,
268 .extra1
= &min_wakeup_granularity_ns
,
269 .extra2
= &max_wakeup_granularity_ns
,
272 .ctl_name
= CTL_UNNUMBERED
,
273 .procname
= "sched_batch_wakeup_granularity_ns",
274 .data
= &sysctl_sched_batch_wakeup_granularity
,
275 .maxlen
= sizeof(unsigned int),
277 .proc_handler
= &proc_dointvec_minmax
,
278 .strategy
= &sysctl_intvec
,
279 .extra1
= &min_wakeup_granularity_ns
,
280 .extra2
= &max_wakeup_granularity_ns
,
283 .ctl_name
= CTL_UNNUMBERED
,
284 .procname
= "sched_child_runs_first",
285 .data
= &sysctl_sched_child_runs_first
,
286 .maxlen
= sizeof(unsigned int),
288 .proc_handler
= &proc_dointvec
,
291 .ctl_name
= CTL_UNNUMBERED
,
292 .procname
= "sched_features",
293 .data
= &sysctl_sched_features
,
294 .maxlen
= sizeof(unsigned int),
296 .proc_handler
= &proc_dointvec
,
299 .ctl_name
= CTL_UNNUMBERED
,
300 .procname
= "sched_migration_cost",
301 .data
= &sysctl_sched_migration_cost
,
302 .maxlen
= sizeof(unsigned int),
304 .proc_handler
= &proc_dointvec
,
307 .ctl_name
= CTL_UNNUMBERED
,
308 .procname
= "sched_nr_migrate",
309 .data
= &sysctl_sched_nr_migrate
,
310 .maxlen
= sizeof(unsigned int),
312 .proc_handler
= &proc_dointvec
,
315 .ctl_name
= CTL_UNNUMBERED
,
316 .procname
= "sched_rt_period_ms",
317 .data
= &sysctl_sched_rt_period
,
318 .maxlen
= sizeof(unsigned int),
320 .proc_handler
= &proc_dointvec
,
323 .ctl_name
= CTL_UNNUMBERED
,
324 .procname
= "sched_rt_ratio",
325 .data
= &sysctl_sched_rt_ratio
,
326 .maxlen
= sizeof(unsigned int),
328 .proc_handler
= &proc_dointvec
,
330 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
332 .ctl_name
= CTL_UNNUMBERED
,
333 .procname
= "sched_min_bal_int_shares",
334 .data
= &sysctl_sched_min_bal_int_shares
,
335 .maxlen
= sizeof(unsigned int),
337 .proc_handler
= &proc_dointvec
,
340 .ctl_name
= CTL_UNNUMBERED
,
341 .procname
= "sched_max_bal_int_shares",
342 .data
= &sysctl_sched_max_bal_int_shares
,
343 .maxlen
= sizeof(unsigned int),
345 .proc_handler
= &proc_dointvec
,
350 .ctl_name
= CTL_UNNUMBERED
,
351 .procname
= "sched_compat_yield",
352 .data
= &sysctl_sched_compat_yield
,
353 .maxlen
= sizeof(unsigned int),
355 .proc_handler
= &proc_dointvec
,
357 #ifdef CONFIG_PROVE_LOCKING
359 .ctl_name
= CTL_UNNUMBERED
,
360 .procname
= "prove_locking",
361 .data
= &prove_locking
,
362 .maxlen
= sizeof(int),
364 .proc_handler
= &proc_dointvec
,
367 #ifdef CONFIG_LOCK_STAT
369 .ctl_name
= CTL_UNNUMBERED
,
370 .procname
= "lock_stat",
372 .maxlen
= sizeof(int),
374 .proc_handler
= &proc_dointvec
,
378 .ctl_name
= KERN_PANIC
,
380 .data
= &panic_timeout
,
381 .maxlen
= sizeof(int),
383 .proc_handler
= &proc_dointvec
,
386 .ctl_name
= KERN_CORE_USES_PID
,
387 .procname
= "core_uses_pid",
388 .data
= &core_uses_pid
,
389 .maxlen
= sizeof(int),
391 .proc_handler
= &proc_dointvec
,
393 #ifdef CONFIG_AUDITSYSCALL
395 .ctl_name
= CTL_UNNUMBERED
,
396 .procname
= "audit_argv_kb",
397 .data
= &audit_argv_kb
,
398 .maxlen
= sizeof(int),
400 .proc_handler
= &proc_dointvec
,
404 .ctl_name
= KERN_CORE_PATTERN
,
405 .procname
= "core_pattern",
406 .data
= core_pattern
,
407 .maxlen
= CORENAME_MAX_SIZE
,
409 .proc_handler
= &proc_dostring
,
410 .strategy
= &sysctl_string
,
412 #ifdef CONFIG_PROC_SYSCTL
414 .procname
= "tainted",
416 .maxlen
= sizeof(int),
418 .proc_handler
= &proc_dointvec_taint
,
421 #ifdef CONFIG_LATENCYTOP
423 .procname
= "latencytop",
424 .data
= &latencytop_enabled
,
425 .maxlen
= sizeof(int),
427 .proc_handler
= &proc_dointvec
,
430 #ifdef CONFIG_SECURITY_CAPABILITIES
432 .procname
= "cap-bound",
434 .maxlen
= sizeof(kernel_cap_t
),
436 .proc_handler
= &proc_dointvec_bset
,
438 #endif /* def CONFIG_SECURITY_CAPABILITIES */
439 #ifdef CONFIG_BLK_DEV_INITRD
441 .ctl_name
= KERN_REALROOTDEV
,
442 .procname
= "real-root-dev",
443 .data
= &real_root_dev
,
444 .maxlen
= sizeof(int),
446 .proc_handler
= &proc_dointvec
,
450 .ctl_name
= CTL_UNNUMBERED
,
451 .procname
= "print-fatal-signals",
452 .data
= &print_fatal_signals
,
453 .maxlen
= sizeof(int),
455 .proc_handler
= &proc_dointvec
,
459 .ctl_name
= KERN_SPARC_REBOOT
,
460 .procname
= "reboot-cmd",
461 .data
= reboot_command
,
464 .proc_handler
= &proc_dostring
,
465 .strategy
= &sysctl_string
,
468 .ctl_name
= KERN_SPARC_STOP_A
,
469 .procname
= "stop-a",
470 .data
= &stop_a_enabled
,
471 .maxlen
= sizeof (int),
473 .proc_handler
= &proc_dointvec
,
476 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
477 .procname
= "scons-poweroff",
478 .data
= &scons_pwroff
,
479 .maxlen
= sizeof (int),
481 .proc_handler
= &proc_dointvec
,
486 .ctl_name
= KERN_HPPA_PWRSW
,
487 .procname
= "soft-power",
488 .data
= &pwrsw_enabled
,
489 .maxlen
= sizeof (int),
491 .proc_handler
= &proc_dointvec
,
494 .ctl_name
= KERN_HPPA_UNALIGNED
,
495 .procname
= "unaligned-trap",
496 .data
= &unaligned_enabled
,
497 .maxlen
= sizeof (int),
499 .proc_handler
= &proc_dointvec
,
503 .ctl_name
= KERN_CTLALTDEL
,
504 .procname
= "ctrl-alt-del",
506 .maxlen
= sizeof(int),
508 .proc_handler
= &proc_dointvec
,
511 .ctl_name
= KERN_PRINTK
,
512 .procname
= "printk",
513 .data
= &console_loglevel
,
514 .maxlen
= 4*sizeof(int),
516 .proc_handler
= &proc_dointvec
,
520 .ctl_name
= KERN_MODPROBE
,
521 .procname
= "modprobe",
522 .data
= &modprobe_path
,
523 .maxlen
= KMOD_PATH_LEN
,
525 .proc_handler
= &proc_dostring
,
526 .strategy
= &sysctl_string
,
529 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
531 .ctl_name
= KERN_HOTPLUG
,
532 .procname
= "hotplug",
533 .data
= &uevent_helper
,
534 .maxlen
= UEVENT_HELPER_PATH_LEN
,
536 .proc_handler
= &proc_dostring
,
537 .strategy
= &sysctl_string
,
540 #ifdef CONFIG_CHR_DEV_SG
542 .ctl_name
= KERN_SG_BIG_BUFF
,
543 .procname
= "sg-big-buff",
544 .data
= &sg_big_buff
,
545 .maxlen
= sizeof (int),
547 .proc_handler
= &proc_dointvec
,
550 #ifdef CONFIG_BSD_PROCESS_ACCT
552 .ctl_name
= KERN_ACCT
,
555 .maxlen
= 3*sizeof(int),
557 .proc_handler
= &proc_dointvec
,
560 #ifdef CONFIG_MAGIC_SYSRQ
562 .ctl_name
= KERN_SYSRQ
,
564 .data
= &__sysrq_enabled
,
565 .maxlen
= sizeof (int),
567 .proc_handler
= &proc_dointvec
,
570 #ifdef CONFIG_PROC_SYSCTL
572 .procname
= "cad_pid",
574 .maxlen
= sizeof (int),
576 .proc_handler
= &proc_do_cad_pid
,
580 .ctl_name
= KERN_MAX_THREADS
,
581 .procname
= "threads-max",
582 .data
= &max_threads
,
583 .maxlen
= sizeof(int),
585 .proc_handler
= &proc_dointvec
,
588 .ctl_name
= KERN_RANDOM
,
589 .procname
= "random",
591 .child
= random_table
,
594 .ctl_name
= KERN_OVERFLOWUID
,
595 .procname
= "overflowuid",
596 .data
= &overflowuid
,
597 .maxlen
= sizeof(int),
599 .proc_handler
= &proc_dointvec_minmax
,
600 .strategy
= &sysctl_intvec
,
601 .extra1
= &minolduid
,
602 .extra2
= &maxolduid
,
605 .ctl_name
= KERN_OVERFLOWGID
,
606 .procname
= "overflowgid",
607 .data
= &overflowgid
,
608 .maxlen
= sizeof(int),
610 .proc_handler
= &proc_dointvec_minmax
,
611 .strategy
= &sysctl_intvec
,
612 .extra1
= &minolduid
,
613 .extra2
= &maxolduid
,
616 #ifdef CONFIG_MATHEMU
618 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
619 .procname
= "ieee_emulation_warnings",
620 .data
= &sysctl_ieee_emulation_warnings
,
621 .maxlen
= sizeof(int),
623 .proc_handler
= &proc_dointvec
,
626 #ifdef CONFIG_NO_IDLE_HZ
628 .ctl_name
= KERN_HZ_TIMER
,
629 .procname
= "hz_timer",
630 .data
= &sysctl_hz_timer
,
631 .maxlen
= sizeof(int),
633 .proc_handler
= &proc_dointvec
,
637 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
638 .procname
= "userprocess_debug",
639 .data
= &sysctl_userprocess_debug
,
640 .maxlen
= sizeof(int),
642 .proc_handler
= &proc_dointvec
,
646 .ctl_name
= KERN_PIDMAX
,
647 .procname
= "pid_max",
649 .maxlen
= sizeof (int),
651 .proc_handler
= &proc_dointvec_minmax
,
652 .strategy
= sysctl_intvec
,
653 .extra1
= &pid_max_min
,
654 .extra2
= &pid_max_max
,
657 .ctl_name
= KERN_PANIC_ON_OOPS
,
658 .procname
= "panic_on_oops",
659 .data
= &panic_on_oops
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= &proc_dointvec
,
665 .ctl_name
= KERN_PRINTK_RATELIMIT
,
666 .procname
= "printk_ratelimit",
667 .data
= &printk_ratelimit_jiffies
,
668 .maxlen
= sizeof(int),
670 .proc_handler
= &proc_dointvec_jiffies
,
671 .strategy
= &sysctl_jiffies
,
674 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
675 .procname
= "printk_ratelimit_burst",
676 .data
= &printk_ratelimit_burst
,
677 .maxlen
= sizeof(int),
679 .proc_handler
= &proc_dointvec
,
682 .ctl_name
= KERN_NGROUPS_MAX
,
683 .procname
= "ngroups_max",
684 .data
= &ngroups_max
,
685 .maxlen
= sizeof (int),
687 .proc_handler
= &proc_dointvec
,
689 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
691 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
692 .procname
= "unknown_nmi_panic",
693 .data
= &unknown_nmi_panic
,
694 .maxlen
= sizeof (int),
696 .proc_handler
= &proc_dointvec
,
699 .procname
= "nmi_watchdog",
700 .data
= &nmi_watchdog_enabled
,
701 .maxlen
= sizeof (int),
703 .proc_handler
= &proc_nmi_enabled
,
706 #if defined(CONFIG_X86)
708 .ctl_name
= KERN_PANIC_ON_NMI
,
709 .procname
= "panic_on_unrecovered_nmi",
710 .data
= &panic_on_unrecovered_nmi
,
711 .maxlen
= sizeof(int),
713 .proc_handler
= &proc_dointvec
,
716 .ctl_name
= KERN_BOOTLOADER_TYPE
,
717 .procname
= "bootloader_type",
718 .data
= &bootloader_type
,
719 .maxlen
= sizeof (int),
721 .proc_handler
= &proc_dointvec
,
724 .ctl_name
= CTL_UNNUMBERED
,
725 .procname
= "kstack_depth_to_print",
726 .data
= &kstack_depth_to_print
,
727 .maxlen
= sizeof(int),
729 .proc_handler
= &proc_dointvec
,
732 .ctl_name
= CTL_UNNUMBERED
,
733 .procname
= "io_delay_type",
734 .data
= &io_delay_type
,
735 .maxlen
= sizeof(int),
737 .proc_handler
= &proc_dointvec
,
740 #if defined(CONFIG_MMU)
742 .ctl_name
= KERN_RANDOMIZE
,
743 .procname
= "randomize_va_space",
744 .data
= &randomize_va_space
,
745 .maxlen
= sizeof(int),
747 .proc_handler
= &proc_dointvec
,
750 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
752 .ctl_name
= KERN_SPIN_RETRY
,
753 .procname
= "spin_retry",
755 .maxlen
= sizeof (int),
757 .proc_handler
= &proc_dointvec
,
760 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
762 .procname
= "acpi_video_flags",
763 .data
= &acpi_realmode_flags
,
764 .maxlen
= sizeof (unsigned long),
766 .proc_handler
= &proc_doulongvec_minmax
,
771 .ctl_name
= KERN_IA64_UNALIGNED
,
772 .procname
= "ignore-unaligned-usertrap",
773 .data
= &no_unaligned_warning
,
774 .maxlen
= sizeof (int),
776 .proc_handler
= &proc_dointvec
,
779 #ifdef CONFIG_DETECT_SOFTLOCKUP
781 .ctl_name
= CTL_UNNUMBERED
,
782 .procname
= "softlockup_thresh",
783 .data
= &softlockup_thresh
,
784 .maxlen
= sizeof(unsigned long),
786 .proc_handler
= &proc_doulongvec_minmax
,
787 .strategy
= &sysctl_intvec
,
792 .ctl_name
= CTL_UNNUMBERED
,
793 .procname
= "hung_task_check_count",
794 .data
= &sysctl_hung_task_check_count
,
795 .maxlen
= sizeof(unsigned long),
797 .proc_handler
= &proc_doulongvec_minmax
,
798 .strategy
= &sysctl_intvec
,
801 .ctl_name
= CTL_UNNUMBERED
,
802 .procname
= "hung_task_timeout_secs",
803 .data
= &sysctl_hung_task_timeout_secs
,
804 .maxlen
= sizeof(unsigned long),
806 .proc_handler
= &proc_doulongvec_minmax
,
807 .strategy
= &sysctl_intvec
,
810 .ctl_name
= CTL_UNNUMBERED
,
811 .procname
= "hung_task_warnings",
812 .data
= &sysctl_hung_task_warnings
,
813 .maxlen
= sizeof(unsigned long),
815 .proc_handler
= &proc_doulongvec_minmax
,
816 .strategy
= &sysctl_intvec
,
821 .ctl_name
= KERN_COMPAT_LOG
,
822 .procname
= "compat-log",
824 .maxlen
= sizeof (int),
826 .proc_handler
= &proc_dointvec
,
829 #ifdef CONFIG_RT_MUTEXES
831 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
832 .procname
= "max_lock_depth",
833 .data
= &max_lock_depth
,
834 .maxlen
= sizeof(int),
836 .proc_handler
= &proc_dointvec
,
839 #ifdef CONFIG_PROC_FS
841 .ctl_name
= CTL_UNNUMBERED
,
842 .procname
= "maps_protect",
843 .data
= &maps_protect
,
844 .maxlen
= sizeof(int),
846 .proc_handler
= &proc_dointvec
,
850 .ctl_name
= CTL_UNNUMBERED
,
851 .procname
= "poweroff_cmd",
852 .data
= &poweroff_cmd
,
853 .maxlen
= POWEROFF_CMD_PATH_LEN
,
855 .proc_handler
= &proc_dostring
,
856 .strategy
= &sysctl_string
,
859 * NOTE: do not add new entries to this table unless you have read
860 * Documentation/sysctl/ctl_unnumbered.txt
865 static struct ctl_table vm_table
[] = {
867 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
868 .procname
= "overcommit_memory",
869 .data
= &sysctl_overcommit_memory
,
870 .maxlen
= sizeof(sysctl_overcommit_memory
),
872 .proc_handler
= &proc_dointvec
,
875 .ctl_name
= VM_PANIC_ON_OOM
,
876 .procname
= "panic_on_oom",
877 .data
= &sysctl_panic_on_oom
,
878 .maxlen
= sizeof(sysctl_panic_on_oom
),
880 .proc_handler
= &proc_dointvec
,
883 .ctl_name
= CTL_UNNUMBERED
,
884 .procname
= "oom_kill_allocating_task",
885 .data
= &sysctl_oom_kill_allocating_task
,
886 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
888 .proc_handler
= &proc_dointvec
,
891 .ctl_name
= VM_OVERCOMMIT_RATIO
,
892 .procname
= "overcommit_ratio",
893 .data
= &sysctl_overcommit_ratio
,
894 .maxlen
= sizeof(sysctl_overcommit_ratio
),
896 .proc_handler
= &proc_dointvec
,
899 .ctl_name
= VM_PAGE_CLUSTER
,
900 .procname
= "page-cluster",
901 .data
= &page_cluster
,
902 .maxlen
= sizeof(int),
904 .proc_handler
= &proc_dointvec
,
907 .ctl_name
= VM_DIRTY_BACKGROUND
,
908 .procname
= "dirty_background_ratio",
909 .data
= &dirty_background_ratio
,
910 .maxlen
= sizeof(dirty_background_ratio
),
912 .proc_handler
= &proc_dointvec_minmax
,
913 .strategy
= &sysctl_intvec
,
915 .extra2
= &one_hundred
,
918 .ctl_name
= VM_DIRTY_RATIO
,
919 .procname
= "dirty_ratio",
920 .data
= &vm_dirty_ratio
,
921 .maxlen
= sizeof(vm_dirty_ratio
),
923 .proc_handler
= &dirty_ratio_handler
,
924 .strategy
= &sysctl_intvec
,
926 .extra2
= &one_hundred
,
929 .procname
= "dirty_writeback_centisecs",
930 .data
= &dirty_writeback_interval
,
931 .maxlen
= sizeof(dirty_writeback_interval
),
933 .proc_handler
= &dirty_writeback_centisecs_handler
,
936 .procname
= "dirty_expire_centisecs",
937 .data
= &dirty_expire_interval
,
938 .maxlen
= sizeof(dirty_expire_interval
),
940 .proc_handler
= &proc_dointvec_userhz_jiffies
,
943 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
944 .procname
= "nr_pdflush_threads",
945 .data
= &nr_pdflush_threads
,
946 .maxlen
= sizeof nr_pdflush_threads
,
947 .mode
= 0444 /* read-only*/,
948 .proc_handler
= &proc_dointvec
,
951 .ctl_name
= VM_SWAPPINESS
,
952 .procname
= "swappiness",
953 .data
= &vm_swappiness
,
954 .maxlen
= sizeof(vm_swappiness
),
956 .proc_handler
= &proc_dointvec_minmax
,
957 .strategy
= &sysctl_intvec
,
959 .extra2
= &one_hundred
,
961 #ifdef CONFIG_HUGETLB_PAGE
963 .procname
= "nr_hugepages",
964 .data
= &max_huge_pages
,
965 .maxlen
= sizeof(unsigned long),
967 .proc_handler
= &hugetlb_sysctl_handler
,
968 .extra1
= (void *)&hugetlb_zero
,
969 .extra2
= (void *)&hugetlb_infinity
,
972 .ctl_name
= VM_HUGETLB_GROUP
,
973 .procname
= "hugetlb_shm_group",
974 .data
= &sysctl_hugetlb_shm_group
,
975 .maxlen
= sizeof(gid_t
),
977 .proc_handler
= &proc_dointvec
,
980 .ctl_name
= CTL_UNNUMBERED
,
981 .procname
= "hugepages_treat_as_movable",
982 .data
= &hugepages_treat_as_movable
,
983 .maxlen
= sizeof(int),
985 .proc_handler
= &hugetlb_treat_movable_handler
,
988 .ctl_name
= CTL_UNNUMBERED
,
989 .procname
= "nr_overcommit_hugepages",
990 .data
= &nr_overcommit_huge_pages
,
991 .maxlen
= sizeof(nr_overcommit_huge_pages
),
993 .proc_handler
= &proc_doulongvec_minmax
,
997 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
998 .procname
= "lowmem_reserve_ratio",
999 .data
= &sysctl_lowmem_reserve_ratio
,
1000 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1002 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
1003 .strategy
= &sysctl_intvec
,
1006 .ctl_name
= VM_DROP_PAGECACHE
,
1007 .procname
= "drop_caches",
1008 .data
= &sysctl_drop_caches
,
1009 .maxlen
= sizeof(int),
1011 .proc_handler
= drop_caches_sysctl_handler
,
1012 .strategy
= &sysctl_intvec
,
1015 .ctl_name
= VM_MIN_FREE_KBYTES
,
1016 .procname
= "min_free_kbytes",
1017 .data
= &min_free_kbytes
,
1018 .maxlen
= sizeof(min_free_kbytes
),
1020 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1021 .strategy
= &sysctl_intvec
,
1025 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1026 .procname
= "percpu_pagelist_fraction",
1027 .data
= &percpu_pagelist_fraction
,
1028 .maxlen
= sizeof(percpu_pagelist_fraction
),
1030 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1031 .strategy
= &sysctl_intvec
,
1032 .extra1
= &min_percpu_pagelist_fract
,
1036 .ctl_name
= VM_MAX_MAP_COUNT
,
1037 .procname
= "max_map_count",
1038 .data
= &sysctl_max_map_count
,
1039 .maxlen
= sizeof(sysctl_max_map_count
),
1041 .proc_handler
= &proc_dointvec
1045 .ctl_name
= VM_LAPTOP_MODE
,
1046 .procname
= "laptop_mode",
1047 .data
= &laptop_mode
,
1048 .maxlen
= sizeof(laptop_mode
),
1050 .proc_handler
= &proc_dointvec_jiffies
,
1051 .strategy
= &sysctl_jiffies
,
1054 .ctl_name
= VM_BLOCK_DUMP
,
1055 .procname
= "block_dump",
1056 .data
= &block_dump
,
1057 .maxlen
= sizeof(block_dump
),
1059 .proc_handler
= &proc_dointvec
,
1060 .strategy
= &sysctl_intvec
,
1064 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1065 .procname
= "vfs_cache_pressure",
1066 .data
= &sysctl_vfs_cache_pressure
,
1067 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1069 .proc_handler
= &proc_dointvec
,
1070 .strategy
= &sysctl_intvec
,
1073 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1075 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1076 .procname
= "legacy_va_layout",
1077 .data
= &sysctl_legacy_va_layout
,
1078 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1080 .proc_handler
= &proc_dointvec
,
1081 .strategy
= &sysctl_intvec
,
1087 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1088 .procname
= "zone_reclaim_mode",
1089 .data
= &zone_reclaim_mode
,
1090 .maxlen
= sizeof(zone_reclaim_mode
),
1092 .proc_handler
= &proc_dointvec
,
1093 .strategy
= &sysctl_intvec
,
1097 .ctl_name
= VM_MIN_UNMAPPED
,
1098 .procname
= "min_unmapped_ratio",
1099 .data
= &sysctl_min_unmapped_ratio
,
1100 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1102 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1103 .strategy
= &sysctl_intvec
,
1105 .extra2
= &one_hundred
,
1108 .ctl_name
= VM_MIN_SLAB
,
1109 .procname
= "min_slab_ratio",
1110 .data
= &sysctl_min_slab_ratio
,
1111 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1113 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1114 .strategy
= &sysctl_intvec
,
1116 .extra2
= &one_hundred
,
1121 .ctl_name
= CTL_UNNUMBERED
,
1122 .procname
= "stat_interval",
1123 .data
= &sysctl_stat_interval
,
1124 .maxlen
= sizeof(sysctl_stat_interval
),
1126 .proc_handler
= &proc_dointvec_jiffies
,
1127 .strategy
= &sysctl_jiffies
,
1130 #ifdef CONFIG_SECURITY
1132 .ctl_name
= CTL_UNNUMBERED
,
1133 .procname
= "mmap_min_addr",
1134 .data
= &mmap_min_addr
,
1135 .maxlen
= sizeof(unsigned long),
1137 .proc_handler
= &proc_doulongvec_minmax
,
1142 .ctl_name
= CTL_UNNUMBERED
,
1143 .procname
= "numa_zonelist_order",
1144 .data
= &numa_zonelist_order
,
1145 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1147 .proc_handler
= &numa_zonelist_order_handler
,
1148 .strategy
= &sysctl_string
,
1151 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1152 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1154 .ctl_name
= VM_VDSO_ENABLED
,
1155 .procname
= "vdso_enabled",
1156 .data
= &vdso_enabled
,
1157 .maxlen
= sizeof(vdso_enabled
),
1159 .proc_handler
= &proc_dointvec
,
1160 .strategy
= &sysctl_intvec
,
1165 * NOTE: do not add new entries to this table unless you have read
1166 * Documentation/sysctl/ctl_unnumbered.txt
1171 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1172 static struct ctl_table binfmt_misc_table
[] = {
1177 static struct ctl_table fs_table
[] = {
1179 .ctl_name
= FS_NRINODE
,
1180 .procname
= "inode-nr",
1181 .data
= &inodes_stat
,
1182 .maxlen
= 2*sizeof(int),
1184 .proc_handler
= &proc_dointvec
,
1187 .ctl_name
= FS_STATINODE
,
1188 .procname
= "inode-state",
1189 .data
= &inodes_stat
,
1190 .maxlen
= 7*sizeof(int),
1192 .proc_handler
= &proc_dointvec
,
1195 .procname
= "file-nr",
1196 .data
= &files_stat
,
1197 .maxlen
= 3*sizeof(int),
1199 .proc_handler
= &proc_nr_files
,
1202 .ctl_name
= FS_MAXFILE
,
1203 .procname
= "file-max",
1204 .data
= &files_stat
.max_files
,
1205 .maxlen
= sizeof(int),
1207 .proc_handler
= &proc_dointvec
,
1210 .ctl_name
= FS_DENTRY
,
1211 .procname
= "dentry-state",
1212 .data
= &dentry_stat
,
1213 .maxlen
= 6*sizeof(int),
1215 .proc_handler
= &proc_dointvec
,
1218 .ctl_name
= FS_OVERFLOWUID
,
1219 .procname
= "overflowuid",
1220 .data
= &fs_overflowuid
,
1221 .maxlen
= sizeof(int),
1223 .proc_handler
= &proc_dointvec_minmax
,
1224 .strategy
= &sysctl_intvec
,
1225 .extra1
= &minolduid
,
1226 .extra2
= &maxolduid
,
1229 .ctl_name
= FS_OVERFLOWGID
,
1230 .procname
= "overflowgid",
1231 .data
= &fs_overflowgid
,
1232 .maxlen
= sizeof(int),
1234 .proc_handler
= &proc_dointvec_minmax
,
1235 .strategy
= &sysctl_intvec
,
1236 .extra1
= &minolduid
,
1237 .extra2
= &maxolduid
,
1240 .ctl_name
= FS_LEASES
,
1241 .procname
= "leases-enable",
1242 .data
= &leases_enable
,
1243 .maxlen
= sizeof(int),
1245 .proc_handler
= &proc_dointvec
,
1247 #ifdef CONFIG_DNOTIFY
1249 .ctl_name
= FS_DIR_NOTIFY
,
1250 .procname
= "dir-notify-enable",
1251 .data
= &dir_notify_enable
,
1252 .maxlen
= sizeof(int),
1254 .proc_handler
= &proc_dointvec
,
1259 .ctl_name
= FS_LEASE_TIME
,
1260 .procname
= "lease-break-time",
1261 .data
= &lease_break_time
,
1262 .maxlen
= sizeof(int),
1264 .proc_handler
= &proc_dointvec_minmax
,
1265 .strategy
= &sysctl_intvec
,
1270 .procname
= "aio-nr",
1272 .maxlen
= sizeof(aio_nr
),
1274 .proc_handler
= &proc_doulongvec_minmax
,
1277 .procname
= "aio-max-nr",
1278 .data
= &aio_max_nr
,
1279 .maxlen
= sizeof(aio_max_nr
),
1281 .proc_handler
= &proc_doulongvec_minmax
,
1283 #ifdef CONFIG_INOTIFY_USER
1285 .ctl_name
= FS_INOTIFY
,
1286 .procname
= "inotify",
1288 .child
= inotify_table
,
1293 .ctl_name
= KERN_SETUID_DUMPABLE
,
1294 .procname
= "suid_dumpable",
1295 .data
= &suid_dumpable
,
1296 .maxlen
= sizeof(int),
1298 .proc_handler
= &proc_dointvec
,
1300 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1302 .ctl_name
= CTL_UNNUMBERED
,
1303 .procname
= "binfmt_misc",
1305 .child
= binfmt_misc_table
,
1309 * NOTE: do not add new entries to this table unless you have read
1310 * Documentation/sysctl/ctl_unnumbered.txt
1315 static struct ctl_table debug_table
[] = {
1316 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1318 .ctl_name
= CTL_UNNUMBERED
,
1319 .procname
= "exception-trace",
1320 .data
= &show_unhandled_signals
,
1321 .maxlen
= sizeof(int),
1323 .proc_handler
= proc_dointvec
1329 static struct ctl_table dev_table
[] = {
1333 static DEFINE_SPINLOCK(sysctl_lock
);
1335 /* called under sysctl_lock */
1336 static int use_table(struct ctl_table_header
*p
)
1338 if (unlikely(p
->unregistering
))
1344 /* called under sysctl_lock */
1345 static void unuse_table(struct ctl_table_header
*p
)
1348 if (unlikely(p
->unregistering
))
1349 complete(p
->unregistering
);
1352 /* called under sysctl_lock, will reacquire if has to wait */
1353 static void start_unregistering(struct ctl_table_header
*p
)
1356 * if p->used is 0, nobody will ever touch that entry again;
1357 * we'll eliminate all paths to it before dropping sysctl_lock
1359 if (unlikely(p
->used
)) {
1360 struct completion wait
;
1361 init_completion(&wait
);
1362 p
->unregistering
= &wait
;
1363 spin_unlock(&sysctl_lock
);
1364 wait_for_completion(&wait
);
1365 spin_lock(&sysctl_lock
);
1368 * do not remove from the list until nobody holds it; walking the
1369 * list in do_sysctl() relies on that.
1371 list_del_init(&p
->ctl_entry
);
1374 void sysctl_head_finish(struct ctl_table_header
*head
)
1378 spin_lock(&sysctl_lock
);
1380 spin_unlock(&sysctl_lock
);
1383 static struct list_head
*
1384 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1386 struct list_head
*header_list
;
1387 header_list
= &root
->header_list
;
1389 header_list
= root
->lookup(root
, namespaces
);
1393 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1394 struct ctl_table_header
*prev
)
1396 struct ctl_table_root
*root
;
1397 struct list_head
*header_list
;
1398 struct ctl_table_header
*head
;
1399 struct list_head
*tmp
;
1401 spin_lock(&sysctl_lock
);
1404 tmp
= &prev
->ctl_entry
;
1408 tmp
= &root_table_header
.ctl_entry
;
1410 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1412 if (!use_table(head
))
1414 spin_unlock(&sysctl_lock
);
1419 header_list
= lookup_header_list(root
, namespaces
);
1420 if (tmp
!= header_list
)
1424 root
= list_entry(root
->root_list
.next
,
1425 struct ctl_table_root
, root_list
);
1426 if (root
== &sysctl_table_root
)
1428 header_list
= lookup_header_list(root
, namespaces
);
1429 } while (list_empty(header_list
));
1430 tmp
= header_list
->next
;
1433 spin_unlock(&sysctl_lock
);
1437 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1439 return __sysctl_head_next(current
->nsproxy
, prev
);
1442 void register_sysctl_root(struct ctl_table_root
*root
)
1444 spin_lock(&sysctl_lock
);
1445 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1446 spin_unlock(&sysctl_lock
);
1449 #ifdef CONFIG_SYSCTL_SYSCALL
1450 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1451 void __user
*newval
, size_t newlen
)
1453 struct ctl_table_header
*head
;
1454 int error
= -ENOTDIR
;
1456 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1460 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1464 for (head
= sysctl_head_next(NULL
); head
;
1465 head
= sysctl_head_next(head
)) {
1466 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1467 newval
, newlen
, head
->ctl_table
);
1468 if (error
!= -ENOTDIR
) {
1469 sysctl_head_finish(head
);
1476 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1478 struct __sysctl_args tmp
;
1481 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1484 error
= deprecated_sysctl_warning(&tmp
);
1489 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1490 tmp
.newval
, tmp
.newlen
);
1495 #endif /* CONFIG_SYSCTL_SYSCALL */
1498 * sysctl_perm does NOT grant the superuser all rights automatically, because
1499 * some sysctl variables are readonly even to root.
1502 static int test_perm(int mode
, int op
)
1506 else if (in_egroup_p(0))
1508 if ((mode
& op
& 0007) == op
)
1513 int sysctl_perm(struct ctl_table
*table
, int op
)
1516 error
= security_sysctl(table
, op
);
1519 return test_perm(table
->mode
, op
);
1522 #ifdef CONFIG_SYSCTL_SYSCALL
1523 static int parse_table(int __user
*name
, int nlen
,
1524 void __user
*oldval
, size_t __user
*oldlenp
,
1525 void __user
*newval
, size_t newlen
,
1526 struct ctl_table
*table
)
1532 if (get_user(n
, name
))
1534 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1535 if (!table
->ctl_name
)
1537 if (n
== table
->ctl_name
) {
1540 if (sysctl_perm(table
, 001))
1544 table
= table
->child
;
1547 error
= do_sysctl_strategy(table
, name
, nlen
,
1556 /* Perform the actual read/write of a sysctl table entry. */
1557 int do_sysctl_strategy (struct ctl_table
*table
,
1558 int __user
*name
, int nlen
,
1559 void __user
*oldval
, size_t __user
*oldlenp
,
1560 void __user
*newval
, size_t newlen
)
1568 if (sysctl_perm(table
, op
))
1571 if (table
->strategy
) {
1572 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1580 /* If there is no strategy routine, or if the strategy returns
1581 * zero, proceed with automatic r/w */
1582 if (table
->data
&& table
->maxlen
) {
1583 rc
= sysctl_data(table
, name
, nlen
, oldval
, oldlenp
,
1590 #endif /* CONFIG_SYSCTL_SYSCALL */
1592 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1594 for (; table
->ctl_name
|| table
->procname
; table
++) {
1595 table
->parent
= parent
;
1597 sysctl_set_parent(table
, table
->child
);
1601 static __init
int sysctl_init(void)
1604 sysctl_set_parent(NULL
, root_table
);
1605 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1609 core_initcall(sysctl_init
);
1612 * __register_sysctl_paths - register a sysctl hierarchy
1613 * @root: List of sysctl headers to register on
1614 * @namespaces: Data to compute which lists of sysctl entries are visible
1615 * @path: The path to the directory the sysctl table is in.
1616 * @table: the top-level table structure
1618 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1619 * array. A completely 0 filled entry terminates the table.
1621 * The members of the &struct ctl_table structure are used as follows:
1623 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1624 * must be unique within that level of sysctl
1626 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1627 * enter a sysctl file
1629 * data - a pointer to data for use by proc_handler
1631 * maxlen - the maximum size in bytes of the data
1633 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1635 * child - a pointer to the child sysctl table if this entry is a directory, or
1638 * proc_handler - the text handler routine (described below)
1640 * strategy - the strategy routine (described below)
1642 * de - for internal use by the sysctl routines
1644 * extra1, extra2 - extra pointers usable by the proc handler routines
1646 * Leaf nodes in the sysctl tree will be represented by a single file
1647 * under /proc; non-leaf nodes will be represented by directories.
1649 * sysctl(2) can automatically manage read and write requests through
1650 * the sysctl table. The data and maxlen fields of the ctl_table
1651 * struct enable minimal validation of the values being written to be
1652 * performed, and the mode field allows minimal authentication.
1654 * More sophisticated management can be enabled by the provision of a
1655 * strategy routine with the table entry. This will be called before
1656 * any automatic read or write of the data is performed.
1658 * The strategy routine may return
1660 * < 0 - Error occurred (error is passed to user process)
1662 * 0 - OK - proceed with automatic read or write.
1664 * > 0 - OK - read or write has been done by the strategy routine, so
1665 * return immediately.
1667 * There must be a proc_handler routine for any terminal nodes
1668 * mirrored under /proc/sys (non-terminals are handled by a built-in
1669 * directory handler). Several default handlers are available to
1670 * cover common cases -
1672 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1673 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1674 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1676 * It is the handler's job to read the input buffer from user memory
1677 * and process it. The handler should return 0 on success.
1679 * This routine returns %NULL on a failure to register, and a pointer
1680 * to the table header on success.
1682 struct ctl_table_header
*__register_sysctl_paths(
1683 struct ctl_table_root
*root
,
1684 struct nsproxy
*namespaces
,
1685 const struct ctl_path
*path
, struct ctl_table
*table
)
1687 struct list_head
*header_list
;
1688 struct ctl_table_header
*header
;
1689 struct ctl_table
*new, **prevp
;
1690 unsigned int n
, npath
;
1692 /* Count the path components */
1693 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1697 * For each path component, allocate a 2-element ctl_table array.
1698 * The first array element will be filled with the sysctl entry
1699 * for this, the second will be the sentinel (ctl_name == 0).
1701 * We allocate everything in one go so that we don't have to
1702 * worry about freeing additional memory in unregister_sysctl_table.
1704 header
= kzalloc(sizeof(struct ctl_table_header
) +
1705 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1709 new = (struct ctl_table
*) (header
+ 1);
1711 /* Now connect the dots */
1712 prevp
= &header
->ctl_table
;
1713 for (n
= 0; n
< npath
; ++n
, ++path
) {
1714 /* Copy the procname */
1715 new->procname
= path
->procname
;
1716 new->ctl_name
= path
->ctl_name
;
1720 prevp
= &new->child
;
1725 header
->ctl_table_arg
= table
;
1727 INIT_LIST_HEAD(&header
->ctl_entry
);
1729 header
->unregistering
= NULL
;
1730 header
->root
= root
;
1731 sysctl_set_parent(NULL
, header
->ctl_table
);
1732 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
1736 spin_lock(&sysctl_lock
);
1737 header_list
= lookup_header_list(root
, namespaces
);
1738 list_add_tail(&header
->ctl_entry
, header_list
);
1739 spin_unlock(&sysctl_lock
);
1745 * register_sysctl_table_path - register a sysctl table hierarchy
1746 * @path: The path to the directory the sysctl table is in.
1747 * @table: the top-level table structure
1749 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1750 * array. A completely 0 filled entry terminates the table.
1752 * See __register_sysctl_paths for more details.
1754 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1755 struct ctl_table
*table
)
1757 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
1762 * register_sysctl_table - register a sysctl table hierarchy
1763 * @table: the top-level table structure
1765 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1766 * array. A completely 0 filled entry terminates the table.
1768 * See register_sysctl_paths for more details.
1770 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
1772 static const struct ctl_path null_path
[] = { {} };
1774 return register_sysctl_paths(null_path
, table
);
1778 * unregister_sysctl_table - unregister a sysctl table hierarchy
1779 * @header: the header returned from register_sysctl_table
1781 * Unregisters the sysctl table and all children. proc entries may not
1782 * actually be removed until they are no longer used by anyone.
1784 void unregister_sysctl_table(struct ctl_table_header
* header
)
1791 spin_lock(&sysctl_lock
);
1792 start_unregistering(header
);
1793 spin_unlock(&sysctl_lock
);
1797 #else /* !CONFIG_SYSCTL */
1798 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
1803 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1804 struct ctl_table
*table
)
1809 void unregister_sysctl_table(struct ctl_table_header
* table
)
1813 #endif /* CONFIG_SYSCTL */
1819 #ifdef CONFIG_PROC_SYSCTL
1821 static int _proc_do_string(void* data
, int maxlen
, int write
,
1822 struct file
*filp
, void __user
*buffer
,
1823 size_t *lenp
, loff_t
*ppos
)
1829 if (!data
|| !maxlen
|| !*lenp
) {
1837 while (len
< *lenp
) {
1838 if (get_user(c
, p
++))
1840 if (c
== 0 || c
== '\n')
1846 if(copy_from_user(data
, buffer
, len
))
1848 ((char *) data
)[len
] = 0;
1866 if(copy_to_user(buffer
, data
, len
))
1869 if(put_user('\n', ((char __user
*) buffer
) + len
))
1880 * proc_dostring - read a string sysctl
1881 * @table: the sysctl table
1882 * @write: %TRUE if this is a write to the sysctl file
1883 * @filp: the file structure
1884 * @buffer: the user buffer
1885 * @lenp: the size of the user buffer
1886 * @ppos: file position
1888 * Reads/writes a string from/to the user buffer. If the kernel
1889 * buffer provided is not large enough to hold the string, the
1890 * string is truncated. The copied string is %NULL-terminated.
1891 * If the string is being read by the user process, it is copied
1892 * and a newline '\n' is added. It is truncated if the buffer is
1895 * Returns 0 on success.
1897 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
1898 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1900 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1901 buffer
, lenp
, ppos
);
1905 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1907 int write
, void *data
)
1910 *valp
= *negp
? -*lvalp
: *lvalp
;
1915 *lvalp
= (unsigned long)-val
;
1918 *lvalp
= (unsigned long)val
;
1924 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1925 int write
, struct file
*filp
, void __user
*buffer
,
1926 size_t *lenp
, loff_t
*ppos
,
1927 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1928 int write
, void *data
),
1931 #define TMPBUFLEN 21
1932 int *i
, vleft
, first
=1, neg
, val
;
1936 char buf
[TMPBUFLEN
], *p
;
1937 char __user
*s
= buffer
;
1939 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1940 (*ppos
&& !write
)) {
1945 i
= (int *) tbl_data
;
1946 vleft
= table
->maxlen
/ sizeof(*i
);
1950 conv
= do_proc_dointvec_conv
;
1952 for (; left
&& vleft
--; i
++, first
=0) {
1967 if (len
> sizeof(buf
) - 1)
1968 len
= sizeof(buf
) - 1;
1969 if (copy_from_user(buf
, s
, len
))
1973 if (*p
== '-' && left
> 1) {
1977 if (*p
< '0' || *p
> '9')
1980 lval
= simple_strtoul(p
, &p
, 0);
1983 if ((len
< left
) && *p
&& !isspace(*p
))
1990 if (conv(&neg
, &lval
, i
, 1, data
))
1997 if (conv(&neg
, &lval
, i
, 0, data
))
2000 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2004 if(copy_to_user(s
, buf
, len
))
2011 if (!write
&& !first
&& left
) {
2012 if(put_user('\n', s
))
2019 if (get_user(c
, s
++))
2034 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2035 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2036 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2037 int write
, void *data
),
2040 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2041 buffer
, lenp
, ppos
, conv
, data
);
2045 * proc_dointvec - read a vector of integers
2046 * @table: the sysctl table
2047 * @write: %TRUE if this is a write to the sysctl file
2048 * @filp: the file structure
2049 * @buffer: the user buffer
2050 * @lenp: the size of the user buffer
2051 * @ppos: file position
2053 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2054 * values from/to the user buffer, treated as an ASCII string.
2056 * Returns 0 on success.
2058 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2059 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2061 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2069 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
2071 int write
, void *data
)
2073 int op
= *(int *)data
;
2075 int val
= *negp
? -*lvalp
: *lvalp
;
2077 case OP_SET
: *valp
= val
; break;
2078 case OP_AND
: *valp
&= val
; break;
2079 case OP_OR
: *valp
|= val
; break;
2085 *lvalp
= (unsigned long)-val
;
2088 *lvalp
= (unsigned long)val
;
2094 #ifdef CONFIG_SECURITY_CAPABILITIES
2096 * init may raise the set.
2099 int proc_dointvec_bset(struct ctl_table
*table
, int write
, struct file
*filp
,
2100 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2104 if (write
&& !capable(CAP_SYS_MODULE
)) {
2108 op
= is_global_init(current
) ? OP_SET
: OP_AND
;
2109 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2110 do_proc_dointvec_bset_conv
,&op
);
2112 #endif /* def CONFIG_SECURITY_CAPABILITIES */
2115 * Taint values can only be increased
2117 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2118 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2122 if (write
&& !capable(CAP_SYS_ADMIN
))
2126 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2127 do_proc_dointvec_bset_conv
,&op
);
2130 struct do_proc_dointvec_minmax_conv_param
{
2135 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2137 int write
, void *data
)
2139 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2141 int val
= *negp
? -*lvalp
: *lvalp
;
2142 if ((param
->min
&& *param
->min
> val
) ||
2143 (param
->max
&& *param
->max
< val
))
2150 *lvalp
= (unsigned long)-val
;
2153 *lvalp
= (unsigned long)val
;
2160 * proc_dointvec_minmax - read a vector of integers with min/max values
2161 * @table: the sysctl table
2162 * @write: %TRUE if this is a write to the sysctl file
2163 * @filp: the file structure
2164 * @buffer: the user buffer
2165 * @lenp: the size of the user buffer
2166 * @ppos: file position
2168 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2169 * values from/to the user buffer, treated as an ASCII string.
2171 * This routine will ensure the values are within the range specified by
2172 * table->extra1 (min) and table->extra2 (max).
2174 * Returns 0 on success.
2176 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2177 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2179 struct do_proc_dointvec_minmax_conv_param param
= {
2180 .min
= (int *) table
->extra1
,
2181 .max
= (int *) table
->extra2
,
2183 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2184 do_proc_dointvec_minmax_conv
, ¶m
);
2187 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2189 void __user
*buffer
,
2190 size_t *lenp
, loff_t
*ppos
,
2191 unsigned long convmul
,
2192 unsigned long convdiv
)
2194 #define TMPBUFLEN 21
2195 unsigned long *i
, *min
, *max
, val
;
2196 int vleft
, first
=1, neg
;
2198 char buf
[TMPBUFLEN
], *p
;
2199 char __user
*s
= buffer
;
2201 if (!data
|| !table
->maxlen
|| !*lenp
||
2202 (*ppos
&& !write
)) {
2207 i
= (unsigned long *) data
;
2208 min
= (unsigned long *) table
->extra1
;
2209 max
= (unsigned long *) table
->extra2
;
2210 vleft
= table
->maxlen
/ sizeof(unsigned long);
2213 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2228 if (len
> TMPBUFLEN
-1)
2230 if (copy_from_user(buf
, s
, len
))
2234 if (*p
== '-' && left
> 1) {
2238 if (*p
< '0' || *p
> '9')
2240 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2242 if ((len
< left
) && *p
&& !isspace(*p
))
2251 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2258 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2262 if(copy_to_user(s
, buf
, len
))
2269 if (!write
&& !first
&& left
) {
2270 if(put_user('\n', s
))
2277 if (get_user(c
, s
++))
2292 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2294 void __user
*buffer
,
2295 size_t *lenp
, loff_t
*ppos
,
2296 unsigned long convmul
,
2297 unsigned long convdiv
)
2299 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2300 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2304 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2305 * @table: the sysctl table
2306 * @write: %TRUE if this is a write to the sysctl file
2307 * @filp: the file structure
2308 * @buffer: the user buffer
2309 * @lenp: the size of the user buffer
2310 * @ppos: file position
2312 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2313 * values from/to the user buffer, treated as an ASCII string.
2315 * This routine will ensure the values are within the range specified by
2316 * table->extra1 (min) and table->extra2 (max).
2318 * Returns 0 on success.
2320 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2321 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2323 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2327 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2328 * @table: the sysctl table
2329 * @write: %TRUE if this is a write to the sysctl file
2330 * @filp: the file structure
2331 * @buffer: the user buffer
2332 * @lenp: the size of the user buffer
2333 * @ppos: file position
2335 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2336 * values from/to the user buffer, treated as an ASCII string. The values
2337 * are treated as milliseconds, and converted to jiffies when they are stored.
2339 * This routine will ensure the values are within the range specified by
2340 * table->extra1 (min) and table->extra2 (max).
2342 * Returns 0 on success.
2344 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2346 void __user
*buffer
,
2347 size_t *lenp
, loff_t
*ppos
)
2349 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2350 lenp
, ppos
, HZ
, 1000l);
2354 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2356 int write
, void *data
)
2359 if (*lvalp
> LONG_MAX
/ HZ
)
2361 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2367 lval
= (unsigned long)-val
;
2370 lval
= (unsigned long)val
;
2377 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2379 int write
, void *data
)
2382 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2384 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2390 lval
= (unsigned long)-val
;
2393 lval
= (unsigned long)val
;
2395 *lvalp
= jiffies_to_clock_t(lval
);
2400 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2402 int write
, void *data
)
2405 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2411 lval
= (unsigned long)-val
;
2414 lval
= (unsigned long)val
;
2416 *lvalp
= jiffies_to_msecs(lval
);
2422 * proc_dointvec_jiffies - read a vector of integers as seconds
2423 * @table: the sysctl table
2424 * @write: %TRUE if this is a write to the sysctl file
2425 * @filp: the file structure
2426 * @buffer: the user buffer
2427 * @lenp: the size of the user buffer
2428 * @ppos: file position
2430 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2431 * values from/to the user buffer, treated as an ASCII string.
2432 * The values read are assumed to be in seconds, and are converted into
2435 * Returns 0 on success.
2437 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2438 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2440 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2441 do_proc_dointvec_jiffies_conv
,NULL
);
2445 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2446 * @table: the sysctl table
2447 * @write: %TRUE if this is a write to the sysctl file
2448 * @filp: the file structure
2449 * @buffer: the user buffer
2450 * @lenp: the size of the user buffer
2451 * @ppos: pointer to the file position
2453 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2454 * values from/to the user buffer, treated as an ASCII string.
2455 * The values read are assumed to be in 1/USER_HZ seconds, and
2456 * are converted into jiffies.
2458 * Returns 0 on success.
2460 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2461 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2463 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2464 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2468 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2469 * @table: the sysctl table
2470 * @write: %TRUE if this is a write to the sysctl file
2471 * @filp: the file structure
2472 * @buffer: the user buffer
2473 * @lenp: the size of the user buffer
2474 * @ppos: file position
2475 * @ppos: the current position in the file
2477 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2478 * values from/to the user buffer, treated as an ASCII string.
2479 * The values read are assumed to be in 1/1000 seconds, and
2480 * are converted into jiffies.
2482 * Returns 0 on success.
2484 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2485 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2487 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2488 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2491 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2492 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2494 struct pid
*new_pid
;
2498 tmp
= pid_nr_ns(cad_pid
, current
->nsproxy
->pid_ns
);
2500 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2501 lenp
, ppos
, NULL
, NULL
);
2505 new_pid
= find_get_pid(tmp
);
2509 put_pid(xchg(&cad_pid
, new_pid
));
2513 #else /* CONFIG_PROC_FS */
2515 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2516 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2521 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2522 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2527 int proc_dointvec_bset(struct ctl_table
*table
, int write
, struct file
*filp
,
2528 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2533 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2534 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2539 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2540 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2545 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2546 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2551 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2552 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2557 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2558 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2563 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2565 void __user
*buffer
,
2566 size_t *lenp
, loff_t
*ppos
)
2572 #endif /* CONFIG_PROC_FS */
2575 #ifdef CONFIG_SYSCTL_SYSCALL
2577 * General sysctl support routines
2580 /* The generic sysctl data routine (used if no strategy routine supplied) */
2581 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2582 void __user
*oldval
, size_t __user
*oldlenp
,
2583 void __user
*newval
, size_t newlen
)
2587 /* Get out of I don't have a variable */
2588 if (!table
->data
|| !table
->maxlen
)
2591 if (oldval
&& oldlenp
) {
2592 if (get_user(len
, oldlenp
))
2595 if (len
> table
->maxlen
)
2596 len
= table
->maxlen
;
2597 if (copy_to_user(oldval
, table
->data
, len
))
2599 if (put_user(len
, oldlenp
))
2604 if (newval
&& newlen
) {
2605 if (newlen
> table
->maxlen
)
2606 newlen
= table
->maxlen
;
2608 if (copy_from_user(table
->data
, newval
, newlen
))
2614 /* The generic string strategy routine: */
2615 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2616 void __user
*oldval
, size_t __user
*oldlenp
,
2617 void __user
*newval
, size_t newlen
)
2619 if (!table
->data
|| !table
->maxlen
)
2622 if (oldval
&& oldlenp
) {
2624 if (get_user(bufsize
, oldlenp
))
2627 size_t len
= strlen(table
->data
), copied
;
2629 /* This shouldn't trigger for a well-formed sysctl */
2630 if (len
> table
->maxlen
)
2631 len
= table
->maxlen
;
2633 /* Copy up to a max of bufsize-1 bytes of the string */
2634 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2636 if (copy_to_user(oldval
, table
->data
, copied
) ||
2637 put_user(0, (char __user
*)(oldval
+ copied
)))
2639 if (put_user(len
, oldlenp
))
2643 if (newval
&& newlen
) {
2644 size_t len
= newlen
;
2645 if (len
> table
->maxlen
)
2646 len
= table
->maxlen
;
2647 if(copy_from_user(table
->data
, newval
, len
))
2649 if (len
== table
->maxlen
)
2651 ((char *) table
->data
)[len
] = 0;
2657 * This function makes sure that all of the integers in the vector
2658 * are between the minimum and maximum values given in the arrays
2659 * table->extra1 and table->extra2, respectively.
2661 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2662 void __user
*oldval
, size_t __user
*oldlenp
,
2663 void __user
*newval
, size_t newlen
)
2666 if (newval
&& newlen
) {
2667 int __user
*vec
= (int __user
*) newval
;
2668 int *min
= (int *) table
->extra1
;
2669 int *max
= (int *) table
->extra2
;
2673 if (newlen
% sizeof(int) != 0)
2676 if (!table
->extra1
&& !table
->extra2
)
2679 if (newlen
> table
->maxlen
)
2680 newlen
= table
->maxlen
;
2681 length
= newlen
/ sizeof(int);
2683 for (i
= 0; i
< length
; i
++) {
2685 if (get_user(value
, vec
+ i
))
2687 if (min
&& value
< min
[i
])
2689 if (max
&& value
> max
[i
])
2696 /* Strategy function to convert jiffies to seconds */
2697 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2698 void __user
*oldval
, size_t __user
*oldlenp
,
2699 void __user
*newval
, size_t newlen
)
2701 if (oldval
&& oldlenp
) {
2704 if (get_user(olen
, oldlenp
))
2709 if (olen
< sizeof(int))
2712 val
= *(int *)(table
->data
) / HZ
;
2713 if (put_user(val
, (int __user
*)oldval
))
2715 if (put_user(sizeof(int), oldlenp
))
2719 if (newval
&& newlen
) {
2721 if (newlen
!= sizeof(int))
2723 if (get_user(new, (int __user
*)newval
))
2725 *(int *)(table
->data
) = new*HZ
;
2730 /* Strategy function to convert jiffies to seconds */
2731 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2732 void __user
*oldval
, size_t __user
*oldlenp
,
2733 void __user
*newval
, size_t newlen
)
2735 if (oldval
&& oldlenp
) {
2738 if (get_user(olen
, oldlenp
))
2743 if (olen
< sizeof(int))
2746 val
= jiffies_to_msecs(*(int *)(table
->data
));
2747 if (put_user(val
, (int __user
*)oldval
))
2749 if (put_user(sizeof(int), oldlenp
))
2753 if (newval
&& newlen
) {
2755 if (newlen
!= sizeof(int))
2757 if (get_user(new, (int __user
*)newval
))
2759 *(int *)(table
->data
) = msecs_to_jiffies(new);
2766 #else /* CONFIG_SYSCTL_SYSCALL */
2769 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2771 struct __sysctl_args tmp
;
2774 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2777 error
= deprecated_sysctl_warning(&tmp
);
2779 /* If no error reading the parameters then just -ENOSYS ... */
2786 int sysctl_data(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_string(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_intvec(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 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2808 void __user
*oldval
, size_t __user
*oldlenp
,
2809 void __user
*newval
, size_t newlen
)
2814 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2815 void __user
*oldval
, size_t __user
*oldlenp
,
2816 void __user
*newval
, size_t newlen
)
2821 #endif /* CONFIG_SYSCTL_SYSCALL */
2823 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
2825 static int msg_count
;
2826 int name
[CTL_MAXNAME
];
2829 /* Check args->nlen. */
2830 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
2833 /* Read in the sysctl name for better debug message logging */
2834 for (i
= 0; i
< args
->nlen
; i
++)
2835 if (get_user(name
[i
], args
->name
+ i
))
2838 /* Ignore accesses to kernel.version */
2839 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2842 if (msg_count
< 5) {
2845 "warning: process `%s' used the deprecated sysctl "
2846 "system call with ", current
->comm
);
2847 for (i
= 0; i
< args
->nlen
; i
++)
2848 printk("%d.", name
[i
]);
2855 * No sense putting this after each symbol definition, twice,
2856 * exception granted :-)
2858 EXPORT_SYMBOL(proc_dointvec
);
2859 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2860 EXPORT_SYMBOL(proc_dointvec_minmax
);
2861 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2862 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2863 EXPORT_SYMBOL(proc_dostring
);
2864 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2865 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2866 EXPORT_SYMBOL(register_sysctl_table
);
2867 EXPORT_SYMBOL(register_sysctl_paths
);
2868 EXPORT_SYMBOL(sysctl_intvec
);
2869 EXPORT_SYMBOL(sysctl_jiffies
);
2870 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2871 EXPORT_SYMBOL(sysctl_string
);
2872 EXPORT_SYMBOL(sysctl_data
);
2873 EXPORT_SYMBOL(unregister_sysctl_table
);