2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
51 #include <linux/slow-work.h>
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
58 #include <asm/stacktrace.h>
62 static int deprecated_sysctl_warning(struct __sysctl_args
*args
);
64 #if defined(CONFIG_SYSCTL)
66 /* External variables not in a header file. */
68 extern int print_fatal_signals
;
69 extern int sysctl_overcommit_memory
;
70 extern int sysctl_overcommit_ratio
;
71 extern int sysctl_panic_on_oom
;
72 extern int sysctl_oom_kill_allocating_task
;
73 extern int sysctl_oom_dump_tasks
;
74 extern int max_threads
;
75 extern int core_uses_pid
;
76 extern int suid_dumpable
;
77 extern char core_pattern
[];
79 extern int min_free_kbytes
;
80 extern int pid_max_min
, pid_max_max
;
81 extern int sysctl_drop_caches
;
82 extern int percpu_pagelist_fraction
;
83 extern int compat_log
;
84 extern int latencytop_enabled
;
85 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
87 extern int sysctl_nr_trim_pages
;
89 #ifdef CONFIG_RCU_TORTURE_TEST
90 extern int rcutorture_runnable
;
91 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
93 /* Constants used for minimum and maximum */
94 #ifdef CONFIG_DETECT_SOFTLOCKUP
95 static int sixty
= 60;
96 static int neg_one
= -1;
100 static int __maybe_unused one
= 1;
101 static int __maybe_unused two
= 2;
102 static unsigned long one_ul
= 1;
103 static int one_hundred
= 100;
105 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
106 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
108 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
109 static int maxolduid
= 65535;
110 static int minolduid
;
111 static int min_percpu_pagelist_fract
= 8;
113 static int ngroups_max
= NGROUPS_MAX
;
115 #ifdef CONFIG_MODULES
116 extern char modprobe_path
[];
118 #ifdef CONFIG_CHR_DEV_SG
119 extern int sg_big_buff
;
123 #include <asm/system.h>
126 #ifdef CONFIG_SPARC64
127 extern int sysctl_tsb_ratio
;
131 extern int pwrsw_enabled
;
132 extern int unaligned_enabled
;
136 #ifdef CONFIG_MATHEMU
137 extern int sysctl_ieee_emulation_warnings
;
139 extern int sysctl_userprocess_debug
;
140 extern int spin_retry
;
143 #ifdef CONFIG_BSD_PROCESS_ACCT
144 extern int acct_parm
[];
148 extern int no_unaligned_warning
;
149 extern int unaligned_dump_stack
;
152 #ifdef CONFIG_RT_MUTEXES
153 extern int max_lock_depth
;
156 #ifdef CONFIG_PROC_SYSCTL
157 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
158 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
159 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
160 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
163 static struct ctl_table root_table
[];
164 static struct ctl_table_root sysctl_table_root
;
165 static struct ctl_table_header root_table_header
= {
167 .ctl_table
= root_table
,
168 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.default_set
.list
),
169 .root
= &sysctl_table_root
,
170 .set
= &sysctl_table_root
.default_set
,
172 static struct ctl_table_root sysctl_table_root
= {
173 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
174 .default_set
.list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
177 static struct ctl_table kern_table
[];
178 static struct ctl_table vm_table
[];
179 static struct ctl_table fs_table
[];
180 static struct ctl_table debug_table
[];
181 static struct ctl_table dev_table
[];
182 extern struct ctl_table random_table
[];
183 #ifdef CONFIG_INOTIFY_USER
184 extern struct ctl_table inotify_table
[];
187 extern struct ctl_table epoll_table
[];
190 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
191 int sysctl_legacy_va_layout
;
194 extern int prove_locking
;
195 extern int lock_stat
;
197 /* The default sysctl tables: */
199 static struct ctl_table root_table
[] = {
201 .ctl_name
= CTL_KERN
,
202 .procname
= "kernel",
219 .ctl_name
= CTL_DEBUG
,
222 .child
= debug_table
,
231 * NOTE: do not add new entries to this table unless you have read
232 * Documentation/sysctl/ctl_unnumbered.txt
237 #ifdef CONFIG_SCHED_DEBUG
238 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
239 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
240 static int min_wakeup_granularity_ns
; /* 0 usecs */
241 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
244 static struct ctl_table kern_table
[] = {
245 #ifdef CONFIG_SCHED_DEBUG
247 .ctl_name
= CTL_UNNUMBERED
,
248 .procname
= "sched_min_granularity_ns",
249 .data
= &sysctl_sched_min_granularity
,
250 .maxlen
= sizeof(unsigned int),
252 .proc_handler
= &sched_nr_latency_handler
,
253 .strategy
= &sysctl_intvec
,
254 .extra1
= &min_sched_granularity_ns
,
255 .extra2
= &max_sched_granularity_ns
,
258 .ctl_name
= CTL_UNNUMBERED
,
259 .procname
= "sched_latency_ns",
260 .data
= &sysctl_sched_latency
,
261 .maxlen
= sizeof(unsigned int),
263 .proc_handler
= &sched_nr_latency_handler
,
264 .strategy
= &sysctl_intvec
,
265 .extra1
= &min_sched_granularity_ns
,
266 .extra2
= &max_sched_granularity_ns
,
269 .ctl_name
= CTL_UNNUMBERED
,
270 .procname
= "sched_wakeup_granularity_ns",
271 .data
= &sysctl_sched_wakeup_granularity
,
272 .maxlen
= sizeof(unsigned int),
274 .proc_handler
= &proc_dointvec_minmax
,
275 .strategy
= &sysctl_intvec
,
276 .extra1
= &min_wakeup_granularity_ns
,
277 .extra2
= &max_wakeup_granularity_ns
,
280 .ctl_name
= CTL_UNNUMBERED
,
281 .procname
= "sched_shares_ratelimit",
282 .data
= &sysctl_sched_shares_ratelimit
,
283 .maxlen
= sizeof(unsigned int),
285 .proc_handler
= &proc_dointvec
,
288 .ctl_name
= CTL_UNNUMBERED
,
289 .procname
= "sched_shares_thresh",
290 .data
= &sysctl_sched_shares_thresh
,
291 .maxlen
= sizeof(unsigned int),
293 .proc_handler
= &proc_dointvec_minmax
,
294 .strategy
= &sysctl_intvec
,
298 .ctl_name
= CTL_UNNUMBERED
,
299 .procname
= "sched_child_runs_first",
300 .data
= &sysctl_sched_child_runs_first
,
301 .maxlen
= sizeof(unsigned int),
303 .proc_handler
= &proc_dointvec
,
306 .ctl_name
= CTL_UNNUMBERED
,
307 .procname
= "sched_features",
308 .data
= &sysctl_sched_features
,
309 .maxlen
= sizeof(unsigned int),
311 .proc_handler
= &proc_dointvec
,
314 .ctl_name
= CTL_UNNUMBERED
,
315 .procname
= "sched_migration_cost",
316 .data
= &sysctl_sched_migration_cost
,
317 .maxlen
= sizeof(unsigned int),
319 .proc_handler
= &proc_dointvec
,
322 .ctl_name
= CTL_UNNUMBERED
,
323 .procname
= "sched_nr_migrate",
324 .data
= &sysctl_sched_nr_migrate
,
325 .maxlen
= sizeof(unsigned int),
327 .proc_handler
= &proc_dointvec
,
331 .ctl_name
= CTL_UNNUMBERED
,
332 .procname
= "sched_rt_period_us",
333 .data
= &sysctl_sched_rt_period
,
334 .maxlen
= sizeof(unsigned int),
336 .proc_handler
= &sched_rt_handler
,
339 .ctl_name
= CTL_UNNUMBERED
,
340 .procname
= "sched_rt_runtime_us",
341 .data
= &sysctl_sched_rt_runtime
,
342 .maxlen
= sizeof(int),
344 .proc_handler
= &sched_rt_handler
,
347 .ctl_name
= CTL_UNNUMBERED
,
348 .procname
= "sched_compat_yield",
349 .data
= &sysctl_sched_compat_yield
,
350 .maxlen
= sizeof(unsigned int),
352 .proc_handler
= &proc_dointvec
,
354 #ifdef CONFIG_PROVE_LOCKING
356 .ctl_name
= CTL_UNNUMBERED
,
357 .procname
= "prove_locking",
358 .data
= &prove_locking
,
359 .maxlen
= sizeof(int),
361 .proc_handler
= &proc_dointvec
,
364 #ifdef CONFIG_LOCK_STAT
366 .ctl_name
= CTL_UNNUMBERED
,
367 .procname
= "lock_stat",
369 .maxlen
= sizeof(int),
371 .proc_handler
= &proc_dointvec
,
375 .ctl_name
= KERN_PANIC
,
377 .data
= &panic_timeout
,
378 .maxlen
= sizeof(int),
380 .proc_handler
= &proc_dointvec
,
383 .ctl_name
= KERN_CORE_USES_PID
,
384 .procname
= "core_uses_pid",
385 .data
= &core_uses_pid
,
386 .maxlen
= sizeof(int),
388 .proc_handler
= &proc_dointvec
,
391 .ctl_name
= KERN_CORE_PATTERN
,
392 .procname
= "core_pattern",
393 .data
= core_pattern
,
394 .maxlen
= CORENAME_MAX_SIZE
,
396 .proc_handler
= &proc_dostring
,
397 .strategy
= &sysctl_string
,
399 #ifdef CONFIG_PROC_SYSCTL
401 .procname
= "tainted",
402 .maxlen
= sizeof(long),
404 .proc_handler
= &proc_taint
,
407 #ifdef CONFIG_LATENCYTOP
409 .procname
= "latencytop",
410 .data
= &latencytop_enabled
,
411 .maxlen
= sizeof(int),
413 .proc_handler
= &proc_dointvec
,
416 #ifdef CONFIG_BLK_DEV_INITRD
418 .ctl_name
= KERN_REALROOTDEV
,
419 .procname
= "real-root-dev",
420 .data
= &real_root_dev
,
421 .maxlen
= sizeof(int),
423 .proc_handler
= &proc_dointvec
,
427 .ctl_name
= CTL_UNNUMBERED
,
428 .procname
= "print-fatal-signals",
429 .data
= &print_fatal_signals
,
430 .maxlen
= sizeof(int),
432 .proc_handler
= &proc_dointvec
,
436 .ctl_name
= KERN_SPARC_REBOOT
,
437 .procname
= "reboot-cmd",
438 .data
= reboot_command
,
441 .proc_handler
= &proc_dostring
,
442 .strategy
= &sysctl_string
,
445 .ctl_name
= KERN_SPARC_STOP_A
,
446 .procname
= "stop-a",
447 .data
= &stop_a_enabled
,
448 .maxlen
= sizeof (int),
450 .proc_handler
= &proc_dointvec
,
453 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
454 .procname
= "scons-poweroff",
455 .data
= &scons_pwroff
,
456 .maxlen
= sizeof (int),
458 .proc_handler
= &proc_dointvec
,
461 #ifdef CONFIG_SPARC64
463 .ctl_name
= CTL_UNNUMBERED
,
464 .procname
= "tsb-ratio",
465 .data
= &sysctl_tsb_ratio
,
466 .maxlen
= sizeof (int),
468 .proc_handler
= &proc_dointvec
,
473 .ctl_name
= KERN_HPPA_PWRSW
,
474 .procname
= "soft-power",
475 .data
= &pwrsw_enabled
,
476 .maxlen
= sizeof (int),
478 .proc_handler
= &proc_dointvec
,
481 .ctl_name
= KERN_HPPA_UNALIGNED
,
482 .procname
= "unaligned-trap",
483 .data
= &unaligned_enabled
,
484 .maxlen
= sizeof (int),
486 .proc_handler
= &proc_dointvec
,
490 .ctl_name
= KERN_CTLALTDEL
,
491 .procname
= "ctrl-alt-del",
493 .maxlen
= sizeof(int),
495 .proc_handler
= &proc_dointvec
,
497 #ifdef CONFIG_FUNCTION_TRACER
499 .ctl_name
= CTL_UNNUMBERED
,
500 .procname
= "ftrace_enabled",
501 .data
= &ftrace_enabled
,
502 .maxlen
= sizeof(int),
504 .proc_handler
= &ftrace_enable_sysctl
,
507 #ifdef CONFIG_STACK_TRACER
509 .ctl_name
= CTL_UNNUMBERED
,
510 .procname
= "stack_tracer_enabled",
511 .data
= &stack_tracer_enabled
,
512 .maxlen
= sizeof(int),
514 .proc_handler
= &stack_trace_sysctl
,
517 #ifdef CONFIG_TRACING
519 .ctl_name
= CTL_UNNUMBERED
,
520 .procname
= "ftrace_dump_on_oops",
521 .data
= &ftrace_dump_on_oops
,
522 .maxlen
= sizeof(int),
524 .proc_handler
= &proc_dointvec
,
527 #ifdef CONFIG_MODULES
529 .ctl_name
= KERN_MODPROBE
,
530 .procname
= "modprobe",
531 .data
= &modprobe_path
,
532 .maxlen
= KMOD_PATH_LEN
,
534 .proc_handler
= &proc_dostring
,
535 .strategy
= &sysctl_string
,
538 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
540 .ctl_name
= KERN_HOTPLUG
,
541 .procname
= "hotplug",
542 .data
= &uevent_helper
,
543 .maxlen
= UEVENT_HELPER_PATH_LEN
,
545 .proc_handler
= &proc_dostring
,
546 .strategy
= &sysctl_string
,
549 #ifdef CONFIG_CHR_DEV_SG
551 .ctl_name
= KERN_SG_BIG_BUFF
,
552 .procname
= "sg-big-buff",
553 .data
= &sg_big_buff
,
554 .maxlen
= sizeof (int),
556 .proc_handler
= &proc_dointvec
,
559 #ifdef CONFIG_BSD_PROCESS_ACCT
561 .ctl_name
= KERN_ACCT
,
564 .maxlen
= 3*sizeof(int),
566 .proc_handler
= &proc_dointvec
,
569 #ifdef CONFIG_MAGIC_SYSRQ
571 .ctl_name
= KERN_SYSRQ
,
573 .data
= &__sysrq_enabled
,
574 .maxlen
= sizeof (int),
576 .proc_handler
= &proc_dointvec
,
579 #ifdef CONFIG_PROC_SYSCTL
581 .procname
= "cad_pid",
583 .maxlen
= sizeof (int),
585 .proc_handler
= &proc_do_cad_pid
,
589 .ctl_name
= KERN_MAX_THREADS
,
590 .procname
= "threads-max",
591 .data
= &max_threads
,
592 .maxlen
= sizeof(int),
594 .proc_handler
= &proc_dointvec
,
597 .ctl_name
= KERN_RANDOM
,
598 .procname
= "random",
600 .child
= random_table
,
603 .ctl_name
= KERN_OVERFLOWUID
,
604 .procname
= "overflowuid",
605 .data
= &overflowuid
,
606 .maxlen
= sizeof(int),
608 .proc_handler
= &proc_dointvec_minmax
,
609 .strategy
= &sysctl_intvec
,
610 .extra1
= &minolduid
,
611 .extra2
= &maxolduid
,
614 .ctl_name
= KERN_OVERFLOWGID
,
615 .procname
= "overflowgid",
616 .data
= &overflowgid
,
617 .maxlen
= sizeof(int),
619 .proc_handler
= &proc_dointvec_minmax
,
620 .strategy
= &sysctl_intvec
,
621 .extra1
= &minolduid
,
622 .extra2
= &maxolduid
,
625 #ifdef CONFIG_MATHEMU
627 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
628 .procname
= "ieee_emulation_warnings",
629 .data
= &sysctl_ieee_emulation_warnings
,
630 .maxlen
= sizeof(int),
632 .proc_handler
= &proc_dointvec
,
636 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
637 .procname
= "userprocess_debug",
638 .data
= &sysctl_userprocess_debug
,
639 .maxlen
= sizeof(int),
641 .proc_handler
= &proc_dointvec
,
645 .ctl_name
= KERN_PIDMAX
,
646 .procname
= "pid_max",
648 .maxlen
= sizeof (int),
650 .proc_handler
= &proc_dointvec_minmax
,
651 .strategy
= sysctl_intvec
,
652 .extra1
= &pid_max_min
,
653 .extra2
= &pid_max_max
,
656 .ctl_name
= KERN_PANIC_ON_OOPS
,
657 .procname
= "panic_on_oops",
658 .data
= &panic_on_oops
,
659 .maxlen
= sizeof(int),
661 .proc_handler
= &proc_dointvec
,
663 #if defined CONFIG_PRINTK
665 .ctl_name
= KERN_PRINTK
,
666 .procname
= "printk",
667 .data
= &console_loglevel
,
668 .maxlen
= 4*sizeof(int),
670 .proc_handler
= &proc_dointvec
,
673 .ctl_name
= KERN_PRINTK_RATELIMIT
,
674 .procname
= "printk_ratelimit",
675 .data
= &printk_ratelimit_state
.interval
,
676 .maxlen
= sizeof(int),
678 .proc_handler
= &proc_dointvec_jiffies
,
679 .strategy
= &sysctl_jiffies
,
682 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
683 .procname
= "printk_ratelimit_burst",
684 .data
= &printk_ratelimit_state
.burst
,
685 .maxlen
= sizeof(int),
687 .proc_handler
= &proc_dointvec
,
691 .ctl_name
= KERN_NGROUPS_MAX
,
692 .procname
= "ngroups_max",
693 .data
= &ngroups_max
,
694 .maxlen
= sizeof (int),
696 .proc_handler
= &proc_dointvec
,
698 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
700 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
701 .procname
= "unknown_nmi_panic",
702 .data
= &unknown_nmi_panic
,
703 .maxlen
= sizeof (int),
705 .proc_handler
= &proc_dointvec
,
708 .procname
= "nmi_watchdog",
709 .data
= &nmi_watchdog_enabled
,
710 .maxlen
= sizeof (int),
712 .proc_handler
= &proc_nmi_enabled
,
715 #if defined(CONFIG_X86)
717 .ctl_name
= KERN_PANIC_ON_NMI
,
718 .procname
= "panic_on_unrecovered_nmi",
719 .data
= &panic_on_unrecovered_nmi
,
720 .maxlen
= sizeof(int),
722 .proc_handler
= &proc_dointvec
,
725 .ctl_name
= KERN_BOOTLOADER_TYPE
,
726 .procname
= "bootloader_type",
727 .data
= &bootloader_type
,
728 .maxlen
= sizeof (int),
730 .proc_handler
= &proc_dointvec
,
733 .ctl_name
= CTL_UNNUMBERED
,
734 .procname
= "bootloader_version",
735 .data
= &bootloader_version
,
736 .maxlen
= sizeof (int),
738 .proc_handler
= &proc_dointvec
,
741 .ctl_name
= CTL_UNNUMBERED
,
742 .procname
= "kstack_depth_to_print",
743 .data
= &kstack_depth_to_print
,
744 .maxlen
= sizeof(int),
746 .proc_handler
= &proc_dointvec
,
749 .ctl_name
= CTL_UNNUMBERED
,
750 .procname
= "io_delay_type",
751 .data
= &io_delay_type
,
752 .maxlen
= sizeof(int),
754 .proc_handler
= &proc_dointvec
,
757 #if defined(CONFIG_MMU)
759 .ctl_name
= KERN_RANDOMIZE
,
760 .procname
= "randomize_va_space",
761 .data
= &randomize_va_space
,
762 .maxlen
= sizeof(int),
764 .proc_handler
= &proc_dointvec
,
767 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
769 .ctl_name
= KERN_SPIN_RETRY
,
770 .procname
= "spin_retry",
772 .maxlen
= sizeof (int),
774 .proc_handler
= &proc_dointvec
,
777 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
779 .procname
= "acpi_video_flags",
780 .data
= &acpi_realmode_flags
,
781 .maxlen
= sizeof (unsigned long),
783 .proc_handler
= &proc_doulongvec_minmax
,
788 .ctl_name
= KERN_IA64_UNALIGNED
,
789 .procname
= "ignore-unaligned-usertrap",
790 .data
= &no_unaligned_warning
,
791 .maxlen
= sizeof (int),
793 .proc_handler
= &proc_dointvec
,
796 .ctl_name
= CTL_UNNUMBERED
,
797 .procname
= "unaligned-dump-stack",
798 .data
= &unaligned_dump_stack
,
799 .maxlen
= sizeof (int),
801 .proc_handler
= &proc_dointvec
,
804 #ifdef CONFIG_DETECT_SOFTLOCKUP
806 .ctl_name
= CTL_UNNUMBERED
,
807 .procname
= "softlockup_panic",
808 .data
= &softlockup_panic
,
809 .maxlen
= sizeof(int),
811 .proc_handler
= &proc_dointvec_minmax
,
812 .strategy
= &sysctl_intvec
,
817 .ctl_name
= CTL_UNNUMBERED
,
818 .procname
= "softlockup_thresh",
819 .data
= &softlockup_thresh
,
820 .maxlen
= sizeof(int),
822 .proc_handler
= &proc_dosoftlockup_thresh
,
823 .strategy
= &sysctl_intvec
,
828 #ifdef CONFIG_DETECT_HUNG_TASK
830 .ctl_name
= CTL_UNNUMBERED
,
831 .procname
= "hung_task_panic",
832 .data
= &sysctl_hung_task_panic
,
833 .maxlen
= sizeof(int),
835 .proc_handler
= &proc_dointvec_minmax
,
836 .strategy
= &sysctl_intvec
,
841 .ctl_name
= CTL_UNNUMBERED
,
842 .procname
= "hung_task_check_count",
843 .data
= &sysctl_hung_task_check_count
,
844 .maxlen
= sizeof(unsigned long),
846 .proc_handler
= &proc_doulongvec_minmax
,
847 .strategy
= &sysctl_intvec
,
850 .ctl_name
= CTL_UNNUMBERED
,
851 .procname
= "hung_task_timeout_secs",
852 .data
= &sysctl_hung_task_timeout_secs
,
853 .maxlen
= sizeof(unsigned long),
855 .proc_handler
= &proc_dohung_task_timeout_secs
,
856 .strategy
= &sysctl_intvec
,
859 .ctl_name
= CTL_UNNUMBERED
,
860 .procname
= "hung_task_warnings",
861 .data
= &sysctl_hung_task_warnings
,
862 .maxlen
= sizeof(unsigned long),
864 .proc_handler
= &proc_doulongvec_minmax
,
865 .strategy
= &sysctl_intvec
,
870 .ctl_name
= KERN_COMPAT_LOG
,
871 .procname
= "compat-log",
873 .maxlen
= sizeof (int),
875 .proc_handler
= &proc_dointvec
,
878 #ifdef CONFIG_RT_MUTEXES
880 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
881 .procname
= "max_lock_depth",
882 .data
= &max_lock_depth
,
883 .maxlen
= sizeof(int),
885 .proc_handler
= &proc_dointvec
,
889 .ctl_name
= CTL_UNNUMBERED
,
890 .procname
= "poweroff_cmd",
891 .data
= &poweroff_cmd
,
892 .maxlen
= POWEROFF_CMD_PATH_LEN
,
894 .proc_handler
= &proc_dostring
,
895 .strategy
= &sysctl_string
,
899 .ctl_name
= CTL_UNNUMBERED
,
902 .child
= key_sysctls
,
905 #ifdef CONFIG_RCU_TORTURE_TEST
907 .ctl_name
= CTL_UNNUMBERED
,
908 .procname
= "rcutorture_runnable",
909 .data
= &rcutorture_runnable
,
910 .maxlen
= sizeof(int),
912 .proc_handler
= &proc_dointvec
,
915 #ifdef CONFIG_SLOW_WORK
917 .ctl_name
= CTL_UNNUMBERED
,
918 .procname
= "slow-work",
920 .child
= slow_work_sysctls
,
924 * NOTE: do not add new entries to this table unless you have read
925 * Documentation/sysctl/ctl_unnumbered.txt
930 static struct ctl_table vm_table
[] = {
932 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
933 .procname
= "overcommit_memory",
934 .data
= &sysctl_overcommit_memory
,
935 .maxlen
= sizeof(sysctl_overcommit_memory
),
937 .proc_handler
= &proc_dointvec
,
940 .ctl_name
= VM_PANIC_ON_OOM
,
941 .procname
= "panic_on_oom",
942 .data
= &sysctl_panic_on_oom
,
943 .maxlen
= sizeof(sysctl_panic_on_oom
),
945 .proc_handler
= &proc_dointvec
,
948 .ctl_name
= CTL_UNNUMBERED
,
949 .procname
= "oom_kill_allocating_task",
950 .data
= &sysctl_oom_kill_allocating_task
,
951 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
953 .proc_handler
= &proc_dointvec
,
956 .ctl_name
= CTL_UNNUMBERED
,
957 .procname
= "oom_dump_tasks",
958 .data
= &sysctl_oom_dump_tasks
,
959 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
961 .proc_handler
= &proc_dointvec
,
964 .ctl_name
= VM_OVERCOMMIT_RATIO
,
965 .procname
= "overcommit_ratio",
966 .data
= &sysctl_overcommit_ratio
,
967 .maxlen
= sizeof(sysctl_overcommit_ratio
),
969 .proc_handler
= &proc_dointvec
,
972 .ctl_name
= VM_PAGE_CLUSTER
,
973 .procname
= "page-cluster",
974 .data
= &page_cluster
,
975 .maxlen
= sizeof(int),
977 .proc_handler
= &proc_dointvec
,
980 .ctl_name
= VM_DIRTY_BACKGROUND
,
981 .procname
= "dirty_background_ratio",
982 .data
= &dirty_background_ratio
,
983 .maxlen
= sizeof(dirty_background_ratio
),
985 .proc_handler
= &dirty_background_ratio_handler
,
986 .strategy
= &sysctl_intvec
,
988 .extra2
= &one_hundred
,
991 .ctl_name
= CTL_UNNUMBERED
,
992 .procname
= "dirty_background_bytes",
993 .data
= &dirty_background_bytes
,
994 .maxlen
= sizeof(dirty_background_bytes
),
996 .proc_handler
= &dirty_background_bytes_handler
,
997 .strategy
= &sysctl_intvec
,
1001 .ctl_name
= VM_DIRTY_RATIO
,
1002 .procname
= "dirty_ratio",
1003 .data
= &vm_dirty_ratio
,
1004 .maxlen
= sizeof(vm_dirty_ratio
),
1006 .proc_handler
= &dirty_ratio_handler
,
1007 .strategy
= &sysctl_intvec
,
1009 .extra2
= &one_hundred
,
1012 .ctl_name
= CTL_UNNUMBERED
,
1013 .procname
= "dirty_bytes",
1014 .data
= &vm_dirty_bytes
,
1015 .maxlen
= sizeof(vm_dirty_bytes
),
1017 .proc_handler
= &dirty_bytes_handler
,
1018 .strategy
= &sysctl_intvec
,
1019 .extra1
= &dirty_bytes_min
,
1022 .procname
= "dirty_writeback_centisecs",
1023 .data
= &dirty_writeback_interval
,
1024 .maxlen
= sizeof(dirty_writeback_interval
),
1026 .proc_handler
= &dirty_writeback_centisecs_handler
,
1029 .procname
= "dirty_expire_centisecs",
1030 .data
= &dirty_expire_interval
,
1031 .maxlen
= sizeof(dirty_expire_interval
),
1033 .proc_handler
= &proc_dointvec
,
1036 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
1037 .procname
= "nr_pdflush_threads",
1038 .data
= &nr_pdflush_threads
,
1039 .maxlen
= sizeof nr_pdflush_threads
,
1040 .mode
= 0444 /* read-only*/,
1041 .proc_handler
= &proc_dointvec
,
1044 .ctl_name
= VM_SWAPPINESS
,
1045 .procname
= "swappiness",
1046 .data
= &vm_swappiness
,
1047 .maxlen
= sizeof(vm_swappiness
),
1049 .proc_handler
= &proc_dointvec_minmax
,
1050 .strategy
= &sysctl_intvec
,
1052 .extra2
= &one_hundred
,
1054 #ifdef CONFIG_HUGETLB_PAGE
1056 .procname
= "nr_hugepages",
1058 .maxlen
= sizeof(unsigned long),
1060 .proc_handler
= &hugetlb_sysctl_handler
,
1061 .extra1
= (void *)&hugetlb_zero
,
1062 .extra2
= (void *)&hugetlb_infinity
,
1065 .ctl_name
= VM_HUGETLB_GROUP
,
1066 .procname
= "hugetlb_shm_group",
1067 .data
= &sysctl_hugetlb_shm_group
,
1068 .maxlen
= sizeof(gid_t
),
1070 .proc_handler
= &proc_dointvec
,
1073 .ctl_name
= CTL_UNNUMBERED
,
1074 .procname
= "hugepages_treat_as_movable",
1075 .data
= &hugepages_treat_as_movable
,
1076 .maxlen
= sizeof(int),
1078 .proc_handler
= &hugetlb_treat_movable_handler
,
1081 .ctl_name
= CTL_UNNUMBERED
,
1082 .procname
= "nr_overcommit_hugepages",
1084 .maxlen
= sizeof(unsigned long),
1086 .proc_handler
= &hugetlb_overcommit_handler
,
1087 .extra1
= (void *)&hugetlb_zero
,
1088 .extra2
= (void *)&hugetlb_infinity
,
1092 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
1093 .procname
= "lowmem_reserve_ratio",
1094 .data
= &sysctl_lowmem_reserve_ratio
,
1095 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1097 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
1098 .strategy
= &sysctl_intvec
,
1101 .ctl_name
= VM_DROP_PAGECACHE
,
1102 .procname
= "drop_caches",
1103 .data
= &sysctl_drop_caches
,
1104 .maxlen
= sizeof(int),
1106 .proc_handler
= drop_caches_sysctl_handler
,
1107 .strategy
= &sysctl_intvec
,
1110 .ctl_name
= VM_MIN_FREE_KBYTES
,
1111 .procname
= "min_free_kbytes",
1112 .data
= &min_free_kbytes
,
1113 .maxlen
= sizeof(min_free_kbytes
),
1115 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1116 .strategy
= &sysctl_intvec
,
1120 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1121 .procname
= "percpu_pagelist_fraction",
1122 .data
= &percpu_pagelist_fraction
,
1123 .maxlen
= sizeof(percpu_pagelist_fraction
),
1125 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1126 .strategy
= &sysctl_intvec
,
1127 .extra1
= &min_percpu_pagelist_fract
,
1131 .ctl_name
= VM_MAX_MAP_COUNT
,
1132 .procname
= "max_map_count",
1133 .data
= &sysctl_max_map_count
,
1134 .maxlen
= sizeof(sysctl_max_map_count
),
1136 .proc_handler
= &proc_dointvec
1140 .ctl_name
= CTL_UNNUMBERED
,
1141 .procname
= "nr_trim_pages",
1142 .data
= &sysctl_nr_trim_pages
,
1143 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1145 .proc_handler
= &proc_dointvec_minmax
,
1146 .strategy
= &sysctl_intvec
,
1151 .ctl_name
= VM_LAPTOP_MODE
,
1152 .procname
= "laptop_mode",
1153 .data
= &laptop_mode
,
1154 .maxlen
= sizeof(laptop_mode
),
1156 .proc_handler
= &proc_dointvec_jiffies
,
1157 .strategy
= &sysctl_jiffies
,
1160 .ctl_name
= VM_BLOCK_DUMP
,
1161 .procname
= "block_dump",
1162 .data
= &block_dump
,
1163 .maxlen
= sizeof(block_dump
),
1165 .proc_handler
= &proc_dointvec
,
1166 .strategy
= &sysctl_intvec
,
1170 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1171 .procname
= "vfs_cache_pressure",
1172 .data
= &sysctl_vfs_cache_pressure
,
1173 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1175 .proc_handler
= &proc_dointvec
,
1176 .strategy
= &sysctl_intvec
,
1179 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1181 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1182 .procname
= "legacy_va_layout",
1183 .data
= &sysctl_legacy_va_layout
,
1184 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1186 .proc_handler
= &proc_dointvec
,
1187 .strategy
= &sysctl_intvec
,
1193 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1194 .procname
= "zone_reclaim_mode",
1195 .data
= &zone_reclaim_mode
,
1196 .maxlen
= sizeof(zone_reclaim_mode
),
1198 .proc_handler
= &proc_dointvec
,
1199 .strategy
= &sysctl_intvec
,
1203 .ctl_name
= VM_MIN_UNMAPPED
,
1204 .procname
= "min_unmapped_ratio",
1205 .data
= &sysctl_min_unmapped_ratio
,
1206 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1208 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1209 .strategy
= &sysctl_intvec
,
1211 .extra2
= &one_hundred
,
1214 .ctl_name
= VM_MIN_SLAB
,
1215 .procname
= "min_slab_ratio",
1216 .data
= &sysctl_min_slab_ratio
,
1217 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1219 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1220 .strategy
= &sysctl_intvec
,
1222 .extra2
= &one_hundred
,
1227 .ctl_name
= CTL_UNNUMBERED
,
1228 .procname
= "stat_interval",
1229 .data
= &sysctl_stat_interval
,
1230 .maxlen
= sizeof(sysctl_stat_interval
),
1232 .proc_handler
= &proc_dointvec_jiffies
,
1233 .strategy
= &sysctl_jiffies
,
1236 #ifdef CONFIG_SECURITY
1238 .ctl_name
= CTL_UNNUMBERED
,
1239 .procname
= "mmap_min_addr",
1240 .data
= &mmap_min_addr
,
1241 .maxlen
= sizeof(unsigned long),
1243 .proc_handler
= &proc_doulongvec_minmax
,
1248 .ctl_name
= CTL_UNNUMBERED
,
1249 .procname
= "numa_zonelist_order",
1250 .data
= &numa_zonelist_order
,
1251 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1253 .proc_handler
= &numa_zonelist_order_handler
,
1254 .strategy
= &sysctl_string
,
1257 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1258 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1260 .ctl_name
= VM_VDSO_ENABLED
,
1261 .procname
= "vdso_enabled",
1262 .data
= &vdso_enabled
,
1263 .maxlen
= sizeof(vdso_enabled
),
1265 .proc_handler
= &proc_dointvec
,
1266 .strategy
= &sysctl_intvec
,
1270 #ifdef CONFIG_HIGHMEM
1272 .ctl_name
= CTL_UNNUMBERED
,
1273 .procname
= "highmem_is_dirtyable",
1274 .data
= &vm_highmem_is_dirtyable
,
1275 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1277 .proc_handler
= &proc_dointvec_minmax
,
1278 .strategy
= &sysctl_intvec
,
1283 #ifdef CONFIG_UNEVICTABLE_LRU
1285 .ctl_name
= CTL_UNNUMBERED
,
1286 .procname
= "scan_unevictable_pages",
1287 .data
= &scan_unevictable_pages
,
1288 .maxlen
= sizeof(scan_unevictable_pages
),
1290 .proc_handler
= &scan_unevictable_handler
,
1294 * NOTE: do not add new entries to this table unless you have read
1295 * Documentation/sysctl/ctl_unnumbered.txt
1300 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1301 static struct ctl_table binfmt_misc_table
[] = {
1306 static struct ctl_table fs_table
[] = {
1308 .ctl_name
= FS_NRINODE
,
1309 .procname
= "inode-nr",
1310 .data
= &inodes_stat
,
1311 .maxlen
= 2*sizeof(int),
1313 .proc_handler
= &proc_dointvec
,
1316 .ctl_name
= FS_STATINODE
,
1317 .procname
= "inode-state",
1318 .data
= &inodes_stat
,
1319 .maxlen
= 7*sizeof(int),
1321 .proc_handler
= &proc_dointvec
,
1324 .procname
= "file-nr",
1325 .data
= &files_stat
,
1326 .maxlen
= 3*sizeof(int),
1328 .proc_handler
= &proc_nr_files
,
1331 .ctl_name
= FS_MAXFILE
,
1332 .procname
= "file-max",
1333 .data
= &files_stat
.max_files
,
1334 .maxlen
= sizeof(int),
1336 .proc_handler
= &proc_dointvec
,
1339 .ctl_name
= CTL_UNNUMBERED
,
1340 .procname
= "nr_open",
1341 .data
= &sysctl_nr_open
,
1342 .maxlen
= sizeof(int),
1344 .proc_handler
= &proc_dointvec_minmax
,
1345 .extra1
= &sysctl_nr_open_min
,
1346 .extra2
= &sysctl_nr_open_max
,
1349 .ctl_name
= FS_DENTRY
,
1350 .procname
= "dentry-state",
1351 .data
= &dentry_stat
,
1352 .maxlen
= 6*sizeof(int),
1354 .proc_handler
= &proc_dointvec
,
1357 .ctl_name
= FS_OVERFLOWUID
,
1358 .procname
= "overflowuid",
1359 .data
= &fs_overflowuid
,
1360 .maxlen
= sizeof(int),
1362 .proc_handler
= &proc_dointvec_minmax
,
1363 .strategy
= &sysctl_intvec
,
1364 .extra1
= &minolduid
,
1365 .extra2
= &maxolduid
,
1368 .ctl_name
= FS_OVERFLOWGID
,
1369 .procname
= "overflowgid",
1370 .data
= &fs_overflowgid
,
1371 .maxlen
= sizeof(int),
1373 .proc_handler
= &proc_dointvec_minmax
,
1374 .strategy
= &sysctl_intvec
,
1375 .extra1
= &minolduid
,
1376 .extra2
= &maxolduid
,
1378 #ifdef CONFIG_FILE_LOCKING
1380 .ctl_name
= FS_LEASES
,
1381 .procname
= "leases-enable",
1382 .data
= &leases_enable
,
1383 .maxlen
= sizeof(int),
1385 .proc_handler
= &proc_dointvec
,
1388 #ifdef CONFIG_DNOTIFY
1390 .ctl_name
= FS_DIR_NOTIFY
,
1391 .procname
= "dir-notify-enable",
1392 .data
= &dir_notify_enable
,
1393 .maxlen
= sizeof(int),
1395 .proc_handler
= &proc_dointvec
,
1399 #ifdef CONFIG_FILE_LOCKING
1401 .ctl_name
= FS_LEASE_TIME
,
1402 .procname
= "lease-break-time",
1403 .data
= &lease_break_time
,
1404 .maxlen
= sizeof(int),
1406 .proc_handler
= &proc_dointvec
,
1411 .procname
= "aio-nr",
1413 .maxlen
= sizeof(aio_nr
),
1415 .proc_handler
= &proc_doulongvec_minmax
,
1418 .procname
= "aio-max-nr",
1419 .data
= &aio_max_nr
,
1420 .maxlen
= sizeof(aio_max_nr
),
1422 .proc_handler
= &proc_doulongvec_minmax
,
1424 #endif /* CONFIG_AIO */
1425 #ifdef CONFIG_INOTIFY_USER
1427 .ctl_name
= FS_INOTIFY
,
1428 .procname
= "inotify",
1430 .child
= inotify_table
,
1435 .procname
= "epoll",
1437 .child
= epoll_table
,
1442 .ctl_name
= KERN_SETUID_DUMPABLE
,
1443 .procname
= "suid_dumpable",
1444 .data
= &suid_dumpable
,
1445 .maxlen
= sizeof(int),
1447 .proc_handler
= &proc_dointvec_minmax
,
1448 .strategy
= &sysctl_intvec
,
1452 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1454 .ctl_name
= CTL_UNNUMBERED
,
1455 .procname
= "binfmt_misc",
1457 .child
= binfmt_misc_table
,
1461 * NOTE: do not add new entries to this table unless you have read
1462 * Documentation/sysctl/ctl_unnumbered.txt
1467 static struct ctl_table debug_table
[] = {
1468 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1470 .ctl_name
= CTL_UNNUMBERED
,
1471 .procname
= "exception-trace",
1472 .data
= &show_unhandled_signals
,
1473 .maxlen
= sizeof(int),
1475 .proc_handler
= proc_dointvec
1481 static struct ctl_table dev_table
[] = {
1485 static DEFINE_SPINLOCK(sysctl_lock
);
1487 /* called under sysctl_lock */
1488 static int use_table(struct ctl_table_header
*p
)
1490 if (unlikely(p
->unregistering
))
1496 /* called under sysctl_lock */
1497 static void unuse_table(struct ctl_table_header
*p
)
1500 if (unlikely(p
->unregistering
))
1501 complete(p
->unregistering
);
1504 /* called under sysctl_lock, will reacquire if has to wait */
1505 static void start_unregistering(struct ctl_table_header
*p
)
1508 * if p->used is 0, nobody will ever touch that entry again;
1509 * we'll eliminate all paths to it before dropping sysctl_lock
1511 if (unlikely(p
->used
)) {
1512 struct completion wait
;
1513 init_completion(&wait
);
1514 p
->unregistering
= &wait
;
1515 spin_unlock(&sysctl_lock
);
1516 wait_for_completion(&wait
);
1517 spin_lock(&sysctl_lock
);
1519 /* anything non-NULL; we'll never dereference it */
1520 p
->unregistering
= ERR_PTR(-EINVAL
);
1523 * do not remove from the list until nobody holds it; walking the
1524 * list in do_sysctl() relies on that.
1526 list_del_init(&p
->ctl_entry
);
1529 void sysctl_head_get(struct ctl_table_header
*head
)
1531 spin_lock(&sysctl_lock
);
1533 spin_unlock(&sysctl_lock
);
1536 void sysctl_head_put(struct ctl_table_header
*head
)
1538 spin_lock(&sysctl_lock
);
1541 spin_unlock(&sysctl_lock
);
1544 struct ctl_table_header
*sysctl_head_grab(struct ctl_table_header
*head
)
1548 spin_lock(&sysctl_lock
);
1549 if (!use_table(head
))
1550 head
= ERR_PTR(-ENOENT
);
1551 spin_unlock(&sysctl_lock
);
1555 void sysctl_head_finish(struct ctl_table_header
*head
)
1559 spin_lock(&sysctl_lock
);
1561 spin_unlock(&sysctl_lock
);
1564 static struct ctl_table_set
*
1565 lookup_header_set(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1567 struct ctl_table_set
*set
= &root
->default_set
;
1569 set
= root
->lookup(root
, namespaces
);
1573 static struct list_head
*
1574 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1576 struct ctl_table_set
*set
= lookup_header_set(root
, namespaces
);
1580 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1581 struct ctl_table_header
*prev
)
1583 struct ctl_table_root
*root
;
1584 struct list_head
*header_list
;
1585 struct ctl_table_header
*head
;
1586 struct list_head
*tmp
;
1588 spin_lock(&sysctl_lock
);
1591 tmp
= &prev
->ctl_entry
;
1595 tmp
= &root_table_header
.ctl_entry
;
1597 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1599 if (!use_table(head
))
1601 spin_unlock(&sysctl_lock
);
1606 header_list
= lookup_header_list(root
, namespaces
);
1607 if (tmp
!= header_list
)
1611 root
= list_entry(root
->root_list
.next
,
1612 struct ctl_table_root
, root_list
);
1613 if (root
== &sysctl_table_root
)
1615 header_list
= lookup_header_list(root
, namespaces
);
1616 } while (list_empty(header_list
));
1617 tmp
= header_list
->next
;
1620 spin_unlock(&sysctl_lock
);
1624 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1626 return __sysctl_head_next(current
->nsproxy
, prev
);
1629 void register_sysctl_root(struct ctl_table_root
*root
)
1631 spin_lock(&sysctl_lock
);
1632 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1633 spin_unlock(&sysctl_lock
);
1636 #ifdef CONFIG_SYSCTL_SYSCALL
1637 /* Perform the actual read/write of a sysctl table entry. */
1638 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1639 struct ctl_table
*table
,
1640 void __user
*oldval
, size_t __user
*oldlenp
,
1641 void __user
*newval
, size_t newlen
)
1649 if (sysctl_perm(root
, table
, op
))
1652 if (table
->strategy
) {
1653 rc
= table
->strategy(table
, oldval
, oldlenp
, newval
, newlen
);
1660 /* If there is no strategy routine, or if the strategy returns
1661 * zero, proceed with automatic r/w */
1662 if (table
->data
&& table
->maxlen
) {
1663 rc
= sysctl_data(table
, oldval
, oldlenp
, newval
, newlen
);
1670 static int parse_table(int __user
*name
, int nlen
,
1671 void __user
*oldval
, size_t __user
*oldlenp
,
1672 void __user
*newval
, size_t newlen
,
1673 struct ctl_table_root
*root
,
1674 struct ctl_table
*table
)
1680 if (get_user(n
, name
))
1682 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1683 if (!table
->ctl_name
)
1685 if (n
== table
->ctl_name
) {
1688 if (sysctl_perm(root
, table
, MAY_EXEC
))
1692 table
= table
->child
;
1695 error
= do_sysctl_strategy(root
, table
,
1704 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1705 void __user
*newval
, size_t newlen
)
1707 struct ctl_table_header
*head
;
1708 int error
= -ENOTDIR
;
1710 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1714 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1718 for (head
= sysctl_head_next(NULL
); head
;
1719 head
= sysctl_head_next(head
)) {
1720 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1722 head
->root
, head
->ctl_table
);
1723 if (error
!= -ENOTDIR
) {
1724 sysctl_head_finish(head
);
1731 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
1733 struct __sysctl_args tmp
;
1736 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1739 error
= deprecated_sysctl_warning(&tmp
);
1744 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1745 tmp
.newval
, tmp
.newlen
);
1750 #endif /* CONFIG_SYSCTL_SYSCALL */
1753 * sysctl_perm does NOT grant the superuser all rights automatically, because
1754 * some sysctl variables are readonly even to root.
1757 static int test_perm(int mode
, int op
)
1759 if (!current_euid())
1761 else if (in_egroup_p(0))
1763 if ((op
& ~mode
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
)) == 0)
1768 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1773 error
= security_sysctl(table
, op
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
));
1777 if (root
->permissions
)
1778 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1782 return test_perm(mode
, op
);
1785 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1787 for (; table
->ctl_name
|| table
->procname
; table
++) {
1788 table
->parent
= parent
;
1790 sysctl_set_parent(table
, table
->child
);
1794 static __init
int sysctl_init(void)
1796 sysctl_set_parent(NULL
, root_table
);
1797 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1800 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1806 core_initcall(sysctl_init
);
1808 static struct ctl_table
*is_branch_in(struct ctl_table
*branch
,
1809 struct ctl_table
*table
)
1811 struct ctl_table
*p
;
1812 const char *s
= branch
->procname
;
1814 /* branch should have named subdirectory as its first element */
1815 if (!s
|| !branch
->child
)
1818 /* ... and nothing else */
1819 if (branch
[1].procname
|| branch
[1].ctl_name
)
1822 /* table should contain subdirectory with the same name */
1823 for (p
= table
; p
->procname
|| p
->ctl_name
; p
++) {
1826 if (p
->procname
&& strcmp(p
->procname
, s
) == 0)
1832 /* see if attaching q to p would be an improvement */
1833 static void try_attach(struct ctl_table_header
*p
, struct ctl_table_header
*q
)
1835 struct ctl_table
*to
= p
->ctl_table
, *by
= q
->ctl_table
;
1836 struct ctl_table
*next
;
1838 int not_in_parent
= !p
->attached_by
;
1840 while ((next
= is_branch_in(by
, to
)) != NULL
) {
1841 if (by
== q
->attached_by
)
1843 if (to
== p
->attached_by
)
1849 if (is_better
&& not_in_parent
) {
1850 q
->attached_by
= by
;
1851 q
->attached_to
= to
;
1857 * __register_sysctl_paths - register a sysctl hierarchy
1858 * @root: List of sysctl headers to register on
1859 * @namespaces: Data to compute which lists of sysctl entries are visible
1860 * @path: The path to the directory the sysctl table is in.
1861 * @table: the top-level table structure
1863 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1864 * array. A completely 0 filled entry terminates the table.
1866 * The members of the &struct ctl_table structure are used as follows:
1868 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1869 * must be unique within that level of sysctl
1871 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1872 * enter a sysctl file
1874 * data - a pointer to data for use by proc_handler
1876 * maxlen - the maximum size in bytes of the data
1878 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1880 * child - a pointer to the child sysctl table if this entry is a directory, or
1883 * proc_handler - the text handler routine (described below)
1885 * strategy - the strategy routine (described below)
1887 * de - for internal use by the sysctl routines
1889 * extra1, extra2 - extra pointers usable by the proc handler routines
1891 * Leaf nodes in the sysctl tree will be represented by a single file
1892 * under /proc; non-leaf nodes will be represented by directories.
1894 * sysctl(2) can automatically manage read and write requests through
1895 * the sysctl table. The data and maxlen fields of the ctl_table
1896 * struct enable minimal validation of the values being written to be
1897 * performed, and the mode field allows minimal authentication.
1899 * More sophisticated management can be enabled by the provision of a
1900 * strategy routine with the table entry. This will be called before
1901 * any automatic read or write of the data is performed.
1903 * The strategy routine may return
1905 * < 0 - Error occurred (error is passed to user process)
1907 * 0 - OK - proceed with automatic read or write.
1909 * > 0 - OK - read or write has been done by the strategy routine, so
1910 * return immediately.
1912 * There must be a proc_handler routine for any terminal nodes
1913 * mirrored under /proc/sys (non-terminals are handled by a built-in
1914 * directory handler). Several default handlers are available to
1915 * cover common cases -
1917 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1918 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1919 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1921 * It is the handler's job to read the input buffer from user memory
1922 * and process it. The handler should return 0 on success.
1924 * This routine returns %NULL on a failure to register, and a pointer
1925 * to the table header on success.
1927 struct ctl_table_header
*__register_sysctl_paths(
1928 struct ctl_table_root
*root
,
1929 struct nsproxy
*namespaces
,
1930 const struct ctl_path
*path
, struct ctl_table
*table
)
1932 struct ctl_table_header
*header
;
1933 struct ctl_table
*new, **prevp
;
1934 unsigned int n
, npath
;
1935 struct ctl_table_set
*set
;
1937 /* Count the path components */
1938 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1942 * For each path component, allocate a 2-element ctl_table array.
1943 * The first array element will be filled with the sysctl entry
1944 * for this, the second will be the sentinel (ctl_name == 0).
1946 * We allocate everything in one go so that we don't have to
1947 * worry about freeing additional memory in unregister_sysctl_table.
1949 header
= kzalloc(sizeof(struct ctl_table_header
) +
1950 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1954 new = (struct ctl_table
*) (header
+ 1);
1956 /* Now connect the dots */
1957 prevp
= &header
->ctl_table
;
1958 for (n
= 0; n
< npath
; ++n
, ++path
) {
1959 /* Copy the procname */
1960 new->procname
= path
->procname
;
1961 new->ctl_name
= path
->ctl_name
;
1965 prevp
= &new->child
;
1970 header
->ctl_table_arg
= table
;
1972 INIT_LIST_HEAD(&header
->ctl_entry
);
1974 header
->unregistering
= NULL
;
1975 header
->root
= root
;
1976 sysctl_set_parent(NULL
, header
->ctl_table
);
1978 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1979 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
1984 spin_lock(&sysctl_lock
);
1985 header
->set
= lookup_header_set(root
, namespaces
);
1986 header
->attached_by
= header
->ctl_table
;
1987 header
->attached_to
= root_table
;
1988 header
->parent
= &root_table_header
;
1989 for (set
= header
->set
; set
; set
= set
->parent
) {
1990 struct ctl_table_header
*p
;
1991 list_for_each_entry(p
, &set
->list
, ctl_entry
) {
1992 if (p
->unregistering
)
1994 try_attach(p
, header
);
1997 header
->parent
->count
++;
1998 list_add_tail(&header
->ctl_entry
, &header
->set
->list
);
1999 spin_unlock(&sysctl_lock
);
2005 * register_sysctl_table_path - register a sysctl table hierarchy
2006 * @path: The path to the directory the sysctl table is in.
2007 * @table: the top-level table structure
2009 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2010 * array. A completely 0 filled entry terminates the table.
2012 * See __register_sysctl_paths for more details.
2014 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2015 struct ctl_table
*table
)
2017 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
2022 * register_sysctl_table - register a sysctl table hierarchy
2023 * @table: the top-level table structure
2025 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2026 * array. A completely 0 filled entry terminates the table.
2028 * See register_sysctl_paths for more details.
2030 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
2032 static const struct ctl_path null_path
[] = { {} };
2034 return register_sysctl_paths(null_path
, table
);
2038 * unregister_sysctl_table - unregister a sysctl table hierarchy
2039 * @header: the header returned from register_sysctl_table
2041 * Unregisters the sysctl table and all children. proc entries may not
2042 * actually be removed until they are no longer used by anyone.
2044 void unregister_sysctl_table(struct ctl_table_header
* header
)
2051 spin_lock(&sysctl_lock
);
2052 start_unregistering(header
);
2053 if (!--header
->parent
->count
) {
2055 kfree(header
->parent
);
2057 if (!--header
->count
)
2059 spin_unlock(&sysctl_lock
);
2062 int sysctl_is_seen(struct ctl_table_header
*p
)
2064 struct ctl_table_set
*set
= p
->set
;
2066 spin_lock(&sysctl_lock
);
2067 if (p
->unregistering
)
2069 else if (!set
->is_seen
)
2072 res
= set
->is_seen(set
);
2073 spin_unlock(&sysctl_lock
);
2077 void setup_sysctl_set(struct ctl_table_set
*p
,
2078 struct ctl_table_set
*parent
,
2079 int (*is_seen
)(struct ctl_table_set
*))
2081 INIT_LIST_HEAD(&p
->list
);
2082 p
->parent
= parent
? parent
: &sysctl_table_root
.default_set
;
2083 p
->is_seen
= is_seen
;
2086 #else /* !CONFIG_SYSCTL */
2087 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
2092 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2093 struct ctl_table
*table
)
2098 void unregister_sysctl_table(struct ctl_table_header
* table
)
2102 void setup_sysctl_set(struct ctl_table_set
*p
,
2103 struct ctl_table_set
*parent
,
2104 int (*is_seen
)(struct ctl_table_set
*))
2108 void sysctl_head_put(struct ctl_table_header
*head
)
2112 #endif /* CONFIG_SYSCTL */
2118 #ifdef CONFIG_PROC_SYSCTL
2120 static int _proc_do_string(void* data
, int maxlen
, int write
,
2121 struct file
*filp
, void __user
*buffer
,
2122 size_t *lenp
, loff_t
*ppos
)
2128 if (!data
|| !maxlen
|| !*lenp
) {
2136 while (len
< *lenp
) {
2137 if (get_user(c
, p
++))
2139 if (c
== 0 || c
== '\n')
2145 if(copy_from_user(data
, buffer
, len
))
2147 ((char *) data
)[len
] = 0;
2165 if(copy_to_user(buffer
, data
, len
))
2168 if(put_user('\n', ((char __user
*) buffer
) + len
))
2179 * proc_dostring - read a string sysctl
2180 * @table: the sysctl table
2181 * @write: %TRUE if this is a write to the sysctl file
2182 * @filp: the file structure
2183 * @buffer: the user buffer
2184 * @lenp: the size of the user buffer
2185 * @ppos: file position
2187 * Reads/writes a string from/to the user buffer. If the kernel
2188 * buffer provided is not large enough to hold the string, the
2189 * string is truncated. The copied string is %NULL-terminated.
2190 * If the string is being read by the user process, it is copied
2191 * and a newline '\n' is added. It is truncated if the buffer is
2194 * Returns 0 on success.
2196 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2197 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2199 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
2200 buffer
, lenp
, ppos
);
2204 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
2206 int write
, void *data
)
2209 *valp
= *negp
? -*lvalp
: *lvalp
;
2214 *lvalp
= (unsigned long)-val
;
2217 *lvalp
= (unsigned long)val
;
2223 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2224 int write
, struct file
*filp
, void __user
*buffer
,
2225 size_t *lenp
, loff_t
*ppos
,
2226 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2227 int write
, void *data
),
2230 #define TMPBUFLEN 21
2231 int *i
, vleft
, first
=1, neg
, val
;
2235 char buf
[TMPBUFLEN
], *p
;
2236 char __user
*s
= buffer
;
2238 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
2239 (*ppos
&& !write
)) {
2244 i
= (int *) tbl_data
;
2245 vleft
= table
->maxlen
/ sizeof(*i
);
2249 conv
= do_proc_dointvec_conv
;
2251 for (; left
&& vleft
--; i
++, first
=0) {
2266 if (len
> sizeof(buf
) - 1)
2267 len
= sizeof(buf
) - 1;
2268 if (copy_from_user(buf
, s
, len
))
2272 if (*p
== '-' && left
> 1) {
2276 if (*p
< '0' || *p
> '9')
2279 lval
= simple_strtoul(p
, &p
, 0);
2282 if ((len
< left
) && *p
&& !isspace(*p
))
2289 if (conv(&neg
, &lval
, i
, 1, data
))
2296 if (conv(&neg
, &lval
, i
, 0, data
))
2299 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2303 if(copy_to_user(s
, buf
, len
))
2310 if (!write
&& !first
&& left
) {
2311 if(put_user('\n', s
))
2318 if (get_user(c
, s
++))
2333 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2334 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2335 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2336 int write
, void *data
),
2339 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2340 buffer
, lenp
, ppos
, conv
, data
);
2344 * proc_dointvec - read a vector of integers
2345 * @table: the sysctl table
2346 * @write: %TRUE if this is a write to the sysctl file
2347 * @filp: the file structure
2348 * @buffer: the user buffer
2349 * @lenp: the size of the user buffer
2350 * @ppos: file position
2352 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2353 * values from/to the user buffer, treated as an ASCII string.
2355 * Returns 0 on success.
2357 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2358 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2360 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2365 * Taint values can only be increased
2366 * This means we can safely use a temporary.
2368 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2369 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2372 unsigned long tmptaint
= get_taint();
2375 if (write
&& !capable(CAP_SYS_ADMIN
))
2380 err
= proc_doulongvec_minmax(&t
, write
, filp
, buffer
, lenp
, ppos
);
2386 * Poor man's atomic or. Not worth adding a primitive
2387 * to everyone's atomic.h for this
2390 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2391 if ((tmptaint
>> i
) & 1)
2399 struct do_proc_dointvec_minmax_conv_param
{
2404 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2406 int write
, void *data
)
2408 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2410 int val
= *negp
? -*lvalp
: *lvalp
;
2411 if ((param
->min
&& *param
->min
> val
) ||
2412 (param
->max
&& *param
->max
< val
))
2419 *lvalp
= (unsigned long)-val
;
2422 *lvalp
= (unsigned long)val
;
2429 * proc_dointvec_minmax - read a vector of integers with min/max values
2430 * @table: the sysctl table
2431 * @write: %TRUE if this is a write to the sysctl file
2432 * @filp: the file structure
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438 * values from/to the user buffer, treated as an ASCII string.
2440 * This routine will ensure the values are within the range specified by
2441 * table->extra1 (min) and table->extra2 (max).
2443 * Returns 0 on success.
2445 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2446 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2448 struct do_proc_dointvec_minmax_conv_param param
= {
2449 .min
= (int *) table
->extra1
,
2450 .max
= (int *) table
->extra2
,
2452 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2453 do_proc_dointvec_minmax_conv
, ¶m
);
2456 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2458 void __user
*buffer
,
2459 size_t *lenp
, loff_t
*ppos
,
2460 unsigned long convmul
,
2461 unsigned long convdiv
)
2463 #define TMPBUFLEN 21
2464 unsigned long *i
, *min
, *max
, val
;
2465 int vleft
, first
=1, neg
;
2467 char buf
[TMPBUFLEN
], *p
;
2468 char __user
*s
= buffer
;
2470 if (!data
|| !table
->maxlen
|| !*lenp
||
2471 (*ppos
&& !write
)) {
2476 i
= (unsigned long *) data
;
2477 min
= (unsigned long *) table
->extra1
;
2478 max
= (unsigned long *) table
->extra2
;
2479 vleft
= table
->maxlen
/ sizeof(unsigned long);
2482 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2497 if (len
> TMPBUFLEN
-1)
2499 if (copy_from_user(buf
, s
, len
))
2503 if (*p
== '-' && left
> 1) {
2507 if (*p
< '0' || *p
> '9')
2509 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2511 if ((len
< left
) && *p
&& !isspace(*p
))
2520 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2527 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2531 if(copy_to_user(s
, buf
, len
))
2538 if (!write
&& !first
&& left
) {
2539 if(put_user('\n', s
))
2546 if (get_user(c
, s
++))
2561 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2563 void __user
*buffer
,
2564 size_t *lenp
, loff_t
*ppos
,
2565 unsigned long convmul
,
2566 unsigned long convdiv
)
2568 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2569 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2573 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2574 * @table: the sysctl table
2575 * @write: %TRUE if this is a write to the sysctl file
2576 * @filp: the file structure
2577 * @buffer: the user buffer
2578 * @lenp: the size of the user buffer
2579 * @ppos: file position
2581 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2582 * values from/to the user buffer, treated as an ASCII string.
2584 * This routine will ensure the values are within the range specified by
2585 * table->extra1 (min) and table->extra2 (max).
2587 * Returns 0 on success.
2589 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2590 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2592 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2596 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2597 * @table: the sysctl table
2598 * @write: %TRUE if this is a write to the sysctl file
2599 * @filp: the file structure
2600 * @buffer: the user buffer
2601 * @lenp: the size of the user buffer
2602 * @ppos: file position
2604 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2605 * values from/to the user buffer, treated as an ASCII string. The values
2606 * are treated as milliseconds, and converted to jiffies when they are stored.
2608 * This routine will ensure the values are within the range specified by
2609 * table->extra1 (min) and table->extra2 (max).
2611 * Returns 0 on success.
2613 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2615 void __user
*buffer
,
2616 size_t *lenp
, loff_t
*ppos
)
2618 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2619 lenp
, ppos
, HZ
, 1000l);
2623 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2625 int write
, void *data
)
2628 if (*lvalp
> LONG_MAX
/ HZ
)
2630 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2636 lval
= (unsigned long)-val
;
2639 lval
= (unsigned long)val
;
2646 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2648 int write
, void *data
)
2651 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2653 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2659 lval
= (unsigned long)-val
;
2662 lval
= (unsigned long)val
;
2664 *lvalp
= jiffies_to_clock_t(lval
);
2669 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2671 int write
, void *data
)
2674 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2680 lval
= (unsigned long)-val
;
2683 lval
= (unsigned long)val
;
2685 *lvalp
= jiffies_to_msecs(lval
);
2691 * proc_dointvec_jiffies - read a vector of integers as seconds
2692 * @table: the sysctl table
2693 * @write: %TRUE if this is a write to the sysctl file
2694 * @filp: the file structure
2695 * @buffer: the user buffer
2696 * @lenp: the size of the user buffer
2697 * @ppos: file position
2699 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2700 * values from/to the user buffer, treated as an ASCII string.
2701 * The values read are assumed to be in seconds, and are converted into
2704 * Returns 0 on success.
2706 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2707 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2709 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2710 do_proc_dointvec_jiffies_conv
,NULL
);
2714 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2715 * @table: the sysctl table
2716 * @write: %TRUE if this is a write to the sysctl file
2717 * @filp: the file structure
2718 * @buffer: the user buffer
2719 * @lenp: the size of the user buffer
2720 * @ppos: pointer to the file position
2722 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2723 * values from/to the user buffer, treated as an ASCII string.
2724 * The values read are assumed to be in 1/USER_HZ seconds, and
2725 * are converted into jiffies.
2727 * Returns 0 on success.
2729 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2730 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2732 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2733 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2737 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2738 * @table: the sysctl table
2739 * @write: %TRUE if this is a write to the sysctl file
2740 * @filp: the file structure
2741 * @buffer: the user buffer
2742 * @lenp: the size of the user buffer
2743 * @ppos: file position
2744 * @ppos: the current position in the file
2746 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2747 * values from/to the user buffer, treated as an ASCII string.
2748 * The values read are assumed to be in 1/1000 seconds, and
2749 * are converted into jiffies.
2751 * Returns 0 on success.
2753 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2754 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2756 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2757 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2760 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2761 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2763 struct pid
*new_pid
;
2767 tmp
= pid_vnr(cad_pid
);
2769 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2770 lenp
, ppos
, NULL
, NULL
);
2774 new_pid
= find_get_pid(tmp
);
2778 put_pid(xchg(&cad_pid
, new_pid
));
2782 #else /* CONFIG_PROC_FS */
2784 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2785 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2790 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2791 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2796 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2797 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2802 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2803 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2808 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2809 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2814 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2815 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2820 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2821 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2826 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2828 void __user
*buffer
,
2829 size_t *lenp
, loff_t
*ppos
)
2835 #endif /* CONFIG_PROC_FS */
2838 #ifdef CONFIG_SYSCTL_SYSCALL
2840 * General sysctl support routines
2843 /* The generic sysctl data routine (used if no strategy routine supplied) */
2844 int sysctl_data(struct ctl_table
*table
,
2845 void __user
*oldval
, size_t __user
*oldlenp
,
2846 void __user
*newval
, size_t newlen
)
2850 /* Get out of I don't have a variable */
2851 if (!table
->data
|| !table
->maxlen
)
2854 if (oldval
&& oldlenp
) {
2855 if (get_user(len
, oldlenp
))
2858 if (len
> table
->maxlen
)
2859 len
= table
->maxlen
;
2860 if (copy_to_user(oldval
, table
->data
, len
))
2862 if (put_user(len
, oldlenp
))
2867 if (newval
&& newlen
) {
2868 if (newlen
> table
->maxlen
)
2869 newlen
= table
->maxlen
;
2871 if (copy_from_user(table
->data
, newval
, newlen
))
2877 /* The generic string strategy routine: */
2878 int sysctl_string(struct ctl_table
*table
,
2879 void __user
*oldval
, size_t __user
*oldlenp
,
2880 void __user
*newval
, size_t newlen
)
2882 if (!table
->data
|| !table
->maxlen
)
2885 if (oldval
&& oldlenp
) {
2887 if (get_user(bufsize
, oldlenp
))
2890 size_t len
= strlen(table
->data
), copied
;
2892 /* This shouldn't trigger for a well-formed sysctl */
2893 if (len
> table
->maxlen
)
2894 len
= table
->maxlen
;
2896 /* Copy up to a max of bufsize-1 bytes of the string */
2897 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2899 if (copy_to_user(oldval
, table
->data
, copied
) ||
2900 put_user(0, (char __user
*)(oldval
+ copied
)))
2902 if (put_user(len
, oldlenp
))
2906 if (newval
&& newlen
) {
2907 size_t len
= newlen
;
2908 if (len
> table
->maxlen
)
2909 len
= table
->maxlen
;
2910 if(copy_from_user(table
->data
, newval
, len
))
2912 if (len
== table
->maxlen
)
2914 ((char *) table
->data
)[len
] = 0;
2920 * This function makes sure that all of the integers in the vector
2921 * are between the minimum and maximum values given in the arrays
2922 * table->extra1 and table->extra2, respectively.
2924 int sysctl_intvec(struct ctl_table
*table
,
2925 void __user
*oldval
, size_t __user
*oldlenp
,
2926 void __user
*newval
, size_t newlen
)
2929 if (newval
&& newlen
) {
2930 int __user
*vec
= (int __user
*) newval
;
2931 int *min
= (int *) table
->extra1
;
2932 int *max
= (int *) table
->extra2
;
2936 if (newlen
% sizeof(int) != 0)
2939 if (!table
->extra1
&& !table
->extra2
)
2942 if (newlen
> table
->maxlen
)
2943 newlen
= table
->maxlen
;
2944 length
= newlen
/ sizeof(int);
2946 for (i
= 0; i
< length
; i
++) {
2948 if (get_user(value
, vec
+ i
))
2950 if (min
&& value
< min
[i
])
2952 if (max
&& value
> max
[i
])
2959 /* Strategy function to convert jiffies to seconds */
2960 int sysctl_jiffies(struct ctl_table
*table
,
2961 void __user
*oldval
, size_t __user
*oldlenp
,
2962 void __user
*newval
, size_t newlen
)
2964 if (oldval
&& oldlenp
) {
2967 if (get_user(olen
, oldlenp
))
2972 if (olen
< sizeof(int))
2975 val
= *(int *)(table
->data
) / HZ
;
2976 if (put_user(val
, (int __user
*)oldval
))
2978 if (put_user(sizeof(int), oldlenp
))
2982 if (newval
&& newlen
) {
2984 if (newlen
!= sizeof(int))
2986 if (get_user(new, (int __user
*)newval
))
2988 *(int *)(table
->data
) = new*HZ
;
2993 /* Strategy function to convert jiffies to seconds */
2994 int sysctl_ms_jiffies(struct ctl_table
*table
,
2995 void __user
*oldval
, size_t __user
*oldlenp
,
2996 void __user
*newval
, size_t newlen
)
2998 if (oldval
&& oldlenp
) {
3001 if (get_user(olen
, oldlenp
))
3006 if (olen
< sizeof(int))
3009 val
= jiffies_to_msecs(*(int *)(table
->data
));
3010 if (put_user(val
, (int __user
*)oldval
))
3012 if (put_user(sizeof(int), oldlenp
))
3016 if (newval
&& newlen
) {
3018 if (newlen
!= sizeof(int))
3020 if (get_user(new, (int __user
*)newval
))
3022 *(int *)(table
->data
) = msecs_to_jiffies(new);
3029 #else /* CONFIG_SYSCTL_SYSCALL */
3032 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
3034 struct __sysctl_args tmp
;
3037 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
3040 error
= deprecated_sysctl_warning(&tmp
);
3042 /* If no error reading the parameters then just -ENOSYS ... */
3049 int sysctl_data(struct ctl_table
*table
,
3050 void __user
*oldval
, size_t __user
*oldlenp
,
3051 void __user
*newval
, size_t newlen
)
3056 int sysctl_string(struct ctl_table
*table
,
3057 void __user
*oldval
, size_t __user
*oldlenp
,
3058 void __user
*newval
, size_t newlen
)
3063 int sysctl_intvec(struct ctl_table
*table
,
3064 void __user
*oldval
, size_t __user
*oldlenp
,
3065 void __user
*newval
, size_t newlen
)
3070 int sysctl_jiffies(struct ctl_table
*table
,
3071 void __user
*oldval
, size_t __user
*oldlenp
,
3072 void __user
*newval
, size_t newlen
)
3077 int sysctl_ms_jiffies(struct ctl_table
*table
,
3078 void __user
*oldval
, size_t __user
*oldlenp
,
3079 void __user
*newval
, size_t newlen
)
3084 #endif /* CONFIG_SYSCTL_SYSCALL */
3086 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
3088 static int msg_count
;
3089 int name
[CTL_MAXNAME
];
3092 /* Check args->nlen. */
3093 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
3096 /* Read in the sysctl name for better debug message logging */
3097 for (i
= 0; i
< args
->nlen
; i
++)
3098 if (get_user(name
[i
], args
->name
+ i
))
3101 /* Ignore accesses to kernel.version */
3102 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
3105 if (msg_count
< 5) {
3108 "warning: process `%s' used the deprecated sysctl "
3109 "system call with ", current
->comm
);
3110 for (i
= 0; i
< args
->nlen
; i
++)
3111 printk("%d.", name
[i
]);
3118 * No sense putting this after each symbol definition, twice,
3119 * exception granted :-)
3121 EXPORT_SYMBOL(proc_dointvec
);
3122 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3123 EXPORT_SYMBOL(proc_dointvec_minmax
);
3124 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3125 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3126 EXPORT_SYMBOL(proc_dostring
);
3127 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3128 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3129 EXPORT_SYMBOL(register_sysctl_table
);
3130 EXPORT_SYMBOL(register_sysctl_paths
);
3131 EXPORT_SYMBOL(sysctl_intvec
);
3132 EXPORT_SYMBOL(sysctl_jiffies
);
3133 EXPORT_SYMBOL(sysctl_ms_jiffies
);
3134 EXPORT_SYMBOL(sysctl_string
);
3135 EXPORT_SYMBOL(sysctl_data
);
3136 EXPORT_SYMBOL(unregister_sysctl_table
);