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
= "kstack_depth_to_print",
735 .data
= &kstack_depth_to_print
,
736 .maxlen
= sizeof(int),
738 .proc_handler
= &proc_dointvec
,
741 .ctl_name
= CTL_UNNUMBERED
,
742 .procname
= "io_delay_type",
743 .data
= &io_delay_type
,
744 .maxlen
= sizeof(int),
746 .proc_handler
= &proc_dointvec
,
749 #if defined(CONFIG_MMU)
751 .ctl_name
= KERN_RANDOMIZE
,
752 .procname
= "randomize_va_space",
753 .data
= &randomize_va_space
,
754 .maxlen
= sizeof(int),
756 .proc_handler
= &proc_dointvec
,
759 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
761 .ctl_name
= KERN_SPIN_RETRY
,
762 .procname
= "spin_retry",
764 .maxlen
= sizeof (int),
766 .proc_handler
= &proc_dointvec
,
769 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
771 .procname
= "acpi_video_flags",
772 .data
= &acpi_realmode_flags
,
773 .maxlen
= sizeof (unsigned long),
775 .proc_handler
= &proc_doulongvec_minmax
,
780 .ctl_name
= KERN_IA64_UNALIGNED
,
781 .procname
= "ignore-unaligned-usertrap",
782 .data
= &no_unaligned_warning
,
783 .maxlen
= sizeof (int),
785 .proc_handler
= &proc_dointvec
,
788 .ctl_name
= CTL_UNNUMBERED
,
789 .procname
= "unaligned-dump-stack",
790 .data
= &unaligned_dump_stack
,
791 .maxlen
= sizeof (int),
793 .proc_handler
= &proc_dointvec
,
796 #ifdef CONFIG_DETECT_SOFTLOCKUP
798 .ctl_name
= CTL_UNNUMBERED
,
799 .procname
= "softlockup_panic",
800 .data
= &softlockup_panic
,
801 .maxlen
= sizeof(int),
803 .proc_handler
= &proc_dointvec_minmax
,
804 .strategy
= &sysctl_intvec
,
809 .ctl_name
= CTL_UNNUMBERED
,
810 .procname
= "softlockup_thresh",
811 .data
= &softlockup_thresh
,
812 .maxlen
= sizeof(int),
814 .proc_handler
= &proc_dosoftlockup_thresh
,
815 .strategy
= &sysctl_intvec
,
820 #ifdef CONFIG_DETECT_HUNG_TASK
822 .ctl_name
= CTL_UNNUMBERED
,
823 .procname
= "hung_task_panic",
824 .data
= &sysctl_hung_task_panic
,
825 .maxlen
= sizeof(int),
827 .proc_handler
= &proc_dointvec_minmax
,
828 .strategy
= &sysctl_intvec
,
833 .ctl_name
= CTL_UNNUMBERED
,
834 .procname
= "hung_task_check_count",
835 .data
= &sysctl_hung_task_check_count
,
836 .maxlen
= sizeof(unsigned long),
838 .proc_handler
= &proc_doulongvec_minmax
,
839 .strategy
= &sysctl_intvec
,
842 .ctl_name
= CTL_UNNUMBERED
,
843 .procname
= "hung_task_timeout_secs",
844 .data
= &sysctl_hung_task_timeout_secs
,
845 .maxlen
= sizeof(unsigned long),
847 .proc_handler
= &proc_dohung_task_timeout_secs
,
848 .strategy
= &sysctl_intvec
,
851 .ctl_name
= CTL_UNNUMBERED
,
852 .procname
= "hung_task_warnings",
853 .data
= &sysctl_hung_task_warnings
,
854 .maxlen
= sizeof(unsigned long),
856 .proc_handler
= &proc_doulongvec_minmax
,
857 .strategy
= &sysctl_intvec
,
862 .ctl_name
= KERN_COMPAT_LOG
,
863 .procname
= "compat-log",
865 .maxlen
= sizeof (int),
867 .proc_handler
= &proc_dointvec
,
870 #ifdef CONFIG_RT_MUTEXES
872 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
873 .procname
= "max_lock_depth",
874 .data
= &max_lock_depth
,
875 .maxlen
= sizeof(int),
877 .proc_handler
= &proc_dointvec
,
881 .ctl_name
= CTL_UNNUMBERED
,
882 .procname
= "poweroff_cmd",
883 .data
= &poweroff_cmd
,
884 .maxlen
= POWEROFF_CMD_PATH_LEN
,
886 .proc_handler
= &proc_dostring
,
887 .strategy
= &sysctl_string
,
891 .ctl_name
= CTL_UNNUMBERED
,
894 .child
= key_sysctls
,
897 #ifdef CONFIG_RCU_TORTURE_TEST
899 .ctl_name
= CTL_UNNUMBERED
,
900 .procname
= "rcutorture_runnable",
901 .data
= &rcutorture_runnable
,
902 .maxlen
= sizeof(int),
904 .proc_handler
= &proc_dointvec
,
907 #ifdef CONFIG_SLOW_WORK
909 .ctl_name
= CTL_UNNUMBERED
,
910 .procname
= "slow-work",
912 .child
= slow_work_sysctls
,
916 * NOTE: do not add new entries to this table unless you have read
917 * Documentation/sysctl/ctl_unnumbered.txt
922 static struct ctl_table vm_table
[] = {
924 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
925 .procname
= "overcommit_memory",
926 .data
= &sysctl_overcommit_memory
,
927 .maxlen
= sizeof(sysctl_overcommit_memory
),
929 .proc_handler
= &proc_dointvec
,
932 .ctl_name
= VM_PANIC_ON_OOM
,
933 .procname
= "panic_on_oom",
934 .data
= &sysctl_panic_on_oom
,
935 .maxlen
= sizeof(sysctl_panic_on_oom
),
937 .proc_handler
= &proc_dointvec
,
940 .ctl_name
= CTL_UNNUMBERED
,
941 .procname
= "oom_kill_allocating_task",
942 .data
= &sysctl_oom_kill_allocating_task
,
943 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
945 .proc_handler
= &proc_dointvec
,
948 .ctl_name
= CTL_UNNUMBERED
,
949 .procname
= "oom_dump_tasks",
950 .data
= &sysctl_oom_dump_tasks
,
951 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
953 .proc_handler
= &proc_dointvec
,
956 .ctl_name
= VM_OVERCOMMIT_RATIO
,
957 .procname
= "overcommit_ratio",
958 .data
= &sysctl_overcommit_ratio
,
959 .maxlen
= sizeof(sysctl_overcommit_ratio
),
961 .proc_handler
= &proc_dointvec
,
964 .ctl_name
= VM_PAGE_CLUSTER
,
965 .procname
= "page-cluster",
966 .data
= &page_cluster
,
967 .maxlen
= sizeof(int),
969 .proc_handler
= &proc_dointvec
,
972 .ctl_name
= VM_DIRTY_BACKGROUND
,
973 .procname
= "dirty_background_ratio",
974 .data
= &dirty_background_ratio
,
975 .maxlen
= sizeof(dirty_background_ratio
),
977 .proc_handler
= &dirty_background_ratio_handler
,
978 .strategy
= &sysctl_intvec
,
980 .extra2
= &one_hundred
,
983 .ctl_name
= CTL_UNNUMBERED
,
984 .procname
= "dirty_background_bytes",
985 .data
= &dirty_background_bytes
,
986 .maxlen
= sizeof(dirty_background_bytes
),
988 .proc_handler
= &dirty_background_bytes_handler
,
989 .strategy
= &sysctl_intvec
,
993 .ctl_name
= VM_DIRTY_RATIO
,
994 .procname
= "dirty_ratio",
995 .data
= &vm_dirty_ratio
,
996 .maxlen
= sizeof(vm_dirty_ratio
),
998 .proc_handler
= &dirty_ratio_handler
,
999 .strategy
= &sysctl_intvec
,
1001 .extra2
= &one_hundred
,
1004 .ctl_name
= CTL_UNNUMBERED
,
1005 .procname
= "dirty_bytes",
1006 .data
= &vm_dirty_bytes
,
1007 .maxlen
= sizeof(vm_dirty_bytes
),
1009 .proc_handler
= &dirty_bytes_handler
,
1010 .strategy
= &sysctl_intvec
,
1011 .extra1
= &dirty_bytes_min
,
1014 .procname
= "dirty_writeback_centisecs",
1015 .data
= &dirty_writeback_interval
,
1016 .maxlen
= sizeof(dirty_writeback_interval
),
1018 .proc_handler
= &dirty_writeback_centisecs_handler
,
1021 .procname
= "dirty_expire_centisecs",
1022 .data
= &dirty_expire_interval
,
1023 .maxlen
= sizeof(dirty_expire_interval
),
1025 .proc_handler
= &proc_dointvec
,
1028 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
1029 .procname
= "nr_pdflush_threads",
1030 .data
= &nr_pdflush_threads
,
1031 .maxlen
= sizeof nr_pdflush_threads
,
1032 .mode
= 0444 /* read-only*/,
1033 .proc_handler
= &proc_dointvec
,
1036 .ctl_name
= VM_SWAPPINESS
,
1037 .procname
= "swappiness",
1038 .data
= &vm_swappiness
,
1039 .maxlen
= sizeof(vm_swappiness
),
1041 .proc_handler
= &proc_dointvec_minmax
,
1042 .strategy
= &sysctl_intvec
,
1044 .extra2
= &one_hundred
,
1046 #ifdef CONFIG_HUGETLB_PAGE
1048 .procname
= "nr_hugepages",
1050 .maxlen
= sizeof(unsigned long),
1052 .proc_handler
= &hugetlb_sysctl_handler
,
1053 .extra1
= (void *)&hugetlb_zero
,
1054 .extra2
= (void *)&hugetlb_infinity
,
1057 .ctl_name
= VM_HUGETLB_GROUP
,
1058 .procname
= "hugetlb_shm_group",
1059 .data
= &sysctl_hugetlb_shm_group
,
1060 .maxlen
= sizeof(gid_t
),
1062 .proc_handler
= &proc_dointvec
,
1065 .ctl_name
= CTL_UNNUMBERED
,
1066 .procname
= "hugepages_treat_as_movable",
1067 .data
= &hugepages_treat_as_movable
,
1068 .maxlen
= sizeof(int),
1070 .proc_handler
= &hugetlb_treat_movable_handler
,
1073 .ctl_name
= CTL_UNNUMBERED
,
1074 .procname
= "nr_overcommit_hugepages",
1076 .maxlen
= sizeof(unsigned long),
1078 .proc_handler
= &hugetlb_overcommit_handler
,
1079 .extra1
= (void *)&hugetlb_zero
,
1080 .extra2
= (void *)&hugetlb_infinity
,
1084 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
1085 .procname
= "lowmem_reserve_ratio",
1086 .data
= &sysctl_lowmem_reserve_ratio
,
1087 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1089 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
1090 .strategy
= &sysctl_intvec
,
1093 .ctl_name
= VM_DROP_PAGECACHE
,
1094 .procname
= "drop_caches",
1095 .data
= &sysctl_drop_caches
,
1096 .maxlen
= sizeof(int),
1098 .proc_handler
= drop_caches_sysctl_handler
,
1099 .strategy
= &sysctl_intvec
,
1102 .ctl_name
= VM_MIN_FREE_KBYTES
,
1103 .procname
= "min_free_kbytes",
1104 .data
= &min_free_kbytes
,
1105 .maxlen
= sizeof(min_free_kbytes
),
1107 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1108 .strategy
= &sysctl_intvec
,
1112 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1113 .procname
= "percpu_pagelist_fraction",
1114 .data
= &percpu_pagelist_fraction
,
1115 .maxlen
= sizeof(percpu_pagelist_fraction
),
1117 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1118 .strategy
= &sysctl_intvec
,
1119 .extra1
= &min_percpu_pagelist_fract
,
1123 .ctl_name
= VM_MAX_MAP_COUNT
,
1124 .procname
= "max_map_count",
1125 .data
= &sysctl_max_map_count
,
1126 .maxlen
= sizeof(sysctl_max_map_count
),
1128 .proc_handler
= &proc_dointvec
1132 .ctl_name
= CTL_UNNUMBERED
,
1133 .procname
= "nr_trim_pages",
1134 .data
= &sysctl_nr_trim_pages
,
1135 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1137 .proc_handler
= &proc_dointvec_minmax
,
1138 .strategy
= &sysctl_intvec
,
1143 .ctl_name
= VM_LAPTOP_MODE
,
1144 .procname
= "laptop_mode",
1145 .data
= &laptop_mode
,
1146 .maxlen
= sizeof(laptop_mode
),
1148 .proc_handler
= &proc_dointvec_jiffies
,
1149 .strategy
= &sysctl_jiffies
,
1152 .ctl_name
= VM_BLOCK_DUMP
,
1153 .procname
= "block_dump",
1154 .data
= &block_dump
,
1155 .maxlen
= sizeof(block_dump
),
1157 .proc_handler
= &proc_dointvec
,
1158 .strategy
= &sysctl_intvec
,
1162 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1163 .procname
= "vfs_cache_pressure",
1164 .data
= &sysctl_vfs_cache_pressure
,
1165 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1167 .proc_handler
= &proc_dointvec
,
1168 .strategy
= &sysctl_intvec
,
1171 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1173 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1174 .procname
= "legacy_va_layout",
1175 .data
= &sysctl_legacy_va_layout
,
1176 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1178 .proc_handler
= &proc_dointvec
,
1179 .strategy
= &sysctl_intvec
,
1185 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1186 .procname
= "zone_reclaim_mode",
1187 .data
= &zone_reclaim_mode
,
1188 .maxlen
= sizeof(zone_reclaim_mode
),
1190 .proc_handler
= &proc_dointvec
,
1191 .strategy
= &sysctl_intvec
,
1195 .ctl_name
= VM_MIN_UNMAPPED
,
1196 .procname
= "min_unmapped_ratio",
1197 .data
= &sysctl_min_unmapped_ratio
,
1198 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1200 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1201 .strategy
= &sysctl_intvec
,
1203 .extra2
= &one_hundred
,
1206 .ctl_name
= VM_MIN_SLAB
,
1207 .procname
= "min_slab_ratio",
1208 .data
= &sysctl_min_slab_ratio
,
1209 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1211 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1212 .strategy
= &sysctl_intvec
,
1214 .extra2
= &one_hundred
,
1219 .ctl_name
= CTL_UNNUMBERED
,
1220 .procname
= "stat_interval",
1221 .data
= &sysctl_stat_interval
,
1222 .maxlen
= sizeof(sysctl_stat_interval
),
1224 .proc_handler
= &proc_dointvec_jiffies
,
1225 .strategy
= &sysctl_jiffies
,
1229 .ctl_name
= CTL_UNNUMBERED
,
1230 .procname
= "mmap_min_addr",
1231 .data
= &mmap_min_addr
,
1232 .maxlen
= sizeof(unsigned long),
1234 .proc_handler
= &proc_doulongvec_minmax
,
1238 .ctl_name
= CTL_UNNUMBERED
,
1239 .procname
= "numa_zonelist_order",
1240 .data
= &numa_zonelist_order
,
1241 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1243 .proc_handler
= &numa_zonelist_order_handler
,
1244 .strategy
= &sysctl_string
,
1247 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1248 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1250 .ctl_name
= VM_VDSO_ENABLED
,
1251 .procname
= "vdso_enabled",
1252 .data
= &vdso_enabled
,
1253 .maxlen
= sizeof(vdso_enabled
),
1255 .proc_handler
= &proc_dointvec
,
1256 .strategy
= &sysctl_intvec
,
1260 #ifdef CONFIG_HIGHMEM
1262 .ctl_name
= CTL_UNNUMBERED
,
1263 .procname
= "highmem_is_dirtyable",
1264 .data
= &vm_highmem_is_dirtyable
,
1265 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1267 .proc_handler
= &proc_dointvec_minmax
,
1268 .strategy
= &sysctl_intvec
,
1273 #ifdef CONFIG_UNEVICTABLE_LRU
1275 .ctl_name
= CTL_UNNUMBERED
,
1276 .procname
= "scan_unevictable_pages",
1277 .data
= &scan_unevictable_pages
,
1278 .maxlen
= sizeof(scan_unevictable_pages
),
1280 .proc_handler
= &scan_unevictable_handler
,
1284 * NOTE: do not add new entries to this table unless you have read
1285 * Documentation/sysctl/ctl_unnumbered.txt
1290 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1291 static struct ctl_table binfmt_misc_table
[] = {
1296 static struct ctl_table fs_table
[] = {
1298 .ctl_name
= FS_NRINODE
,
1299 .procname
= "inode-nr",
1300 .data
= &inodes_stat
,
1301 .maxlen
= 2*sizeof(int),
1303 .proc_handler
= &proc_dointvec
,
1306 .ctl_name
= FS_STATINODE
,
1307 .procname
= "inode-state",
1308 .data
= &inodes_stat
,
1309 .maxlen
= 7*sizeof(int),
1311 .proc_handler
= &proc_dointvec
,
1314 .procname
= "file-nr",
1315 .data
= &files_stat
,
1316 .maxlen
= 3*sizeof(int),
1318 .proc_handler
= &proc_nr_files
,
1321 .ctl_name
= FS_MAXFILE
,
1322 .procname
= "file-max",
1323 .data
= &files_stat
.max_files
,
1324 .maxlen
= sizeof(int),
1326 .proc_handler
= &proc_dointvec
,
1329 .ctl_name
= CTL_UNNUMBERED
,
1330 .procname
= "nr_open",
1331 .data
= &sysctl_nr_open
,
1332 .maxlen
= sizeof(int),
1334 .proc_handler
= &proc_dointvec_minmax
,
1335 .extra1
= &sysctl_nr_open_min
,
1336 .extra2
= &sysctl_nr_open_max
,
1339 .ctl_name
= FS_DENTRY
,
1340 .procname
= "dentry-state",
1341 .data
= &dentry_stat
,
1342 .maxlen
= 6*sizeof(int),
1344 .proc_handler
= &proc_dointvec
,
1347 .ctl_name
= FS_OVERFLOWUID
,
1348 .procname
= "overflowuid",
1349 .data
= &fs_overflowuid
,
1350 .maxlen
= sizeof(int),
1352 .proc_handler
= &proc_dointvec_minmax
,
1353 .strategy
= &sysctl_intvec
,
1354 .extra1
= &minolduid
,
1355 .extra2
= &maxolduid
,
1358 .ctl_name
= FS_OVERFLOWGID
,
1359 .procname
= "overflowgid",
1360 .data
= &fs_overflowgid
,
1361 .maxlen
= sizeof(int),
1363 .proc_handler
= &proc_dointvec_minmax
,
1364 .strategy
= &sysctl_intvec
,
1365 .extra1
= &minolduid
,
1366 .extra2
= &maxolduid
,
1368 #ifdef CONFIG_FILE_LOCKING
1370 .ctl_name
= FS_LEASES
,
1371 .procname
= "leases-enable",
1372 .data
= &leases_enable
,
1373 .maxlen
= sizeof(int),
1375 .proc_handler
= &proc_dointvec
,
1378 #ifdef CONFIG_DNOTIFY
1380 .ctl_name
= FS_DIR_NOTIFY
,
1381 .procname
= "dir-notify-enable",
1382 .data
= &dir_notify_enable
,
1383 .maxlen
= sizeof(int),
1385 .proc_handler
= &proc_dointvec
,
1389 #ifdef CONFIG_FILE_LOCKING
1391 .ctl_name
= FS_LEASE_TIME
,
1392 .procname
= "lease-break-time",
1393 .data
= &lease_break_time
,
1394 .maxlen
= sizeof(int),
1396 .proc_handler
= &proc_dointvec
,
1401 .procname
= "aio-nr",
1403 .maxlen
= sizeof(aio_nr
),
1405 .proc_handler
= &proc_doulongvec_minmax
,
1408 .procname
= "aio-max-nr",
1409 .data
= &aio_max_nr
,
1410 .maxlen
= sizeof(aio_max_nr
),
1412 .proc_handler
= &proc_doulongvec_minmax
,
1414 #endif /* CONFIG_AIO */
1415 #ifdef CONFIG_INOTIFY_USER
1417 .ctl_name
= FS_INOTIFY
,
1418 .procname
= "inotify",
1420 .child
= inotify_table
,
1425 .procname
= "epoll",
1427 .child
= epoll_table
,
1432 .ctl_name
= KERN_SETUID_DUMPABLE
,
1433 .procname
= "suid_dumpable",
1434 .data
= &suid_dumpable
,
1435 .maxlen
= sizeof(int),
1437 .proc_handler
= &proc_dointvec_minmax
,
1438 .strategy
= &sysctl_intvec
,
1442 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1444 .ctl_name
= CTL_UNNUMBERED
,
1445 .procname
= "binfmt_misc",
1447 .child
= binfmt_misc_table
,
1451 * NOTE: do not add new entries to this table unless you have read
1452 * Documentation/sysctl/ctl_unnumbered.txt
1457 static struct ctl_table debug_table
[] = {
1458 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1460 .ctl_name
= CTL_UNNUMBERED
,
1461 .procname
= "exception-trace",
1462 .data
= &show_unhandled_signals
,
1463 .maxlen
= sizeof(int),
1465 .proc_handler
= proc_dointvec
1471 static struct ctl_table dev_table
[] = {
1475 static DEFINE_SPINLOCK(sysctl_lock
);
1477 /* called under sysctl_lock */
1478 static int use_table(struct ctl_table_header
*p
)
1480 if (unlikely(p
->unregistering
))
1486 /* called under sysctl_lock */
1487 static void unuse_table(struct ctl_table_header
*p
)
1490 if (unlikely(p
->unregistering
))
1491 complete(p
->unregistering
);
1494 /* called under sysctl_lock, will reacquire if has to wait */
1495 static void start_unregistering(struct ctl_table_header
*p
)
1498 * if p->used is 0, nobody will ever touch that entry again;
1499 * we'll eliminate all paths to it before dropping sysctl_lock
1501 if (unlikely(p
->used
)) {
1502 struct completion wait
;
1503 init_completion(&wait
);
1504 p
->unregistering
= &wait
;
1505 spin_unlock(&sysctl_lock
);
1506 wait_for_completion(&wait
);
1507 spin_lock(&sysctl_lock
);
1509 /* anything non-NULL; we'll never dereference it */
1510 p
->unregistering
= ERR_PTR(-EINVAL
);
1513 * do not remove from the list until nobody holds it; walking the
1514 * list in do_sysctl() relies on that.
1516 list_del_init(&p
->ctl_entry
);
1519 void sysctl_head_get(struct ctl_table_header
*head
)
1521 spin_lock(&sysctl_lock
);
1523 spin_unlock(&sysctl_lock
);
1526 void sysctl_head_put(struct ctl_table_header
*head
)
1528 spin_lock(&sysctl_lock
);
1531 spin_unlock(&sysctl_lock
);
1534 struct ctl_table_header
*sysctl_head_grab(struct ctl_table_header
*head
)
1538 spin_lock(&sysctl_lock
);
1539 if (!use_table(head
))
1540 head
= ERR_PTR(-ENOENT
);
1541 spin_unlock(&sysctl_lock
);
1545 void sysctl_head_finish(struct ctl_table_header
*head
)
1549 spin_lock(&sysctl_lock
);
1551 spin_unlock(&sysctl_lock
);
1554 static struct ctl_table_set
*
1555 lookup_header_set(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1557 struct ctl_table_set
*set
= &root
->default_set
;
1559 set
= root
->lookup(root
, namespaces
);
1563 static struct list_head
*
1564 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1566 struct ctl_table_set
*set
= lookup_header_set(root
, namespaces
);
1570 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1571 struct ctl_table_header
*prev
)
1573 struct ctl_table_root
*root
;
1574 struct list_head
*header_list
;
1575 struct ctl_table_header
*head
;
1576 struct list_head
*tmp
;
1578 spin_lock(&sysctl_lock
);
1581 tmp
= &prev
->ctl_entry
;
1585 tmp
= &root_table_header
.ctl_entry
;
1587 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1589 if (!use_table(head
))
1591 spin_unlock(&sysctl_lock
);
1596 header_list
= lookup_header_list(root
, namespaces
);
1597 if (tmp
!= header_list
)
1601 root
= list_entry(root
->root_list
.next
,
1602 struct ctl_table_root
, root_list
);
1603 if (root
== &sysctl_table_root
)
1605 header_list
= lookup_header_list(root
, namespaces
);
1606 } while (list_empty(header_list
));
1607 tmp
= header_list
->next
;
1610 spin_unlock(&sysctl_lock
);
1614 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1616 return __sysctl_head_next(current
->nsproxy
, prev
);
1619 void register_sysctl_root(struct ctl_table_root
*root
)
1621 spin_lock(&sysctl_lock
);
1622 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1623 spin_unlock(&sysctl_lock
);
1626 #ifdef CONFIG_SYSCTL_SYSCALL
1627 /* Perform the actual read/write of a sysctl table entry. */
1628 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1629 struct ctl_table
*table
,
1630 void __user
*oldval
, size_t __user
*oldlenp
,
1631 void __user
*newval
, size_t newlen
)
1639 if (sysctl_perm(root
, table
, op
))
1642 if (table
->strategy
) {
1643 rc
= table
->strategy(table
, oldval
, oldlenp
, newval
, newlen
);
1650 /* If there is no strategy routine, or if the strategy returns
1651 * zero, proceed with automatic r/w */
1652 if (table
->data
&& table
->maxlen
) {
1653 rc
= sysctl_data(table
, oldval
, oldlenp
, newval
, newlen
);
1660 static int parse_table(int __user
*name
, int nlen
,
1661 void __user
*oldval
, size_t __user
*oldlenp
,
1662 void __user
*newval
, size_t newlen
,
1663 struct ctl_table_root
*root
,
1664 struct ctl_table
*table
)
1670 if (get_user(n
, name
))
1672 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1673 if (!table
->ctl_name
)
1675 if (n
== table
->ctl_name
) {
1678 if (sysctl_perm(root
, table
, MAY_EXEC
))
1682 table
= table
->child
;
1685 error
= do_sysctl_strategy(root
, table
,
1694 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1695 void __user
*newval
, size_t newlen
)
1697 struct ctl_table_header
*head
;
1698 int error
= -ENOTDIR
;
1700 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1704 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1708 for (head
= sysctl_head_next(NULL
); head
;
1709 head
= sysctl_head_next(head
)) {
1710 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1712 head
->root
, head
->ctl_table
);
1713 if (error
!= -ENOTDIR
) {
1714 sysctl_head_finish(head
);
1721 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
1723 struct __sysctl_args tmp
;
1726 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1729 error
= deprecated_sysctl_warning(&tmp
);
1734 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1735 tmp
.newval
, tmp
.newlen
);
1740 #endif /* CONFIG_SYSCTL_SYSCALL */
1743 * sysctl_perm does NOT grant the superuser all rights automatically, because
1744 * some sysctl variables are readonly even to root.
1747 static int test_perm(int mode
, int op
)
1749 if (!current_euid())
1751 else if (in_egroup_p(0))
1753 if ((op
& ~mode
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
)) == 0)
1758 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1763 error
= security_sysctl(table
, op
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
));
1767 if (root
->permissions
)
1768 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1772 return test_perm(mode
, op
);
1775 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1777 for (; table
->ctl_name
|| table
->procname
; table
++) {
1778 table
->parent
= parent
;
1780 sysctl_set_parent(table
, table
->child
);
1784 static __init
int sysctl_init(void)
1786 sysctl_set_parent(NULL
, root_table
);
1787 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1790 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1796 core_initcall(sysctl_init
);
1798 static struct ctl_table
*is_branch_in(struct ctl_table
*branch
,
1799 struct ctl_table
*table
)
1801 struct ctl_table
*p
;
1802 const char *s
= branch
->procname
;
1804 /* branch should have named subdirectory as its first element */
1805 if (!s
|| !branch
->child
)
1808 /* ... and nothing else */
1809 if (branch
[1].procname
|| branch
[1].ctl_name
)
1812 /* table should contain subdirectory with the same name */
1813 for (p
= table
; p
->procname
|| p
->ctl_name
; p
++) {
1816 if (p
->procname
&& strcmp(p
->procname
, s
) == 0)
1822 /* see if attaching q to p would be an improvement */
1823 static void try_attach(struct ctl_table_header
*p
, struct ctl_table_header
*q
)
1825 struct ctl_table
*to
= p
->ctl_table
, *by
= q
->ctl_table
;
1826 struct ctl_table
*next
;
1828 int not_in_parent
= !p
->attached_by
;
1830 while ((next
= is_branch_in(by
, to
)) != NULL
) {
1831 if (by
== q
->attached_by
)
1833 if (to
== p
->attached_by
)
1839 if (is_better
&& not_in_parent
) {
1840 q
->attached_by
= by
;
1841 q
->attached_to
= to
;
1847 * __register_sysctl_paths - register a sysctl hierarchy
1848 * @root: List of sysctl headers to register on
1849 * @namespaces: Data to compute which lists of sysctl entries are visible
1850 * @path: The path to the directory the sysctl table is in.
1851 * @table: the top-level table structure
1853 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1854 * array. A completely 0 filled entry terminates the table.
1856 * The members of the &struct ctl_table structure are used as follows:
1858 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1859 * must be unique within that level of sysctl
1861 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1862 * enter a sysctl file
1864 * data - a pointer to data for use by proc_handler
1866 * maxlen - the maximum size in bytes of the data
1868 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1870 * child - a pointer to the child sysctl table if this entry is a directory, or
1873 * proc_handler - the text handler routine (described below)
1875 * strategy - the strategy routine (described below)
1877 * de - for internal use by the sysctl routines
1879 * extra1, extra2 - extra pointers usable by the proc handler routines
1881 * Leaf nodes in the sysctl tree will be represented by a single file
1882 * under /proc; non-leaf nodes will be represented by directories.
1884 * sysctl(2) can automatically manage read and write requests through
1885 * the sysctl table. The data and maxlen fields of the ctl_table
1886 * struct enable minimal validation of the values being written to be
1887 * performed, and the mode field allows minimal authentication.
1889 * More sophisticated management can be enabled by the provision of a
1890 * strategy routine with the table entry. This will be called before
1891 * any automatic read or write of the data is performed.
1893 * The strategy routine may return
1895 * < 0 - Error occurred (error is passed to user process)
1897 * 0 - OK - proceed with automatic read or write.
1899 * > 0 - OK - read or write has been done by the strategy routine, so
1900 * return immediately.
1902 * There must be a proc_handler routine for any terminal nodes
1903 * mirrored under /proc/sys (non-terminals are handled by a built-in
1904 * directory handler). Several default handlers are available to
1905 * cover common cases -
1907 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1908 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1909 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1911 * It is the handler's job to read the input buffer from user memory
1912 * and process it. The handler should return 0 on success.
1914 * This routine returns %NULL on a failure to register, and a pointer
1915 * to the table header on success.
1917 struct ctl_table_header
*__register_sysctl_paths(
1918 struct ctl_table_root
*root
,
1919 struct nsproxy
*namespaces
,
1920 const struct ctl_path
*path
, struct ctl_table
*table
)
1922 struct ctl_table_header
*header
;
1923 struct ctl_table
*new, **prevp
;
1924 unsigned int n
, npath
;
1925 struct ctl_table_set
*set
;
1927 /* Count the path components */
1928 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1932 * For each path component, allocate a 2-element ctl_table array.
1933 * The first array element will be filled with the sysctl entry
1934 * for this, the second will be the sentinel (ctl_name == 0).
1936 * We allocate everything in one go so that we don't have to
1937 * worry about freeing additional memory in unregister_sysctl_table.
1939 header
= kzalloc(sizeof(struct ctl_table_header
) +
1940 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1944 new = (struct ctl_table
*) (header
+ 1);
1946 /* Now connect the dots */
1947 prevp
= &header
->ctl_table
;
1948 for (n
= 0; n
< npath
; ++n
, ++path
) {
1949 /* Copy the procname */
1950 new->procname
= path
->procname
;
1951 new->ctl_name
= path
->ctl_name
;
1955 prevp
= &new->child
;
1960 header
->ctl_table_arg
= table
;
1962 INIT_LIST_HEAD(&header
->ctl_entry
);
1964 header
->unregistering
= NULL
;
1965 header
->root
= root
;
1966 sysctl_set_parent(NULL
, header
->ctl_table
);
1968 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1969 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
1974 spin_lock(&sysctl_lock
);
1975 header
->set
= lookup_header_set(root
, namespaces
);
1976 header
->attached_by
= header
->ctl_table
;
1977 header
->attached_to
= root_table
;
1978 header
->parent
= &root_table_header
;
1979 for (set
= header
->set
; set
; set
= set
->parent
) {
1980 struct ctl_table_header
*p
;
1981 list_for_each_entry(p
, &set
->list
, ctl_entry
) {
1982 if (p
->unregistering
)
1984 try_attach(p
, header
);
1987 header
->parent
->count
++;
1988 list_add_tail(&header
->ctl_entry
, &header
->set
->list
);
1989 spin_unlock(&sysctl_lock
);
1995 * register_sysctl_table_path - register a sysctl table hierarchy
1996 * @path: The path to the directory the sysctl table is in.
1997 * @table: the top-level table structure
1999 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2000 * array. A completely 0 filled entry terminates the table.
2002 * See __register_sysctl_paths for more details.
2004 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2005 struct ctl_table
*table
)
2007 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
2012 * register_sysctl_table - register a sysctl table hierarchy
2013 * @table: the top-level table structure
2015 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2016 * array. A completely 0 filled entry terminates the table.
2018 * See register_sysctl_paths for more details.
2020 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
2022 static const struct ctl_path null_path
[] = { {} };
2024 return register_sysctl_paths(null_path
, table
);
2028 * unregister_sysctl_table - unregister a sysctl table hierarchy
2029 * @header: the header returned from register_sysctl_table
2031 * Unregisters the sysctl table and all children. proc entries may not
2032 * actually be removed until they are no longer used by anyone.
2034 void unregister_sysctl_table(struct ctl_table_header
* header
)
2041 spin_lock(&sysctl_lock
);
2042 start_unregistering(header
);
2043 if (!--header
->parent
->count
) {
2045 kfree(header
->parent
);
2047 if (!--header
->count
)
2049 spin_unlock(&sysctl_lock
);
2052 int sysctl_is_seen(struct ctl_table_header
*p
)
2054 struct ctl_table_set
*set
= p
->set
;
2056 spin_lock(&sysctl_lock
);
2057 if (p
->unregistering
)
2059 else if (!set
->is_seen
)
2062 res
= set
->is_seen(set
);
2063 spin_unlock(&sysctl_lock
);
2067 void setup_sysctl_set(struct ctl_table_set
*p
,
2068 struct ctl_table_set
*parent
,
2069 int (*is_seen
)(struct ctl_table_set
*))
2071 INIT_LIST_HEAD(&p
->list
);
2072 p
->parent
= parent
? parent
: &sysctl_table_root
.default_set
;
2073 p
->is_seen
= is_seen
;
2076 #else /* !CONFIG_SYSCTL */
2077 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
2082 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2083 struct ctl_table
*table
)
2088 void unregister_sysctl_table(struct ctl_table_header
* table
)
2092 void setup_sysctl_set(struct ctl_table_set
*p
,
2093 struct ctl_table_set
*parent
,
2094 int (*is_seen
)(struct ctl_table_set
*))
2098 void sysctl_head_put(struct ctl_table_header
*head
)
2102 #endif /* CONFIG_SYSCTL */
2108 #ifdef CONFIG_PROC_SYSCTL
2110 static int _proc_do_string(void* data
, int maxlen
, int write
,
2111 struct file
*filp
, void __user
*buffer
,
2112 size_t *lenp
, loff_t
*ppos
)
2118 if (!data
|| !maxlen
|| !*lenp
) {
2126 while (len
< *lenp
) {
2127 if (get_user(c
, p
++))
2129 if (c
== 0 || c
== '\n')
2135 if(copy_from_user(data
, buffer
, len
))
2137 ((char *) data
)[len
] = 0;
2155 if(copy_to_user(buffer
, data
, len
))
2158 if(put_user('\n', ((char __user
*) buffer
) + len
))
2169 * proc_dostring - read a string sysctl
2170 * @table: the sysctl table
2171 * @write: %TRUE if this is a write to the sysctl file
2172 * @filp: the file structure
2173 * @buffer: the user buffer
2174 * @lenp: the size of the user buffer
2175 * @ppos: file position
2177 * Reads/writes a string from/to the user buffer. If the kernel
2178 * buffer provided is not large enough to hold the string, the
2179 * string is truncated. The copied string is %NULL-terminated.
2180 * If the string is being read by the user process, it is copied
2181 * and a newline '\n' is added. It is truncated if the buffer is
2184 * Returns 0 on success.
2186 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2187 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2189 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
2190 buffer
, lenp
, ppos
);
2194 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
2196 int write
, void *data
)
2199 *valp
= *negp
? -*lvalp
: *lvalp
;
2204 *lvalp
= (unsigned long)-val
;
2207 *lvalp
= (unsigned long)val
;
2213 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2214 int write
, struct file
*filp
, void __user
*buffer
,
2215 size_t *lenp
, loff_t
*ppos
,
2216 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2217 int write
, void *data
),
2220 #define TMPBUFLEN 21
2221 int *i
, vleft
, first
=1, neg
, val
;
2225 char buf
[TMPBUFLEN
], *p
;
2226 char __user
*s
= buffer
;
2228 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
2229 (*ppos
&& !write
)) {
2234 i
= (int *) tbl_data
;
2235 vleft
= table
->maxlen
/ sizeof(*i
);
2239 conv
= do_proc_dointvec_conv
;
2241 for (; left
&& vleft
--; i
++, first
=0) {
2256 if (len
> sizeof(buf
) - 1)
2257 len
= sizeof(buf
) - 1;
2258 if (copy_from_user(buf
, s
, len
))
2262 if (*p
== '-' && left
> 1) {
2266 if (*p
< '0' || *p
> '9')
2269 lval
= simple_strtoul(p
, &p
, 0);
2272 if ((len
< left
) && *p
&& !isspace(*p
))
2279 if (conv(&neg
, &lval
, i
, 1, data
))
2286 if (conv(&neg
, &lval
, i
, 0, data
))
2289 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2293 if(copy_to_user(s
, buf
, len
))
2300 if (!write
&& !first
&& left
) {
2301 if(put_user('\n', s
))
2308 if (get_user(c
, s
++))
2323 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2324 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2325 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2326 int write
, void *data
),
2329 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2330 buffer
, lenp
, ppos
, conv
, data
);
2334 * proc_dointvec - read a vector of integers
2335 * @table: the sysctl table
2336 * @write: %TRUE if this is a write to the sysctl file
2337 * @filp: the file structure
2338 * @buffer: the user buffer
2339 * @lenp: the size of the user buffer
2340 * @ppos: file position
2342 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2343 * values from/to the user buffer, treated as an ASCII string.
2345 * Returns 0 on success.
2347 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2348 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2350 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2355 * Taint values can only be increased
2356 * This means we can safely use a temporary.
2358 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2359 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2362 unsigned long tmptaint
= get_taint();
2365 if (write
&& !capable(CAP_SYS_ADMIN
))
2370 err
= proc_doulongvec_minmax(&t
, write
, filp
, buffer
, lenp
, ppos
);
2376 * Poor man's atomic or. Not worth adding a primitive
2377 * to everyone's atomic.h for this
2380 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2381 if ((tmptaint
>> i
) & 1)
2389 struct do_proc_dointvec_minmax_conv_param
{
2394 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2396 int write
, void *data
)
2398 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2400 int val
= *negp
? -*lvalp
: *lvalp
;
2401 if ((param
->min
&& *param
->min
> val
) ||
2402 (param
->max
&& *param
->max
< val
))
2409 *lvalp
= (unsigned long)-val
;
2412 *lvalp
= (unsigned long)val
;
2419 * proc_dointvec_minmax - read a vector of integers with min/max values
2420 * @table: the sysctl table
2421 * @write: %TRUE if this is a write to the sysctl file
2422 * @filp: the file structure
2423 * @buffer: the user buffer
2424 * @lenp: the size of the user buffer
2425 * @ppos: file position
2427 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2428 * values from/to the user buffer, treated as an ASCII string.
2430 * This routine will ensure the values are within the range specified by
2431 * table->extra1 (min) and table->extra2 (max).
2433 * Returns 0 on success.
2435 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2436 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2438 struct do_proc_dointvec_minmax_conv_param param
= {
2439 .min
= (int *) table
->extra1
,
2440 .max
= (int *) table
->extra2
,
2442 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2443 do_proc_dointvec_minmax_conv
, ¶m
);
2446 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2448 void __user
*buffer
,
2449 size_t *lenp
, loff_t
*ppos
,
2450 unsigned long convmul
,
2451 unsigned long convdiv
)
2453 #define TMPBUFLEN 21
2454 unsigned long *i
, *min
, *max
, val
;
2455 int vleft
, first
=1, neg
;
2457 char buf
[TMPBUFLEN
], *p
;
2458 char __user
*s
= buffer
;
2460 if (!data
|| !table
->maxlen
|| !*lenp
||
2461 (*ppos
&& !write
)) {
2466 i
= (unsigned long *) data
;
2467 min
= (unsigned long *) table
->extra1
;
2468 max
= (unsigned long *) table
->extra2
;
2469 vleft
= table
->maxlen
/ sizeof(unsigned long);
2472 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2487 if (len
> TMPBUFLEN
-1)
2489 if (copy_from_user(buf
, s
, len
))
2493 if (*p
== '-' && left
> 1) {
2497 if (*p
< '0' || *p
> '9')
2499 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2501 if ((len
< left
) && *p
&& !isspace(*p
))
2510 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2517 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2521 if(copy_to_user(s
, buf
, len
))
2528 if (!write
&& !first
&& left
) {
2529 if(put_user('\n', s
))
2536 if (get_user(c
, s
++))
2551 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2553 void __user
*buffer
,
2554 size_t *lenp
, loff_t
*ppos
,
2555 unsigned long convmul
,
2556 unsigned long convdiv
)
2558 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2559 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2563 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2564 * @table: the sysctl table
2565 * @write: %TRUE if this is a write to the sysctl file
2566 * @filp: the file structure
2567 * @buffer: the user buffer
2568 * @lenp: the size of the user buffer
2569 * @ppos: file position
2571 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2572 * values from/to the user buffer, treated as an ASCII string.
2574 * This routine will ensure the values are within the range specified by
2575 * table->extra1 (min) and table->extra2 (max).
2577 * Returns 0 on success.
2579 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2580 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2582 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2586 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2587 * @table: the sysctl table
2588 * @write: %TRUE if this is a write to the sysctl file
2589 * @filp: the file structure
2590 * @buffer: the user buffer
2591 * @lenp: the size of the user buffer
2592 * @ppos: file position
2594 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2595 * values from/to the user buffer, treated as an ASCII string. The values
2596 * are treated as milliseconds, and converted to jiffies when they are stored.
2598 * This routine will ensure the values are within the range specified by
2599 * table->extra1 (min) and table->extra2 (max).
2601 * Returns 0 on success.
2603 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2605 void __user
*buffer
,
2606 size_t *lenp
, loff_t
*ppos
)
2608 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2609 lenp
, ppos
, HZ
, 1000l);
2613 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2615 int write
, void *data
)
2618 if (*lvalp
> LONG_MAX
/ HZ
)
2620 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2626 lval
= (unsigned long)-val
;
2629 lval
= (unsigned long)val
;
2636 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2638 int write
, void *data
)
2641 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2643 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2649 lval
= (unsigned long)-val
;
2652 lval
= (unsigned long)val
;
2654 *lvalp
= jiffies_to_clock_t(lval
);
2659 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2661 int write
, void *data
)
2664 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2670 lval
= (unsigned long)-val
;
2673 lval
= (unsigned long)val
;
2675 *lvalp
= jiffies_to_msecs(lval
);
2681 * proc_dointvec_jiffies - read a vector of integers as seconds
2682 * @table: the sysctl table
2683 * @write: %TRUE if this is a write to the sysctl file
2684 * @filp: the file structure
2685 * @buffer: the user buffer
2686 * @lenp: the size of the user buffer
2687 * @ppos: file position
2689 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2690 * values from/to the user buffer, treated as an ASCII string.
2691 * The values read are assumed to be in seconds, and are converted into
2694 * Returns 0 on success.
2696 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2697 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2699 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2700 do_proc_dointvec_jiffies_conv
,NULL
);
2704 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2705 * @table: the sysctl table
2706 * @write: %TRUE if this is a write to the sysctl file
2707 * @filp: the file structure
2708 * @buffer: the user buffer
2709 * @lenp: the size of the user buffer
2710 * @ppos: pointer to the file position
2712 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2713 * values from/to the user buffer, treated as an ASCII string.
2714 * The values read are assumed to be in 1/USER_HZ seconds, and
2715 * are converted into jiffies.
2717 * Returns 0 on success.
2719 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2720 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2722 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2723 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2727 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2728 * @table: the sysctl table
2729 * @write: %TRUE if this is a write to the sysctl file
2730 * @filp: the file structure
2731 * @buffer: the user buffer
2732 * @lenp: the size of the user buffer
2733 * @ppos: file position
2734 * @ppos: the current position in the file
2736 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2737 * values from/to the user buffer, treated as an ASCII string.
2738 * The values read are assumed to be in 1/1000 seconds, and
2739 * are converted into jiffies.
2741 * Returns 0 on success.
2743 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2744 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2746 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2747 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2750 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2751 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2753 struct pid
*new_pid
;
2757 tmp
= pid_vnr(cad_pid
);
2759 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2760 lenp
, ppos
, NULL
, NULL
);
2764 new_pid
= find_get_pid(tmp
);
2768 put_pid(xchg(&cad_pid
, new_pid
));
2772 #else /* CONFIG_PROC_FS */
2774 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2775 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2780 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2781 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2786 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2787 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2792 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2793 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2798 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2799 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2804 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2805 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2810 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2811 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2816 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2818 void __user
*buffer
,
2819 size_t *lenp
, loff_t
*ppos
)
2825 #endif /* CONFIG_PROC_FS */
2828 #ifdef CONFIG_SYSCTL_SYSCALL
2830 * General sysctl support routines
2833 /* The generic sysctl data routine (used if no strategy routine supplied) */
2834 int sysctl_data(struct ctl_table
*table
,
2835 void __user
*oldval
, size_t __user
*oldlenp
,
2836 void __user
*newval
, size_t newlen
)
2840 /* Get out of I don't have a variable */
2841 if (!table
->data
|| !table
->maxlen
)
2844 if (oldval
&& oldlenp
) {
2845 if (get_user(len
, oldlenp
))
2848 if (len
> table
->maxlen
)
2849 len
= table
->maxlen
;
2850 if (copy_to_user(oldval
, table
->data
, len
))
2852 if (put_user(len
, oldlenp
))
2857 if (newval
&& newlen
) {
2858 if (newlen
> table
->maxlen
)
2859 newlen
= table
->maxlen
;
2861 if (copy_from_user(table
->data
, newval
, newlen
))
2867 /* The generic string strategy routine: */
2868 int sysctl_string(struct ctl_table
*table
,
2869 void __user
*oldval
, size_t __user
*oldlenp
,
2870 void __user
*newval
, size_t newlen
)
2872 if (!table
->data
|| !table
->maxlen
)
2875 if (oldval
&& oldlenp
) {
2877 if (get_user(bufsize
, oldlenp
))
2880 size_t len
= strlen(table
->data
), copied
;
2882 /* This shouldn't trigger for a well-formed sysctl */
2883 if (len
> table
->maxlen
)
2884 len
= table
->maxlen
;
2886 /* Copy up to a max of bufsize-1 bytes of the string */
2887 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2889 if (copy_to_user(oldval
, table
->data
, copied
) ||
2890 put_user(0, (char __user
*)(oldval
+ copied
)))
2892 if (put_user(len
, oldlenp
))
2896 if (newval
&& newlen
) {
2897 size_t len
= newlen
;
2898 if (len
> table
->maxlen
)
2899 len
= table
->maxlen
;
2900 if(copy_from_user(table
->data
, newval
, len
))
2902 if (len
== table
->maxlen
)
2904 ((char *) table
->data
)[len
] = 0;
2910 * This function makes sure that all of the integers in the vector
2911 * are between the minimum and maximum values given in the arrays
2912 * table->extra1 and table->extra2, respectively.
2914 int sysctl_intvec(struct ctl_table
*table
,
2915 void __user
*oldval
, size_t __user
*oldlenp
,
2916 void __user
*newval
, size_t newlen
)
2919 if (newval
&& newlen
) {
2920 int __user
*vec
= (int __user
*) newval
;
2921 int *min
= (int *) table
->extra1
;
2922 int *max
= (int *) table
->extra2
;
2926 if (newlen
% sizeof(int) != 0)
2929 if (!table
->extra1
&& !table
->extra2
)
2932 if (newlen
> table
->maxlen
)
2933 newlen
= table
->maxlen
;
2934 length
= newlen
/ sizeof(int);
2936 for (i
= 0; i
< length
; i
++) {
2938 if (get_user(value
, vec
+ i
))
2940 if (min
&& value
< min
[i
])
2942 if (max
&& value
> max
[i
])
2949 /* Strategy function to convert jiffies to seconds */
2950 int sysctl_jiffies(struct ctl_table
*table
,
2951 void __user
*oldval
, size_t __user
*oldlenp
,
2952 void __user
*newval
, size_t newlen
)
2954 if (oldval
&& oldlenp
) {
2957 if (get_user(olen
, oldlenp
))
2962 if (olen
< sizeof(int))
2965 val
= *(int *)(table
->data
) / HZ
;
2966 if (put_user(val
, (int __user
*)oldval
))
2968 if (put_user(sizeof(int), oldlenp
))
2972 if (newval
&& newlen
) {
2974 if (newlen
!= sizeof(int))
2976 if (get_user(new, (int __user
*)newval
))
2978 *(int *)(table
->data
) = new*HZ
;
2983 /* Strategy function to convert jiffies to seconds */
2984 int sysctl_ms_jiffies(struct ctl_table
*table
,
2985 void __user
*oldval
, size_t __user
*oldlenp
,
2986 void __user
*newval
, size_t newlen
)
2988 if (oldval
&& oldlenp
) {
2991 if (get_user(olen
, oldlenp
))
2996 if (olen
< sizeof(int))
2999 val
= jiffies_to_msecs(*(int *)(table
->data
));
3000 if (put_user(val
, (int __user
*)oldval
))
3002 if (put_user(sizeof(int), oldlenp
))
3006 if (newval
&& newlen
) {
3008 if (newlen
!= sizeof(int))
3010 if (get_user(new, (int __user
*)newval
))
3012 *(int *)(table
->data
) = msecs_to_jiffies(new);
3019 #else /* CONFIG_SYSCTL_SYSCALL */
3022 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
3024 struct __sysctl_args tmp
;
3027 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
3030 error
= deprecated_sysctl_warning(&tmp
);
3032 /* If no error reading the parameters then just -ENOSYS ... */
3039 int sysctl_data(struct ctl_table
*table
,
3040 void __user
*oldval
, size_t __user
*oldlenp
,
3041 void __user
*newval
, size_t newlen
)
3046 int sysctl_string(struct ctl_table
*table
,
3047 void __user
*oldval
, size_t __user
*oldlenp
,
3048 void __user
*newval
, size_t newlen
)
3053 int sysctl_intvec(struct ctl_table
*table
,
3054 void __user
*oldval
, size_t __user
*oldlenp
,
3055 void __user
*newval
, size_t newlen
)
3060 int sysctl_jiffies(struct ctl_table
*table
,
3061 void __user
*oldval
, size_t __user
*oldlenp
,
3062 void __user
*newval
, size_t newlen
)
3067 int sysctl_ms_jiffies(struct ctl_table
*table
,
3068 void __user
*oldval
, size_t __user
*oldlenp
,
3069 void __user
*newval
, size_t newlen
)
3074 #endif /* CONFIG_SYSCTL_SYSCALL */
3076 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
3078 static int msg_count
;
3079 int name
[CTL_MAXNAME
];
3082 /* Check args->nlen. */
3083 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
3086 /* Read in the sysctl name for better debug message logging */
3087 for (i
= 0; i
< args
->nlen
; i
++)
3088 if (get_user(name
[i
], args
->name
+ i
))
3091 /* Ignore accesses to kernel.version */
3092 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
3095 if (msg_count
< 5) {
3098 "warning: process `%s' used the deprecated sysctl "
3099 "system call with ", current
->comm
);
3100 for (i
= 0; i
< args
->nlen
; i
++)
3101 printk("%d.", name
[i
]);
3108 * No sense putting this after each symbol definition, twice,
3109 * exception granted :-)
3111 EXPORT_SYMBOL(proc_dointvec
);
3112 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3113 EXPORT_SYMBOL(proc_dointvec_minmax
);
3114 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3115 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3116 EXPORT_SYMBOL(proc_dostring
);
3117 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3118 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3119 EXPORT_SYMBOL(register_sysctl_table
);
3120 EXPORT_SYMBOL(register_sysctl_paths
);
3121 EXPORT_SYMBOL(sysctl_intvec
);
3122 EXPORT_SYMBOL(sysctl_jiffies
);
3123 EXPORT_SYMBOL(sysctl_ms_jiffies
);
3124 EXPORT_SYMBOL(sysctl_string
);
3125 EXPORT_SYMBOL(sysctl_data
);
3126 EXPORT_SYMBOL(unregister_sysctl_table
);