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>
52 #include <linux/perf_counter.h>
54 #include <asm/uaccess.h>
55 #include <asm/processor.h>
59 #include <asm/stacktrace.h>
63 static int deprecated_sysctl_warning(struct __sysctl_args
*args
);
65 #if defined(CONFIG_SYSCTL)
67 /* External variables not in a header file. */
69 extern int print_fatal_signals
;
70 extern int sysctl_overcommit_memory
;
71 extern int sysctl_overcommit_ratio
;
72 extern int sysctl_panic_on_oom
;
73 extern int sysctl_oom_kill_allocating_task
;
74 extern int sysctl_oom_dump_tasks
;
75 extern int max_threads
;
76 extern int core_uses_pid
;
77 extern int suid_dumpable
;
78 extern char core_pattern
[];
80 extern int min_free_kbytes
;
81 extern int pid_max_min
, pid_max_max
;
82 extern int sysctl_drop_caches
;
83 extern int percpu_pagelist_fraction
;
84 extern int compat_log
;
85 extern int latencytop_enabled
;
86 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
88 extern int sysctl_nr_trim_pages
;
90 #ifdef CONFIG_RCU_TORTURE_TEST
91 extern int rcutorture_runnable
;
92 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
94 /* Constants used for minimum and maximum */
95 #ifdef CONFIG_DETECT_SOFTLOCKUP
96 static int sixty
= 60;
97 static int neg_one
= -1;
101 static int __maybe_unused one
= 1;
102 static int __maybe_unused two
= 2;
103 static unsigned long one_ul
= 1;
104 static int one_hundred
= 100;
105 static int one_thousand
= 1000;
107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108 static int maxolduid
= 65535;
109 static int minolduid
;
110 static int min_percpu_pagelist_fract
= 8;
112 static int ngroups_max
= NGROUPS_MAX
;
114 #ifdef CONFIG_MODULES
115 extern char modprobe_path
[];
117 #ifdef CONFIG_CHR_DEV_SG
118 extern int sg_big_buff
;
122 #include <asm/system.h>
125 #ifdef CONFIG_SPARC64
126 extern int sysctl_tsb_ratio
;
130 extern int pwrsw_enabled
;
131 extern int unaligned_enabled
;
135 #ifdef CONFIG_MATHEMU
136 extern int sysctl_ieee_emulation_warnings
;
138 extern int sysctl_userprocess_debug
;
139 extern int spin_retry
;
142 #ifdef CONFIG_BSD_PROCESS_ACCT
143 extern int acct_parm
[];
147 extern int no_unaligned_warning
;
148 extern int unaligned_dump_stack
;
151 #ifdef CONFIG_RT_MUTEXES
152 extern int max_lock_depth
;
155 #ifdef CONFIG_PROC_SYSCTL
156 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
157 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
158 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
159 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
162 static struct ctl_table root_table
[];
163 static struct ctl_table_root sysctl_table_root
;
164 static struct ctl_table_header root_table_header
= {
166 .ctl_table
= root_table
,
167 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.default_set
.list
),
168 .root
= &sysctl_table_root
,
169 .set
= &sysctl_table_root
.default_set
,
171 static struct ctl_table_root sysctl_table_root
= {
172 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
173 .default_set
.list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
176 static struct ctl_table kern_table
[];
177 static struct ctl_table vm_table
[];
178 static struct ctl_table fs_table
[];
179 static struct ctl_table debug_table
[];
180 static struct ctl_table dev_table
[];
181 extern struct ctl_table random_table
[];
182 #ifdef CONFIG_INOTIFY_USER
183 extern struct ctl_table inotify_table
[];
186 extern struct ctl_table epoll_table
[];
189 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
190 int sysctl_legacy_va_layout
;
193 extern int prove_locking
;
194 extern int lock_stat
;
196 /* The default sysctl tables: */
198 static struct ctl_table root_table
[] = {
200 .ctl_name
= CTL_KERN
,
201 .procname
= "kernel",
218 .ctl_name
= CTL_DEBUG
,
221 .child
= debug_table
,
230 * NOTE: do not add new entries to this table unless you have read
231 * Documentation/sysctl/ctl_unnumbered.txt
236 #ifdef CONFIG_SCHED_DEBUG
237 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
238 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
239 static int min_wakeup_granularity_ns
; /* 0 usecs */
240 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
243 static struct ctl_table kern_table
[] = {
244 #ifdef CONFIG_SCHED_DEBUG
246 .ctl_name
= CTL_UNNUMBERED
,
247 .procname
= "sched_min_granularity_ns",
248 .data
= &sysctl_sched_min_granularity
,
249 .maxlen
= sizeof(unsigned int),
251 .proc_handler
= &sched_nr_latency_handler
,
252 .strategy
= &sysctl_intvec
,
253 .extra1
= &min_sched_granularity_ns
,
254 .extra2
= &max_sched_granularity_ns
,
257 .ctl_name
= CTL_UNNUMBERED
,
258 .procname
= "sched_latency_ns",
259 .data
= &sysctl_sched_latency
,
260 .maxlen
= sizeof(unsigned int),
262 .proc_handler
= &sched_nr_latency_handler
,
263 .strategy
= &sysctl_intvec
,
264 .extra1
= &min_sched_granularity_ns
,
265 .extra2
= &max_sched_granularity_ns
,
268 .ctl_name
= CTL_UNNUMBERED
,
269 .procname
= "sched_wakeup_granularity_ns",
270 .data
= &sysctl_sched_wakeup_granularity
,
271 .maxlen
= sizeof(unsigned int),
273 .proc_handler
= &proc_dointvec_minmax
,
274 .strategy
= &sysctl_intvec
,
275 .extra1
= &min_wakeup_granularity_ns
,
276 .extra2
= &max_wakeup_granularity_ns
,
279 .ctl_name
= CTL_UNNUMBERED
,
280 .procname
= "sched_shares_ratelimit",
281 .data
= &sysctl_sched_shares_ratelimit
,
282 .maxlen
= sizeof(unsigned int),
284 .proc_handler
= &proc_dointvec
,
287 .ctl_name
= CTL_UNNUMBERED
,
288 .procname
= "sched_shares_thresh",
289 .data
= &sysctl_sched_shares_thresh
,
290 .maxlen
= sizeof(unsigned int),
292 .proc_handler
= &proc_dointvec_minmax
,
293 .strategy
= &sysctl_intvec
,
297 .ctl_name
= CTL_UNNUMBERED
,
298 .procname
= "sched_child_runs_first",
299 .data
= &sysctl_sched_child_runs_first
,
300 .maxlen
= sizeof(unsigned int),
302 .proc_handler
= &proc_dointvec
,
305 .ctl_name
= CTL_UNNUMBERED
,
306 .procname
= "sched_features",
307 .data
= &sysctl_sched_features
,
308 .maxlen
= sizeof(unsigned int),
310 .proc_handler
= &proc_dointvec
,
313 .ctl_name
= CTL_UNNUMBERED
,
314 .procname
= "sched_migration_cost",
315 .data
= &sysctl_sched_migration_cost
,
316 .maxlen
= sizeof(unsigned int),
318 .proc_handler
= &proc_dointvec
,
321 .ctl_name
= CTL_UNNUMBERED
,
322 .procname
= "sched_nr_migrate",
323 .data
= &sysctl_sched_nr_migrate
,
324 .maxlen
= sizeof(unsigned int),
326 .proc_handler
= &proc_dointvec
,
330 .ctl_name
= CTL_UNNUMBERED
,
331 .procname
= "sched_rt_period_us",
332 .data
= &sysctl_sched_rt_period
,
333 .maxlen
= sizeof(unsigned int),
335 .proc_handler
= &sched_rt_handler
,
338 .ctl_name
= CTL_UNNUMBERED
,
339 .procname
= "sched_rt_runtime_us",
340 .data
= &sysctl_sched_rt_runtime
,
341 .maxlen
= sizeof(int),
343 .proc_handler
= &sched_rt_handler
,
346 .ctl_name
= CTL_UNNUMBERED
,
347 .procname
= "sched_compat_yield",
348 .data
= &sysctl_sched_compat_yield
,
349 .maxlen
= sizeof(unsigned int),
351 .proc_handler
= &proc_dointvec
,
353 #ifdef CONFIG_PROVE_LOCKING
355 .ctl_name
= CTL_UNNUMBERED
,
356 .procname
= "prove_locking",
357 .data
= &prove_locking
,
358 .maxlen
= sizeof(int),
360 .proc_handler
= &proc_dointvec
,
363 #ifdef CONFIG_LOCK_STAT
365 .ctl_name
= CTL_UNNUMBERED
,
366 .procname
= "lock_stat",
368 .maxlen
= sizeof(int),
370 .proc_handler
= &proc_dointvec
,
374 .ctl_name
= KERN_PANIC
,
376 .data
= &panic_timeout
,
377 .maxlen
= sizeof(int),
379 .proc_handler
= &proc_dointvec
,
382 .ctl_name
= KERN_CORE_USES_PID
,
383 .procname
= "core_uses_pid",
384 .data
= &core_uses_pid
,
385 .maxlen
= sizeof(int),
387 .proc_handler
= &proc_dointvec
,
390 .ctl_name
= KERN_CORE_PATTERN
,
391 .procname
= "core_pattern",
392 .data
= core_pattern
,
393 .maxlen
= CORENAME_MAX_SIZE
,
395 .proc_handler
= &proc_dostring
,
396 .strategy
= &sysctl_string
,
398 #ifdef CONFIG_PROC_SYSCTL
400 .procname
= "tainted",
401 .maxlen
= sizeof(long),
403 .proc_handler
= &proc_taint
,
406 #ifdef CONFIG_LATENCYTOP
408 .procname
= "latencytop",
409 .data
= &latencytop_enabled
,
410 .maxlen
= sizeof(int),
412 .proc_handler
= &proc_dointvec
,
415 #ifdef CONFIG_BLK_DEV_INITRD
417 .ctl_name
= KERN_REALROOTDEV
,
418 .procname
= "real-root-dev",
419 .data
= &real_root_dev
,
420 .maxlen
= sizeof(int),
422 .proc_handler
= &proc_dointvec
,
426 .ctl_name
= CTL_UNNUMBERED
,
427 .procname
= "print-fatal-signals",
428 .data
= &print_fatal_signals
,
429 .maxlen
= sizeof(int),
431 .proc_handler
= &proc_dointvec
,
435 .ctl_name
= KERN_SPARC_REBOOT
,
436 .procname
= "reboot-cmd",
437 .data
= reboot_command
,
440 .proc_handler
= &proc_dostring
,
441 .strategy
= &sysctl_string
,
444 .ctl_name
= KERN_SPARC_STOP_A
,
445 .procname
= "stop-a",
446 .data
= &stop_a_enabled
,
447 .maxlen
= sizeof (int),
449 .proc_handler
= &proc_dointvec
,
452 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
453 .procname
= "scons-poweroff",
454 .data
= &scons_pwroff
,
455 .maxlen
= sizeof (int),
457 .proc_handler
= &proc_dointvec
,
460 #ifdef CONFIG_SPARC64
462 .ctl_name
= CTL_UNNUMBERED
,
463 .procname
= "tsb-ratio",
464 .data
= &sysctl_tsb_ratio
,
465 .maxlen
= sizeof (int),
467 .proc_handler
= &proc_dointvec
,
472 .ctl_name
= KERN_HPPA_PWRSW
,
473 .procname
= "soft-power",
474 .data
= &pwrsw_enabled
,
475 .maxlen
= sizeof (int),
477 .proc_handler
= &proc_dointvec
,
480 .ctl_name
= KERN_HPPA_UNALIGNED
,
481 .procname
= "unaligned-trap",
482 .data
= &unaligned_enabled
,
483 .maxlen
= sizeof (int),
485 .proc_handler
= &proc_dointvec
,
489 .ctl_name
= KERN_CTLALTDEL
,
490 .procname
= "ctrl-alt-del",
492 .maxlen
= sizeof(int),
494 .proc_handler
= &proc_dointvec
,
496 #ifdef CONFIG_FUNCTION_TRACER
498 .ctl_name
= CTL_UNNUMBERED
,
499 .procname
= "ftrace_enabled",
500 .data
= &ftrace_enabled
,
501 .maxlen
= sizeof(int),
503 .proc_handler
= &ftrace_enable_sysctl
,
506 #ifdef CONFIG_STACK_TRACER
508 .ctl_name
= CTL_UNNUMBERED
,
509 .procname
= "stack_tracer_enabled",
510 .data
= &stack_tracer_enabled
,
511 .maxlen
= sizeof(int),
513 .proc_handler
= &stack_trace_sysctl
,
516 #ifdef CONFIG_TRACING
518 .ctl_name
= CTL_UNNUMBERED
,
519 .procname
= "ftrace_dump_on_oops",
520 .data
= &ftrace_dump_on_oops
,
521 .maxlen
= sizeof(int),
523 .proc_handler
= &proc_dointvec
,
526 #ifdef CONFIG_MODULES
528 .ctl_name
= KERN_MODPROBE
,
529 .procname
= "modprobe",
530 .data
= &modprobe_path
,
531 .maxlen
= KMOD_PATH_LEN
,
533 .proc_handler
= &proc_dostring
,
534 .strategy
= &sysctl_string
,
537 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
539 .ctl_name
= KERN_HOTPLUG
,
540 .procname
= "hotplug",
541 .data
= &uevent_helper
,
542 .maxlen
= UEVENT_HELPER_PATH_LEN
,
544 .proc_handler
= &proc_dostring
,
545 .strategy
= &sysctl_string
,
548 #ifdef CONFIG_CHR_DEV_SG
550 .ctl_name
= KERN_SG_BIG_BUFF
,
551 .procname
= "sg-big-buff",
552 .data
= &sg_big_buff
,
553 .maxlen
= sizeof (int),
555 .proc_handler
= &proc_dointvec
,
558 #ifdef CONFIG_BSD_PROCESS_ACCT
560 .ctl_name
= KERN_ACCT
,
563 .maxlen
= 3*sizeof(int),
565 .proc_handler
= &proc_dointvec
,
568 #ifdef CONFIG_MAGIC_SYSRQ
570 .ctl_name
= KERN_SYSRQ
,
572 .data
= &__sysrq_enabled
,
573 .maxlen
= sizeof (int),
575 .proc_handler
= &proc_dointvec
,
578 #ifdef CONFIG_PROC_SYSCTL
580 .procname
= "cad_pid",
582 .maxlen
= sizeof (int),
584 .proc_handler
= &proc_do_cad_pid
,
588 .ctl_name
= KERN_MAX_THREADS
,
589 .procname
= "threads-max",
590 .data
= &max_threads
,
591 .maxlen
= sizeof(int),
593 .proc_handler
= &proc_dointvec
,
596 .ctl_name
= KERN_RANDOM
,
597 .procname
= "random",
599 .child
= random_table
,
602 .ctl_name
= KERN_OVERFLOWUID
,
603 .procname
= "overflowuid",
604 .data
= &overflowuid
,
605 .maxlen
= sizeof(int),
607 .proc_handler
= &proc_dointvec_minmax
,
608 .strategy
= &sysctl_intvec
,
609 .extra1
= &minolduid
,
610 .extra2
= &maxolduid
,
613 .ctl_name
= KERN_OVERFLOWGID
,
614 .procname
= "overflowgid",
615 .data
= &overflowgid
,
616 .maxlen
= sizeof(int),
618 .proc_handler
= &proc_dointvec_minmax
,
619 .strategy
= &sysctl_intvec
,
620 .extra1
= &minolduid
,
621 .extra2
= &maxolduid
,
624 #ifdef CONFIG_MATHEMU
626 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
627 .procname
= "ieee_emulation_warnings",
628 .data
= &sysctl_ieee_emulation_warnings
,
629 .maxlen
= sizeof(int),
631 .proc_handler
= &proc_dointvec
,
635 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
636 .procname
= "userprocess_debug",
637 .data
= &sysctl_userprocess_debug
,
638 .maxlen
= sizeof(int),
640 .proc_handler
= &proc_dointvec
,
644 .ctl_name
= KERN_PIDMAX
,
645 .procname
= "pid_max",
647 .maxlen
= sizeof (int),
649 .proc_handler
= &proc_dointvec_minmax
,
650 .strategy
= sysctl_intvec
,
651 .extra1
= &pid_max_min
,
652 .extra2
= &pid_max_max
,
655 .ctl_name
= KERN_PANIC_ON_OOPS
,
656 .procname
= "panic_on_oops",
657 .data
= &panic_on_oops
,
658 .maxlen
= sizeof(int),
660 .proc_handler
= &proc_dointvec
,
662 #if defined CONFIG_PRINTK
664 .ctl_name
= KERN_PRINTK
,
665 .procname
= "printk",
666 .data
= &console_loglevel
,
667 .maxlen
= 4*sizeof(int),
669 .proc_handler
= &proc_dointvec
,
672 .ctl_name
= KERN_PRINTK_RATELIMIT
,
673 .procname
= "printk_ratelimit",
674 .data
= &printk_ratelimit_state
.interval
,
675 .maxlen
= sizeof(int),
677 .proc_handler
= &proc_dointvec_jiffies
,
678 .strategy
= &sysctl_jiffies
,
681 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
682 .procname
= "printk_ratelimit_burst",
683 .data
= &printk_ratelimit_state
.burst
,
684 .maxlen
= sizeof(int),
686 .proc_handler
= &proc_dointvec
,
690 .ctl_name
= KERN_NGROUPS_MAX
,
691 .procname
= "ngroups_max",
692 .data
= &ngroups_max
,
693 .maxlen
= sizeof (int),
695 .proc_handler
= &proc_dointvec
,
697 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
699 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
700 .procname
= "unknown_nmi_panic",
701 .data
= &unknown_nmi_panic
,
702 .maxlen
= sizeof (int),
704 .proc_handler
= &proc_dointvec
,
707 .procname
= "nmi_watchdog",
708 .data
= &nmi_watchdog_enabled
,
709 .maxlen
= sizeof (int),
711 .proc_handler
= &proc_nmi_enabled
,
714 #if defined(CONFIG_X86)
716 .ctl_name
= KERN_PANIC_ON_NMI
,
717 .procname
= "panic_on_unrecovered_nmi",
718 .data
= &panic_on_unrecovered_nmi
,
719 .maxlen
= sizeof(int),
721 .proc_handler
= &proc_dointvec
,
724 .ctl_name
= KERN_BOOTLOADER_TYPE
,
725 .procname
= "bootloader_type",
726 .data
= &bootloader_type
,
727 .maxlen
= sizeof (int),
729 .proc_handler
= &proc_dointvec
,
732 .ctl_name
= CTL_UNNUMBERED
,
733 .procname
= "kstack_depth_to_print",
734 .data
= &kstack_depth_to_print
,
735 .maxlen
= sizeof(int),
737 .proc_handler
= &proc_dointvec
,
740 .ctl_name
= CTL_UNNUMBERED
,
741 .procname
= "io_delay_type",
742 .data
= &io_delay_type
,
743 .maxlen
= sizeof(int),
745 .proc_handler
= &proc_dointvec
,
748 #if defined(CONFIG_MMU)
750 .ctl_name
= KERN_RANDOMIZE
,
751 .procname
= "randomize_va_space",
752 .data
= &randomize_va_space
,
753 .maxlen
= sizeof(int),
755 .proc_handler
= &proc_dointvec
,
758 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
760 .ctl_name
= KERN_SPIN_RETRY
,
761 .procname
= "spin_retry",
763 .maxlen
= sizeof (int),
765 .proc_handler
= &proc_dointvec
,
768 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
770 .procname
= "acpi_video_flags",
771 .data
= &acpi_realmode_flags
,
772 .maxlen
= sizeof (unsigned long),
774 .proc_handler
= &proc_doulongvec_minmax
,
779 .ctl_name
= KERN_IA64_UNALIGNED
,
780 .procname
= "ignore-unaligned-usertrap",
781 .data
= &no_unaligned_warning
,
782 .maxlen
= sizeof (int),
784 .proc_handler
= &proc_dointvec
,
787 .ctl_name
= CTL_UNNUMBERED
,
788 .procname
= "unaligned-dump-stack",
789 .data
= &unaligned_dump_stack
,
790 .maxlen
= sizeof (int),
792 .proc_handler
= &proc_dointvec
,
795 #ifdef CONFIG_DETECT_SOFTLOCKUP
797 .ctl_name
= CTL_UNNUMBERED
,
798 .procname
= "softlockup_panic",
799 .data
= &softlockup_panic
,
800 .maxlen
= sizeof(int),
802 .proc_handler
= &proc_dointvec_minmax
,
803 .strategy
= &sysctl_intvec
,
808 .ctl_name
= CTL_UNNUMBERED
,
809 .procname
= "softlockup_thresh",
810 .data
= &softlockup_thresh
,
811 .maxlen
= sizeof(int),
813 .proc_handler
= &proc_dosoftlockup_thresh
,
814 .strategy
= &sysctl_intvec
,
819 #ifdef CONFIG_DETECT_HUNG_TASK
821 .ctl_name
= CTL_UNNUMBERED
,
822 .procname
= "hung_task_panic",
823 .data
= &sysctl_hung_task_panic
,
824 .maxlen
= sizeof(int),
826 .proc_handler
= &proc_dointvec_minmax
,
827 .strategy
= &sysctl_intvec
,
832 .ctl_name
= CTL_UNNUMBERED
,
833 .procname
= "hung_task_check_count",
834 .data
= &sysctl_hung_task_check_count
,
835 .maxlen
= sizeof(unsigned long),
837 .proc_handler
= &proc_doulongvec_minmax
,
838 .strategy
= &sysctl_intvec
,
841 .ctl_name
= CTL_UNNUMBERED
,
842 .procname
= "hung_task_timeout_secs",
843 .data
= &sysctl_hung_task_timeout_secs
,
844 .maxlen
= sizeof(unsigned long),
846 .proc_handler
= &proc_dohung_task_timeout_secs
,
847 .strategy
= &sysctl_intvec
,
850 .ctl_name
= CTL_UNNUMBERED
,
851 .procname
= "hung_task_warnings",
852 .data
= &sysctl_hung_task_warnings
,
853 .maxlen
= sizeof(unsigned long),
855 .proc_handler
= &proc_doulongvec_minmax
,
856 .strategy
= &sysctl_intvec
,
861 .ctl_name
= KERN_COMPAT_LOG
,
862 .procname
= "compat-log",
864 .maxlen
= sizeof (int),
866 .proc_handler
= &proc_dointvec
,
869 #ifdef CONFIG_RT_MUTEXES
871 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
872 .procname
= "max_lock_depth",
873 .data
= &max_lock_depth
,
874 .maxlen
= sizeof(int),
876 .proc_handler
= &proc_dointvec
,
880 .ctl_name
= CTL_UNNUMBERED
,
881 .procname
= "poweroff_cmd",
882 .data
= &poweroff_cmd
,
883 .maxlen
= POWEROFF_CMD_PATH_LEN
,
885 .proc_handler
= &proc_dostring
,
886 .strategy
= &sysctl_string
,
890 .ctl_name
= CTL_UNNUMBERED
,
893 .child
= key_sysctls
,
896 #ifdef CONFIG_RCU_TORTURE_TEST
898 .ctl_name
= CTL_UNNUMBERED
,
899 .procname
= "rcutorture_runnable",
900 .data
= &rcutorture_runnable
,
901 .maxlen
= sizeof(int),
903 .proc_handler
= &proc_dointvec
,
906 #ifdef CONFIG_SLOW_WORK
908 .ctl_name
= CTL_UNNUMBERED
,
909 .procname
= "slow-work",
911 .child
= slow_work_sysctls
,
914 #ifdef CONFIG_PERF_COUNTERS
916 .ctl_name
= CTL_UNNUMBERED
,
917 .procname
= "perf_counter_privileged",
918 .data
= &sysctl_perf_counter_priv
,
919 .maxlen
= sizeof(sysctl_perf_counter_priv
),
921 .proc_handler
= &proc_dointvec
,
925 * NOTE: do not add new entries to this table unless you have read
926 * Documentation/sysctl/ctl_unnumbered.txt
931 static struct ctl_table vm_table
[] = {
933 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
934 .procname
= "overcommit_memory",
935 .data
= &sysctl_overcommit_memory
,
936 .maxlen
= sizeof(sysctl_overcommit_memory
),
938 .proc_handler
= &proc_dointvec
,
941 .ctl_name
= VM_PANIC_ON_OOM
,
942 .procname
= "panic_on_oom",
943 .data
= &sysctl_panic_on_oom
,
944 .maxlen
= sizeof(sysctl_panic_on_oom
),
946 .proc_handler
= &proc_dointvec
,
949 .ctl_name
= CTL_UNNUMBERED
,
950 .procname
= "oom_kill_allocating_task",
951 .data
= &sysctl_oom_kill_allocating_task
,
952 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
954 .proc_handler
= &proc_dointvec
,
957 .ctl_name
= CTL_UNNUMBERED
,
958 .procname
= "oom_dump_tasks",
959 .data
= &sysctl_oom_dump_tasks
,
960 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
962 .proc_handler
= &proc_dointvec
,
965 .ctl_name
= VM_OVERCOMMIT_RATIO
,
966 .procname
= "overcommit_ratio",
967 .data
= &sysctl_overcommit_ratio
,
968 .maxlen
= sizeof(sysctl_overcommit_ratio
),
970 .proc_handler
= &proc_dointvec
,
973 .ctl_name
= VM_PAGE_CLUSTER
,
974 .procname
= "page-cluster",
975 .data
= &page_cluster
,
976 .maxlen
= sizeof(int),
978 .proc_handler
= &proc_dointvec
,
981 .ctl_name
= VM_DIRTY_BACKGROUND
,
982 .procname
= "dirty_background_ratio",
983 .data
= &dirty_background_ratio
,
984 .maxlen
= sizeof(dirty_background_ratio
),
986 .proc_handler
= &dirty_background_ratio_handler
,
987 .strategy
= &sysctl_intvec
,
989 .extra2
= &one_hundred
,
992 .ctl_name
= CTL_UNNUMBERED
,
993 .procname
= "dirty_background_bytes",
994 .data
= &dirty_background_bytes
,
995 .maxlen
= sizeof(dirty_background_bytes
),
997 .proc_handler
= &dirty_background_bytes_handler
,
998 .strategy
= &sysctl_intvec
,
1002 .ctl_name
= VM_DIRTY_RATIO
,
1003 .procname
= "dirty_ratio",
1004 .data
= &vm_dirty_ratio
,
1005 .maxlen
= sizeof(vm_dirty_ratio
),
1007 .proc_handler
= &dirty_ratio_handler
,
1008 .strategy
= &sysctl_intvec
,
1010 .extra2
= &one_hundred
,
1013 .ctl_name
= CTL_UNNUMBERED
,
1014 .procname
= "dirty_bytes",
1015 .data
= &vm_dirty_bytes
,
1016 .maxlen
= sizeof(vm_dirty_bytes
),
1018 .proc_handler
= &dirty_bytes_handler
,
1019 .strategy
= &sysctl_intvec
,
1023 .procname
= "dirty_writeback_centisecs",
1024 .data
= &dirty_writeback_interval
,
1025 .maxlen
= sizeof(dirty_writeback_interval
),
1027 .proc_handler
= &dirty_writeback_centisecs_handler
,
1030 .procname
= "dirty_expire_centisecs",
1031 .data
= &dirty_expire_interval
,
1032 .maxlen
= sizeof(dirty_expire_interval
),
1034 .proc_handler
= &proc_dointvec
,
1037 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
1038 .procname
= "nr_pdflush_threads",
1039 .data
= &nr_pdflush_threads
,
1040 .maxlen
= sizeof nr_pdflush_threads
,
1041 .mode
= 0444 /* read-only*/,
1042 .proc_handler
= &proc_dointvec
,
1045 .ctl_name
= CTL_UNNUMBERED
,
1046 .procname
= "nr_pdflush_threads_min",
1047 .data
= &nr_pdflush_threads_min
,
1048 .maxlen
= sizeof nr_pdflush_threads_min
,
1049 .mode
= 0644 /* read-write */,
1050 .proc_handler
= &proc_dointvec_minmax
,
1051 .strategy
= &sysctl_intvec
,
1053 .extra2
= &nr_pdflush_threads_max
,
1056 .ctl_name
= CTL_UNNUMBERED
,
1057 .procname
= "nr_pdflush_threads_max",
1058 .data
= &nr_pdflush_threads_max
,
1059 .maxlen
= sizeof nr_pdflush_threads_max
,
1060 .mode
= 0644 /* read-write */,
1061 .proc_handler
= &proc_dointvec_minmax
,
1062 .strategy
= &sysctl_intvec
,
1063 .extra1
= &nr_pdflush_threads_min
,
1064 .extra2
= &one_thousand
,
1067 .ctl_name
= VM_SWAPPINESS
,
1068 .procname
= "swappiness",
1069 .data
= &vm_swappiness
,
1070 .maxlen
= sizeof(vm_swappiness
),
1072 .proc_handler
= &proc_dointvec_minmax
,
1073 .strategy
= &sysctl_intvec
,
1075 .extra2
= &one_hundred
,
1077 #ifdef CONFIG_HUGETLB_PAGE
1079 .procname
= "nr_hugepages",
1081 .maxlen
= sizeof(unsigned long),
1083 .proc_handler
= &hugetlb_sysctl_handler
,
1084 .extra1
= (void *)&hugetlb_zero
,
1085 .extra2
= (void *)&hugetlb_infinity
,
1088 .ctl_name
= VM_HUGETLB_GROUP
,
1089 .procname
= "hugetlb_shm_group",
1090 .data
= &sysctl_hugetlb_shm_group
,
1091 .maxlen
= sizeof(gid_t
),
1093 .proc_handler
= &proc_dointvec
,
1096 .ctl_name
= CTL_UNNUMBERED
,
1097 .procname
= "hugepages_treat_as_movable",
1098 .data
= &hugepages_treat_as_movable
,
1099 .maxlen
= sizeof(int),
1101 .proc_handler
= &hugetlb_treat_movable_handler
,
1104 .ctl_name
= CTL_UNNUMBERED
,
1105 .procname
= "nr_overcommit_hugepages",
1107 .maxlen
= sizeof(unsigned long),
1109 .proc_handler
= &hugetlb_overcommit_handler
,
1110 .extra1
= (void *)&hugetlb_zero
,
1111 .extra2
= (void *)&hugetlb_infinity
,
1115 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
1116 .procname
= "lowmem_reserve_ratio",
1117 .data
= &sysctl_lowmem_reserve_ratio
,
1118 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1120 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
1121 .strategy
= &sysctl_intvec
,
1124 .ctl_name
= VM_DROP_PAGECACHE
,
1125 .procname
= "drop_caches",
1126 .data
= &sysctl_drop_caches
,
1127 .maxlen
= sizeof(int),
1129 .proc_handler
= drop_caches_sysctl_handler
,
1130 .strategy
= &sysctl_intvec
,
1133 .ctl_name
= VM_MIN_FREE_KBYTES
,
1134 .procname
= "min_free_kbytes",
1135 .data
= &min_free_kbytes
,
1136 .maxlen
= sizeof(min_free_kbytes
),
1138 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1139 .strategy
= &sysctl_intvec
,
1143 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1144 .procname
= "percpu_pagelist_fraction",
1145 .data
= &percpu_pagelist_fraction
,
1146 .maxlen
= sizeof(percpu_pagelist_fraction
),
1148 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1149 .strategy
= &sysctl_intvec
,
1150 .extra1
= &min_percpu_pagelist_fract
,
1154 .ctl_name
= VM_MAX_MAP_COUNT
,
1155 .procname
= "max_map_count",
1156 .data
= &sysctl_max_map_count
,
1157 .maxlen
= sizeof(sysctl_max_map_count
),
1159 .proc_handler
= &proc_dointvec
1163 .ctl_name
= CTL_UNNUMBERED
,
1164 .procname
= "nr_trim_pages",
1165 .data
= &sysctl_nr_trim_pages
,
1166 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1168 .proc_handler
= &proc_dointvec_minmax
,
1169 .strategy
= &sysctl_intvec
,
1174 .ctl_name
= VM_LAPTOP_MODE
,
1175 .procname
= "laptop_mode",
1176 .data
= &laptop_mode
,
1177 .maxlen
= sizeof(laptop_mode
),
1179 .proc_handler
= &proc_dointvec_jiffies
,
1180 .strategy
= &sysctl_jiffies
,
1183 .ctl_name
= VM_BLOCK_DUMP
,
1184 .procname
= "block_dump",
1185 .data
= &block_dump
,
1186 .maxlen
= sizeof(block_dump
),
1188 .proc_handler
= &proc_dointvec
,
1189 .strategy
= &sysctl_intvec
,
1193 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1194 .procname
= "vfs_cache_pressure",
1195 .data
= &sysctl_vfs_cache_pressure
,
1196 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1198 .proc_handler
= &proc_dointvec
,
1199 .strategy
= &sysctl_intvec
,
1202 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1204 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1205 .procname
= "legacy_va_layout",
1206 .data
= &sysctl_legacy_va_layout
,
1207 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1209 .proc_handler
= &proc_dointvec
,
1210 .strategy
= &sysctl_intvec
,
1216 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1217 .procname
= "zone_reclaim_mode",
1218 .data
= &zone_reclaim_mode
,
1219 .maxlen
= sizeof(zone_reclaim_mode
),
1221 .proc_handler
= &proc_dointvec
,
1222 .strategy
= &sysctl_intvec
,
1226 .ctl_name
= VM_MIN_UNMAPPED
,
1227 .procname
= "min_unmapped_ratio",
1228 .data
= &sysctl_min_unmapped_ratio
,
1229 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1231 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1232 .strategy
= &sysctl_intvec
,
1234 .extra2
= &one_hundred
,
1237 .ctl_name
= VM_MIN_SLAB
,
1238 .procname
= "min_slab_ratio",
1239 .data
= &sysctl_min_slab_ratio
,
1240 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1242 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1243 .strategy
= &sysctl_intvec
,
1245 .extra2
= &one_hundred
,
1250 .ctl_name
= CTL_UNNUMBERED
,
1251 .procname
= "stat_interval",
1252 .data
= &sysctl_stat_interval
,
1253 .maxlen
= sizeof(sysctl_stat_interval
),
1255 .proc_handler
= &proc_dointvec_jiffies
,
1256 .strategy
= &sysctl_jiffies
,
1259 #ifdef CONFIG_SECURITY
1261 .ctl_name
= CTL_UNNUMBERED
,
1262 .procname
= "mmap_min_addr",
1263 .data
= &mmap_min_addr
,
1264 .maxlen
= sizeof(unsigned long),
1266 .proc_handler
= &proc_doulongvec_minmax
,
1271 .ctl_name
= CTL_UNNUMBERED
,
1272 .procname
= "numa_zonelist_order",
1273 .data
= &numa_zonelist_order
,
1274 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1276 .proc_handler
= &numa_zonelist_order_handler
,
1277 .strategy
= &sysctl_string
,
1280 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1281 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1283 .ctl_name
= VM_VDSO_ENABLED
,
1284 .procname
= "vdso_enabled",
1285 .data
= &vdso_enabled
,
1286 .maxlen
= sizeof(vdso_enabled
),
1288 .proc_handler
= &proc_dointvec
,
1289 .strategy
= &sysctl_intvec
,
1293 #ifdef CONFIG_HIGHMEM
1295 .ctl_name
= CTL_UNNUMBERED
,
1296 .procname
= "highmem_is_dirtyable",
1297 .data
= &vm_highmem_is_dirtyable
,
1298 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1300 .proc_handler
= &proc_dointvec_minmax
,
1301 .strategy
= &sysctl_intvec
,
1306 #ifdef CONFIG_UNEVICTABLE_LRU
1308 .ctl_name
= CTL_UNNUMBERED
,
1309 .procname
= "scan_unevictable_pages",
1310 .data
= &scan_unevictable_pages
,
1311 .maxlen
= sizeof(scan_unevictable_pages
),
1313 .proc_handler
= &scan_unevictable_handler
,
1317 * NOTE: do not add new entries to this table unless you have read
1318 * Documentation/sysctl/ctl_unnumbered.txt
1323 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1324 static struct ctl_table binfmt_misc_table
[] = {
1329 static struct ctl_table fs_table
[] = {
1331 .ctl_name
= FS_NRINODE
,
1332 .procname
= "inode-nr",
1333 .data
= &inodes_stat
,
1334 .maxlen
= 2*sizeof(int),
1336 .proc_handler
= &proc_dointvec
,
1339 .ctl_name
= FS_STATINODE
,
1340 .procname
= "inode-state",
1341 .data
= &inodes_stat
,
1342 .maxlen
= 7*sizeof(int),
1344 .proc_handler
= &proc_dointvec
,
1347 .procname
= "file-nr",
1348 .data
= &files_stat
,
1349 .maxlen
= 3*sizeof(int),
1351 .proc_handler
= &proc_nr_files
,
1354 .ctl_name
= FS_MAXFILE
,
1355 .procname
= "file-max",
1356 .data
= &files_stat
.max_files
,
1357 .maxlen
= sizeof(int),
1359 .proc_handler
= &proc_dointvec
,
1362 .ctl_name
= CTL_UNNUMBERED
,
1363 .procname
= "nr_open",
1364 .data
= &sysctl_nr_open
,
1365 .maxlen
= sizeof(int),
1367 .proc_handler
= &proc_dointvec_minmax
,
1368 .extra1
= &sysctl_nr_open_min
,
1369 .extra2
= &sysctl_nr_open_max
,
1372 .ctl_name
= FS_DENTRY
,
1373 .procname
= "dentry-state",
1374 .data
= &dentry_stat
,
1375 .maxlen
= 6*sizeof(int),
1377 .proc_handler
= &proc_dointvec
,
1380 .ctl_name
= FS_OVERFLOWUID
,
1381 .procname
= "overflowuid",
1382 .data
= &fs_overflowuid
,
1383 .maxlen
= sizeof(int),
1385 .proc_handler
= &proc_dointvec_minmax
,
1386 .strategy
= &sysctl_intvec
,
1387 .extra1
= &minolduid
,
1388 .extra2
= &maxolduid
,
1391 .ctl_name
= FS_OVERFLOWGID
,
1392 .procname
= "overflowgid",
1393 .data
= &fs_overflowgid
,
1394 .maxlen
= sizeof(int),
1396 .proc_handler
= &proc_dointvec_minmax
,
1397 .strategy
= &sysctl_intvec
,
1398 .extra1
= &minolduid
,
1399 .extra2
= &maxolduid
,
1401 #ifdef CONFIG_FILE_LOCKING
1403 .ctl_name
= FS_LEASES
,
1404 .procname
= "leases-enable",
1405 .data
= &leases_enable
,
1406 .maxlen
= sizeof(int),
1408 .proc_handler
= &proc_dointvec
,
1411 #ifdef CONFIG_DNOTIFY
1413 .ctl_name
= FS_DIR_NOTIFY
,
1414 .procname
= "dir-notify-enable",
1415 .data
= &dir_notify_enable
,
1416 .maxlen
= sizeof(int),
1418 .proc_handler
= &proc_dointvec
,
1422 #ifdef CONFIG_FILE_LOCKING
1424 .ctl_name
= FS_LEASE_TIME
,
1425 .procname
= "lease-break-time",
1426 .data
= &lease_break_time
,
1427 .maxlen
= sizeof(int),
1429 .proc_handler
= &proc_dointvec
,
1434 .procname
= "aio-nr",
1436 .maxlen
= sizeof(aio_nr
),
1438 .proc_handler
= &proc_doulongvec_minmax
,
1441 .procname
= "aio-max-nr",
1442 .data
= &aio_max_nr
,
1443 .maxlen
= sizeof(aio_max_nr
),
1445 .proc_handler
= &proc_doulongvec_minmax
,
1447 #endif /* CONFIG_AIO */
1448 #ifdef CONFIG_INOTIFY_USER
1450 .ctl_name
= FS_INOTIFY
,
1451 .procname
= "inotify",
1453 .child
= inotify_table
,
1458 .procname
= "epoll",
1460 .child
= epoll_table
,
1465 .ctl_name
= KERN_SETUID_DUMPABLE
,
1466 .procname
= "suid_dumpable",
1467 .data
= &suid_dumpable
,
1468 .maxlen
= sizeof(int),
1470 .proc_handler
= &proc_dointvec_minmax
,
1471 .strategy
= &sysctl_intvec
,
1475 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1477 .ctl_name
= CTL_UNNUMBERED
,
1478 .procname
= "binfmt_misc",
1480 .child
= binfmt_misc_table
,
1484 * NOTE: do not add new entries to this table unless you have read
1485 * Documentation/sysctl/ctl_unnumbered.txt
1490 static struct ctl_table debug_table
[] = {
1491 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1493 .ctl_name
= CTL_UNNUMBERED
,
1494 .procname
= "exception-trace",
1495 .data
= &show_unhandled_signals
,
1496 .maxlen
= sizeof(int),
1498 .proc_handler
= proc_dointvec
1504 static struct ctl_table dev_table
[] = {
1508 static DEFINE_SPINLOCK(sysctl_lock
);
1510 /* called under sysctl_lock */
1511 static int use_table(struct ctl_table_header
*p
)
1513 if (unlikely(p
->unregistering
))
1519 /* called under sysctl_lock */
1520 static void unuse_table(struct ctl_table_header
*p
)
1523 if (unlikely(p
->unregistering
))
1524 complete(p
->unregistering
);
1527 /* called under sysctl_lock, will reacquire if has to wait */
1528 static void start_unregistering(struct ctl_table_header
*p
)
1531 * if p->used is 0, nobody will ever touch that entry again;
1532 * we'll eliminate all paths to it before dropping sysctl_lock
1534 if (unlikely(p
->used
)) {
1535 struct completion wait
;
1536 init_completion(&wait
);
1537 p
->unregistering
= &wait
;
1538 spin_unlock(&sysctl_lock
);
1539 wait_for_completion(&wait
);
1540 spin_lock(&sysctl_lock
);
1542 /* anything non-NULL; we'll never dereference it */
1543 p
->unregistering
= ERR_PTR(-EINVAL
);
1546 * do not remove from the list until nobody holds it; walking the
1547 * list in do_sysctl() relies on that.
1549 list_del_init(&p
->ctl_entry
);
1552 void sysctl_head_get(struct ctl_table_header
*head
)
1554 spin_lock(&sysctl_lock
);
1556 spin_unlock(&sysctl_lock
);
1559 void sysctl_head_put(struct ctl_table_header
*head
)
1561 spin_lock(&sysctl_lock
);
1564 spin_unlock(&sysctl_lock
);
1567 struct ctl_table_header
*sysctl_head_grab(struct ctl_table_header
*head
)
1571 spin_lock(&sysctl_lock
);
1572 if (!use_table(head
))
1573 head
= ERR_PTR(-ENOENT
);
1574 spin_unlock(&sysctl_lock
);
1578 void sysctl_head_finish(struct ctl_table_header
*head
)
1582 spin_lock(&sysctl_lock
);
1584 spin_unlock(&sysctl_lock
);
1587 static struct ctl_table_set
*
1588 lookup_header_set(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1590 struct ctl_table_set
*set
= &root
->default_set
;
1592 set
= root
->lookup(root
, namespaces
);
1596 static struct list_head
*
1597 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1599 struct ctl_table_set
*set
= lookup_header_set(root
, namespaces
);
1603 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1604 struct ctl_table_header
*prev
)
1606 struct ctl_table_root
*root
;
1607 struct list_head
*header_list
;
1608 struct ctl_table_header
*head
;
1609 struct list_head
*tmp
;
1611 spin_lock(&sysctl_lock
);
1614 tmp
= &prev
->ctl_entry
;
1618 tmp
= &root_table_header
.ctl_entry
;
1620 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1622 if (!use_table(head
))
1624 spin_unlock(&sysctl_lock
);
1629 header_list
= lookup_header_list(root
, namespaces
);
1630 if (tmp
!= header_list
)
1634 root
= list_entry(root
->root_list
.next
,
1635 struct ctl_table_root
, root_list
);
1636 if (root
== &sysctl_table_root
)
1638 header_list
= lookup_header_list(root
, namespaces
);
1639 } while (list_empty(header_list
));
1640 tmp
= header_list
->next
;
1643 spin_unlock(&sysctl_lock
);
1647 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1649 return __sysctl_head_next(current
->nsproxy
, prev
);
1652 void register_sysctl_root(struct ctl_table_root
*root
)
1654 spin_lock(&sysctl_lock
);
1655 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1656 spin_unlock(&sysctl_lock
);
1659 #ifdef CONFIG_SYSCTL_SYSCALL
1660 /* Perform the actual read/write of a sysctl table entry. */
1661 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1662 struct ctl_table
*table
,
1663 void __user
*oldval
, size_t __user
*oldlenp
,
1664 void __user
*newval
, size_t newlen
)
1672 if (sysctl_perm(root
, table
, op
))
1675 if (table
->strategy
) {
1676 rc
= table
->strategy(table
, oldval
, oldlenp
, newval
, newlen
);
1683 /* If there is no strategy routine, or if the strategy returns
1684 * zero, proceed with automatic r/w */
1685 if (table
->data
&& table
->maxlen
) {
1686 rc
= sysctl_data(table
, oldval
, oldlenp
, newval
, newlen
);
1693 static int parse_table(int __user
*name
, int nlen
,
1694 void __user
*oldval
, size_t __user
*oldlenp
,
1695 void __user
*newval
, size_t newlen
,
1696 struct ctl_table_root
*root
,
1697 struct ctl_table
*table
)
1703 if (get_user(n
, name
))
1705 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1706 if (!table
->ctl_name
)
1708 if (n
== table
->ctl_name
) {
1711 if (sysctl_perm(root
, table
, MAY_EXEC
))
1715 table
= table
->child
;
1718 error
= do_sysctl_strategy(root
, table
,
1727 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1728 void __user
*newval
, size_t newlen
)
1730 struct ctl_table_header
*head
;
1731 int error
= -ENOTDIR
;
1733 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1737 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1741 for (head
= sysctl_head_next(NULL
); head
;
1742 head
= sysctl_head_next(head
)) {
1743 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1745 head
->root
, head
->ctl_table
);
1746 if (error
!= -ENOTDIR
) {
1747 sysctl_head_finish(head
);
1754 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
1756 struct __sysctl_args tmp
;
1759 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1762 error
= deprecated_sysctl_warning(&tmp
);
1767 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1768 tmp
.newval
, tmp
.newlen
);
1773 #endif /* CONFIG_SYSCTL_SYSCALL */
1776 * sysctl_perm does NOT grant the superuser all rights automatically, because
1777 * some sysctl variables are readonly even to root.
1780 static int test_perm(int mode
, int op
)
1782 if (!current_euid())
1784 else if (in_egroup_p(0))
1786 if ((op
& ~mode
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
)) == 0)
1791 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1796 error
= security_sysctl(table
, op
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
));
1800 if (root
->permissions
)
1801 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1805 return test_perm(mode
, op
);
1808 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1810 for (; table
->ctl_name
|| table
->procname
; table
++) {
1811 table
->parent
= parent
;
1813 sysctl_set_parent(table
, table
->child
);
1817 static __init
int sysctl_init(void)
1819 sysctl_set_parent(NULL
, root_table
);
1820 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1823 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1829 core_initcall(sysctl_init
);
1831 static struct ctl_table
*is_branch_in(struct ctl_table
*branch
,
1832 struct ctl_table
*table
)
1834 struct ctl_table
*p
;
1835 const char *s
= branch
->procname
;
1837 /* branch should have named subdirectory as its first element */
1838 if (!s
|| !branch
->child
)
1841 /* ... and nothing else */
1842 if (branch
[1].procname
|| branch
[1].ctl_name
)
1845 /* table should contain subdirectory with the same name */
1846 for (p
= table
; p
->procname
|| p
->ctl_name
; p
++) {
1849 if (p
->procname
&& strcmp(p
->procname
, s
) == 0)
1855 /* see if attaching q to p would be an improvement */
1856 static void try_attach(struct ctl_table_header
*p
, struct ctl_table_header
*q
)
1858 struct ctl_table
*to
= p
->ctl_table
, *by
= q
->ctl_table
;
1859 struct ctl_table
*next
;
1861 int not_in_parent
= !p
->attached_by
;
1863 while ((next
= is_branch_in(by
, to
)) != NULL
) {
1864 if (by
== q
->attached_by
)
1866 if (to
== p
->attached_by
)
1872 if (is_better
&& not_in_parent
) {
1873 q
->attached_by
= by
;
1874 q
->attached_to
= to
;
1880 * __register_sysctl_paths - register a sysctl hierarchy
1881 * @root: List of sysctl headers to register on
1882 * @namespaces: Data to compute which lists of sysctl entries are visible
1883 * @path: The path to the directory the sysctl table is in.
1884 * @table: the top-level table structure
1886 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1887 * array. A completely 0 filled entry terminates the table.
1889 * The members of the &struct ctl_table structure are used as follows:
1891 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1892 * must be unique within that level of sysctl
1894 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1895 * enter a sysctl file
1897 * data - a pointer to data for use by proc_handler
1899 * maxlen - the maximum size in bytes of the data
1901 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1903 * child - a pointer to the child sysctl table if this entry is a directory, or
1906 * proc_handler - the text handler routine (described below)
1908 * strategy - the strategy routine (described below)
1910 * de - for internal use by the sysctl routines
1912 * extra1, extra2 - extra pointers usable by the proc handler routines
1914 * Leaf nodes in the sysctl tree will be represented by a single file
1915 * under /proc; non-leaf nodes will be represented by directories.
1917 * sysctl(2) can automatically manage read and write requests through
1918 * the sysctl table. The data and maxlen fields of the ctl_table
1919 * struct enable minimal validation of the values being written to be
1920 * performed, and the mode field allows minimal authentication.
1922 * More sophisticated management can be enabled by the provision of a
1923 * strategy routine with the table entry. This will be called before
1924 * any automatic read or write of the data is performed.
1926 * The strategy routine may return
1928 * < 0 - Error occurred (error is passed to user process)
1930 * 0 - OK - proceed with automatic read or write.
1932 * > 0 - OK - read or write has been done by the strategy routine, so
1933 * return immediately.
1935 * There must be a proc_handler routine for any terminal nodes
1936 * mirrored under /proc/sys (non-terminals are handled by a built-in
1937 * directory handler). Several default handlers are available to
1938 * cover common cases -
1940 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1941 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1942 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1944 * It is the handler's job to read the input buffer from user memory
1945 * and process it. The handler should return 0 on success.
1947 * This routine returns %NULL on a failure to register, and a pointer
1948 * to the table header on success.
1950 struct ctl_table_header
*__register_sysctl_paths(
1951 struct ctl_table_root
*root
,
1952 struct nsproxy
*namespaces
,
1953 const struct ctl_path
*path
, struct ctl_table
*table
)
1955 struct ctl_table_header
*header
;
1956 struct ctl_table
*new, **prevp
;
1957 unsigned int n
, npath
;
1958 struct ctl_table_set
*set
;
1960 /* Count the path components */
1961 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1965 * For each path component, allocate a 2-element ctl_table array.
1966 * The first array element will be filled with the sysctl entry
1967 * for this, the second will be the sentinel (ctl_name == 0).
1969 * We allocate everything in one go so that we don't have to
1970 * worry about freeing additional memory in unregister_sysctl_table.
1972 header
= kzalloc(sizeof(struct ctl_table_header
) +
1973 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1977 new = (struct ctl_table
*) (header
+ 1);
1979 /* Now connect the dots */
1980 prevp
= &header
->ctl_table
;
1981 for (n
= 0; n
< npath
; ++n
, ++path
) {
1982 /* Copy the procname */
1983 new->procname
= path
->procname
;
1984 new->ctl_name
= path
->ctl_name
;
1988 prevp
= &new->child
;
1993 header
->ctl_table_arg
= table
;
1995 INIT_LIST_HEAD(&header
->ctl_entry
);
1997 header
->unregistering
= NULL
;
1998 header
->root
= root
;
1999 sysctl_set_parent(NULL
, header
->ctl_table
);
2001 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2002 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
2007 spin_lock(&sysctl_lock
);
2008 header
->set
= lookup_header_set(root
, namespaces
);
2009 header
->attached_by
= header
->ctl_table
;
2010 header
->attached_to
= root_table
;
2011 header
->parent
= &root_table_header
;
2012 for (set
= header
->set
; set
; set
= set
->parent
) {
2013 struct ctl_table_header
*p
;
2014 list_for_each_entry(p
, &set
->list
, ctl_entry
) {
2015 if (p
->unregistering
)
2017 try_attach(p
, header
);
2020 header
->parent
->count
++;
2021 list_add_tail(&header
->ctl_entry
, &header
->set
->list
);
2022 spin_unlock(&sysctl_lock
);
2028 * register_sysctl_table_path - register a sysctl table hierarchy
2029 * @path: The path to the directory the sysctl table is in.
2030 * @table: the top-level table structure
2032 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2033 * array. A completely 0 filled entry terminates the table.
2035 * See __register_sysctl_paths for more details.
2037 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2038 struct ctl_table
*table
)
2040 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
2045 * register_sysctl_table - register a sysctl table hierarchy
2046 * @table: the top-level table structure
2048 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2049 * array. A completely 0 filled entry terminates the table.
2051 * See register_sysctl_paths for more details.
2053 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
2055 static const struct ctl_path null_path
[] = { {} };
2057 return register_sysctl_paths(null_path
, table
);
2061 * unregister_sysctl_table - unregister a sysctl table hierarchy
2062 * @header: the header returned from register_sysctl_table
2064 * Unregisters the sysctl table and all children. proc entries may not
2065 * actually be removed until they are no longer used by anyone.
2067 void unregister_sysctl_table(struct ctl_table_header
* header
)
2074 spin_lock(&sysctl_lock
);
2075 start_unregistering(header
);
2076 if (!--header
->parent
->count
) {
2078 kfree(header
->parent
);
2080 if (!--header
->count
)
2082 spin_unlock(&sysctl_lock
);
2085 int sysctl_is_seen(struct ctl_table_header
*p
)
2087 struct ctl_table_set
*set
= p
->set
;
2089 spin_lock(&sysctl_lock
);
2090 if (p
->unregistering
)
2092 else if (!set
->is_seen
)
2095 res
= set
->is_seen(set
);
2096 spin_unlock(&sysctl_lock
);
2100 void setup_sysctl_set(struct ctl_table_set
*p
,
2101 struct ctl_table_set
*parent
,
2102 int (*is_seen
)(struct ctl_table_set
*))
2104 INIT_LIST_HEAD(&p
->list
);
2105 p
->parent
= parent
? parent
: &sysctl_table_root
.default_set
;
2106 p
->is_seen
= is_seen
;
2109 #else /* !CONFIG_SYSCTL */
2110 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
2115 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2116 struct ctl_table
*table
)
2121 void unregister_sysctl_table(struct ctl_table_header
* table
)
2125 void setup_sysctl_set(struct ctl_table_set
*p
,
2126 struct ctl_table_set
*parent
,
2127 int (*is_seen
)(struct ctl_table_set
*))
2131 void sysctl_head_put(struct ctl_table_header
*head
)
2135 #endif /* CONFIG_SYSCTL */
2141 #ifdef CONFIG_PROC_SYSCTL
2143 static int _proc_do_string(void* data
, int maxlen
, int write
,
2144 struct file
*filp
, void __user
*buffer
,
2145 size_t *lenp
, loff_t
*ppos
)
2151 if (!data
|| !maxlen
|| !*lenp
) {
2159 while (len
< *lenp
) {
2160 if (get_user(c
, p
++))
2162 if (c
== 0 || c
== '\n')
2168 if(copy_from_user(data
, buffer
, len
))
2170 ((char *) data
)[len
] = 0;
2188 if(copy_to_user(buffer
, data
, len
))
2191 if(put_user('\n', ((char __user
*) buffer
) + len
))
2202 * proc_dostring - read a string sysctl
2203 * @table: the sysctl table
2204 * @write: %TRUE if this is a write to the sysctl file
2205 * @filp: the file structure
2206 * @buffer: the user buffer
2207 * @lenp: the size of the user buffer
2208 * @ppos: file position
2210 * Reads/writes a string from/to the user buffer. If the kernel
2211 * buffer provided is not large enough to hold the string, the
2212 * string is truncated. The copied string is %NULL-terminated.
2213 * If the string is being read by the user process, it is copied
2214 * and a newline '\n' is added. It is truncated if the buffer is
2217 * Returns 0 on success.
2219 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2220 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2222 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
2223 buffer
, lenp
, ppos
);
2227 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
2229 int write
, void *data
)
2232 *valp
= *negp
? -*lvalp
: *lvalp
;
2237 *lvalp
= (unsigned long)-val
;
2240 *lvalp
= (unsigned long)val
;
2246 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2247 int write
, struct file
*filp
, void __user
*buffer
,
2248 size_t *lenp
, loff_t
*ppos
,
2249 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2250 int write
, void *data
),
2253 #define TMPBUFLEN 21
2254 int *i
, vleft
, first
=1, neg
, val
;
2258 char buf
[TMPBUFLEN
], *p
;
2259 char __user
*s
= buffer
;
2261 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
2262 (*ppos
&& !write
)) {
2267 i
= (int *) tbl_data
;
2268 vleft
= table
->maxlen
/ sizeof(*i
);
2272 conv
= do_proc_dointvec_conv
;
2274 for (; left
&& vleft
--; i
++, first
=0) {
2289 if (len
> sizeof(buf
) - 1)
2290 len
= sizeof(buf
) - 1;
2291 if (copy_from_user(buf
, s
, len
))
2295 if (*p
== '-' && left
> 1) {
2299 if (*p
< '0' || *p
> '9')
2302 lval
= simple_strtoul(p
, &p
, 0);
2305 if ((len
< left
) && *p
&& !isspace(*p
))
2312 if (conv(&neg
, &lval
, i
, 1, data
))
2319 if (conv(&neg
, &lval
, i
, 0, data
))
2322 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2326 if(copy_to_user(s
, buf
, len
))
2333 if (!write
&& !first
&& left
) {
2334 if(put_user('\n', s
))
2341 if (get_user(c
, s
++))
2356 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2357 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2358 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2359 int write
, void *data
),
2362 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2363 buffer
, lenp
, ppos
, conv
, data
);
2367 * proc_dointvec - read a vector of integers
2368 * @table: the sysctl table
2369 * @write: %TRUE if this is a write to the sysctl file
2370 * @filp: the file structure
2371 * @buffer: the user buffer
2372 * @lenp: the size of the user buffer
2373 * @ppos: file position
2375 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2376 * values from/to the user buffer, treated as an ASCII string.
2378 * Returns 0 on success.
2380 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2381 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2383 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2388 * Taint values can only be increased
2389 * This means we can safely use a temporary.
2391 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2392 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2395 unsigned long tmptaint
= get_taint();
2398 if (write
&& !capable(CAP_SYS_ADMIN
))
2403 err
= proc_doulongvec_minmax(&t
, write
, filp
, buffer
, lenp
, ppos
);
2409 * Poor man's atomic or. Not worth adding a primitive
2410 * to everyone's atomic.h for this
2413 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2414 if ((tmptaint
>> i
) & 1)
2422 struct do_proc_dointvec_minmax_conv_param
{
2427 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2429 int write
, void *data
)
2431 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2433 int val
= *negp
? -*lvalp
: *lvalp
;
2434 if ((param
->min
&& *param
->min
> val
) ||
2435 (param
->max
&& *param
->max
< val
))
2442 *lvalp
= (unsigned long)-val
;
2445 *lvalp
= (unsigned long)val
;
2452 * proc_dointvec_minmax - read a vector of integers with min/max values
2453 * @table: the sysctl table
2454 * @write: %TRUE if this is a write to the sysctl file
2455 * @filp: the file structure
2456 * @buffer: the user buffer
2457 * @lenp: the size of the user buffer
2458 * @ppos: file position
2460 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2461 * values from/to the user buffer, treated as an ASCII string.
2463 * This routine will ensure the values are within the range specified by
2464 * table->extra1 (min) and table->extra2 (max).
2466 * Returns 0 on success.
2468 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2469 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2471 struct do_proc_dointvec_minmax_conv_param param
= {
2472 .min
= (int *) table
->extra1
,
2473 .max
= (int *) table
->extra2
,
2475 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2476 do_proc_dointvec_minmax_conv
, ¶m
);
2479 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2481 void __user
*buffer
,
2482 size_t *lenp
, loff_t
*ppos
,
2483 unsigned long convmul
,
2484 unsigned long convdiv
)
2486 #define TMPBUFLEN 21
2487 unsigned long *i
, *min
, *max
, val
;
2488 int vleft
, first
=1, neg
;
2490 char buf
[TMPBUFLEN
], *p
;
2491 char __user
*s
= buffer
;
2493 if (!data
|| !table
->maxlen
|| !*lenp
||
2494 (*ppos
&& !write
)) {
2499 i
= (unsigned long *) data
;
2500 min
= (unsigned long *) table
->extra1
;
2501 max
= (unsigned long *) table
->extra2
;
2502 vleft
= table
->maxlen
/ sizeof(unsigned long);
2505 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2520 if (len
> TMPBUFLEN
-1)
2522 if (copy_from_user(buf
, s
, len
))
2526 if (*p
== '-' && left
> 1) {
2530 if (*p
< '0' || *p
> '9')
2532 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2534 if ((len
< left
) && *p
&& !isspace(*p
))
2543 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2550 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2554 if(copy_to_user(s
, buf
, len
))
2561 if (!write
&& !first
&& left
) {
2562 if(put_user('\n', s
))
2569 if (get_user(c
, s
++))
2584 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2586 void __user
*buffer
,
2587 size_t *lenp
, loff_t
*ppos
,
2588 unsigned long convmul
,
2589 unsigned long convdiv
)
2591 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2592 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2596 * proc_doulongvec_minmax - read a vector of long integers 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.
2607 * This routine will ensure the values are within the range specified by
2608 * table->extra1 (min) and table->extra2 (max).
2610 * Returns 0 on success.
2612 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2613 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2615 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2619 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2620 * @table: the sysctl table
2621 * @write: %TRUE if this is a write to the sysctl file
2622 * @filp: the file structure
2623 * @buffer: the user buffer
2624 * @lenp: the size of the user buffer
2625 * @ppos: file position
2627 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2628 * values from/to the user buffer, treated as an ASCII string. The values
2629 * are treated as milliseconds, and converted to jiffies when they are stored.
2631 * This routine will ensure the values are within the range specified by
2632 * table->extra1 (min) and table->extra2 (max).
2634 * Returns 0 on success.
2636 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2638 void __user
*buffer
,
2639 size_t *lenp
, loff_t
*ppos
)
2641 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2642 lenp
, ppos
, HZ
, 1000l);
2646 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2648 int write
, void *data
)
2651 if (*lvalp
> LONG_MAX
/ HZ
)
2653 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2659 lval
= (unsigned long)-val
;
2662 lval
= (unsigned long)val
;
2669 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2671 int write
, void *data
)
2674 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2676 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2682 lval
= (unsigned long)-val
;
2685 lval
= (unsigned long)val
;
2687 *lvalp
= jiffies_to_clock_t(lval
);
2692 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2694 int write
, void *data
)
2697 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2703 lval
= (unsigned long)-val
;
2706 lval
= (unsigned long)val
;
2708 *lvalp
= jiffies_to_msecs(lval
);
2714 * proc_dointvec_jiffies - read a vector of integers as 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: 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 seconds, and are converted into
2727 * Returns 0 on success.
2729 int proc_dointvec_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_jiffies_conv
,NULL
);
2737 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
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: pointer to the file position
2745 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2746 * values from/to the user buffer, treated as an ASCII string.
2747 * The values read are assumed to be in 1/USER_HZ seconds, and
2748 * are converted into jiffies.
2750 * Returns 0 on success.
2752 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2753 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2755 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2756 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2760 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2761 * @table: the sysctl table
2762 * @write: %TRUE if this is a write to the sysctl file
2763 * @filp: the file structure
2764 * @buffer: the user buffer
2765 * @lenp: the size of the user buffer
2766 * @ppos: file position
2767 * @ppos: the current position in the file
2769 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2770 * values from/to the user buffer, treated as an ASCII string.
2771 * The values read are assumed to be in 1/1000 seconds, and
2772 * are converted into jiffies.
2774 * Returns 0 on success.
2776 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2777 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2779 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2780 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2783 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2784 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2786 struct pid
*new_pid
;
2790 tmp
= pid_vnr(cad_pid
);
2792 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2793 lenp
, ppos
, NULL
, NULL
);
2797 new_pid
= find_get_pid(tmp
);
2801 put_pid(xchg(&cad_pid
, new_pid
));
2805 #else /* CONFIG_PROC_FS */
2807 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2808 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2813 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2814 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2819 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2820 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2825 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2826 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2831 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2832 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2837 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2838 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2843 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2844 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2849 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2851 void __user
*buffer
,
2852 size_t *lenp
, loff_t
*ppos
)
2858 #endif /* CONFIG_PROC_FS */
2861 #ifdef CONFIG_SYSCTL_SYSCALL
2863 * General sysctl support routines
2866 /* The generic sysctl data routine (used if no strategy routine supplied) */
2867 int sysctl_data(struct ctl_table
*table
,
2868 void __user
*oldval
, size_t __user
*oldlenp
,
2869 void __user
*newval
, size_t newlen
)
2873 /* Get out of I don't have a variable */
2874 if (!table
->data
|| !table
->maxlen
)
2877 if (oldval
&& oldlenp
) {
2878 if (get_user(len
, oldlenp
))
2881 if (len
> table
->maxlen
)
2882 len
= table
->maxlen
;
2883 if (copy_to_user(oldval
, table
->data
, len
))
2885 if (put_user(len
, oldlenp
))
2890 if (newval
&& newlen
) {
2891 if (newlen
> table
->maxlen
)
2892 newlen
= table
->maxlen
;
2894 if (copy_from_user(table
->data
, newval
, newlen
))
2900 /* The generic string strategy routine: */
2901 int sysctl_string(struct ctl_table
*table
,
2902 void __user
*oldval
, size_t __user
*oldlenp
,
2903 void __user
*newval
, size_t newlen
)
2905 if (!table
->data
|| !table
->maxlen
)
2908 if (oldval
&& oldlenp
) {
2910 if (get_user(bufsize
, oldlenp
))
2913 size_t len
= strlen(table
->data
), copied
;
2915 /* This shouldn't trigger for a well-formed sysctl */
2916 if (len
> table
->maxlen
)
2917 len
= table
->maxlen
;
2919 /* Copy up to a max of bufsize-1 bytes of the string */
2920 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2922 if (copy_to_user(oldval
, table
->data
, copied
) ||
2923 put_user(0, (char __user
*)(oldval
+ copied
)))
2925 if (put_user(len
, oldlenp
))
2929 if (newval
&& newlen
) {
2930 size_t len
= newlen
;
2931 if (len
> table
->maxlen
)
2932 len
= table
->maxlen
;
2933 if(copy_from_user(table
->data
, newval
, len
))
2935 if (len
== table
->maxlen
)
2937 ((char *) table
->data
)[len
] = 0;
2943 * This function makes sure that all of the integers in the vector
2944 * are between the minimum and maximum values given in the arrays
2945 * table->extra1 and table->extra2, respectively.
2947 int sysctl_intvec(struct ctl_table
*table
,
2948 void __user
*oldval
, size_t __user
*oldlenp
,
2949 void __user
*newval
, size_t newlen
)
2952 if (newval
&& newlen
) {
2953 int __user
*vec
= (int __user
*) newval
;
2954 int *min
= (int *) table
->extra1
;
2955 int *max
= (int *) table
->extra2
;
2959 if (newlen
% sizeof(int) != 0)
2962 if (!table
->extra1
&& !table
->extra2
)
2965 if (newlen
> table
->maxlen
)
2966 newlen
= table
->maxlen
;
2967 length
= newlen
/ sizeof(int);
2969 for (i
= 0; i
< length
; i
++) {
2971 if (get_user(value
, vec
+ i
))
2973 if (min
&& value
< min
[i
])
2975 if (max
&& value
> max
[i
])
2982 /* Strategy function to convert jiffies to seconds */
2983 int sysctl_jiffies(struct ctl_table
*table
,
2984 void __user
*oldval
, size_t __user
*oldlenp
,
2985 void __user
*newval
, size_t newlen
)
2987 if (oldval
&& oldlenp
) {
2990 if (get_user(olen
, oldlenp
))
2995 if (olen
< sizeof(int))
2998 val
= *(int *)(table
->data
) / HZ
;
2999 if (put_user(val
, (int __user
*)oldval
))
3001 if (put_user(sizeof(int), oldlenp
))
3005 if (newval
&& newlen
) {
3007 if (newlen
!= sizeof(int))
3009 if (get_user(new, (int __user
*)newval
))
3011 *(int *)(table
->data
) = new*HZ
;
3016 /* Strategy function to convert jiffies to seconds */
3017 int sysctl_ms_jiffies(struct ctl_table
*table
,
3018 void __user
*oldval
, size_t __user
*oldlenp
,
3019 void __user
*newval
, size_t newlen
)
3021 if (oldval
&& oldlenp
) {
3024 if (get_user(olen
, oldlenp
))
3029 if (olen
< sizeof(int))
3032 val
= jiffies_to_msecs(*(int *)(table
->data
));
3033 if (put_user(val
, (int __user
*)oldval
))
3035 if (put_user(sizeof(int), oldlenp
))
3039 if (newval
&& newlen
) {
3041 if (newlen
!= sizeof(int))
3043 if (get_user(new, (int __user
*)newval
))
3045 *(int *)(table
->data
) = msecs_to_jiffies(new);
3052 #else /* CONFIG_SYSCTL_SYSCALL */
3055 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
3057 struct __sysctl_args tmp
;
3060 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
3063 error
= deprecated_sysctl_warning(&tmp
);
3065 /* If no error reading the parameters then just -ENOSYS ... */
3072 int sysctl_data(struct ctl_table
*table
,
3073 void __user
*oldval
, size_t __user
*oldlenp
,
3074 void __user
*newval
, size_t newlen
)
3079 int sysctl_string(struct ctl_table
*table
,
3080 void __user
*oldval
, size_t __user
*oldlenp
,
3081 void __user
*newval
, size_t newlen
)
3086 int sysctl_intvec(struct ctl_table
*table
,
3087 void __user
*oldval
, size_t __user
*oldlenp
,
3088 void __user
*newval
, size_t newlen
)
3093 int sysctl_jiffies(struct ctl_table
*table
,
3094 void __user
*oldval
, size_t __user
*oldlenp
,
3095 void __user
*newval
, size_t newlen
)
3100 int sysctl_ms_jiffies(struct ctl_table
*table
,
3101 void __user
*oldval
, size_t __user
*oldlenp
,
3102 void __user
*newval
, size_t newlen
)
3107 #endif /* CONFIG_SYSCTL_SYSCALL */
3109 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
3111 static int msg_count
;
3112 int name
[CTL_MAXNAME
];
3115 /* Check args->nlen. */
3116 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
3119 /* Read in the sysctl name for better debug message logging */
3120 for (i
= 0; i
< args
->nlen
; i
++)
3121 if (get_user(name
[i
], args
->name
+ i
))
3124 /* Ignore accesses to kernel.version */
3125 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
3128 if (msg_count
< 5) {
3131 "warning: process `%s' used the deprecated sysctl "
3132 "system call with ", current
->comm
);
3133 for (i
= 0; i
< args
->nlen
; i
++)
3134 printk("%d.", name
[i
]);
3141 * No sense putting this after each symbol definition, twice,
3142 * exception granted :-)
3144 EXPORT_SYMBOL(proc_dointvec
);
3145 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3146 EXPORT_SYMBOL(proc_dointvec_minmax
);
3147 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3148 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3149 EXPORT_SYMBOL(proc_dostring
);
3150 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3151 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3152 EXPORT_SYMBOL(register_sysctl_table
);
3153 EXPORT_SYMBOL(register_sysctl_paths
);
3154 EXPORT_SYMBOL(sysctl_intvec
);
3155 EXPORT_SYMBOL(sysctl_jiffies
);
3156 EXPORT_SYMBOL(sysctl_ms_jiffies
);
3157 EXPORT_SYMBOL(sysctl_string
);
3158 EXPORT_SYMBOL(sysctl_data
);
3159 EXPORT_SYMBOL(unregister_sysctl_table
);