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/kmemcheck.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_event.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
[];
79 extern unsigned int core_pipe_limit
;
81 extern int min_free_kbytes
;
82 extern int pid_max_min
, pid_max_max
;
83 extern int sysctl_drop_caches
;
84 extern int percpu_pagelist_fraction
;
85 extern int compat_log
;
86 extern int latencytop_enabled
;
87 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
89 extern int sysctl_nr_trim_pages
;
91 #ifdef CONFIG_RCU_TORTURE_TEST
92 extern int rcutorture_runnable
;
93 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
95 extern int blk_iopoll_enabled
;
98 /* Constants used for minimum and maximum */
99 #ifdef CONFIG_DETECT_SOFTLOCKUP
100 static int sixty
= 60;
101 static int neg_one
= -1;
105 static int __maybe_unused one
= 1;
106 static int __maybe_unused two
= 2;
107 static unsigned long one_ul
= 1;
108 static int one_hundred
= 100;
110 static int ten_thousand
= 10000;
113 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
114 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
116 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
117 static int maxolduid
= 65535;
118 static int minolduid
;
119 static int min_percpu_pagelist_fract
= 8;
121 static int ngroups_max
= NGROUPS_MAX
;
123 #ifdef CONFIG_MODULES
124 extern char modprobe_path
[];
125 extern int modules_disabled
;
127 #ifdef CONFIG_CHR_DEV_SG
128 extern int sg_big_buff
;
132 #include <asm/system.h>
135 #ifdef CONFIG_SPARC64
136 extern int sysctl_tsb_ratio
;
140 extern int pwrsw_enabled
;
141 extern int unaligned_enabled
;
145 #ifdef CONFIG_MATHEMU
146 extern int sysctl_ieee_emulation_warnings
;
148 extern int sysctl_userprocess_debug
;
149 extern int spin_retry
;
152 #ifdef CONFIG_BSD_PROCESS_ACCT
153 extern int acct_parm
[];
157 extern int no_unaligned_warning
;
158 extern int unaligned_dump_stack
;
161 #ifdef CONFIG_RT_MUTEXES
162 extern int max_lock_depth
;
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
167 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
168 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
169 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
172 static struct ctl_table root_table
[];
173 static struct ctl_table_root sysctl_table_root
;
174 static struct ctl_table_header root_table_header
= {
176 .ctl_table
= root_table
,
177 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.default_set
.list
),
178 .root
= &sysctl_table_root
,
179 .set
= &sysctl_table_root
.default_set
,
181 static struct ctl_table_root sysctl_table_root
= {
182 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
183 .default_set
.list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
186 static struct ctl_table kern_table
[];
187 static struct ctl_table vm_table
[];
188 static struct ctl_table fs_table
[];
189 static struct ctl_table debug_table
[];
190 static struct ctl_table dev_table
[];
191 extern struct ctl_table random_table
[];
192 #ifdef CONFIG_INOTIFY_USER
193 extern struct ctl_table inotify_table
[];
196 extern struct ctl_table epoll_table
[];
199 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
200 int sysctl_legacy_va_layout
;
203 extern int prove_locking
;
204 extern int lock_stat
;
206 /* The default sysctl tables: */
208 static struct ctl_table root_table
[] = {
210 .ctl_name
= CTL_KERN
,
211 .procname
= "kernel",
228 .ctl_name
= CTL_DEBUG
,
231 .child
= debug_table
,
240 * NOTE: do not add new entries to this table unless you have read
241 * Documentation/sysctl/ctl_unnumbered.txt
246 #ifdef CONFIG_SCHED_DEBUG
247 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
248 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
249 static int min_wakeup_granularity_ns
; /* 0 usecs */
250 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
253 static struct ctl_table kern_table
[] = {
255 .ctl_name
= CTL_UNNUMBERED
,
256 .procname
= "sched_child_runs_first",
257 .data
= &sysctl_sched_child_runs_first
,
258 .maxlen
= sizeof(unsigned int),
260 .proc_handler
= &proc_dointvec
,
262 #ifdef CONFIG_SCHED_DEBUG
264 .ctl_name
= CTL_UNNUMBERED
,
265 .procname
= "sched_min_granularity_ns",
266 .data
= &sysctl_sched_min_granularity
,
267 .maxlen
= sizeof(unsigned int),
269 .proc_handler
= &sched_nr_latency_handler
,
270 .strategy
= &sysctl_intvec
,
271 .extra1
= &min_sched_granularity_ns
,
272 .extra2
= &max_sched_granularity_ns
,
275 .ctl_name
= CTL_UNNUMBERED
,
276 .procname
= "sched_latency_ns",
277 .data
= &sysctl_sched_latency
,
278 .maxlen
= sizeof(unsigned int),
280 .proc_handler
= &sched_nr_latency_handler
,
281 .strategy
= &sysctl_intvec
,
282 .extra1
= &min_sched_granularity_ns
,
283 .extra2
= &max_sched_granularity_ns
,
286 .ctl_name
= CTL_UNNUMBERED
,
287 .procname
= "sched_wakeup_granularity_ns",
288 .data
= &sysctl_sched_wakeup_granularity
,
289 .maxlen
= sizeof(unsigned int),
291 .proc_handler
= &proc_dointvec_minmax
,
292 .strategy
= &sysctl_intvec
,
293 .extra1
= &min_wakeup_granularity_ns
,
294 .extra2
= &max_wakeup_granularity_ns
,
297 .ctl_name
= CTL_UNNUMBERED
,
298 .procname
= "sched_shares_ratelimit",
299 .data
= &sysctl_sched_shares_ratelimit
,
300 .maxlen
= sizeof(unsigned int),
302 .proc_handler
= &proc_dointvec
,
305 .ctl_name
= CTL_UNNUMBERED
,
306 .procname
= "sched_shares_thresh",
307 .data
= &sysctl_sched_shares_thresh
,
308 .maxlen
= sizeof(unsigned int),
310 .proc_handler
= &proc_dointvec_minmax
,
311 .strategy
= &sysctl_intvec
,
315 .ctl_name
= CTL_UNNUMBERED
,
316 .procname
= "sched_features",
317 .data
= &sysctl_sched_features
,
318 .maxlen
= sizeof(unsigned int),
320 .proc_handler
= &proc_dointvec
,
323 .ctl_name
= CTL_UNNUMBERED
,
324 .procname
= "sched_migration_cost",
325 .data
= &sysctl_sched_migration_cost
,
326 .maxlen
= sizeof(unsigned int),
328 .proc_handler
= &proc_dointvec
,
331 .ctl_name
= CTL_UNNUMBERED
,
332 .procname
= "sched_nr_migrate",
333 .data
= &sysctl_sched_nr_migrate
,
334 .maxlen
= sizeof(unsigned int),
336 .proc_handler
= &proc_dointvec
,
339 .ctl_name
= CTL_UNNUMBERED
,
340 .procname
= "sched_time_avg",
341 .data
= &sysctl_sched_time_avg
,
342 .maxlen
= sizeof(unsigned int),
344 .proc_handler
= &proc_dointvec
,
347 .ctl_name
= CTL_UNNUMBERED
,
348 .procname
= "timer_migration",
349 .data
= &sysctl_timer_migration
,
350 .maxlen
= sizeof(unsigned int),
352 .proc_handler
= &proc_dointvec_minmax
,
353 .strategy
= &sysctl_intvec
,
359 .ctl_name
= CTL_UNNUMBERED
,
360 .procname
= "sched_rt_period_us",
361 .data
= &sysctl_sched_rt_period
,
362 .maxlen
= sizeof(unsigned int),
364 .proc_handler
= &sched_rt_handler
,
367 .ctl_name
= CTL_UNNUMBERED
,
368 .procname
= "sched_rt_runtime_us",
369 .data
= &sysctl_sched_rt_runtime
,
370 .maxlen
= sizeof(int),
372 .proc_handler
= &sched_rt_handler
,
375 .ctl_name
= CTL_UNNUMBERED
,
376 .procname
= "sched_compat_yield",
377 .data
= &sysctl_sched_compat_yield
,
378 .maxlen
= sizeof(unsigned int),
380 .proc_handler
= &proc_dointvec
,
382 #ifdef CONFIG_PROVE_LOCKING
384 .ctl_name
= CTL_UNNUMBERED
,
385 .procname
= "prove_locking",
386 .data
= &prove_locking
,
387 .maxlen
= sizeof(int),
389 .proc_handler
= &proc_dointvec
,
392 #ifdef CONFIG_LOCK_STAT
394 .ctl_name
= CTL_UNNUMBERED
,
395 .procname
= "lock_stat",
397 .maxlen
= sizeof(int),
399 .proc_handler
= &proc_dointvec
,
403 .ctl_name
= KERN_PANIC
,
405 .data
= &panic_timeout
,
406 .maxlen
= sizeof(int),
408 .proc_handler
= &proc_dointvec
,
411 .ctl_name
= KERN_CORE_USES_PID
,
412 .procname
= "core_uses_pid",
413 .data
= &core_uses_pid
,
414 .maxlen
= sizeof(int),
416 .proc_handler
= &proc_dointvec
,
419 .ctl_name
= KERN_CORE_PATTERN
,
420 .procname
= "core_pattern",
421 .data
= core_pattern
,
422 .maxlen
= CORENAME_MAX_SIZE
,
424 .proc_handler
= &proc_dostring
,
425 .strategy
= &sysctl_string
,
428 .ctl_name
= CTL_UNNUMBERED
,
429 .procname
= "core_pipe_limit",
430 .data
= &core_pipe_limit
,
431 .maxlen
= sizeof(unsigned int),
433 .proc_handler
= &proc_dointvec
,
435 #ifdef CONFIG_PROC_SYSCTL
437 .procname
= "tainted",
438 .maxlen
= sizeof(long),
440 .proc_handler
= &proc_taint
,
443 #ifdef CONFIG_LATENCYTOP
445 .procname
= "latencytop",
446 .data
= &latencytop_enabled
,
447 .maxlen
= sizeof(int),
449 .proc_handler
= &proc_dointvec
,
452 #ifdef CONFIG_BLK_DEV_INITRD
454 .ctl_name
= KERN_REALROOTDEV
,
455 .procname
= "real-root-dev",
456 .data
= &real_root_dev
,
457 .maxlen
= sizeof(int),
459 .proc_handler
= &proc_dointvec
,
463 .ctl_name
= CTL_UNNUMBERED
,
464 .procname
= "print-fatal-signals",
465 .data
= &print_fatal_signals
,
466 .maxlen
= sizeof(int),
468 .proc_handler
= &proc_dointvec
,
472 .ctl_name
= KERN_SPARC_REBOOT
,
473 .procname
= "reboot-cmd",
474 .data
= reboot_command
,
477 .proc_handler
= &proc_dostring
,
478 .strategy
= &sysctl_string
,
481 .ctl_name
= KERN_SPARC_STOP_A
,
482 .procname
= "stop-a",
483 .data
= &stop_a_enabled
,
484 .maxlen
= sizeof (int),
486 .proc_handler
= &proc_dointvec
,
489 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
490 .procname
= "scons-poweroff",
491 .data
= &scons_pwroff
,
492 .maxlen
= sizeof (int),
494 .proc_handler
= &proc_dointvec
,
497 #ifdef CONFIG_SPARC64
499 .ctl_name
= CTL_UNNUMBERED
,
500 .procname
= "tsb-ratio",
501 .data
= &sysctl_tsb_ratio
,
502 .maxlen
= sizeof (int),
504 .proc_handler
= &proc_dointvec
,
509 .ctl_name
= KERN_HPPA_PWRSW
,
510 .procname
= "soft-power",
511 .data
= &pwrsw_enabled
,
512 .maxlen
= sizeof (int),
514 .proc_handler
= &proc_dointvec
,
517 .ctl_name
= KERN_HPPA_UNALIGNED
,
518 .procname
= "unaligned-trap",
519 .data
= &unaligned_enabled
,
520 .maxlen
= sizeof (int),
522 .proc_handler
= &proc_dointvec
,
526 .ctl_name
= KERN_CTLALTDEL
,
527 .procname
= "ctrl-alt-del",
529 .maxlen
= sizeof(int),
531 .proc_handler
= &proc_dointvec
,
533 #ifdef CONFIG_FUNCTION_TRACER
535 .ctl_name
= CTL_UNNUMBERED
,
536 .procname
= "ftrace_enabled",
537 .data
= &ftrace_enabled
,
538 .maxlen
= sizeof(int),
540 .proc_handler
= &ftrace_enable_sysctl
,
543 #ifdef CONFIG_STACK_TRACER
545 .ctl_name
= CTL_UNNUMBERED
,
546 .procname
= "stack_tracer_enabled",
547 .data
= &stack_tracer_enabled
,
548 .maxlen
= sizeof(int),
550 .proc_handler
= &stack_trace_sysctl
,
553 #ifdef CONFIG_TRACING
555 .ctl_name
= CTL_UNNUMBERED
,
556 .procname
= "ftrace_dump_on_oops",
557 .data
= &ftrace_dump_on_oops
,
558 .maxlen
= sizeof(int),
560 .proc_handler
= &proc_dointvec
,
563 #ifdef CONFIG_MODULES
565 .ctl_name
= KERN_MODPROBE
,
566 .procname
= "modprobe",
567 .data
= &modprobe_path
,
568 .maxlen
= KMOD_PATH_LEN
,
570 .proc_handler
= &proc_dostring
,
571 .strategy
= &sysctl_string
,
574 .ctl_name
= CTL_UNNUMBERED
,
575 .procname
= "modules_disabled",
576 .data
= &modules_disabled
,
577 .maxlen
= sizeof(int),
579 /* only handle a transition from default "0" to "1" */
580 .proc_handler
= &proc_dointvec_minmax
,
585 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
587 .ctl_name
= KERN_HOTPLUG
,
588 .procname
= "hotplug",
589 .data
= &uevent_helper
,
590 .maxlen
= UEVENT_HELPER_PATH_LEN
,
592 .proc_handler
= &proc_dostring
,
593 .strategy
= &sysctl_string
,
596 #ifdef CONFIG_CHR_DEV_SG
598 .ctl_name
= KERN_SG_BIG_BUFF
,
599 .procname
= "sg-big-buff",
600 .data
= &sg_big_buff
,
601 .maxlen
= sizeof (int),
603 .proc_handler
= &proc_dointvec
,
606 #ifdef CONFIG_BSD_PROCESS_ACCT
608 .ctl_name
= KERN_ACCT
,
611 .maxlen
= 3*sizeof(int),
613 .proc_handler
= &proc_dointvec
,
616 #ifdef CONFIG_MAGIC_SYSRQ
618 .ctl_name
= KERN_SYSRQ
,
620 .data
= &__sysrq_enabled
,
621 .maxlen
= sizeof (int),
623 .proc_handler
= &proc_dointvec
,
626 #ifdef CONFIG_PROC_SYSCTL
628 .procname
= "cad_pid",
630 .maxlen
= sizeof (int),
632 .proc_handler
= &proc_do_cad_pid
,
636 .ctl_name
= KERN_MAX_THREADS
,
637 .procname
= "threads-max",
638 .data
= &max_threads
,
639 .maxlen
= sizeof(int),
641 .proc_handler
= &proc_dointvec
,
644 .ctl_name
= KERN_RANDOM
,
645 .procname
= "random",
647 .child
= random_table
,
650 .ctl_name
= KERN_OVERFLOWUID
,
651 .procname
= "overflowuid",
652 .data
= &overflowuid
,
653 .maxlen
= sizeof(int),
655 .proc_handler
= &proc_dointvec_minmax
,
656 .strategy
= &sysctl_intvec
,
657 .extra1
= &minolduid
,
658 .extra2
= &maxolduid
,
661 .ctl_name
= KERN_OVERFLOWGID
,
662 .procname
= "overflowgid",
663 .data
= &overflowgid
,
664 .maxlen
= sizeof(int),
666 .proc_handler
= &proc_dointvec_minmax
,
667 .strategy
= &sysctl_intvec
,
668 .extra1
= &minolduid
,
669 .extra2
= &maxolduid
,
672 #ifdef CONFIG_MATHEMU
674 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
675 .procname
= "ieee_emulation_warnings",
676 .data
= &sysctl_ieee_emulation_warnings
,
677 .maxlen
= sizeof(int),
679 .proc_handler
= &proc_dointvec
,
683 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
684 .procname
= "userprocess_debug",
685 .data
= &sysctl_userprocess_debug
,
686 .maxlen
= sizeof(int),
688 .proc_handler
= &proc_dointvec
,
692 .ctl_name
= KERN_PIDMAX
,
693 .procname
= "pid_max",
695 .maxlen
= sizeof (int),
697 .proc_handler
= &proc_dointvec_minmax
,
698 .strategy
= sysctl_intvec
,
699 .extra1
= &pid_max_min
,
700 .extra2
= &pid_max_max
,
703 .ctl_name
= KERN_PANIC_ON_OOPS
,
704 .procname
= "panic_on_oops",
705 .data
= &panic_on_oops
,
706 .maxlen
= sizeof(int),
708 .proc_handler
= &proc_dointvec
,
710 #if defined CONFIG_PRINTK
712 .ctl_name
= KERN_PRINTK
,
713 .procname
= "printk",
714 .data
= &console_loglevel
,
715 .maxlen
= 4*sizeof(int),
717 .proc_handler
= &proc_dointvec
,
720 .ctl_name
= KERN_PRINTK_RATELIMIT
,
721 .procname
= "printk_ratelimit",
722 .data
= &printk_ratelimit_state
.interval
,
723 .maxlen
= sizeof(int),
725 .proc_handler
= &proc_dointvec_jiffies
,
726 .strategy
= &sysctl_jiffies
,
729 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
730 .procname
= "printk_ratelimit_burst",
731 .data
= &printk_ratelimit_state
.burst
,
732 .maxlen
= sizeof(int),
734 .proc_handler
= &proc_dointvec
,
737 .ctl_name
= CTL_UNNUMBERED
,
738 .procname
= "printk_delay",
739 .data
= &printk_delay_msec
,
740 .maxlen
= sizeof(int),
742 .proc_handler
= &proc_dointvec_minmax
,
743 .strategy
= &sysctl_intvec
,
745 .extra2
= &ten_thousand
,
749 .ctl_name
= KERN_NGROUPS_MAX
,
750 .procname
= "ngroups_max",
751 .data
= &ngroups_max
,
752 .maxlen
= sizeof (int),
754 .proc_handler
= &proc_dointvec
,
756 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
758 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
759 .procname
= "unknown_nmi_panic",
760 .data
= &unknown_nmi_panic
,
761 .maxlen
= sizeof (int),
763 .proc_handler
= &proc_dointvec
,
766 .procname
= "nmi_watchdog",
767 .data
= &nmi_watchdog_enabled
,
768 .maxlen
= sizeof (int),
770 .proc_handler
= &proc_nmi_enabled
,
773 #if defined(CONFIG_X86)
775 .ctl_name
= KERN_PANIC_ON_NMI
,
776 .procname
= "panic_on_unrecovered_nmi",
777 .data
= &panic_on_unrecovered_nmi
,
778 .maxlen
= sizeof(int),
780 .proc_handler
= &proc_dointvec
,
783 .ctl_name
= CTL_UNNUMBERED
,
784 .procname
= "panic_on_io_nmi",
785 .data
= &panic_on_io_nmi
,
786 .maxlen
= sizeof(int),
788 .proc_handler
= &proc_dointvec
,
791 .ctl_name
= KERN_BOOTLOADER_TYPE
,
792 .procname
= "bootloader_type",
793 .data
= &bootloader_type
,
794 .maxlen
= sizeof (int),
796 .proc_handler
= &proc_dointvec
,
799 .ctl_name
= CTL_UNNUMBERED
,
800 .procname
= "bootloader_version",
801 .data
= &bootloader_version
,
802 .maxlen
= sizeof (int),
804 .proc_handler
= &proc_dointvec
,
807 .ctl_name
= CTL_UNNUMBERED
,
808 .procname
= "kstack_depth_to_print",
809 .data
= &kstack_depth_to_print
,
810 .maxlen
= sizeof(int),
812 .proc_handler
= &proc_dointvec
,
815 .ctl_name
= CTL_UNNUMBERED
,
816 .procname
= "io_delay_type",
817 .data
= &io_delay_type
,
818 .maxlen
= sizeof(int),
820 .proc_handler
= &proc_dointvec
,
823 #if defined(CONFIG_MMU)
825 .ctl_name
= KERN_RANDOMIZE
,
826 .procname
= "randomize_va_space",
827 .data
= &randomize_va_space
,
828 .maxlen
= sizeof(int),
830 .proc_handler
= &proc_dointvec
,
833 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
835 .ctl_name
= KERN_SPIN_RETRY
,
836 .procname
= "spin_retry",
838 .maxlen
= sizeof (int),
840 .proc_handler
= &proc_dointvec
,
843 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
845 .procname
= "acpi_video_flags",
846 .data
= &acpi_realmode_flags
,
847 .maxlen
= sizeof (unsigned long),
849 .proc_handler
= &proc_doulongvec_minmax
,
854 .ctl_name
= KERN_IA64_UNALIGNED
,
855 .procname
= "ignore-unaligned-usertrap",
856 .data
= &no_unaligned_warning
,
857 .maxlen
= sizeof (int),
859 .proc_handler
= &proc_dointvec
,
862 .ctl_name
= CTL_UNNUMBERED
,
863 .procname
= "unaligned-dump-stack",
864 .data
= &unaligned_dump_stack
,
865 .maxlen
= sizeof (int),
867 .proc_handler
= &proc_dointvec
,
870 #ifdef CONFIG_DETECT_SOFTLOCKUP
872 .ctl_name
= CTL_UNNUMBERED
,
873 .procname
= "softlockup_panic",
874 .data
= &softlockup_panic
,
875 .maxlen
= sizeof(int),
877 .proc_handler
= &proc_dointvec_minmax
,
878 .strategy
= &sysctl_intvec
,
883 .ctl_name
= CTL_UNNUMBERED
,
884 .procname
= "softlockup_thresh",
885 .data
= &softlockup_thresh
,
886 .maxlen
= sizeof(int),
888 .proc_handler
= &proc_dosoftlockup_thresh
,
889 .strategy
= &sysctl_intvec
,
894 #ifdef CONFIG_DETECT_HUNG_TASK
896 .ctl_name
= CTL_UNNUMBERED
,
897 .procname
= "hung_task_panic",
898 .data
= &sysctl_hung_task_panic
,
899 .maxlen
= sizeof(int),
901 .proc_handler
= &proc_dointvec_minmax
,
902 .strategy
= &sysctl_intvec
,
907 .ctl_name
= CTL_UNNUMBERED
,
908 .procname
= "hung_task_check_count",
909 .data
= &sysctl_hung_task_check_count
,
910 .maxlen
= sizeof(unsigned long),
912 .proc_handler
= &proc_doulongvec_minmax
,
913 .strategy
= &sysctl_intvec
,
916 .ctl_name
= CTL_UNNUMBERED
,
917 .procname
= "hung_task_timeout_secs",
918 .data
= &sysctl_hung_task_timeout_secs
,
919 .maxlen
= sizeof(unsigned long),
921 .proc_handler
= &proc_dohung_task_timeout_secs
,
922 .strategy
= &sysctl_intvec
,
925 .ctl_name
= CTL_UNNUMBERED
,
926 .procname
= "hung_task_warnings",
927 .data
= &sysctl_hung_task_warnings
,
928 .maxlen
= sizeof(unsigned long),
930 .proc_handler
= &proc_doulongvec_minmax
,
931 .strategy
= &sysctl_intvec
,
936 .ctl_name
= KERN_COMPAT_LOG
,
937 .procname
= "compat-log",
939 .maxlen
= sizeof (int),
941 .proc_handler
= &proc_dointvec
,
944 #ifdef CONFIG_RT_MUTEXES
946 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
947 .procname
= "max_lock_depth",
948 .data
= &max_lock_depth
,
949 .maxlen
= sizeof(int),
951 .proc_handler
= &proc_dointvec
,
955 .ctl_name
= CTL_UNNUMBERED
,
956 .procname
= "poweroff_cmd",
957 .data
= &poweroff_cmd
,
958 .maxlen
= POWEROFF_CMD_PATH_LEN
,
960 .proc_handler
= &proc_dostring
,
961 .strategy
= &sysctl_string
,
965 .ctl_name
= CTL_UNNUMBERED
,
968 .child
= key_sysctls
,
971 #ifdef CONFIG_RCU_TORTURE_TEST
973 .ctl_name
= CTL_UNNUMBERED
,
974 .procname
= "rcutorture_runnable",
975 .data
= &rcutorture_runnable
,
976 .maxlen
= sizeof(int),
978 .proc_handler
= &proc_dointvec
,
981 #ifdef CONFIG_SLOW_WORK
983 .ctl_name
= CTL_UNNUMBERED
,
984 .procname
= "slow-work",
986 .child
= slow_work_sysctls
,
989 #ifdef CONFIG_PERF_EVENTS
991 .ctl_name
= CTL_UNNUMBERED
,
992 .procname
= "perf_event_paranoid",
993 .data
= &sysctl_perf_event_paranoid
,
994 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
996 .proc_handler
= &proc_dointvec
,
999 .ctl_name
= CTL_UNNUMBERED
,
1000 .procname
= "perf_event_mlock_kb",
1001 .data
= &sysctl_perf_event_mlock
,
1002 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1004 .proc_handler
= &proc_dointvec
,
1007 .ctl_name
= CTL_UNNUMBERED
,
1008 .procname
= "perf_event_max_sample_rate",
1009 .data
= &sysctl_perf_event_sample_rate
,
1010 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1012 .proc_handler
= &proc_dointvec
,
1015 #ifdef CONFIG_KMEMCHECK
1017 .ctl_name
= CTL_UNNUMBERED
,
1018 .procname
= "kmemcheck",
1019 .data
= &kmemcheck_enabled
,
1020 .maxlen
= sizeof(int),
1022 .proc_handler
= &proc_dointvec
,
1027 .ctl_name
= CTL_UNNUMBERED
,
1028 .procname
= "blk_iopoll",
1029 .data
= &blk_iopoll_enabled
,
1030 .maxlen
= sizeof(int),
1032 .proc_handler
= &proc_dointvec
,
1036 * NOTE: do not add new entries to this table unless you have read
1037 * Documentation/sysctl/ctl_unnumbered.txt
1042 static struct ctl_table vm_table
[] = {
1044 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
1045 .procname
= "overcommit_memory",
1046 .data
= &sysctl_overcommit_memory
,
1047 .maxlen
= sizeof(sysctl_overcommit_memory
),
1049 .proc_handler
= &proc_dointvec
,
1052 .ctl_name
= VM_PANIC_ON_OOM
,
1053 .procname
= "panic_on_oom",
1054 .data
= &sysctl_panic_on_oom
,
1055 .maxlen
= sizeof(sysctl_panic_on_oom
),
1057 .proc_handler
= &proc_dointvec
,
1060 .ctl_name
= CTL_UNNUMBERED
,
1061 .procname
= "oom_kill_allocating_task",
1062 .data
= &sysctl_oom_kill_allocating_task
,
1063 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1065 .proc_handler
= &proc_dointvec
,
1068 .ctl_name
= CTL_UNNUMBERED
,
1069 .procname
= "oom_dump_tasks",
1070 .data
= &sysctl_oom_dump_tasks
,
1071 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1073 .proc_handler
= &proc_dointvec
,
1076 .ctl_name
= VM_OVERCOMMIT_RATIO
,
1077 .procname
= "overcommit_ratio",
1078 .data
= &sysctl_overcommit_ratio
,
1079 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1081 .proc_handler
= &proc_dointvec
,
1084 .ctl_name
= VM_PAGE_CLUSTER
,
1085 .procname
= "page-cluster",
1086 .data
= &page_cluster
,
1087 .maxlen
= sizeof(int),
1089 .proc_handler
= &proc_dointvec
,
1092 .ctl_name
= VM_DIRTY_BACKGROUND
,
1093 .procname
= "dirty_background_ratio",
1094 .data
= &dirty_background_ratio
,
1095 .maxlen
= sizeof(dirty_background_ratio
),
1097 .proc_handler
= &dirty_background_ratio_handler
,
1098 .strategy
= &sysctl_intvec
,
1100 .extra2
= &one_hundred
,
1103 .ctl_name
= CTL_UNNUMBERED
,
1104 .procname
= "dirty_background_bytes",
1105 .data
= &dirty_background_bytes
,
1106 .maxlen
= sizeof(dirty_background_bytes
),
1108 .proc_handler
= &dirty_background_bytes_handler
,
1109 .strategy
= &sysctl_intvec
,
1113 .ctl_name
= VM_DIRTY_RATIO
,
1114 .procname
= "dirty_ratio",
1115 .data
= &vm_dirty_ratio
,
1116 .maxlen
= sizeof(vm_dirty_ratio
),
1118 .proc_handler
= &dirty_ratio_handler
,
1119 .strategy
= &sysctl_intvec
,
1121 .extra2
= &one_hundred
,
1124 .ctl_name
= CTL_UNNUMBERED
,
1125 .procname
= "dirty_bytes",
1126 .data
= &vm_dirty_bytes
,
1127 .maxlen
= sizeof(vm_dirty_bytes
),
1129 .proc_handler
= &dirty_bytes_handler
,
1130 .strategy
= &sysctl_intvec
,
1131 .extra1
= &dirty_bytes_min
,
1134 .procname
= "dirty_writeback_centisecs",
1135 .data
= &dirty_writeback_interval
,
1136 .maxlen
= sizeof(dirty_writeback_interval
),
1138 .proc_handler
= &dirty_writeback_centisecs_handler
,
1141 .procname
= "dirty_expire_centisecs",
1142 .data
= &dirty_expire_interval
,
1143 .maxlen
= sizeof(dirty_expire_interval
),
1145 .proc_handler
= &proc_dointvec
,
1148 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
1149 .procname
= "nr_pdflush_threads",
1150 .data
= &nr_pdflush_threads
,
1151 .maxlen
= sizeof nr_pdflush_threads
,
1152 .mode
= 0444 /* read-only*/,
1153 .proc_handler
= &proc_dointvec
,
1156 .ctl_name
= VM_SWAPPINESS
,
1157 .procname
= "swappiness",
1158 .data
= &vm_swappiness
,
1159 .maxlen
= sizeof(vm_swappiness
),
1161 .proc_handler
= &proc_dointvec_minmax
,
1162 .strategy
= &sysctl_intvec
,
1164 .extra2
= &one_hundred
,
1166 #ifdef CONFIG_HUGETLB_PAGE
1168 .procname
= "nr_hugepages",
1170 .maxlen
= sizeof(unsigned long),
1172 .proc_handler
= &hugetlb_sysctl_handler
,
1173 .extra1
= (void *)&hugetlb_zero
,
1174 .extra2
= (void *)&hugetlb_infinity
,
1177 .ctl_name
= VM_HUGETLB_GROUP
,
1178 .procname
= "hugetlb_shm_group",
1179 .data
= &sysctl_hugetlb_shm_group
,
1180 .maxlen
= sizeof(gid_t
),
1182 .proc_handler
= &proc_dointvec
,
1185 .ctl_name
= CTL_UNNUMBERED
,
1186 .procname
= "hugepages_treat_as_movable",
1187 .data
= &hugepages_treat_as_movable
,
1188 .maxlen
= sizeof(int),
1190 .proc_handler
= &hugetlb_treat_movable_handler
,
1193 .ctl_name
= CTL_UNNUMBERED
,
1194 .procname
= "nr_overcommit_hugepages",
1196 .maxlen
= sizeof(unsigned long),
1198 .proc_handler
= &hugetlb_overcommit_handler
,
1199 .extra1
= (void *)&hugetlb_zero
,
1200 .extra2
= (void *)&hugetlb_infinity
,
1204 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
1205 .procname
= "lowmem_reserve_ratio",
1206 .data
= &sysctl_lowmem_reserve_ratio
,
1207 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1209 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
1210 .strategy
= &sysctl_intvec
,
1213 .ctl_name
= VM_DROP_PAGECACHE
,
1214 .procname
= "drop_caches",
1215 .data
= &sysctl_drop_caches
,
1216 .maxlen
= sizeof(int),
1218 .proc_handler
= drop_caches_sysctl_handler
,
1219 .strategy
= &sysctl_intvec
,
1222 .ctl_name
= VM_MIN_FREE_KBYTES
,
1223 .procname
= "min_free_kbytes",
1224 .data
= &min_free_kbytes
,
1225 .maxlen
= sizeof(min_free_kbytes
),
1227 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1228 .strategy
= &sysctl_intvec
,
1232 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1233 .procname
= "percpu_pagelist_fraction",
1234 .data
= &percpu_pagelist_fraction
,
1235 .maxlen
= sizeof(percpu_pagelist_fraction
),
1237 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1238 .strategy
= &sysctl_intvec
,
1239 .extra1
= &min_percpu_pagelist_fract
,
1243 .ctl_name
= VM_MAX_MAP_COUNT
,
1244 .procname
= "max_map_count",
1245 .data
= &sysctl_max_map_count
,
1246 .maxlen
= sizeof(sysctl_max_map_count
),
1248 .proc_handler
= &proc_dointvec
1252 .ctl_name
= CTL_UNNUMBERED
,
1253 .procname
= "nr_trim_pages",
1254 .data
= &sysctl_nr_trim_pages
,
1255 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1257 .proc_handler
= &proc_dointvec_minmax
,
1258 .strategy
= &sysctl_intvec
,
1263 .ctl_name
= VM_LAPTOP_MODE
,
1264 .procname
= "laptop_mode",
1265 .data
= &laptop_mode
,
1266 .maxlen
= sizeof(laptop_mode
),
1268 .proc_handler
= &proc_dointvec_jiffies
,
1269 .strategy
= &sysctl_jiffies
,
1272 .ctl_name
= VM_BLOCK_DUMP
,
1273 .procname
= "block_dump",
1274 .data
= &block_dump
,
1275 .maxlen
= sizeof(block_dump
),
1277 .proc_handler
= &proc_dointvec
,
1278 .strategy
= &sysctl_intvec
,
1282 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1283 .procname
= "vfs_cache_pressure",
1284 .data
= &sysctl_vfs_cache_pressure
,
1285 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1287 .proc_handler
= &proc_dointvec
,
1288 .strategy
= &sysctl_intvec
,
1291 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1293 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1294 .procname
= "legacy_va_layout",
1295 .data
= &sysctl_legacy_va_layout
,
1296 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1298 .proc_handler
= &proc_dointvec
,
1299 .strategy
= &sysctl_intvec
,
1305 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1306 .procname
= "zone_reclaim_mode",
1307 .data
= &zone_reclaim_mode
,
1308 .maxlen
= sizeof(zone_reclaim_mode
),
1310 .proc_handler
= &proc_dointvec
,
1311 .strategy
= &sysctl_intvec
,
1315 .ctl_name
= VM_MIN_UNMAPPED
,
1316 .procname
= "min_unmapped_ratio",
1317 .data
= &sysctl_min_unmapped_ratio
,
1318 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1320 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1321 .strategy
= &sysctl_intvec
,
1323 .extra2
= &one_hundred
,
1326 .ctl_name
= VM_MIN_SLAB
,
1327 .procname
= "min_slab_ratio",
1328 .data
= &sysctl_min_slab_ratio
,
1329 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1331 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1332 .strategy
= &sysctl_intvec
,
1334 .extra2
= &one_hundred
,
1339 .ctl_name
= CTL_UNNUMBERED
,
1340 .procname
= "stat_interval",
1341 .data
= &sysctl_stat_interval
,
1342 .maxlen
= sizeof(sysctl_stat_interval
),
1344 .proc_handler
= &proc_dointvec_jiffies
,
1345 .strategy
= &sysctl_jiffies
,
1349 .ctl_name
= CTL_UNNUMBERED
,
1350 .procname
= "mmap_min_addr",
1351 .data
= &dac_mmap_min_addr
,
1352 .maxlen
= sizeof(unsigned long),
1354 .proc_handler
= &mmap_min_addr_handler
,
1358 .ctl_name
= CTL_UNNUMBERED
,
1359 .procname
= "numa_zonelist_order",
1360 .data
= &numa_zonelist_order
,
1361 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1363 .proc_handler
= &numa_zonelist_order_handler
,
1364 .strategy
= &sysctl_string
,
1367 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1368 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1370 .ctl_name
= VM_VDSO_ENABLED
,
1371 .procname
= "vdso_enabled",
1372 .data
= &vdso_enabled
,
1373 .maxlen
= sizeof(vdso_enabled
),
1375 .proc_handler
= &proc_dointvec
,
1376 .strategy
= &sysctl_intvec
,
1380 #ifdef CONFIG_HIGHMEM
1382 .ctl_name
= CTL_UNNUMBERED
,
1383 .procname
= "highmem_is_dirtyable",
1384 .data
= &vm_highmem_is_dirtyable
,
1385 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1387 .proc_handler
= &proc_dointvec_minmax
,
1388 .strategy
= &sysctl_intvec
,
1394 .ctl_name
= CTL_UNNUMBERED
,
1395 .procname
= "scan_unevictable_pages",
1396 .data
= &scan_unevictable_pages
,
1397 .maxlen
= sizeof(scan_unevictable_pages
),
1399 .proc_handler
= &scan_unevictable_handler
,
1402 * NOTE: do not add new entries to this table unless you have read
1403 * Documentation/sysctl/ctl_unnumbered.txt
1408 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1409 static struct ctl_table binfmt_misc_table
[] = {
1414 static struct ctl_table fs_table
[] = {
1416 .ctl_name
= FS_NRINODE
,
1417 .procname
= "inode-nr",
1418 .data
= &inodes_stat
,
1419 .maxlen
= 2*sizeof(int),
1421 .proc_handler
= &proc_dointvec
,
1424 .ctl_name
= FS_STATINODE
,
1425 .procname
= "inode-state",
1426 .data
= &inodes_stat
,
1427 .maxlen
= 7*sizeof(int),
1429 .proc_handler
= &proc_dointvec
,
1432 .procname
= "file-nr",
1433 .data
= &files_stat
,
1434 .maxlen
= 3*sizeof(int),
1436 .proc_handler
= &proc_nr_files
,
1439 .ctl_name
= FS_MAXFILE
,
1440 .procname
= "file-max",
1441 .data
= &files_stat
.max_files
,
1442 .maxlen
= sizeof(int),
1444 .proc_handler
= &proc_dointvec
,
1447 .ctl_name
= CTL_UNNUMBERED
,
1448 .procname
= "nr_open",
1449 .data
= &sysctl_nr_open
,
1450 .maxlen
= sizeof(int),
1452 .proc_handler
= &proc_dointvec_minmax
,
1453 .extra1
= &sysctl_nr_open_min
,
1454 .extra2
= &sysctl_nr_open_max
,
1457 .ctl_name
= FS_DENTRY
,
1458 .procname
= "dentry-state",
1459 .data
= &dentry_stat
,
1460 .maxlen
= 6*sizeof(int),
1462 .proc_handler
= &proc_dointvec
,
1465 .ctl_name
= FS_OVERFLOWUID
,
1466 .procname
= "overflowuid",
1467 .data
= &fs_overflowuid
,
1468 .maxlen
= sizeof(int),
1470 .proc_handler
= &proc_dointvec_minmax
,
1471 .strategy
= &sysctl_intvec
,
1472 .extra1
= &minolduid
,
1473 .extra2
= &maxolduid
,
1476 .ctl_name
= FS_OVERFLOWGID
,
1477 .procname
= "overflowgid",
1478 .data
= &fs_overflowgid
,
1479 .maxlen
= sizeof(int),
1481 .proc_handler
= &proc_dointvec_minmax
,
1482 .strategy
= &sysctl_intvec
,
1483 .extra1
= &minolduid
,
1484 .extra2
= &maxolduid
,
1486 #ifdef CONFIG_FILE_LOCKING
1488 .ctl_name
= FS_LEASES
,
1489 .procname
= "leases-enable",
1490 .data
= &leases_enable
,
1491 .maxlen
= sizeof(int),
1493 .proc_handler
= &proc_dointvec
,
1496 #ifdef CONFIG_DNOTIFY
1498 .ctl_name
= FS_DIR_NOTIFY
,
1499 .procname
= "dir-notify-enable",
1500 .data
= &dir_notify_enable
,
1501 .maxlen
= sizeof(int),
1503 .proc_handler
= &proc_dointvec
,
1507 #ifdef CONFIG_FILE_LOCKING
1509 .ctl_name
= FS_LEASE_TIME
,
1510 .procname
= "lease-break-time",
1511 .data
= &lease_break_time
,
1512 .maxlen
= sizeof(int),
1514 .proc_handler
= &proc_dointvec
,
1519 .procname
= "aio-nr",
1521 .maxlen
= sizeof(aio_nr
),
1523 .proc_handler
= &proc_doulongvec_minmax
,
1526 .procname
= "aio-max-nr",
1527 .data
= &aio_max_nr
,
1528 .maxlen
= sizeof(aio_max_nr
),
1530 .proc_handler
= &proc_doulongvec_minmax
,
1532 #endif /* CONFIG_AIO */
1533 #ifdef CONFIG_INOTIFY_USER
1535 .ctl_name
= FS_INOTIFY
,
1536 .procname
= "inotify",
1538 .child
= inotify_table
,
1543 .procname
= "epoll",
1545 .child
= epoll_table
,
1550 .ctl_name
= KERN_SETUID_DUMPABLE
,
1551 .procname
= "suid_dumpable",
1552 .data
= &suid_dumpable
,
1553 .maxlen
= sizeof(int),
1555 .proc_handler
= &proc_dointvec_minmax
,
1556 .strategy
= &sysctl_intvec
,
1560 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1562 .ctl_name
= CTL_UNNUMBERED
,
1563 .procname
= "binfmt_misc",
1565 .child
= binfmt_misc_table
,
1569 * NOTE: do not add new entries to this table unless you have read
1570 * Documentation/sysctl/ctl_unnumbered.txt
1575 static struct ctl_table debug_table
[] = {
1576 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1578 .ctl_name
= CTL_UNNUMBERED
,
1579 .procname
= "exception-trace",
1580 .data
= &show_unhandled_signals
,
1581 .maxlen
= sizeof(int),
1583 .proc_handler
= proc_dointvec
1589 static struct ctl_table dev_table
[] = {
1593 static DEFINE_SPINLOCK(sysctl_lock
);
1595 /* called under sysctl_lock */
1596 static int use_table(struct ctl_table_header
*p
)
1598 if (unlikely(p
->unregistering
))
1604 /* called under sysctl_lock */
1605 static void unuse_table(struct ctl_table_header
*p
)
1608 if (unlikely(p
->unregistering
))
1609 complete(p
->unregistering
);
1612 /* called under sysctl_lock, will reacquire if has to wait */
1613 static void start_unregistering(struct ctl_table_header
*p
)
1616 * if p->used is 0, nobody will ever touch that entry again;
1617 * we'll eliminate all paths to it before dropping sysctl_lock
1619 if (unlikely(p
->used
)) {
1620 struct completion wait
;
1621 init_completion(&wait
);
1622 p
->unregistering
= &wait
;
1623 spin_unlock(&sysctl_lock
);
1624 wait_for_completion(&wait
);
1625 spin_lock(&sysctl_lock
);
1627 /* anything non-NULL; we'll never dereference it */
1628 p
->unregistering
= ERR_PTR(-EINVAL
);
1631 * do not remove from the list until nobody holds it; walking the
1632 * list in do_sysctl() relies on that.
1634 list_del_init(&p
->ctl_entry
);
1637 void sysctl_head_get(struct ctl_table_header
*head
)
1639 spin_lock(&sysctl_lock
);
1641 spin_unlock(&sysctl_lock
);
1644 void sysctl_head_put(struct ctl_table_header
*head
)
1646 spin_lock(&sysctl_lock
);
1649 spin_unlock(&sysctl_lock
);
1652 struct ctl_table_header
*sysctl_head_grab(struct ctl_table_header
*head
)
1656 spin_lock(&sysctl_lock
);
1657 if (!use_table(head
))
1658 head
= ERR_PTR(-ENOENT
);
1659 spin_unlock(&sysctl_lock
);
1663 void sysctl_head_finish(struct ctl_table_header
*head
)
1667 spin_lock(&sysctl_lock
);
1669 spin_unlock(&sysctl_lock
);
1672 static struct ctl_table_set
*
1673 lookup_header_set(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1675 struct ctl_table_set
*set
= &root
->default_set
;
1677 set
= root
->lookup(root
, namespaces
);
1681 static struct list_head
*
1682 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1684 struct ctl_table_set
*set
= lookup_header_set(root
, namespaces
);
1688 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1689 struct ctl_table_header
*prev
)
1691 struct ctl_table_root
*root
;
1692 struct list_head
*header_list
;
1693 struct ctl_table_header
*head
;
1694 struct list_head
*tmp
;
1696 spin_lock(&sysctl_lock
);
1699 tmp
= &prev
->ctl_entry
;
1703 tmp
= &root_table_header
.ctl_entry
;
1705 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1707 if (!use_table(head
))
1709 spin_unlock(&sysctl_lock
);
1714 header_list
= lookup_header_list(root
, namespaces
);
1715 if (tmp
!= header_list
)
1719 root
= list_entry(root
->root_list
.next
,
1720 struct ctl_table_root
, root_list
);
1721 if (root
== &sysctl_table_root
)
1723 header_list
= lookup_header_list(root
, namespaces
);
1724 } while (list_empty(header_list
));
1725 tmp
= header_list
->next
;
1728 spin_unlock(&sysctl_lock
);
1732 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1734 return __sysctl_head_next(current
->nsproxy
, prev
);
1737 void register_sysctl_root(struct ctl_table_root
*root
)
1739 spin_lock(&sysctl_lock
);
1740 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1741 spin_unlock(&sysctl_lock
);
1744 #ifdef CONFIG_SYSCTL_SYSCALL
1745 /* Perform the actual read/write of a sysctl table entry. */
1746 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1747 struct ctl_table
*table
,
1748 void __user
*oldval
, size_t __user
*oldlenp
,
1749 void __user
*newval
, size_t newlen
)
1757 if (sysctl_perm(root
, table
, op
))
1760 if (table
->strategy
) {
1761 rc
= table
->strategy(table
, oldval
, oldlenp
, newval
, newlen
);
1768 /* If there is no strategy routine, or if the strategy returns
1769 * zero, proceed with automatic r/w */
1770 if (table
->data
&& table
->maxlen
) {
1771 rc
= sysctl_data(table
, oldval
, oldlenp
, newval
, newlen
);
1778 static int parse_table(int __user
*name
, int nlen
,
1779 void __user
*oldval
, size_t __user
*oldlenp
,
1780 void __user
*newval
, size_t newlen
,
1781 struct ctl_table_root
*root
,
1782 struct ctl_table
*table
)
1788 if (get_user(n
, name
))
1790 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1791 if (!table
->ctl_name
)
1793 if (n
== table
->ctl_name
) {
1796 if (sysctl_perm(root
, table
, MAY_EXEC
))
1800 table
= table
->child
;
1803 error
= do_sysctl_strategy(root
, table
,
1812 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1813 void __user
*newval
, size_t newlen
)
1815 struct ctl_table_header
*head
;
1816 int error
= -ENOTDIR
;
1818 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1822 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1826 for (head
= sysctl_head_next(NULL
); head
;
1827 head
= sysctl_head_next(head
)) {
1828 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1830 head
->root
, head
->ctl_table
);
1831 if (error
!= -ENOTDIR
) {
1832 sysctl_head_finish(head
);
1839 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
1841 struct __sysctl_args tmp
;
1844 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1847 error
= deprecated_sysctl_warning(&tmp
);
1852 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1853 tmp
.newval
, tmp
.newlen
);
1858 #endif /* CONFIG_SYSCTL_SYSCALL */
1861 * sysctl_perm does NOT grant the superuser all rights automatically, because
1862 * some sysctl variables are readonly even to root.
1865 static int test_perm(int mode
, int op
)
1867 if (!current_euid())
1869 else if (in_egroup_p(0))
1871 if ((op
& ~mode
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
)) == 0)
1876 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1881 error
= security_sysctl(table
, op
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
));
1885 if (root
->permissions
)
1886 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1890 return test_perm(mode
, op
);
1893 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1895 for (; table
->ctl_name
|| table
->procname
; table
++) {
1896 table
->parent
= parent
;
1898 sysctl_set_parent(table
, table
->child
);
1902 static __init
int sysctl_init(void)
1904 sysctl_set_parent(NULL
, root_table
);
1905 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1908 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1914 core_initcall(sysctl_init
);
1916 static struct ctl_table
*is_branch_in(struct ctl_table
*branch
,
1917 struct ctl_table
*table
)
1919 struct ctl_table
*p
;
1920 const char *s
= branch
->procname
;
1922 /* branch should have named subdirectory as its first element */
1923 if (!s
|| !branch
->child
)
1926 /* ... and nothing else */
1927 if (branch
[1].procname
|| branch
[1].ctl_name
)
1930 /* table should contain subdirectory with the same name */
1931 for (p
= table
; p
->procname
|| p
->ctl_name
; p
++) {
1934 if (p
->procname
&& strcmp(p
->procname
, s
) == 0)
1940 /* see if attaching q to p would be an improvement */
1941 static void try_attach(struct ctl_table_header
*p
, struct ctl_table_header
*q
)
1943 struct ctl_table
*to
= p
->ctl_table
, *by
= q
->ctl_table
;
1944 struct ctl_table
*next
;
1946 int not_in_parent
= !p
->attached_by
;
1948 while ((next
= is_branch_in(by
, to
)) != NULL
) {
1949 if (by
== q
->attached_by
)
1951 if (to
== p
->attached_by
)
1957 if (is_better
&& not_in_parent
) {
1958 q
->attached_by
= by
;
1959 q
->attached_to
= to
;
1965 * __register_sysctl_paths - register a sysctl hierarchy
1966 * @root: List of sysctl headers to register on
1967 * @namespaces: Data to compute which lists of sysctl entries are visible
1968 * @path: The path to the directory the sysctl table is in.
1969 * @table: the top-level table structure
1971 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1972 * array. A completely 0 filled entry terminates the table.
1974 * The members of the &struct ctl_table structure are used as follows:
1976 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1977 * must be unique within that level of sysctl
1979 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1980 * enter a sysctl file
1982 * data - a pointer to data for use by proc_handler
1984 * maxlen - the maximum size in bytes of the data
1986 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1988 * child - a pointer to the child sysctl table if this entry is a directory, or
1991 * proc_handler - the text handler routine (described below)
1993 * strategy - the strategy routine (described below)
1995 * de - for internal use by the sysctl routines
1997 * extra1, extra2 - extra pointers usable by the proc handler routines
1999 * Leaf nodes in the sysctl tree will be represented by a single file
2000 * under /proc; non-leaf nodes will be represented by directories.
2002 * sysctl(2) can automatically manage read and write requests through
2003 * the sysctl table. The data and maxlen fields of the ctl_table
2004 * struct enable minimal validation of the values being written to be
2005 * performed, and the mode field allows minimal authentication.
2007 * More sophisticated management can be enabled by the provision of a
2008 * strategy routine with the table entry. This will be called before
2009 * any automatic read or write of the data is performed.
2011 * The strategy routine may return
2013 * < 0 - Error occurred (error is passed to user process)
2015 * 0 - OK - proceed with automatic read or write.
2017 * > 0 - OK - read or write has been done by the strategy routine, so
2018 * return immediately.
2020 * There must be a proc_handler routine for any terminal nodes
2021 * mirrored under /proc/sys (non-terminals are handled by a built-in
2022 * directory handler). Several default handlers are available to
2023 * cover common cases -
2025 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2026 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2027 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2029 * It is the handler's job to read the input buffer from user memory
2030 * and process it. The handler should return 0 on success.
2032 * This routine returns %NULL on a failure to register, and a pointer
2033 * to the table header on success.
2035 struct ctl_table_header
*__register_sysctl_paths(
2036 struct ctl_table_root
*root
,
2037 struct nsproxy
*namespaces
,
2038 const struct ctl_path
*path
, struct ctl_table
*table
)
2040 struct ctl_table_header
*header
;
2041 struct ctl_table
*new, **prevp
;
2042 unsigned int n
, npath
;
2043 struct ctl_table_set
*set
;
2045 /* Count the path components */
2046 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
2050 * For each path component, allocate a 2-element ctl_table array.
2051 * The first array element will be filled with the sysctl entry
2052 * for this, the second will be the sentinel (ctl_name == 0).
2054 * We allocate everything in one go so that we don't have to
2055 * worry about freeing additional memory in unregister_sysctl_table.
2057 header
= kzalloc(sizeof(struct ctl_table_header
) +
2058 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
2062 new = (struct ctl_table
*) (header
+ 1);
2064 /* Now connect the dots */
2065 prevp
= &header
->ctl_table
;
2066 for (n
= 0; n
< npath
; ++n
, ++path
) {
2067 /* Copy the procname */
2068 new->procname
= path
->procname
;
2069 new->ctl_name
= path
->ctl_name
;
2073 prevp
= &new->child
;
2078 header
->ctl_table_arg
= table
;
2080 INIT_LIST_HEAD(&header
->ctl_entry
);
2082 header
->unregistering
= NULL
;
2083 header
->root
= root
;
2084 sysctl_set_parent(NULL
, header
->ctl_table
);
2086 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2087 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
2092 spin_lock(&sysctl_lock
);
2093 header
->set
= lookup_header_set(root
, namespaces
);
2094 header
->attached_by
= header
->ctl_table
;
2095 header
->attached_to
= root_table
;
2096 header
->parent
= &root_table_header
;
2097 for (set
= header
->set
; set
; set
= set
->parent
) {
2098 struct ctl_table_header
*p
;
2099 list_for_each_entry(p
, &set
->list
, ctl_entry
) {
2100 if (p
->unregistering
)
2102 try_attach(p
, header
);
2105 header
->parent
->count
++;
2106 list_add_tail(&header
->ctl_entry
, &header
->set
->list
);
2107 spin_unlock(&sysctl_lock
);
2113 * register_sysctl_table_path - register a sysctl table hierarchy
2114 * @path: The path to the directory the sysctl table is in.
2115 * @table: the top-level table structure
2117 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2118 * array. A completely 0 filled entry terminates the table.
2120 * See __register_sysctl_paths for more details.
2122 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2123 struct ctl_table
*table
)
2125 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
2130 * register_sysctl_table - register a sysctl table hierarchy
2131 * @table: the top-level table structure
2133 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2134 * array. A completely 0 filled entry terminates the table.
2136 * See register_sysctl_paths for more details.
2138 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
2140 static const struct ctl_path null_path
[] = { {} };
2142 return register_sysctl_paths(null_path
, table
);
2146 * unregister_sysctl_table - unregister a sysctl table hierarchy
2147 * @header: the header returned from register_sysctl_table
2149 * Unregisters the sysctl table and all children. proc entries may not
2150 * actually be removed until they are no longer used by anyone.
2152 void unregister_sysctl_table(struct ctl_table_header
* header
)
2159 spin_lock(&sysctl_lock
);
2160 start_unregistering(header
);
2161 if (!--header
->parent
->count
) {
2163 kfree(header
->parent
);
2165 if (!--header
->count
)
2167 spin_unlock(&sysctl_lock
);
2170 int sysctl_is_seen(struct ctl_table_header
*p
)
2172 struct ctl_table_set
*set
= p
->set
;
2174 spin_lock(&sysctl_lock
);
2175 if (p
->unregistering
)
2177 else if (!set
->is_seen
)
2180 res
= set
->is_seen(set
);
2181 spin_unlock(&sysctl_lock
);
2185 void setup_sysctl_set(struct ctl_table_set
*p
,
2186 struct ctl_table_set
*parent
,
2187 int (*is_seen
)(struct ctl_table_set
*))
2189 INIT_LIST_HEAD(&p
->list
);
2190 p
->parent
= parent
? parent
: &sysctl_table_root
.default_set
;
2191 p
->is_seen
= is_seen
;
2194 #else /* !CONFIG_SYSCTL */
2195 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
2200 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2201 struct ctl_table
*table
)
2206 void unregister_sysctl_table(struct ctl_table_header
* table
)
2210 void setup_sysctl_set(struct ctl_table_set
*p
,
2211 struct ctl_table_set
*parent
,
2212 int (*is_seen
)(struct ctl_table_set
*))
2216 void sysctl_head_put(struct ctl_table_header
*head
)
2220 #endif /* CONFIG_SYSCTL */
2226 #ifdef CONFIG_PROC_SYSCTL
2228 static int _proc_do_string(void* data
, int maxlen
, int write
,
2229 struct file
*filp
, void __user
*buffer
,
2230 size_t *lenp
, loff_t
*ppos
)
2236 if (!data
|| !maxlen
|| !*lenp
) {
2244 while (len
< *lenp
) {
2245 if (get_user(c
, p
++))
2247 if (c
== 0 || c
== '\n')
2253 if(copy_from_user(data
, buffer
, len
))
2255 ((char *) data
)[len
] = 0;
2273 if(copy_to_user(buffer
, data
, len
))
2276 if(put_user('\n', ((char __user
*) buffer
) + len
))
2287 * proc_dostring - read a string sysctl
2288 * @table: the sysctl table
2289 * @write: %TRUE if this is a write to the sysctl file
2290 * @filp: the file structure
2291 * @buffer: the user buffer
2292 * @lenp: the size of the user buffer
2293 * @ppos: file position
2295 * Reads/writes a string from/to the user buffer. If the kernel
2296 * buffer provided is not large enough to hold the string, the
2297 * string is truncated. The copied string is %NULL-terminated.
2298 * If the string is being read by the user process, it is copied
2299 * and a newline '\n' is added. It is truncated if the buffer is
2302 * Returns 0 on success.
2304 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2305 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2307 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
2308 buffer
, lenp
, ppos
);
2312 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
2314 int write
, void *data
)
2317 *valp
= *negp
? -*lvalp
: *lvalp
;
2322 *lvalp
= (unsigned long)-val
;
2325 *lvalp
= (unsigned long)val
;
2331 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2332 int write
, struct file
*filp
, void __user
*buffer
,
2333 size_t *lenp
, loff_t
*ppos
,
2334 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2335 int write
, void *data
),
2338 #define TMPBUFLEN 21
2339 int *i
, vleft
, first
= 1, neg
;
2343 char buf
[TMPBUFLEN
], *p
;
2344 char __user
*s
= buffer
;
2346 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
2347 (*ppos
&& !write
)) {
2352 i
= (int *) tbl_data
;
2353 vleft
= table
->maxlen
/ sizeof(*i
);
2357 conv
= do_proc_dointvec_conv
;
2359 for (; left
&& vleft
--; i
++, first
=0) {
2374 if (len
> sizeof(buf
) - 1)
2375 len
= sizeof(buf
) - 1;
2376 if (copy_from_user(buf
, s
, len
))
2380 if (*p
== '-' && left
> 1) {
2384 if (*p
< '0' || *p
> '9')
2387 lval
= simple_strtoul(p
, &p
, 0);
2390 if ((len
< left
) && *p
&& !isspace(*p
))
2395 if (conv(&neg
, &lval
, i
, 1, data
))
2402 if (conv(&neg
, &lval
, i
, 0, data
))
2405 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2409 if(copy_to_user(s
, buf
, len
))
2416 if (!write
&& !first
&& left
) {
2417 if(put_user('\n', s
))
2424 if (get_user(c
, s
++))
2439 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2440 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2441 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2442 int write
, void *data
),
2445 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2446 buffer
, lenp
, ppos
, conv
, data
);
2450 * proc_dointvec - read a vector of integers
2451 * @table: the sysctl table
2452 * @write: %TRUE if this is a write to the sysctl file
2453 * @filp: the file structure
2454 * @buffer: the user buffer
2455 * @lenp: the size of the user buffer
2456 * @ppos: file position
2458 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2459 * values from/to the user buffer, treated as an ASCII string.
2461 * Returns 0 on success.
2463 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2464 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2466 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2471 * Taint values can only be increased
2472 * This means we can safely use a temporary.
2474 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2475 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2478 unsigned long tmptaint
= get_taint();
2481 if (write
&& !capable(CAP_SYS_ADMIN
))
2486 err
= proc_doulongvec_minmax(&t
, write
, filp
, buffer
, lenp
, ppos
);
2492 * Poor man's atomic or. Not worth adding a primitive
2493 * to everyone's atomic.h for this
2496 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2497 if ((tmptaint
>> i
) & 1)
2505 struct do_proc_dointvec_minmax_conv_param
{
2510 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2512 int write
, void *data
)
2514 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2516 int val
= *negp
? -*lvalp
: *lvalp
;
2517 if ((param
->min
&& *param
->min
> val
) ||
2518 (param
->max
&& *param
->max
< val
))
2525 *lvalp
= (unsigned long)-val
;
2528 *lvalp
= (unsigned long)val
;
2535 * proc_dointvec_minmax - read a vector of integers with min/max values
2536 * @table: the sysctl table
2537 * @write: %TRUE if this is a write to the sysctl file
2538 * @filp: the file structure
2539 * @buffer: the user buffer
2540 * @lenp: the size of the user buffer
2541 * @ppos: file position
2543 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2544 * values from/to the user buffer, treated as an ASCII string.
2546 * This routine will ensure the values are within the range specified by
2547 * table->extra1 (min) and table->extra2 (max).
2549 * Returns 0 on success.
2551 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2552 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2554 struct do_proc_dointvec_minmax_conv_param param
= {
2555 .min
= (int *) table
->extra1
,
2556 .max
= (int *) table
->extra2
,
2558 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2559 do_proc_dointvec_minmax_conv
, ¶m
);
2562 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2564 void __user
*buffer
,
2565 size_t *lenp
, loff_t
*ppos
,
2566 unsigned long convmul
,
2567 unsigned long convdiv
)
2569 #define TMPBUFLEN 21
2570 unsigned long *i
, *min
, *max
, val
;
2571 int vleft
, first
=1, neg
;
2573 char buf
[TMPBUFLEN
], *p
;
2574 char __user
*s
= buffer
;
2576 if (!data
|| !table
->maxlen
|| !*lenp
||
2577 (*ppos
&& !write
)) {
2582 i
= (unsigned long *) data
;
2583 min
= (unsigned long *) table
->extra1
;
2584 max
= (unsigned long *) table
->extra2
;
2585 vleft
= table
->maxlen
/ sizeof(unsigned long);
2588 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2603 if (len
> TMPBUFLEN
-1)
2605 if (copy_from_user(buf
, s
, len
))
2609 if (*p
== '-' && left
> 1) {
2613 if (*p
< '0' || *p
> '9')
2615 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2617 if ((len
< left
) && *p
&& !isspace(*p
))
2626 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2633 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2637 if(copy_to_user(s
, buf
, len
))
2644 if (!write
&& !first
&& left
) {
2645 if(put_user('\n', s
))
2652 if (get_user(c
, s
++))
2667 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2669 void __user
*buffer
,
2670 size_t *lenp
, loff_t
*ppos
,
2671 unsigned long convmul
,
2672 unsigned long convdiv
)
2674 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2675 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2679 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2680 * @table: the sysctl table
2681 * @write: %TRUE if this is a write to the sysctl file
2682 * @filp: the file structure
2683 * @buffer: the user buffer
2684 * @lenp: the size of the user buffer
2685 * @ppos: file position
2687 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2688 * values from/to the user buffer, treated as an ASCII string.
2690 * This routine will ensure the values are within the range specified by
2691 * table->extra1 (min) and table->extra2 (max).
2693 * Returns 0 on success.
2695 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2696 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2698 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2702 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2703 * @table: the sysctl table
2704 * @write: %TRUE if this is a write to the sysctl file
2705 * @filp: the file structure
2706 * @buffer: the user buffer
2707 * @lenp: the size of the user buffer
2708 * @ppos: file position
2710 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2711 * values from/to the user buffer, treated as an ASCII string. The values
2712 * are treated as milliseconds, and converted to jiffies when they are stored.
2714 * This routine will ensure the values are within the range specified by
2715 * table->extra1 (min) and table->extra2 (max).
2717 * Returns 0 on success.
2719 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2721 void __user
*buffer
,
2722 size_t *lenp
, loff_t
*ppos
)
2724 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2725 lenp
, ppos
, HZ
, 1000l);
2729 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2731 int write
, void *data
)
2734 if (*lvalp
> LONG_MAX
/ HZ
)
2736 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2742 lval
= (unsigned long)-val
;
2745 lval
= (unsigned long)val
;
2752 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2754 int write
, void *data
)
2757 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2759 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2765 lval
= (unsigned long)-val
;
2768 lval
= (unsigned long)val
;
2770 *lvalp
= jiffies_to_clock_t(lval
);
2775 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2777 int write
, void *data
)
2780 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2786 lval
= (unsigned long)-val
;
2789 lval
= (unsigned long)val
;
2791 *lvalp
= jiffies_to_msecs(lval
);
2797 * proc_dointvec_jiffies - read a vector of integers as seconds
2798 * @table: the sysctl table
2799 * @write: %TRUE if this is a write to the sysctl file
2800 * @filp: the file structure
2801 * @buffer: the user buffer
2802 * @lenp: the size of the user buffer
2803 * @ppos: file position
2805 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2806 * values from/to the user buffer, treated as an ASCII string.
2807 * The values read are assumed to be in seconds, and are converted into
2810 * Returns 0 on success.
2812 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2813 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2815 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2816 do_proc_dointvec_jiffies_conv
,NULL
);
2820 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2821 * @table: the sysctl table
2822 * @write: %TRUE if this is a write to the sysctl file
2823 * @filp: the file structure
2824 * @buffer: the user buffer
2825 * @lenp: the size of the user buffer
2826 * @ppos: pointer to the file position
2828 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2829 * values from/to the user buffer, treated as an ASCII string.
2830 * The values read are assumed to be in 1/USER_HZ seconds, and
2831 * are converted into jiffies.
2833 * Returns 0 on success.
2835 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2836 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2838 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2839 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2843 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2844 * @table: the sysctl table
2845 * @write: %TRUE if this is a write to the sysctl file
2846 * @filp: the file structure
2847 * @buffer: the user buffer
2848 * @lenp: the size of the user buffer
2849 * @ppos: file position
2850 * @ppos: the current position in the file
2852 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2853 * values from/to the user buffer, treated as an ASCII string.
2854 * The values read are assumed to be in 1/1000 seconds, and
2855 * are converted into jiffies.
2857 * Returns 0 on success.
2859 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2860 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2862 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2863 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2866 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2867 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2869 struct pid
*new_pid
;
2873 tmp
= pid_vnr(cad_pid
);
2875 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2876 lenp
, ppos
, NULL
, NULL
);
2880 new_pid
= find_get_pid(tmp
);
2884 put_pid(xchg(&cad_pid
, new_pid
));
2888 #else /* CONFIG_PROC_FS */
2890 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2891 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2896 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2897 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2902 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2903 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2908 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2909 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2914 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2915 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2920 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2921 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2926 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2927 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2932 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2934 void __user
*buffer
,
2935 size_t *lenp
, loff_t
*ppos
)
2941 #endif /* CONFIG_PROC_FS */
2944 #ifdef CONFIG_SYSCTL_SYSCALL
2946 * General sysctl support routines
2949 /* The generic sysctl data routine (used if no strategy routine supplied) */
2950 int sysctl_data(struct ctl_table
*table
,
2951 void __user
*oldval
, size_t __user
*oldlenp
,
2952 void __user
*newval
, size_t newlen
)
2956 /* Get out of I don't have a variable */
2957 if (!table
->data
|| !table
->maxlen
)
2960 if (oldval
&& oldlenp
) {
2961 if (get_user(len
, oldlenp
))
2964 if (len
> table
->maxlen
)
2965 len
= table
->maxlen
;
2966 if (copy_to_user(oldval
, table
->data
, len
))
2968 if (put_user(len
, oldlenp
))
2973 if (newval
&& newlen
) {
2974 if (newlen
> table
->maxlen
)
2975 newlen
= table
->maxlen
;
2977 if (copy_from_user(table
->data
, newval
, newlen
))
2983 /* The generic string strategy routine: */
2984 int sysctl_string(struct ctl_table
*table
,
2985 void __user
*oldval
, size_t __user
*oldlenp
,
2986 void __user
*newval
, size_t newlen
)
2988 if (!table
->data
|| !table
->maxlen
)
2991 if (oldval
&& oldlenp
) {
2993 if (get_user(bufsize
, oldlenp
))
2996 size_t len
= strlen(table
->data
), copied
;
2998 /* This shouldn't trigger for a well-formed sysctl */
2999 if (len
> table
->maxlen
)
3000 len
= table
->maxlen
;
3002 /* Copy up to a max of bufsize-1 bytes of the string */
3003 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
3005 if (copy_to_user(oldval
, table
->data
, copied
) ||
3006 put_user(0, (char __user
*)(oldval
+ copied
)))
3008 if (put_user(len
, oldlenp
))
3012 if (newval
&& newlen
) {
3013 size_t len
= newlen
;
3014 if (len
> table
->maxlen
)
3015 len
= table
->maxlen
;
3016 if(copy_from_user(table
->data
, newval
, len
))
3018 if (len
== table
->maxlen
)
3020 ((char *) table
->data
)[len
] = 0;
3026 * This function makes sure that all of the integers in the vector
3027 * are between the minimum and maximum values given in the arrays
3028 * table->extra1 and table->extra2, respectively.
3030 int sysctl_intvec(struct ctl_table
*table
,
3031 void __user
*oldval
, size_t __user
*oldlenp
,
3032 void __user
*newval
, size_t newlen
)
3035 if (newval
&& newlen
) {
3036 int __user
*vec
= (int __user
*) newval
;
3037 int *min
= (int *) table
->extra1
;
3038 int *max
= (int *) table
->extra2
;
3042 if (newlen
% sizeof(int) != 0)
3045 if (!table
->extra1
&& !table
->extra2
)
3048 if (newlen
> table
->maxlen
)
3049 newlen
= table
->maxlen
;
3050 length
= newlen
/ sizeof(int);
3052 for (i
= 0; i
< length
; i
++) {
3054 if (get_user(value
, vec
+ i
))
3056 if (min
&& value
< min
[i
])
3058 if (max
&& value
> max
[i
])
3065 /* Strategy function to convert jiffies to seconds */
3066 int sysctl_jiffies(struct ctl_table
*table
,
3067 void __user
*oldval
, size_t __user
*oldlenp
,
3068 void __user
*newval
, size_t newlen
)
3070 if (oldval
&& oldlenp
) {
3073 if (get_user(olen
, oldlenp
))
3078 if (olen
< sizeof(int))
3081 val
= *(int *)(table
->data
) / HZ
;
3082 if (put_user(val
, (int __user
*)oldval
))
3084 if (put_user(sizeof(int), oldlenp
))
3088 if (newval
&& newlen
) {
3090 if (newlen
!= sizeof(int))
3092 if (get_user(new, (int __user
*)newval
))
3094 *(int *)(table
->data
) = new*HZ
;
3099 /* Strategy function to convert jiffies to seconds */
3100 int sysctl_ms_jiffies(struct ctl_table
*table
,
3101 void __user
*oldval
, size_t __user
*oldlenp
,
3102 void __user
*newval
, size_t newlen
)
3104 if (oldval
&& oldlenp
) {
3107 if (get_user(olen
, oldlenp
))
3112 if (olen
< sizeof(int))
3115 val
= jiffies_to_msecs(*(int *)(table
->data
));
3116 if (put_user(val
, (int __user
*)oldval
))
3118 if (put_user(sizeof(int), oldlenp
))
3122 if (newval
&& newlen
) {
3124 if (newlen
!= sizeof(int))
3126 if (get_user(new, (int __user
*)newval
))
3128 *(int *)(table
->data
) = msecs_to_jiffies(new);
3135 #else /* CONFIG_SYSCTL_SYSCALL */
3138 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
3140 struct __sysctl_args tmp
;
3143 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
3146 error
= deprecated_sysctl_warning(&tmp
);
3148 /* If no error reading the parameters then just -ENOSYS ... */
3155 int sysctl_data(struct ctl_table
*table
,
3156 void __user
*oldval
, size_t __user
*oldlenp
,
3157 void __user
*newval
, size_t newlen
)
3162 int sysctl_string(struct ctl_table
*table
,
3163 void __user
*oldval
, size_t __user
*oldlenp
,
3164 void __user
*newval
, size_t newlen
)
3169 int sysctl_intvec(struct ctl_table
*table
,
3170 void __user
*oldval
, size_t __user
*oldlenp
,
3171 void __user
*newval
, size_t newlen
)
3176 int sysctl_jiffies(struct ctl_table
*table
,
3177 void __user
*oldval
, size_t __user
*oldlenp
,
3178 void __user
*newval
, size_t newlen
)
3183 int sysctl_ms_jiffies(struct ctl_table
*table
,
3184 void __user
*oldval
, size_t __user
*oldlenp
,
3185 void __user
*newval
, size_t newlen
)
3190 #endif /* CONFIG_SYSCTL_SYSCALL */
3192 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
3194 static int msg_count
;
3195 int name
[CTL_MAXNAME
];
3198 /* Check args->nlen. */
3199 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
3202 /* Read in the sysctl name for better debug message logging */
3203 for (i
= 0; i
< args
->nlen
; i
++)
3204 if (get_user(name
[i
], args
->name
+ i
))
3207 /* Ignore accesses to kernel.version */
3208 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
3211 if (msg_count
< 5) {
3214 "warning: process `%s' used the deprecated sysctl "
3215 "system call with ", current
->comm
);
3216 for (i
= 0; i
< args
->nlen
; i
++)
3217 printk("%d.", name
[i
]);
3224 * No sense putting this after each symbol definition, twice,
3225 * exception granted :-)
3227 EXPORT_SYMBOL(proc_dointvec
);
3228 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3229 EXPORT_SYMBOL(proc_dointvec_minmax
);
3230 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3231 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3232 EXPORT_SYMBOL(proc_dostring
);
3233 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3234 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3235 EXPORT_SYMBOL(register_sysctl_table
);
3236 EXPORT_SYMBOL(register_sysctl_paths
);
3237 EXPORT_SYMBOL(sysctl_intvec
);
3238 EXPORT_SYMBOL(sysctl_jiffies
);
3239 EXPORT_SYMBOL(sysctl_ms_jiffies
);
3240 EXPORT_SYMBOL(sysctl_string
);
3241 EXPORT_SYMBOL(sysctl_data
);
3242 EXPORT_SYMBOL(unregister_sysctl_table
);