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/kmemcheck.h>
31 #include <linux/smp_lock.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_counter.h>
55 #include <asm/uaccess.h>
56 #include <asm/processor.h>
60 #include <asm/stacktrace.h>
64 static int deprecated_sysctl_warning(struct __sysctl_args
*args
);
66 #if defined(CONFIG_SYSCTL)
68 /* External variables not in a header file. */
70 extern int print_fatal_signals
;
71 extern int sysctl_overcommit_memory
;
72 extern int sysctl_overcommit_ratio
;
73 extern int sysctl_panic_on_oom
;
74 extern int sysctl_oom_kill_allocating_task
;
75 extern int sysctl_oom_dump_tasks
;
76 extern int max_threads
;
77 extern int core_uses_pid
;
78 extern int suid_dumpable
;
79 extern char core_pattern
[];
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 */
94 extern int blk_iopoll_enabled
;
96 /* Constants used for minimum and maximum */
97 #ifdef CONFIG_DETECT_SOFTLOCKUP
98 static int sixty
= 60;
99 static int neg_one
= -1;
103 static int __maybe_unused one
= 1;
104 static int __maybe_unused two
= 2;
105 static unsigned long one_ul
= 1;
106 static int one_hundred
= 100;
108 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
109 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
111 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
112 static int maxolduid
= 65535;
113 static int minolduid
;
114 static int min_percpu_pagelist_fract
= 8;
116 static int ngroups_max
= NGROUPS_MAX
;
118 #ifdef CONFIG_MODULES
119 extern char modprobe_path
[];
120 extern int modules_disabled
;
122 #ifdef CONFIG_CHR_DEV_SG
123 extern int sg_big_buff
;
127 #include <asm/system.h>
130 #ifdef CONFIG_SPARC64
131 extern int sysctl_tsb_ratio
;
135 extern int pwrsw_enabled
;
136 extern int unaligned_enabled
;
140 #ifdef CONFIG_MATHEMU
141 extern int sysctl_ieee_emulation_warnings
;
143 extern int sysctl_userprocess_debug
;
144 extern int spin_retry
;
147 #ifdef CONFIG_BSD_PROCESS_ACCT
148 extern int acct_parm
[];
152 extern int no_unaligned_warning
;
153 extern int unaligned_dump_stack
;
156 #ifdef CONFIG_RT_MUTEXES
157 extern int max_lock_depth
;
160 #ifdef CONFIG_PROC_SYSCTL
161 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
162 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
163 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
164 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
167 static struct ctl_table root_table
[];
168 static struct ctl_table_root sysctl_table_root
;
169 static struct ctl_table_header root_table_header
= {
171 .ctl_table
= root_table
,
172 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.default_set
.list
),
173 .root
= &sysctl_table_root
,
174 .set
= &sysctl_table_root
.default_set
,
176 static struct ctl_table_root sysctl_table_root
= {
177 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
178 .default_set
.list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
181 static struct ctl_table kern_table
[];
182 static struct ctl_table vm_table
[];
183 static struct ctl_table fs_table
[];
184 static struct ctl_table debug_table
[];
185 static struct ctl_table dev_table
[];
186 extern struct ctl_table random_table
[];
187 #ifdef CONFIG_INOTIFY_USER
188 extern struct ctl_table inotify_table
[];
191 extern struct ctl_table epoll_table
[];
194 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
195 int sysctl_legacy_va_layout
;
198 extern int prove_locking
;
199 extern int lock_stat
;
201 /* The default sysctl tables: */
203 static struct ctl_table root_table
[] = {
205 .ctl_name
= CTL_KERN
,
206 .procname
= "kernel",
223 .ctl_name
= CTL_DEBUG
,
226 .child
= debug_table
,
235 * NOTE: do not add new entries to this table unless you have read
236 * Documentation/sysctl/ctl_unnumbered.txt
241 #ifdef CONFIG_SCHED_DEBUG
242 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
243 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
244 static int min_wakeup_granularity_ns
; /* 0 usecs */
245 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
248 static struct ctl_table kern_table
[] = {
250 .ctl_name
= CTL_UNNUMBERED
,
251 .procname
= "sched_child_runs_first",
252 .data
= &sysctl_sched_child_runs_first
,
253 .maxlen
= sizeof(unsigned int),
255 .proc_handler
= &proc_dointvec
,
257 #ifdef CONFIG_SCHED_DEBUG
259 .ctl_name
= CTL_UNNUMBERED
,
260 .procname
= "sched_min_granularity_ns",
261 .data
= &sysctl_sched_min_granularity
,
262 .maxlen
= sizeof(unsigned int),
264 .proc_handler
= &sched_nr_latency_handler
,
265 .strategy
= &sysctl_intvec
,
266 .extra1
= &min_sched_granularity_ns
,
267 .extra2
= &max_sched_granularity_ns
,
270 .ctl_name
= CTL_UNNUMBERED
,
271 .procname
= "sched_latency_ns",
272 .data
= &sysctl_sched_latency
,
273 .maxlen
= sizeof(unsigned int),
275 .proc_handler
= &sched_nr_latency_handler
,
276 .strategy
= &sysctl_intvec
,
277 .extra1
= &min_sched_granularity_ns
,
278 .extra2
= &max_sched_granularity_ns
,
281 .ctl_name
= CTL_UNNUMBERED
,
282 .procname
= "sched_wakeup_granularity_ns",
283 .data
= &sysctl_sched_wakeup_granularity
,
284 .maxlen
= sizeof(unsigned int),
286 .proc_handler
= &proc_dointvec_minmax
,
287 .strategy
= &sysctl_intvec
,
288 .extra1
= &min_wakeup_granularity_ns
,
289 .extra2
= &max_wakeup_granularity_ns
,
292 .ctl_name
= CTL_UNNUMBERED
,
293 .procname
= "sched_shares_ratelimit",
294 .data
= &sysctl_sched_shares_ratelimit
,
295 .maxlen
= sizeof(unsigned int),
297 .proc_handler
= &proc_dointvec
,
300 .ctl_name
= CTL_UNNUMBERED
,
301 .procname
= "sched_shares_thresh",
302 .data
= &sysctl_sched_shares_thresh
,
303 .maxlen
= sizeof(unsigned int),
305 .proc_handler
= &proc_dointvec_minmax
,
306 .strategy
= &sysctl_intvec
,
310 .ctl_name
= CTL_UNNUMBERED
,
311 .procname
= "sched_features",
312 .data
= &sysctl_sched_features
,
313 .maxlen
= sizeof(unsigned int),
315 .proc_handler
= &proc_dointvec
,
318 .ctl_name
= CTL_UNNUMBERED
,
319 .procname
= "sched_migration_cost",
320 .data
= &sysctl_sched_migration_cost
,
321 .maxlen
= sizeof(unsigned int),
323 .proc_handler
= &proc_dointvec
,
326 .ctl_name
= CTL_UNNUMBERED
,
327 .procname
= "sched_nr_migrate",
328 .data
= &sysctl_sched_nr_migrate
,
329 .maxlen
= sizeof(unsigned int),
331 .proc_handler
= &proc_dointvec
,
334 .ctl_name
= CTL_UNNUMBERED
,
335 .procname
= "sched_time_avg",
336 .data
= &sysctl_sched_time_avg
,
337 .maxlen
= sizeof(unsigned int),
339 .proc_handler
= &proc_dointvec
,
342 .ctl_name
= CTL_UNNUMBERED
,
343 .procname
= "timer_migration",
344 .data
= &sysctl_timer_migration
,
345 .maxlen
= sizeof(unsigned int),
347 .proc_handler
= &proc_dointvec_minmax
,
348 .strategy
= &sysctl_intvec
,
354 .ctl_name
= CTL_UNNUMBERED
,
355 .procname
= "sched_rt_period_us",
356 .data
= &sysctl_sched_rt_period
,
357 .maxlen
= sizeof(unsigned int),
359 .proc_handler
= &sched_rt_handler
,
362 .ctl_name
= CTL_UNNUMBERED
,
363 .procname
= "sched_rt_runtime_us",
364 .data
= &sysctl_sched_rt_runtime
,
365 .maxlen
= sizeof(int),
367 .proc_handler
= &sched_rt_handler
,
370 .ctl_name
= CTL_UNNUMBERED
,
371 .procname
= "sched_compat_yield",
372 .data
= &sysctl_sched_compat_yield
,
373 .maxlen
= sizeof(unsigned int),
375 .proc_handler
= &proc_dointvec
,
377 #ifdef CONFIG_PROVE_LOCKING
379 .ctl_name
= CTL_UNNUMBERED
,
380 .procname
= "prove_locking",
381 .data
= &prove_locking
,
382 .maxlen
= sizeof(int),
384 .proc_handler
= &proc_dointvec
,
387 #ifdef CONFIG_LOCK_STAT
389 .ctl_name
= CTL_UNNUMBERED
,
390 .procname
= "lock_stat",
392 .maxlen
= sizeof(int),
394 .proc_handler
= &proc_dointvec
,
398 .ctl_name
= KERN_PANIC
,
400 .data
= &panic_timeout
,
401 .maxlen
= sizeof(int),
403 .proc_handler
= &proc_dointvec
,
406 .ctl_name
= KERN_CORE_USES_PID
,
407 .procname
= "core_uses_pid",
408 .data
= &core_uses_pid
,
409 .maxlen
= sizeof(int),
411 .proc_handler
= &proc_dointvec
,
414 .ctl_name
= KERN_CORE_PATTERN
,
415 .procname
= "core_pattern",
416 .data
= core_pattern
,
417 .maxlen
= CORENAME_MAX_SIZE
,
419 .proc_handler
= &proc_dostring
,
420 .strategy
= &sysctl_string
,
422 #ifdef CONFIG_PROC_SYSCTL
424 .procname
= "tainted",
425 .maxlen
= sizeof(long),
427 .proc_handler
= &proc_taint
,
430 #ifdef CONFIG_LATENCYTOP
432 .procname
= "latencytop",
433 .data
= &latencytop_enabled
,
434 .maxlen
= sizeof(int),
436 .proc_handler
= &proc_dointvec
,
439 #ifdef CONFIG_BLK_DEV_INITRD
441 .ctl_name
= KERN_REALROOTDEV
,
442 .procname
= "real-root-dev",
443 .data
= &real_root_dev
,
444 .maxlen
= sizeof(int),
446 .proc_handler
= &proc_dointvec
,
450 .ctl_name
= CTL_UNNUMBERED
,
451 .procname
= "print-fatal-signals",
452 .data
= &print_fatal_signals
,
453 .maxlen
= sizeof(int),
455 .proc_handler
= &proc_dointvec
,
459 .ctl_name
= KERN_SPARC_REBOOT
,
460 .procname
= "reboot-cmd",
461 .data
= reboot_command
,
464 .proc_handler
= &proc_dostring
,
465 .strategy
= &sysctl_string
,
468 .ctl_name
= KERN_SPARC_STOP_A
,
469 .procname
= "stop-a",
470 .data
= &stop_a_enabled
,
471 .maxlen
= sizeof (int),
473 .proc_handler
= &proc_dointvec
,
476 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
477 .procname
= "scons-poweroff",
478 .data
= &scons_pwroff
,
479 .maxlen
= sizeof (int),
481 .proc_handler
= &proc_dointvec
,
484 #ifdef CONFIG_SPARC64
486 .ctl_name
= CTL_UNNUMBERED
,
487 .procname
= "tsb-ratio",
488 .data
= &sysctl_tsb_ratio
,
489 .maxlen
= sizeof (int),
491 .proc_handler
= &proc_dointvec
,
496 .ctl_name
= KERN_HPPA_PWRSW
,
497 .procname
= "soft-power",
498 .data
= &pwrsw_enabled
,
499 .maxlen
= sizeof (int),
501 .proc_handler
= &proc_dointvec
,
504 .ctl_name
= KERN_HPPA_UNALIGNED
,
505 .procname
= "unaligned-trap",
506 .data
= &unaligned_enabled
,
507 .maxlen
= sizeof (int),
509 .proc_handler
= &proc_dointvec
,
513 .ctl_name
= KERN_CTLALTDEL
,
514 .procname
= "ctrl-alt-del",
516 .maxlen
= sizeof(int),
518 .proc_handler
= &proc_dointvec
,
520 #ifdef CONFIG_FUNCTION_TRACER
522 .ctl_name
= CTL_UNNUMBERED
,
523 .procname
= "ftrace_enabled",
524 .data
= &ftrace_enabled
,
525 .maxlen
= sizeof(int),
527 .proc_handler
= &ftrace_enable_sysctl
,
530 #ifdef CONFIG_STACK_TRACER
532 .ctl_name
= CTL_UNNUMBERED
,
533 .procname
= "stack_tracer_enabled",
534 .data
= &stack_tracer_enabled
,
535 .maxlen
= sizeof(int),
537 .proc_handler
= &stack_trace_sysctl
,
540 #ifdef CONFIG_TRACING
542 .ctl_name
= CTL_UNNUMBERED
,
543 .procname
= "ftrace_dump_on_oops",
544 .data
= &ftrace_dump_on_oops
,
545 .maxlen
= sizeof(int),
547 .proc_handler
= &proc_dointvec
,
550 #ifdef CONFIG_MODULES
552 .ctl_name
= KERN_MODPROBE
,
553 .procname
= "modprobe",
554 .data
= &modprobe_path
,
555 .maxlen
= KMOD_PATH_LEN
,
557 .proc_handler
= &proc_dostring
,
558 .strategy
= &sysctl_string
,
561 .ctl_name
= CTL_UNNUMBERED
,
562 .procname
= "modules_disabled",
563 .data
= &modules_disabled
,
564 .maxlen
= sizeof(int),
566 /* only handle a transition from default "0" to "1" */
567 .proc_handler
= &proc_dointvec_minmax
,
572 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
574 .ctl_name
= KERN_HOTPLUG
,
575 .procname
= "hotplug",
576 .data
= &uevent_helper
,
577 .maxlen
= UEVENT_HELPER_PATH_LEN
,
579 .proc_handler
= &proc_dostring
,
580 .strategy
= &sysctl_string
,
583 #ifdef CONFIG_CHR_DEV_SG
585 .ctl_name
= KERN_SG_BIG_BUFF
,
586 .procname
= "sg-big-buff",
587 .data
= &sg_big_buff
,
588 .maxlen
= sizeof (int),
590 .proc_handler
= &proc_dointvec
,
593 #ifdef CONFIG_BSD_PROCESS_ACCT
595 .ctl_name
= KERN_ACCT
,
598 .maxlen
= 3*sizeof(int),
600 .proc_handler
= &proc_dointvec
,
603 #ifdef CONFIG_MAGIC_SYSRQ
605 .ctl_name
= KERN_SYSRQ
,
607 .data
= &__sysrq_enabled
,
608 .maxlen
= sizeof (int),
610 .proc_handler
= &proc_dointvec
,
613 #ifdef CONFIG_PROC_SYSCTL
615 .procname
= "cad_pid",
617 .maxlen
= sizeof (int),
619 .proc_handler
= &proc_do_cad_pid
,
623 .ctl_name
= KERN_MAX_THREADS
,
624 .procname
= "threads-max",
625 .data
= &max_threads
,
626 .maxlen
= sizeof(int),
628 .proc_handler
= &proc_dointvec
,
631 .ctl_name
= KERN_RANDOM
,
632 .procname
= "random",
634 .child
= random_table
,
637 .ctl_name
= KERN_OVERFLOWUID
,
638 .procname
= "overflowuid",
639 .data
= &overflowuid
,
640 .maxlen
= sizeof(int),
642 .proc_handler
= &proc_dointvec_minmax
,
643 .strategy
= &sysctl_intvec
,
644 .extra1
= &minolduid
,
645 .extra2
= &maxolduid
,
648 .ctl_name
= KERN_OVERFLOWGID
,
649 .procname
= "overflowgid",
650 .data
= &overflowgid
,
651 .maxlen
= sizeof(int),
653 .proc_handler
= &proc_dointvec_minmax
,
654 .strategy
= &sysctl_intvec
,
655 .extra1
= &minolduid
,
656 .extra2
= &maxolduid
,
659 #ifdef CONFIG_MATHEMU
661 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
662 .procname
= "ieee_emulation_warnings",
663 .data
= &sysctl_ieee_emulation_warnings
,
664 .maxlen
= sizeof(int),
666 .proc_handler
= &proc_dointvec
,
670 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
671 .procname
= "userprocess_debug",
672 .data
= &sysctl_userprocess_debug
,
673 .maxlen
= sizeof(int),
675 .proc_handler
= &proc_dointvec
,
679 .ctl_name
= KERN_PIDMAX
,
680 .procname
= "pid_max",
682 .maxlen
= sizeof (int),
684 .proc_handler
= &proc_dointvec_minmax
,
685 .strategy
= sysctl_intvec
,
686 .extra1
= &pid_max_min
,
687 .extra2
= &pid_max_max
,
690 .ctl_name
= KERN_PANIC_ON_OOPS
,
691 .procname
= "panic_on_oops",
692 .data
= &panic_on_oops
,
693 .maxlen
= sizeof(int),
695 .proc_handler
= &proc_dointvec
,
697 #if defined CONFIG_PRINTK
699 .ctl_name
= KERN_PRINTK
,
700 .procname
= "printk",
701 .data
= &console_loglevel
,
702 .maxlen
= 4*sizeof(int),
704 .proc_handler
= &proc_dointvec
,
707 .ctl_name
= KERN_PRINTK_RATELIMIT
,
708 .procname
= "printk_ratelimit",
709 .data
= &printk_ratelimit_state
.interval
,
710 .maxlen
= sizeof(int),
712 .proc_handler
= &proc_dointvec_jiffies
,
713 .strategy
= &sysctl_jiffies
,
716 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
717 .procname
= "printk_ratelimit_burst",
718 .data
= &printk_ratelimit_state
.burst
,
719 .maxlen
= sizeof(int),
721 .proc_handler
= &proc_dointvec
,
725 .ctl_name
= KERN_NGROUPS_MAX
,
726 .procname
= "ngroups_max",
727 .data
= &ngroups_max
,
728 .maxlen
= sizeof (int),
730 .proc_handler
= &proc_dointvec
,
732 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
734 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
735 .procname
= "unknown_nmi_panic",
736 .data
= &unknown_nmi_panic
,
737 .maxlen
= sizeof (int),
739 .proc_handler
= &proc_dointvec
,
742 .procname
= "nmi_watchdog",
743 .data
= &nmi_watchdog_enabled
,
744 .maxlen
= sizeof (int),
746 .proc_handler
= &proc_nmi_enabled
,
749 #if defined(CONFIG_X86)
751 .ctl_name
= KERN_PANIC_ON_NMI
,
752 .procname
= "panic_on_unrecovered_nmi",
753 .data
= &panic_on_unrecovered_nmi
,
754 .maxlen
= sizeof(int),
756 .proc_handler
= &proc_dointvec
,
759 .ctl_name
= CTL_UNNUMBERED
,
760 .procname
= "panic_on_io_nmi",
761 .data
= &panic_on_io_nmi
,
762 .maxlen
= sizeof(int),
764 .proc_handler
= &proc_dointvec
,
767 .ctl_name
= KERN_BOOTLOADER_TYPE
,
768 .procname
= "bootloader_type",
769 .data
= &bootloader_type
,
770 .maxlen
= sizeof (int),
772 .proc_handler
= &proc_dointvec
,
775 .ctl_name
= CTL_UNNUMBERED
,
776 .procname
= "bootloader_version",
777 .data
= &bootloader_version
,
778 .maxlen
= sizeof (int),
780 .proc_handler
= &proc_dointvec
,
783 .ctl_name
= CTL_UNNUMBERED
,
784 .procname
= "kstack_depth_to_print",
785 .data
= &kstack_depth_to_print
,
786 .maxlen
= sizeof(int),
788 .proc_handler
= &proc_dointvec
,
791 .ctl_name
= CTL_UNNUMBERED
,
792 .procname
= "io_delay_type",
793 .data
= &io_delay_type
,
794 .maxlen
= sizeof(int),
796 .proc_handler
= &proc_dointvec
,
799 #if defined(CONFIG_MMU)
801 .ctl_name
= KERN_RANDOMIZE
,
802 .procname
= "randomize_va_space",
803 .data
= &randomize_va_space
,
804 .maxlen
= sizeof(int),
806 .proc_handler
= &proc_dointvec
,
809 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
811 .ctl_name
= KERN_SPIN_RETRY
,
812 .procname
= "spin_retry",
814 .maxlen
= sizeof (int),
816 .proc_handler
= &proc_dointvec
,
819 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
821 .procname
= "acpi_video_flags",
822 .data
= &acpi_realmode_flags
,
823 .maxlen
= sizeof (unsigned long),
825 .proc_handler
= &proc_doulongvec_minmax
,
830 .ctl_name
= KERN_IA64_UNALIGNED
,
831 .procname
= "ignore-unaligned-usertrap",
832 .data
= &no_unaligned_warning
,
833 .maxlen
= sizeof (int),
835 .proc_handler
= &proc_dointvec
,
838 .ctl_name
= CTL_UNNUMBERED
,
839 .procname
= "unaligned-dump-stack",
840 .data
= &unaligned_dump_stack
,
841 .maxlen
= sizeof (int),
843 .proc_handler
= &proc_dointvec
,
846 #ifdef CONFIG_DETECT_SOFTLOCKUP
848 .ctl_name
= CTL_UNNUMBERED
,
849 .procname
= "softlockup_panic",
850 .data
= &softlockup_panic
,
851 .maxlen
= sizeof(int),
853 .proc_handler
= &proc_dointvec_minmax
,
854 .strategy
= &sysctl_intvec
,
859 .ctl_name
= CTL_UNNUMBERED
,
860 .procname
= "softlockup_thresh",
861 .data
= &softlockup_thresh
,
862 .maxlen
= sizeof(int),
864 .proc_handler
= &proc_dosoftlockup_thresh
,
865 .strategy
= &sysctl_intvec
,
870 #ifdef CONFIG_DETECT_HUNG_TASK
872 .ctl_name
= CTL_UNNUMBERED
,
873 .procname
= "hung_task_panic",
874 .data
= &sysctl_hung_task_panic
,
875 .maxlen
= sizeof(int),
877 .proc_handler
= &proc_dointvec_minmax
,
878 .strategy
= &sysctl_intvec
,
883 .ctl_name
= CTL_UNNUMBERED
,
884 .procname
= "hung_task_check_count",
885 .data
= &sysctl_hung_task_check_count
,
886 .maxlen
= sizeof(unsigned long),
888 .proc_handler
= &proc_doulongvec_minmax
,
889 .strategy
= &sysctl_intvec
,
892 .ctl_name
= CTL_UNNUMBERED
,
893 .procname
= "hung_task_timeout_secs",
894 .data
= &sysctl_hung_task_timeout_secs
,
895 .maxlen
= sizeof(unsigned long),
897 .proc_handler
= &proc_dohung_task_timeout_secs
,
898 .strategy
= &sysctl_intvec
,
901 .ctl_name
= CTL_UNNUMBERED
,
902 .procname
= "hung_task_warnings",
903 .data
= &sysctl_hung_task_warnings
,
904 .maxlen
= sizeof(unsigned long),
906 .proc_handler
= &proc_doulongvec_minmax
,
907 .strategy
= &sysctl_intvec
,
912 .ctl_name
= KERN_COMPAT_LOG
,
913 .procname
= "compat-log",
915 .maxlen
= sizeof (int),
917 .proc_handler
= &proc_dointvec
,
920 #ifdef CONFIG_RT_MUTEXES
922 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
923 .procname
= "max_lock_depth",
924 .data
= &max_lock_depth
,
925 .maxlen
= sizeof(int),
927 .proc_handler
= &proc_dointvec
,
931 .ctl_name
= CTL_UNNUMBERED
,
932 .procname
= "poweroff_cmd",
933 .data
= &poweroff_cmd
,
934 .maxlen
= POWEROFF_CMD_PATH_LEN
,
936 .proc_handler
= &proc_dostring
,
937 .strategy
= &sysctl_string
,
941 .ctl_name
= CTL_UNNUMBERED
,
944 .child
= key_sysctls
,
947 #ifdef CONFIG_RCU_TORTURE_TEST
949 .ctl_name
= CTL_UNNUMBERED
,
950 .procname
= "rcutorture_runnable",
951 .data
= &rcutorture_runnable
,
952 .maxlen
= sizeof(int),
954 .proc_handler
= &proc_dointvec
,
957 #ifdef CONFIG_SLOW_WORK
959 .ctl_name
= CTL_UNNUMBERED
,
960 .procname
= "slow-work",
962 .child
= slow_work_sysctls
,
965 #ifdef CONFIG_PERF_COUNTERS
967 .ctl_name
= CTL_UNNUMBERED
,
968 .procname
= "perf_counter_paranoid",
969 .data
= &sysctl_perf_counter_paranoid
,
970 .maxlen
= sizeof(sysctl_perf_counter_paranoid
),
972 .proc_handler
= &proc_dointvec
,
975 .ctl_name
= CTL_UNNUMBERED
,
976 .procname
= "perf_counter_mlock_kb",
977 .data
= &sysctl_perf_counter_mlock
,
978 .maxlen
= sizeof(sysctl_perf_counter_mlock
),
980 .proc_handler
= &proc_dointvec
,
983 .ctl_name
= CTL_UNNUMBERED
,
984 .procname
= "perf_counter_max_sample_rate",
985 .data
= &sysctl_perf_counter_sample_rate
,
986 .maxlen
= sizeof(sysctl_perf_counter_sample_rate
),
988 .proc_handler
= &proc_dointvec
,
991 #ifdef CONFIG_KMEMCHECK
993 .ctl_name
= CTL_UNNUMBERED
,
994 .procname
= "kmemcheck",
995 .data
= &kmemcheck_enabled
,
996 .maxlen
= sizeof(int),
998 .proc_handler
= &proc_dointvec
,
1002 .ctl_name
= CTL_UNNUMBERED
,
1003 .procname
= "blk_iopoll",
1004 .data
= &blk_iopoll_enabled
,
1005 .maxlen
= sizeof(int),
1007 .proc_handler
= &proc_dointvec
,
1010 * NOTE: do not add new entries to this table unless you have read
1011 * Documentation/sysctl/ctl_unnumbered.txt
1016 static struct ctl_table vm_table
[] = {
1018 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
1019 .procname
= "overcommit_memory",
1020 .data
= &sysctl_overcommit_memory
,
1021 .maxlen
= sizeof(sysctl_overcommit_memory
),
1023 .proc_handler
= &proc_dointvec
,
1026 .ctl_name
= VM_PANIC_ON_OOM
,
1027 .procname
= "panic_on_oom",
1028 .data
= &sysctl_panic_on_oom
,
1029 .maxlen
= sizeof(sysctl_panic_on_oom
),
1031 .proc_handler
= &proc_dointvec
,
1034 .ctl_name
= CTL_UNNUMBERED
,
1035 .procname
= "oom_kill_allocating_task",
1036 .data
= &sysctl_oom_kill_allocating_task
,
1037 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1039 .proc_handler
= &proc_dointvec
,
1042 .ctl_name
= CTL_UNNUMBERED
,
1043 .procname
= "oom_dump_tasks",
1044 .data
= &sysctl_oom_dump_tasks
,
1045 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1047 .proc_handler
= &proc_dointvec
,
1050 .ctl_name
= VM_OVERCOMMIT_RATIO
,
1051 .procname
= "overcommit_ratio",
1052 .data
= &sysctl_overcommit_ratio
,
1053 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1055 .proc_handler
= &proc_dointvec
,
1058 .ctl_name
= VM_PAGE_CLUSTER
,
1059 .procname
= "page-cluster",
1060 .data
= &page_cluster
,
1061 .maxlen
= sizeof(int),
1063 .proc_handler
= &proc_dointvec
,
1066 .ctl_name
= VM_DIRTY_BACKGROUND
,
1067 .procname
= "dirty_background_ratio",
1068 .data
= &dirty_background_ratio
,
1069 .maxlen
= sizeof(dirty_background_ratio
),
1071 .proc_handler
= &dirty_background_ratio_handler
,
1072 .strategy
= &sysctl_intvec
,
1074 .extra2
= &one_hundred
,
1077 .ctl_name
= CTL_UNNUMBERED
,
1078 .procname
= "dirty_background_bytes",
1079 .data
= &dirty_background_bytes
,
1080 .maxlen
= sizeof(dirty_background_bytes
),
1082 .proc_handler
= &dirty_background_bytes_handler
,
1083 .strategy
= &sysctl_intvec
,
1087 .ctl_name
= VM_DIRTY_RATIO
,
1088 .procname
= "dirty_ratio",
1089 .data
= &vm_dirty_ratio
,
1090 .maxlen
= sizeof(vm_dirty_ratio
),
1092 .proc_handler
= &dirty_ratio_handler
,
1093 .strategy
= &sysctl_intvec
,
1095 .extra2
= &one_hundred
,
1098 .ctl_name
= CTL_UNNUMBERED
,
1099 .procname
= "dirty_bytes",
1100 .data
= &vm_dirty_bytes
,
1101 .maxlen
= sizeof(vm_dirty_bytes
),
1103 .proc_handler
= &dirty_bytes_handler
,
1104 .strategy
= &sysctl_intvec
,
1105 .extra1
= &dirty_bytes_min
,
1108 .procname
= "dirty_writeback_centisecs",
1109 .data
= &dirty_writeback_interval
,
1110 .maxlen
= sizeof(dirty_writeback_interval
),
1112 .proc_handler
= &dirty_writeback_centisecs_handler
,
1115 .procname
= "dirty_expire_centisecs",
1116 .data
= &dirty_expire_interval
,
1117 .maxlen
= sizeof(dirty_expire_interval
),
1119 .proc_handler
= &proc_dointvec
,
1122 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
1123 .procname
= "nr_pdflush_threads",
1124 .data
= &nr_pdflush_threads
,
1125 .maxlen
= sizeof nr_pdflush_threads
,
1126 .mode
= 0444 /* read-only*/,
1127 .proc_handler
= &proc_dointvec
,
1130 .ctl_name
= VM_SWAPPINESS
,
1131 .procname
= "swappiness",
1132 .data
= &vm_swappiness
,
1133 .maxlen
= sizeof(vm_swappiness
),
1135 .proc_handler
= &proc_dointvec_minmax
,
1136 .strategy
= &sysctl_intvec
,
1138 .extra2
= &one_hundred
,
1140 #ifdef CONFIG_HUGETLB_PAGE
1142 .procname
= "nr_hugepages",
1144 .maxlen
= sizeof(unsigned long),
1146 .proc_handler
= &hugetlb_sysctl_handler
,
1147 .extra1
= (void *)&hugetlb_zero
,
1148 .extra2
= (void *)&hugetlb_infinity
,
1151 .ctl_name
= VM_HUGETLB_GROUP
,
1152 .procname
= "hugetlb_shm_group",
1153 .data
= &sysctl_hugetlb_shm_group
,
1154 .maxlen
= sizeof(gid_t
),
1156 .proc_handler
= &proc_dointvec
,
1159 .ctl_name
= CTL_UNNUMBERED
,
1160 .procname
= "hugepages_treat_as_movable",
1161 .data
= &hugepages_treat_as_movable
,
1162 .maxlen
= sizeof(int),
1164 .proc_handler
= &hugetlb_treat_movable_handler
,
1167 .ctl_name
= CTL_UNNUMBERED
,
1168 .procname
= "nr_overcommit_hugepages",
1170 .maxlen
= sizeof(unsigned long),
1172 .proc_handler
= &hugetlb_overcommit_handler
,
1173 .extra1
= (void *)&hugetlb_zero
,
1174 .extra2
= (void *)&hugetlb_infinity
,
1178 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
1179 .procname
= "lowmem_reserve_ratio",
1180 .data
= &sysctl_lowmem_reserve_ratio
,
1181 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1183 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
1184 .strategy
= &sysctl_intvec
,
1187 .ctl_name
= VM_DROP_PAGECACHE
,
1188 .procname
= "drop_caches",
1189 .data
= &sysctl_drop_caches
,
1190 .maxlen
= sizeof(int),
1192 .proc_handler
= drop_caches_sysctl_handler
,
1193 .strategy
= &sysctl_intvec
,
1196 .ctl_name
= VM_MIN_FREE_KBYTES
,
1197 .procname
= "min_free_kbytes",
1198 .data
= &min_free_kbytes
,
1199 .maxlen
= sizeof(min_free_kbytes
),
1201 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1202 .strategy
= &sysctl_intvec
,
1206 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1207 .procname
= "percpu_pagelist_fraction",
1208 .data
= &percpu_pagelist_fraction
,
1209 .maxlen
= sizeof(percpu_pagelist_fraction
),
1211 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1212 .strategy
= &sysctl_intvec
,
1213 .extra1
= &min_percpu_pagelist_fract
,
1217 .ctl_name
= VM_MAX_MAP_COUNT
,
1218 .procname
= "max_map_count",
1219 .data
= &sysctl_max_map_count
,
1220 .maxlen
= sizeof(sysctl_max_map_count
),
1222 .proc_handler
= &proc_dointvec
1226 .ctl_name
= CTL_UNNUMBERED
,
1227 .procname
= "nr_trim_pages",
1228 .data
= &sysctl_nr_trim_pages
,
1229 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1231 .proc_handler
= &proc_dointvec_minmax
,
1232 .strategy
= &sysctl_intvec
,
1237 .ctl_name
= VM_LAPTOP_MODE
,
1238 .procname
= "laptop_mode",
1239 .data
= &laptop_mode
,
1240 .maxlen
= sizeof(laptop_mode
),
1242 .proc_handler
= &proc_dointvec_jiffies
,
1243 .strategy
= &sysctl_jiffies
,
1246 .ctl_name
= VM_BLOCK_DUMP
,
1247 .procname
= "block_dump",
1248 .data
= &block_dump
,
1249 .maxlen
= sizeof(block_dump
),
1251 .proc_handler
= &proc_dointvec
,
1252 .strategy
= &sysctl_intvec
,
1256 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1257 .procname
= "vfs_cache_pressure",
1258 .data
= &sysctl_vfs_cache_pressure
,
1259 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1261 .proc_handler
= &proc_dointvec
,
1262 .strategy
= &sysctl_intvec
,
1265 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1267 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1268 .procname
= "legacy_va_layout",
1269 .data
= &sysctl_legacy_va_layout
,
1270 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1272 .proc_handler
= &proc_dointvec
,
1273 .strategy
= &sysctl_intvec
,
1279 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1280 .procname
= "zone_reclaim_mode",
1281 .data
= &zone_reclaim_mode
,
1282 .maxlen
= sizeof(zone_reclaim_mode
),
1284 .proc_handler
= &proc_dointvec
,
1285 .strategy
= &sysctl_intvec
,
1289 .ctl_name
= VM_MIN_UNMAPPED
,
1290 .procname
= "min_unmapped_ratio",
1291 .data
= &sysctl_min_unmapped_ratio
,
1292 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1294 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1295 .strategy
= &sysctl_intvec
,
1297 .extra2
= &one_hundred
,
1300 .ctl_name
= VM_MIN_SLAB
,
1301 .procname
= "min_slab_ratio",
1302 .data
= &sysctl_min_slab_ratio
,
1303 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1305 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1306 .strategy
= &sysctl_intvec
,
1308 .extra2
= &one_hundred
,
1313 .ctl_name
= CTL_UNNUMBERED
,
1314 .procname
= "stat_interval",
1315 .data
= &sysctl_stat_interval
,
1316 .maxlen
= sizeof(sysctl_stat_interval
),
1318 .proc_handler
= &proc_dointvec_jiffies
,
1319 .strategy
= &sysctl_jiffies
,
1323 .ctl_name
= CTL_UNNUMBERED
,
1324 .procname
= "mmap_min_addr",
1325 .data
= &dac_mmap_min_addr
,
1326 .maxlen
= sizeof(unsigned long),
1328 .proc_handler
= &mmap_min_addr_handler
,
1332 .ctl_name
= CTL_UNNUMBERED
,
1333 .procname
= "numa_zonelist_order",
1334 .data
= &numa_zonelist_order
,
1335 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1337 .proc_handler
= &numa_zonelist_order_handler
,
1338 .strategy
= &sysctl_string
,
1341 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1342 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1344 .ctl_name
= VM_VDSO_ENABLED
,
1345 .procname
= "vdso_enabled",
1346 .data
= &vdso_enabled
,
1347 .maxlen
= sizeof(vdso_enabled
),
1349 .proc_handler
= &proc_dointvec
,
1350 .strategy
= &sysctl_intvec
,
1354 #ifdef CONFIG_HIGHMEM
1356 .ctl_name
= CTL_UNNUMBERED
,
1357 .procname
= "highmem_is_dirtyable",
1358 .data
= &vm_highmem_is_dirtyable
,
1359 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1361 .proc_handler
= &proc_dointvec_minmax
,
1362 .strategy
= &sysctl_intvec
,
1368 .ctl_name
= CTL_UNNUMBERED
,
1369 .procname
= "scan_unevictable_pages",
1370 .data
= &scan_unevictable_pages
,
1371 .maxlen
= sizeof(scan_unevictable_pages
),
1373 .proc_handler
= &scan_unevictable_handler
,
1375 #ifdef CONFIG_MEMORY_FAILURE
1377 .ctl_name
= CTL_UNNUMBERED
,
1378 .procname
= "memory_failure_early_kill",
1379 .data
= &sysctl_memory_failure_early_kill
,
1380 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1382 .proc_handler
= &proc_dointvec_minmax
,
1383 .strategy
= &sysctl_intvec
,
1388 .ctl_name
= CTL_UNNUMBERED
,
1389 .procname
= "memory_failure_recovery",
1390 .data
= &sysctl_memory_failure_recovery
,
1391 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1393 .proc_handler
= &proc_dointvec_minmax
,
1394 .strategy
= &sysctl_intvec
,
1401 * NOTE: do not add new entries to this table unless you have read
1402 * Documentation/sysctl/ctl_unnumbered.txt
1407 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1408 static struct ctl_table binfmt_misc_table
[] = {
1413 static struct ctl_table fs_table
[] = {
1415 .ctl_name
= FS_NRINODE
,
1416 .procname
= "inode-nr",
1417 .data
= &inodes_stat
,
1418 .maxlen
= 2*sizeof(int),
1420 .proc_handler
= &proc_dointvec
,
1423 .ctl_name
= FS_STATINODE
,
1424 .procname
= "inode-state",
1425 .data
= &inodes_stat
,
1426 .maxlen
= 7*sizeof(int),
1428 .proc_handler
= &proc_dointvec
,
1431 .procname
= "file-nr",
1432 .data
= &files_stat
,
1433 .maxlen
= 3*sizeof(int),
1435 .proc_handler
= &proc_nr_files
,
1438 .ctl_name
= FS_MAXFILE
,
1439 .procname
= "file-max",
1440 .data
= &files_stat
.max_files
,
1441 .maxlen
= sizeof(int),
1443 .proc_handler
= &proc_dointvec
,
1446 .ctl_name
= CTL_UNNUMBERED
,
1447 .procname
= "nr_open",
1448 .data
= &sysctl_nr_open
,
1449 .maxlen
= sizeof(int),
1451 .proc_handler
= &proc_dointvec_minmax
,
1452 .extra1
= &sysctl_nr_open_min
,
1453 .extra2
= &sysctl_nr_open_max
,
1456 .ctl_name
= FS_DENTRY
,
1457 .procname
= "dentry-state",
1458 .data
= &dentry_stat
,
1459 .maxlen
= 6*sizeof(int),
1461 .proc_handler
= &proc_dointvec
,
1464 .ctl_name
= FS_OVERFLOWUID
,
1465 .procname
= "overflowuid",
1466 .data
= &fs_overflowuid
,
1467 .maxlen
= sizeof(int),
1469 .proc_handler
= &proc_dointvec_minmax
,
1470 .strategy
= &sysctl_intvec
,
1471 .extra1
= &minolduid
,
1472 .extra2
= &maxolduid
,
1475 .ctl_name
= FS_OVERFLOWGID
,
1476 .procname
= "overflowgid",
1477 .data
= &fs_overflowgid
,
1478 .maxlen
= sizeof(int),
1480 .proc_handler
= &proc_dointvec_minmax
,
1481 .strategy
= &sysctl_intvec
,
1482 .extra1
= &minolduid
,
1483 .extra2
= &maxolduid
,
1485 #ifdef CONFIG_FILE_LOCKING
1487 .ctl_name
= FS_LEASES
,
1488 .procname
= "leases-enable",
1489 .data
= &leases_enable
,
1490 .maxlen
= sizeof(int),
1492 .proc_handler
= &proc_dointvec
,
1495 #ifdef CONFIG_DNOTIFY
1497 .ctl_name
= FS_DIR_NOTIFY
,
1498 .procname
= "dir-notify-enable",
1499 .data
= &dir_notify_enable
,
1500 .maxlen
= sizeof(int),
1502 .proc_handler
= &proc_dointvec
,
1506 #ifdef CONFIG_FILE_LOCKING
1508 .ctl_name
= FS_LEASE_TIME
,
1509 .procname
= "lease-break-time",
1510 .data
= &lease_break_time
,
1511 .maxlen
= sizeof(int),
1513 .proc_handler
= &proc_dointvec
,
1518 .procname
= "aio-nr",
1520 .maxlen
= sizeof(aio_nr
),
1522 .proc_handler
= &proc_doulongvec_minmax
,
1525 .procname
= "aio-max-nr",
1526 .data
= &aio_max_nr
,
1527 .maxlen
= sizeof(aio_max_nr
),
1529 .proc_handler
= &proc_doulongvec_minmax
,
1531 #endif /* CONFIG_AIO */
1532 #ifdef CONFIG_INOTIFY_USER
1534 .ctl_name
= FS_INOTIFY
,
1535 .procname
= "inotify",
1537 .child
= inotify_table
,
1542 .procname
= "epoll",
1544 .child
= epoll_table
,
1549 .ctl_name
= KERN_SETUID_DUMPABLE
,
1550 .procname
= "suid_dumpable",
1551 .data
= &suid_dumpable
,
1552 .maxlen
= sizeof(int),
1554 .proc_handler
= &proc_dointvec_minmax
,
1555 .strategy
= &sysctl_intvec
,
1559 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1561 .ctl_name
= CTL_UNNUMBERED
,
1562 .procname
= "binfmt_misc",
1564 .child
= binfmt_misc_table
,
1568 * NOTE: do not add new entries to this table unless you have read
1569 * Documentation/sysctl/ctl_unnumbered.txt
1574 static struct ctl_table debug_table
[] = {
1575 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1577 .ctl_name
= CTL_UNNUMBERED
,
1578 .procname
= "exception-trace",
1579 .data
= &show_unhandled_signals
,
1580 .maxlen
= sizeof(int),
1582 .proc_handler
= proc_dointvec
1588 static struct ctl_table dev_table
[] = {
1592 static DEFINE_SPINLOCK(sysctl_lock
);
1594 /* called under sysctl_lock */
1595 static int use_table(struct ctl_table_header
*p
)
1597 if (unlikely(p
->unregistering
))
1603 /* called under sysctl_lock */
1604 static void unuse_table(struct ctl_table_header
*p
)
1607 if (unlikely(p
->unregistering
))
1608 complete(p
->unregistering
);
1611 /* called under sysctl_lock, will reacquire if has to wait */
1612 static void start_unregistering(struct ctl_table_header
*p
)
1615 * if p->used is 0, nobody will ever touch that entry again;
1616 * we'll eliminate all paths to it before dropping sysctl_lock
1618 if (unlikely(p
->used
)) {
1619 struct completion wait
;
1620 init_completion(&wait
);
1621 p
->unregistering
= &wait
;
1622 spin_unlock(&sysctl_lock
);
1623 wait_for_completion(&wait
);
1624 spin_lock(&sysctl_lock
);
1626 /* anything non-NULL; we'll never dereference it */
1627 p
->unregistering
= ERR_PTR(-EINVAL
);
1630 * do not remove from the list until nobody holds it; walking the
1631 * list in do_sysctl() relies on that.
1633 list_del_init(&p
->ctl_entry
);
1636 void sysctl_head_get(struct ctl_table_header
*head
)
1638 spin_lock(&sysctl_lock
);
1640 spin_unlock(&sysctl_lock
);
1643 void sysctl_head_put(struct ctl_table_header
*head
)
1645 spin_lock(&sysctl_lock
);
1648 spin_unlock(&sysctl_lock
);
1651 struct ctl_table_header
*sysctl_head_grab(struct ctl_table_header
*head
)
1655 spin_lock(&sysctl_lock
);
1656 if (!use_table(head
))
1657 head
= ERR_PTR(-ENOENT
);
1658 spin_unlock(&sysctl_lock
);
1662 void sysctl_head_finish(struct ctl_table_header
*head
)
1666 spin_lock(&sysctl_lock
);
1668 spin_unlock(&sysctl_lock
);
1671 static struct ctl_table_set
*
1672 lookup_header_set(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1674 struct ctl_table_set
*set
= &root
->default_set
;
1676 set
= root
->lookup(root
, namespaces
);
1680 static struct list_head
*
1681 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1683 struct ctl_table_set
*set
= lookup_header_set(root
, namespaces
);
1687 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1688 struct ctl_table_header
*prev
)
1690 struct ctl_table_root
*root
;
1691 struct list_head
*header_list
;
1692 struct ctl_table_header
*head
;
1693 struct list_head
*tmp
;
1695 spin_lock(&sysctl_lock
);
1698 tmp
= &prev
->ctl_entry
;
1702 tmp
= &root_table_header
.ctl_entry
;
1704 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1706 if (!use_table(head
))
1708 spin_unlock(&sysctl_lock
);
1713 header_list
= lookup_header_list(root
, namespaces
);
1714 if (tmp
!= header_list
)
1718 root
= list_entry(root
->root_list
.next
,
1719 struct ctl_table_root
, root_list
);
1720 if (root
== &sysctl_table_root
)
1722 header_list
= lookup_header_list(root
, namespaces
);
1723 } while (list_empty(header_list
));
1724 tmp
= header_list
->next
;
1727 spin_unlock(&sysctl_lock
);
1731 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1733 return __sysctl_head_next(current
->nsproxy
, prev
);
1736 void register_sysctl_root(struct ctl_table_root
*root
)
1738 spin_lock(&sysctl_lock
);
1739 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1740 spin_unlock(&sysctl_lock
);
1743 #ifdef CONFIG_SYSCTL_SYSCALL
1744 /* Perform the actual read/write of a sysctl table entry. */
1745 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1746 struct ctl_table
*table
,
1747 void __user
*oldval
, size_t __user
*oldlenp
,
1748 void __user
*newval
, size_t newlen
)
1756 if (sysctl_perm(root
, table
, op
))
1759 if (table
->strategy
) {
1760 rc
= table
->strategy(table
, oldval
, oldlenp
, newval
, newlen
);
1767 /* If there is no strategy routine, or if the strategy returns
1768 * zero, proceed with automatic r/w */
1769 if (table
->data
&& table
->maxlen
) {
1770 rc
= sysctl_data(table
, oldval
, oldlenp
, newval
, newlen
);
1777 static int parse_table(int __user
*name
, int nlen
,
1778 void __user
*oldval
, size_t __user
*oldlenp
,
1779 void __user
*newval
, size_t newlen
,
1780 struct ctl_table_root
*root
,
1781 struct ctl_table
*table
)
1787 if (get_user(n
, name
))
1789 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1790 if (!table
->ctl_name
)
1792 if (n
== table
->ctl_name
) {
1795 if (sysctl_perm(root
, table
, MAY_EXEC
))
1799 table
= table
->child
;
1802 error
= do_sysctl_strategy(root
, table
,
1811 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1812 void __user
*newval
, size_t newlen
)
1814 struct ctl_table_header
*head
;
1815 int error
= -ENOTDIR
;
1817 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1821 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1825 for (head
= sysctl_head_next(NULL
); head
;
1826 head
= sysctl_head_next(head
)) {
1827 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1829 head
->root
, head
->ctl_table
);
1830 if (error
!= -ENOTDIR
) {
1831 sysctl_head_finish(head
);
1838 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
1840 struct __sysctl_args tmp
;
1843 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1846 error
= deprecated_sysctl_warning(&tmp
);
1851 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1852 tmp
.newval
, tmp
.newlen
);
1857 #endif /* CONFIG_SYSCTL_SYSCALL */
1860 * sysctl_perm does NOT grant the superuser all rights automatically, because
1861 * some sysctl variables are readonly even to root.
1864 static int test_perm(int mode
, int op
)
1866 if (!current_euid())
1868 else if (in_egroup_p(0))
1870 if ((op
& ~mode
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
)) == 0)
1875 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1880 error
= security_sysctl(table
, op
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
));
1884 if (root
->permissions
)
1885 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1889 return test_perm(mode
, op
);
1892 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1894 for (; table
->ctl_name
|| table
->procname
; table
++) {
1895 table
->parent
= parent
;
1897 sysctl_set_parent(table
, table
->child
);
1901 static __init
int sysctl_init(void)
1903 sysctl_set_parent(NULL
, root_table
);
1904 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1907 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1913 core_initcall(sysctl_init
);
1915 static struct ctl_table
*is_branch_in(struct ctl_table
*branch
,
1916 struct ctl_table
*table
)
1918 struct ctl_table
*p
;
1919 const char *s
= branch
->procname
;
1921 /* branch should have named subdirectory as its first element */
1922 if (!s
|| !branch
->child
)
1925 /* ... and nothing else */
1926 if (branch
[1].procname
|| branch
[1].ctl_name
)
1929 /* table should contain subdirectory with the same name */
1930 for (p
= table
; p
->procname
|| p
->ctl_name
; p
++) {
1933 if (p
->procname
&& strcmp(p
->procname
, s
) == 0)
1939 /* see if attaching q to p would be an improvement */
1940 static void try_attach(struct ctl_table_header
*p
, struct ctl_table_header
*q
)
1942 struct ctl_table
*to
= p
->ctl_table
, *by
= q
->ctl_table
;
1943 struct ctl_table
*next
;
1945 int not_in_parent
= !p
->attached_by
;
1947 while ((next
= is_branch_in(by
, to
)) != NULL
) {
1948 if (by
== q
->attached_by
)
1950 if (to
== p
->attached_by
)
1956 if (is_better
&& not_in_parent
) {
1957 q
->attached_by
= by
;
1958 q
->attached_to
= to
;
1964 * __register_sysctl_paths - register a sysctl hierarchy
1965 * @root: List of sysctl headers to register on
1966 * @namespaces: Data to compute which lists of sysctl entries are visible
1967 * @path: The path to the directory the sysctl table is in.
1968 * @table: the top-level table structure
1970 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1971 * array. A completely 0 filled entry terminates the table.
1973 * The members of the &struct ctl_table structure are used as follows:
1975 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1976 * must be unique within that level of sysctl
1978 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1979 * enter a sysctl file
1981 * data - a pointer to data for use by proc_handler
1983 * maxlen - the maximum size in bytes of the data
1985 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1987 * child - a pointer to the child sysctl table if this entry is a directory, or
1990 * proc_handler - the text handler routine (described below)
1992 * strategy - the strategy routine (described below)
1994 * de - for internal use by the sysctl routines
1996 * extra1, extra2 - extra pointers usable by the proc handler routines
1998 * Leaf nodes in the sysctl tree will be represented by a single file
1999 * under /proc; non-leaf nodes will be represented by directories.
2001 * sysctl(2) can automatically manage read and write requests through
2002 * the sysctl table. The data and maxlen fields of the ctl_table
2003 * struct enable minimal validation of the values being written to be
2004 * performed, and the mode field allows minimal authentication.
2006 * More sophisticated management can be enabled by the provision of a
2007 * strategy routine with the table entry. This will be called before
2008 * any automatic read or write of the data is performed.
2010 * The strategy routine may return
2012 * < 0 - Error occurred (error is passed to user process)
2014 * 0 - OK - proceed with automatic read or write.
2016 * > 0 - OK - read or write has been done by the strategy routine, so
2017 * return immediately.
2019 * There must be a proc_handler routine for any terminal nodes
2020 * mirrored under /proc/sys (non-terminals are handled by a built-in
2021 * directory handler). Several default handlers are available to
2022 * cover common cases -
2024 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2025 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2026 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2028 * It is the handler's job to read the input buffer from user memory
2029 * and process it. The handler should return 0 on success.
2031 * This routine returns %NULL on a failure to register, and a pointer
2032 * to the table header on success.
2034 struct ctl_table_header
*__register_sysctl_paths(
2035 struct ctl_table_root
*root
,
2036 struct nsproxy
*namespaces
,
2037 const struct ctl_path
*path
, struct ctl_table
*table
)
2039 struct ctl_table_header
*header
;
2040 struct ctl_table
*new, **prevp
;
2041 unsigned int n
, npath
;
2042 struct ctl_table_set
*set
;
2044 /* Count the path components */
2045 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
2049 * For each path component, allocate a 2-element ctl_table array.
2050 * The first array element will be filled with the sysctl entry
2051 * for this, the second will be the sentinel (ctl_name == 0).
2053 * We allocate everything in one go so that we don't have to
2054 * worry about freeing additional memory in unregister_sysctl_table.
2056 header
= kzalloc(sizeof(struct ctl_table_header
) +
2057 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
2061 new = (struct ctl_table
*) (header
+ 1);
2063 /* Now connect the dots */
2064 prevp
= &header
->ctl_table
;
2065 for (n
= 0; n
< npath
; ++n
, ++path
) {
2066 /* Copy the procname */
2067 new->procname
= path
->procname
;
2068 new->ctl_name
= path
->ctl_name
;
2072 prevp
= &new->child
;
2077 header
->ctl_table_arg
= table
;
2079 INIT_LIST_HEAD(&header
->ctl_entry
);
2081 header
->unregistering
= NULL
;
2082 header
->root
= root
;
2083 sysctl_set_parent(NULL
, header
->ctl_table
);
2085 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2086 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
2091 spin_lock(&sysctl_lock
);
2092 header
->set
= lookup_header_set(root
, namespaces
);
2093 header
->attached_by
= header
->ctl_table
;
2094 header
->attached_to
= root_table
;
2095 header
->parent
= &root_table_header
;
2096 for (set
= header
->set
; set
; set
= set
->parent
) {
2097 struct ctl_table_header
*p
;
2098 list_for_each_entry(p
, &set
->list
, ctl_entry
) {
2099 if (p
->unregistering
)
2101 try_attach(p
, header
);
2104 header
->parent
->count
++;
2105 list_add_tail(&header
->ctl_entry
, &header
->set
->list
);
2106 spin_unlock(&sysctl_lock
);
2112 * register_sysctl_table_path - register a sysctl table hierarchy
2113 * @path: The path to the directory the sysctl table is in.
2114 * @table: the top-level table structure
2116 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2117 * array. A completely 0 filled entry terminates the table.
2119 * See __register_sysctl_paths for more details.
2121 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2122 struct ctl_table
*table
)
2124 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
2129 * register_sysctl_table - register a sysctl table hierarchy
2130 * @table: the top-level table structure
2132 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2133 * array. A completely 0 filled entry terminates the table.
2135 * See register_sysctl_paths for more details.
2137 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
2139 static const struct ctl_path null_path
[] = { {} };
2141 return register_sysctl_paths(null_path
, table
);
2145 * unregister_sysctl_table - unregister a sysctl table hierarchy
2146 * @header: the header returned from register_sysctl_table
2148 * Unregisters the sysctl table and all children. proc entries may not
2149 * actually be removed until they are no longer used by anyone.
2151 void unregister_sysctl_table(struct ctl_table_header
* header
)
2158 spin_lock(&sysctl_lock
);
2159 start_unregistering(header
);
2160 if (!--header
->parent
->count
) {
2162 kfree(header
->parent
);
2164 if (!--header
->count
)
2166 spin_unlock(&sysctl_lock
);
2169 int sysctl_is_seen(struct ctl_table_header
*p
)
2171 struct ctl_table_set
*set
= p
->set
;
2173 spin_lock(&sysctl_lock
);
2174 if (p
->unregistering
)
2176 else if (!set
->is_seen
)
2179 res
= set
->is_seen(set
);
2180 spin_unlock(&sysctl_lock
);
2184 void setup_sysctl_set(struct ctl_table_set
*p
,
2185 struct ctl_table_set
*parent
,
2186 int (*is_seen
)(struct ctl_table_set
*))
2188 INIT_LIST_HEAD(&p
->list
);
2189 p
->parent
= parent
? parent
: &sysctl_table_root
.default_set
;
2190 p
->is_seen
= is_seen
;
2193 #else /* !CONFIG_SYSCTL */
2194 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
2199 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
2200 struct ctl_table
*table
)
2205 void unregister_sysctl_table(struct ctl_table_header
* table
)
2209 void setup_sysctl_set(struct ctl_table_set
*p
,
2210 struct ctl_table_set
*parent
,
2211 int (*is_seen
)(struct ctl_table_set
*))
2215 void sysctl_head_put(struct ctl_table_header
*head
)
2219 #endif /* CONFIG_SYSCTL */
2225 #ifdef CONFIG_PROC_SYSCTL
2227 static int _proc_do_string(void* data
, int maxlen
, int write
,
2228 struct file
*filp
, void __user
*buffer
,
2229 size_t *lenp
, loff_t
*ppos
)
2235 if (!data
|| !maxlen
|| !*lenp
) {
2243 while (len
< *lenp
) {
2244 if (get_user(c
, p
++))
2246 if (c
== 0 || c
== '\n')
2252 if(copy_from_user(data
, buffer
, len
))
2254 ((char *) data
)[len
] = 0;
2272 if(copy_to_user(buffer
, data
, len
))
2275 if(put_user('\n', ((char __user
*) buffer
) + len
))
2286 * proc_dostring - read a string sysctl
2287 * @table: the sysctl table
2288 * @write: %TRUE if this is a write to the sysctl file
2289 * @filp: the file structure
2290 * @buffer: the user buffer
2291 * @lenp: the size of the user buffer
2292 * @ppos: file position
2294 * Reads/writes a string from/to the user buffer. If the kernel
2295 * buffer provided is not large enough to hold the string, the
2296 * string is truncated. The copied string is %NULL-terminated.
2297 * If the string is being read by the user process, it is copied
2298 * and a newline '\n' is added. It is truncated if the buffer is
2301 * Returns 0 on success.
2303 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2304 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2306 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
2307 buffer
, lenp
, ppos
);
2311 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
2313 int write
, void *data
)
2316 *valp
= *negp
? -*lvalp
: *lvalp
;
2321 *lvalp
= (unsigned long)-val
;
2324 *lvalp
= (unsigned long)val
;
2330 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2331 int write
, struct file
*filp
, void __user
*buffer
,
2332 size_t *lenp
, loff_t
*ppos
,
2333 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2334 int write
, void *data
),
2337 #define TMPBUFLEN 21
2338 int *i
, vleft
, first
= 1, neg
;
2342 char buf
[TMPBUFLEN
], *p
;
2343 char __user
*s
= buffer
;
2345 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
2346 (*ppos
&& !write
)) {
2351 i
= (int *) tbl_data
;
2352 vleft
= table
->maxlen
/ sizeof(*i
);
2356 conv
= do_proc_dointvec_conv
;
2358 for (; left
&& vleft
--; i
++, first
=0) {
2373 if (len
> sizeof(buf
) - 1)
2374 len
= sizeof(buf
) - 1;
2375 if (copy_from_user(buf
, s
, len
))
2379 if (*p
== '-' && left
> 1) {
2383 if (*p
< '0' || *p
> '9')
2386 lval
= simple_strtoul(p
, &p
, 0);
2389 if ((len
< left
) && *p
&& !isspace(*p
))
2394 if (conv(&neg
, &lval
, i
, 1, data
))
2401 if (conv(&neg
, &lval
, i
, 0, data
))
2404 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2408 if(copy_to_user(s
, buf
, len
))
2415 if (!write
&& !first
&& left
) {
2416 if(put_user('\n', s
))
2423 if (get_user(c
, s
++))
2438 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2439 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2440 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2441 int write
, void *data
),
2444 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2445 buffer
, lenp
, ppos
, conv
, data
);
2449 * proc_dointvec - read a vector of integers
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @filp: the file structure
2453 * @buffer: the user buffer
2454 * @lenp: the size of the user buffer
2455 * @ppos: file position
2457 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2458 * values from/to the user buffer, treated as an ASCII string.
2460 * Returns 0 on success.
2462 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2463 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2465 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2470 * Taint values can only be increased
2471 * This means we can safely use a temporary.
2473 static int proc_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2474 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2477 unsigned long tmptaint
= get_taint();
2480 if (write
&& !capable(CAP_SYS_ADMIN
))
2485 err
= proc_doulongvec_minmax(&t
, write
, filp
, buffer
, lenp
, ppos
);
2491 * Poor man's atomic or. Not worth adding a primitive
2492 * to everyone's atomic.h for this
2495 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2496 if ((tmptaint
>> i
) & 1)
2504 struct do_proc_dointvec_minmax_conv_param
{
2509 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2511 int write
, void *data
)
2513 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2515 int val
= *negp
? -*lvalp
: *lvalp
;
2516 if ((param
->min
&& *param
->min
> val
) ||
2517 (param
->max
&& *param
->max
< val
))
2524 *lvalp
= (unsigned long)-val
;
2527 *lvalp
= (unsigned long)val
;
2534 * proc_dointvec_minmax - read a vector of integers with min/max values
2535 * @table: the sysctl table
2536 * @write: %TRUE if this is a write to the sysctl file
2537 * @filp: the file structure
2538 * @buffer: the user buffer
2539 * @lenp: the size of the user buffer
2540 * @ppos: file position
2542 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2543 * values from/to the user buffer, treated as an ASCII string.
2545 * This routine will ensure the values are within the range specified by
2546 * table->extra1 (min) and table->extra2 (max).
2548 * Returns 0 on success.
2550 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2551 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2553 struct do_proc_dointvec_minmax_conv_param param
= {
2554 .min
= (int *) table
->extra1
,
2555 .max
= (int *) table
->extra2
,
2557 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2558 do_proc_dointvec_minmax_conv
, ¶m
);
2561 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2563 void __user
*buffer
,
2564 size_t *lenp
, loff_t
*ppos
,
2565 unsigned long convmul
,
2566 unsigned long convdiv
)
2568 #define TMPBUFLEN 21
2569 unsigned long *i
, *min
, *max
, val
;
2570 int vleft
, first
=1, neg
;
2572 char buf
[TMPBUFLEN
], *p
;
2573 char __user
*s
= buffer
;
2575 if (!data
|| !table
->maxlen
|| !*lenp
||
2576 (*ppos
&& !write
)) {
2581 i
= (unsigned long *) data
;
2582 min
= (unsigned long *) table
->extra1
;
2583 max
= (unsigned long *) table
->extra2
;
2584 vleft
= table
->maxlen
/ sizeof(unsigned long);
2587 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2602 if (len
> TMPBUFLEN
-1)
2604 if (copy_from_user(buf
, s
, len
))
2608 if (*p
== '-' && left
> 1) {
2612 if (*p
< '0' || *p
> '9')
2614 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2616 if ((len
< left
) && *p
&& !isspace(*p
))
2625 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2632 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2636 if(copy_to_user(s
, buf
, len
))
2643 if (!write
&& !first
&& left
) {
2644 if(put_user('\n', s
))
2651 if (get_user(c
, s
++))
2666 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2668 void __user
*buffer
,
2669 size_t *lenp
, loff_t
*ppos
,
2670 unsigned long convmul
,
2671 unsigned long convdiv
)
2673 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2674 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2678 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2679 * @table: the sysctl table
2680 * @write: %TRUE if this is a write to the sysctl file
2681 * @filp: the file structure
2682 * @buffer: the user buffer
2683 * @lenp: the size of the user buffer
2684 * @ppos: file position
2686 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2687 * values from/to the user buffer, treated as an ASCII string.
2689 * This routine will ensure the values are within the range specified by
2690 * table->extra1 (min) and table->extra2 (max).
2692 * Returns 0 on success.
2694 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2695 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2697 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2701 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2702 * @table: the sysctl table
2703 * @write: %TRUE if this is a write to the sysctl file
2704 * @filp: the file structure
2705 * @buffer: the user buffer
2706 * @lenp: the size of the user buffer
2707 * @ppos: file position
2709 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2710 * values from/to the user buffer, treated as an ASCII string. The values
2711 * are treated as milliseconds, and converted to jiffies when they are stored.
2713 * This routine will ensure the values are within the range specified by
2714 * table->extra1 (min) and table->extra2 (max).
2716 * Returns 0 on success.
2718 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2720 void __user
*buffer
,
2721 size_t *lenp
, loff_t
*ppos
)
2723 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2724 lenp
, ppos
, HZ
, 1000l);
2728 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2730 int write
, void *data
)
2733 if (*lvalp
> LONG_MAX
/ HZ
)
2735 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2741 lval
= (unsigned long)-val
;
2744 lval
= (unsigned long)val
;
2751 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2753 int write
, void *data
)
2756 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2758 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2764 lval
= (unsigned long)-val
;
2767 lval
= (unsigned long)val
;
2769 *lvalp
= jiffies_to_clock_t(lval
);
2774 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2776 int write
, void *data
)
2779 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2785 lval
= (unsigned long)-val
;
2788 lval
= (unsigned long)val
;
2790 *lvalp
= jiffies_to_msecs(lval
);
2796 * proc_dointvec_jiffies - read a vector of integers as seconds
2797 * @table: the sysctl table
2798 * @write: %TRUE if this is a write to the sysctl file
2799 * @filp: the file structure
2800 * @buffer: the user buffer
2801 * @lenp: the size of the user buffer
2802 * @ppos: file position
2804 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2805 * values from/to the user buffer, treated as an ASCII string.
2806 * The values read are assumed to be in seconds, and are converted into
2809 * Returns 0 on success.
2811 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2812 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2814 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2815 do_proc_dointvec_jiffies_conv
,NULL
);
2819 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2820 * @table: the sysctl table
2821 * @write: %TRUE if this is a write to the sysctl file
2822 * @filp: the file structure
2823 * @buffer: the user buffer
2824 * @lenp: the size of the user buffer
2825 * @ppos: pointer to the file position
2827 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2828 * values from/to the user buffer, treated as an ASCII string.
2829 * The values read are assumed to be in 1/USER_HZ seconds, and
2830 * are converted into jiffies.
2832 * Returns 0 on success.
2834 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2835 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2837 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2838 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2842 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2843 * @table: the sysctl table
2844 * @write: %TRUE if this is a write to the sysctl file
2845 * @filp: the file structure
2846 * @buffer: the user buffer
2847 * @lenp: the size of the user buffer
2848 * @ppos: file position
2849 * @ppos: the current position in the file
2851 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2852 * values from/to the user buffer, treated as an ASCII string.
2853 * The values read are assumed to be in 1/1000 seconds, and
2854 * are converted into jiffies.
2856 * Returns 0 on success.
2858 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2859 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2861 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2862 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2865 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2866 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2868 struct pid
*new_pid
;
2872 tmp
= pid_vnr(cad_pid
);
2874 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2875 lenp
, ppos
, NULL
, NULL
);
2879 new_pid
= find_get_pid(tmp
);
2883 put_pid(xchg(&cad_pid
, new_pid
));
2887 #else /* CONFIG_PROC_FS */
2889 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2890 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2895 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2896 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2901 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2902 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2907 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2908 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2913 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2914 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2919 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2920 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2925 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2926 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2931 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2933 void __user
*buffer
,
2934 size_t *lenp
, loff_t
*ppos
)
2940 #endif /* CONFIG_PROC_FS */
2943 #ifdef CONFIG_SYSCTL_SYSCALL
2945 * General sysctl support routines
2948 /* The generic sysctl data routine (used if no strategy routine supplied) */
2949 int sysctl_data(struct ctl_table
*table
,
2950 void __user
*oldval
, size_t __user
*oldlenp
,
2951 void __user
*newval
, size_t newlen
)
2955 /* Get out of I don't have a variable */
2956 if (!table
->data
|| !table
->maxlen
)
2959 if (oldval
&& oldlenp
) {
2960 if (get_user(len
, oldlenp
))
2963 if (len
> table
->maxlen
)
2964 len
= table
->maxlen
;
2965 if (copy_to_user(oldval
, table
->data
, len
))
2967 if (put_user(len
, oldlenp
))
2972 if (newval
&& newlen
) {
2973 if (newlen
> table
->maxlen
)
2974 newlen
= table
->maxlen
;
2976 if (copy_from_user(table
->data
, newval
, newlen
))
2982 /* The generic string strategy routine: */
2983 int sysctl_string(struct ctl_table
*table
,
2984 void __user
*oldval
, size_t __user
*oldlenp
,
2985 void __user
*newval
, size_t newlen
)
2987 if (!table
->data
|| !table
->maxlen
)
2990 if (oldval
&& oldlenp
) {
2992 if (get_user(bufsize
, oldlenp
))
2995 size_t len
= strlen(table
->data
), copied
;
2997 /* This shouldn't trigger for a well-formed sysctl */
2998 if (len
> table
->maxlen
)
2999 len
= table
->maxlen
;
3001 /* Copy up to a max of bufsize-1 bytes of the string */
3002 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
3004 if (copy_to_user(oldval
, table
->data
, copied
) ||
3005 put_user(0, (char __user
*)(oldval
+ copied
)))
3007 if (put_user(len
, oldlenp
))
3011 if (newval
&& newlen
) {
3012 size_t len
= newlen
;
3013 if (len
> table
->maxlen
)
3014 len
= table
->maxlen
;
3015 if(copy_from_user(table
->data
, newval
, len
))
3017 if (len
== table
->maxlen
)
3019 ((char *) table
->data
)[len
] = 0;
3025 * This function makes sure that all of the integers in the vector
3026 * are between the minimum and maximum values given in the arrays
3027 * table->extra1 and table->extra2, respectively.
3029 int sysctl_intvec(struct ctl_table
*table
,
3030 void __user
*oldval
, size_t __user
*oldlenp
,
3031 void __user
*newval
, size_t newlen
)
3034 if (newval
&& newlen
) {
3035 int __user
*vec
= (int __user
*) newval
;
3036 int *min
= (int *) table
->extra1
;
3037 int *max
= (int *) table
->extra2
;
3041 if (newlen
% sizeof(int) != 0)
3044 if (!table
->extra1
&& !table
->extra2
)
3047 if (newlen
> table
->maxlen
)
3048 newlen
= table
->maxlen
;
3049 length
= newlen
/ sizeof(int);
3051 for (i
= 0; i
< length
; i
++) {
3053 if (get_user(value
, vec
+ i
))
3055 if (min
&& value
< min
[i
])
3057 if (max
&& value
> max
[i
])
3064 /* Strategy function to convert jiffies to seconds */
3065 int sysctl_jiffies(struct ctl_table
*table
,
3066 void __user
*oldval
, size_t __user
*oldlenp
,
3067 void __user
*newval
, size_t newlen
)
3069 if (oldval
&& oldlenp
) {
3072 if (get_user(olen
, oldlenp
))
3077 if (olen
< sizeof(int))
3080 val
= *(int *)(table
->data
) / HZ
;
3081 if (put_user(val
, (int __user
*)oldval
))
3083 if (put_user(sizeof(int), oldlenp
))
3087 if (newval
&& newlen
) {
3089 if (newlen
!= sizeof(int))
3091 if (get_user(new, (int __user
*)newval
))
3093 *(int *)(table
->data
) = new*HZ
;
3098 /* Strategy function to convert jiffies to seconds */
3099 int sysctl_ms_jiffies(struct ctl_table
*table
,
3100 void __user
*oldval
, size_t __user
*oldlenp
,
3101 void __user
*newval
, size_t newlen
)
3103 if (oldval
&& oldlenp
) {
3106 if (get_user(olen
, oldlenp
))
3111 if (olen
< sizeof(int))
3114 val
= jiffies_to_msecs(*(int *)(table
->data
));
3115 if (put_user(val
, (int __user
*)oldval
))
3117 if (put_user(sizeof(int), oldlenp
))
3121 if (newval
&& newlen
) {
3123 if (newlen
!= sizeof(int))
3125 if (get_user(new, (int __user
*)newval
))
3127 *(int *)(table
->data
) = msecs_to_jiffies(new);
3134 #else /* CONFIG_SYSCTL_SYSCALL */
3137 SYSCALL_DEFINE1(sysctl
, struct __sysctl_args __user
*, args
)
3139 struct __sysctl_args tmp
;
3142 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
3145 error
= deprecated_sysctl_warning(&tmp
);
3147 /* If no error reading the parameters then just -ENOSYS ... */
3154 int sysctl_data(struct ctl_table
*table
,
3155 void __user
*oldval
, size_t __user
*oldlenp
,
3156 void __user
*newval
, size_t newlen
)
3161 int sysctl_string(struct ctl_table
*table
,
3162 void __user
*oldval
, size_t __user
*oldlenp
,
3163 void __user
*newval
, size_t newlen
)
3168 int sysctl_intvec(struct ctl_table
*table
,
3169 void __user
*oldval
, size_t __user
*oldlenp
,
3170 void __user
*newval
, size_t newlen
)
3175 int sysctl_jiffies(struct ctl_table
*table
,
3176 void __user
*oldval
, size_t __user
*oldlenp
,
3177 void __user
*newval
, size_t newlen
)
3182 int sysctl_ms_jiffies(struct ctl_table
*table
,
3183 void __user
*oldval
, size_t __user
*oldlenp
,
3184 void __user
*newval
, size_t newlen
)
3189 #endif /* CONFIG_SYSCTL_SYSCALL */
3191 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
3193 static int msg_count
;
3194 int name
[CTL_MAXNAME
];
3197 /* Check args->nlen. */
3198 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
3201 /* Read in the sysctl name for better debug message logging */
3202 for (i
= 0; i
< args
->nlen
; i
++)
3203 if (get_user(name
[i
], args
->name
+ i
))
3206 /* Ignore accesses to kernel.version */
3207 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
3210 if (msg_count
< 5) {
3213 "warning: process `%s' used the deprecated sysctl "
3214 "system call with ", current
->comm
);
3215 for (i
= 0; i
< args
->nlen
; i
++)
3216 printk("%d.", name
[i
]);
3223 * No sense putting this after each symbol definition, twice,
3224 * exception granted :-)
3226 EXPORT_SYMBOL(proc_dointvec
);
3227 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3228 EXPORT_SYMBOL(proc_dointvec_minmax
);
3229 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3230 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3231 EXPORT_SYMBOL(proc_dostring
);
3232 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3233 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3234 EXPORT_SYMBOL(register_sysctl_table
);
3235 EXPORT_SYMBOL(register_sysctl_paths
);
3236 EXPORT_SYMBOL(sysctl_intvec
);
3237 EXPORT_SYMBOL(sysctl_jiffies
);
3238 EXPORT_SYMBOL(sysctl_ms_jiffies
);
3239 EXPORT_SYMBOL(sysctl_string
);
3240 EXPORT_SYMBOL(sysctl_data
);
3241 EXPORT_SYMBOL(unregister_sysctl_table
);