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/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
65 #include <asm/uaccess.h>
66 #include <asm/processor.h>
70 #include <asm/stacktrace.h>
74 #include <asm/setup.h>
76 #ifdef CONFIG_BSD_PROCESS_ACCT
77 #include <linux/acct.h>
79 #ifdef CONFIG_RT_MUTEXES
80 #include <linux/rtmutex.h>
82 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
83 #include <linux/lockdep.h>
85 #ifdef CONFIG_CHR_DEV_SG
89 #ifdef CONFIG_LOCKUP_DETECTOR
90 #include <linux/nmi.h>
94 #if defined(CONFIG_SYSCTL)
96 /* External variables not in a header file. */
97 extern int sysctl_overcommit_memory
;
98 extern int sysctl_overcommit_ratio
;
99 extern int max_threads
;
100 extern int core_uses_pid
;
101 extern int suid_dumpable
;
102 extern char core_pattern
[];
103 extern unsigned int core_pipe_limit
;
105 extern int min_free_kbytes
;
106 extern int pid_max_min
, pid_max_max
;
107 extern int sysctl_drop_caches
;
108 extern int percpu_pagelist_fraction
;
109 extern int compat_log
;
110 extern int latencytop_enabled
;
111 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
113 extern int sysctl_nr_trim_pages
;
116 extern int blk_iopoll_enabled
;
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty
= 60;
122 static int neg_one
= -1;
126 static int __maybe_unused one
= 1;
127 static int __maybe_unused two
= 2;
128 static int __maybe_unused three
= 3;
129 static unsigned long one_ul
= 1;
130 static int one_hundred
= 100;
132 static int ten_thousand
= 10000;
135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
136 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
139 static int maxolduid
= 65535;
140 static int minolduid
;
141 static int min_percpu_pagelist_fract
= 8;
143 static int ngroups_max
= NGROUPS_MAX
;
144 static const int cap_last_cap
= CAP_LAST_CAP
;
146 #ifdef CONFIG_INOTIFY_USER
147 #include <linux/inotify.h>
152 #ifdef CONFIG_SPARC64
153 extern int sysctl_tsb_ratio
;
157 extern int pwrsw_enabled
;
158 extern int unaligned_enabled
;
162 extern int no_unaligned_warning
;
163 extern int unaligned_dump_stack
;
166 #ifdef CONFIG_PROC_SYSCTL
167 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
168 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
169 static int proc_taint(struct ctl_table
*table
, int write
,
170 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
174 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
175 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
178 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
179 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
180 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
181 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
183 #ifdef CONFIG_MAGIC_SYSRQ
184 /* Note: sysrq code uses it's own private copy */
185 static int __sysrq_enabled
= SYSRQ_DEFAULT_ENABLE
;
187 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
188 void __user
*buffer
, size_t *lenp
,
193 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
198 sysrq_toggle_support(__sysrq_enabled
);
205 static struct ctl_table kern_table
[];
206 static struct ctl_table vm_table
[];
207 static struct ctl_table fs_table
[];
208 static struct ctl_table debug_table
[];
209 static struct ctl_table dev_table
[];
210 extern struct ctl_table random_table
[];
212 extern struct ctl_table epoll_table
[];
215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
216 int sysctl_legacy_va_layout
;
219 /* The default sysctl tables: */
221 static struct ctl_table sysctl_base_table
[] = {
223 .procname
= "kernel",
240 .child
= debug_table
,
250 #ifdef CONFIG_SCHED_DEBUG
251 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
252 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
253 static int min_wakeup_granularity_ns
; /* 0 usecs */
254 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
255 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
256 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
259 #ifdef CONFIG_COMPACTION
260 static int min_extfrag_threshold
;
261 static int max_extfrag_threshold
= 1000;
264 static struct ctl_table kern_table
[] = {
266 .procname
= "sched_child_runs_first",
267 .data
= &sysctl_sched_child_runs_first
,
268 .maxlen
= sizeof(unsigned int),
270 .proc_handler
= proc_dointvec
,
272 #ifdef CONFIG_SCHED_DEBUG
274 .procname
= "sched_min_granularity_ns",
275 .data
= &sysctl_sched_min_granularity
,
276 .maxlen
= sizeof(unsigned int),
278 .proc_handler
= sched_proc_update_handler
,
279 .extra1
= &min_sched_granularity_ns
,
280 .extra2
= &max_sched_granularity_ns
,
283 .procname
= "sched_latency_ns",
284 .data
= &sysctl_sched_latency
,
285 .maxlen
= sizeof(unsigned int),
287 .proc_handler
= sched_proc_update_handler
,
288 .extra1
= &min_sched_granularity_ns
,
289 .extra2
= &max_sched_granularity_ns
,
292 .procname
= "sched_wakeup_granularity_ns",
293 .data
= &sysctl_sched_wakeup_granularity
,
294 .maxlen
= sizeof(unsigned int),
296 .proc_handler
= sched_proc_update_handler
,
297 .extra1
= &min_wakeup_granularity_ns
,
298 .extra2
= &max_wakeup_granularity_ns
,
301 .procname
= "sched_tunable_scaling",
302 .data
= &sysctl_sched_tunable_scaling
,
303 .maxlen
= sizeof(enum sched_tunable_scaling
),
305 .proc_handler
= sched_proc_update_handler
,
306 .extra1
= &min_sched_tunable_scaling
,
307 .extra2
= &max_sched_tunable_scaling
,
310 .procname
= "sched_migration_cost",
311 .data
= &sysctl_sched_migration_cost
,
312 .maxlen
= sizeof(unsigned int),
314 .proc_handler
= proc_dointvec
,
317 .procname
= "sched_nr_migrate",
318 .data
= &sysctl_sched_nr_migrate
,
319 .maxlen
= sizeof(unsigned int),
321 .proc_handler
= proc_dointvec
,
324 .procname
= "sched_time_avg",
325 .data
= &sysctl_sched_time_avg
,
326 .maxlen
= sizeof(unsigned int),
328 .proc_handler
= proc_dointvec
,
331 .procname
= "sched_shares_window",
332 .data
= &sysctl_sched_shares_window
,
333 .maxlen
= sizeof(unsigned int),
335 .proc_handler
= proc_dointvec
,
338 .procname
= "timer_migration",
339 .data
= &sysctl_timer_migration
,
340 .maxlen
= sizeof(unsigned int),
342 .proc_handler
= proc_dointvec_minmax
,
348 .procname
= "sched_rt_period_us",
349 .data
= &sysctl_sched_rt_period
,
350 .maxlen
= sizeof(unsigned int),
352 .proc_handler
= sched_rt_handler
,
355 .procname
= "sched_rt_runtime_us",
356 .data
= &sysctl_sched_rt_runtime
,
357 .maxlen
= sizeof(int),
359 .proc_handler
= sched_rt_handler
,
361 #ifdef CONFIG_SCHED_AUTOGROUP
363 .procname
= "sched_autogroup_enabled",
364 .data
= &sysctl_sched_autogroup_enabled
,
365 .maxlen
= sizeof(unsigned int),
367 .proc_handler
= proc_dointvec_minmax
,
372 #ifdef CONFIG_CFS_BANDWIDTH
374 .procname
= "sched_cfs_bandwidth_slice_us",
375 .data
= &sysctl_sched_cfs_bandwidth_slice
,
376 .maxlen
= sizeof(unsigned int),
378 .proc_handler
= proc_dointvec_minmax
,
382 #ifdef CONFIG_PROVE_LOCKING
384 .procname
= "prove_locking",
385 .data
= &prove_locking
,
386 .maxlen
= sizeof(int),
388 .proc_handler
= proc_dointvec
,
391 #ifdef CONFIG_LOCK_STAT
393 .procname
= "lock_stat",
395 .maxlen
= sizeof(int),
397 .proc_handler
= proc_dointvec
,
402 .data
= &panic_timeout
,
403 .maxlen
= sizeof(int),
405 .proc_handler
= proc_dointvec
,
408 .procname
= "core_uses_pid",
409 .data
= &core_uses_pid
,
410 .maxlen
= sizeof(int),
412 .proc_handler
= proc_dointvec
,
415 .procname
= "core_pattern",
416 .data
= core_pattern
,
417 .maxlen
= CORENAME_MAX_SIZE
,
419 .proc_handler
= proc_dostring_coredump
,
422 .procname
= "core_pipe_limit",
423 .data
= &core_pipe_limit
,
424 .maxlen
= sizeof(unsigned int),
426 .proc_handler
= proc_dointvec
,
428 #ifdef CONFIG_PROC_SYSCTL
430 .procname
= "tainted",
431 .maxlen
= sizeof(long),
433 .proc_handler
= proc_taint
,
436 #ifdef CONFIG_LATENCYTOP
438 .procname
= "latencytop",
439 .data
= &latencytop_enabled
,
440 .maxlen
= sizeof(int),
442 .proc_handler
= proc_dointvec
,
445 #ifdef CONFIG_BLK_DEV_INITRD
447 .procname
= "real-root-dev",
448 .data
= &real_root_dev
,
449 .maxlen
= sizeof(int),
451 .proc_handler
= proc_dointvec
,
455 .procname
= "print-fatal-signals",
456 .data
= &print_fatal_signals
,
457 .maxlen
= sizeof(int),
459 .proc_handler
= proc_dointvec
,
463 .procname
= "reboot-cmd",
464 .data
= reboot_command
,
467 .proc_handler
= proc_dostring
,
470 .procname
= "stop-a",
471 .data
= &stop_a_enabled
,
472 .maxlen
= sizeof (int),
474 .proc_handler
= proc_dointvec
,
477 .procname
= "scons-poweroff",
478 .data
= &scons_pwroff
,
479 .maxlen
= sizeof (int),
481 .proc_handler
= proc_dointvec
,
484 #ifdef CONFIG_SPARC64
486 .procname
= "tsb-ratio",
487 .data
= &sysctl_tsb_ratio
,
488 .maxlen
= sizeof (int),
490 .proc_handler
= proc_dointvec
,
495 .procname
= "soft-power",
496 .data
= &pwrsw_enabled
,
497 .maxlen
= sizeof (int),
499 .proc_handler
= proc_dointvec
,
502 .procname
= "unaligned-trap",
503 .data
= &unaligned_enabled
,
504 .maxlen
= sizeof (int),
506 .proc_handler
= proc_dointvec
,
510 .procname
= "ctrl-alt-del",
512 .maxlen
= sizeof(int),
514 .proc_handler
= proc_dointvec
,
516 #ifdef CONFIG_FUNCTION_TRACER
518 .procname
= "ftrace_enabled",
519 .data
= &ftrace_enabled
,
520 .maxlen
= sizeof(int),
522 .proc_handler
= ftrace_enable_sysctl
,
525 #ifdef CONFIG_STACK_TRACER
527 .procname
= "stack_tracer_enabled",
528 .data
= &stack_tracer_enabled
,
529 .maxlen
= sizeof(int),
531 .proc_handler
= stack_trace_sysctl
,
534 #ifdef CONFIG_TRACING
536 .procname
= "ftrace_dump_on_oops",
537 .data
= &ftrace_dump_on_oops
,
538 .maxlen
= sizeof(int),
540 .proc_handler
= proc_dointvec
,
543 #ifdef CONFIG_MODULES
545 .procname
= "modprobe",
546 .data
= &modprobe_path
,
547 .maxlen
= KMOD_PATH_LEN
,
549 .proc_handler
= proc_dostring
,
552 .procname
= "modules_disabled",
553 .data
= &modules_disabled
,
554 .maxlen
= sizeof(int),
556 /* only handle a transition from default "0" to "1" */
557 .proc_handler
= proc_dointvec_minmax
,
562 #ifdef CONFIG_HOTPLUG
564 .procname
= "hotplug",
565 .data
= &uevent_helper
,
566 .maxlen
= UEVENT_HELPER_PATH_LEN
,
568 .proc_handler
= proc_dostring
,
571 #ifdef CONFIG_CHR_DEV_SG
573 .procname
= "sg-big-buff",
574 .data
= &sg_big_buff
,
575 .maxlen
= sizeof (int),
577 .proc_handler
= proc_dointvec
,
580 #ifdef CONFIG_BSD_PROCESS_ACCT
584 .maxlen
= 3*sizeof(int),
586 .proc_handler
= proc_dointvec
,
589 #ifdef CONFIG_MAGIC_SYSRQ
592 .data
= &__sysrq_enabled
,
593 .maxlen
= sizeof (int),
595 .proc_handler
= sysrq_sysctl_handler
,
598 #ifdef CONFIG_PROC_SYSCTL
600 .procname
= "cad_pid",
602 .maxlen
= sizeof (int),
604 .proc_handler
= proc_do_cad_pid
,
608 .procname
= "threads-max",
609 .data
= &max_threads
,
610 .maxlen
= sizeof(int),
612 .proc_handler
= proc_dointvec
,
615 .procname
= "random",
617 .child
= random_table
,
620 .procname
= "usermodehelper",
622 .child
= usermodehelper_table
,
625 .procname
= "overflowuid",
626 .data
= &overflowuid
,
627 .maxlen
= sizeof(int),
629 .proc_handler
= proc_dointvec_minmax
,
630 .extra1
= &minolduid
,
631 .extra2
= &maxolduid
,
634 .procname
= "overflowgid",
635 .data
= &overflowgid
,
636 .maxlen
= sizeof(int),
638 .proc_handler
= proc_dointvec_minmax
,
639 .extra1
= &minolduid
,
640 .extra2
= &maxolduid
,
643 #ifdef CONFIG_MATHEMU
645 .procname
= "ieee_emulation_warnings",
646 .data
= &sysctl_ieee_emulation_warnings
,
647 .maxlen
= sizeof(int),
649 .proc_handler
= proc_dointvec
,
653 .procname
= "userprocess_debug",
654 .data
= &show_unhandled_signals
,
655 .maxlen
= sizeof(int),
657 .proc_handler
= proc_dointvec
,
661 .procname
= "pid_max",
663 .maxlen
= sizeof (int),
665 .proc_handler
= proc_dointvec_minmax
,
666 .extra1
= &pid_max_min
,
667 .extra2
= &pid_max_max
,
670 .procname
= "panic_on_oops",
671 .data
= &panic_on_oops
,
672 .maxlen
= sizeof(int),
674 .proc_handler
= proc_dointvec
,
676 #if defined CONFIG_PRINTK
678 .procname
= "printk",
679 .data
= &console_loglevel
,
680 .maxlen
= 4*sizeof(int),
682 .proc_handler
= proc_dointvec
,
685 .procname
= "printk_ratelimit",
686 .data
= &printk_ratelimit_state
.interval
,
687 .maxlen
= sizeof(int),
689 .proc_handler
= proc_dointvec_jiffies
,
692 .procname
= "printk_ratelimit_burst",
693 .data
= &printk_ratelimit_state
.burst
,
694 .maxlen
= sizeof(int),
696 .proc_handler
= proc_dointvec
,
699 .procname
= "printk_delay",
700 .data
= &printk_delay_msec
,
701 .maxlen
= sizeof(int),
703 .proc_handler
= proc_dointvec_minmax
,
705 .extra2
= &ten_thousand
,
708 .procname
= "dmesg_restrict",
709 .data
= &dmesg_restrict
,
710 .maxlen
= sizeof(int),
712 .proc_handler
= proc_dointvec_minmax_sysadmin
,
717 .procname
= "kptr_restrict",
718 .data
= &kptr_restrict
,
719 .maxlen
= sizeof(int),
721 .proc_handler
= proc_dointvec_minmax_sysadmin
,
727 .procname
= "ngroups_max",
728 .data
= &ngroups_max
,
729 .maxlen
= sizeof (int),
731 .proc_handler
= proc_dointvec
,
734 .procname
= "cap_last_cap",
735 .data
= (void *)&cap_last_cap
,
736 .maxlen
= sizeof(int),
738 .proc_handler
= proc_dointvec
,
740 #if defined(CONFIG_LOCKUP_DETECTOR)
742 .procname
= "watchdog",
743 .data
= &watchdog_enabled
,
744 .maxlen
= sizeof (int),
746 .proc_handler
= proc_dowatchdog
,
751 .procname
= "watchdog_thresh",
752 .data
= &watchdog_thresh
,
753 .maxlen
= sizeof(int),
755 .proc_handler
= proc_dowatchdog
,
760 .procname
= "softlockup_panic",
761 .data
= &softlockup_panic
,
762 .maxlen
= sizeof(int),
764 .proc_handler
= proc_dointvec_minmax
,
769 .procname
= "nmi_watchdog",
770 .data
= &watchdog_enabled
,
771 .maxlen
= sizeof (int),
773 .proc_handler
= proc_dowatchdog
,
778 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
780 .procname
= "unknown_nmi_panic",
781 .data
= &unknown_nmi_panic
,
782 .maxlen
= sizeof (int),
784 .proc_handler
= proc_dointvec
,
787 #if defined(CONFIG_X86)
789 .procname
= "panic_on_unrecovered_nmi",
790 .data
= &panic_on_unrecovered_nmi
,
791 .maxlen
= sizeof(int),
793 .proc_handler
= proc_dointvec
,
796 .procname
= "panic_on_io_nmi",
797 .data
= &panic_on_io_nmi
,
798 .maxlen
= sizeof(int),
800 .proc_handler
= proc_dointvec
,
802 #ifdef CONFIG_DEBUG_STACKOVERFLOW
804 .procname
= "panic_on_stackoverflow",
805 .data
= &sysctl_panic_on_stackoverflow
,
806 .maxlen
= sizeof(int),
808 .proc_handler
= proc_dointvec
,
812 .procname
= "bootloader_type",
813 .data
= &bootloader_type
,
814 .maxlen
= sizeof (int),
816 .proc_handler
= proc_dointvec
,
819 .procname
= "bootloader_version",
820 .data
= &bootloader_version
,
821 .maxlen
= sizeof (int),
823 .proc_handler
= proc_dointvec
,
826 .procname
= "kstack_depth_to_print",
827 .data
= &kstack_depth_to_print
,
828 .maxlen
= sizeof(int),
830 .proc_handler
= proc_dointvec
,
833 .procname
= "io_delay_type",
834 .data
= &io_delay_type
,
835 .maxlen
= sizeof(int),
837 .proc_handler
= proc_dointvec
,
840 #if defined(CONFIG_MMU)
842 .procname
= "randomize_va_space",
843 .data
= &randomize_va_space
,
844 .maxlen
= sizeof(int),
846 .proc_handler
= proc_dointvec
,
849 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
851 .procname
= "spin_retry",
853 .maxlen
= sizeof (int),
855 .proc_handler
= proc_dointvec
,
858 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
860 .procname
= "acpi_video_flags",
861 .data
= &acpi_realmode_flags
,
862 .maxlen
= sizeof (unsigned long),
864 .proc_handler
= proc_doulongvec_minmax
,
869 .procname
= "ignore-unaligned-usertrap",
870 .data
= &no_unaligned_warning
,
871 .maxlen
= sizeof (int),
873 .proc_handler
= proc_dointvec
,
876 .procname
= "unaligned-dump-stack",
877 .data
= &unaligned_dump_stack
,
878 .maxlen
= sizeof (int),
880 .proc_handler
= proc_dointvec
,
883 #ifdef CONFIG_DETECT_HUNG_TASK
885 .procname
= "hung_task_panic",
886 .data
= &sysctl_hung_task_panic
,
887 .maxlen
= sizeof(int),
889 .proc_handler
= proc_dointvec_minmax
,
894 .procname
= "hung_task_check_count",
895 .data
= &sysctl_hung_task_check_count
,
896 .maxlen
= sizeof(unsigned long),
898 .proc_handler
= proc_doulongvec_minmax
,
901 .procname
= "hung_task_timeout_secs",
902 .data
= &sysctl_hung_task_timeout_secs
,
903 .maxlen
= sizeof(unsigned long),
905 .proc_handler
= proc_dohung_task_timeout_secs
,
908 .procname
= "hung_task_warnings",
909 .data
= &sysctl_hung_task_warnings
,
910 .maxlen
= sizeof(unsigned long),
912 .proc_handler
= proc_doulongvec_minmax
,
917 .procname
= "compat-log",
919 .maxlen
= sizeof (int),
921 .proc_handler
= proc_dointvec
,
924 #ifdef CONFIG_RT_MUTEXES
926 .procname
= "max_lock_depth",
927 .data
= &max_lock_depth
,
928 .maxlen
= sizeof(int),
930 .proc_handler
= proc_dointvec
,
934 .procname
= "poweroff_cmd",
935 .data
= &poweroff_cmd
,
936 .maxlen
= POWEROFF_CMD_PATH_LEN
,
938 .proc_handler
= proc_dostring
,
944 .child
= key_sysctls
,
947 #ifdef CONFIG_RCU_TORTURE_TEST
949 .procname
= "rcutorture_runnable",
950 .data
= &rcutorture_runnable
,
951 .maxlen
= sizeof(int),
953 .proc_handler
= proc_dointvec
,
956 #ifdef CONFIG_PERF_EVENTS
958 * User-space scripts rely on the existence of this file
959 * as a feature check for perf_events being enabled.
961 * So it's an ABI, do not remove!
964 .procname
= "perf_event_paranoid",
965 .data
= &sysctl_perf_event_paranoid
,
966 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
968 .proc_handler
= proc_dointvec
,
971 .procname
= "perf_event_mlock_kb",
972 .data
= &sysctl_perf_event_mlock
,
973 .maxlen
= sizeof(sysctl_perf_event_mlock
),
975 .proc_handler
= proc_dointvec
,
978 .procname
= "perf_event_max_sample_rate",
979 .data
= &sysctl_perf_event_sample_rate
,
980 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
982 .proc_handler
= perf_proc_update_handler
,
985 #ifdef CONFIG_KMEMCHECK
987 .procname
= "kmemcheck",
988 .data
= &kmemcheck_enabled
,
989 .maxlen
= sizeof(int),
991 .proc_handler
= proc_dointvec
,
996 .procname
= "blk_iopoll",
997 .data
= &blk_iopoll_enabled
,
998 .maxlen
= sizeof(int),
1000 .proc_handler
= proc_dointvec
,
1006 static struct ctl_table vm_table
[] = {
1008 .procname
= "overcommit_memory",
1009 .data
= &sysctl_overcommit_memory
,
1010 .maxlen
= sizeof(sysctl_overcommit_memory
),
1012 .proc_handler
= proc_dointvec_minmax
,
1017 .procname
= "panic_on_oom",
1018 .data
= &sysctl_panic_on_oom
,
1019 .maxlen
= sizeof(sysctl_panic_on_oom
),
1021 .proc_handler
= proc_dointvec_minmax
,
1026 .procname
= "oom_kill_allocating_task",
1027 .data
= &sysctl_oom_kill_allocating_task
,
1028 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1030 .proc_handler
= proc_dointvec
,
1033 .procname
= "oom_dump_tasks",
1034 .data
= &sysctl_oom_dump_tasks
,
1035 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1037 .proc_handler
= proc_dointvec
,
1040 .procname
= "overcommit_ratio",
1041 .data
= &sysctl_overcommit_ratio
,
1042 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1044 .proc_handler
= proc_dointvec
,
1047 .procname
= "page-cluster",
1048 .data
= &page_cluster
,
1049 .maxlen
= sizeof(int),
1051 .proc_handler
= proc_dointvec_minmax
,
1055 .procname
= "dirty_background_ratio",
1056 .data
= &dirty_background_ratio
,
1057 .maxlen
= sizeof(dirty_background_ratio
),
1059 .proc_handler
= dirty_background_ratio_handler
,
1061 .extra2
= &one_hundred
,
1064 .procname
= "dirty_background_bytes",
1065 .data
= &dirty_background_bytes
,
1066 .maxlen
= sizeof(dirty_background_bytes
),
1068 .proc_handler
= dirty_background_bytes_handler
,
1072 .procname
= "dirty_ratio",
1073 .data
= &vm_dirty_ratio
,
1074 .maxlen
= sizeof(vm_dirty_ratio
),
1076 .proc_handler
= dirty_ratio_handler
,
1078 .extra2
= &one_hundred
,
1081 .procname
= "dirty_bytes",
1082 .data
= &vm_dirty_bytes
,
1083 .maxlen
= sizeof(vm_dirty_bytes
),
1085 .proc_handler
= dirty_bytes_handler
,
1086 .extra1
= &dirty_bytes_min
,
1089 .procname
= "dirty_writeback_centisecs",
1090 .data
= &dirty_writeback_interval
,
1091 .maxlen
= sizeof(dirty_writeback_interval
),
1093 .proc_handler
= dirty_writeback_centisecs_handler
,
1096 .procname
= "dirty_expire_centisecs",
1097 .data
= &dirty_expire_interval
,
1098 .maxlen
= sizeof(dirty_expire_interval
),
1100 .proc_handler
= proc_dointvec_minmax
,
1104 .procname
= "nr_pdflush_threads",
1105 .data
= &nr_pdflush_threads
,
1106 .maxlen
= sizeof nr_pdflush_threads
,
1107 .mode
= 0444 /* read-only*/,
1108 .proc_handler
= proc_dointvec
,
1111 .procname
= "swappiness",
1112 .data
= &vm_swappiness
,
1113 .maxlen
= sizeof(vm_swappiness
),
1115 .proc_handler
= proc_dointvec_minmax
,
1117 .extra2
= &one_hundred
,
1119 #ifdef CONFIG_HUGETLB_PAGE
1121 .procname
= "nr_hugepages",
1123 .maxlen
= sizeof(unsigned long),
1125 .proc_handler
= hugetlb_sysctl_handler
,
1126 .extra1
= (void *)&hugetlb_zero
,
1127 .extra2
= (void *)&hugetlb_infinity
,
1131 .procname
= "nr_hugepages_mempolicy",
1133 .maxlen
= sizeof(unsigned long),
1135 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1136 .extra1
= (void *)&hugetlb_zero
,
1137 .extra2
= (void *)&hugetlb_infinity
,
1141 .procname
= "hugetlb_shm_group",
1142 .data
= &sysctl_hugetlb_shm_group
,
1143 .maxlen
= sizeof(gid_t
),
1145 .proc_handler
= proc_dointvec
,
1148 .procname
= "hugepages_treat_as_movable",
1149 .data
= &hugepages_treat_as_movable
,
1150 .maxlen
= sizeof(int),
1152 .proc_handler
= hugetlb_treat_movable_handler
,
1155 .procname
= "nr_overcommit_hugepages",
1157 .maxlen
= sizeof(unsigned long),
1159 .proc_handler
= hugetlb_overcommit_handler
,
1160 .extra1
= (void *)&hugetlb_zero
,
1161 .extra2
= (void *)&hugetlb_infinity
,
1165 .procname
= "lowmem_reserve_ratio",
1166 .data
= &sysctl_lowmem_reserve_ratio
,
1167 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1169 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1172 .procname
= "drop_caches",
1173 .data
= &sysctl_drop_caches
,
1174 .maxlen
= sizeof(int),
1176 .proc_handler
= drop_caches_sysctl_handler
,
1180 #ifdef CONFIG_COMPACTION
1182 .procname
= "compact_memory",
1183 .data
= &sysctl_compact_memory
,
1184 .maxlen
= sizeof(int),
1186 .proc_handler
= sysctl_compaction_handler
,
1189 .procname
= "extfrag_threshold",
1190 .data
= &sysctl_extfrag_threshold
,
1191 .maxlen
= sizeof(int),
1193 .proc_handler
= sysctl_extfrag_handler
,
1194 .extra1
= &min_extfrag_threshold
,
1195 .extra2
= &max_extfrag_threshold
,
1198 #endif /* CONFIG_COMPACTION */
1200 .procname
= "min_free_kbytes",
1201 .data
= &min_free_kbytes
,
1202 .maxlen
= sizeof(min_free_kbytes
),
1204 .proc_handler
= min_free_kbytes_sysctl_handler
,
1208 .procname
= "percpu_pagelist_fraction",
1209 .data
= &percpu_pagelist_fraction
,
1210 .maxlen
= sizeof(percpu_pagelist_fraction
),
1212 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1213 .extra1
= &min_percpu_pagelist_fract
,
1217 .procname
= "max_map_count",
1218 .data
= &sysctl_max_map_count
,
1219 .maxlen
= sizeof(sysctl_max_map_count
),
1221 .proc_handler
= proc_dointvec_minmax
,
1226 .procname
= "nr_trim_pages",
1227 .data
= &sysctl_nr_trim_pages
,
1228 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1230 .proc_handler
= proc_dointvec_minmax
,
1235 .procname
= "laptop_mode",
1236 .data
= &laptop_mode
,
1237 .maxlen
= sizeof(laptop_mode
),
1239 .proc_handler
= proc_dointvec_jiffies
,
1242 .procname
= "block_dump",
1243 .data
= &block_dump
,
1244 .maxlen
= sizeof(block_dump
),
1246 .proc_handler
= proc_dointvec
,
1250 .procname
= "vfs_cache_pressure",
1251 .data
= &sysctl_vfs_cache_pressure
,
1252 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1254 .proc_handler
= proc_dointvec
,
1257 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1259 .procname
= "legacy_va_layout",
1260 .data
= &sysctl_legacy_va_layout
,
1261 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1263 .proc_handler
= proc_dointvec
,
1269 .procname
= "zone_reclaim_mode",
1270 .data
= &zone_reclaim_mode
,
1271 .maxlen
= sizeof(zone_reclaim_mode
),
1273 .proc_handler
= proc_dointvec
,
1277 .procname
= "min_unmapped_ratio",
1278 .data
= &sysctl_min_unmapped_ratio
,
1279 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1281 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1283 .extra2
= &one_hundred
,
1286 .procname
= "min_slab_ratio",
1287 .data
= &sysctl_min_slab_ratio
,
1288 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1290 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1292 .extra2
= &one_hundred
,
1297 .procname
= "stat_interval",
1298 .data
= &sysctl_stat_interval
,
1299 .maxlen
= sizeof(sysctl_stat_interval
),
1301 .proc_handler
= proc_dointvec_jiffies
,
1306 .procname
= "mmap_min_addr",
1307 .data
= &dac_mmap_min_addr
,
1308 .maxlen
= sizeof(unsigned long),
1310 .proc_handler
= mmap_min_addr_handler
,
1315 .procname
= "numa_zonelist_order",
1316 .data
= &numa_zonelist_order
,
1317 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1319 .proc_handler
= numa_zonelist_order_handler
,
1322 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1323 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1325 .procname
= "vdso_enabled",
1326 .data
= &vdso_enabled
,
1327 .maxlen
= sizeof(vdso_enabled
),
1329 .proc_handler
= proc_dointvec
,
1333 #ifdef CONFIG_HIGHMEM
1335 .procname
= "highmem_is_dirtyable",
1336 .data
= &vm_highmem_is_dirtyable
,
1337 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1339 .proc_handler
= proc_dointvec_minmax
,
1345 .procname
= "scan_unevictable_pages",
1346 .data
= &scan_unevictable_pages
,
1347 .maxlen
= sizeof(scan_unevictable_pages
),
1349 .proc_handler
= scan_unevictable_handler
,
1351 #ifdef CONFIG_MEMORY_FAILURE
1353 .procname
= "memory_failure_early_kill",
1354 .data
= &sysctl_memory_failure_early_kill
,
1355 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1357 .proc_handler
= proc_dointvec_minmax
,
1362 .procname
= "memory_failure_recovery",
1363 .data
= &sysctl_memory_failure_recovery
,
1364 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1366 .proc_handler
= proc_dointvec_minmax
,
1374 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1375 static struct ctl_table binfmt_misc_table
[] = {
1380 static struct ctl_table fs_table
[] = {
1382 .procname
= "inode-nr",
1383 .data
= &inodes_stat
,
1384 .maxlen
= 2*sizeof(int),
1386 .proc_handler
= proc_nr_inodes
,
1389 .procname
= "inode-state",
1390 .data
= &inodes_stat
,
1391 .maxlen
= 7*sizeof(int),
1393 .proc_handler
= proc_nr_inodes
,
1396 .procname
= "file-nr",
1397 .data
= &files_stat
,
1398 .maxlen
= sizeof(files_stat
),
1400 .proc_handler
= proc_nr_files
,
1403 .procname
= "file-max",
1404 .data
= &files_stat
.max_files
,
1405 .maxlen
= sizeof(files_stat
.max_files
),
1407 .proc_handler
= proc_doulongvec_minmax
,
1410 .procname
= "nr_open",
1411 .data
= &sysctl_nr_open
,
1412 .maxlen
= sizeof(int),
1414 .proc_handler
= proc_dointvec_minmax
,
1415 .extra1
= &sysctl_nr_open_min
,
1416 .extra2
= &sysctl_nr_open_max
,
1419 .procname
= "dentry-state",
1420 .data
= &dentry_stat
,
1421 .maxlen
= 6*sizeof(int),
1423 .proc_handler
= proc_nr_dentry
,
1426 .procname
= "overflowuid",
1427 .data
= &fs_overflowuid
,
1428 .maxlen
= sizeof(int),
1430 .proc_handler
= proc_dointvec_minmax
,
1431 .extra1
= &minolduid
,
1432 .extra2
= &maxolduid
,
1435 .procname
= "overflowgid",
1436 .data
= &fs_overflowgid
,
1437 .maxlen
= sizeof(int),
1439 .proc_handler
= proc_dointvec_minmax
,
1440 .extra1
= &minolduid
,
1441 .extra2
= &maxolduid
,
1443 #ifdef CONFIG_FILE_LOCKING
1445 .procname
= "leases-enable",
1446 .data
= &leases_enable
,
1447 .maxlen
= sizeof(int),
1449 .proc_handler
= proc_dointvec
,
1452 #ifdef CONFIG_DNOTIFY
1454 .procname
= "dir-notify-enable",
1455 .data
= &dir_notify_enable
,
1456 .maxlen
= sizeof(int),
1458 .proc_handler
= proc_dointvec
,
1462 #ifdef CONFIG_FILE_LOCKING
1464 .procname
= "lease-break-time",
1465 .data
= &lease_break_time
,
1466 .maxlen
= sizeof(int),
1468 .proc_handler
= proc_dointvec
,
1473 .procname
= "aio-nr",
1475 .maxlen
= sizeof(aio_nr
),
1477 .proc_handler
= proc_doulongvec_minmax
,
1480 .procname
= "aio-max-nr",
1481 .data
= &aio_max_nr
,
1482 .maxlen
= sizeof(aio_max_nr
),
1484 .proc_handler
= proc_doulongvec_minmax
,
1486 #endif /* CONFIG_AIO */
1487 #ifdef CONFIG_INOTIFY_USER
1489 .procname
= "inotify",
1491 .child
= inotify_table
,
1496 .procname
= "epoll",
1498 .child
= epoll_table
,
1503 .procname
= "suid_dumpable",
1504 .data
= &suid_dumpable
,
1505 .maxlen
= sizeof(int),
1507 .proc_handler
= proc_dointvec_minmax_coredump
,
1511 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1513 .procname
= "binfmt_misc",
1515 .child
= binfmt_misc_table
,
1519 .procname
= "pipe-max-size",
1520 .data
= &pipe_max_size
,
1521 .maxlen
= sizeof(int),
1523 .proc_handler
= &pipe_proc_fn
,
1524 .extra1
= &pipe_min_size
,
1529 static struct ctl_table debug_table
[] = {
1530 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1531 defined(CONFIG_S390) || defined(CONFIG_TILE)
1533 .procname
= "exception-trace",
1534 .data
= &show_unhandled_signals
,
1535 .maxlen
= sizeof(int),
1537 .proc_handler
= proc_dointvec
1540 #if defined(CONFIG_OPTPROBES)
1542 .procname
= "kprobes-optimization",
1543 .data
= &sysctl_kprobes_optimization
,
1544 .maxlen
= sizeof(int),
1546 .proc_handler
= proc_kprobes_optimization_handler
,
1554 static struct ctl_table dev_table
[] = {
1558 int __init
sysctl_init(void)
1560 struct ctl_table_header
*hdr
;
1562 hdr
= register_sysctl_table(sysctl_base_table
);
1563 kmemleak_not_leak(hdr
);
1567 #endif /* CONFIG_SYSCTL */
1573 #ifdef CONFIG_PROC_SYSCTL
1575 static int _proc_do_string(void* data
, int maxlen
, int write
,
1576 void __user
*buffer
,
1577 size_t *lenp
, loff_t
*ppos
)
1583 if (!data
|| !maxlen
|| !*lenp
) {
1591 while (len
< *lenp
) {
1592 if (get_user(c
, p
++))
1594 if (c
== 0 || c
== '\n')
1600 if(copy_from_user(data
, buffer
, len
))
1602 ((char *) data
)[len
] = 0;
1620 if(copy_to_user(buffer
, data
, len
))
1623 if(put_user('\n', ((char __user
*) buffer
) + len
))
1634 * proc_dostring - read a string sysctl
1635 * @table: the sysctl table
1636 * @write: %TRUE if this is a write to the sysctl file
1637 * @buffer: the user buffer
1638 * @lenp: the size of the user buffer
1639 * @ppos: file position
1641 * Reads/writes a string from/to the user buffer. If the kernel
1642 * buffer provided is not large enough to hold the string, the
1643 * string is truncated. The copied string is %NULL-terminated.
1644 * If the string is being read by the user process, it is copied
1645 * and a newline '\n' is added. It is truncated if the buffer is
1648 * Returns 0 on success.
1650 int proc_dostring(struct ctl_table
*table
, int write
,
1651 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1653 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1654 buffer
, lenp
, ppos
);
1657 static size_t proc_skip_spaces(char **buf
)
1660 char *tmp
= skip_spaces(*buf
);
1666 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1676 #define TMPBUFLEN 22
1678 * proc_get_long - reads an ASCII formatted integer from a user buffer
1680 * @buf: a kernel buffer
1681 * @size: size of the kernel buffer
1682 * @val: this is where the number will be stored
1683 * @neg: set to %TRUE if number is negative
1684 * @perm_tr: a vector which contains the allowed trailers
1685 * @perm_tr_len: size of the perm_tr vector
1686 * @tr: pointer to store the trailer character
1688 * In case of success %0 is returned and @buf and @size are updated with
1689 * the amount of bytes read. If @tr is non-NULL and a trailing
1690 * character exists (size is non-zero after returning from this
1691 * function), @tr is updated with the trailing character.
1693 static int proc_get_long(char **buf
, size_t *size
,
1694 unsigned long *val
, bool *neg
,
1695 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1698 char *p
, tmp
[TMPBUFLEN
];
1704 if (len
> TMPBUFLEN
- 1)
1705 len
= TMPBUFLEN
- 1;
1707 memcpy(tmp
, *buf
, len
);
1711 if (*p
== '-' && *size
> 1) {
1719 *val
= simple_strtoul(p
, &p
, 0);
1723 /* We don't know if the next char is whitespace thus we may accept
1724 * invalid integers (e.g. 1234...a) or two integers instead of one
1725 * (e.g. 123...1). So lets not allow such large numbers. */
1726 if (len
== TMPBUFLEN
- 1)
1729 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1732 if (tr
&& (len
< *size
))
1742 * proc_put_long - converts an integer to a decimal ASCII formatted string
1744 * @buf: the user buffer
1745 * @size: the size of the user buffer
1746 * @val: the integer to be converted
1747 * @neg: sign of the number, %TRUE for negative
1749 * In case of success %0 is returned and @buf and @size are updated with
1750 * the amount of bytes written.
1752 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1756 char tmp
[TMPBUFLEN
], *p
= tmp
;
1758 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1762 if (copy_to_user(*buf
, tmp
, len
))
1770 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1773 char __user
**buffer
= (char __user
**)buf
;
1774 if (put_user(c
, *buffer
))
1776 (*size
)--, (*buffer
)++;
1782 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1784 int write
, void *data
)
1787 *valp
= *negp
? -*lvalp
: *lvalp
;
1792 *lvalp
= (unsigned long)-val
;
1795 *lvalp
= (unsigned long)val
;
1801 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1803 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1804 int write
, void __user
*buffer
,
1805 size_t *lenp
, loff_t
*ppos
,
1806 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1807 int write
, void *data
),
1810 int *i
, vleft
, first
= 1, err
= 0;
1811 unsigned long page
= 0;
1815 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1820 i
= (int *) tbl_data
;
1821 vleft
= table
->maxlen
/ sizeof(*i
);
1825 conv
= do_proc_dointvec_conv
;
1828 if (left
> PAGE_SIZE
- 1)
1829 left
= PAGE_SIZE
- 1;
1830 page
= __get_free_page(GFP_TEMPORARY
);
1831 kbuf
= (char *) page
;
1834 if (copy_from_user(kbuf
, buffer
, left
)) {
1841 for (; left
&& vleft
--; i
++, first
=0) {
1846 left
-= proc_skip_spaces(&kbuf
);
1850 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1852 sizeof(proc_wspace_sep
), NULL
);
1855 if (conv(&neg
, &lval
, i
, 1, data
)) {
1860 if (conv(&neg
, &lval
, i
, 0, data
)) {
1865 err
= proc_put_char(&buffer
, &left
, '\t');
1868 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1874 if (!write
&& !first
&& left
&& !err
)
1875 err
= proc_put_char(&buffer
, &left
, '\n');
1876 if (write
&& !err
&& left
)
1877 left
-= proc_skip_spaces(&kbuf
);
1882 return err
? : -EINVAL
;
1889 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
1890 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1891 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1892 int write
, void *data
),
1895 return __do_proc_dointvec(table
->data
, table
, write
,
1896 buffer
, lenp
, ppos
, conv
, data
);
1900 * proc_dointvec - read a vector of integers
1901 * @table: the sysctl table
1902 * @write: %TRUE if this is a write to the sysctl file
1903 * @buffer: the user buffer
1904 * @lenp: the size of the user buffer
1905 * @ppos: file position
1907 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1908 * values from/to the user buffer, treated as an ASCII string.
1910 * Returns 0 on success.
1912 int proc_dointvec(struct ctl_table
*table
, int write
,
1913 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1915 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
1920 * Taint values can only be increased
1921 * This means we can safely use a temporary.
1923 static int proc_taint(struct ctl_table
*table
, int write
,
1924 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1927 unsigned long tmptaint
= get_taint();
1930 if (write
&& !capable(CAP_SYS_ADMIN
))
1935 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
1941 * Poor man's atomic or. Not worth adding a primitive
1942 * to everyone's atomic.h for this
1945 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
1946 if ((tmptaint
>> i
) & 1)
1954 #ifdef CONFIG_PRINTK
1955 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
1956 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1958 if (write
&& !capable(CAP_SYS_ADMIN
))
1961 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
1965 struct do_proc_dointvec_minmax_conv_param
{
1970 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
1972 int write
, void *data
)
1974 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1976 int val
= *negp
? -*lvalp
: *lvalp
;
1977 if ((param
->min
&& *param
->min
> val
) ||
1978 (param
->max
&& *param
->max
< val
))
1985 *lvalp
= (unsigned long)-val
;
1988 *lvalp
= (unsigned long)val
;
1995 * proc_dointvec_minmax - read a vector of integers with min/max values
1996 * @table: the sysctl table
1997 * @write: %TRUE if this is a write to the sysctl file
1998 * @buffer: the user buffer
1999 * @lenp: the size of the user buffer
2000 * @ppos: file position
2002 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2003 * values from/to the user buffer, treated as an ASCII string.
2005 * This routine will ensure the values are within the range specified by
2006 * table->extra1 (min) and table->extra2 (max).
2008 * Returns 0 on success.
2010 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2011 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2013 struct do_proc_dointvec_minmax_conv_param param
= {
2014 .min
= (int *) table
->extra1
,
2015 .max
= (int *) table
->extra2
,
2017 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2018 do_proc_dointvec_minmax_conv
, ¶m
);
2021 static void validate_coredump_safety(void)
2023 if (suid_dumpable
== SUID_DUMPABLE_SAFE
&&
2024 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2025 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2026 "suid_dumpable=2. Pipe handler or fully qualified "\
2027 "core dump path required.\n");
2031 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2032 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2034 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2036 validate_coredump_safety();
2040 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2041 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2043 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2045 validate_coredump_safety();
2049 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2050 void __user
*buffer
,
2051 size_t *lenp
, loff_t
*ppos
,
2052 unsigned long convmul
,
2053 unsigned long convdiv
)
2055 unsigned long *i
, *min
, *max
;
2056 int vleft
, first
= 1, err
= 0;
2057 unsigned long page
= 0;
2061 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2066 i
= (unsigned long *) data
;
2067 min
= (unsigned long *) table
->extra1
;
2068 max
= (unsigned long *) table
->extra2
;
2069 vleft
= table
->maxlen
/ sizeof(unsigned long);
2073 if (left
> PAGE_SIZE
- 1)
2074 left
= PAGE_SIZE
- 1;
2075 page
= __get_free_page(GFP_TEMPORARY
);
2076 kbuf
= (char *) page
;
2079 if (copy_from_user(kbuf
, buffer
, left
)) {
2086 for (; left
&& vleft
--; i
++, first
= 0) {
2092 left
-= proc_skip_spaces(&kbuf
);
2094 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2096 sizeof(proc_wspace_sep
), NULL
);
2101 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2105 val
= convdiv
* (*i
) / convmul
;
2107 err
= proc_put_char(&buffer
, &left
, '\t');
2108 err
= proc_put_long(&buffer
, &left
, val
, false);
2114 if (!write
&& !first
&& left
&& !err
)
2115 err
= proc_put_char(&buffer
, &left
, '\n');
2117 left
-= proc_skip_spaces(&kbuf
);
2122 return err
? : -EINVAL
;
2129 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2130 void __user
*buffer
,
2131 size_t *lenp
, loff_t
*ppos
,
2132 unsigned long convmul
,
2133 unsigned long convdiv
)
2135 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2136 buffer
, lenp
, ppos
, convmul
, convdiv
);
2140 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2141 * @table: the sysctl table
2142 * @write: %TRUE if this is a write to the sysctl file
2143 * @buffer: the user buffer
2144 * @lenp: the size of the user buffer
2145 * @ppos: file position
2147 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2148 * values from/to the user buffer, treated as an ASCII string.
2150 * This routine will ensure the values are within the range specified by
2151 * table->extra1 (min) and table->extra2 (max).
2153 * Returns 0 on success.
2155 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2156 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2158 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2162 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2163 * @table: the sysctl table
2164 * @write: %TRUE if this is a write to the sysctl file
2165 * @buffer: the user buffer
2166 * @lenp: the size of the user buffer
2167 * @ppos: file position
2169 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2170 * values from/to the user buffer, treated as an ASCII string. The values
2171 * are treated as milliseconds, and converted to jiffies when they are stored.
2173 * This routine will ensure the values are within the range specified by
2174 * table->extra1 (min) and table->extra2 (max).
2176 * Returns 0 on success.
2178 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2179 void __user
*buffer
,
2180 size_t *lenp
, loff_t
*ppos
)
2182 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2183 lenp
, ppos
, HZ
, 1000l);
2187 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2189 int write
, void *data
)
2192 if (*lvalp
> LONG_MAX
/ HZ
)
2194 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2200 lval
= (unsigned long)-val
;
2203 lval
= (unsigned long)val
;
2210 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2212 int write
, void *data
)
2215 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2217 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2223 lval
= (unsigned long)-val
;
2226 lval
= (unsigned long)val
;
2228 *lvalp
= jiffies_to_clock_t(lval
);
2233 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2235 int write
, void *data
)
2238 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2244 lval
= (unsigned long)-val
;
2247 lval
= (unsigned long)val
;
2249 *lvalp
= jiffies_to_msecs(lval
);
2255 * proc_dointvec_jiffies - read a vector of integers as seconds
2256 * @table: the sysctl table
2257 * @write: %TRUE if this is a write to the sysctl file
2258 * @buffer: the user buffer
2259 * @lenp: the size of the user buffer
2260 * @ppos: file position
2262 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2263 * values from/to the user buffer, treated as an ASCII string.
2264 * The values read are assumed to be in seconds, and are converted into
2267 * Returns 0 on success.
2269 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2270 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2272 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2273 do_proc_dointvec_jiffies_conv
,NULL
);
2277 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2278 * @table: the sysctl table
2279 * @write: %TRUE if this is a write to the sysctl file
2280 * @buffer: the user buffer
2281 * @lenp: the size of the user buffer
2282 * @ppos: pointer to the file position
2284 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2285 * values from/to the user buffer, treated as an ASCII string.
2286 * The values read are assumed to be in 1/USER_HZ seconds, and
2287 * are converted into jiffies.
2289 * Returns 0 on success.
2291 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2292 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2294 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2295 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2299 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2300 * @table: the sysctl table
2301 * @write: %TRUE if this is a write to the sysctl file
2302 * @buffer: the user buffer
2303 * @lenp: the size of the user buffer
2304 * @ppos: file position
2305 * @ppos: the current position in the file
2307 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2308 * values from/to the user buffer, treated as an ASCII string.
2309 * The values read are assumed to be in 1/1000 seconds, and
2310 * are converted into jiffies.
2312 * Returns 0 on success.
2314 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2315 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2317 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2318 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2321 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2322 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2324 struct pid
*new_pid
;
2328 tmp
= pid_vnr(cad_pid
);
2330 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2331 lenp
, ppos
, NULL
, NULL
);
2335 new_pid
= find_get_pid(tmp
);
2339 put_pid(xchg(&cad_pid
, new_pid
));
2344 * proc_do_large_bitmap - read/write from/to a large bitmap
2345 * @table: the sysctl table
2346 * @write: %TRUE if this is a write to the sysctl file
2347 * @buffer: the user buffer
2348 * @lenp: the size of the user buffer
2349 * @ppos: file position
2351 * The bitmap is stored at table->data and the bitmap length (in bits)
2354 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2355 * large bitmaps may be represented in a compact manner. Writing into
2356 * the file will clear the bitmap then update it with the given input.
2358 * Returns 0 on success.
2360 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2361 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2365 size_t left
= *lenp
;
2366 unsigned long bitmap_len
= table
->maxlen
;
2367 unsigned long *bitmap
= (unsigned long *) table
->data
;
2368 unsigned long *tmp_bitmap
= NULL
;
2369 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2371 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2377 unsigned long page
= 0;
2380 if (left
> PAGE_SIZE
- 1)
2381 left
= PAGE_SIZE
- 1;
2383 page
= __get_free_page(GFP_TEMPORARY
);
2384 kbuf
= (char *) page
;
2387 if (copy_from_user(kbuf
, buffer
, left
)) {
2393 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2399 proc_skip_char(&kbuf
, &left
, '\n');
2400 while (!err
&& left
) {
2401 unsigned long val_a
, val_b
;
2404 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2408 if (val_a
>= bitmap_len
|| neg
) {
2420 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2421 &neg
, tr_b
, sizeof(tr_b
),
2425 if (val_b
>= bitmap_len
|| neg
||
2436 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2438 proc_skip_char(&kbuf
, &left
, '\n');
2442 unsigned long bit_a
, bit_b
= 0;
2445 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2446 if (bit_a
>= bitmap_len
)
2448 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2452 err
= proc_put_char(&buffer
, &left
, ',');
2456 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2459 if (bit_a
!= bit_b
) {
2460 err
= proc_put_char(&buffer
, &left
, '-');
2463 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2471 err
= proc_put_char(&buffer
, &left
, '\n');
2477 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2479 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2491 #else /* CONFIG_PROC_SYSCTL */
2493 int proc_dostring(struct ctl_table
*table
, int write
,
2494 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2499 int proc_dointvec(struct ctl_table
*table
, int write
,
2500 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2505 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2506 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2511 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2512 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2517 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2518 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2523 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2524 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2529 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2530 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2535 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2536 void __user
*buffer
,
2537 size_t *lenp
, loff_t
*ppos
)
2543 #endif /* CONFIG_PROC_SYSCTL */
2546 * No sense putting this after each symbol definition, twice,
2547 * exception granted :-)
2549 EXPORT_SYMBOL(proc_dointvec
);
2550 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2551 EXPORT_SYMBOL(proc_dointvec_minmax
);
2552 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2553 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2554 EXPORT_SYMBOL(proc_dostring
);
2555 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2556 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);