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/signal.h>
27 #include <linux/printk.h>
28 #include <linux/proc_fs.h>
29 #include <linux/security.h>
30 #include <linux/ctype.h>
31 #include <linux/kmemcheck.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/ratelimit.h>
41 #include <linux/compaction.h>
42 #include <linux/hugetlb.h>
43 #include <linux/initrd.h>
44 #include <linux/key.h>
45 #include <linux/times.h>
46 #include <linux/limits.h>
47 #include <linux/dcache.h>
48 #include <linux/dnotify.h>
49 #include <linux/syscalls.h>
50 #include <linux/vmstat.h>
51 #include <linux/nfs_fs.h>
52 #include <linux/acpi.h>
53 #include <linux/reboot.h>
54 #include <linux/ftrace.h>
55 #include <linux/perf_event.h>
56 #include <linux/kprobes.h>
57 #include <linux/pipe_fs_i.h>
58 #include <linux/oom.h>
59 #include <linux/kmod.h>
60 #include <linux/capability.h>
61 #include <linux/binfmts.h>
63 #include <asm/uaccess.h>
64 #include <asm/processor.h>
68 #include <asm/stacktrace.h>
71 #ifdef CONFIG_BSD_PROCESS_ACCT
72 #include <linux/acct.h>
74 #ifdef CONFIG_RT_MUTEXES
75 #include <linux/rtmutex.h>
77 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
78 #include <linux/lockdep.h>
80 #ifdef CONFIG_CHR_DEV_SG
84 #ifdef CONFIG_LOCKUP_DETECTOR
85 #include <linux/nmi.h>
89 #if defined(CONFIG_SYSCTL)
91 /* External variables not in a header file. */
92 extern int sysctl_overcommit_memory
;
93 extern int sysctl_overcommit_ratio
;
94 extern int max_threads
;
95 extern int core_uses_pid
;
96 extern int suid_dumpable
;
97 extern char core_pattern
[];
98 extern unsigned int core_pipe_limit
;
100 extern int min_free_kbytes
;
101 extern int pid_max_min
, pid_max_max
;
102 extern int sysctl_drop_caches
;
103 extern int percpu_pagelist_fraction
;
104 extern int compat_log
;
105 extern int latencytop_enabled
;
106 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
108 extern int sysctl_nr_trim_pages
;
111 extern int blk_iopoll_enabled
;
114 /* Constants used for minimum and maximum */
115 #ifdef CONFIG_LOCKUP_DETECTOR
116 static int sixty
= 60;
117 static int neg_one
= -1;
121 static int __maybe_unused one
= 1;
122 static int __maybe_unused two
= 2;
123 static int __maybe_unused three
= 3;
124 static unsigned long one_ul
= 1;
125 static int one_hundred
= 100;
127 static int ten_thousand
= 10000;
130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
131 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
134 static int maxolduid
= 65535;
135 static int minolduid
;
136 static int min_percpu_pagelist_fract
= 8;
138 static int ngroups_max
= NGROUPS_MAX
;
139 static const int cap_last_cap
= CAP_LAST_CAP
;
141 #ifdef CONFIG_INOTIFY_USER
142 #include <linux/inotify.h>
145 #include <asm/system.h>
148 #ifdef CONFIG_SPARC64
149 extern int sysctl_tsb_ratio
;
153 extern int pwrsw_enabled
;
154 extern int unaligned_enabled
;
158 extern int no_unaligned_warning
;
159 extern int unaligned_dump_stack
;
162 #ifdef CONFIG_PROC_SYSCTL
163 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
164 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
165 static int proc_taint(struct ctl_table
*table
, int write
,
166 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
170 static int proc_dmesg_restrict(struct ctl_table
*table
, int write
,
171 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
174 #ifdef CONFIG_MAGIC_SYSRQ
175 /* Note: sysrq code uses it's own private copy */
176 static int __sysrq_enabled
= SYSRQ_DEFAULT_ENABLE
;
178 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
179 void __user
*buffer
, size_t *lenp
,
184 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
189 sysrq_toggle_support(__sysrq_enabled
);
196 static struct ctl_table kern_table
[];
197 static struct ctl_table vm_table
[];
198 static struct ctl_table fs_table
[];
199 static struct ctl_table debug_table
[];
200 static struct ctl_table dev_table
[];
201 extern struct ctl_table random_table
[];
203 extern struct ctl_table epoll_table
[];
206 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
207 int sysctl_legacy_va_layout
;
210 /* The default sysctl tables: */
212 static struct ctl_table sysctl_base_table
[] = {
214 .procname
= "kernel",
231 .child
= debug_table
,
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 */
246 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
247 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
250 #ifdef CONFIG_COMPACTION
251 static int min_extfrag_threshold
;
252 static int max_extfrag_threshold
= 1000;
255 static struct ctl_table kern_table
[] = {
257 .procname
= "sched_child_runs_first",
258 .data
= &sysctl_sched_child_runs_first
,
259 .maxlen
= sizeof(unsigned int),
261 .proc_handler
= proc_dointvec
,
263 #ifdef CONFIG_SCHED_DEBUG
265 .procname
= "sched_min_granularity_ns",
266 .data
= &sysctl_sched_min_granularity
,
267 .maxlen
= sizeof(unsigned int),
269 .proc_handler
= sched_proc_update_handler
,
270 .extra1
= &min_sched_granularity_ns
,
271 .extra2
= &max_sched_granularity_ns
,
274 .procname
= "sched_latency_ns",
275 .data
= &sysctl_sched_latency
,
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_wakeup_granularity_ns",
284 .data
= &sysctl_sched_wakeup_granularity
,
285 .maxlen
= sizeof(unsigned int),
287 .proc_handler
= sched_proc_update_handler
,
288 .extra1
= &min_wakeup_granularity_ns
,
289 .extra2
= &max_wakeup_granularity_ns
,
292 .procname
= "sched_tunable_scaling",
293 .data
= &sysctl_sched_tunable_scaling
,
294 .maxlen
= sizeof(enum sched_tunable_scaling
),
296 .proc_handler
= sched_proc_update_handler
,
297 .extra1
= &min_sched_tunable_scaling
,
298 .extra2
= &max_sched_tunable_scaling
,
301 .procname
= "sched_migration_cost",
302 .data
= &sysctl_sched_migration_cost
,
303 .maxlen
= sizeof(unsigned int),
305 .proc_handler
= proc_dointvec
,
308 .procname
= "sched_nr_migrate",
309 .data
= &sysctl_sched_nr_migrate
,
310 .maxlen
= sizeof(unsigned int),
312 .proc_handler
= proc_dointvec
,
315 .procname
= "sched_time_avg",
316 .data
= &sysctl_sched_time_avg
,
317 .maxlen
= sizeof(unsigned int),
319 .proc_handler
= proc_dointvec
,
322 .procname
= "sched_shares_window",
323 .data
= &sysctl_sched_shares_window
,
324 .maxlen
= sizeof(unsigned int),
326 .proc_handler
= proc_dointvec
,
329 .procname
= "timer_migration",
330 .data
= &sysctl_timer_migration
,
331 .maxlen
= sizeof(unsigned int),
333 .proc_handler
= proc_dointvec_minmax
,
339 .procname
= "sched_rt_period_us",
340 .data
= &sysctl_sched_rt_period
,
341 .maxlen
= sizeof(unsigned int),
343 .proc_handler
= sched_rt_handler
,
346 .procname
= "sched_rt_runtime_us",
347 .data
= &sysctl_sched_rt_runtime
,
348 .maxlen
= sizeof(int),
350 .proc_handler
= sched_rt_handler
,
352 #ifdef CONFIG_SCHED_AUTOGROUP
354 .procname
= "sched_autogroup_enabled",
355 .data
= &sysctl_sched_autogroup_enabled
,
356 .maxlen
= sizeof(unsigned int),
358 .proc_handler
= proc_dointvec_minmax
,
363 #ifdef CONFIG_CFS_BANDWIDTH
365 .procname
= "sched_cfs_bandwidth_slice_us",
366 .data
= &sysctl_sched_cfs_bandwidth_slice
,
367 .maxlen
= sizeof(unsigned int),
369 .proc_handler
= proc_dointvec_minmax
,
373 #ifdef CONFIG_PROVE_LOCKING
375 .procname
= "prove_locking",
376 .data
= &prove_locking
,
377 .maxlen
= sizeof(int),
379 .proc_handler
= proc_dointvec
,
382 #ifdef CONFIG_LOCK_STAT
384 .procname
= "lock_stat",
386 .maxlen
= sizeof(int),
388 .proc_handler
= proc_dointvec
,
393 .data
= &panic_timeout
,
394 .maxlen
= sizeof(int),
396 .proc_handler
= proc_dointvec
,
399 .procname
= "core_uses_pid",
400 .data
= &core_uses_pid
,
401 .maxlen
= sizeof(int),
403 .proc_handler
= proc_dointvec
,
406 .procname
= "core_pattern",
407 .data
= core_pattern
,
408 .maxlen
= CORENAME_MAX_SIZE
,
410 .proc_handler
= proc_dostring
,
413 .procname
= "core_pipe_limit",
414 .data
= &core_pipe_limit
,
415 .maxlen
= sizeof(unsigned int),
417 .proc_handler
= proc_dointvec
,
419 #ifdef CONFIG_PROC_SYSCTL
421 .procname
= "tainted",
422 .maxlen
= sizeof(long),
424 .proc_handler
= proc_taint
,
427 #ifdef CONFIG_LATENCYTOP
429 .procname
= "latencytop",
430 .data
= &latencytop_enabled
,
431 .maxlen
= sizeof(int),
433 .proc_handler
= proc_dointvec
,
436 #ifdef CONFIG_BLK_DEV_INITRD
438 .procname
= "real-root-dev",
439 .data
= &real_root_dev
,
440 .maxlen
= sizeof(int),
442 .proc_handler
= proc_dointvec
,
446 .procname
= "print-fatal-signals",
447 .data
= &print_fatal_signals
,
448 .maxlen
= sizeof(int),
450 .proc_handler
= proc_dointvec
,
454 .procname
= "reboot-cmd",
455 .data
= reboot_command
,
458 .proc_handler
= proc_dostring
,
461 .procname
= "stop-a",
462 .data
= &stop_a_enabled
,
463 .maxlen
= sizeof (int),
465 .proc_handler
= proc_dointvec
,
468 .procname
= "scons-poweroff",
469 .data
= &scons_pwroff
,
470 .maxlen
= sizeof (int),
472 .proc_handler
= proc_dointvec
,
475 #ifdef CONFIG_SPARC64
477 .procname
= "tsb-ratio",
478 .data
= &sysctl_tsb_ratio
,
479 .maxlen
= sizeof (int),
481 .proc_handler
= proc_dointvec
,
486 .procname
= "soft-power",
487 .data
= &pwrsw_enabled
,
488 .maxlen
= sizeof (int),
490 .proc_handler
= proc_dointvec
,
493 .procname
= "unaligned-trap",
494 .data
= &unaligned_enabled
,
495 .maxlen
= sizeof (int),
497 .proc_handler
= proc_dointvec
,
501 .procname
= "ctrl-alt-del",
503 .maxlen
= sizeof(int),
505 .proc_handler
= proc_dointvec
,
507 #ifdef CONFIG_FUNCTION_TRACER
509 .procname
= "ftrace_enabled",
510 .data
= &ftrace_enabled
,
511 .maxlen
= sizeof(int),
513 .proc_handler
= ftrace_enable_sysctl
,
516 #ifdef CONFIG_STACK_TRACER
518 .procname
= "stack_tracer_enabled",
519 .data
= &stack_tracer_enabled
,
520 .maxlen
= sizeof(int),
522 .proc_handler
= stack_trace_sysctl
,
525 #ifdef CONFIG_TRACING
527 .procname
= "ftrace_dump_on_oops",
528 .data
= &ftrace_dump_on_oops
,
529 .maxlen
= sizeof(int),
531 .proc_handler
= proc_dointvec
,
534 #ifdef CONFIG_MODULES
536 .procname
= "modprobe",
537 .data
= &modprobe_path
,
538 .maxlen
= KMOD_PATH_LEN
,
540 .proc_handler
= proc_dostring
,
543 .procname
= "modules_disabled",
544 .data
= &modules_disabled
,
545 .maxlen
= sizeof(int),
547 /* only handle a transition from default "0" to "1" */
548 .proc_handler
= proc_dointvec_minmax
,
553 #ifdef CONFIG_HOTPLUG
555 .procname
= "hotplug",
556 .data
= &uevent_helper
,
557 .maxlen
= UEVENT_HELPER_PATH_LEN
,
559 .proc_handler
= proc_dostring
,
562 #ifdef CONFIG_CHR_DEV_SG
564 .procname
= "sg-big-buff",
565 .data
= &sg_big_buff
,
566 .maxlen
= sizeof (int),
568 .proc_handler
= proc_dointvec
,
571 #ifdef CONFIG_BSD_PROCESS_ACCT
575 .maxlen
= 3*sizeof(int),
577 .proc_handler
= proc_dointvec
,
580 #ifdef CONFIG_MAGIC_SYSRQ
583 .data
= &__sysrq_enabled
,
584 .maxlen
= sizeof (int),
586 .proc_handler
= sysrq_sysctl_handler
,
589 #ifdef CONFIG_PROC_SYSCTL
591 .procname
= "cad_pid",
593 .maxlen
= sizeof (int),
595 .proc_handler
= proc_do_cad_pid
,
599 .procname
= "threads-max",
600 .data
= &max_threads
,
601 .maxlen
= sizeof(int),
603 .proc_handler
= proc_dointvec
,
606 .procname
= "random",
608 .child
= random_table
,
611 .procname
= "usermodehelper",
613 .child
= usermodehelper_table
,
616 .procname
= "overflowuid",
617 .data
= &overflowuid
,
618 .maxlen
= sizeof(int),
620 .proc_handler
= proc_dointvec_minmax
,
621 .extra1
= &minolduid
,
622 .extra2
= &maxolduid
,
625 .procname
= "overflowgid",
626 .data
= &overflowgid
,
627 .maxlen
= sizeof(int),
629 .proc_handler
= proc_dointvec_minmax
,
630 .extra1
= &minolduid
,
631 .extra2
= &maxolduid
,
634 #ifdef CONFIG_MATHEMU
636 .procname
= "ieee_emulation_warnings",
637 .data
= &sysctl_ieee_emulation_warnings
,
638 .maxlen
= sizeof(int),
640 .proc_handler
= proc_dointvec
,
644 .procname
= "userprocess_debug",
645 .data
= &show_unhandled_signals
,
646 .maxlen
= sizeof(int),
648 .proc_handler
= proc_dointvec
,
652 .procname
= "pid_max",
654 .maxlen
= sizeof (int),
656 .proc_handler
= proc_dointvec_minmax
,
657 .extra1
= &pid_max_min
,
658 .extra2
= &pid_max_max
,
661 .procname
= "panic_on_oops",
662 .data
= &panic_on_oops
,
663 .maxlen
= sizeof(int),
665 .proc_handler
= proc_dointvec
,
667 #if defined CONFIG_PRINTK
669 .procname
= "printk",
670 .data
= &console_loglevel
,
671 .maxlen
= 4*sizeof(int),
673 .proc_handler
= proc_dointvec
,
676 .procname
= "printk_ratelimit",
677 .data
= &printk_ratelimit_state
.interval
,
678 .maxlen
= sizeof(int),
680 .proc_handler
= proc_dointvec_jiffies
,
683 .procname
= "printk_ratelimit_burst",
684 .data
= &printk_ratelimit_state
.burst
,
685 .maxlen
= sizeof(int),
687 .proc_handler
= proc_dointvec
,
690 .procname
= "printk_delay",
691 .data
= &printk_delay_msec
,
692 .maxlen
= sizeof(int),
694 .proc_handler
= proc_dointvec_minmax
,
696 .extra2
= &ten_thousand
,
699 .procname
= "dmesg_restrict",
700 .data
= &dmesg_restrict
,
701 .maxlen
= sizeof(int),
703 .proc_handler
= proc_dointvec_minmax
,
708 .procname
= "kptr_restrict",
709 .data
= &kptr_restrict
,
710 .maxlen
= sizeof(int),
712 .proc_handler
= proc_dmesg_restrict
,
718 .procname
= "ngroups_max",
719 .data
= &ngroups_max
,
720 .maxlen
= sizeof (int),
722 .proc_handler
= proc_dointvec
,
725 .procname
= "cap_last_cap",
726 .data
= (void *)&cap_last_cap
,
727 .maxlen
= sizeof(int),
729 .proc_handler
= proc_dointvec
,
731 #if defined(CONFIG_LOCKUP_DETECTOR)
733 .procname
= "watchdog",
734 .data
= &watchdog_enabled
,
735 .maxlen
= sizeof (int),
737 .proc_handler
= proc_dowatchdog
,
742 .procname
= "watchdog_thresh",
743 .data
= &watchdog_thresh
,
744 .maxlen
= sizeof(int),
746 .proc_handler
= proc_dowatchdog
,
751 .procname
= "softlockup_panic",
752 .data
= &softlockup_panic
,
753 .maxlen
= sizeof(int),
755 .proc_handler
= proc_dointvec_minmax
,
760 .procname
= "nmi_watchdog",
761 .data
= &watchdog_enabled
,
762 .maxlen
= sizeof (int),
764 .proc_handler
= proc_dowatchdog
,
769 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
771 .procname
= "unknown_nmi_panic",
772 .data
= &unknown_nmi_panic
,
773 .maxlen
= sizeof (int),
775 .proc_handler
= proc_dointvec
,
778 #if defined(CONFIG_X86)
780 .procname
= "panic_on_unrecovered_nmi",
781 .data
= &panic_on_unrecovered_nmi
,
782 .maxlen
= sizeof(int),
784 .proc_handler
= proc_dointvec
,
787 .procname
= "panic_on_io_nmi",
788 .data
= &panic_on_io_nmi
,
789 .maxlen
= sizeof(int),
791 .proc_handler
= proc_dointvec
,
793 #ifdef CONFIG_DEBUG_STACKOVERFLOW
795 .procname
= "panic_on_stackoverflow",
796 .data
= &sysctl_panic_on_stackoverflow
,
797 .maxlen
= sizeof(int),
799 .proc_handler
= proc_dointvec
,
803 .procname
= "bootloader_type",
804 .data
= &bootloader_type
,
805 .maxlen
= sizeof (int),
807 .proc_handler
= proc_dointvec
,
810 .procname
= "bootloader_version",
811 .data
= &bootloader_version
,
812 .maxlen
= sizeof (int),
814 .proc_handler
= proc_dointvec
,
817 .procname
= "kstack_depth_to_print",
818 .data
= &kstack_depth_to_print
,
819 .maxlen
= sizeof(int),
821 .proc_handler
= proc_dointvec
,
824 .procname
= "io_delay_type",
825 .data
= &io_delay_type
,
826 .maxlen
= sizeof(int),
828 .proc_handler
= proc_dointvec
,
831 #if defined(CONFIG_MMU)
833 .procname
= "randomize_va_space",
834 .data
= &randomize_va_space
,
835 .maxlen
= sizeof(int),
837 .proc_handler
= proc_dointvec
,
840 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
842 .procname
= "spin_retry",
844 .maxlen
= sizeof (int),
846 .proc_handler
= proc_dointvec
,
849 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
851 .procname
= "acpi_video_flags",
852 .data
= &acpi_realmode_flags
,
853 .maxlen
= sizeof (unsigned long),
855 .proc_handler
= proc_doulongvec_minmax
,
860 .procname
= "ignore-unaligned-usertrap",
861 .data
= &no_unaligned_warning
,
862 .maxlen
= sizeof (int),
864 .proc_handler
= proc_dointvec
,
867 .procname
= "unaligned-dump-stack",
868 .data
= &unaligned_dump_stack
,
869 .maxlen
= sizeof (int),
871 .proc_handler
= proc_dointvec
,
874 #ifdef CONFIG_DETECT_HUNG_TASK
876 .procname
= "hung_task_panic",
877 .data
= &sysctl_hung_task_panic
,
878 .maxlen
= sizeof(int),
880 .proc_handler
= proc_dointvec_minmax
,
885 .procname
= "hung_task_check_count",
886 .data
= &sysctl_hung_task_check_count
,
887 .maxlen
= sizeof(unsigned long),
889 .proc_handler
= proc_doulongvec_minmax
,
892 .procname
= "hung_task_timeout_secs",
893 .data
= &sysctl_hung_task_timeout_secs
,
894 .maxlen
= sizeof(unsigned long),
896 .proc_handler
= proc_dohung_task_timeout_secs
,
899 .procname
= "hung_task_warnings",
900 .data
= &sysctl_hung_task_warnings
,
901 .maxlen
= sizeof(unsigned long),
903 .proc_handler
= proc_doulongvec_minmax
,
908 .procname
= "compat-log",
910 .maxlen
= sizeof (int),
912 .proc_handler
= proc_dointvec
,
915 #ifdef CONFIG_RT_MUTEXES
917 .procname
= "max_lock_depth",
918 .data
= &max_lock_depth
,
919 .maxlen
= sizeof(int),
921 .proc_handler
= proc_dointvec
,
925 .procname
= "poweroff_cmd",
926 .data
= &poweroff_cmd
,
927 .maxlen
= POWEROFF_CMD_PATH_LEN
,
929 .proc_handler
= proc_dostring
,
935 .child
= key_sysctls
,
938 #ifdef CONFIG_RCU_TORTURE_TEST
940 .procname
= "rcutorture_runnable",
941 .data
= &rcutorture_runnable
,
942 .maxlen
= sizeof(int),
944 .proc_handler
= proc_dointvec
,
947 #ifdef CONFIG_PERF_EVENTS
949 * User-space scripts rely on the existence of this file
950 * as a feature check for perf_events being enabled.
952 * So it's an ABI, do not remove!
955 .procname
= "perf_event_paranoid",
956 .data
= &sysctl_perf_event_paranoid
,
957 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
959 .proc_handler
= proc_dointvec
,
962 .procname
= "perf_event_mlock_kb",
963 .data
= &sysctl_perf_event_mlock
,
964 .maxlen
= sizeof(sysctl_perf_event_mlock
),
966 .proc_handler
= proc_dointvec
,
969 .procname
= "perf_event_max_sample_rate",
970 .data
= &sysctl_perf_event_sample_rate
,
971 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
973 .proc_handler
= perf_proc_update_handler
,
976 #ifdef CONFIG_KMEMCHECK
978 .procname
= "kmemcheck",
979 .data
= &kmemcheck_enabled
,
980 .maxlen
= sizeof(int),
982 .proc_handler
= proc_dointvec
,
987 .procname
= "blk_iopoll",
988 .data
= &blk_iopoll_enabled
,
989 .maxlen
= sizeof(int),
991 .proc_handler
= proc_dointvec
,
997 static struct ctl_table vm_table
[] = {
999 .procname
= "overcommit_memory",
1000 .data
= &sysctl_overcommit_memory
,
1001 .maxlen
= sizeof(sysctl_overcommit_memory
),
1003 .proc_handler
= proc_dointvec_minmax
,
1008 .procname
= "panic_on_oom",
1009 .data
= &sysctl_panic_on_oom
,
1010 .maxlen
= sizeof(sysctl_panic_on_oom
),
1012 .proc_handler
= proc_dointvec_minmax
,
1017 .procname
= "oom_kill_allocating_task",
1018 .data
= &sysctl_oom_kill_allocating_task
,
1019 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1021 .proc_handler
= proc_dointvec
,
1024 .procname
= "oom_dump_tasks",
1025 .data
= &sysctl_oom_dump_tasks
,
1026 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1028 .proc_handler
= proc_dointvec
,
1031 .procname
= "overcommit_ratio",
1032 .data
= &sysctl_overcommit_ratio
,
1033 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1035 .proc_handler
= proc_dointvec
,
1038 .procname
= "page-cluster",
1039 .data
= &page_cluster
,
1040 .maxlen
= sizeof(int),
1042 .proc_handler
= proc_dointvec_minmax
,
1046 .procname
= "dirty_background_ratio",
1047 .data
= &dirty_background_ratio
,
1048 .maxlen
= sizeof(dirty_background_ratio
),
1050 .proc_handler
= dirty_background_ratio_handler
,
1052 .extra2
= &one_hundred
,
1055 .procname
= "dirty_background_bytes",
1056 .data
= &dirty_background_bytes
,
1057 .maxlen
= sizeof(dirty_background_bytes
),
1059 .proc_handler
= dirty_background_bytes_handler
,
1063 .procname
= "dirty_ratio",
1064 .data
= &vm_dirty_ratio
,
1065 .maxlen
= sizeof(vm_dirty_ratio
),
1067 .proc_handler
= dirty_ratio_handler
,
1069 .extra2
= &one_hundred
,
1072 .procname
= "dirty_bytes",
1073 .data
= &vm_dirty_bytes
,
1074 .maxlen
= sizeof(vm_dirty_bytes
),
1076 .proc_handler
= dirty_bytes_handler
,
1077 .extra1
= &dirty_bytes_min
,
1080 .procname
= "dirty_writeback_centisecs",
1081 .data
= &dirty_writeback_interval
,
1082 .maxlen
= sizeof(dirty_writeback_interval
),
1084 .proc_handler
= dirty_writeback_centisecs_handler
,
1087 .procname
= "dirty_expire_centisecs",
1088 .data
= &dirty_expire_interval
,
1089 .maxlen
= sizeof(dirty_expire_interval
),
1091 .proc_handler
= proc_dointvec_minmax
,
1095 .procname
= "nr_pdflush_threads",
1096 .data
= &nr_pdflush_threads
,
1097 .maxlen
= sizeof nr_pdflush_threads
,
1098 .mode
= 0444 /* read-only*/,
1099 .proc_handler
= proc_dointvec
,
1102 .procname
= "swappiness",
1103 .data
= &vm_swappiness
,
1104 .maxlen
= sizeof(vm_swappiness
),
1106 .proc_handler
= proc_dointvec_minmax
,
1108 .extra2
= &one_hundred
,
1110 #ifdef CONFIG_HUGETLB_PAGE
1112 .procname
= "nr_hugepages",
1114 .maxlen
= sizeof(unsigned long),
1116 .proc_handler
= hugetlb_sysctl_handler
,
1117 .extra1
= (void *)&hugetlb_zero
,
1118 .extra2
= (void *)&hugetlb_infinity
,
1122 .procname
= "nr_hugepages_mempolicy",
1124 .maxlen
= sizeof(unsigned long),
1126 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1127 .extra1
= (void *)&hugetlb_zero
,
1128 .extra2
= (void *)&hugetlb_infinity
,
1132 .procname
= "hugetlb_shm_group",
1133 .data
= &sysctl_hugetlb_shm_group
,
1134 .maxlen
= sizeof(gid_t
),
1136 .proc_handler
= proc_dointvec
,
1139 .procname
= "hugepages_treat_as_movable",
1140 .data
= &hugepages_treat_as_movable
,
1141 .maxlen
= sizeof(int),
1143 .proc_handler
= hugetlb_treat_movable_handler
,
1146 .procname
= "nr_overcommit_hugepages",
1148 .maxlen
= sizeof(unsigned long),
1150 .proc_handler
= hugetlb_overcommit_handler
,
1151 .extra1
= (void *)&hugetlb_zero
,
1152 .extra2
= (void *)&hugetlb_infinity
,
1156 .procname
= "lowmem_reserve_ratio",
1157 .data
= &sysctl_lowmem_reserve_ratio
,
1158 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1160 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1163 .procname
= "drop_caches",
1164 .data
= &sysctl_drop_caches
,
1165 .maxlen
= sizeof(int),
1167 .proc_handler
= drop_caches_sysctl_handler
,
1171 #ifdef CONFIG_COMPACTION
1173 .procname
= "compact_memory",
1174 .data
= &sysctl_compact_memory
,
1175 .maxlen
= sizeof(int),
1177 .proc_handler
= sysctl_compaction_handler
,
1180 .procname
= "extfrag_threshold",
1181 .data
= &sysctl_extfrag_threshold
,
1182 .maxlen
= sizeof(int),
1184 .proc_handler
= sysctl_extfrag_handler
,
1185 .extra1
= &min_extfrag_threshold
,
1186 .extra2
= &max_extfrag_threshold
,
1189 #endif /* CONFIG_COMPACTION */
1191 .procname
= "min_free_kbytes",
1192 .data
= &min_free_kbytes
,
1193 .maxlen
= sizeof(min_free_kbytes
),
1195 .proc_handler
= min_free_kbytes_sysctl_handler
,
1199 .procname
= "percpu_pagelist_fraction",
1200 .data
= &percpu_pagelist_fraction
,
1201 .maxlen
= sizeof(percpu_pagelist_fraction
),
1203 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1204 .extra1
= &min_percpu_pagelist_fract
,
1208 .procname
= "max_map_count",
1209 .data
= &sysctl_max_map_count
,
1210 .maxlen
= sizeof(sysctl_max_map_count
),
1212 .proc_handler
= proc_dointvec_minmax
,
1217 .procname
= "nr_trim_pages",
1218 .data
= &sysctl_nr_trim_pages
,
1219 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1221 .proc_handler
= proc_dointvec_minmax
,
1226 .procname
= "laptop_mode",
1227 .data
= &laptop_mode
,
1228 .maxlen
= sizeof(laptop_mode
),
1230 .proc_handler
= proc_dointvec_jiffies
,
1233 .procname
= "block_dump",
1234 .data
= &block_dump
,
1235 .maxlen
= sizeof(block_dump
),
1237 .proc_handler
= proc_dointvec
,
1241 .procname
= "vfs_cache_pressure",
1242 .data
= &sysctl_vfs_cache_pressure
,
1243 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1245 .proc_handler
= proc_dointvec
,
1248 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1250 .procname
= "legacy_va_layout",
1251 .data
= &sysctl_legacy_va_layout
,
1252 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1254 .proc_handler
= proc_dointvec
,
1260 .procname
= "zone_reclaim_mode",
1261 .data
= &zone_reclaim_mode
,
1262 .maxlen
= sizeof(zone_reclaim_mode
),
1264 .proc_handler
= proc_dointvec
,
1268 .procname
= "min_unmapped_ratio",
1269 .data
= &sysctl_min_unmapped_ratio
,
1270 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1272 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1274 .extra2
= &one_hundred
,
1277 .procname
= "min_slab_ratio",
1278 .data
= &sysctl_min_slab_ratio
,
1279 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1281 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1283 .extra2
= &one_hundred
,
1288 .procname
= "stat_interval",
1289 .data
= &sysctl_stat_interval
,
1290 .maxlen
= sizeof(sysctl_stat_interval
),
1292 .proc_handler
= proc_dointvec_jiffies
,
1297 .procname
= "mmap_min_addr",
1298 .data
= &dac_mmap_min_addr
,
1299 .maxlen
= sizeof(unsigned long),
1301 .proc_handler
= mmap_min_addr_handler
,
1306 .procname
= "numa_zonelist_order",
1307 .data
= &numa_zonelist_order
,
1308 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1310 .proc_handler
= numa_zonelist_order_handler
,
1313 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1314 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1316 .procname
= "vdso_enabled",
1317 .data
= &vdso_enabled
,
1318 .maxlen
= sizeof(vdso_enabled
),
1320 .proc_handler
= proc_dointvec
,
1324 #ifdef CONFIG_HIGHMEM
1326 .procname
= "highmem_is_dirtyable",
1327 .data
= &vm_highmem_is_dirtyable
,
1328 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1330 .proc_handler
= proc_dointvec_minmax
,
1336 .procname
= "scan_unevictable_pages",
1337 .data
= &scan_unevictable_pages
,
1338 .maxlen
= sizeof(scan_unevictable_pages
),
1340 .proc_handler
= scan_unevictable_handler
,
1342 #ifdef CONFIG_MEMORY_FAILURE
1344 .procname
= "memory_failure_early_kill",
1345 .data
= &sysctl_memory_failure_early_kill
,
1346 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1348 .proc_handler
= proc_dointvec_minmax
,
1353 .procname
= "memory_failure_recovery",
1354 .data
= &sysctl_memory_failure_recovery
,
1355 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1357 .proc_handler
= proc_dointvec_minmax
,
1365 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1366 static struct ctl_table binfmt_misc_table
[] = {
1371 static struct ctl_table fs_table
[] = {
1373 .procname
= "inode-nr",
1374 .data
= &inodes_stat
,
1375 .maxlen
= 2*sizeof(int),
1377 .proc_handler
= proc_nr_inodes
,
1380 .procname
= "inode-state",
1381 .data
= &inodes_stat
,
1382 .maxlen
= 7*sizeof(int),
1384 .proc_handler
= proc_nr_inodes
,
1387 .procname
= "file-nr",
1388 .data
= &files_stat
,
1389 .maxlen
= sizeof(files_stat
),
1391 .proc_handler
= proc_nr_files
,
1394 .procname
= "file-max",
1395 .data
= &files_stat
.max_files
,
1396 .maxlen
= sizeof(files_stat
.max_files
),
1398 .proc_handler
= proc_doulongvec_minmax
,
1401 .procname
= "nr_open",
1402 .data
= &sysctl_nr_open
,
1403 .maxlen
= sizeof(int),
1405 .proc_handler
= proc_dointvec_minmax
,
1406 .extra1
= &sysctl_nr_open_min
,
1407 .extra2
= &sysctl_nr_open_max
,
1410 .procname
= "dentry-state",
1411 .data
= &dentry_stat
,
1412 .maxlen
= 6*sizeof(int),
1414 .proc_handler
= proc_nr_dentry
,
1417 .procname
= "overflowuid",
1418 .data
= &fs_overflowuid
,
1419 .maxlen
= sizeof(int),
1421 .proc_handler
= proc_dointvec_minmax
,
1422 .extra1
= &minolduid
,
1423 .extra2
= &maxolduid
,
1426 .procname
= "overflowgid",
1427 .data
= &fs_overflowgid
,
1428 .maxlen
= sizeof(int),
1430 .proc_handler
= proc_dointvec_minmax
,
1431 .extra1
= &minolduid
,
1432 .extra2
= &maxolduid
,
1434 #ifdef CONFIG_FILE_LOCKING
1436 .procname
= "leases-enable",
1437 .data
= &leases_enable
,
1438 .maxlen
= sizeof(int),
1440 .proc_handler
= proc_dointvec
,
1443 #ifdef CONFIG_DNOTIFY
1445 .procname
= "dir-notify-enable",
1446 .data
= &dir_notify_enable
,
1447 .maxlen
= sizeof(int),
1449 .proc_handler
= proc_dointvec
,
1453 #ifdef CONFIG_FILE_LOCKING
1455 .procname
= "lease-break-time",
1456 .data
= &lease_break_time
,
1457 .maxlen
= sizeof(int),
1459 .proc_handler
= proc_dointvec
,
1464 .procname
= "aio-nr",
1466 .maxlen
= sizeof(aio_nr
),
1468 .proc_handler
= proc_doulongvec_minmax
,
1471 .procname
= "aio-max-nr",
1472 .data
= &aio_max_nr
,
1473 .maxlen
= sizeof(aio_max_nr
),
1475 .proc_handler
= proc_doulongvec_minmax
,
1477 #endif /* CONFIG_AIO */
1478 #ifdef CONFIG_INOTIFY_USER
1480 .procname
= "inotify",
1482 .child
= inotify_table
,
1487 .procname
= "epoll",
1489 .child
= epoll_table
,
1494 .procname
= "suid_dumpable",
1495 .data
= &suid_dumpable
,
1496 .maxlen
= sizeof(int),
1498 .proc_handler
= proc_dointvec_minmax
,
1502 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1504 .procname
= "binfmt_misc",
1506 .child
= binfmt_misc_table
,
1510 .procname
= "pipe-max-size",
1511 .data
= &pipe_max_size
,
1512 .maxlen
= sizeof(int),
1514 .proc_handler
= &pipe_proc_fn
,
1515 .extra1
= &pipe_min_size
,
1520 static struct ctl_table debug_table
[] = {
1521 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1522 defined(CONFIG_S390) || defined(CONFIG_TILE)
1524 .procname
= "exception-trace",
1525 .data
= &show_unhandled_signals
,
1526 .maxlen
= sizeof(int),
1528 .proc_handler
= proc_dointvec
1531 #if defined(CONFIG_OPTPROBES)
1533 .procname
= "kprobes-optimization",
1534 .data
= &sysctl_kprobes_optimization
,
1535 .maxlen
= sizeof(int),
1537 .proc_handler
= proc_kprobes_optimization_handler
,
1545 static struct ctl_table dev_table
[] = {
1549 int __init
sysctl_init(void)
1551 register_sysctl_table(sysctl_base_table
);
1555 #endif /* CONFIG_SYSCTL */
1561 #ifdef CONFIG_PROC_SYSCTL
1563 static int _proc_do_string(void* data
, int maxlen
, int write
,
1564 void __user
*buffer
,
1565 size_t *lenp
, loff_t
*ppos
)
1571 if (!data
|| !maxlen
|| !*lenp
) {
1579 while (len
< *lenp
) {
1580 if (get_user(c
, p
++))
1582 if (c
== 0 || c
== '\n')
1588 if(copy_from_user(data
, buffer
, len
))
1590 ((char *) data
)[len
] = 0;
1608 if(copy_to_user(buffer
, data
, len
))
1611 if(put_user('\n', ((char __user
*) buffer
) + len
))
1622 * proc_dostring - read a string sysctl
1623 * @table: the sysctl table
1624 * @write: %TRUE if this is a write to the sysctl file
1625 * @buffer: the user buffer
1626 * @lenp: the size of the user buffer
1627 * @ppos: file position
1629 * Reads/writes a string from/to the user buffer. If the kernel
1630 * buffer provided is not large enough to hold the string, the
1631 * string is truncated. The copied string is %NULL-terminated.
1632 * If the string is being read by the user process, it is copied
1633 * and a newline '\n' is added. It is truncated if the buffer is
1636 * Returns 0 on success.
1638 int proc_dostring(struct ctl_table
*table
, int write
,
1639 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1641 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1642 buffer
, lenp
, ppos
);
1645 static size_t proc_skip_spaces(char **buf
)
1648 char *tmp
= skip_spaces(*buf
);
1654 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1664 #define TMPBUFLEN 22
1666 * proc_get_long - reads an ASCII formatted integer from a user buffer
1668 * @buf: a kernel buffer
1669 * @size: size of the kernel buffer
1670 * @val: this is where the number will be stored
1671 * @neg: set to %TRUE if number is negative
1672 * @perm_tr: a vector which contains the allowed trailers
1673 * @perm_tr_len: size of the perm_tr vector
1674 * @tr: pointer to store the trailer character
1676 * In case of success %0 is returned and @buf and @size are updated with
1677 * the amount of bytes read. If @tr is non-NULL and a trailing
1678 * character exists (size is non-zero after returning from this
1679 * function), @tr is updated with the trailing character.
1681 static int proc_get_long(char **buf
, size_t *size
,
1682 unsigned long *val
, bool *neg
,
1683 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1686 char *p
, tmp
[TMPBUFLEN
];
1692 if (len
> TMPBUFLEN
- 1)
1693 len
= TMPBUFLEN
- 1;
1695 memcpy(tmp
, *buf
, len
);
1699 if (*p
== '-' && *size
> 1) {
1707 *val
= simple_strtoul(p
, &p
, 0);
1711 /* We don't know if the next char is whitespace thus we may accept
1712 * invalid integers (e.g. 1234...a) or two integers instead of one
1713 * (e.g. 123...1). So lets not allow such large numbers. */
1714 if (len
== TMPBUFLEN
- 1)
1717 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1720 if (tr
&& (len
< *size
))
1730 * proc_put_long - converts an integer to a decimal ASCII formatted string
1732 * @buf: the user buffer
1733 * @size: the size of the user buffer
1734 * @val: the integer to be converted
1735 * @neg: sign of the number, %TRUE for negative
1737 * In case of success %0 is returned and @buf and @size are updated with
1738 * the amount of bytes written.
1740 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1744 char tmp
[TMPBUFLEN
], *p
= tmp
;
1746 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1750 if (copy_to_user(*buf
, tmp
, len
))
1758 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1761 char __user
**buffer
= (char __user
**)buf
;
1762 if (put_user(c
, *buffer
))
1764 (*size
)--, (*buffer
)++;
1770 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1772 int write
, void *data
)
1775 *valp
= *negp
? -*lvalp
: *lvalp
;
1780 *lvalp
= (unsigned long)-val
;
1783 *lvalp
= (unsigned long)val
;
1789 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1791 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1792 int write
, void __user
*buffer
,
1793 size_t *lenp
, loff_t
*ppos
,
1794 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1795 int write
, void *data
),
1798 int *i
, vleft
, first
= 1, err
= 0;
1799 unsigned long page
= 0;
1803 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1808 i
= (int *) tbl_data
;
1809 vleft
= table
->maxlen
/ sizeof(*i
);
1813 conv
= do_proc_dointvec_conv
;
1816 if (left
> PAGE_SIZE
- 1)
1817 left
= PAGE_SIZE
- 1;
1818 page
= __get_free_page(GFP_TEMPORARY
);
1819 kbuf
= (char *) page
;
1822 if (copy_from_user(kbuf
, buffer
, left
)) {
1829 for (; left
&& vleft
--; i
++, first
=0) {
1834 left
-= proc_skip_spaces(&kbuf
);
1838 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1840 sizeof(proc_wspace_sep
), NULL
);
1843 if (conv(&neg
, &lval
, i
, 1, data
)) {
1848 if (conv(&neg
, &lval
, i
, 0, data
)) {
1853 err
= proc_put_char(&buffer
, &left
, '\t');
1856 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1862 if (!write
&& !first
&& left
&& !err
)
1863 err
= proc_put_char(&buffer
, &left
, '\n');
1864 if (write
&& !err
&& left
)
1865 left
-= proc_skip_spaces(&kbuf
);
1870 return err
? : -EINVAL
;
1877 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
1878 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1879 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1880 int write
, void *data
),
1883 return __do_proc_dointvec(table
->data
, table
, write
,
1884 buffer
, lenp
, ppos
, conv
, data
);
1888 * proc_dointvec - read a vector of integers
1889 * @table: the sysctl table
1890 * @write: %TRUE if this is a write to the sysctl file
1891 * @buffer: the user buffer
1892 * @lenp: the size of the user buffer
1893 * @ppos: file position
1895 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1896 * values from/to the user buffer, treated as an ASCII string.
1898 * Returns 0 on success.
1900 int proc_dointvec(struct ctl_table
*table
, int write
,
1901 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1903 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
1908 * Taint values can only be increased
1909 * This means we can safely use a temporary.
1911 static int proc_taint(struct ctl_table
*table
, int write
,
1912 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1915 unsigned long tmptaint
= get_taint();
1918 if (write
&& !capable(CAP_SYS_ADMIN
))
1923 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
1929 * Poor man's atomic or. Not worth adding a primitive
1930 * to everyone's atomic.h for this
1933 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
1934 if ((tmptaint
>> i
) & 1)
1942 #ifdef CONFIG_PRINTK
1943 static int proc_dmesg_restrict(struct ctl_table
*table
, int write
,
1944 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1946 if (write
&& !capable(CAP_SYS_ADMIN
))
1949 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
1953 struct do_proc_dointvec_minmax_conv_param
{
1958 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
1960 int write
, void *data
)
1962 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1964 int val
= *negp
? -*lvalp
: *lvalp
;
1965 if ((param
->min
&& *param
->min
> val
) ||
1966 (param
->max
&& *param
->max
< val
))
1973 *lvalp
= (unsigned long)-val
;
1976 *lvalp
= (unsigned long)val
;
1983 * proc_dointvec_minmax - read a vector of integers with min/max values
1984 * @table: the sysctl table
1985 * @write: %TRUE if this is a write to the sysctl file
1986 * @buffer: the user buffer
1987 * @lenp: the size of the user buffer
1988 * @ppos: file position
1990 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1991 * values from/to the user buffer, treated as an ASCII string.
1993 * This routine will ensure the values are within the range specified by
1994 * table->extra1 (min) and table->extra2 (max).
1996 * Returns 0 on success.
1998 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
1999 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2001 struct do_proc_dointvec_minmax_conv_param param
= {
2002 .min
= (int *) table
->extra1
,
2003 .max
= (int *) table
->extra2
,
2005 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2006 do_proc_dointvec_minmax_conv
, ¶m
);
2009 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2010 void __user
*buffer
,
2011 size_t *lenp
, loff_t
*ppos
,
2012 unsigned long convmul
,
2013 unsigned long convdiv
)
2015 unsigned long *i
, *min
, *max
;
2016 int vleft
, first
= 1, err
= 0;
2017 unsigned long page
= 0;
2021 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2026 i
= (unsigned long *) data
;
2027 min
= (unsigned long *) table
->extra1
;
2028 max
= (unsigned long *) table
->extra2
;
2029 vleft
= table
->maxlen
/ sizeof(unsigned long);
2033 if (left
> PAGE_SIZE
- 1)
2034 left
= PAGE_SIZE
- 1;
2035 page
= __get_free_page(GFP_TEMPORARY
);
2036 kbuf
= (char *) page
;
2039 if (copy_from_user(kbuf
, buffer
, left
)) {
2046 for (; left
&& vleft
--; i
++, first
= 0) {
2052 left
-= proc_skip_spaces(&kbuf
);
2054 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2056 sizeof(proc_wspace_sep
), NULL
);
2061 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2065 val
= convdiv
* (*i
) / convmul
;
2067 err
= proc_put_char(&buffer
, &left
, '\t');
2068 err
= proc_put_long(&buffer
, &left
, val
, false);
2074 if (!write
&& !first
&& left
&& !err
)
2075 err
= proc_put_char(&buffer
, &left
, '\n');
2077 left
-= proc_skip_spaces(&kbuf
);
2082 return err
? : -EINVAL
;
2089 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2090 void __user
*buffer
,
2091 size_t *lenp
, loff_t
*ppos
,
2092 unsigned long convmul
,
2093 unsigned long convdiv
)
2095 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2096 buffer
, lenp
, ppos
, convmul
, convdiv
);
2100 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2101 * @table: the sysctl table
2102 * @write: %TRUE if this is a write to the sysctl file
2103 * @buffer: the user buffer
2104 * @lenp: the size of the user buffer
2105 * @ppos: file position
2107 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2108 * values from/to the user buffer, treated as an ASCII string.
2110 * This routine will ensure the values are within the range specified by
2111 * table->extra1 (min) and table->extra2 (max).
2113 * Returns 0 on success.
2115 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2116 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2118 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2122 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2123 * @table: the sysctl table
2124 * @write: %TRUE if this is a write to the sysctl file
2125 * @buffer: the user buffer
2126 * @lenp: the size of the user buffer
2127 * @ppos: file position
2129 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2130 * values from/to the user buffer, treated as an ASCII string. The values
2131 * are treated as milliseconds, and converted to jiffies when they are stored.
2133 * This routine will ensure the values are within the range specified by
2134 * table->extra1 (min) and table->extra2 (max).
2136 * Returns 0 on success.
2138 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2139 void __user
*buffer
,
2140 size_t *lenp
, loff_t
*ppos
)
2142 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2143 lenp
, ppos
, HZ
, 1000l);
2147 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2149 int write
, void *data
)
2152 if (*lvalp
> LONG_MAX
/ HZ
)
2154 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2160 lval
= (unsigned long)-val
;
2163 lval
= (unsigned long)val
;
2170 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2172 int write
, void *data
)
2175 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2177 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2183 lval
= (unsigned long)-val
;
2186 lval
= (unsigned long)val
;
2188 *lvalp
= jiffies_to_clock_t(lval
);
2193 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2195 int write
, void *data
)
2198 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2204 lval
= (unsigned long)-val
;
2207 lval
= (unsigned long)val
;
2209 *lvalp
= jiffies_to_msecs(lval
);
2215 * proc_dointvec_jiffies - read a vector of integers as seconds
2216 * @table: the sysctl table
2217 * @write: %TRUE if this is a write to the sysctl file
2218 * @buffer: the user buffer
2219 * @lenp: the size of the user buffer
2220 * @ppos: file position
2222 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2223 * values from/to the user buffer, treated as an ASCII string.
2224 * The values read are assumed to be in seconds, and are converted into
2227 * Returns 0 on success.
2229 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2230 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2232 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2233 do_proc_dointvec_jiffies_conv
,NULL
);
2237 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2238 * @table: the sysctl table
2239 * @write: %TRUE if this is a write to the sysctl file
2240 * @buffer: the user buffer
2241 * @lenp: the size of the user buffer
2242 * @ppos: pointer to the file position
2244 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2245 * values from/to the user buffer, treated as an ASCII string.
2246 * The values read are assumed to be in 1/USER_HZ seconds, and
2247 * are converted into jiffies.
2249 * Returns 0 on success.
2251 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2252 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2254 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2255 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2259 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2260 * @table: the sysctl table
2261 * @write: %TRUE if this is a write to the sysctl file
2262 * @buffer: the user buffer
2263 * @lenp: the size of the user buffer
2264 * @ppos: file position
2265 * @ppos: the current position in the file
2267 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2268 * values from/to the user buffer, treated as an ASCII string.
2269 * The values read are assumed to be in 1/1000 seconds, and
2270 * are converted into jiffies.
2272 * Returns 0 on success.
2274 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2275 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2277 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2278 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2281 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2282 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2284 struct pid
*new_pid
;
2288 tmp
= pid_vnr(cad_pid
);
2290 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2291 lenp
, ppos
, NULL
, NULL
);
2295 new_pid
= find_get_pid(tmp
);
2299 put_pid(xchg(&cad_pid
, new_pid
));
2304 * proc_do_large_bitmap - read/write from/to a large bitmap
2305 * @table: the sysctl table
2306 * @write: %TRUE if this is a write to the sysctl file
2307 * @buffer: the user buffer
2308 * @lenp: the size of the user buffer
2309 * @ppos: file position
2311 * The bitmap is stored at table->data and the bitmap length (in bits)
2314 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2315 * large bitmaps may be represented in a compact manner. Writing into
2316 * the file will clear the bitmap then update it with the given input.
2318 * Returns 0 on success.
2320 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2321 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2325 size_t left
= *lenp
;
2326 unsigned long bitmap_len
= table
->maxlen
;
2327 unsigned long *bitmap
= (unsigned long *) table
->data
;
2328 unsigned long *tmp_bitmap
= NULL
;
2329 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2331 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2337 unsigned long page
= 0;
2340 if (left
> PAGE_SIZE
- 1)
2341 left
= PAGE_SIZE
- 1;
2343 page
= __get_free_page(GFP_TEMPORARY
);
2344 kbuf
= (char *) page
;
2347 if (copy_from_user(kbuf
, buffer
, left
)) {
2353 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2359 proc_skip_char(&kbuf
, &left
, '\n');
2360 while (!err
&& left
) {
2361 unsigned long val_a
, val_b
;
2364 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2368 if (val_a
>= bitmap_len
|| neg
) {
2380 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2381 &neg
, tr_b
, sizeof(tr_b
),
2385 if (val_b
>= bitmap_len
|| neg
||
2396 while (val_a
<= val_b
)
2397 set_bit(val_a
++, tmp_bitmap
);
2400 proc_skip_char(&kbuf
, &left
, '\n');
2404 unsigned long bit_a
, bit_b
= 0;
2407 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2408 if (bit_a
>= bitmap_len
)
2410 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2414 err
= proc_put_char(&buffer
, &left
, ',');
2418 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2421 if (bit_a
!= bit_b
) {
2422 err
= proc_put_char(&buffer
, &left
, '-');
2425 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2433 err
= proc_put_char(&buffer
, &left
, '\n');
2439 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2441 memcpy(bitmap
, tmp_bitmap
,
2442 BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long));
2454 #else /* CONFIG_PROC_SYSCTL */
2456 int proc_dostring(struct ctl_table
*table
, int write
,
2457 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2462 int proc_dointvec(struct ctl_table
*table
, int write
,
2463 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2468 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2469 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2474 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2475 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2480 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2481 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2486 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2487 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2492 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2493 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2498 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2499 void __user
*buffer
,
2500 size_t *lenp
, loff_t
*ppos
)
2506 #endif /* CONFIG_PROC_SYSCTL */
2509 * No sense putting this after each symbol definition, twice,
2510 * exception granted :-)
2512 EXPORT_SYMBOL(proc_dointvec
);
2513 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2514 EXPORT_SYMBOL(proc_dointvec_minmax
);
2515 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2516 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2517 EXPORT_SYMBOL(proc_dostring
);
2518 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2519 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);