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>
64 #include <linux/sched/sysctl.h>
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
71 #include <asm/stacktrace.h>
75 #include <asm/setup.h>
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
86 #ifdef CONFIG_CHR_DEV_SG
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
95 #if defined(CONFIG_SYSCTL)
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory
;
99 extern int sysctl_overcommit_ratio
;
100 extern int max_threads
;
101 extern int suid_dumpable
;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid
;
104 extern char core_pattern
[];
105 extern unsigned int core_pipe_limit
;
108 extern int pid_max_min
, pid_max_max
;
109 extern int percpu_pagelist_fraction
;
110 extern int compat_log
;
111 extern int latencytop_enabled
;
112 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
114 extern int sysctl_nr_trim_pages
;
117 extern int blk_iopoll_enabled
;
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty
= 60;
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
;
160 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
161 extern int unaligned_enabled
;
165 extern int unaligned_dump_stack
;
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
169 extern int no_unaligned_warning
;
172 #ifdef CONFIG_PROC_SYSCTL
173 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
174 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
175 static int proc_taint(struct ctl_table
*table
, int write
,
176 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
180 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
181 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
184 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
185 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
186 #ifdef CONFIG_COREDUMP
187 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
188 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
191 #ifdef CONFIG_MAGIC_SYSRQ
192 /* Note: sysrq code uses it's own private copy */
193 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
195 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
196 void __user
*buffer
, size_t *lenp
,
201 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
206 sysrq_toggle_support(__sysrq_enabled
);
213 static struct ctl_table kern_table
[];
214 static struct ctl_table vm_table
[];
215 static struct ctl_table fs_table
[];
216 static struct ctl_table debug_table
[];
217 static struct ctl_table dev_table
[];
218 extern struct ctl_table random_table
[];
220 extern struct ctl_table epoll_table
[];
223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
224 int sysctl_legacy_va_layout
;
227 /* The default sysctl tables: */
229 static struct ctl_table sysctl_base_table
[] = {
231 .procname
= "kernel",
248 .child
= debug_table
,
258 #ifdef CONFIG_SCHED_DEBUG
259 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
260 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
261 static int min_wakeup_granularity_ns
; /* 0 usecs */
262 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
264 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
265 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
266 #endif /* CONFIG_SMP */
267 #endif /* CONFIG_SCHED_DEBUG */
269 #ifdef CONFIG_COMPACTION
270 static int min_extfrag_threshold
;
271 static int max_extfrag_threshold
= 1000;
274 static struct ctl_table kern_table
[] = {
276 .procname
= "sched_child_runs_first",
277 .data
= &sysctl_sched_child_runs_first
,
278 .maxlen
= sizeof(unsigned int),
280 .proc_handler
= proc_dointvec
,
282 #ifdef CONFIG_SCHED_DEBUG
284 .procname
= "sched_min_granularity_ns",
285 .data
= &sysctl_sched_min_granularity
,
286 .maxlen
= sizeof(unsigned int),
288 .proc_handler
= sched_proc_update_handler
,
289 .extra1
= &min_sched_granularity_ns
,
290 .extra2
= &max_sched_granularity_ns
,
293 .procname
= "sched_latency_ns",
294 .data
= &sysctl_sched_latency
,
295 .maxlen
= sizeof(unsigned int),
297 .proc_handler
= sched_proc_update_handler
,
298 .extra1
= &min_sched_granularity_ns
,
299 .extra2
= &max_sched_granularity_ns
,
302 .procname
= "sched_wakeup_granularity_ns",
303 .data
= &sysctl_sched_wakeup_granularity
,
304 .maxlen
= sizeof(unsigned int),
306 .proc_handler
= sched_proc_update_handler
,
307 .extra1
= &min_wakeup_granularity_ns
,
308 .extra2
= &max_wakeup_granularity_ns
,
312 .procname
= "sched_tunable_scaling",
313 .data
= &sysctl_sched_tunable_scaling
,
314 .maxlen
= sizeof(enum sched_tunable_scaling
),
316 .proc_handler
= sched_proc_update_handler
,
317 .extra1
= &min_sched_tunable_scaling
,
318 .extra2
= &max_sched_tunable_scaling
,
321 .procname
= "sched_migration_cost_ns",
322 .data
= &sysctl_sched_migration_cost
,
323 .maxlen
= sizeof(unsigned int),
325 .proc_handler
= proc_dointvec
,
328 .procname
= "sched_nr_migrate",
329 .data
= &sysctl_sched_nr_migrate
,
330 .maxlen
= sizeof(unsigned int),
332 .proc_handler
= proc_dointvec
,
335 .procname
= "sched_time_avg_ms",
336 .data
= &sysctl_sched_time_avg
,
337 .maxlen
= sizeof(unsigned int),
339 .proc_handler
= proc_dointvec
,
342 .procname
= "sched_shares_window_ns",
343 .data
= &sysctl_sched_shares_window
,
344 .maxlen
= sizeof(unsigned int),
346 .proc_handler
= proc_dointvec
,
349 .procname
= "timer_migration",
350 .data
= &sysctl_timer_migration
,
351 .maxlen
= sizeof(unsigned int),
353 .proc_handler
= proc_dointvec_minmax
,
357 #endif /* CONFIG_SMP */
358 #ifdef CONFIG_NUMA_BALANCING
360 .procname
= "numa_balancing_scan_delay_ms",
361 .data
= &sysctl_numa_balancing_scan_delay
,
362 .maxlen
= sizeof(unsigned int),
364 .proc_handler
= proc_dointvec
,
367 .procname
= "numa_balancing_scan_period_min_ms",
368 .data
= &sysctl_numa_balancing_scan_period_min
,
369 .maxlen
= sizeof(unsigned int),
371 .proc_handler
= proc_dointvec
,
374 .procname
= "numa_balancing_scan_period_max_ms",
375 .data
= &sysctl_numa_balancing_scan_period_max
,
376 .maxlen
= sizeof(unsigned int),
378 .proc_handler
= proc_dointvec
,
381 .procname
= "numa_balancing_scan_size_mb",
382 .data
= &sysctl_numa_balancing_scan_size
,
383 .maxlen
= sizeof(unsigned int),
385 .proc_handler
= proc_dointvec
,
388 .procname
= "numa_balancing_migrate_deferred",
389 .data
= &sysctl_numa_balancing_migrate_deferred
,
390 .maxlen
= sizeof(unsigned int),
392 .proc_handler
= proc_dointvec
,
394 #endif /* CONFIG_NUMA_BALANCING */
395 #endif /* CONFIG_SCHED_DEBUG */
397 .procname
= "sched_rt_period_us",
398 .data
= &sysctl_sched_rt_period
,
399 .maxlen
= sizeof(unsigned int),
401 .proc_handler
= sched_rt_handler
,
404 .procname
= "sched_rt_runtime_us",
405 .data
= &sysctl_sched_rt_runtime
,
406 .maxlen
= sizeof(int),
408 .proc_handler
= sched_rt_handler
,
411 .procname
= "sched_rr_timeslice_ms",
412 .data
= &sched_rr_timeslice
,
413 .maxlen
= sizeof(int),
415 .proc_handler
= sched_rr_handler
,
417 #ifdef CONFIG_SCHED_AUTOGROUP
419 .procname
= "sched_autogroup_enabled",
420 .data
= &sysctl_sched_autogroup_enabled
,
421 .maxlen
= sizeof(unsigned int),
423 .proc_handler
= proc_dointvec_minmax
,
428 #ifdef CONFIG_CFS_BANDWIDTH
430 .procname
= "sched_cfs_bandwidth_slice_us",
431 .data
= &sysctl_sched_cfs_bandwidth_slice
,
432 .maxlen
= sizeof(unsigned int),
434 .proc_handler
= proc_dointvec_minmax
,
438 #ifdef CONFIG_PROVE_LOCKING
440 .procname
= "prove_locking",
441 .data
= &prove_locking
,
442 .maxlen
= sizeof(int),
444 .proc_handler
= proc_dointvec
,
447 #ifdef CONFIG_LOCK_STAT
449 .procname
= "lock_stat",
451 .maxlen
= sizeof(int),
453 .proc_handler
= proc_dointvec
,
458 .data
= &panic_timeout
,
459 .maxlen
= sizeof(int),
461 .proc_handler
= proc_dointvec
,
463 #ifdef CONFIG_COREDUMP
465 .procname
= "core_uses_pid",
466 .data
= &core_uses_pid
,
467 .maxlen
= sizeof(int),
469 .proc_handler
= proc_dointvec
,
472 .procname
= "core_pattern",
473 .data
= core_pattern
,
474 .maxlen
= CORENAME_MAX_SIZE
,
476 .proc_handler
= proc_dostring_coredump
,
479 .procname
= "core_pipe_limit",
480 .data
= &core_pipe_limit
,
481 .maxlen
= sizeof(unsigned int),
483 .proc_handler
= proc_dointvec
,
486 #ifdef CONFIG_PROC_SYSCTL
488 .procname
= "tainted",
489 .maxlen
= sizeof(long),
491 .proc_handler
= proc_taint
,
494 #ifdef CONFIG_LATENCYTOP
496 .procname
= "latencytop",
497 .data
= &latencytop_enabled
,
498 .maxlen
= sizeof(int),
500 .proc_handler
= proc_dointvec
,
503 #ifdef CONFIG_BLK_DEV_INITRD
505 .procname
= "real-root-dev",
506 .data
= &real_root_dev
,
507 .maxlen
= sizeof(int),
509 .proc_handler
= proc_dointvec
,
513 .procname
= "print-fatal-signals",
514 .data
= &print_fatal_signals
,
515 .maxlen
= sizeof(int),
517 .proc_handler
= proc_dointvec
,
521 .procname
= "reboot-cmd",
522 .data
= reboot_command
,
525 .proc_handler
= proc_dostring
,
528 .procname
= "stop-a",
529 .data
= &stop_a_enabled
,
530 .maxlen
= sizeof (int),
532 .proc_handler
= proc_dointvec
,
535 .procname
= "scons-poweroff",
536 .data
= &scons_pwroff
,
537 .maxlen
= sizeof (int),
539 .proc_handler
= proc_dointvec
,
542 #ifdef CONFIG_SPARC64
544 .procname
= "tsb-ratio",
545 .data
= &sysctl_tsb_ratio
,
546 .maxlen
= sizeof (int),
548 .proc_handler
= proc_dointvec
,
553 .procname
= "soft-power",
554 .data
= &pwrsw_enabled
,
555 .maxlen
= sizeof (int),
557 .proc_handler
= proc_dointvec
,
560 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
562 .procname
= "unaligned-trap",
563 .data
= &unaligned_enabled
,
564 .maxlen
= sizeof (int),
566 .proc_handler
= proc_dointvec
,
570 .procname
= "ctrl-alt-del",
572 .maxlen
= sizeof(int),
574 .proc_handler
= proc_dointvec
,
576 #ifdef CONFIG_FUNCTION_TRACER
578 .procname
= "ftrace_enabled",
579 .data
= &ftrace_enabled
,
580 .maxlen
= sizeof(int),
582 .proc_handler
= ftrace_enable_sysctl
,
585 #ifdef CONFIG_STACK_TRACER
587 .procname
= "stack_tracer_enabled",
588 .data
= &stack_tracer_enabled
,
589 .maxlen
= sizeof(int),
591 .proc_handler
= stack_trace_sysctl
,
594 #ifdef CONFIG_TRACING
596 .procname
= "ftrace_dump_on_oops",
597 .data
= &ftrace_dump_on_oops
,
598 .maxlen
= sizeof(int),
600 .proc_handler
= proc_dointvec
,
603 .procname
= "traceoff_on_warning",
604 .data
= &__disable_trace_on_warning
,
605 .maxlen
= sizeof(__disable_trace_on_warning
),
607 .proc_handler
= proc_dointvec
,
610 #ifdef CONFIG_MODULES
612 .procname
= "modprobe",
613 .data
= &modprobe_path
,
614 .maxlen
= KMOD_PATH_LEN
,
616 .proc_handler
= proc_dostring
,
619 .procname
= "modules_disabled",
620 .data
= &modules_disabled
,
621 .maxlen
= sizeof(int),
623 /* only handle a transition from default "0" to "1" */
624 .proc_handler
= proc_dointvec_minmax
,
631 .procname
= "hotplug",
632 .data
= &uevent_helper
,
633 .maxlen
= UEVENT_HELPER_PATH_LEN
,
635 .proc_handler
= proc_dostring
,
638 #ifdef CONFIG_CHR_DEV_SG
640 .procname
= "sg-big-buff",
641 .data
= &sg_big_buff
,
642 .maxlen
= sizeof (int),
644 .proc_handler
= proc_dointvec
,
647 #ifdef CONFIG_BSD_PROCESS_ACCT
651 .maxlen
= 3*sizeof(int),
653 .proc_handler
= proc_dointvec
,
656 #ifdef CONFIG_MAGIC_SYSRQ
659 .data
= &__sysrq_enabled
,
660 .maxlen
= sizeof (int),
662 .proc_handler
= sysrq_sysctl_handler
,
665 #ifdef CONFIG_PROC_SYSCTL
667 .procname
= "cad_pid",
669 .maxlen
= sizeof (int),
671 .proc_handler
= proc_do_cad_pid
,
675 .procname
= "threads-max",
676 .data
= &max_threads
,
677 .maxlen
= sizeof(int),
679 .proc_handler
= proc_dointvec
,
682 .procname
= "random",
684 .child
= random_table
,
687 .procname
= "usermodehelper",
689 .child
= usermodehelper_table
,
692 .procname
= "overflowuid",
693 .data
= &overflowuid
,
694 .maxlen
= sizeof(int),
696 .proc_handler
= proc_dointvec_minmax
,
697 .extra1
= &minolduid
,
698 .extra2
= &maxolduid
,
701 .procname
= "overflowgid",
702 .data
= &overflowgid
,
703 .maxlen
= sizeof(int),
705 .proc_handler
= proc_dointvec_minmax
,
706 .extra1
= &minolduid
,
707 .extra2
= &maxolduid
,
710 #ifdef CONFIG_MATHEMU
712 .procname
= "ieee_emulation_warnings",
713 .data
= &sysctl_ieee_emulation_warnings
,
714 .maxlen
= sizeof(int),
716 .proc_handler
= proc_dointvec
,
720 .procname
= "userprocess_debug",
721 .data
= &show_unhandled_signals
,
722 .maxlen
= sizeof(int),
724 .proc_handler
= proc_dointvec
,
728 .procname
= "pid_max",
730 .maxlen
= sizeof (int),
732 .proc_handler
= proc_dointvec_minmax
,
733 .extra1
= &pid_max_min
,
734 .extra2
= &pid_max_max
,
737 .procname
= "panic_on_oops",
738 .data
= &panic_on_oops
,
739 .maxlen
= sizeof(int),
741 .proc_handler
= proc_dointvec
,
743 #if defined CONFIG_PRINTK
745 .procname
= "printk",
746 .data
= &console_loglevel
,
747 .maxlen
= 4*sizeof(int),
749 .proc_handler
= proc_dointvec
,
752 .procname
= "printk_ratelimit",
753 .data
= &printk_ratelimit_state
.interval
,
754 .maxlen
= sizeof(int),
756 .proc_handler
= proc_dointvec_jiffies
,
759 .procname
= "printk_ratelimit_burst",
760 .data
= &printk_ratelimit_state
.burst
,
761 .maxlen
= sizeof(int),
763 .proc_handler
= proc_dointvec
,
766 .procname
= "printk_delay",
767 .data
= &printk_delay_msec
,
768 .maxlen
= sizeof(int),
770 .proc_handler
= proc_dointvec_minmax
,
772 .extra2
= &ten_thousand
,
775 .procname
= "dmesg_restrict",
776 .data
= &dmesg_restrict
,
777 .maxlen
= sizeof(int),
779 .proc_handler
= proc_dointvec_minmax_sysadmin
,
784 .procname
= "kptr_restrict",
785 .data
= &kptr_restrict
,
786 .maxlen
= sizeof(int),
788 .proc_handler
= proc_dointvec_minmax_sysadmin
,
794 .procname
= "ngroups_max",
795 .data
= &ngroups_max
,
796 .maxlen
= sizeof (int),
798 .proc_handler
= proc_dointvec
,
801 .procname
= "cap_last_cap",
802 .data
= (void *)&cap_last_cap
,
803 .maxlen
= sizeof(int),
805 .proc_handler
= proc_dointvec
,
807 #if defined(CONFIG_LOCKUP_DETECTOR)
809 .procname
= "watchdog",
810 .data
= &watchdog_user_enabled
,
811 .maxlen
= sizeof (int),
813 .proc_handler
= proc_dowatchdog
,
818 .procname
= "watchdog_thresh",
819 .data
= &watchdog_thresh
,
820 .maxlen
= sizeof(int),
822 .proc_handler
= proc_dowatchdog
,
827 .procname
= "softlockup_panic",
828 .data
= &softlockup_panic
,
829 .maxlen
= sizeof(int),
831 .proc_handler
= proc_dointvec_minmax
,
836 .procname
= "nmi_watchdog",
837 .data
= &watchdog_user_enabled
,
838 .maxlen
= sizeof (int),
840 .proc_handler
= proc_dowatchdog
,
845 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
847 .procname
= "unknown_nmi_panic",
848 .data
= &unknown_nmi_panic
,
849 .maxlen
= sizeof (int),
851 .proc_handler
= proc_dointvec
,
854 #if defined(CONFIG_X86)
856 .procname
= "panic_on_unrecovered_nmi",
857 .data
= &panic_on_unrecovered_nmi
,
858 .maxlen
= sizeof(int),
860 .proc_handler
= proc_dointvec
,
863 .procname
= "panic_on_io_nmi",
864 .data
= &panic_on_io_nmi
,
865 .maxlen
= sizeof(int),
867 .proc_handler
= proc_dointvec
,
869 #ifdef CONFIG_DEBUG_STACKOVERFLOW
871 .procname
= "panic_on_stackoverflow",
872 .data
= &sysctl_panic_on_stackoverflow
,
873 .maxlen
= sizeof(int),
875 .proc_handler
= proc_dointvec
,
879 .procname
= "bootloader_type",
880 .data
= &bootloader_type
,
881 .maxlen
= sizeof (int),
883 .proc_handler
= proc_dointvec
,
886 .procname
= "bootloader_version",
887 .data
= &bootloader_version
,
888 .maxlen
= sizeof (int),
890 .proc_handler
= proc_dointvec
,
893 .procname
= "kstack_depth_to_print",
894 .data
= &kstack_depth_to_print
,
895 .maxlen
= sizeof(int),
897 .proc_handler
= proc_dointvec
,
900 .procname
= "io_delay_type",
901 .data
= &io_delay_type
,
902 .maxlen
= sizeof(int),
904 .proc_handler
= proc_dointvec
,
907 #if defined(CONFIG_MMU)
909 .procname
= "randomize_va_space",
910 .data
= &randomize_va_space
,
911 .maxlen
= sizeof(int),
913 .proc_handler
= proc_dointvec
,
916 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
918 .procname
= "spin_retry",
920 .maxlen
= sizeof (int),
922 .proc_handler
= proc_dointvec
,
925 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
927 .procname
= "acpi_video_flags",
928 .data
= &acpi_realmode_flags
,
929 .maxlen
= sizeof (unsigned long),
931 .proc_handler
= proc_doulongvec_minmax
,
934 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
936 .procname
= "ignore-unaligned-usertrap",
937 .data
= &no_unaligned_warning
,
938 .maxlen
= sizeof (int),
940 .proc_handler
= proc_dointvec
,
945 .procname
= "unaligned-dump-stack",
946 .data
= &unaligned_dump_stack
,
947 .maxlen
= sizeof (int),
949 .proc_handler
= proc_dointvec
,
952 #ifdef CONFIG_DETECT_HUNG_TASK
954 .procname
= "hung_task_panic",
955 .data
= &sysctl_hung_task_panic
,
956 .maxlen
= sizeof(int),
958 .proc_handler
= proc_dointvec_minmax
,
963 .procname
= "hung_task_check_count",
964 .data
= &sysctl_hung_task_check_count
,
965 .maxlen
= sizeof(int),
967 .proc_handler
= proc_dointvec_minmax
,
971 .procname
= "hung_task_timeout_secs",
972 .data
= &sysctl_hung_task_timeout_secs
,
973 .maxlen
= sizeof(unsigned long),
975 .proc_handler
= proc_dohung_task_timeout_secs
,
978 .procname
= "hung_task_warnings",
979 .data
= &sysctl_hung_task_warnings
,
980 .maxlen
= sizeof(unsigned long),
982 .proc_handler
= proc_doulongvec_minmax
,
987 .procname
= "compat-log",
989 .maxlen
= sizeof (int),
991 .proc_handler
= proc_dointvec
,
994 #ifdef CONFIG_RT_MUTEXES
996 .procname
= "max_lock_depth",
997 .data
= &max_lock_depth
,
998 .maxlen
= sizeof(int),
1000 .proc_handler
= proc_dointvec
,
1004 .procname
= "poweroff_cmd",
1005 .data
= &poweroff_cmd
,
1006 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1008 .proc_handler
= proc_dostring
,
1014 .child
= key_sysctls
,
1017 #ifdef CONFIG_RCU_TORTURE_TEST
1019 .procname
= "rcutorture_runnable",
1020 .data
= &rcutorture_runnable
,
1021 .maxlen
= sizeof(int),
1023 .proc_handler
= proc_dointvec
,
1026 #ifdef CONFIG_PERF_EVENTS
1028 * User-space scripts rely on the existence of this file
1029 * as a feature check for perf_events being enabled.
1031 * So it's an ABI, do not remove!
1034 .procname
= "perf_event_paranoid",
1035 .data
= &sysctl_perf_event_paranoid
,
1036 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1038 .proc_handler
= proc_dointvec
,
1041 .procname
= "perf_event_mlock_kb",
1042 .data
= &sysctl_perf_event_mlock
,
1043 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1045 .proc_handler
= proc_dointvec
,
1048 .procname
= "perf_event_max_sample_rate",
1049 .data
= &sysctl_perf_event_sample_rate
,
1050 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1052 .proc_handler
= perf_proc_update_handler
,
1056 .procname
= "perf_cpu_time_max_percent",
1057 .data
= &sysctl_perf_cpu_time_max_percent
,
1058 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1060 .proc_handler
= perf_cpu_time_max_percent_handler
,
1062 .extra2
= &one_hundred
,
1065 #ifdef CONFIG_KMEMCHECK
1067 .procname
= "kmemcheck",
1068 .data
= &kmemcheck_enabled
,
1069 .maxlen
= sizeof(int),
1071 .proc_handler
= proc_dointvec
,
1076 .procname
= "blk_iopoll",
1077 .data
= &blk_iopoll_enabled
,
1078 .maxlen
= sizeof(int),
1080 .proc_handler
= proc_dointvec
,
1086 static struct ctl_table vm_table
[] = {
1088 .procname
= "overcommit_memory",
1089 .data
= &sysctl_overcommit_memory
,
1090 .maxlen
= sizeof(sysctl_overcommit_memory
),
1092 .proc_handler
= proc_dointvec_minmax
,
1097 .procname
= "panic_on_oom",
1098 .data
= &sysctl_panic_on_oom
,
1099 .maxlen
= sizeof(sysctl_panic_on_oom
),
1101 .proc_handler
= proc_dointvec_minmax
,
1106 .procname
= "oom_kill_allocating_task",
1107 .data
= &sysctl_oom_kill_allocating_task
,
1108 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1110 .proc_handler
= proc_dointvec
,
1113 .procname
= "oom_dump_tasks",
1114 .data
= &sysctl_oom_dump_tasks
,
1115 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1117 .proc_handler
= proc_dointvec
,
1120 .procname
= "overcommit_ratio",
1121 .data
= &sysctl_overcommit_ratio
,
1122 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1124 .proc_handler
= proc_dointvec
,
1127 .procname
= "page-cluster",
1128 .data
= &page_cluster
,
1129 .maxlen
= sizeof(int),
1131 .proc_handler
= proc_dointvec_minmax
,
1135 .procname
= "dirty_background_ratio",
1136 .data
= &dirty_background_ratio
,
1137 .maxlen
= sizeof(dirty_background_ratio
),
1139 .proc_handler
= dirty_background_ratio_handler
,
1141 .extra2
= &one_hundred
,
1144 .procname
= "dirty_background_bytes",
1145 .data
= &dirty_background_bytes
,
1146 .maxlen
= sizeof(dirty_background_bytes
),
1148 .proc_handler
= dirty_background_bytes_handler
,
1152 .procname
= "dirty_ratio",
1153 .data
= &vm_dirty_ratio
,
1154 .maxlen
= sizeof(vm_dirty_ratio
),
1156 .proc_handler
= dirty_ratio_handler
,
1158 .extra2
= &one_hundred
,
1161 .procname
= "dirty_bytes",
1162 .data
= &vm_dirty_bytes
,
1163 .maxlen
= sizeof(vm_dirty_bytes
),
1165 .proc_handler
= dirty_bytes_handler
,
1166 .extra1
= &dirty_bytes_min
,
1169 .procname
= "dirty_writeback_centisecs",
1170 .data
= &dirty_writeback_interval
,
1171 .maxlen
= sizeof(dirty_writeback_interval
),
1173 .proc_handler
= dirty_writeback_centisecs_handler
,
1176 .procname
= "dirty_expire_centisecs",
1177 .data
= &dirty_expire_interval
,
1178 .maxlen
= sizeof(dirty_expire_interval
),
1180 .proc_handler
= proc_dointvec_minmax
,
1184 .procname
= "nr_pdflush_threads",
1185 .mode
= 0444 /* read-only */,
1186 .proc_handler
= pdflush_proc_obsolete
,
1189 .procname
= "swappiness",
1190 .data
= &vm_swappiness
,
1191 .maxlen
= sizeof(vm_swappiness
),
1193 .proc_handler
= proc_dointvec_minmax
,
1195 .extra2
= &one_hundred
,
1197 #ifdef CONFIG_HUGETLB_PAGE
1199 .procname
= "nr_hugepages",
1201 .maxlen
= sizeof(unsigned long),
1203 .proc_handler
= hugetlb_sysctl_handler
,
1204 .extra1
= (void *)&hugetlb_zero
,
1205 .extra2
= (void *)&hugetlb_infinity
,
1209 .procname
= "nr_hugepages_mempolicy",
1211 .maxlen
= sizeof(unsigned long),
1213 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1214 .extra1
= (void *)&hugetlb_zero
,
1215 .extra2
= (void *)&hugetlb_infinity
,
1219 .procname
= "hugetlb_shm_group",
1220 .data
= &sysctl_hugetlb_shm_group
,
1221 .maxlen
= sizeof(gid_t
),
1223 .proc_handler
= proc_dointvec
,
1226 .procname
= "hugepages_treat_as_movable",
1227 .data
= &hugepages_treat_as_movable
,
1228 .maxlen
= sizeof(int),
1230 .proc_handler
= proc_dointvec
,
1233 .procname
= "nr_overcommit_hugepages",
1235 .maxlen
= sizeof(unsigned long),
1237 .proc_handler
= hugetlb_overcommit_handler
,
1238 .extra1
= (void *)&hugetlb_zero
,
1239 .extra2
= (void *)&hugetlb_infinity
,
1243 .procname
= "lowmem_reserve_ratio",
1244 .data
= &sysctl_lowmem_reserve_ratio
,
1245 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1247 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1250 .procname
= "drop_caches",
1251 .data
= &sysctl_drop_caches
,
1252 .maxlen
= sizeof(int),
1254 .proc_handler
= drop_caches_sysctl_handler
,
1258 #ifdef CONFIG_COMPACTION
1260 .procname
= "compact_memory",
1261 .data
= &sysctl_compact_memory
,
1262 .maxlen
= sizeof(int),
1264 .proc_handler
= sysctl_compaction_handler
,
1267 .procname
= "extfrag_threshold",
1268 .data
= &sysctl_extfrag_threshold
,
1269 .maxlen
= sizeof(int),
1271 .proc_handler
= sysctl_extfrag_handler
,
1272 .extra1
= &min_extfrag_threshold
,
1273 .extra2
= &max_extfrag_threshold
,
1276 #endif /* CONFIG_COMPACTION */
1278 .procname
= "min_free_kbytes",
1279 .data
= &min_free_kbytes
,
1280 .maxlen
= sizeof(min_free_kbytes
),
1282 .proc_handler
= min_free_kbytes_sysctl_handler
,
1286 .procname
= "percpu_pagelist_fraction",
1287 .data
= &percpu_pagelist_fraction
,
1288 .maxlen
= sizeof(percpu_pagelist_fraction
),
1290 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1291 .extra1
= &min_percpu_pagelist_fract
,
1295 .procname
= "max_map_count",
1296 .data
= &sysctl_max_map_count
,
1297 .maxlen
= sizeof(sysctl_max_map_count
),
1299 .proc_handler
= proc_dointvec_minmax
,
1304 .procname
= "nr_trim_pages",
1305 .data
= &sysctl_nr_trim_pages
,
1306 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1308 .proc_handler
= proc_dointvec_minmax
,
1313 .procname
= "laptop_mode",
1314 .data
= &laptop_mode
,
1315 .maxlen
= sizeof(laptop_mode
),
1317 .proc_handler
= proc_dointvec_jiffies
,
1320 .procname
= "block_dump",
1321 .data
= &block_dump
,
1322 .maxlen
= sizeof(block_dump
),
1324 .proc_handler
= proc_dointvec
,
1328 .procname
= "vfs_cache_pressure",
1329 .data
= &sysctl_vfs_cache_pressure
,
1330 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1332 .proc_handler
= proc_dointvec
,
1335 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1337 .procname
= "legacy_va_layout",
1338 .data
= &sysctl_legacy_va_layout
,
1339 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1341 .proc_handler
= proc_dointvec
,
1347 .procname
= "zone_reclaim_mode",
1348 .data
= &zone_reclaim_mode
,
1349 .maxlen
= sizeof(zone_reclaim_mode
),
1351 .proc_handler
= proc_dointvec
,
1355 .procname
= "min_unmapped_ratio",
1356 .data
= &sysctl_min_unmapped_ratio
,
1357 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1359 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1361 .extra2
= &one_hundred
,
1364 .procname
= "min_slab_ratio",
1365 .data
= &sysctl_min_slab_ratio
,
1366 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1368 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1370 .extra2
= &one_hundred
,
1375 .procname
= "stat_interval",
1376 .data
= &sysctl_stat_interval
,
1377 .maxlen
= sizeof(sysctl_stat_interval
),
1379 .proc_handler
= proc_dointvec_jiffies
,
1384 .procname
= "mmap_min_addr",
1385 .data
= &dac_mmap_min_addr
,
1386 .maxlen
= sizeof(unsigned long),
1388 .proc_handler
= mmap_min_addr_handler
,
1393 .procname
= "numa_zonelist_order",
1394 .data
= &numa_zonelist_order
,
1395 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1397 .proc_handler
= numa_zonelist_order_handler
,
1400 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1401 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1403 .procname
= "vdso_enabled",
1404 .data
= &vdso_enabled
,
1405 .maxlen
= sizeof(vdso_enabled
),
1407 .proc_handler
= proc_dointvec
,
1411 #ifdef CONFIG_HIGHMEM
1413 .procname
= "highmem_is_dirtyable",
1414 .data
= &vm_highmem_is_dirtyable
,
1415 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1417 .proc_handler
= proc_dointvec_minmax
,
1423 .procname
= "scan_unevictable_pages",
1424 .data
= &scan_unevictable_pages
,
1425 .maxlen
= sizeof(scan_unevictable_pages
),
1427 .proc_handler
= scan_unevictable_handler
,
1429 #ifdef CONFIG_MEMORY_FAILURE
1431 .procname
= "memory_failure_early_kill",
1432 .data
= &sysctl_memory_failure_early_kill
,
1433 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1435 .proc_handler
= proc_dointvec_minmax
,
1440 .procname
= "memory_failure_recovery",
1441 .data
= &sysctl_memory_failure_recovery
,
1442 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1444 .proc_handler
= proc_dointvec_minmax
,
1450 .procname
= "user_reserve_kbytes",
1451 .data
= &sysctl_user_reserve_kbytes
,
1452 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1454 .proc_handler
= proc_doulongvec_minmax
,
1457 .procname
= "admin_reserve_kbytes",
1458 .data
= &sysctl_admin_reserve_kbytes
,
1459 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1461 .proc_handler
= proc_doulongvec_minmax
,
1466 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1467 static struct ctl_table binfmt_misc_table
[] = {
1472 static struct ctl_table fs_table
[] = {
1474 .procname
= "inode-nr",
1475 .data
= &inodes_stat
,
1476 .maxlen
= 2*sizeof(long),
1478 .proc_handler
= proc_nr_inodes
,
1481 .procname
= "inode-state",
1482 .data
= &inodes_stat
,
1483 .maxlen
= 7*sizeof(long),
1485 .proc_handler
= proc_nr_inodes
,
1488 .procname
= "file-nr",
1489 .data
= &files_stat
,
1490 .maxlen
= sizeof(files_stat
),
1492 .proc_handler
= proc_nr_files
,
1495 .procname
= "file-max",
1496 .data
= &files_stat
.max_files
,
1497 .maxlen
= sizeof(files_stat
.max_files
),
1499 .proc_handler
= proc_doulongvec_minmax
,
1502 .procname
= "nr_open",
1503 .data
= &sysctl_nr_open
,
1504 .maxlen
= sizeof(int),
1506 .proc_handler
= proc_dointvec_minmax
,
1507 .extra1
= &sysctl_nr_open_min
,
1508 .extra2
= &sysctl_nr_open_max
,
1511 .procname
= "dentry-state",
1512 .data
= &dentry_stat
,
1513 .maxlen
= 6*sizeof(long),
1515 .proc_handler
= proc_nr_dentry
,
1518 .procname
= "overflowuid",
1519 .data
= &fs_overflowuid
,
1520 .maxlen
= sizeof(int),
1522 .proc_handler
= proc_dointvec_minmax
,
1523 .extra1
= &minolduid
,
1524 .extra2
= &maxolduid
,
1527 .procname
= "overflowgid",
1528 .data
= &fs_overflowgid
,
1529 .maxlen
= sizeof(int),
1531 .proc_handler
= proc_dointvec_minmax
,
1532 .extra1
= &minolduid
,
1533 .extra2
= &maxolduid
,
1535 #ifdef CONFIG_FILE_LOCKING
1537 .procname
= "leases-enable",
1538 .data
= &leases_enable
,
1539 .maxlen
= sizeof(int),
1541 .proc_handler
= proc_dointvec
,
1544 #ifdef CONFIG_DNOTIFY
1546 .procname
= "dir-notify-enable",
1547 .data
= &dir_notify_enable
,
1548 .maxlen
= sizeof(int),
1550 .proc_handler
= proc_dointvec
,
1554 #ifdef CONFIG_FILE_LOCKING
1556 .procname
= "lease-break-time",
1557 .data
= &lease_break_time
,
1558 .maxlen
= sizeof(int),
1560 .proc_handler
= proc_dointvec
,
1565 .procname
= "aio-nr",
1567 .maxlen
= sizeof(aio_nr
),
1569 .proc_handler
= proc_doulongvec_minmax
,
1572 .procname
= "aio-max-nr",
1573 .data
= &aio_max_nr
,
1574 .maxlen
= sizeof(aio_max_nr
),
1576 .proc_handler
= proc_doulongvec_minmax
,
1578 #endif /* CONFIG_AIO */
1579 #ifdef CONFIG_INOTIFY_USER
1581 .procname
= "inotify",
1583 .child
= inotify_table
,
1588 .procname
= "epoll",
1590 .child
= epoll_table
,
1595 .procname
= "protected_symlinks",
1596 .data
= &sysctl_protected_symlinks
,
1597 .maxlen
= sizeof(int),
1599 .proc_handler
= proc_dointvec_minmax
,
1604 .procname
= "protected_hardlinks",
1605 .data
= &sysctl_protected_hardlinks
,
1606 .maxlen
= sizeof(int),
1608 .proc_handler
= proc_dointvec_minmax
,
1613 .procname
= "suid_dumpable",
1614 .data
= &suid_dumpable
,
1615 .maxlen
= sizeof(int),
1617 .proc_handler
= proc_dointvec_minmax_coredump
,
1621 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1623 .procname
= "binfmt_misc",
1625 .child
= binfmt_misc_table
,
1629 .procname
= "pipe-max-size",
1630 .data
= &pipe_max_size
,
1631 .maxlen
= sizeof(int),
1633 .proc_handler
= &pipe_proc_fn
,
1634 .extra1
= &pipe_min_size
,
1639 static struct ctl_table debug_table
[] = {
1640 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1642 .procname
= "exception-trace",
1643 .data
= &show_unhandled_signals
,
1644 .maxlen
= sizeof(int),
1646 .proc_handler
= proc_dointvec
1649 #if defined(CONFIG_OPTPROBES)
1651 .procname
= "kprobes-optimization",
1652 .data
= &sysctl_kprobes_optimization
,
1653 .maxlen
= sizeof(int),
1655 .proc_handler
= proc_kprobes_optimization_handler
,
1663 static struct ctl_table dev_table
[] = {
1667 int __init
sysctl_init(void)
1669 struct ctl_table_header
*hdr
;
1671 hdr
= register_sysctl_table(sysctl_base_table
);
1672 kmemleak_not_leak(hdr
);
1676 #endif /* CONFIG_SYSCTL */
1682 #ifdef CONFIG_PROC_SYSCTL
1684 static int _proc_do_string(void* data
, int maxlen
, int write
,
1685 void __user
*buffer
,
1686 size_t *lenp
, loff_t
*ppos
)
1692 if (!data
|| !maxlen
|| !*lenp
) {
1700 while (len
< *lenp
) {
1701 if (get_user(c
, p
++))
1703 if (c
== 0 || c
== '\n')
1709 if(copy_from_user(data
, buffer
, len
))
1711 ((char *) data
)[len
] = 0;
1729 if(copy_to_user(buffer
, data
, len
))
1732 if(put_user('\n', ((char __user
*) buffer
) + len
))
1743 * proc_dostring - read a string sysctl
1744 * @table: the sysctl table
1745 * @write: %TRUE if this is a write to the sysctl file
1746 * @buffer: the user buffer
1747 * @lenp: the size of the user buffer
1748 * @ppos: file position
1750 * Reads/writes a string from/to the user buffer. If the kernel
1751 * buffer provided is not large enough to hold the string, the
1752 * string is truncated. The copied string is %NULL-terminated.
1753 * If the string is being read by the user process, it is copied
1754 * and a newline '\n' is added. It is truncated if the buffer is
1757 * Returns 0 on success.
1759 int proc_dostring(struct ctl_table
*table
, int write
,
1760 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1762 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1763 buffer
, lenp
, ppos
);
1766 static size_t proc_skip_spaces(char **buf
)
1769 char *tmp
= skip_spaces(*buf
);
1775 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1785 #define TMPBUFLEN 22
1787 * proc_get_long - reads an ASCII formatted integer from a user buffer
1789 * @buf: a kernel buffer
1790 * @size: size of the kernel buffer
1791 * @val: this is where the number will be stored
1792 * @neg: set to %TRUE if number is negative
1793 * @perm_tr: a vector which contains the allowed trailers
1794 * @perm_tr_len: size of the perm_tr vector
1795 * @tr: pointer to store the trailer character
1797 * In case of success %0 is returned and @buf and @size are updated with
1798 * the amount of bytes read. If @tr is non-NULL and a trailing
1799 * character exists (size is non-zero after returning from this
1800 * function), @tr is updated with the trailing character.
1802 static int proc_get_long(char **buf
, size_t *size
,
1803 unsigned long *val
, bool *neg
,
1804 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1807 char *p
, tmp
[TMPBUFLEN
];
1813 if (len
> TMPBUFLEN
- 1)
1814 len
= TMPBUFLEN
- 1;
1816 memcpy(tmp
, *buf
, len
);
1820 if (*p
== '-' && *size
> 1) {
1828 *val
= simple_strtoul(p
, &p
, 0);
1832 /* We don't know if the next char is whitespace thus we may accept
1833 * invalid integers (e.g. 1234...a) or two integers instead of one
1834 * (e.g. 123...1). So lets not allow such large numbers. */
1835 if (len
== TMPBUFLEN
- 1)
1838 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1841 if (tr
&& (len
< *size
))
1851 * proc_put_long - converts an integer to a decimal ASCII formatted string
1853 * @buf: the user buffer
1854 * @size: the size of the user buffer
1855 * @val: the integer to be converted
1856 * @neg: sign of the number, %TRUE for negative
1858 * In case of success %0 is returned and @buf and @size are updated with
1859 * the amount of bytes written.
1861 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1865 char tmp
[TMPBUFLEN
], *p
= tmp
;
1867 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1871 if (copy_to_user(*buf
, tmp
, len
))
1879 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1882 char __user
**buffer
= (char __user
**)buf
;
1883 if (put_user(c
, *buffer
))
1885 (*size
)--, (*buffer
)++;
1891 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1893 int write
, void *data
)
1896 *valp
= *negp
? -*lvalp
: *lvalp
;
1901 *lvalp
= (unsigned long)-val
;
1904 *lvalp
= (unsigned long)val
;
1910 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1912 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1913 int write
, void __user
*buffer
,
1914 size_t *lenp
, loff_t
*ppos
,
1915 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1916 int write
, void *data
),
1919 int *i
, vleft
, first
= 1, err
= 0;
1920 unsigned long page
= 0;
1924 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1929 i
= (int *) tbl_data
;
1930 vleft
= table
->maxlen
/ sizeof(*i
);
1934 conv
= do_proc_dointvec_conv
;
1937 if (left
> PAGE_SIZE
- 1)
1938 left
= PAGE_SIZE
- 1;
1939 page
= __get_free_page(GFP_TEMPORARY
);
1940 kbuf
= (char *) page
;
1943 if (copy_from_user(kbuf
, buffer
, left
)) {
1950 for (; left
&& vleft
--; i
++, first
=0) {
1955 left
-= proc_skip_spaces(&kbuf
);
1959 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1961 sizeof(proc_wspace_sep
), NULL
);
1964 if (conv(&neg
, &lval
, i
, 1, data
)) {
1969 if (conv(&neg
, &lval
, i
, 0, data
)) {
1974 err
= proc_put_char(&buffer
, &left
, '\t');
1977 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1983 if (!write
&& !first
&& left
&& !err
)
1984 err
= proc_put_char(&buffer
, &left
, '\n');
1985 if (write
&& !err
&& left
)
1986 left
-= proc_skip_spaces(&kbuf
);
1991 return err
? : -EINVAL
;
1998 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
1999 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2000 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2001 int write
, void *data
),
2004 return __do_proc_dointvec(table
->data
, table
, write
,
2005 buffer
, lenp
, ppos
, conv
, data
);
2009 * proc_dointvec - read a vector of integers
2010 * @table: the sysctl table
2011 * @write: %TRUE if this is a write to the sysctl file
2012 * @buffer: the user buffer
2013 * @lenp: the size of the user buffer
2014 * @ppos: file position
2016 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2017 * values from/to the user buffer, treated as an ASCII string.
2019 * Returns 0 on success.
2021 int proc_dointvec(struct ctl_table
*table
, int write
,
2022 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2024 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2029 * Taint values can only be increased
2030 * This means we can safely use a temporary.
2032 static int proc_taint(struct ctl_table
*table
, int write
,
2033 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2036 unsigned long tmptaint
= get_taint();
2039 if (write
&& !capable(CAP_SYS_ADMIN
))
2044 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2050 * Poor man's atomic or. Not worth adding a primitive
2051 * to everyone's atomic.h for this
2054 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2055 if ((tmptaint
>> i
) & 1)
2056 add_taint(i
, LOCKDEP_STILL_OK
);
2063 #ifdef CONFIG_PRINTK
2064 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2065 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2067 if (write
&& !capable(CAP_SYS_ADMIN
))
2070 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2074 struct do_proc_dointvec_minmax_conv_param
{
2079 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2081 int write
, void *data
)
2083 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2085 int val
= *negp
? -*lvalp
: *lvalp
;
2086 if ((param
->min
&& *param
->min
> val
) ||
2087 (param
->max
&& *param
->max
< val
))
2094 *lvalp
= (unsigned long)-val
;
2097 *lvalp
= (unsigned long)val
;
2104 * proc_dointvec_minmax - read a vector of integers with min/max values
2105 * @table: the sysctl table
2106 * @write: %TRUE if this is a write to the sysctl file
2107 * @buffer: the user buffer
2108 * @lenp: the size of the user buffer
2109 * @ppos: file position
2111 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2112 * values from/to the user buffer, treated as an ASCII string.
2114 * This routine will ensure the values are within the range specified by
2115 * table->extra1 (min) and table->extra2 (max).
2117 * Returns 0 on success.
2119 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2120 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2122 struct do_proc_dointvec_minmax_conv_param param
= {
2123 .min
= (int *) table
->extra1
,
2124 .max
= (int *) table
->extra2
,
2126 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2127 do_proc_dointvec_minmax_conv
, ¶m
);
2130 static void validate_coredump_safety(void)
2132 #ifdef CONFIG_COREDUMP
2133 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2134 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2135 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2136 "suid_dumpable=2. Pipe handler or fully qualified "\
2137 "core dump path required.\n");
2142 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2143 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2145 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2147 validate_coredump_safety();
2151 #ifdef CONFIG_COREDUMP
2152 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2155 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2157 validate_coredump_safety();
2162 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2163 void __user
*buffer
,
2164 size_t *lenp
, loff_t
*ppos
,
2165 unsigned long convmul
,
2166 unsigned long convdiv
)
2168 unsigned long *i
, *min
, *max
;
2169 int vleft
, first
= 1, err
= 0;
2170 unsigned long page
= 0;
2174 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2179 i
= (unsigned long *) data
;
2180 min
= (unsigned long *) table
->extra1
;
2181 max
= (unsigned long *) table
->extra2
;
2182 vleft
= table
->maxlen
/ sizeof(unsigned long);
2186 if (left
> PAGE_SIZE
- 1)
2187 left
= PAGE_SIZE
- 1;
2188 page
= __get_free_page(GFP_TEMPORARY
);
2189 kbuf
= (char *) page
;
2192 if (copy_from_user(kbuf
, buffer
, left
)) {
2199 for (; left
&& vleft
--; i
++, first
= 0) {
2205 left
-= proc_skip_spaces(&kbuf
);
2207 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2209 sizeof(proc_wspace_sep
), NULL
);
2214 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2218 val
= convdiv
* (*i
) / convmul
;
2220 err
= proc_put_char(&buffer
, &left
, '\t');
2224 err
= proc_put_long(&buffer
, &left
, val
, false);
2230 if (!write
&& !first
&& left
&& !err
)
2231 err
= proc_put_char(&buffer
, &left
, '\n');
2233 left
-= proc_skip_spaces(&kbuf
);
2238 return err
? : -EINVAL
;
2245 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2246 void __user
*buffer
,
2247 size_t *lenp
, loff_t
*ppos
,
2248 unsigned long convmul
,
2249 unsigned long convdiv
)
2251 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2252 buffer
, lenp
, ppos
, convmul
, convdiv
);
2256 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2257 * @table: the sysctl table
2258 * @write: %TRUE if this is a write to the sysctl file
2259 * @buffer: the user buffer
2260 * @lenp: the size of the user buffer
2261 * @ppos: file position
2263 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2264 * values from/to the user buffer, treated as an ASCII string.
2266 * This routine will ensure the values are within the range specified by
2267 * table->extra1 (min) and table->extra2 (max).
2269 * Returns 0 on success.
2271 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2272 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2274 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2278 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2279 * @table: the sysctl table
2280 * @write: %TRUE if this is a write to the sysctl file
2281 * @buffer: the user buffer
2282 * @lenp: the size of the user buffer
2283 * @ppos: file position
2285 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2286 * values from/to the user buffer, treated as an ASCII string. The values
2287 * are treated as milliseconds, and converted to jiffies when they are stored.
2289 * This routine will ensure the values are within the range specified by
2290 * table->extra1 (min) and table->extra2 (max).
2292 * Returns 0 on success.
2294 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2295 void __user
*buffer
,
2296 size_t *lenp
, loff_t
*ppos
)
2298 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2299 lenp
, ppos
, HZ
, 1000l);
2303 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2305 int write
, void *data
)
2308 if (*lvalp
> LONG_MAX
/ HZ
)
2310 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2316 lval
= (unsigned long)-val
;
2319 lval
= (unsigned long)val
;
2326 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2328 int write
, void *data
)
2331 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2333 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2339 lval
= (unsigned long)-val
;
2342 lval
= (unsigned long)val
;
2344 *lvalp
= jiffies_to_clock_t(lval
);
2349 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2351 int write
, void *data
)
2354 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2364 lval
= (unsigned long)-val
;
2367 lval
= (unsigned long)val
;
2369 *lvalp
= jiffies_to_msecs(lval
);
2375 * proc_dointvec_jiffies - read a vector of integers as seconds
2376 * @table: the sysctl table
2377 * @write: %TRUE if this is a write to the sysctl file
2378 * @buffer: the user buffer
2379 * @lenp: the size of the user buffer
2380 * @ppos: file position
2382 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2383 * values from/to the user buffer, treated as an ASCII string.
2384 * The values read are assumed to be in seconds, and are converted into
2387 * Returns 0 on success.
2389 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2390 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2392 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2393 do_proc_dointvec_jiffies_conv
,NULL
);
2397 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2398 * @table: the sysctl table
2399 * @write: %TRUE if this is a write to the sysctl file
2400 * @buffer: the user buffer
2401 * @lenp: the size of the user buffer
2402 * @ppos: pointer to the file position
2404 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2405 * values from/to the user buffer, treated as an ASCII string.
2406 * The values read are assumed to be in 1/USER_HZ seconds, and
2407 * are converted into jiffies.
2409 * Returns 0 on success.
2411 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2412 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2414 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2415 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2419 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2420 * @table: the sysctl table
2421 * @write: %TRUE if this is a write to the sysctl file
2422 * @buffer: the user buffer
2423 * @lenp: the size of the user buffer
2424 * @ppos: file position
2425 * @ppos: the current position in the file
2427 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2428 * values from/to the user buffer, treated as an ASCII string.
2429 * The values read are assumed to be in 1/1000 seconds, and
2430 * are converted into jiffies.
2432 * Returns 0 on success.
2434 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2435 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2437 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2438 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2441 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2442 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2444 struct pid
*new_pid
;
2448 tmp
= pid_vnr(cad_pid
);
2450 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2451 lenp
, ppos
, NULL
, NULL
);
2455 new_pid
= find_get_pid(tmp
);
2459 put_pid(xchg(&cad_pid
, new_pid
));
2464 * proc_do_large_bitmap - read/write from/to a large bitmap
2465 * @table: the sysctl table
2466 * @write: %TRUE if this is a write to the sysctl file
2467 * @buffer: the user buffer
2468 * @lenp: the size of the user buffer
2469 * @ppos: file position
2471 * The bitmap is stored at table->data and the bitmap length (in bits)
2474 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2475 * large bitmaps may be represented in a compact manner. Writing into
2476 * the file will clear the bitmap then update it with the given input.
2478 * Returns 0 on success.
2480 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2481 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2485 size_t left
= *lenp
;
2486 unsigned long bitmap_len
= table
->maxlen
;
2487 unsigned long *bitmap
= (unsigned long *) table
->data
;
2488 unsigned long *tmp_bitmap
= NULL
;
2489 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2491 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2497 unsigned long page
= 0;
2500 if (left
> PAGE_SIZE
- 1)
2501 left
= PAGE_SIZE
- 1;
2503 page
= __get_free_page(GFP_TEMPORARY
);
2504 kbuf
= (char *) page
;
2507 if (copy_from_user(kbuf
, buffer
, left
)) {
2513 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2519 proc_skip_char(&kbuf
, &left
, '\n');
2520 while (!err
&& left
) {
2521 unsigned long val_a
, val_b
;
2524 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2528 if (val_a
>= bitmap_len
|| neg
) {
2540 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2541 &neg
, tr_b
, sizeof(tr_b
),
2545 if (val_b
>= bitmap_len
|| neg
||
2556 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2558 proc_skip_char(&kbuf
, &left
, '\n');
2562 unsigned long bit_a
, bit_b
= 0;
2565 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2566 if (bit_a
>= bitmap_len
)
2568 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2572 err
= proc_put_char(&buffer
, &left
, ',');
2576 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2579 if (bit_a
!= bit_b
) {
2580 err
= proc_put_char(&buffer
, &left
, '-');
2583 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2591 err
= proc_put_char(&buffer
, &left
, '\n');
2597 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2599 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2611 #else /* CONFIG_PROC_SYSCTL */
2613 int proc_dostring(struct ctl_table
*table
, int write
,
2614 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2619 int proc_dointvec(struct ctl_table
*table
, int write
,
2620 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2625 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2626 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2631 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2632 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2637 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2638 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2643 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2644 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2649 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2650 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2655 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2656 void __user
*buffer
,
2657 size_t *lenp
, loff_t
*ppos
)
2663 #endif /* CONFIG_PROC_SYSCTL */
2666 * No sense putting this after each symbol definition, twice,
2667 * exception granted :-)
2669 EXPORT_SYMBOL(proc_dointvec
);
2670 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2671 EXPORT_SYMBOL(proc_dointvec_minmax
);
2672 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2673 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2674 EXPORT_SYMBOL(proc_dostring
);
2675 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2676 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);