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>
65 #include <linux/kexec.h>
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
72 #include <asm/stacktrace.h>
76 #include <asm/setup.h>
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
87 #ifdef CONFIG_CHR_DEV_SG
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
96 #if defined(CONFIG_SYSCTL)
98 /* External variables not in a header file. */
99 extern int max_threads
;
100 extern int suid_dumpable
;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid
;
103 extern char core_pattern
[];
104 extern unsigned int core_pipe_limit
;
107 extern int pid_max_min
, pid_max_max
;
108 extern int percpu_pagelist_fraction
;
109 extern int compat_log
;
110 extern int latencytop_enabled
;
111 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
113 extern int sysctl_nr_trim_pages
;
116 extern int blk_iopoll_enabled
;
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty
= 60;
125 static int __maybe_unused one
= 1;
126 static int __maybe_unused two
= 2;
127 static int __maybe_unused three
= 3;
128 static unsigned long one_ul
= 1;
129 static int one_hundred
= 100;
131 static int ten_thousand
= 10000;
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid
= 65535;
139 static int minolduid
;
140 static int min_percpu_pagelist_fract
= 8;
142 static int ngroups_max
= NGROUPS_MAX
;
143 static const int cap_last_cap
= CAP_LAST_CAP
;
145 #ifdef CONFIG_INOTIFY_USER
146 #include <linux/inotify.h>
151 #ifdef CONFIG_SPARC64
152 extern int sysctl_tsb_ratio
;
156 extern int pwrsw_enabled
;
159 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
160 extern int unaligned_enabled
;
164 extern int unaligned_dump_stack
;
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
168 extern int no_unaligned_warning
;
171 #ifdef CONFIG_PROC_SYSCTL
172 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
173 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
174 static int proc_taint(struct ctl_table
*table
, int write
,
175 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
179 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
180 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
183 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
184 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
185 #ifdef CONFIG_COREDUMP
186 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
187 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
190 #ifdef CONFIG_MAGIC_SYSRQ
191 /* Note: sysrq code uses it's own private copy */
192 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
194 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
195 void __user
*buffer
, size_t *lenp
,
200 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
205 sysrq_toggle_support(__sysrq_enabled
);
212 static struct ctl_table kern_table
[];
213 static struct ctl_table vm_table
[];
214 static struct ctl_table fs_table
[];
215 static struct ctl_table debug_table
[];
216 static struct ctl_table dev_table
[];
217 extern struct ctl_table random_table
[];
219 extern struct ctl_table epoll_table
[];
222 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
223 int sysctl_legacy_va_layout
;
226 /* The default sysctl tables: */
228 static struct ctl_table sysctl_base_table
[] = {
230 .procname
= "kernel",
247 .child
= debug_table
,
257 #ifdef CONFIG_SCHED_DEBUG
258 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
259 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
260 static int min_wakeup_granularity_ns
; /* 0 usecs */
261 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
263 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
264 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
265 #endif /* CONFIG_SMP */
266 #endif /* CONFIG_SCHED_DEBUG */
268 #ifdef CONFIG_COMPACTION
269 static int min_extfrag_threshold
;
270 static int max_extfrag_threshold
= 1000;
273 static struct ctl_table kern_table
[] = {
275 .procname
= "sched_child_runs_first",
276 .data
= &sysctl_sched_child_runs_first
,
277 .maxlen
= sizeof(unsigned int),
279 .proc_handler
= proc_dointvec
,
281 #ifdef CONFIG_SCHED_DEBUG
283 .procname
= "sched_min_granularity_ns",
284 .data
= &sysctl_sched_min_granularity
,
285 .maxlen
= sizeof(unsigned int),
287 .proc_handler
= sched_proc_update_handler
,
288 .extra1
= &min_sched_granularity_ns
,
289 .extra2
= &max_sched_granularity_ns
,
292 .procname
= "sched_latency_ns",
293 .data
= &sysctl_sched_latency
,
294 .maxlen
= sizeof(unsigned int),
296 .proc_handler
= sched_proc_update_handler
,
297 .extra1
= &min_sched_granularity_ns
,
298 .extra2
= &max_sched_granularity_ns
,
301 .procname
= "sched_wakeup_granularity_ns",
302 .data
= &sysctl_sched_wakeup_granularity
,
303 .maxlen
= sizeof(unsigned int),
305 .proc_handler
= sched_proc_update_handler
,
306 .extra1
= &min_wakeup_granularity_ns
,
307 .extra2
= &max_wakeup_granularity_ns
,
311 .procname
= "sched_tunable_scaling",
312 .data
= &sysctl_sched_tunable_scaling
,
313 .maxlen
= sizeof(enum sched_tunable_scaling
),
315 .proc_handler
= sched_proc_update_handler
,
316 .extra1
= &min_sched_tunable_scaling
,
317 .extra2
= &max_sched_tunable_scaling
,
320 .procname
= "sched_migration_cost_ns",
321 .data
= &sysctl_sched_migration_cost
,
322 .maxlen
= sizeof(unsigned int),
324 .proc_handler
= proc_dointvec
,
327 .procname
= "sched_nr_migrate",
328 .data
= &sysctl_sched_nr_migrate
,
329 .maxlen
= sizeof(unsigned int),
331 .proc_handler
= proc_dointvec
,
334 .procname
= "sched_time_avg_ms",
335 .data
= &sysctl_sched_time_avg
,
336 .maxlen
= sizeof(unsigned int),
338 .proc_handler
= proc_dointvec
,
341 .procname
= "sched_shares_window_ns",
342 .data
= &sysctl_sched_shares_window
,
343 .maxlen
= sizeof(unsigned int),
345 .proc_handler
= proc_dointvec
,
348 .procname
= "timer_migration",
349 .data
= &sysctl_timer_migration
,
350 .maxlen
= sizeof(unsigned int),
352 .proc_handler
= proc_dointvec_minmax
,
356 #endif /* CONFIG_SMP */
357 #ifdef CONFIG_NUMA_BALANCING
359 .procname
= "numa_balancing_scan_delay_ms",
360 .data
= &sysctl_numa_balancing_scan_delay
,
361 .maxlen
= sizeof(unsigned int),
363 .proc_handler
= proc_dointvec
,
366 .procname
= "numa_balancing_scan_period_min_ms",
367 .data
= &sysctl_numa_balancing_scan_period_min
,
368 .maxlen
= sizeof(unsigned int),
370 .proc_handler
= proc_dointvec
,
373 .procname
= "numa_balancing_scan_period_max_ms",
374 .data
= &sysctl_numa_balancing_scan_period_max
,
375 .maxlen
= sizeof(unsigned int),
377 .proc_handler
= proc_dointvec
,
380 .procname
= "numa_balancing_scan_size_mb",
381 .data
= &sysctl_numa_balancing_scan_size
,
382 .maxlen
= sizeof(unsigned int),
384 .proc_handler
= proc_dointvec
,
387 .procname
= "numa_balancing_migrate_deferred",
388 .data
= &sysctl_numa_balancing_migrate_deferred
,
389 .maxlen
= sizeof(unsigned int),
391 .proc_handler
= proc_dointvec
,
394 .procname
= "numa_balancing",
395 .data
= NULL
, /* filled in by handler */
396 .maxlen
= sizeof(unsigned int),
398 .proc_handler
= sysctl_numa_balancing
,
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
405 .procname
= "sched_rt_period_us",
406 .data
= &sysctl_sched_rt_period
,
407 .maxlen
= sizeof(unsigned int),
409 .proc_handler
= sched_rt_handler
,
412 .procname
= "sched_rt_runtime_us",
413 .data
= &sysctl_sched_rt_runtime
,
414 .maxlen
= sizeof(int),
416 .proc_handler
= sched_rt_handler
,
419 .procname
= "sched_rr_timeslice_ms",
420 .data
= &sched_rr_timeslice
,
421 .maxlen
= sizeof(int),
423 .proc_handler
= sched_rr_handler
,
425 #ifdef CONFIG_SCHED_AUTOGROUP
427 .procname
= "sched_autogroup_enabled",
428 .data
= &sysctl_sched_autogroup_enabled
,
429 .maxlen
= sizeof(unsigned int),
431 .proc_handler
= proc_dointvec_minmax
,
436 #ifdef CONFIG_CFS_BANDWIDTH
438 .procname
= "sched_cfs_bandwidth_slice_us",
439 .data
= &sysctl_sched_cfs_bandwidth_slice
,
440 .maxlen
= sizeof(unsigned int),
442 .proc_handler
= proc_dointvec_minmax
,
446 #ifdef CONFIG_PROVE_LOCKING
448 .procname
= "prove_locking",
449 .data
= &prove_locking
,
450 .maxlen
= sizeof(int),
452 .proc_handler
= proc_dointvec
,
455 #ifdef CONFIG_LOCK_STAT
457 .procname
= "lock_stat",
459 .maxlen
= sizeof(int),
461 .proc_handler
= proc_dointvec
,
466 .data
= &panic_timeout
,
467 .maxlen
= sizeof(int),
469 .proc_handler
= proc_dointvec
,
471 #ifdef CONFIG_COREDUMP
473 .procname
= "core_uses_pid",
474 .data
= &core_uses_pid
,
475 .maxlen
= sizeof(int),
477 .proc_handler
= proc_dointvec
,
480 .procname
= "core_pattern",
481 .data
= core_pattern
,
482 .maxlen
= CORENAME_MAX_SIZE
,
484 .proc_handler
= proc_dostring_coredump
,
487 .procname
= "core_pipe_limit",
488 .data
= &core_pipe_limit
,
489 .maxlen
= sizeof(unsigned int),
491 .proc_handler
= proc_dointvec
,
494 #ifdef CONFIG_PROC_SYSCTL
496 .procname
= "tainted",
497 .maxlen
= sizeof(long),
499 .proc_handler
= proc_taint
,
502 #ifdef CONFIG_LATENCYTOP
504 .procname
= "latencytop",
505 .data
= &latencytop_enabled
,
506 .maxlen
= sizeof(int),
508 .proc_handler
= proc_dointvec
,
511 #ifdef CONFIG_BLK_DEV_INITRD
513 .procname
= "real-root-dev",
514 .data
= &real_root_dev
,
515 .maxlen
= sizeof(int),
517 .proc_handler
= proc_dointvec
,
521 .procname
= "print-fatal-signals",
522 .data
= &print_fatal_signals
,
523 .maxlen
= sizeof(int),
525 .proc_handler
= proc_dointvec
,
529 .procname
= "reboot-cmd",
530 .data
= reboot_command
,
533 .proc_handler
= proc_dostring
,
536 .procname
= "stop-a",
537 .data
= &stop_a_enabled
,
538 .maxlen
= sizeof (int),
540 .proc_handler
= proc_dointvec
,
543 .procname
= "scons-poweroff",
544 .data
= &scons_pwroff
,
545 .maxlen
= sizeof (int),
547 .proc_handler
= proc_dointvec
,
550 #ifdef CONFIG_SPARC64
552 .procname
= "tsb-ratio",
553 .data
= &sysctl_tsb_ratio
,
554 .maxlen
= sizeof (int),
556 .proc_handler
= proc_dointvec
,
561 .procname
= "soft-power",
562 .data
= &pwrsw_enabled
,
563 .maxlen
= sizeof (int),
565 .proc_handler
= proc_dointvec
,
568 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
570 .procname
= "unaligned-trap",
571 .data
= &unaligned_enabled
,
572 .maxlen
= sizeof (int),
574 .proc_handler
= proc_dointvec
,
578 .procname
= "ctrl-alt-del",
580 .maxlen
= sizeof(int),
582 .proc_handler
= proc_dointvec
,
584 #ifdef CONFIG_FUNCTION_TRACER
586 .procname
= "ftrace_enabled",
587 .data
= &ftrace_enabled
,
588 .maxlen
= sizeof(int),
590 .proc_handler
= ftrace_enable_sysctl
,
593 #ifdef CONFIG_STACK_TRACER
595 .procname
= "stack_tracer_enabled",
596 .data
= &stack_tracer_enabled
,
597 .maxlen
= sizeof(int),
599 .proc_handler
= stack_trace_sysctl
,
602 #ifdef CONFIG_TRACING
604 .procname
= "ftrace_dump_on_oops",
605 .data
= &ftrace_dump_on_oops
,
606 .maxlen
= sizeof(int),
608 .proc_handler
= proc_dointvec
,
611 .procname
= "traceoff_on_warning",
612 .data
= &__disable_trace_on_warning
,
613 .maxlen
= sizeof(__disable_trace_on_warning
),
615 .proc_handler
= proc_dointvec
,
620 .procname
= "kexec_load_disabled",
621 .data
= &kexec_load_disabled
,
622 .maxlen
= sizeof(int),
624 /* only handle a transition from default "0" to "1" */
625 .proc_handler
= proc_dointvec_minmax
,
630 #ifdef CONFIG_MODULES
632 .procname
= "modprobe",
633 .data
= &modprobe_path
,
634 .maxlen
= KMOD_PATH_LEN
,
636 .proc_handler
= proc_dostring
,
639 .procname
= "modules_disabled",
640 .data
= &modules_disabled
,
641 .maxlen
= sizeof(int),
643 /* only handle a transition from default "0" to "1" */
644 .proc_handler
= proc_dointvec_minmax
,
651 .procname
= "hotplug",
652 .data
= &uevent_helper
,
653 .maxlen
= UEVENT_HELPER_PATH_LEN
,
655 .proc_handler
= proc_dostring
,
658 #ifdef CONFIG_CHR_DEV_SG
660 .procname
= "sg-big-buff",
661 .data
= &sg_big_buff
,
662 .maxlen
= sizeof (int),
664 .proc_handler
= proc_dointvec
,
667 #ifdef CONFIG_BSD_PROCESS_ACCT
671 .maxlen
= 3*sizeof(int),
673 .proc_handler
= proc_dointvec
,
676 #ifdef CONFIG_MAGIC_SYSRQ
679 .data
= &__sysrq_enabled
,
680 .maxlen
= sizeof (int),
682 .proc_handler
= sysrq_sysctl_handler
,
685 #ifdef CONFIG_PROC_SYSCTL
687 .procname
= "cad_pid",
689 .maxlen
= sizeof (int),
691 .proc_handler
= proc_do_cad_pid
,
695 .procname
= "threads-max",
696 .data
= &max_threads
,
697 .maxlen
= sizeof(int),
699 .proc_handler
= proc_dointvec
,
702 .procname
= "random",
704 .child
= random_table
,
707 .procname
= "usermodehelper",
709 .child
= usermodehelper_table
,
712 .procname
= "overflowuid",
713 .data
= &overflowuid
,
714 .maxlen
= sizeof(int),
716 .proc_handler
= proc_dointvec_minmax
,
717 .extra1
= &minolduid
,
718 .extra2
= &maxolduid
,
721 .procname
= "overflowgid",
722 .data
= &overflowgid
,
723 .maxlen
= sizeof(int),
725 .proc_handler
= proc_dointvec_minmax
,
726 .extra1
= &minolduid
,
727 .extra2
= &maxolduid
,
730 #ifdef CONFIG_MATHEMU
732 .procname
= "ieee_emulation_warnings",
733 .data
= &sysctl_ieee_emulation_warnings
,
734 .maxlen
= sizeof(int),
736 .proc_handler
= proc_dointvec
,
740 .procname
= "userprocess_debug",
741 .data
= &show_unhandled_signals
,
742 .maxlen
= sizeof(int),
744 .proc_handler
= proc_dointvec
,
748 .procname
= "pid_max",
750 .maxlen
= sizeof (int),
752 .proc_handler
= proc_dointvec_minmax
,
753 .extra1
= &pid_max_min
,
754 .extra2
= &pid_max_max
,
757 .procname
= "panic_on_oops",
758 .data
= &panic_on_oops
,
759 .maxlen
= sizeof(int),
761 .proc_handler
= proc_dointvec
,
763 #if defined CONFIG_PRINTK
765 .procname
= "printk",
766 .data
= &console_loglevel
,
767 .maxlen
= 4*sizeof(int),
769 .proc_handler
= proc_dointvec
,
772 .procname
= "printk_ratelimit",
773 .data
= &printk_ratelimit_state
.interval
,
774 .maxlen
= sizeof(int),
776 .proc_handler
= proc_dointvec_jiffies
,
779 .procname
= "printk_ratelimit_burst",
780 .data
= &printk_ratelimit_state
.burst
,
781 .maxlen
= sizeof(int),
783 .proc_handler
= proc_dointvec
,
786 .procname
= "printk_delay",
787 .data
= &printk_delay_msec
,
788 .maxlen
= sizeof(int),
790 .proc_handler
= proc_dointvec_minmax
,
792 .extra2
= &ten_thousand
,
795 .procname
= "dmesg_restrict",
796 .data
= &dmesg_restrict
,
797 .maxlen
= sizeof(int),
799 .proc_handler
= proc_dointvec_minmax_sysadmin
,
804 .procname
= "kptr_restrict",
805 .data
= &kptr_restrict
,
806 .maxlen
= sizeof(int),
808 .proc_handler
= proc_dointvec_minmax_sysadmin
,
814 .procname
= "ngroups_max",
815 .data
= &ngroups_max
,
816 .maxlen
= sizeof (int),
818 .proc_handler
= proc_dointvec
,
821 .procname
= "cap_last_cap",
822 .data
= (void *)&cap_last_cap
,
823 .maxlen
= sizeof(int),
825 .proc_handler
= proc_dointvec
,
827 #if defined(CONFIG_LOCKUP_DETECTOR)
829 .procname
= "watchdog",
830 .data
= &watchdog_user_enabled
,
831 .maxlen
= sizeof (int),
833 .proc_handler
= proc_dowatchdog
,
838 .procname
= "watchdog_thresh",
839 .data
= &watchdog_thresh
,
840 .maxlen
= sizeof(int),
842 .proc_handler
= proc_dowatchdog
,
847 .procname
= "softlockup_panic",
848 .data
= &softlockup_panic
,
849 .maxlen
= sizeof(int),
851 .proc_handler
= proc_dointvec_minmax
,
856 .procname
= "nmi_watchdog",
857 .data
= &watchdog_user_enabled
,
858 .maxlen
= sizeof (int),
860 .proc_handler
= proc_dowatchdog
,
865 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
867 .procname
= "unknown_nmi_panic",
868 .data
= &unknown_nmi_panic
,
869 .maxlen
= sizeof (int),
871 .proc_handler
= proc_dointvec
,
874 #if defined(CONFIG_X86)
876 .procname
= "panic_on_unrecovered_nmi",
877 .data
= &panic_on_unrecovered_nmi
,
878 .maxlen
= sizeof(int),
880 .proc_handler
= proc_dointvec
,
883 .procname
= "panic_on_io_nmi",
884 .data
= &panic_on_io_nmi
,
885 .maxlen
= sizeof(int),
887 .proc_handler
= proc_dointvec
,
889 #ifdef CONFIG_DEBUG_STACKOVERFLOW
891 .procname
= "panic_on_stackoverflow",
892 .data
= &sysctl_panic_on_stackoverflow
,
893 .maxlen
= sizeof(int),
895 .proc_handler
= proc_dointvec
,
899 .procname
= "bootloader_type",
900 .data
= &bootloader_type
,
901 .maxlen
= sizeof (int),
903 .proc_handler
= proc_dointvec
,
906 .procname
= "bootloader_version",
907 .data
= &bootloader_version
,
908 .maxlen
= sizeof (int),
910 .proc_handler
= proc_dointvec
,
913 .procname
= "kstack_depth_to_print",
914 .data
= &kstack_depth_to_print
,
915 .maxlen
= sizeof(int),
917 .proc_handler
= proc_dointvec
,
920 .procname
= "io_delay_type",
921 .data
= &io_delay_type
,
922 .maxlen
= sizeof(int),
924 .proc_handler
= proc_dointvec
,
927 #if defined(CONFIG_MMU)
929 .procname
= "randomize_va_space",
930 .data
= &randomize_va_space
,
931 .maxlen
= sizeof(int),
933 .proc_handler
= proc_dointvec
,
936 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
938 .procname
= "spin_retry",
940 .maxlen
= sizeof (int),
942 .proc_handler
= proc_dointvec
,
945 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
947 .procname
= "acpi_video_flags",
948 .data
= &acpi_realmode_flags
,
949 .maxlen
= sizeof (unsigned long),
951 .proc_handler
= proc_doulongvec_minmax
,
954 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
956 .procname
= "ignore-unaligned-usertrap",
957 .data
= &no_unaligned_warning
,
958 .maxlen
= sizeof (int),
960 .proc_handler
= proc_dointvec
,
965 .procname
= "unaligned-dump-stack",
966 .data
= &unaligned_dump_stack
,
967 .maxlen
= sizeof (int),
969 .proc_handler
= proc_dointvec
,
972 #ifdef CONFIG_DETECT_HUNG_TASK
974 .procname
= "hung_task_panic",
975 .data
= &sysctl_hung_task_panic
,
976 .maxlen
= sizeof(int),
978 .proc_handler
= proc_dointvec_minmax
,
983 .procname
= "hung_task_check_count",
984 .data
= &sysctl_hung_task_check_count
,
985 .maxlen
= sizeof(int),
987 .proc_handler
= proc_dointvec_minmax
,
991 .procname
= "hung_task_timeout_secs",
992 .data
= &sysctl_hung_task_timeout_secs
,
993 .maxlen
= sizeof(unsigned long),
995 .proc_handler
= proc_dohung_task_timeout_secs
,
998 .procname
= "hung_task_warnings",
999 .data
= &sysctl_hung_task_warnings
,
1000 .maxlen
= sizeof(unsigned long),
1002 .proc_handler
= proc_doulongvec_minmax
,
1005 #ifdef CONFIG_COMPAT
1007 .procname
= "compat-log",
1008 .data
= &compat_log
,
1009 .maxlen
= sizeof (int),
1011 .proc_handler
= proc_dointvec
,
1014 #ifdef CONFIG_RT_MUTEXES
1016 .procname
= "max_lock_depth",
1017 .data
= &max_lock_depth
,
1018 .maxlen
= sizeof(int),
1020 .proc_handler
= proc_dointvec
,
1024 .procname
= "poweroff_cmd",
1025 .data
= &poweroff_cmd
,
1026 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1028 .proc_handler
= proc_dostring
,
1034 .child
= key_sysctls
,
1037 #ifdef CONFIG_RCU_TORTURE_TEST
1039 .procname
= "rcutorture_runnable",
1040 .data
= &rcutorture_runnable
,
1041 .maxlen
= sizeof(int),
1043 .proc_handler
= proc_dointvec
,
1046 #ifdef CONFIG_PERF_EVENTS
1048 * User-space scripts rely on the existence of this file
1049 * as a feature check for perf_events being enabled.
1051 * So it's an ABI, do not remove!
1054 .procname
= "perf_event_paranoid",
1055 .data
= &sysctl_perf_event_paranoid
,
1056 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1058 .proc_handler
= proc_dointvec
,
1061 .procname
= "perf_event_mlock_kb",
1062 .data
= &sysctl_perf_event_mlock
,
1063 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1065 .proc_handler
= proc_dointvec
,
1068 .procname
= "perf_event_max_sample_rate",
1069 .data
= &sysctl_perf_event_sample_rate
,
1070 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1072 .proc_handler
= perf_proc_update_handler
,
1076 .procname
= "perf_cpu_time_max_percent",
1077 .data
= &sysctl_perf_cpu_time_max_percent
,
1078 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1080 .proc_handler
= perf_cpu_time_max_percent_handler
,
1082 .extra2
= &one_hundred
,
1085 #ifdef CONFIG_KMEMCHECK
1087 .procname
= "kmemcheck",
1088 .data
= &kmemcheck_enabled
,
1089 .maxlen
= sizeof(int),
1091 .proc_handler
= proc_dointvec
,
1096 .procname
= "blk_iopoll",
1097 .data
= &blk_iopoll_enabled
,
1098 .maxlen
= sizeof(int),
1100 .proc_handler
= proc_dointvec
,
1106 static struct ctl_table vm_table
[] = {
1108 .procname
= "overcommit_memory",
1109 .data
= &sysctl_overcommit_memory
,
1110 .maxlen
= sizeof(sysctl_overcommit_memory
),
1112 .proc_handler
= proc_dointvec_minmax
,
1117 .procname
= "panic_on_oom",
1118 .data
= &sysctl_panic_on_oom
,
1119 .maxlen
= sizeof(sysctl_panic_on_oom
),
1121 .proc_handler
= proc_dointvec_minmax
,
1126 .procname
= "oom_kill_allocating_task",
1127 .data
= &sysctl_oom_kill_allocating_task
,
1128 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1130 .proc_handler
= proc_dointvec
,
1133 .procname
= "oom_dump_tasks",
1134 .data
= &sysctl_oom_dump_tasks
,
1135 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1137 .proc_handler
= proc_dointvec
,
1140 .procname
= "overcommit_ratio",
1141 .data
= &sysctl_overcommit_ratio
,
1142 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1144 .proc_handler
= overcommit_ratio_handler
,
1147 .procname
= "overcommit_kbytes",
1148 .data
= &sysctl_overcommit_kbytes
,
1149 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1151 .proc_handler
= overcommit_kbytes_handler
,
1154 .procname
= "page-cluster",
1155 .data
= &page_cluster
,
1156 .maxlen
= sizeof(int),
1158 .proc_handler
= proc_dointvec_minmax
,
1162 .procname
= "dirty_background_ratio",
1163 .data
= &dirty_background_ratio
,
1164 .maxlen
= sizeof(dirty_background_ratio
),
1166 .proc_handler
= dirty_background_ratio_handler
,
1168 .extra2
= &one_hundred
,
1171 .procname
= "dirty_background_bytes",
1172 .data
= &dirty_background_bytes
,
1173 .maxlen
= sizeof(dirty_background_bytes
),
1175 .proc_handler
= dirty_background_bytes_handler
,
1179 .procname
= "dirty_ratio",
1180 .data
= &vm_dirty_ratio
,
1181 .maxlen
= sizeof(vm_dirty_ratio
),
1183 .proc_handler
= dirty_ratio_handler
,
1185 .extra2
= &one_hundred
,
1188 .procname
= "dirty_bytes",
1189 .data
= &vm_dirty_bytes
,
1190 .maxlen
= sizeof(vm_dirty_bytes
),
1192 .proc_handler
= dirty_bytes_handler
,
1193 .extra1
= &dirty_bytes_min
,
1196 .procname
= "dirty_writeback_centisecs",
1197 .data
= &dirty_writeback_interval
,
1198 .maxlen
= sizeof(dirty_writeback_interval
),
1200 .proc_handler
= dirty_writeback_centisecs_handler
,
1203 .procname
= "dirty_expire_centisecs",
1204 .data
= &dirty_expire_interval
,
1205 .maxlen
= sizeof(dirty_expire_interval
),
1207 .proc_handler
= proc_dointvec_minmax
,
1211 .procname
= "nr_pdflush_threads",
1212 .mode
= 0444 /* read-only */,
1213 .proc_handler
= pdflush_proc_obsolete
,
1216 .procname
= "swappiness",
1217 .data
= &vm_swappiness
,
1218 .maxlen
= sizeof(vm_swappiness
),
1220 .proc_handler
= proc_dointvec_minmax
,
1222 .extra2
= &one_hundred
,
1224 #ifdef CONFIG_HUGETLB_PAGE
1226 .procname
= "nr_hugepages",
1228 .maxlen
= sizeof(unsigned long),
1230 .proc_handler
= hugetlb_sysctl_handler
,
1231 .extra1
= (void *)&hugetlb_zero
,
1232 .extra2
= (void *)&hugetlb_infinity
,
1236 .procname
= "nr_hugepages_mempolicy",
1238 .maxlen
= sizeof(unsigned long),
1240 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1241 .extra1
= (void *)&hugetlb_zero
,
1242 .extra2
= (void *)&hugetlb_infinity
,
1246 .procname
= "hugetlb_shm_group",
1247 .data
= &sysctl_hugetlb_shm_group
,
1248 .maxlen
= sizeof(gid_t
),
1250 .proc_handler
= proc_dointvec
,
1253 .procname
= "hugepages_treat_as_movable",
1254 .data
= &hugepages_treat_as_movable
,
1255 .maxlen
= sizeof(int),
1257 .proc_handler
= proc_dointvec
,
1260 .procname
= "nr_overcommit_hugepages",
1262 .maxlen
= sizeof(unsigned long),
1264 .proc_handler
= hugetlb_overcommit_handler
,
1265 .extra1
= (void *)&hugetlb_zero
,
1266 .extra2
= (void *)&hugetlb_infinity
,
1270 .procname
= "lowmem_reserve_ratio",
1271 .data
= &sysctl_lowmem_reserve_ratio
,
1272 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1274 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1277 .procname
= "drop_caches",
1278 .data
= &sysctl_drop_caches
,
1279 .maxlen
= sizeof(int),
1281 .proc_handler
= drop_caches_sysctl_handler
,
1285 #ifdef CONFIG_COMPACTION
1287 .procname
= "compact_memory",
1288 .data
= &sysctl_compact_memory
,
1289 .maxlen
= sizeof(int),
1291 .proc_handler
= sysctl_compaction_handler
,
1294 .procname
= "extfrag_threshold",
1295 .data
= &sysctl_extfrag_threshold
,
1296 .maxlen
= sizeof(int),
1298 .proc_handler
= sysctl_extfrag_handler
,
1299 .extra1
= &min_extfrag_threshold
,
1300 .extra2
= &max_extfrag_threshold
,
1303 #endif /* CONFIG_COMPACTION */
1305 .procname
= "min_free_kbytes",
1306 .data
= &min_free_kbytes
,
1307 .maxlen
= sizeof(min_free_kbytes
),
1309 .proc_handler
= min_free_kbytes_sysctl_handler
,
1313 .procname
= "percpu_pagelist_fraction",
1314 .data
= &percpu_pagelist_fraction
,
1315 .maxlen
= sizeof(percpu_pagelist_fraction
),
1317 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1318 .extra1
= &min_percpu_pagelist_fract
,
1322 .procname
= "max_map_count",
1323 .data
= &sysctl_max_map_count
,
1324 .maxlen
= sizeof(sysctl_max_map_count
),
1326 .proc_handler
= proc_dointvec_minmax
,
1331 .procname
= "nr_trim_pages",
1332 .data
= &sysctl_nr_trim_pages
,
1333 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1335 .proc_handler
= proc_dointvec_minmax
,
1340 .procname
= "laptop_mode",
1341 .data
= &laptop_mode
,
1342 .maxlen
= sizeof(laptop_mode
),
1344 .proc_handler
= proc_dointvec_jiffies
,
1347 .procname
= "block_dump",
1348 .data
= &block_dump
,
1349 .maxlen
= sizeof(block_dump
),
1351 .proc_handler
= proc_dointvec
,
1355 .procname
= "vfs_cache_pressure",
1356 .data
= &sysctl_vfs_cache_pressure
,
1357 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1359 .proc_handler
= proc_dointvec
,
1362 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1364 .procname
= "legacy_va_layout",
1365 .data
= &sysctl_legacy_va_layout
,
1366 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1368 .proc_handler
= proc_dointvec
,
1374 .procname
= "zone_reclaim_mode",
1375 .data
= &zone_reclaim_mode
,
1376 .maxlen
= sizeof(zone_reclaim_mode
),
1378 .proc_handler
= proc_dointvec
,
1382 .procname
= "min_unmapped_ratio",
1383 .data
= &sysctl_min_unmapped_ratio
,
1384 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1386 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1388 .extra2
= &one_hundred
,
1391 .procname
= "min_slab_ratio",
1392 .data
= &sysctl_min_slab_ratio
,
1393 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1395 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1397 .extra2
= &one_hundred
,
1402 .procname
= "stat_interval",
1403 .data
= &sysctl_stat_interval
,
1404 .maxlen
= sizeof(sysctl_stat_interval
),
1406 .proc_handler
= proc_dointvec_jiffies
,
1411 .procname
= "mmap_min_addr",
1412 .data
= &dac_mmap_min_addr
,
1413 .maxlen
= sizeof(unsigned long),
1415 .proc_handler
= mmap_min_addr_handler
,
1420 .procname
= "numa_zonelist_order",
1421 .data
= &numa_zonelist_order
,
1422 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1424 .proc_handler
= numa_zonelist_order_handler
,
1427 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1428 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1430 .procname
= "vdso_enabled",
1431 .data
= &vdso_enabled
,
1432 .maxlen
= sizeof(vdso_enabled
),
1434 .proc_handler
= proc_dointvec
,
1438 #ifdef CONFIG_HIGHMEM
1440 .procname
= "highmem_is_dirtyable",
1441 .data
= &vm_highmem_is_dirtyable
,
1442 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1444 .proc_handler
= proc_dointvec_minmax
,
1450 .procname
= "scan_unevictable_pages",
1451 .data
= &scan_unevictable_pages
,
1452 .maxlen
= sizeof(scan_unevictable_pages
),
1454 .proc_handler
= scan_unevictable_handler
,
1456 #ifdef CONFIG_MEMORY_FAILURE
1458 .procname
= "memory_failure_early_kill",
1459 .data
= &sysctl_memory_failure_early_kill
,
1460 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1462 .proc_handler
= proc_dointvec_minmax
,
1467 .procname
= "memory_failure_recovery",
1468 .data
= &sysctl_memory_failure_recovery
,
1469 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1471 .proc_handler
= proc_dointvec_minmax
,
1477 .procname
= "user_reserve_kbytes",
1478 .data
= &sysctl_user_reserve_kbytes
,
1479 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1481 .proc_handler
= proc_doulongvec_minmax
,
1484 .procname
= "admin_reserve_kbytes",
1485 .data
= &sysctl_admin_reserve_kbytes
,
1486 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1488 .proc_handler
= proc_doulongvec_minmax
,
1493 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1494 static struct ctl_table binfmt_misc_table
[] = {
1499 static struct ctl_table fs_table
[] = {
1501 .procname
= "inode-nr",
1502 .data
= &inodes_stat
,
1503 .maxlen
= 2*sizeof(long),
1505 .proc_handler
= proc_nr_inodes
,
1508 .procname
= "inode-state",
1509 .data
= &inodes_stat
,
1510 .maxlen
= 7*sizeof(long),
1512 .proc_handler
= proc_nr_inodes
,
1515 .procname
= "file-nr",
1516 .data
= &files_stat
,
1517 .maxlen
= sizeof(files_stat
),
1519 .proc_handler
= proc_nr_files
,
1522 .procname
= "file-max",
1523 .data
= &files_stat
.max_files
,
1524 .maxlen
= sizeof(files_stat
.max_files
),
1526 .proc_handler
= proc_doulongvec_minmax
,
1529 .procname
= "nr_open",
1530 .data
= &sysctl_nr_open
,
1531 .maxlen
= sizeof(int),
1533 .proc_handler
= proc_dointvec_minmax
,
1534 .extra1
= &sysctl_nr_open_min
,
1535 .extra2
= &sysctl_nr_open_max
,
1538 .procname
= "dentry-state",
1539 .data
= &dentry_stat
,
1540 .maxlen
= 6*sizeof(long),
1542 .proc_handler
= proc_nr_dentry
,
1545 .procname
= "overflowuid",
1546 .data
= &fs_overflowuid
,
1547 .maxlen
= sizeof(int),
1549 .proc_handler
= proc_dointvec_minmax
,
1550 .extra1
= &minolduid
,
1551 .extra2
= &maxolduid
,
1554 .procname
= "overflowgid",
1555 .data
= &fs_overflowgid
,
1556 .maxlen
= sizeof(int),
1558 .proc_handler
= proc_dointvec_minmax
,
1559 .extra1
= &minolduid
,
1560 .extra2
= &maxolduid
,
1562 #ifdef CONFIG_FILE_LOCKING
1564 .procname
= "leases-enable",
1565 .data
= &leases_enable
,
1566 .maxlen
= sizeof(int),
1568 .proc_handler
= proc_dointvec
,
1571 #ifdef CONFIG_DNOTIFY
1573 .procname
= "dir-notify-enable",
1574 .data
= &dir_notify_enable
,
1575 .maxlen
= sizeof(int),
1577 .proc_handler
= proc_dointvec
,
1581 #ifdef CONFIG_FILE_LOCKING
1583 .procname
= "lease-break-time",
1584 .data
= &lease_break_time
,
1585 .maxlen
= sizeof(int),
1587 .proc_handler
= proc_dointvec
,
1592 .procname
= "aio-nr",
1594 .maxlen
= sizeof(aio_nr
),
1596 .proc_handler
= proc_doulongvec_minmax
,
1599 .procname
= "aio-max-nr",
1600 .data
= &aio_max_nr
,
1601 .maxlen
= sizeof(aio_max_nr
),
1603 .proc_handler
= proc_doulongvec_minmax
,
1605 #endif /* CONFIG_AIO */
1606 #ifdef CONFIG_INOTIFY_USER
1608 .procname
= "inotify",
1610 .child
= inotify_table
,
1615 .procname
= "epoll",
1617 .child
= epoll_table
,
1622 .procname
= "protected_symlinks",
1623 .data
= &sysctl_protected_symlinks
,
1624 .maxlen
= sizeof(int),
1626 .proc_handler
= proc_dointvec_minmax
,
1631 .procname
= "protected_hardlinks",
1632 .data
= &sysctl_protected_hardlinks
,
1633 .maxlen
= sizeof(int),
1635 .proc_handler
= proc_dointvec_minmax
,
1640 .procname
= "suid_dumpable",
1641 .data
= &suid_dumpable
,
1642 .maxlen
= sizeof(int),
1644 .proc_handler
= proc_dointvec_minmax_coredump
,
1648 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1650 .procname
= "binfmt_misc",
1652 .child
= binfmt_misc_table
,
1656 .procname
= "pipe-max-size",
1657 .data
= &pipe_max_size
,
1658 .maxlen
= sizeof(int),
1660 .proc_handler
= &pipe_proc_fn
,
1661 .extra1
= &pipe_min_size
,
1666 static struct ctl_table debug_table
[] = {
1667 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1669 .procname
= "exception-trace",
1670 .data
= &show_unhandled_signals
,
1671 .maxlen
= sizeof(int),
1673 .proc_handler
= proc_dointvec
1676 #if defined(CONFIG_OPTPROBES)
1678 .procname
= "kprobes-optimization",
1679 .data
= &sysctl_kprobes_optimization
,
1680 .maxlen
= sizeof(int),
1682 .proc_handler
= proc_kprobes_optimization_handler
,
1690 static struct ctl_table dev_table
[] = {
1694 int __init
sysctl_init(void)
1696 struct ctl_table_header
*hdr
;
1698 hdr
= register_sysctl_table(sysctl_base_table
);
1699 kmemleak_not_leak(hdr
);
1703 #endif /* CONFIG_SYSCTL */
1709 #ifdef CONFIG_PROC_SYSCTL
1711 static int _proc_do_string(void* data
, int maxlen
, int write
,
1712 void __user
*buffer
,
1713 size_t *lenp
, loff_t
*ppos
)
1719 if (!data
|| !maxlen
|| !*lenp
) {
1727 while (len
< *lenp
) {
1728 if (get_user(c
, p
++))
1730 if (c
== 0 || c
== '\n')
1736 if(copy_from_user(data
, buffer
, len
))
1738 ((char *) data
)[len
] = 0;
1756 if(copy_to_user(buffer
, data
, len
))
1759 if(put_user('\n', ((char __user
*) buffer
) + len
))
1770 * proc_dostring - read a string sysctl
1771 * @table: the sysctl table
1772 * @write: %TRUE if this is a write to the sysctl file
1773 * @buffer: the user buffer
1774 * @lenp: the size of the user buffer
1775 * @ppos: file position
1777 * Reads/writes a string from/to the user buffer. If the kernel
1778 * buffer provided is not large enough to hold the string, the
1779 * string is truncated. The copied string is %NULL-terminated.
1780 * If the string is being read by the user process, it is copied
1781 * and a newline '\n' is added. It is truncated if the buffer is
1784 * Returns 0 on success.
1786 int proc_dostring(struct ctl_table
*table
, int write
,
1787 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1789 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1790 buffer
, lenp
, ppos
);
1793 static size_t proc_skip_spaces(char **buf
)
1796 char *tmp
= skip_spaces(*buf
);
1802 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1812 #define TMPBUFLEN 22
1814 * proc_get_long - reads an ASCII formatted integer from a user buffer
1816 * @buf: a kernel buffer
1817 * @size: size of the kernel buffer
1818 * @val: this is where the number will be stored
1819 * @neg: set to %TRUE if number is negative
1820 * @perm_tr: a vector which contains the allowed trailers
1821 * @perm_tr_len: size of the perm_tr vector
1822 * @tr: pointer to store the trailer character
1824 * In case of success %0 is returned and @buf and @size are updated with
1825 * the amount of bytes read. If @tr is non-NULL and a trailing
1826 * character exists (size is non-zero after returning from this
1827 * function), @tr is updated with the trailing character.
1829 static int proc_get_long(char **buf
, size_t *size
,
1830 unsigned long *val
, bool *neg
,
1831 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1834 char *p
, tmp
[TMPBUFLEN
];
1840 if (len
> TMPBUFLEN
- 1)
1841 len
= TMPBUFLEN
- 1;
1843 memcpy(tmp
, *buf
, len
);
1847 if (*p
== '-' && *size
> 1) {
1855 *val
= simple_strtoul(p
, &p
, 0);
1859 /* We don't know if the next char is whitespace thus we may accept
1860 * invalid integers (e.g. 1234...a) or two integers instead of one
1861 * (e.g. 123...1). So lets not allow such large numbers. */
1862 if (len
== TMPBUFLEN
- 1)
1865 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1868 if (tr
&& (len
< *size
))
1878 * proc_put_long - converts an integer to a decimal ASCII formatted string
1880 * @buf: the user buffer
1881 * @size: the size of the user buffer
1882 * @val: the integer to be converted
1883 * @neg: sign of the number, %TRUE for negative
1885 * In case of success %0 is returned and @buf and @size are updated with
1886 * the amount of bytes written.
1888 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1892 char tmp
[TMPBUFLEN
], *p
= tmp
;
1894 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1898 if (copy_to_user(*buf
, tmp
, len
))
1906 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1909 char __user
**buffer
= (char __user
**)buf
;
1910 if (put_user(c
, *buffer
))
1912 (*size
)--, (*buffer
)++;
1918 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1920 int write
, void *data
)
1923 *valp
= *negp
? -*lvalp
: *lvalp
;
1928 *lvalp
= (unsigned long)-val
;
1931 *lvalp
= (unsigned long)val
;
1937 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1939 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1940 int write
, void __user
*buffer
,
1941 size_t *lenp
, loff_t
*ppos
,
1942 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1943 int write
, void *data
),
1946 int *i
, vleft
, first
= 1, err
= 0;
1947 unsigned long page
= 0;
1951 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1956 i
= (int *) tbl_data
;
1957 vleft
= table
->maxlen
/ sizeof(*i
);
1961 conv
= do_proc_dointvec_conv
;
1964 if (left
> PAGE_SIZE
- 1)
1965 left
= PAGE_SIZE
- 1;
1966 page
= __get_free_page(GFP_TEMPORARY
);
1967 kbuf
= (char *) page
;
1970 if (copy_from_user(kbuf
, buffer
, left
)) {
1977 for (; left
&& vleft
--; i
++, first
=0) {
1982 left
-= proc_skip_spaces(&kbuf
);
1986 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1988 sizeof(proc_wspace_sep
), NULL
);
1991 if (conv(&neg
, &lval
, i
, 1, data
)) {
1996 if (conv(&neg
, &lval
, i
, 0, data
)) {
2001 err
= proc_put_char(&buffer
, &left
, '\t');
2004 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2010 if (!write
&& !first
&& left
&& !err
)
2011 err
= proc_put_char(&buffer
, &left
, '\n');
2012 if (write
&& !err
&& left
)
2013 left
-= proc_skip_spaces(&kbuf
);
2018 return err
? : -EINVAL
;
2025 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2026 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2027 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2028 int write
, void *data
),
2031 return __do_proc_dointvec(table
->data
, table
, write
,
2032 buffer
, lenp
, ppos
, conv
, data
);
2036 * proc_dointvec - read a vector of integers
2037 * @table: the sysctl table
2038 * @write: %TRUE if this is a write to the sysctl file
2039 * @buffer: the user buffer
2040 * @lenp: the size of the user buffer
2041 * @ppos: file position
2043 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2044 * values from/to the user buffer, treated as an ASCII string.
2046 * Returns 0 on success.
2048 int proc_dointvec(struct ctl_table
*table
, int write
,
2049 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2051 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2056 * Taint values can only be increased
2057 * This means we can safely use a temporary.
2059 static int proc_taint(struct ctl_table
*table
, int write
,
2060 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2063 unsigned long tmptaint
= get_taint();
2066 if (write
&& !capable(CAP_SYS_ADMIN
))
2071 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2077 * Poor man's atomic or. Not worth adding a primitive
2078 * to everyone's atomic.h for this
2081 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2082 if ((tmptaint
>> i
) & 1)
2083 add_taint(i
, LOCKDEP_STILL_OK
);
2090 #ifdef CONFIG_PRINTK
2091 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2092 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2094 if (write
&& !capable(CAP_SYS_ADMIN
))
2097 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2101 struct do_proc_dointvec_minmax_conv_param
{
2106 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2108 int write
, void *data
)
2110 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2112 int val
= *negp
? -*lvalp
: *lvalp
;
2113 if ((param
->min
&& *param
->min
> val
) ||
2114 (param
->max
&& *param
->max
< val
))
2121 *lvalp
= (unsigned long)-val
;
2124 *lvalp
= (unsigned long)val
;
2131 * proc_dointvec_minmax - read a vector of integers with min/max values
2132 * @table: the sysctl table
2133 * @write: %TRUE if this is a write to the sysctl file
2134 * @buffer: the user buffer
2135 * @lenp: the size of the user buffer
2136 * @ppos: file position
2138 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2139 * values from/to the user buffer, treated as an ASCII string.
2141 * This routine will ensure the values are within the range specified by
2142 * table->extra1 (min) and table->extra2 (max).
2144 * Returns 0 on success.
2146 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2149 struct do_proc_dointvec_minmax_conv_param param
= {
2150 .min
= (int *) table
->extra1
,
2151 .max
= (int *) table
->extra2
,
2153 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2154 do_proc_dointvec_minmax_conv
, ¶m
);
2157 static void validate_coredump_safety(void)
2159 #ifdef CONFIG_COREDUMP
2160 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2161 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2162 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2163 "suid_dumpable=2. Pipe handler or fully qualified "\
2164 "core dump path required.\n");
2169 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2170 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2172 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2174 validate_coredump_safety();
2178 #ifdef CONFIG_COREDUMP
2179 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2180 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2182 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2184 validate_coredump_safety();
2189 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2190 void __user
*buffer
,
2191 size_t *lenp
, loff_t
*ppos
,
2192 unsigned long convmul
,
2193 unsigned long convdiv
)
2195 unsigned long *i
, *min
, *max
;
2196 int vleft
, first
= 1, err
= 0;
2197 unsigned long page
= 0;
2201 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2206 i
= (unsigned long *) data
;
2207 min
= (unsigned long *) table
->extra1
;
2208 max
= (unsigned long *) table
->extra2
;
2209 vleft
= table
->maxlen
/ sizeof(unsigned long);
2213 if (left
> PAGE_SIZE
- 1)
2214 left
= PAGE_SIZE
- 1;
2215 page
= __get_free_page(GFP_TEMPORARY
);
2216 kbuf
= (char *) page
;
2219 if (copy_from_user(kbuf
, buffer
, left
)) {
2226 for (; left
&& vleft
--; i
++, first
= 0) {
2232 left
-= proc_skip_spaces(&kbuf
);
2234 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2236 sizeof(proc_wspace_sep
), NULL
);
2241 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2245 val
= convdiv
* (*i
) / convmul
;
2247 err
= proc_put_char(&buffer
, &left
, '\t');
2251 err
= proc_put_long(&buffer
, &left
, val
, false);
2257 if (!write
&& !first
&& left
&& !err
)
2258 err
= proc_put_char(&buffer
, &left
, '\n');
2260 left
-= proc_skip_spaces(&kbuf
);
2265 return err
? : -EINVAL
;
2272 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2273 void __user
*buffer
,
2274 size_t *lenp
, loff_t
*ppos
,
2275 unsigned long convmul
,
2276 unsigned long convdiv
)
2278 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2279 buffer
, lenp
, ppos
, convmul
, convdiv
);
2283 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2284 * @table: the sysctl table
2285 * @write: %TRUE if this is a write to the sysctl file
2286 * @buffer: the user buffer
2287 * @lenp: the size of the user buffer
2288 * @ppos: file position
2290 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2291 * values from/to the user buffer, treated as an ASCII string.
2293 * This routine will ensure the values are within the range specified by
2294 * table->extra1 (min) and table->extra2 (max).
2296 * Returns 0 on success.
2298 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2299 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2301 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2305 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2306 * @table: the sysctl table
2307 * @write: %TRUE if this is a write to the sysctl file
2308 * @buffer: the user buffer
2309 * @lenp: the size of the user buffer
2310 * @ppos: file position
2312 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2313 * values from/to the user buffer, treated as an ASCII string. The values
2314 * are treated as milliseconds, and converted to jiffies when they are stored.
2316 * This routine will ensure the values are within the range specified by
2317 * table->extra1 (min) and table->extra2 (max).
2319 * Returns 0 on success.
2321 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2322 void __user
*buffer
,
2323 size_t *lenp
, loff_t
*ppos
)
2325 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2326 lenp
, ppos
, HZ
, 1000l);
2330 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2332 int write
, void *data
)
2335 if (*lvalp
> LONG_MAX
/ HZ
)
2337 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2343 lval
= (unsigned long)-val
;
2346 lval
= (unsigned long)val
;
2353 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2355 int write
, void *data
)
2358 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2360 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2366 lval
= (unsigned long)-val
;
2369 lval
= (unsigned long)val
;
2371 *lvalp
= jiffies_to_clock_t(lval
);
2376 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2378 int write
, void *data
)
2381 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2391 lval
= (unsigned long)-val
;
2394 lval
= (unsigned long)val
;
2396 *lvalp
= jiffies_to_msecs(lval
);
2402 * proc_dointvec_jiffies - read a vector of integers as seconds
2403 * @table: the sysctl table
2404 * @write: %TRUE if this is a write to the sysctl file
2405 * @buffer: the user buffer
2406 * @lenp: the size of the user buffer
2407 * @ppos: file position
2409 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2410 * values from/to the user buffer, treated as an ASCII string.
2411 * The values read are assumed to be in seconds, and are converted into
2414 * Returns 0 on success.
2416 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2417 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2419 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2420 do_proc_dointvec_jiffies_conv
,NULL
);
2424 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2425 * @table: the sysctl table
2426 * @write: %TRUE if this is a write to the sysctl file
2427 * @buffer: the user buffer
2428 * @lenp: the size of the user buffer
2429 * @ppos: pointer to the file position
2431 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2432 * values from/to the user buffer, treated as an ASCII string.
2433 * The values read are assumed to be in 1/USER_HZ seconds, and
2434 * are converted into jiffies.
2436 * Returns 0 on success.
2438 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2439 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2441 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2442 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2446 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2447 * @table: the sysctl table
2448 * @write: %TRUE if this is a write to the sysctl file
2449 * @buffer: the user buffer
2450 * @lenp: the size of the user buffer
2451 * @ppos: file position
2452 * @ppos: the current position in the file
2454 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2455 * values from/to the user buffer, treated as an ASCII string.
2456 * The values read are assumed to be in 1/1000 seconds, and
2457 * are converted into jiffies.
2459 * Returns 0 on success.
2461 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2462 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2464 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2465 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2468 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2469 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2471 struct pid
*new_pid
;
2475 tmp
= pid_vnr(cad_pid
);
2477 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2478 lenp
, ppos
, NULL
, NULL
);
2482 new_pid
= find_get_pid(tmp
);
2486 put_pid(xchg(&cad_pid
, new_pid
));
2491 * proc_do_large_bitmap - read/write from/to a large bitmap
2492 * @table: the sysctl table
2493 * @write: %TRUE if this is a write to the sysctl file
2494 * @buffer: the user buffer
2495 * @lenp: the size of the user buffer
2496 * @ppos: file position
2498 * The bitmap is stored at table->data and the bitmap length (in bits)
2501 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2502 * large bitmaps may be represented in a compact manner. Writing into
2503 * the file will clear the bitmap then update it with the given input.
2505 * Returns 0 on success.
2507 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2508 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2512 size_t left
= *lenp
;
2513 unsigned long bitmap_len
= table
->maxlen
;
2514 unsigned long *bitmap
= (unsigned long *) table
->data
;
2515 unsigned long *tmp_bitmap
= NULL
;
2516 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2518 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2524 unsigned long page
= 0;
2527 if (left
> PAGE_SIZE
- 1)
2528 left
= PAGE_SIZE
- 1;
2530 page
= __get_free_page(GFP_TEMPORARY
);
2531 kbuf
= (char *) page
;
2534 if (copy_from_user(kbuf
, buffer
, left
)) {
2540 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2546 proc_skip_char(&kbuf
, &left
, '\n');
2547 while (!err
&& left
) {
2548 unsigned long val_a
, val_b
;
2551 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2555 if (val_a
>= bitmap_len
|| neg
) {
2567 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2568 &neg
, tr_b
, sizeof(tr_b
),
2572 if (val_b
>= bitmap_len
|| neg
||
2583 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2585 proc_skip_char(&kbuf
, &left
, '\n');
2589 unsigned long bit_a
, bit_b
= 0;
2592 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2593 if (bit_a
>= bitmap_len
)
2595 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2599 err
= proc_put_char(&buffer
, &left
, ',');
2603 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2606 if (bit_a
!= bit_b
) {
2607 err
= proc_put_char(&buffer
, &left
, '-');
2610 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2618 err
= proc_put_char(&buffer
, &left
, '\n');
2624 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2626 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2638 #else /* CONFIG_PROC_SYSCTL */
2640 int proc_dostring(struct ctl_table
*table
, int write
,
2641 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2646 int proc_dointvec(struct ctl_table
*table
, int write
,
2647 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2652 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2653 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2658 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2659 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2664 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2665 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2670 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2671 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2676 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2677 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2682 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2683 void __user
*buffer
,
2684 size_t *lenp
, loff_t
*ppos
)
2690 #endif /* CONFIG_PROC_SYSCTL */
2693 * No sense putting this after each symbol definition, twice,
2694 * exception granted :-)
2696 EXPORT_SYMBOL(proc_dointvec
);
2697 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2698 EXPORT_SYMBOL(proc_dointvec_minmax
);
2699 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2700 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2701 EXPORT_SYMBOL(proc_dostring
);
2702 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2703 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);