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 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty
= 60;
121 static int __maybe_unused neg_one
= -1;
124 static int __maybe_unused one
= 1;
125 static int __maybe_unused two
= 2;
126 static int __maybe_unused three
= 3;
127 static unsigned long one_ul
= 1;
128 static int one_hundred
= 100;
130 static int ten_thousand
= 10000;
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid
= 65535;
138 static int minolduid
;
139 static int min_percpu_pagelist_fract
= 8;
141 static int ngroups_max
= NGROUPS_MAX
;
142 static const int cap_last_cap
= CAP_LAST_CAP
;
144 #ifdef CONFIG_INOTIFY_USER
145 #include <linux/inotify.h>
150 #ifdef CONFIG_SPARC64
151 extern int sysctl_tsb_ratio
;
155 extern int pwrsw_enabled
;
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled
;
163 extern int unaligned_dump_stack
;
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning
;
170 #ifdef CONFIG_PROC_SYSCTL
171 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
172 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
173 static int proc_taint(struct ctl_table
*table
, int write
,
174 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
178 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
179 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
182 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
183 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
184 #ifdef CONFIG_COREDUMP
185 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
186 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
189 #ifdef CONFIG_MAGIC_SYSRQ
190 /* Note: sysrq code uses it's own private copy */
191 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
193 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
194 void __user
*buffer
, size_t *lenp
,
199 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
204 sysrq_toggle_support(__sysrq_enabled
);
211 static struct ctl_table kern_table
[];
212 static struct ctl_table vm_table
[];
213 static struct ctl_table fs_table
[];
214 static struct ctl_table debug_table
[];
215 static struct ctl_table dev_table
[];
216 extern struct ctl_table random_table
[];
218 extern struct ctl_table epoll_table
[];
221 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
222 int sysctl_legacy_va_layout
;
225 /* The default sysctl tables: */
227 static struct ctl_table sysctl_base_table
[] = {
229 .procname
= "kernel",
246 .child
= debug_table
,
256 #ifdef CONFIG_SCHED_DEBUG
257 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
258 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
259 static int min_wakeup_granularity_ns
; /* 0 usecs */
260 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
262 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
263 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
264 #endif /* CONFIG_SMP */
265 #endif /* CONFIG_SCHED_DEBUG */
267 #ifdef CONFIG_COMPACTION
268 static int min_extfrag_threshold
;
269 static int max_extfrag_threshold
= 1000;
272 static struct ctl_table kern_table
[] = {
274 .procname
= "sched_child_runs_first",
275 .data
= &sysctl_sched_child_runs_first
,
276 .maxlen
= sizeof(unsigned int),
278 .proc_handler
= proc_dointvec
,
280 #ifdef CONFIG_SCHED_DEBUG
282 .procname
= "sched_min_granularity_ns",
283 .data
= &sysctl_sched_min_granularity
,
284 .maxlen
= sizeof(unsigned int),
286 .proc_handler
= sched_proc_update_handler
,
287 .extra1
= &min_sched_granularity_ns
,
288 .extra2
= &max_sched_granularity_ns
,
291 .procname
= "sched_latency_ns",
292 .data
= &sysctl_sched_latency
,
293 .maxlen
= sizeof(unsigned int),
295 .proc_handler
= sched_proc_update_handler
,
296 .extra1
= &min_sched_granularity_ns
,
297 .extra2
= &max_sched_granularity_ns
,
300 .procname
= "sched_wakeup_granularity_ns",
301 .data
= &sysctl_sched_wakeup_granularity
,
302 .maxlen
= sizeof(unsigned int),
304 .proc_handler
= sched_proc_update_handler
,
305 .extra1
= &min_wakeup_granularity_ns
,
306 .extra2
= &max_wakeup_granularity_ns
,
310 .procname
= "sched_tunable_scaling",
311 .data
= &sysctl_sched_tunable_scaling
,
312 .maxlen
= sizeof(enum sched_tunable_scaling
),
314 .proc_handler
= sched_proc_update_handler
,
315 .extra1
= &min_sched_tunable_scaling
,
316 .extra2
= &max_sched_tunable_scaling
,
319 .procname
= "sched_migration_cost_ns",
320 .data
= &sysctl_sched_migration_cost
,
321 .maxlen
= sizeof(unsigned int),
323 .proc_handler
= proc_dointvec
,
326 .procname
= "sched_nr_migrate",
327 .data
= &sysctl_sched_nr_migrate
,
328 .maxlen
= sizeof(unsigned int),
330 .proc_handler
= proc_dointvec
,
333 .procname
= "sched_time_avg_ms",
334 .data
= &sysctl_sched_time_avg
,
335 .maxlen
= sizeof(unsigned int),
337 .proc_handler
= proc_dointvec
,
340 .procname
= "sched_shares_window_ns",
341 .data
= &sysctl_sched_shares_window
,
342 .maxlen
= sizeof(unsigned int),
344 .proc_handler
= proc_dointvec
,
347 .procname
= "timer_migration",
348 .data
= &sysctl_timer_migration
,
349 .maxlen
= sizeof(unsigned int),
351 .proc_handler
= proc_dointvec_minmax
,
355 #endif /* CONFIG_SMP */
356 #ifdef CONFIG_NUMA_BALANCING
358 .procname
= "numa_balancing_scan_delay_ms",
359 .data
= &sysctl_numa_balancing_scan_delay
,
360 .maxlen
= sizeof(unsigned int),
362 .proc_handler
= proc_dointvec
,
365 .procname
= "numa_balancing_scan_period_min_ms",
366 .data
= &sysctl_numa_balancing_scan_period_min
,
367 .maxlen
= sizeof(unsigned int),
369 .proc_handler
= proc_dointvec
,
372 .procname
= "numa_balancing_scan_period_max_ms",
373 .data
= &sysctl_numa_balancing_scan_period_max
,
374 .maxlen
= sizeof(unsigned int),
376 .proc_handler
= proc_dointvec
,
379 .procname
= "numa_balancing_scan_size_mb",
380 .data
= &sysctl_numa_balancing_scan_size
,
381 .maxlen
= sizeof(unsigned int),
383 .proc_handler
= proc_dointvec
,
386 .procname
= "numa_balancing",
387 .data
= NULL
, /* filled in by handler */
388 .maxlen
= sizeof(unsigned int),
390 .proc_handler
= sysctl_numa_balancing
,
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
,
612 .procname
= "kexec_load_disabled",
613 .data
= &kexec_load_disabled
,
614 .maxlen
= sizeof(int),
616 /* only handle a transition from default "0" to "1" */
617 .proc_handler
= proc_dointvec_minmax
,
622 #ifdef CONFIG_MODULES
624 .procname
= "modprobe",
625 .data
= &modprobe_path
,
626 .maxlen
= KMOD_PATH_LEN
,
628 .proc_handler
= proc_dostring
,
631 .procname
= "modules_disabled",
632 .data
= &modules_disabled
,
633 .maxlen
= sizeof(int),
635 /* only handle a transition from default "0" to "1" */
636 .proc_handler
= proc_dointvec_minmax
,
643 .procname
= "hotplug",
644 .data
= &uevent_helper
,
645 .maxlen
= UEVENT_HELPER_PATH_LEN
,
647 .proc_handler
= proc_dostring
,
650 #ifdef CONFIG_CHR_DEV_SG
652 .procname
= "sg-big-buff",
653 .data
= &sg_big_buff
,
654 .maxlen
= sizeof (int),
656 .proc_handler
= proc_dointvec
,
659 #ifdef CONFIG_BSD_PROCESS_ACCT
663 .maxlen
= 3*sizeof(int),
665 .proc_handler
= proc_dointvec
,
668 #ifdef CONFIG_MAGIC_SYSRQ
671 .data
= &__sysrq_enabled
,
672 .maxlen
= sizeof (int),
674 .proc_handler
= sysrq_sysctl_handler
,
677 #ifdef CONFIG_PROC_SYSCTL
679 .procname
= "cad_pid",
681 .maxlen
= sizeof (int),
683 .proc_handler
= proc_do_cad_pid
,
687 .procname
= "threads-max",
688 .data
= &max_threads
,
689 .maxlen
= sizeof(int),
691 .proc_handler
= proc_dointvec
,
694 .procname
= "random",
696 .child
= random_table
,
699 .procname
= "usermodehelper",
701 .child
= usermodehelper_table
,
704 .procname
= "overflowuid",
705 .data
= &overflowuid
,
706 .maxlen
= sizeof(int),
708 .proc_handler
= proc_dointvec_minmax
,
709 .extra1
= &minolduid
,
710 .extra2
= &maxolduid
,
713 .procname
= "overflowgid",
714 .data
= &overflowgid
,
715 .maxlen
= sizeof(int),
717 .proc_handler
= proc_dointvec_minmax
,
718 .extra1
= &minolduid
,
719 .extra2
= &maxolduid
,
722 #ifdef CONFIG_MATHEMU
724 .procname
= "ieee_emulation_warnings",
725 .data
= &sysctl_ieee_emulation_warnings
,
726 .maxlen
= sizeof(int),
728 .proc_handler
= proc_dointvec
,
732 .procname
= "userprocess_debug",
733 .data
= &show_unhandled_signals
,
734 .maxlen
= sizeof(int),
736 .proc_handler
= proc_dointvec
,
740 .procname
= "pid_max",
742 .maxlen
= sizeof (int),
744 .proc_handler
= proc_dointvec_minmax
,
745 .extra1
= &pid_max_min
,
746 .extra2
= &pid_max_max
,
749 .procname
= "panic_on_oops",
750 .data
= &panic_on_oops
,
751 .maxlen
= sizeof(int),
753 .proc_handler
= proc_dointvec
,
755 #if defined CONFIG_PRINTK
757 .procname
= "printk",
758 .data
= &console_loglevel
,
759 .maxlen
= 4*sizeof(int),
761 .proc_handler
= proc_dointvec
,
764 .procname
= "printk_ratelimit",
765 .data
= &printk_ratelimit_state
.interval
,
766 .maxlen
= sizeof(int),
768 .proc_handler
= proc_dointvec_jiffies
,
771 .procname
= "printk_ratelimit_burst",
772 .data
= &printk_ratelimit_state
.burst
,
773 .maxlen
= sizeof(int),
775 .proc_handler
= proc_dointvec
,
778 .procname
= "printk_delay",
779 .data
= &printk_delay_msec
,
780 .maxlen
= sizeof(int),
782 .proc_handler
= proc_dointvec_minmax
,
784 .extra2
= &ten_thousand
,
787 .procname
= "dmesg_restrict",
788 .data
= &dmesg_restrict
,
789 .maxlen
= sizeof(int),
791 .proc_handler
= proc_dointvec_minmax_sysadmin
,
796 .procname
= "kptr_restrict",
797 .data
= &kptr_restrict
,
798 .maxlen
= sizeof(int),
800 .proc_handler
= proc_dointvec_minmax_sysadmin
,
806 .procname
= "ngroups_max",
807 .data
= &ngroups_max
,
808 .maxlen
= sizeof (int),
810 .proc_handler
= proc_dointvec
,
813 .procname
= "cap_last_cap",
814 .data
= (void *)&cap_last_cap
,
815 .maxlen
= sizeof(int),
817 .proc_handler
= proc_dointvec
,
819 #if defined(CONFIG_LOCKUP_DETECTOR)
821 .procname
= "watchdog",
822 .data
= &watchdog_user_enabled
,
823 .maxlen
= sizeof (int),
825 .proc_handler
= proc_dowatchdog
,
830 .procname
= "watchdog_thresh",
831 .data
= &watchdog_thresh
,
832 .maxlen
= sizeof(int),
834 .proc_handler
= proc_dowatchdog
,
839 .procname
= "softlockup_panic",
840 .data
= &softlockup_panic
,
841 .maxlen
= sizeof(int),
843 .proc_handler
= proc_dointvec_minmax
,
848 .procname
= "nmi_watchdog",
849 .data
= &watchdog_user_enabled
,
850 .maxlen
= sizeof (int),
852 .proc_handler
= proc_dowatchdog
,
857 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
859 .procname
= "unknown_nmi_panic",
860 .data
= &unknown_nmi_panic
,
861 .maxlen
= sizeof (int),
863 .proc_handler
= proc_dointvec
,
866 #if defined(CONFIG_X86)
868 .procname
= "panic_on_unrecovered_nmi",
869 .data
= &panic_on_unrecovered_nmi
,
870 .maxlen
= sizeof(int),
872 .proc_handler
= proc_dointvec
,
875 .procname
= "panic_on_io_nmi",
876 .data
= &panic_on_io_nmi
,
877 .maxlen
= sizeof(int),
879 .proc_handler
= proc_dointvec
,
881 #ifdef CONFIG_DEBUG_STACKOVERFLOW
883 .procname
= "panic_on_stackoverflow",
884 .data
= &sysctl_panic_on_stackoverflow
,
885 .maxlen
= sizeof(int),
887 .proc_handler
= proc_dointvec
,
891 .procname
= "bootloader_type",
892 .data
= &bootloader_type
,
893 .maxlen
= sizeof (int),
895 .proc_handler
= proc_dointvec
,
898 .procname
= "bootloader_version",
899 .data
= &bootloader_version
,
900 .maxlen
= sizeof (int),
902 .proc_handler
= proc_dointvec
,
905 .procname
= "kstack_depth_to_print",
906 .data
= &kstack_depth_to_print
,
907 .maxlen
= sizeof(int),
909 .proc_handler
= proc_dointvec
,
912 .procname
= "io_delay_type",
913 .data
= &io_delay_type
,
914 .maxlen
= sizeof(int),
916 .proc_handler
= proc_dointvec
,
919 #if defined(CONFIG_MMU)
921 .procname
= "randomize_va_space",
922 .data
= &randomize_va_space
,
923 .maxlen
= sizeof(int),
925 .proc_handler
= proc_dointvec
,
928 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
930 .procname
= "spin_retry",
932 .maxlen
= sizeof (int),
934 .proc_handler
= proc_dointvec
,
937 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
939 .procname
= "acpi_video_flags",
940 .data
= &acpi_realmode_flags
,
941 .maxlen
= sizeof (unsigned long),
943 .proc_handler
= proc_doulongvec_minmax
,
946 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
948 .procname
= "ignore-unaligned-usertrap",
949 .data
= &no_unaligned_warning
,
950 .maxlen
= sizeof (int),
952 .proc_handler
= proc_dointvec
,
957 .procname
= "unaligned-dump-stack",
958 .data
= &unaligned_dump_stack
,
959 .maxlen
= sizeof (int),
961 .proc_handler
= proc_dointvec
,
964 #ifdef CONFIG_DETECT_HUNG_TASK
966 .procname
= "hung_task_panic",
967 .data
= &sysctl_hung_task_panic
,
968 .maxlen
= sizeof(int),
970 .proc_handler
= proc_dointvec_minmax
,
975 .procname
= "hung_task_check_count",
976 .data
= &sysctl_hung_task_check_count
,
977 .maxlen
= sizeof(int),
979 .proc_handler
= proc_dointvec_minmax
,
983 .procname
= "hung_task_timeout_secs",
984 .data
= &sysctl_hung_task_timeout_secs
,
985 .maxlen
= sizeof(unsigned long),
987 .proc_handler
= proc_dohung_task_timeout_secs
,
990 .procname
= "hung_task_warnings",
991 .data
= &sysctl_hung_task_warnings
,
992 .maxlen
= sizeof(int),
994 .proc_handler
= proc_dointvec_minmax
,
1000 .procname
= "compat-log",
1001 .data
= &compat_log
,
1002 .maxlen
= sizeof (int),
1004 .proc_handler
= proc_dointvec
,
1007 #ifdef CONFIG_RT_MUTEXES
1009 .procname
= "max_lock_depth",
1010 .data
= &max_lock_depth
,
1011 .maxlen
= sizeof(int),
1013 .proc_handler
= proc_dointvec
,
1017 .procname
= "poweroff_cmd",
1018 .data
= &poweroff_cmd
,
1019 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1021 .proc_handler
= proc_dostring
,
1027 .child
= key_sysctls
,
1030 #ifdef CONFIG_RCU_TORTURE_TEST
1032 .procname
= "rcutorture_runnable",
1033 .data
= &rcutorture_runnable
,
1034 .maxlen
= sizeof(int),
1036 .proc_handler
= proc_dointvec
,
1039 #ifdef CONFIG_PERF_EVENTS
1041 * User-space scripts rely on the existence of this file
1042 * as a feature check for perf_events being enabled.
1044 * So it's an ABI, do not remove!
1047 .procname
= "perf_event_paranoid",
1048 .data
= &sysctl_perf_event_paranoid
,
1049 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1051 .proc_handler
= proc_dointvec
,
1054 .procname
= "perf_event_mlock_kb",
1055 .data
= &sysctl_perf_event_mlock
,
1056 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1058 .proc_handler
= proc_dointvec
,
1061 .procname
= "perf_event_max_sample_rate",
1062 .data
= &sysctl_perf_event_sample_rate
,
1063 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1065 .proc_handler
= perf_proc_update_handler
,
1069 .procname
= "perf_cpu_time_max_percent",
1070 .data
= &sysctl_perf_cpu_time_max_percent
,
1071 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1073 .proc_handler
= perf_cpu_time_max_percent_handler
,
1075 .extra2
= &one_hundred
,
1078 #ifdef CONFIG_KMEMCHECK
1080 .procname
= "kmemcheck",
1081 .data
= &kmemcheck_enabled
,
1082 .maxlen
= sizeof(int),
1084 .proc_handler
= proc_dointvec
,
1090 static struct ctl_table vm_table
[] = {
1092 .procname
= "overcommit_memory",
1093 .data
= &sysctl_overcommit_memory
,
1094 .maxlen
= sizeof(sysctl_overcommit_memory
),
1096 .proc_handler
= proc_dointvec_minmax
,
1101 .procname
= "panic_on_oom",
1102 .data
= &sysctl_panic_on_oom
,
1103 .maxlen
= sizeof(sysctl_panic_on_oom
),
1105 .proc_handler
= proc_dointvec_minmax
,
1110 .procname
= "oom_kill_allocating_task",
1111 .data
= &sysctl_oom_kill_allocating_task
,
1112 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1114 .proc_handler
= proc_dointvec
,
1117 .procname
= "oom_dump_tasks",
1118 .data
= &sysctl_oom_dump_tasks
,
1119 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1121 .proc_handler
= proc_dointvec
,
1124 .procname
= "overcommit_ratio",
1125 .data
= &sysctl_overcommit_ratio
,
1126 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1128 .proc_handler
= overcommit_ratio_handler
,
1131 .procname
= "overcommit_kbytes",
1132 .data
= &sysctl_overcommit_kbytes
,
1133 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1135 .proc_handler
= overcommit_kbytes_handler
,
1138 .procname
= "page-cluster",
1139 .data
= &page_cluster
,
1140 .maxlen
= sizeof(int),
1142 .proc_handler
= proc_dointvec_minmax
,
1146 .procname
= "dirty_background_ratio",
1147 .data
= &dirty_background_ratio
,
1148 .maxlen
= sizeof(dirty_background_ratio
),
1150 .proc_handler
= dirty_background_ratio_handler
,
1152 .extra2
= &one_hundred
,
1155 .procname
= "dirty_background_bytes",
1156 .data
= &dirty_background_bytes
,
1157 .maxlen
= sizeof(dirty_background_bytes
),
1159 .proc_handler
= dirty_background_bytes_handler
,
1163 .procname
= "dirty_ratio",
1164 .data
= &vm_dirty_ratio
,
1165 .maxlen
= sizeof(vm_dirty_ratio
),
1167 .proc_handler
= dirty_ratio_handler
,
1169 .extra2
= &one_hundred
,
1172 .procname
= "dirty_bytes",
1173 .data
= &vm_dirty_bytes
,
1174 .maxlen
= sizeof(vm_dirty_bytes
),
1176 .proc_handler
= dirty_bytes_handler
,
1177 .extra1
= &dirty_bytes_min
,
1180 .procname
= "dirty_writeback_centisecs",
1181 .data
= &dirty_writeback_interval
,
1182 .maxlen
= sizeof(dirty_writeback_interval
),
1184 .proc_handler
= dirty_writeback_centisecs_handler
,
1187 .procname
= "dirty_expire_centisecs",
1188 .data
= &dirty_expire_interval
,
1189 .maxlen
= sizeof(dirty_expire_interval
),
1191 .proc_handler
= proc_dointvec_minmax
,
1195 .procname
= "nr_pdflush_threads",
1196 .mode
= 0444 /* read-only */,
1197 .proc_handler
= pdflush_proc_obsolete
,
1200 .procname
= "swappiness",
1201 .data
= &vm_swappiness
,
1202 .maxlen
= sizeof(vm_swappiness
),
1204 .proc_handler
= proc_dointvec_minmax
,
1206 .extra2
= &one_hundred
,
1208 #ifdef CONFIG_HUGETLB_PAGE
1210 .procname
= "nr_hugepages",
1212 .maxlen
= sizeof(unsigned long),
1214 .proc_handler
= hugetlb_sysctl_handler
,
1215 .extra1
= (void *)&hugetlb_zero
,
1216 .extra2
= (void *)&hugetlb_infinity
,
1220 .procname
= "nr_hugepages_mempolicy",
1222 .maxlen
= sizeof(unsigned long),
1224 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1225 .extra1
= (void *)&hugetlb_zero
,
1226 .extra2
= (void *)&hugetlb_infinity
,
1230 .procname
= "hugetlb_shm_group",
1231 .data
= &sysctl_hugetlb_shm_group
,
1232 .maxlen
= sizeof(gid_t
),
1234 .proc_handler
= proc_dointvec
,
1237 .procname
= "hugepages_treat_as_movable",
1238 .data
= &hugepages_treat_as_movable
,
1239 .maxlen
= sizeof(int),
1241 .proc_handler
= proc_dointvec
,
1244 .procname
= "nr_overcommit_hugepages",
1246 .maxlen
= sizeof(unsigned long),
1248 .proc_handler
= hugetlb_overcommit_handler
,
1249 .extra1
= (void *)&hugetlb_zero
,
1250 .extra2
= (void *)&hugetlb_infinity
,
1254 .procname
= "lowmem_reserve_ratio",
1255 .data
= &sysctl_lowmem_reserve_ratio
,
1256 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1258 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1261 .procname
= "drop_caches",
1262 .data
= &sysctl_drop_caches
,
1263 .maxlen
= sizeof(int),
1265 .proc_handler
= drop_caches_sysctl_handler
,
1269 #ifdef CONFIG_COMPACTION
1271 .procname
= "compact_memory",
1272 .data
= &sysctl_compact_memory
,
1273 .maxlen
= sizeof(int),
1275 .proc_handler
= sysctl_compaction_handler
,
1278 .procname
= "extfrag_threshold",
1279 .data
= &sysctl_extfrag_threshold
,
1280 .maxlen
= sizeof(int),
1282 .proc_handler
= sysctl_extfrag_handler
,
1283 .extra1
= &min_extfrag_threshold
,
1284 .extra2
= &max_extfrag_threshold
,
1287 #endif /* CONFIG_COMPACTION */
1289 .procname
= "min_free_kbytes",
1290 .data
= &min_free_kbytes
,
1291 .maxlen
= sizeof(min_free_kbytes
),
1293 .proc_handler
= min_free_kbytes_sysctl_handler
,
1297 .procname
= "percpu_pagelist_fraction",
1298 .data
= &percpu_pagelist_fraction
,
1299 .maxlen
= sizeof(percpu_pagelist_fraction
),
1301 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1302 .extra1
= &min_percpu_pagelist_fract
,
1306 .procname
= "max_map_count",
1307 .data
= &sysctl_max_map_count
,
1308 .maxlen
= sizeof(sysctl_max_map_count
),
1310 .proc_handler
= proc_dointvec_minmax
,
1315 .procname
= "nr_trim_pages",
1316 .data
= &sysctl_nr_trim_pages
,
1317 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1319 .proc_handler
= proc_dointvec_minmax
,
1324 .procname
= "laptop_mode",
1325 .data
= &laptop_mode
,
1326 .maxlen
= sizeof(laptop_mode
),
1328 .proc_handler
= proc_dointvec_jiffies
,
1331 .procname
= "block_dump",
1332 .data
= &block_dump
,
1333 .maxlen
= sizeof(block_dump
),
1335 .proc_handler
= proc_dointvec
,
1339 .procname
= "vfs_cache_pressure",
1340 .data
= &sysctl_vfs_cache_pressure
,
1341 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1343 .proc_handler
= proc_dointvec
,
1346 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1348 .procname
= "legacy_va_layout",
1349 .data
= &sysctl_legacy_va_layout
,
1350 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1352 .proc_handler
= proc_dointvec
,
1358 .procname
= "zone_reclaim_mode",
1359 .data
= &zone_reclaim_mode
,
1360 .maxlen
= sizeof(zone_reclaim_mode
),
1362 .proc_handler
= proc_dointvec
,
1366 .procname
= "min_unmapped_ratio",
1367 .data
= &sysctl_min_unmapped_ratio
,
1368 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1370 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1372 .extra2
= &one_hundred
,
1375 .procname
= "min_slab_ratio",
1376 .data
= &sysctl_min_slab_ratio
,
1377 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1379 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1381 .extra2
= &one_hundred
,
1386 .procname
= "stat_interval",
1387 .data
= &sysctl_stat_interval
,
1388 .maxlen
= sizeof(sysctl_stat_interval
),
1390 .proc_handler
= proc_dointvec_jiffies
,
1395 .procname
= "mmap_min_addr",
1396 .data
= &dac_mmap_min_addr
,
1397 .maxlen
= sizeof(unsigned long),
1399 .proc_handler
= mmap_min_addr_handler
,
1404 .procname
= "numa_zonelist_order",
1405 .data
= &numa_zonelist_order
,
1406 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1408 .proc_handler
= numa_zonelist_order_handler
,
1411 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1412 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1414 .procname
= "vdso_enabled",
1415 .data
= &vdso_enabled
,
1416 .maxlen
= sizeof(vdso_enabled
),
1418 .proc_handler
= proc_dointvec
,
1422 #ifdef CONFIG_HIGHMEM
1424 .procname
= "highmem_is_dirtyable",
1425 .data
= &vm_highmem_is_dirtyable
,
1426 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1428 .proc_handler
= proc_dointvec_minmax
,
1434 .procname
= "scan_unevictable_pages",
1435 .data
= &scan_unevictable_pages
,
1436 .maxlen
= sizeof(scan_unevictable_pages
),
1438 .proc_handler
= scan_unevictable_handler
,
1440 #ifdef CONFIG_MEMORY_FAILURE
1442 .procname
= "memory_failure_early_kill",
1443 .data
= &sysctl_memory_failure_early_kill
,
1444 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1446 .proc_handler
= proc_dointvec_minmax
,
1451 .procname
= "memory_failure_recovery",
1452 .data
= &sysctl_memory_failure_recovery
,
1453 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1455 .proc_handler
= proc_dointvec_minmax
,
1461 .procname
= "user_reserve_kbytes",
1462 .data
= &sysctl_user_reserve_kbytes
,
1463 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1465 .proc_handler
= proc_doulongvec_minmax
,
1468 .procname
= "admin_reserve_kbytes",
1469 .data
= &sysctl_admin_reserve_kbytes
,
1470 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1472 .proc_handler
= proc_doulongvec_minmax
,
1477 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1478 static struct ctl_table binfmt_misc_table
[] = {
1483 static struct ctl_table fs_table
[] = {
1485 .procname
= "inode-nr",
1486 .data
= &inodes_stat
,
1487 .maxlen
= 2*sizeof(long),
1489 .proc_handler
= proc_nr_inodes
,
1492 .procname
= "inode-state",
1493 .data
= &inodes_stat
,
1494 .maxlen
= 7*sizeof(long),
1496 .proc_handler
= proc_nr_inodes
,
1499 .procname
= "file-nr",
1500 .data
= &files_stat
,
1501 .maxlen
= sizeof(files_stat
),
1503 .proc_handler
= proc_nr_files
,
1506 .procname
= "file-max",
1507 .data
= &files_stat
.max_files
,
1508 .maxlen
= sizeof(files_stat
.max_files
),
1510 .proc_handler
= proc_doulongvec_minmax
,
1513 .procname
= "nr_open",
1514 .data
= &sysctl_nr_open
,
1515 .maxlen
= sizeof(int),
1517 .proc_handler
= proc_dointvec_minmax
,
1518 .extra1
= &sysctl_nr_open_min
,
1519 .extra2
= &sysctl_nr_open_max
,
1522 .procname
= "dentry-state",
1523 .data
= &dentry_stat
,
1524 .maxlen
= 6*sizeof(long),
1526 .proc_handler
= proc_nr_dentry
,
1529 .procname
= "overflowuid",
1530 .data
= &fs_overflowuid
,
1531 .maxlen
= sizeof(int),
1533 .proc_handler
= proc_dointvec_minmax
,
1534 .extra1
= &minolduid
,
1535 .extra2
= &maxolduid
,
1538 .procname
= "overflowgid",
1539 .data
= &fs_overflowgid
,
1540 .maxlen
= sizeof(int),
1542 .proc_handler
= proc_dointvec_minmax
,
1543 .extra1
= &minolduid
,
1544 .extra2
= &maxolduid
,
1546 #ifdef CONFIG_FILE_LOCKING
1548 .procname
= "leases-enable",
1549 .data
= &leases_enable
,
1550 .maxlen
= sizeof(int),
1552 .proc_handler
= proc_dointvec
,
1555 #ifdef CONFIG_DNOTIFY
1557 .procname
= "dir-notify-enable",
1558 .data
= &dir_notify_enable
,
1559 .maxlen
= sizeof(int),
1561 .proc_handler
= proc_dointvec
,
1565 #ifdef CONFIG_FILE_LOCKING
1567 .procname
= "lease-break-time",
1568 .data
= &lease_break_time
,
1569 .maxlen
= sizeof(int),
1571 .proc_handler
= proc_dointvec
,
1576 .procname
= "aio-nr",
1578 .maxlen
= sizeof(aio_nr
),
1580 .proc_handler
= proc_doulongvec_minmax
,
1583 .procname
= "aio-max-nr",
1584 .data
= &aio_max_nr
,
1585 .maxlen
= sizeof(aio_max_nr
),
1587 .proc_handler
= proc_doulongvec_minmax
,
1589 #endif /* CONFIG_AIO */
1590 #ifdef CONFIG_INOTIFY_USER
1592 .procname
= "inotify",
1594 .child
= inotify_table
,
1599 .procname
= "epoll",
1601 .child
= epoll_table
,
1606 .procname
= "protected_symlinks",
1607 .data
= &sysctl_protected_symlinks
,
1608 .maxlen
= sizeof(int),
1610 .proc_handler
= proc_dointvec_minmax
,
1615 .procname
= "protected_hardlinks",
1616 .data
= &sysctl_protected_hardlinks
,
1617 .maxlen
= sizeof(int),
1619 .proc_handler
= proc_dointvec_minmax
,
1624 .procname
= "suid_dumpable",
1625 .data
= &suid_dumpable
,
1626 .maxlen
= sizeof(int),
1628 .proc_handler
= proc_dointvec_minmax_coredump
,
1632 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1634 .procname
= "binfmt_misc",
1636 .child
= binfmt_misc_table
,
1640 .procname
= "pipe-max-size",
1641 .data
= &pipe_max_size
,
1642 .maxlen
= sizeof(int),
1644 .proc_handler
= &pipe_proc_fn
,
1645 .extra1
= &pipe_min_size
,
1650 static struct ctl_table debug_table
[] = {
1651 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1653 .procname
= "exception-trace",
1654 .data
= &show_unhandled_signals
,
1655 .maxlen
= sizeof(int),
1657 .proc_handler
= proc_dointvec
1660 #if defined(CONFIG_OPTPROBES)
1662 .procname
= "kprobes-optimization",
1663 .data
= &sysctl_kprobes_optimization
,
1664 .maxlen
= sizeof(int),
1666 .proc_handler
= proc_kprobes_optimization_handler
,
1674 static struct ctl_table dev_table
[] = {
1678 int __init
sysctl_init(void)
1680 struct ctl_table_header
*hdr
;
1682 hdr
= register_sysctl_table(sysctl_base_table
);
1683 kmemleak_not_leak(hdr
);
1687 #endif /* CONFIG_SYSCTL */
1693 #ifdef CONFIG_PROC_SYSCTL
1695 static int _proc_do_string(void* data
, int maxlen
, int write
,
1696 void __user
*buffer
,
1697 size_t *lenp
, loff_t
*ppos
)
1703 if (!data
|| !maxlen
|| !*lenp
) {
1711 while (len
< *lenp
) {
1712 if (get_user(c
, p
++))
1714 if (c
== 0 || c
== '\n')
1720 if(copy_from_user(data
, buffer
, len
))
1722 ((char *) data
)[len
] = 0;
1740 if(copy_to_user(buffer
, data
, len
))
1743 if(put_user('\n', ((char __user
*) buffer
) + len
))
1754 * proc_dostring - read a string sysctl
1755 * @table: the sysctl table
1756 * @write: %TRUE if this is a write to the sysctl file
1757 * @buffer: the user buffer
1758 * @lenp: the size of the user buffer
1759 * @ppos: file position
1761 * Reads/writes a string from/to the user buffer. If the kernel
1762 * buffer provided is not large enough to hold the string, the
1763 * string is truncated. The copied string is %NULL-terminated.
1764 * If the string is being read by the user process, it is copied
1765 * and a newline '\n' is added. It is truncated if the buffer is
1768 * Returns 0 on success.
1770 int proc_dostring(struct ctl_table
*table
, int write
,
1771 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1773 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1774 buffer
, lenp
, ppos
);
1777 static size_t proc_skip_spaces(char **buf
)
1780 char *tmp
= skip_spaces(*buf
);
1786 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1796 #define TMPBUFLEN 22
1798 * proc_get_long - reads an ASCII formatted integer from a user buffer
1800 * @buf: a kernel buffer
1801 * @size: size of the kernel buffer
1802 * @val: this is where the number will be stored
1803 * @neg: set to %TRUE if number is negative
1804 * @perm_tr: a vector which contains the allowed trailers
1805 * @perm_tr_len: size of the perm_tr vector
1806 * @tr: pointer to store the trailer character
1808 * In case of success %0 is returned and @buf and @size are updated with
1809 * the amount of bytes read. If @tr is non-NULL and a trailing
1810 * character exists (size is non-zero after returning from this
1811 * function), @tr is updated with the trailing character.
1813 static int proc_get_long(char **buf
, size_t *size
,
1814 unsigned long *val
, bool *neg
,
1815 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1818 char *p
, tmp
[TMPBUFLEN
];
1824 if (len
> TMPBUFLEN
- 1)
1825 len
= TMPBUFLEN
- 1;
1827 memcpy(tmp
, *buf
, len
);
1831 if (*p
== '-' && *size
> 1) {
1839 *val
= simple_strtoul(p
, &p
, 0);
1843 /* We don't know if the next char is whitespace thus we may accept
1844 * invalid integers (e.g. 1234...a) or two integers instead of one
1845 * (e.g. 123...1). So lets not allow such large numbers. */
1846 if (len
== TMPBUFLEN
- 1)
1849 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1852 if (tr
&& (len
< *size
))
1862 * proc_put_long - converts an integer to a decimal ASCII formatted string
1864 * @buf: the user buffer
1865 * @size: the size of the user buffer
1866 * @val: the integer to be converted
1867 * @neg: sign of the number, %TRUE for negative
1869 * In case of success %0 is returned and @buf and @size are updated with
1870 * the amount of bytes written.
1872 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1876 char tmp
[TMPBUFLEN
], *p
= tmp
;
1878 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1882 if (copy_to_user(*buf
, tmp
, len
))
1890 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1893 char __user
**buffer
= (char __user
**)buf
;
1894 if (put_user(c
, *buffer
))
1896 (*size
)--, (*buffer
)++;
1902 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1904 int write
, void *data
)
1907 *valp
= *negp
? -*lvalp
: *lvalp
;
1912 *lvalp
= (unsigned long)-val
;
1915 *lvalp
= (unsigned long)val
;
1921 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1923 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1924 int write
, void __user
*buffer
,
1925 size_t *lenp
, loff_t
*ppos
,
1926 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1927 int write
, void *data
),
1930 int *i
, vleft
, first
= 1, err
= 0;
1931 unsigned long page
= 0;
1935 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1940 i
= (int *) tbl_data
;
1941 vleft
= table
->maxlen
/ sizeof(*i
);
1945 conv
= do_proc_dointvec_conv
;
1948 if (left
> PAGE_SIZE
- 1)
1949 left
= PAGE_SIZE
- 1;
1950 page
= __get_free_page(GFP_TEMPORARY
);
1951 kbuf
= (char *) page
;
1954 if (copy_from_user(kbuf
, buffer
, left
)) {
1961 for (; left
&& vleft
--; i
++, first
=0) {
1966 left
-= proc_skip_spaces(&kbuf
);
1970 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1972 sizeof(proc_wspace_sep
), NULL
);
1975 if (conv(&neg
, &lval
, i
, 1, data
)) {
1980 if (conv(&neg
, &lval
, i
, 0, data
)) {
1985 err
= proc_put_char(&buffer
, &left
, '\t');
1988 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1994 if (!write
&& !first
&& left
&& !err
)
1995 err
= proc_put_char(&buffer
, &left
, '\n');
1996 if (write
&& !err
&& left
)
1997 left
-= proc_skip_spaces(&kbuf
);
2002 return err
? : -EINVAL
;
2009 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2010 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2011 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2012 int write
, void *data
),
2015 return __do_proc_dointvec(table
->data
, table
, write
,
2016 buffer
, lenp
, ppos
, conv
, data
);
2020 * proc_dointvec - read a vector of integers
2021 * @table: the sysctl table
2022 * @write: %TRUE if this is a write to the sysctl file
2023 * @buffer: the user buffer
2024 * @lenp: the size of the user buffer
2025 * @ppos: file position
2027 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2028 * values from/to the user buffer, treated as an ASCII string.
2030 * Returns 0 on success.
2032 int proc_dointvec(struct ctl_table
*table
, int write
,
2033 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2035 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2040 * Taint values can only be increased
2041 * This means we can safely use a temporary.
2043 static int proc_taint(struct ctl_table
*table
, int write
,
2044 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2047 unsigned long tmptaint
= get_taint();
2050 if (write
&& !capable(CAP_SYS_ADMIN
))
2055 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2061 * Poor man's atomic or. Not worth adding a primitive
2062 * to everyone's atomic.h for this
2065 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2066 if ((tmptaint
>> i
) & 1)
2067 add_taint(i
, LOCKDEP_STILL_OK
);
2074 #ifdef CONFIG_PRINTK
2075 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2076 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2078 if (write
&& !capable(CAP_SYS_ADMIN
))
2081 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2085 struct do_proc_dointvec_minmax_conv_param
{
2090 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2092 int write
, void *data
)
2094 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2096 int val
= *negp
? -*lvalp
: *lvalp
;
2097 if ((param
->min
&& *param
->min
> val
) ||
2098 (param
->max
&& *param
->max
< val
))
2105 *lvalp
= (unsigned long)-val
;
2108 *lvalp
= (unsigned long)val
;
2115 * proc_dointvec_minmax - read a vector of integers with min/max values
2116 * @table: the sysctl table
2117 * @write: %TRUE if this is a write to the sysctl file
2118 * @buffer: the user buffer
2119 * @lenp: the size of the user buffer
2120 * @ppos: file position
2122 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2123 * values from/to the user buffer, treated as an ASCII string.
2125 * This routine will ensure the values are within the range specified by
2126 * table->extra1 (min) and table->extra2 (max).
2128 * Returns 0 on success.
2130 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2131 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2133 struct do_proc_dointvec_minmax_conv_param param
= {
2134 .min
= (int *) table
->extra1
,
2135 .max
= (int *) table
->extra2
,
2137 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2138 do_proc_dointvec_minmax_conv
, ¶m
);
2141 static void validate_coredump_safety(void)
2143 #ifdef CONFIG_COREDUMP
2144 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2145 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2146 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2147 "suid_dumpable=2. Pipe handler or fully qualified "\
2148 "core dump path required.\n");
2153 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2154 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2156 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2158 validate_coredump_safety();
2162 #ifdef CONFIG_COREDUMP
2163 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2164 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2166 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2168 validate_coredump_safety();
2173 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2174 void __user
*buffer
,
2175 size_t *lenp
, loff_t
*ppos
,
2176 unsigned long convmul
,
2177 unsigned long convdiv
)
2179 unsigned long *i
, *min
, *max
;
2180 int vleft
, first
= 1, err
= 0;
2181 unsigned long page
= 0;
2185 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2190 i
= (unsigned long *) data
;
2191 min
= (unsigned long *) table
->extra1
;
2192 max
= (unsigned long *) table
->extra2
;
2193 vleft
= table
->maxlen
/ sizeof(unsigned long);
2197 if (left
> PAGE_SIZE
- 1)
2198 left
= PAGE_SIZE
- 1;
2199 page
= __get_free_page(GFP_TEMPORARY
);
2200 kbuf
= (char *) page
;
2203 if (copy_from_user(kbuf
, buffer
, left
)) {
2210 for (; left
&& vleft
--; i
++, first
= 0) {
2216 left
-= proc_skip_spaces(&kbuf
);
2218 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2220 sizeof(proc_wspace_sep
), NULL
);
2225 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2229 val
= convdiv
* (*i
) / convmul
;
2231 err
= proc_put_char(&buffer
, &left
, '\t');
2235 err
= proc_put_long(&buffer
, &left
, val
, false);
2241 if (!write
&& !first
&& left
&& !err
)
2242 err
= proc_put_char(&buffer
, &left
, '\n');
2244 left
-= proc_skip_spaces(&kbuf
);
2249 return err
? : -EINVAL
;
2256 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2257 void __user
*buffer
,
2258 size_t *lenp
, loff_t
*ppos
,
2259 unsigned long convmul
,
2260 unsigned long convdiv
)
2262 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2263 buffer
, lenp
, ppos
, convmul
, convdiv
);
2267 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2268 * @table: the sysctl table
2269 * @write: %TRUE if this is a write to the sysctl file
2270 * @buffer: the user buffer
2271 * @lenp: the size of the user buffer
2272 * @ppos: file position
2274 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2275 * values from/to the user buffer, treated as an ASCII string.
2277 * This routine will ensure the values are within the range specified by
2278 * table->extra1 (min) and table->extra2 (max).
2280 * Returns 0 on success.
2282 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2283 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2285 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2289 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2290 * @table: the sysctl table
2291 * @write: %TRUE if this is a write to the sysctl file
2292 * @buffer: the user buffer
2293 * @lenp: the size of the user buffer
2294 * @ppos: file position
2296 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2297 * values from/to the user buffer, treated as an ASCII string. The values
2298 * are treated as milliseconds, and converted to jiffies when they are stored.
2300 * This routine will ensure the values are within the range specified by
2301 * table->extra1 (min) and table->extra2 (max).
2303 * Returns 0 on success.
2305 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2306 void __user
*buffer
,
2307 size_t *lenp
, loff_t
*ppos
)
2309 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2310 lenp
, ppos
, HZ
, 1000l);
2314 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2316 int write
, void *data
)
2319 if (*lvalp
> LONG_MAX
/ HZ
)
2321 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2327 lval
= (unsigned long)-val
;
2330 lval
= (unsigned long)val
;
2337 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2339 int write
, void *data
)
2342 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2344 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2350 lval
= (unsigned long)-val
;
2353 lval
= (unsigned long)val
;
2355 *lvalp
= jiffies_to_clock_t(lval
);
2360 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2362 int write
, void *data
)
2365 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2375 lval
= (unsigned long)-val
;
2378 lval
= (unsigned long)val
;
2380 *lvalp
= jiffies_to_msecs(lval
);
2386 * proc_dointvec_jiffies - read a vector of integers as seconds
2387 * @table: the sysctl table
2388 * @write: %TRUE if this is a write to the sysctl file
2389 * @buffer: the user buffer
2390 * @lenp: the size of the user buffer
2391 * @ppos: file position
2393 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2394 * values from/to the user buffer, treated as an ASCII string.
2395 * The values read are assumed to be in seconds, and are converted into
2398 * Returns 0 on success.
2400 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2401 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2403 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2404 do_proc_dointvec_jiffies_conv
,NULL
);
2408 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2409 * @table: the sysctl table
2410 * @write: %TRUE if this is a write to the sysctl file
2411 * @buffer: the user buffer
2412 * @lenp: the size of the user buffer
2413 * @ppos: pointer to the file position
2415 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2416 * values from/to the user buffer, treated as an ASCII string.
2417 * The values read are assumed to be in 1/USER_HZ seconds, and
2418 * are converted into jiffies.
2420 * Returns 0 on success.
2422 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2423 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2425 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2426 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2430 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2431 * @table: the sysctl table
2432 * @write: %TRUE if this is a write to the sysctl file
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2436 * @ppos: the current position in the file
2438 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2439 * values from/to the user buffer, treated as an ASCII string.
2440 * The values read are assumed to be in 1/1000 seconds, and
2441 * are converted into jiffies.
2443 * Returns 0 on success.
2445 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2446 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2448 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2449 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2452 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2453 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2455 struct pid
*new_pid
;
2459 tmp
= pid_vnr(cad_pid
);
2461 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2462 lenp
, ppos
, NULL
, NULL
);
2466 new_pid
= find_get_pid(tmp
);
2470 put_pid(xchg(&cad_pid
, new_pid
));
2475 * proc_do_large_bitmap - read/write from/to a large bitmap
2476 * @table: the sysctl table
2477 * @write: %TRUE if this is a write to the sysctl file
2478 * @buffer: the user buffer
2479 * @lenp: the size of the user buffer
2480 * @ppos: file position
2482 * The bitmap is stored at table->data and the bitmap length (in bits)
2485 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2486 * large bitmaps may be represented in a compact manner. Writing into
2487 * the file will clear the bitmap then update it with the given input.
2489 * Returns 0 on success.
2491 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2492 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2496 size_t left
= *lenp
;
2497 unsigned long bitmap_len
= table
->maxlen
;
2498 unsigned long *bitmap
= (unsigned long *) table
->data
;
2499 unsigned long *tmp_bitmap
= NULL
;
2500 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2502 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2508 unsigned long page
= 0;
2511 if (left
> PAGE_SIZE
- 1)
2512 left
= PAGE_SIZE
- 1;
2514 page
= __get_free_page(GFP_TEMPORARY
);
2515 kbuf
= (char *) page
;
2518 if (copy_from_user(kbuf
, buffer
, left
)) {
2524 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2530 proc_skip_char(&kbuf
, &left
, '\n');
2531 while (!err
&& left
) {
2532 unsigned long val_a
, val_b
;
2535 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2539 if (val_a
>= bitmap_len
|| neg
) {
2551 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2552 &neg
, tr_b
, sizeof(tr_b
),
2556 if (val_b
>= bitmap_len
|| neg
||
2567 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2569 proc_skip_char(&kbuf
, &left
, '\n');
2573 unsigned long bit_a
, bit_b
= 0;
2576 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2577 if (bit_a
>= bitmap_len
)
2579 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2583 err
= proc_put_char(&buffer
, &left
, ',');
2587 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2590 if (bit_a
!= bit_b
) {
2591 err
= proc_put_char(&buffer
, &left
, '-');
2594 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2602 err
= proc_put_char(&buffer
, &left
, '\n');
2608 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2610 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2622 #else /* CONFIG_PROC_SYSCTL */
2624 int proc_dostring(struct ctl_table
*table
, int write
,
2625 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2630 int proc_dointvec(struct ctl_table
*table
, int write
,
2631 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2636 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2637 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2642 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2643 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2648 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2649 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2654 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2655 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2660 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2661 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2666 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2667 void __user
*buffer
,
2668 size_t *lenp
, loff_t
*ppos
)
2674 #endif /* CONFIG_PROC_SYSCTL */
2677 * No sense putting this after each symbol definition, twice,
2678 * exception granted :-)
2680 EXPORT_SYMBOL(proc_dointvec
);
2681 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2682 EXPORT_SYMBOL(proc_dointvec_minmax
);
2683 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2684 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2685 EXPORT_SYMBOL(proc_dostring
);
2686 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2687 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);