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>
34 #include <linux/init.h>
35 #include <linux/kernel.h>
36 #include <linux/kobject.h>
37 #include <linux/net.h>
38 #include <linux/sysrq.h>
39 #include <linux/highuid.h>
40 #include <linux/writeback.h>
41 #include <linux/ratelimit.h>
42 #include <linux/compaction.h>
43 #include <linux/hugetlb.h>
44 #include <linux/initrd.h>
45 #include <linux/key.h>
46 #include <linux/times.h>
47 #include <linux/limits.h>
48 #include <linux/dcache.h>
49 #include <linux/dnotify.h>
50 #include <linux/syscalls.h>
51 #include <linux/vmstat.h>
52 #include <linux/nfs_fs.h>
53 #include <linux/acpi.h>
54 #include <linux/reboot.h>
55 #include <linux/ftrace.h>
56 #include <linux/perf_event.h>
57 #include <linux/kprobes.h>
58 #include <linux/pipe_fs_i.h>
59 #include <linux/oom.h>
60 #include <linux/kmod.h>
61 #include <linux/capability.h>
62 #include <linux/binfmts.h>
64 #include <asm/uaccess.h>
65 #include <asm/processor.h>
69 #include <asm/stacktrace.h>
73 #include <asm/setup.h>
75 #ifdef CONFIG_BSD_PROCESS_ACCT
76 #include <linux/acct.h>
78 #ifdef CONFIG_RT_MUTEXES
79 #include <linux/rtmutex.h>
81 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
82 #include <linux/lockdep.h>
84 #ifdef CONFIG_CHR_DEV_SG
88 #ifdef CONFIG_LOCKUP_DETECTOR
89 #include <linux/nmi.h>
93 #if defined(CONFIG_SYSCTL)
95 /* External variables not in a header file. */
96 extern int sysctl_overcommit_memory
;
97 extern int sysctl_overcommit_ratio
;
98 extern int max_threads
;
99 extern int core_uses_pid
;
100 extern int suid_dumpable
;
101 extern char core_pattern
[];
102 extern unsigned int core_pipe_limit
;
104 extern int min_free_kbytes
;
105 extern int pid_max_min
, pid_max_max
;
106 extern int sysctl_drop_caches
;
107 extern int percpu_pagelist_fraction
;
108 extern int compat_log
;
109 extern int latencytop_enabled
;
110 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
112 extern int sysctl_nr_trim_pages
;
115 extern int blk_iopoll_enabled
;
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty
= 60;
121 static int neg_one
= -1;
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
;
157 extern int unaligned_enabled
;
161 extern int no_unaligned_warning
;
162 extern int unaligned_dump_stack
;
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
167 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
168 static int proc_taint(struct ctl_table
*table
, int write
,
169 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
173 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
174 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
177 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
178 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
179 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
180 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
182 #ifdef CONFIG_MAGIC_SYSRQ
183 /* Note: sysrq code uses it's own private copy */
184 static int __sysrq_enabled
= SYSRQ_DEFAULT_ENABLE
;
186 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
187 void __user
*buffer
, size_t *lenp
,
192 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
197 sysrq_toggle_support(__sysrq_enabled
);
204 static struct ctl_table kern_table
[];
205 static struct ctl_table vm_table
[];
206 static struct ctl_table fs_table
[];
207 static struct ctl_table debug_table
[];
208 static struct ctl_table dev_table
[];
209 extern struct ctl_table random_table
[];
211 extern struct ctl_table epoll_table
[];
214 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
215 int sysctl_legacy_va_layout
;
218 /* The default sysctl tables: */
220 static struct ctl_table sysctl_base_table
[] = {
222 .procname
= "kernel",
239 .child
= debug_table
,
249 #ifdef CONFIG_SCHED_DEBUG
250 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
251 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
252 static int min_wakeup_granularity_ns
; /* 0 usecs */
253 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
254 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
255 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
258 #ifdef CONFIG_COMPACTION
259 static int min_extfrag_threshold
;
260 static int max_extfrag_threshold
= 1000;
263 static struct ctl_table kern_table
[] = {
265 .procname
= "sched_child_runs_first",
266 .data
= &sysctl_sched_child_runs_first
,
267 .maxlen
= sizeof(unsigned int),
269 .proc_handler
= proc_dointvec
,
271 #ifdef CONFIG_SCHED_DEBUG
273 .procname
= "sched_min_granularity_ns",
274 .data
= &sysctl_sched_min_granularity
,
275 .maxlen
= sizeof(unsigned int),
277 .proc_handler
= sched_proc_update_handler
,
278 .extra1
= &min_sched_granularity_ns
,
279 .extra2
= &max_sched_granularity_ns
,
282 .procname
= "sched_latency_ns",
283 .data
= &sysctl_sched_latency
,
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_wakeup_granularity_ns",
292 .data
= &sysctl_sched_wakeup_granularity
,
293 .maxlen
= sizeof(unsigned int),
295 .proc_handler
= sched_proc_update_handler
,
296 .extra1
= &min_wakeup_granularity_ns
,
297 .extra2
= &max_wakeup_granularity_ns
,
300 .procname
= "sched_tunable_scaling",
301 .data
= &sysctl_sched_tunable_scaling
,
302 .maxlen
= sizeof(enum sched_tunable_scaling
),
304 .proc_handler
= sched_proc_update_handler
,
305 .extra1
= &min_sched_tunable_scaling
,
306 .extra2
= &max_sched_tunable_scaling
,
309 .procname
= "sched_migration_cost",
310 .data
= &sysctl_sched_migration_cost
,
311 .maxlen
= sizeof(unsigned int),
313 .proc_handler
= proc_dointvec
,
316 .procname
= "sched_nr_migrate",
317 .data
= &sysctl_sched_nr_migrate
,
318 .maxlen
= sizeof(unsigned int),
320 .proc_handler
= proc_dointvec
,
323 .procname
= "sched_time_avg",
324 .data
= &sysctl_sched_time_avg
,
325 .maxlen
= sizeof(unsigned int),
327 .proc_handler
= proc_dointvec
,
330 .procname
= "sched_shares_window",
331 .data
= &sysctl_sched_shares_window
,
332 .maxlen
= sizeof(unsigned int),
334 .proc_handler
= proc_dointvec
,
337 .procname
= "timer_migration",
338 .data
= &sysctl_timer_migration
,
339 .maxlen
= sizeof(unsigned int),
341 .proc_handler
= proc_dointvec_minmax
,
347 .procname
= "sched_rt_period_us",
348 .data
= &sysctl_sched_rt_period
,
349 .maxlen
= sizeof(unsigned int),
351 .proc_handler
= sched_rt_handler
,
354 .procname
= "sched_rt_runtime_us",
355 .data
= &sysctl_sched_rt_runtime
,
356 .maxlen
= sizeof(int),
358 .proc_handler
= sched_rt_handler
,
360 #ifdef CONFIG_SCHED_AUTOGROUP
362 .procname
= "sched_autogroup_enabled",
363 .data
= &sysctl_sched_autogroup_enabled
,
364 .maxlen
= sizeof(unsigned int),
366 .proc_handler
= proc_dointvec_minmax
,
371 #ifdef CONFIG_CFS_BANDWIDTH
373 .procname
= "sched_cfs_bandwidth_slice_us",
374 .data
= &sysctl_sched_cfs_bandwidth_slice
,
375 .maxlen
= sizeof(unsigned int),
377 .proc_handler
= proc_dointvec_minmax
,
381 #ifdef CONFIG_PROVE_LOCKING
383 .procname
= "prove_locking",
384 .data
= &prove_locking
,
385 .maxlen
= sizeof(int),
387 .proc_handler
= proc_dointvec
,
390 #ifdef CONFIG_LOCK_STAT
392 .procname
= "lock_stat",
394 .maxlen
= sizeof(int),
396 .proc_handler
= proc_dointvec
,
401 .data
= &panic_timeout
,
402 .maxlen
= sizeof(int),
404 .proc_handler
= proc_dointvec
,
407 .procname
= "core_uses_pid",
408 .data
= &core_uses_pid
,
409 .maxlen
= sizeof(int),
411 .proc_handler
= proc_dointvec
,
414 .procname
= "core_pattern",
415 .data
= core_pattern
,
416 .maxlen
= CORENAME_MAX_SIZE
,
418 .proc_handler
= proc_dostring_coredump
,
421 .procname
= "core_pipe_limit",
422 .data
= &core_pipe_limit
,
423 .maxlen
= sizeof(unsigned int),
425 .proc_handler
= proc_dointvec
,
427 #ifdef CONFIG_PROC_SYSCTL
429 .procname
= "tainted",
430 .maxlen
= sizeof(long),
432 .proc_handler
= proc_taint
,
435 #ifdef CONFIG_LATENCYTOP
437 .procname
= "latencytop",
438 .data
= &latencytop_enabled
,
439 .maxlen
= sizeof(int),
441 .proc_handler
= proc_dointvec
,
444 #ifdef CONFIG_BLK_DEV_INITRD
446 .procname
= "real-root-dev",
447 .data
= &real_root_dev
,
448 .maxlen
= sizeof(int),
450 .proc_handler
= proc_dointvec
,
454 .procname
= "print-fatal-signals",
455 .data
= &print_fatal_signals
,
456 .maxlen
= sizeof(int),
458 .proc_handler
= proc_dointvec
,
462 .procname
= "reboot-cmd",
463 .data
= reboot_command
,
466 .proc_handler
= proc_dostring
,
469 .procname
= "stop-a",
470 .data
= &stop_a_enabled
,
471 .maxlen
= sizeof (int),
473 .proc_handler
= proc_dointvec
,
476 .procname
= "scons-poweroff",
477 .data
= &scons_pwroff
,
478 .maxlen
= sizeof (int),
480 .proc_handler
= proc_dointvec
,
483 #ifdef CONFIG_SPARC64
485 .procname
= "tsb-ratio",
486 .data
= &sysctl_tsb_ratio
,
487 .maxlen
= sizeof (int),
489 .proc_handler
= proc_dointvec
,
494 .procname
= "soft-power",
495 .data
= &pwrsw_enabled
,
496 .maxlen
= sizeof (int),
498 .proc_handler
= proc_dointvec
,
501 .procname
= "unaligned-trap",
502 .data
= &unaligned_enabled
,
503 .maxlen
= sizeof (int),
505 .proc_handler
= proc_dointvec
,
509 .procname
= "ctrl-alt-del",
511 .maxlen
= sizeof(int),
513 .proc_handler
= proc_dointvec
,
515 #ifdef CONFIG_FUNCTION_TRACER
517 .procname
= "ftrace_enabled",
518 .data
= &ftrace_enabled
,
519 .maxlen
= sizeof(int),
521 .proc_handler
= ftrace_enable_sysctl
,
524 #ifdef CONFIG_STACK_TRACER
526 .procname
= "stack_tracer_enabled",
527 .data
= &stack_tracer_enabled
,
528 .maxlen
= sizeof(int),
530 .proc_handler
= stack_trace_sysctl
,
533 #ifdef CONFIG_TRACING
535 .procname
= "ftrace_dump_on_oops",
536 .data
= &ftrace_dump_on_oops
,
537 .maxlen
= sizeof(int),
539 .proc_handler
= proc_dointvec
,
542 #ifdef CONFIG_MODULES
544 .procname
= "modprobe",
545 .data
= &modprobe_path
,
546 .maxlen
= KMOD_PATH_LEN
,
548 .proc_handler
= proc_dostring
,
551 .procname
= "modules_disabled",
552 .data
= &modules_disabled
,
553 .maxlen
= sizeof(int),
555 /* only handle a transition from default "0" to "1" */
556 .proc_handler
= proc_dointvec_minmax
,
561 #ifdef CONFIG_HOTPLUG
563 .procname
= "hotplug",
564 .data
= &uevent_helper
,
565 .maxlen
= UEVENT_HELPER_PATH_LEN
,
567 .proc_handler
= proc_dostring
,
570 #ifdef CONFIG_CHR_DEV_SG
572 .procname
= "sg-big-buff",
573 .data
= &sg_big_buff
,
574 .maxlen
= sizeof (int),
576 .proc_handler
= proc_dointvec
,
579 #ifdef CONFIG_BSD_PROCESS_ACCT
583 .maxlen
= 3*sizeof(int),
585 .proc_handler
= proc_dointvec
,
588 #ifdef CONFIG_MAGIC_SYSRQ
591 .data
= &__sysrq_enabled
,
592 .maxlen
= sizeof (int),
594 .proc_handler
= sysrq_sysctl_handler
,
597 #ifdef CONFIG_PROC_SYSCTL
599 .procname
= "cad_pid",
601 .maxlen
= sizeof (int),
603 .proc_handler
= proc_do_cad_pid
,
607 .procname
= "threads-max",
608 .data
= &max_threads
,
609 .maxlen
= sizeof(int),
611 .proc_handler
= proc_dointvec
,
614 .procname
= "random",
616 .child
= random_table
,
619 .procname
= "usermodehelper",
621 .child
= usermodehelper_table
,
624 .procname
= "overflowuid",
625 .data
= &overflowuid
,
626 .maxlen
= sizeof(int),
628 .proc_handler
= proc_dointvec_minmax
,
629 .extra1
= &minolduid
,
630 .extra2
= &maxolduid
,
633 .procname
= "overflowgid",
634 .data
= &overflowgid
,
635 .maxlen
= sizeof(int),
637 .proc_handler
= proc_dointvec_minmax
,
638 .extra1
= &minolduid
,
639 .extra2
= &maxolduid
,
642 #ifdef CONFIG_MATHEMU
644 .procname
= "ieee_emulation_warnings",
645 .data
= &sysctl_ieee_emulation_warnings
,
646 .maxlen
= sizeof(int),
648 .proc_handler
= proc_dointvec
,
652 .procname
= "userprocess_debug",
653 .data
= &show_unhandled_signals
,
654 .maxlen
= sizeof(int),
656 .proc_handler
= proc_dointvec
,
660 .procname
= "pid_max",
662 .maxlen
= sizeof (int),
664 .proc_handler
= proc_dointvec_minmax
,
665 .extra1
= &pid_max_min
,
666 .extra2
= &pid_max_max
,
669 .procname
= "panic_on_oops",
670 .data
= &panic_on_oops
,
671 .maxlen
= sizeof(int),
673 .proc_handler
= proc_dointvec
,
675 #if defined CONFIG_PRINTK
677 .procname
= "printk",
678 .data
= &console_loglevel
,
679 .maxlen
= 4*sizeof(int),
681 .proc_handler
= proc_dointvec
,
684 .procname
= "printk_ratelimit",
685 .data
= &printk_ratelimit_state
.interval
,
686 .maxlen
= sizeof(int),
688 .proc_handler
= proc_dointvec_jiffies
,
691 .procname
= "printk_ratelimit_burst",
692 .data
= &printk_ratelimit_state
.burst
,
693 .maxlen
= sizeof(int),
695 .proc_handler
= proc_dointvec
,
698 .procname
= "printk_delay",
699 .data
= &printk_delay_msec
,
700 .maxlen
= sizeof(int),
702 .proc_handler
= proc_dointvec_minmax
,
704 .extra2
= &ten_thousand
,
707 .procname
= "dmesg_restrict",
708 .data
= &dmesg_restrict
,
709 .maxlen
= sizeof(int),
711 .proc_handler
= proc_dointvec_minmax_sysadmin
,
716 .procname
= "kptr_restrict",
717 .data
= &kptr_restrict
,
718 .maxlen
= sizeof(int),
720 .proc_handler
= proc_dointvec_minmax_sysadmin
,
726 .procname
= "ngroups_max",
727 .data
= &ngroups_max
,
728 .maxlen
= sizeof (int),
730 .proc_handler
= proc_dointvec
,
733 .procname
= "cap_last_cap",
734 .data
= (void *)&cap_last_cap
,
735 .maxlen
= sizeof(int),
737 .proc_handler
= proc_dointvec
,
739 #if defined(CONFIG_LOCKUP_DETECTOR)
741 .procname
= "watchdog",
742 .data
= &watchdog_enabled
,
743 .maxlen
= sizeof (int),
745 .proc_handler
= proc_dowatchdog
,
750 .procname
= "watchdog_thresh",
751 .data
= &watchdog_thresh
,
752 .maxlen
= sizeof(int),
754 .proc_handler
= proc_dowatchdog
,
759 .procname
= "softlockup_panic",
760 .data
= &softlockup_panic
,
761 .maxlen
= sizeof(int),
763 .proc_handler
= proc_dointvec_minmax
,
768 .procname
= "nmi_watchdog",
769 .data
= &watchdog_enabled
,
770 .maxlen
= sizeof (int),
772 .proc_handler
= proc_dowatchdog
,
777 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
779 .procname
= "unknown_nmi_panic",
780 .data
= &unknown_nmi_panic
,
781 .maxlen
= sizeof (int),
783 .proc_handler
= proc_dointvec
,
786 #if defined(CONFIG_X86)
788 .procname
= "panic_on_unrecovered_nmi",
789 .data
= &panic_on_unrecovered_nmi
,
790 .maxlen
= sizeof(int),
792 .proc_handler
= proc_dointvec
,
795 .procname
= "panic_on_io_nmi",
796 .data
= &panic_on_io_nmi
,
797 .maxlen
= sizeof(int),
799 .proc_handler
= proc_dointvec
,
801 #ifdef CONFIG_DEBUG_STACKOVERFLOW
803 .procname
= "panic_on_stackoverflow",
804 .data
= &sysctl_panic_on_stackoverflow
,
805 .maxlen
= sizeof(int),
807 .proc_handler
= proc_dointvec
,
811 .procname
= "bootloader_type",
812 .data
= &bootloader_type
,
813 .maxlen
= sizeof (int),
815 .proc_handler
= proc_dointvec
,
818 .procname
= "bootloader_version",
819 .data
= &bootloader_version
,
820 .maxlen
= sizeof (int),
822 .proc_handler
= proc_dointvec
,
825 .procname
= "kstack_depth_to_print",
826 .data
= &kstack_depth_to_print
,
827 .maxlen
= sizeof(int),
829 .proc_handler
= proc_dointvec
,
832 .procname
= "io_delay_type",
833 .data
= &io_delay_type
,
834 .maxlen
= sizeof(int),
836 .proc_handler
= proc_dointvec
,
839 #if defined(CONFIG_MMU)
841 .procname
= "randomize_va_space",
842 .data
= &randomize_va_space
,
843 .maxlen
= sizeof(int),
845 .proc_handler
= proc_dointvec
,
848 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
850 .procname
= "spin_retry",
852 .maxlen
= sizeof (int),
854 .proc_handler
= proc_dointvec
,
857 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
859 .procname
= "acpi_video_flags",
860 .data
= &acpi_realmode_flags
,
861 .maxlen
= sizeof (unsigned long),
863 .proc_handler
= proc_doulongvec_minmax
,
868 .procname
= "ignore-unaligned-usertrap",
869 .data
= &no_unaligned_warning
,
870 .maxlen
= sizeof (int),
872 .proc_handler
= proc_dointvec
,
875 .procname
= "unaligned-dump-stack",
876 .data
= &unaligned_dump_stack
,
877 .maxlen
= sizeof (int),
879 .proc_handler
= proc_dointvec
,
882 #ifdef CONFIG_DETECT_HUNG_TASK
884 .procname
= "hung_task_panic",
885 .data
= &sysctl_hung_task_panic
,
886 .maxlen
= sizeof(int),
888 .proc_handler
= proc_dointvec_minmax
,
893 .procname
= "hung_task_check_count",
894 .data
= &sysctl_hung_task_check_count
,
895 .maxlen
= sizeof(unsigned long),
897 .proc_handler
= proc_doulongvec_minmax
,
900 .procname
= "hung_task_timeout_secs",
901 .data
= &sysctl_hung_task_timeout_secs
,
902 .maxlen
= sizeof(unsigned long),
904 .proc_handler
= proc_dohung_task_timeout_secs
,
907 .procname
= "hung_task_warnings",
908 .data
= &sysctl_hung_task_warnings
,
909 .maxlen
= sizeof(unsigned long),
911 .proc_handler
= proc_doulongvec_minmax
,
916 .procname
= "compat-log",
918 .maxlen
= sizeof (int),
920 .proc_handler
= proc_dointvec
,
923 #ifdef CONFIG_RT_MUTEXES
925 .procname
= "max_lock_depth",
926 .data
= &max_lock_depth
,
927 .maxlen
= sizeof(int),
929 .proc_handler
= proc_dointvec
,
933 .procname
= "poweroff_cmd",
934 .data
= &poweroff_cmd
,
935 .maxlen
= POWEROFF_CMD_PATH_LEN
,
937 .proc_handler
= proc_dostring
,
943 .child
= key_sysctls
,
946 #ifdef CONFIG_RCU_TORTURE_TEST
948 .procname
= "rcutorture_runnable",
949 .data
= &rcutorture_runnable
,
950 .maxlen
= sizeof(int),
952 .proc_handler
= proc_dointvec
,
955 #ifdef CONFIG_PERF_EVENTS
957 * User-space scripts rely on the existence of this file
958 * as a feature check for perf_events being enabled.
960 * So it's an ABI, do not remove!
963 .procname
= "perf_event_paranoid",
964 .data
= &sysctl_perf_event_paranoid
,
965 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
967 .proc_handler
= proc_dointvec
,
970 .procname
= "perf_event_mlock_kb",
971 .data
= &sysctl_perf_event_mlock
,
972 .maxlen
= sizeof(sysctl_perf_event_mlock
),
974 .proc_handler
= proc_dointvec
,
977 .procname
= "perf_event_max_sample_rate",
978 .data
= &sysctl_perf_event_sample_rate
,
979 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
981 .proc_handler
= perf_proc_update_handler
,
984 #ifdef CONFIG_KMEMCHECK
986 .procname
= "kmemcheck",
987 .data
= &kmemcheck_enabled
,
988 .maxlen
= sizeof(int),
990 .proc_handler
= proc_dointvec
,
995 .procname
= "blk_iopoll",
996 .data
= &blk_iopoll_enabled
,
997 .maxlen
= sizeof(int),
999 .proc_handler
= proc_dointvec
,
1005 static struct ctl_table vm_table
[] = {
1007 .procname
= "overcommit_memory",
1008 .data
= &sysctl_overcommit_memory
,
1009 .maxlen
= sizeof(sysctl_overcommit_memory
),
1011 .proc_handler
= proc_dointvec_minmax
,
1016 .procname
= "panic_on_oom",
1017 .data
= &sysctl_panic_on_oom
,
1018 .maxlen
= sizeof(sysctl_panic_on_oom
),
1020 .proc_handler
= proc_dointvec_minmax
,
1025 .procname
= "oom_kill_allocating_task",
1026 .data
= &sysctl_oom_kill_allocating_task
,
1027 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1029 .proc_handler
= proc_dointvec
,
1032 .procname
= "oom_dump_tasks",
1033 .data
= &sysctl_oom_dump_tasks
,
1034 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1036 .proc_handler
= proc_dointvec
,
1039 .procname
= "overcommit_ratio",
1040 .data
= &sysctl_overcommit_ratio
,
1041 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1043 .proc_handler
= proc_dointvec
,
1046 .procname
= "page-cluster",
1047 .data
= &page_cluster
,
1048 .maxlen
= sizeof(int),
1050 .proc_handler
= proc_dointvec_minmax
,
1054 .procname
= "dirty_background_ratio",
1055 .data
= &dirty_background_ratio
,
1056 .maxlen
= sizeof(dirty_background_ratio
),
1058 .proc_handler
= dirty_background_ratio_handler
,
1060 .extra2
= &one_hundred
,
1063 .procname
= "dirty_background_bytes",
1064 .data
= &dirty_background_bytes
,
1065 .maxlen
= sizeof(dirty_background_bytes
),
1067 .proc_handler
= dirty_background_bytes_handler
,
1071 .procname
= "dirty_ratio",
1072 .data
= &vm_dirty_ratio
,
1073 .maxlen
= sizeof(vm_dirty_ratio
),
1075 .proc_handler
= dirty_ratio_handler
,
1077 .extra2
= &one_hundred
,
1080 .procname
= "dirty_bytes",
1081 .data
= &vm_dirty_bytes
,
1082 .maxlen
= sizeof(vm_dirty_bytes
),
1084 .proc_handler
= dirty_bytes_handler
,
1085 .extra1
= &dirty_bytes_min
,
1088 .procname
= "dirty_writeback_centisecs",
1089 .data
= &dirty_writeback_interval
,
1090 .maxlen
= sizeof(dirty_writeback_interval
),
1092 .proc_handler
= dirty_writeback_centisecs_handler
,
1095 .procname
= "dirty_expire_centisecs",
1096 .data
= &dirty_expire_interval
,
1097 .maxlen
= sizeof(dirty_expire_interval
),
1099 .proc_handler
= proc_dointvec_minmax
,
1103 .procname
= "nr_pdflush_threads",
1104 .data
= &nr_pdflush_threads
,
1105 .maxlen
= sizeof nr_pdflush_threads
,
1106 .mode
= 0444 /* read-only*/,
1107 .proc_handler
= proc_dointvec
,
1110 .procname
= "swappiness",
1111 .data
= &vm_swappiness
,
1112 .maxlen
= sizeof(vm_swappiness
),
1114 .proc_handler
= proc_dointvec_minmax
,
1116 .extra2
= &one_hundred
,
1118 #ifdef CONFIG_HUGETLB_PAGE
1120 .procname
= "nr_hugepages",
1122 .maxlen
= sizeof(unsigned long),
1124 .proc_handler
= hugetlb_sysctl_handler
,
1125 .extra1
= (void *)&hugetlb_zero
,
1126 .extra2
= (void *)&hugetlb_infinity
,
1130 .procname
= "nr_hugepages_mempolicy",
1132 .maxlen
= sizeof(unsigned long),
1134 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1135 .extra1
= (void *)&hugetlb_zero
,
1136 .extra2
= (void *)&hugetlb_infinity
,
1140 .procname
= "hugetlb_shm_group",
1141 .data
= &sysctl_hugetlb_shm_group
,
1142 .maxlen
= sizeof(gid_t
),
1144 .proc_handler
= proc_dointvec
,
1147 .procname
= "hugepages_treat_as_movable",
1148 .data
= &hugepages_treat_as_movable
,
1149 .maxlen
= sizeof(int),
1151 .proc_handler
= hugetlb_treat_movable_handler
,
1154 .procname
= "nr_overcommit_hugepages",
1156 .maxlen
= sizeof(unsigned long),
1158 .proc_handler
= hugetlb_overcommit_handler
,
1159 .extra1
= (void *)&hugetlb_zero
,
1160 .extra2
= (void *)&hugetlb_infinity
,
1164 .procname
= "lowmem_reserve_ratio",
1165 .data
= &sysctl_lowmem_reserve_ratio
,
1166 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1168 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1171 .procname
= "drop_caches",
1172 .data
= &sysctl_drop_caches
,
1173 .maxlen
= sizeof(int),
1175 .proc_handler
= drop_caches_sysctl_handler
,
1179 #ifdef CONFIG_COMPACTION
1181 .procname
= "compact_memory",
1182 .data
= &sysctl_compact_memory
,
1183 .maxlen
= sizeof(int),
1185 .proc_handler
= sysctl_compaction_handler
,
1188 .procname
= "extfrag_threshold",
1189 .data
= &sysctl_extfrag_threshold
,
1190 .maxlen
= sizeof(int),
1192 .proc_handler
= sysctl_extfrag_handler
,
1193 .extra1
= &min_extfrag_threshold
,
1194 .extra2
= &max_extfrag_threshold
,
1197 #endif /* CONFIG_COMPACTION */
1199 .procname
= "min_free_kbytes",
1200 .data
= &min_free_kbytes
,
1201 .maxlen
= sizeof(min_free_kbytes
),
1203 .proc_handler
= min_free_kbytes_sysctl_handler
,
1207 .procname
= "percpu_pagelist_fraction",
1208 .data
= &percpu_pagelist_fraction
,
1209 .maxlen
= sizeof(percpu_pagelist_fraction
),
1211 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1212 .extra1
= &min_percpu_pagelist_fract
,
1216 .procname
= "max_map_count",
1217 .data
= &sysctl_max_map_count
,
1218 .maxlen
= sizeof(sysctl_max_map_count
),
1220 .proc_handler
= proc_dointvec_minmax
,
1225 .procname
= "nr_trim_pages",
1226 .data
= &sysctl_nr_trim_pages
,
1227 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1229 .proc_handler
= proc_dointvec_minmax
,
1234 .procname
= "laptop_mode",
1235 .data
= &laptop_mode
,
1236 .maxlen
= sizeof(laptop_mode
),
1238 .proc_handler
= proc_dointvec_jiffies
,
1241 .procname
= "block_dump",
1242 .data
= &block_dump
,
1243 .maxlen
= sizeof(block_dump
),
1245 .proc_handler
= proc_dointvec
,
1249 .procname
= "vfs_cache_pressure",
1250 .data
= &sysctl_vfs_cache_pressure
,
1251 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1253 .proc_handler
= proc_dointvec
,
1256 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1258 .procname
= "legacy_va_layout",
1259 .data
= &sysctl_legacy_va_layout
,
1260 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1262 .proc_handler
= proc_dointvec
,
1268 .procname
= "zone_reclaim_mode",
1269 .data
= &zone_reclaim_mode
,
1270 .maxlen
= sizeof(zone_reclaim_mode
),
1272 .proc_handler
= proc_dointvec
,
1276 .procname
= "min_unmapped_ratio",
1277 .data
= &sysctl_min_unmapped_ratio
,
1278 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1280 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1282 .extra2
= &one_hundred
,
1285 .procname
= "min_slab_ratio",
1286 .data
= &sysctl_min_slab_ratio
,
1287 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1289 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1291 .extra2
= &one_hundred
,
1296 .procname
= "stat_interval",
1297 .data
= &sysctl_stat_interval
,
1298 .maxlen
= sizeof(sysctl_stat_interval
),
1300 .proc_handler
= proc_dointvec_jiffies
,
1305 .procname
= "mmap_min_addr",
1306 .data
= &dac_mmap_min_addr
,
1307 .maxlen
= sizeof(unsigned long),
1309 .proc_handler
= mmap_min_addr_handler
,
1314 .procname
= "numa_zonelist_order",
1315 .data
= &numa_zonelist_order
,
1316 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1318 .proc_handler
= numa_zonelist_order_handler
,
1321 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1322 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1324 .procname
= "vdso_enabled",
1325 .data
= &vdso_enabled
,
1326 .maxlen
= sizeof(vdso_enabled
),
1328 .proc_handler
= proc_dointvec
,
1332 #ifdef CONFIG_HIGHMEM
1334 .procname
= "highmem_is_dirtyable",
1335 .data
= &vm_highmem_is_dirtyable
,
1336 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1338 .proc_handler
= proc_dointvec_minmax
,
1344 .procname
= "scan_unevictable_pages",
1345 .data
= &scan_unevictable_pages
,
1346 .maxlen
= sizeof(scan_unevictable_pages
),
1348 .proc_handler
= scan_unevictable_handler
,
1350 #ifdef CONFIG_MEMORY_FAILURE
1352 .procname
= "memory_failure_early_kill",
1353 .data
= &sysctl_memory_failure_early_kill
,
1354 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1356 .proc_handler
= proc_dointvec_minmax
,
1361 .procname
= "memory_failure_recovery",
1362 .data
= &sysctl_memory_failure_recovery
,
1363 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1365 .proc_handler
= proc_dointvec_minmax
,
1373 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1374 static struct ctl_table binfmt_misc_table
[] = {
1379 static struct ctl_table fs_table
[] = {
1381 .procname
= "inode-nr",
1382 .data
= &inodes_stat
,
1383 .maxlen
= 2*sizeof(int),
1385 .proc_handler
= proc_nr_inodes
,
1388 .procname
= "inode-state",
1389 .data
= &inodes_stat
,
1390 .maxlen
= 7*sizeof(int),
1392 .proc_handler
= proc_nr_inodes
,
1395 .procname
= "file-nr",
1396 .data
= &files_stat
,
1397 .maxlen
= sizeof(files_stat
),
1399 .proc_handler
= proc_nr_files
,
1402 .procname
= "file-max",
1403 .data
= &files_stat
.max_files
,
1404 .maxlen
= sizeof(files_stat
.max_files
),
1406 .proc_handler
= proc_doulongvec_minmax
,
1409 .procname
= "nr_open",
1410 .data
= &sysctl_nr_open
,
1411 .maxlen
= sizeof(int),
1413 .proc_handler
= proc_dointvec_minmax
,
1414 .extra1
= &sysctl_nr_open_min
,
1415 .extra2
= &sysctl_nr_open_max
,
1418 .procname
= "dentry-state",
1419 .data
= &dentry_stat
,
1420 .maxlen
= 6*sizeof(int),
1422 .proc_handler
= proc_nr_dentry
,
1425 .procname
= "overflowuid",
1426 .data
= &fs_overflowuid
,
1427 .maxlen
= sizeof(int),
1429 .proc_handler
= proc_dointvec_minmax
,
1430 .extra1
= &minolduid
,
1431 .extra2
= &maxolduid
,
1434 .procname
= "overflowgid",
1435 .data
= &fs_overflowgid
,
1436 .maxlen
= sizeof(int),
1438 .proc_handler
= proc_dointvec_minmax
,
1439 .extra1
= &minolduid
,
1440 .extra2
= &maxolduid
,
1442 #ifdef CONFIG_FILE_LOCKING
1444 .procname
= "leases-enable",
1445 .data
= &leases_enable
,
1446 .maxlen
= sizeof(int),
1448 .proc_handler
= proc_dointvec
,
1451 #ifdef CONFIG_DNOTIFY
1453 .procname
= "dir-notify-enable",
1454 .data
= &dir_notify_enable
,
1455 .maxlen
= sizeof(int),
1457 .proc_handler
= proc_dointvec
,
1461 #ifdef CONFIG_FILE_LOCKING
1463 .procname
= "lease-break-time",
1464 .data
= &lease_break_time
,
1465 .maxlen
= sizeof(int),
1467 .proc_handler
= proc_dointvec
,
1472 .procname
= "aio-nr",
1474 .maxlen
= sizeof(aio_nr
),
1476 .proc_handler
= proc_doulongvec_minmax
,
1479 .procname
= "aio-max-nr",
1480 .data
= &aio_max_nr
,
1481 .maxlen
= sizeof(aio_max_nr
),
1483 .proc_handler
= proc_doulongvec_minmax
,
1485 #endif /* CONFIG_AIO */
1486 #ifdef CONFIG_INOTIFY_USER
1488 .procname
= "inotify",
1490 .child
= inotify_table
,
1495 .procname
= "epoll",
1497 .child
= epoll_table
,
1502 .procname
= "suid_dumpable",
1503 .data
= &suid_dumpable
,
1504 .maxlen
= sizeof(int),
1506 .proc_handler
= proc_dointvec_minmax_coredump
,
1510 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1512 .procname
= "binfmt_misc",
1514 .child
= binfmt_misc_table
,
1518 .procname
= "pipe-max-size",
1519 .data
= &pipe_max_size
,
1520 .maxlen
= sizeof(int),
1522 .proc_handler
= &pipe_proc_fn
,
1523 .extra1
= &pipe_min_size
,
1528 static struct ctl_table debug_table
[] = {
1529 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1530 defined(CONFIG_S390) || defined(CONFIG_TILE)
1532 .procname
= "exception-trace",
1533 .data
= &show_unhandled_signals
,
1534 .maxlen
= sizeof(int),
1536 .proc_handler
= proc_dointvec
1539 #if defined(CONFIG_OPTPROBES)
1541 .procname
= "kprobes-optimization",
1542 .data
= &sysctl_kprobes_optimization
,
1543 .maxlen
= sizeof(int),
1545 .proc_handler
= proc_kprobes_optimization_handler
,
1553 static struct ctl_table dev_table
[] = {
1557 int __init
sysctl_init(void)
1559 register_sysctl_table(sysctl_base_table
);
1563 #endif /* CONFIG_SYSCTL */
1569 #ifdef CONFIG_PROC_SYSCTL
1571 static int _proc_do_string(void* data
, int maxlen
, int write
,
1572 void __user
*buffer
,
1573 size_t *lenp
, loff_t
*ppos
)
1579 if (!data
|| !maxlen
|| !*lenp
) {
1587 while (len
< *lenp
) {
1588 if (get_user(c
, p
++))
1590 if (c
== 0 || c
== '\n')
1596 if(copy_from_user(data
, buffer
, len
))
1598 ((char *) data
)[len
] = 0;
1616 if(copy_to_user(buffer
, data
, len
))
1619 if(put_user('\n', ((char __user
*) buffer
) + len
))
1630 * proc_dostring - read a string sysctl
1631 * @table: the sysctl table
1632 * @write: %TRUE if this is a write to the sysctl file
1633 * @buffer: the user buffer
1634 * @lenp: the size of the user buffer
1635 * @ppos: file position
1637 * Reads/writes a string from/to the user buffer. If the kernel
1638 * buffer provided is not large enough to hold the string, the
1639 * string is truncated. The copied string is %NULL-terminated.
1640 * If the string is being read by the user process, it is copied
1641 * and a newline '\n' is added. It is truncated if the buffer is
1644 * Returns 0 on success.
1646 int proc_dostring(struct ctl_table
*table
, int write
,
1647 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1649 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1650 buffer
, lenp
, ppos
);
1653 static size_t proc_skip_spaces(char **buf
)
1656 char *tmp
= skip_spaces(*buf
);
1662 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1672 #define TMPBUFLEN 22
1674 * proc_get_long - reads an ASCII formatted integer from a user buffer
1676 * @buf: a kernel buffer
1677 * @size: size of the kernel buffer
1678 * @val: this is where the number will be stored
1679 * @neg: set to %TRUE if number is negative
1680 * @perm_tr: a vector which contains the allowed trailers
1681 * @perm_tr_len: size of the perm_tr vector
1682 * @tr: pointer to store the trailer character
1684 * In case of success %0 is returned and @buf and @size are updated with
1685 * the amount of bytes read. If @tr is non-NULL and a trailing
1686 * character exists (size is non-zero after returning from this
1687 * function), @tr is updated with the trailing character.
1689 static int proc_get_long(char **buf
, size_t *size
,
1690 unsigned long *val
, bool *neg
,
1691 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1694 char *p
, tmp
[TMPBUFLEN
];
1700 if (len
> TMPBUFLEN
- 1)
1701 len
= TMPBUFLEN
- 1;
1703 memcpy(tmp
, *buf
, len
);
1707 if (*p
== '-' && *size
> 1) {
1715 *val
= simple_strtoul(p
, &p
, 0);
1719 /* We don't know if the next char is whitespace thus we may accept
1720 * invalid integers (e.g. 1234...a) or two integers instead of one
1721 * (e.g. 123...1). So lets not allow such large numbers. */
1722 if (len
== TMPBUFLEN
- 1)
1725 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1728 if (tr
&& (len
< *size
))
1738 * proc_put_long - converts an integer to a decimal ASCII formatted string
1740 * @buf: the user buffer
1741 * @size: the size of the user buffer
1742 * @val: the integer to be converted
1743 * @neg: sign of the number, %TRUE for negative
1745 * In case of success %0 is returned and @buf and @size are updated with
1746 * the amount of bytes written.
1748 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1752 char tmp
[TMPBUFLEN
], *p
= tmp
;
1754 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1758 if (copy_to_user(*buf
, tmp
, len
))
1766 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1769 char __user
**buffer
= (char __user
**)buf
;
1770 if (put_user(c
, *buffer
))
1772 (*size
)--, (*buffer
)++;
1778 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1780 int write
, void *data
)
1783 *valp
= *negp
? -*lvalp
: *lvalp
;
1788 *lvalp
= (unsigned long)-val
;
1791 *lvalp
= (unsigned long)val
;
1797 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1799 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1800 int write
, void __user
*buffer
,
1801 size_t *lenp
, loff_t
*ppos
,
1802 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1803 int write
, void *data
),
1806 int *i
, vleft
, first
= 1, err
= 0;
1807 unsigned long page
= 0;
1811 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1816 i
= (int *) tbl_data
;
1817 vleft
= table
->maxlen
/ sizeof(*i
);
1821 conv
= do_proc_dointvec_conv
;
1824 if (left
> PAGE_SIZE
- 1)
1825 left
= PAGE_SIZE
- 1;
1826 page
= __get_free_page(GFP_TEMPORARY
);
1827 kbuf
= (char *) page
;
1830 if (copy_from_user(kbuf
, buffer
, left
)) {
1837 for (; left
&& vleft
--; i
++, first
=0) {
1842 left
-= proc_skip_spaces(&kbuf
);
1846 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1848 sizeof(proc_wspace_sep
), NULL
);
1851 if (conv(&neg
, &lval
, i
, 1, data
)) {
1856 if (conv(&neg
, &lval
, i
, 0, data
)) {
1861 err
= proc_put_char(&buffer
, &left
, '\t');
1864 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1870 if (!write
&& !first
&& left
&& !err
)
1871 err
= proc_put_char(&buffer
, &left
, '\n');
1872 if (write
&& !err
&& left
)
1873 left
-= proc_skip_spaces(&kbuf
);
1878 return err
? : -EINVAL
;
1885 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
1886 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1887 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1888 int write
, void *data
),
1891 return __do_proc_dointvec(table
->data
, table
, write
,
1892 buffer
, lenp
, ppos
, conv
, data
);
1896 * proc_dointvec - read a vector of integers
1897 * @table: the sysctl table
1898 * @write: %TRUE if this is a write to the sysctl file
1899 * @buffer: the user buffer
1900 * @lenp: the size of the user buffer
1901 * @ppos: file position
1903 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1904 * values from/to the user buffer, treated as an ASCII string.
1906 * Returns 0 on success.
1908 int proc_dointvec(struct ctl_table
*table
, int write
,
1909 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1911 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
1916 * Taint values can only be increased
1917 * This means we can safely use a temporary.
1919 static int proc_taint(struct ctl_table
*table
, int write
,
1920 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1923 unsigned long tmptaint
= get_taint();
1926 if (write
&& !capable(CAP_SYS_ADMIN
))
1931 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
1937 * Poor man's atomic or. Not worth adding a primitive
1938 * to everyone's atomic.h for this
1941 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
1942 if ((tmptaint
>> i
) & 1)
1950 #ifdef CONFIG_PRINTK
1951 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
1952 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1954 if (write
&& !capable(CAP_SYS_ADMIN
))
1957 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
1961 struct do_proc_dointvec_minmax_conv_param
{
1966 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
1968 int write
, void *data
)
1970 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1972 int val
= *negp
? -*lvalp
: *lvalp
;
1973 if ((param
->min
&& *param
->min
> val
) ||
1974 (param
->max
&& *param
->max
< val
))
1981 *lvalp
= (unsigned long)-val
;
1984 *lvalp
= (unsigned long)val
;
1991 * proc_dointvec_minmax - read a vector of integers with min/max values
1992 * @table: the sysctl table
1993 * @write: %TRUE if this is a write to the sysctl file
1994 * @buffer: the user buffer
1995 * @lenp: the size of the user buffer
1996 * @ppos: file position
1998 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1999 * values from/to the user buffer, treated as an ASCII string.
2001 * This routine will ensure the values are within the range specified by
2002 * table->extra1 (min) and table->extra2 (max).
2004 * Returns 0 on success.
2006 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2007 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2009 struct do_proc_dointvec_minmax_conv_param param
= {
2010 .min
= (int *) table
->extra1
,
2011 .max
= (int *) table
->extra2
,
2013 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2014 do_proc_dointvec_minmax_conv
, ¶m
);
2017 static void validate_coredump_safety(void)
2019 if (suid_dumpable
== SUID_DUMPABLE_SAFE
&&
2020 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2021 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2022 "suid_dumpable=2. Pipe handler or fully qualified "\
2023 "core dump path required.\n");
2027 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2028 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2030 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2032 validate_coredump_safety();
2036 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2037 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2039 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2041 validate_coredump_safety();
2045 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2046 void __user
*buffer
,
2047 size_t *lenp
, loff_t
*ppos
,
2048 unsigned long convmul
,
2049 unsigned long convdiv
)
2051 unsigned long *i
, *min
, *max
;
2052 int vleft
, first
= 1, err
= 0;
2053 unsigned long page
= 0;
2057 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2062 i
= (unsigned long *) data
;
2063 min
= (unsigned long *) table
->extra1
;
2064 max
= (unsigned long *) table
->extra2
;
2065 vleft
= table
->maxlen
/ sizeof(unsigned long);
2069 if (left
> PAGE_SIZE
- 1)
2070 left
= PAGE_SIZE
- 1;
2071 page
= __get_free_page(GFP_TEMPORARY
);
2072 kbuf
= (char *) page
;
2075 if (copy_from_user(kbuf
, buffer
, left
)) {
2082 for (; left
&& vleft
--; i
++, first
= 0) {
2088 left
-= proc_skip_spaces(&kbuf
);
2090 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2092 sizeof(proc_wspace_sep
), NULL
);
2097 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2101 val
= convdiv
* (*i
) / convmul
;
2103 err
= proc_put_char(&buffer
, &left
, '\t');
2104 err
= proc_put_long(&buffer
, &left
, val
, false);
2110 if (!write
&& !first
&& left
&& !err
)
2111 err
= proc_put_char(&buffer
, &left
, '\n');
2113 left
-= proc_skip_spaces(&kbuf
);
2118 return err
? : -EINVAL
;
2125 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2126 void __user
*buffer
,
2127 size_t *lenp
, loff_t
*ppos
,
2128 unsigned long convmul
,
2129 unsigned long convdiv
)
2131 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2132 buffer
, lenp
, ppos
, convmul
, convdiv
);
2136 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2137 * @table: the sysctl table
2138 * @write: %TRUE if this is a write to the sysctl file
2139 * @buffer: the user buffer
2140 * @lenp: the size of the user buffer
2141 * @ppos: file position
2143 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2144 * values from/to the user buffer, treated as an ASCII string.
2146 * This routine will ensure the values are within the range specified by
2147 * table->extra1 (min) and table->extra2 (max).
2149 * Returns 0 on success.
2151 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2152 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2154 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2158 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2159 * @table: the sysctl table
2160 * @write: %TRUE if this is a write to the sysctl file
2161 * @buffer: the user buffer
2162 * @lenp: the size of the user buffer
2163 * @ppos: file position
2165 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2166 * values from/to the user buffer, treated as an ASCII string. The values
2167 * are treated as milliseconds, and converted to jiffies when they are stored.
2169 * This routine will ensure the values are within the range specified by
2170 * table->extra1 (min) and table->extra2 (max).
2172 * Returns 0 on success.
2174 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2175 void __user
*buffer
,
2176 size_t *lenp
, loff_t
*ppos
)
2178 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2179 lenp
, ppos
, HZ
, 1000l);
2183 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2185 int write
, void *data
)
2188 if (*lvalp
> LONG_MAX
/ HZ
)
2190 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2196 lval
= (unsigned long)-val
;
2199 lval
= (unsigned long)val
;
2206 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2208 int write
, void *data
)
2211 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2213 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2219 lval
= (unsigned long)-val
;
2222 lval
= (unsigned long)val
;
2224 *lvalp
= jiffies_to_clock_t(lval
);
2229 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2231 int write
, void *data
)
2234 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2240 lval
= (unsigned long)-val
;
2243 lval
= (unsigned long)val
;
2245 *lvalp
= jiffies_to_msecs(lval
);
2251 * proc_dointvec_jiffies - read a vector of integers as seconds
2252 * @table: the sysctl table
2253 * @write: %TRUE if this is a write to the sysctl file
2254 * @buffer: the user buffer
2255 * @lenp: the size of the user buffer
2256 * @ppos: file position
2258 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2259 * values from/to the user buffer, treated as an ASCII string.
2260 * The values read are assumed to be in seconds, and are converted into
2263 * Returns 0 on success.
2265 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2266 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2268 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2269 do_proc_dointvec_jiffies_conv
,NULL
);
2273 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: pointer to the file position
2280 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2281 * values from/to the user buffer, treated as an ASCII string.
2282 * The values read are assumed to be in 1/USER_HZ seconds, and
2283 * are converted into jiffies.
2285 * Returns 0 on success.
2287 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2288 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2290 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2291 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2295 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2296 * @table: the sysctl table
2297 * @write: %TRUE if this is a write to the sysctl file
2298 * @buffer: the user buffer
2299 * @lenp: the size of the user buffer
2300 * @ppos: file position
2301 * @ppos: the current position in the file
2303 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2304 * values from/to the user buffer, treated as an ASCII string.
2305 * The values read are assumed to be in 1/1000 seconds, and
2306 * are converted into jiffies.
2308 * Returns 0 on success.
2310 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2311 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2313 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2314 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2317 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2318 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2320 struct pid
*new_pid
;
2324 tmp
= pid_vnr(cad_pid
);
2326 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2327 lenp
, ppos
, NULL
, NULL
);
2331 new_pid
= find_get_pid(tmp
);
2335 put_pid(xchg(&cad_pid
, new_pid
));
2340 * proc_do_large_bitmap - read/write from/to a large bitmap
2341 * @table: the sysctl table
2342 * @write: %TRUE if this is a write to the sysctl file
2343 * @buffer: the user buffer
2344 * @lenp: the size of the user buffer
2345 * @ppos: file position
2347 * The bitmap is stored at table->data and the bitmap length (in bits)
2350 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2351 * large bitmaps may be represented in a compact manner. Writing into
2352 * the file will clear the bitmap then update it with the given input.
2354 * Returns 0 on success.
2356 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2357 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2361 size_t left
= *lenp
;
2362 unsigned long bitmap_len
= table
->maxlen
;
2363 unsigned long *bitmap
= (unsigned long *) table
->data
;
2364 unsigned long *tmp_bitmap
= NULL
;
2365 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2367 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2373 unsigned long page
= 0;
2376 if (left
> PAGE_SIZE
- 1)
2377 left
= PAGE_SIZE
- 1;
2379 page
= __get_free_page(GFP_TEMPORARY
);
2380 kbuf
= (char *) page
;
2383 if (copy_from_user(kbuf
, buffer
, left
)) {
2389 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2395 proc_skip_char(&kbuf
, &left
, '\n');
2396 while (!err
&& left
) {
2397 unsigned long val_a
, val_b
;
2400 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2404 if (val_a
>= bitmap_len
|| neg
) {
2416 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2417 &neg
, tr_b
, sizeof(tr_b
),
2421 if (val_b
>= bitmap_len
|| neg
||
2432 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2434 proc_skip_char(&kbuf
, &left
, '\n');
2438 unsigned long bit_a
, bit_b
= 0;
2441 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2442 if (bit_a
>= bitmap_len
)
2444 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2448 err
= proc_put_char(&buffer
, &left
, ',');
2452 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2455 if (bit_a
!= bit_b
) {
2456 err
= proc_put_char(&buffer
, &left
, '-');
2459 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2467 err
= proc_put_char(&buffer
, &left
, '\n');
2473 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2475 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2487 #else /* CONFIG_PROC_SYSCTL */
2489 int proc_dostring(struct ctl_table
*table
, int write
,
2490 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2495 int proc_dointvec(struct ctl_table
*table
, int write
,
2496 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2501 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2502 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2507 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2508 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2513 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2514 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2519 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2520 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2525 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2526 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2531 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2532 void __user
*buffer
,
2533 size_t *lenp
, loff_t
*ppos
)
2539 #endif /* CONFIG_PROC_SYSCTL */
2542 * No sense putting this after each symbol definition, twice,
2543 * exception granted :-)
2545 EXPORT_SYMBOL(proc_dointvec
);
2546 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2547 EXPORT_SYMBOL(proc_dointvec_minmax
);
2548 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2549 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2550 EXPORT_SYMBOL(proc_dostring
);
2551 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2552 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);