2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
71 #include <asm/stacktrace.h>
75 #include <asm/setup.h>
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
86 #ifdef CONFIG_CHR_DEV_SG
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
95 #if defined(CONFIG_SYSCTL)
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory
;
99 extern int sysctl_overcommit_ratio
;
100 extern int max_threads
;
101 extern int suid_dumpable
;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid
;
104 extern char core_pattern
[];
105 extern unsigned int core_pipe_limit
;
108 extern int pid_max_min
, pid_max_max
;
109 extern int percpu_pagelist_fraction
;
110 extern int compat_log
;
111 extern int latencytop_enabled
;
112 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
114 extern int sysctl_nr_trim_pages
;
117 extern int blk_iopoll_enabled
;
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty
= 60;
126 static int __maybe_unused one
= 1;
127 static int __maybe_unused two
= 2;
128 static int __maybe_unused three
= 3;
129 static unsigned long one_ul
= 1;
130 static int one_hundred
= 100;
132 static int ten_thousand
= 10000;
135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
136 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
139 static int maxolduid
= 65535;
140 static int minolduid
;
141 static int min_percpu_pagelist_fract
= 8;
143 static int ngroups_max
= NGROUPS_MAX
;
144 static const int cap_last_cap
= CAP_LAST_CAP
;
146 #ifdef CONFIG_INOTIFY_USER
147 #include <linux/inotify.h>
152 #ifdef CONFIG_SPARC64
153 extern int sysctl_tsb_ratio
;
157 extern int pwrsw_enabled
;
160 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
161 extern int unaligned_enabled
;
165 extern int unaligned_dump_stack
;
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
169 extern int no_unaligned_warning
;
172 #ifdef CONFIG_PROC_SYSCTL
173 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
174 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
175 static int proc_taint(struct ctl_table
*table
, int write
,
176 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
180 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
181 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
184 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
185 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
186 #ifdef CONFIG_COREDUMP
187 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
188 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
191 #ifdef CONFIG_MAGIC_SYSRQ
192 /* Note: sysrq code uses it's own private copy */
193 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
195 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
196 void __user
*buffer
, size_t *lenp
,
201 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
206 sysrq_toggle_support(__sysrq_enabled
);
213 static struct ctl_table kern_table
[];
214 static struct ctl_table vm_table
[];
215 static struct ctl_table fs_table
[];
216 static struct ctl_table debug_table
[];
217 static struct ctl_table dev_table
[];
218 extern struct ctl_table random_table
[];
220 extern struct ctl_table epoll_table
[];
223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
224 int sysctl_legacy_va_layout
;
227 /* The default sysctl tables: */
229 static struct ctl_table sysctl_base_table
[] = {
231 .procname
= "kernel",
248 .child
= debug_table
,
258 #ifdef CONFIG_SCHED_DEBUG
259 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
260 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
261 static int min_wakeup_granularity_ns
; /* 0 usecs */
262 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
264 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
265 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
266 #endif /* CONFIG_SMP */
267 #endif /* CONFIG_SCHED_DEBUG */
269 #ifdef CONFIG_COMPACTION
270 static int min_extfrag_threshold
;
271 static int max_extfrag_threshold
= 1000;
274 static struct ctl_table kern_table
[] = {
276 .procname
= "sched_child_runs_first",
277 .data
= &sysctl_sched_child_runs_first
,
278 .maxlen
= sizeof(unsigned int),
280 .proc_handler
= proc_dointvec
,
282 #ifdef CONFIG_SCHED_DEBUG
284 .procname
= "sched_min_granularity_ns",
285 .data
= &sysctl_sched_min_granularity
,
286 .maxlen
= sizeof(unsigned int),
288 .proc_handler
= sched_proc_update_handler
,
289 .extra1
= &min_sched_granularity_ns
,
290 .extra2
= &max_sched_granularity_ns
,
293 .procname
= "sched_latency_ns",
294 .data
= &sysctl_sched_latency
,
295 .maxlen
= sizeof(unsigned int),
297 .proc_handler
= sched_proc_update_handler
,
298 .extra1
= &min_sched_granularity_ns
,
299 .extra2
= &max_sched_granularity_ns
,
302 .procname
= "sched_wakeup_granularity_ns",
303 .data
= &sysctl_sched_wakeup_granularity
,
304 .maxlen
= sizeof(unsigned int),
306 .proc_handler
= sched_proc_update_handler
,
307 .extra1
= &min_wakeup_granularity_ns
,
308 .extra2
= &max_wakeup_granularity_ns
,
312 .procname
= "sched_tunable_scaling",
313 .data
= &sysctl_sched_tunable_scaling
,
314 .maxlen
= sizeof(enum sched_tunable_scaling
),
316 .proc_handler
= sched_proc_update_handler
,
317 .extra1
= &min_sched_tunable_scaling
,
318 .extra2
= &max_sched_tunable_scaling
,
321 .procname
= "sched_migration_cost_ns",
322 .data
= &sysctl_sched_migration_cost
,
323 .maxlen
= sizeof(unsigned int),
325 .proc_handler
= proc_dointvec
,
328 .procname
= "sched_nr_migrate",
329 .data
= &sysctl_sched_nr_migrate
,
330 .maxlen
= sizeof(unsigned int),
332 .proc_handler
= proc_dointvec
,
335 .procname
= "sched_time_avg_ms",
336 .data
= &sysctl_sched_time_avg
,
337 .maxlen
= sizeof(unsigned int),
339 .proc_handler
= proc_dointvec
,
342 .procname
= "sched_shares_window_ns",
343 .data
= &sysctl_sched_shares_window
,
344 .maxlen
= sizeof(unsigned int),
346 .proc_handler
= proc_dointvec
,
349 .procname
= "timer_migration",
350 .data
= &sysctl_timer_migration
,
351 .maxlen
= sizeof(unsigned int),
353 .proc_handler
= proc_dointvec_minmax
,
357 #endif /* CONFIG_SMP */
358 #ifdef CONFIG_NUMA_BALANCING
360 .procname
= "numa_balancing_scan_delay_ms",
361 .data
= &sysctl_numa_balancing_scan_delay
,
362 .maxlen
= sizeof(unsigned int),
364 .proc_handler
= proc_dointvec
,
367 .procname
= "numa_balancing_scan_period_min_ms",
368 .data
= &sysctl_numa_balancing_scan_period_min
,
369 .maxlen
= sizeof(unsigned int),
371 .proc_handler
= proc_dointvec
,
374 .procname
= "numa_balancing_scan_period_max_ms",
375 .data
= &sysctl_numa_balancing_scan_period_max
,
376 .maxlen
= sizeof(unsigned int),
378 .proc_handler
= proc_dointvec
,
381 .procname
= "numa_balancing_scan_size_mb",
382 .data
= &sysctl_numa_balancing_scan_size
,
383 .maxlen
= sizeof(unsigned int),
385 .proc_handler
= proc_dointvec
,
388 .procname
= "numa_balancing_settle_count",
389 .data
= &sysctl_numa_balancing_settle_count
,
390 .maxlen
= sizeof(unsigned int),
392 .proc_handler
= proc_dointvec
,
395 .procname
= "numa_balancing_migrate_deferred",
396 .data
= &sysctl_numa_balancing_migrate_deferred
,
397 .maxlen
= sizeof(unsigned int),
399 .proc_handler
= proc_dointvec
,
401 #endif /* CONFIG_NUMA_BALANCING */
402 #endif /* CONFIG_SCHED_DEBUG */
404 .procname
= "sched_rt_period_us",
405 .data
= &sysctl_sched_rt_period
,
406 .maxlen
= sizeof(unsigned int),
408 .proc_handler
= sched_rt_handler
,
411 .procname
= "sched_rt_runtime_us",
412 .data
= &sysctl_sched_rt_runtime
,
413 .maxlen
= sizeof(int),
415 .proc_handler
= sched_rt_handler
,
418 .procname
= "sched_rr_timeslice_ms",
419 .data
= &sched_rr_timeslice
,
420 .maxlen
= sizeof(int),
422 .proc_handler
= sched_rr_handler
,
424 #ifdef CONFIG_SCHED_AUTOGROUP
426 .procname
= "sched_autogroup_enabled",
427 .data
= &sysctl_sched_autogroup_enabled
,
428 .maxlen
= sizeof(unsigned int),
430 .proc_handler
= proc_dointvec_minmax
,
435 #ifdef CONFIG_CFS_BANDWIDTH
437 .procname
= "sched_cfs_bandwidth_slice_us",
438 .data
= &sysctl_sched_cfs_bandwidth_slice
,
439 .maxlen
= sizeof(unsigned int),
441 .proc_handler
= proc_dointvec_minmax
,
445 #ifdef CONFIG_PROVE_LOCKING
447 .procname
= "prove_locking",
448 .data
= &prove_locking
,
449 .maxlen
= sizeof(int),
451 .proc_handler
= proc_dointvec
,
454 #ifdef CONFIG_LOCK_STAT
456 .procname
= "lock_stat",
458 .maxlen
= sizeof(int),
460 .proc_handler
= proc_dointvec
,
465 .data
= &panic_timeout
,
466 .maxlen
= sizeof(int),
468 .proc_handler
= proc_dointvec
,
470 #ifdef CONFIG_COREDUMP
472 .procname
= "core_uses_pid",
473 .data
= &core_uses_pid
,
474 .maxlen
= sizeof(int),
476 .proc_handler
= proc_dointvec
,
479 .procname
= "core_pattern",
480 .data
= core_pattern
,
481 .maxlen
= CORENAME_MAX_SIZE
,
483 .proc_handler
= proc_dostring_coredump
,
486 .procname
= "core_pipe_limit",
487 .data
= &core_pipe_limit
,
488 .maxlen
= sizeof(unsigned int),
490 .proc_handler
= proc_dointvec
,
493 #ifdef CONFIG_PROC_SYSCTL
495 .procname
= "tainted",
496 .maxlen
= sizeof(long),
498 .proc_handler
= proc_taint
,
501 #ifdef CONFIG_LATENCYTOP
503 .procname
= "latencytop",
504 .data
= &latencytop_enabled
,
505 .maxlen
= sizeof(int),
507 .proc_handler
= proc_dointvec
,
510 #ifdef CONFIG_BLK_DEV_INITRD
512 .procname
= "real-root-dev",
513 .data
= &real_root_dev
,
514 .maxlen
= sizeof(int),
516 .proc_handler
= proc_dointvec
,
520 .procname
= "print-fatal-signals",
521 .data
= &print_fatal_signals
,
522 .maxlen
= sizeof(int),
524 .proc_handler
= proc_dointvec
,
528 .procname
= "reboot-cmd",
529 .data
= reboot_command
,
532 .proc_handler
= proc_dostring
,
535 .procname
= "stop-a",
536 .data
= &stop_a_enabled
,
537 .maxlen
= sizeof (int),
539 .proc_handler
= proc_dointvec
,
542 .procname
= "scons-poweroff",
543 .data
= &scons_pwroff
,
544 .maxlen
= sizeof (int),
546 .proc_handler
= proc_dointvec
,
549 #ifdef CONFIG_SPARC64
551 .procname
= "tsb-ratio",
552 .data
= &sysctl_tsb_ratio
,
553 .maxlen
= sizeof (int),
555 .proc_handler
= proc_dointvec
,
560 .procname
= "soft-power",
561 .data
= &pwrsw_enabled
,
562 .maxlen
= sizeof (int),
564 .proc_handler
= proc_dointvec
,
567 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
569 .procname
= "unaligned-trap",
570 .data
= &unaligned_enabled
,
571 .maxlen
= sizeof (int),
573 .proc_handler
= proc_dointvec
,
577 .procname
= "ctrl-alt-del",
579 .maxlen
= sizeof(int),
581 .proc_handler
= proc_dointvec
,
583 #ifdef CONFIG_FUNCTION_TRACER
585 .procname
= "ftrace_enabled",
586 .data
= &ftrace_enabled
,
587 .maxlen
= sizeof(int),
589 .proc_handler
= ftrace_enable_sysctl
,
592 #ifdef CONFIG_STACK_TRACER
594 .procname
= "stack_tracer_enabled",
595 .data
= &stack_tracer_enabled
,
596 .maxlen
= sizeof(int),
598 .proc_handler
= stack_trace_sysctl
,
601 #ifdef CONFIG_TRACING
603 .procname
= "ftrace_dump_on_oops",
604 .data
= &ftrace_dump_on_oops
,
605 .maxlen
= sizeof(int),
607 .proc_handler
= proc_dointvec
,
610 .procname
= "traceoff_on_warning",
611 .data
= &__disable_trace_on_warning
,
612 .maxlen
= sizeof(__disable_trace_on_warning
),
614 .proc_handler
= proc_dointvec
,
617 #ifdef CONFIG_MODULES
619 .procname
= "modprobe",
620 .data
= &modprobe_path
,
621 .maxlen
= KMOD_PATH_LEN
,
623 .proc_handler
= proc_dostring
,
626 .procname
= "modules_disabled",
627 .data
= &modules_disabled
,
628 .maxlen
= sizeof(int),
630 /* only handle a transition from default "0" to "1" */
631 .proc_handler
= proc_dointvec_minmax
,
638 .procname
= "hotplug",
639 .data
= &uevent_helper
,
640 .maxlen
= UEVENT_HELPER_PATH_LEN
,
642 .proc_handler
= proc_dostring
,
645 #ifdef CONFIG_CHR_DEV_SG
647 .procname
= "sg-big-buff",
648 .data
= &sg_big_buff
,
649 .maxlen
= sizeof (int),
651 .proc_handler
= proc_dointvec
,
654 #ifdef CONFIG_BSD_PROCESS_ACCT
658 .maxlen
= 3*sizeof(int),
660 .proc_handler
= proc_dointvec
,
663 #ifdef CONFIG_MAGIC_SYSRQ
666 .data
= &__sysrq_enabled
,
667 .maxlen
= sizeof (int),
669 .proc_handler
= sysrq_sysctl_handler
,
672 #ifdef CONFIG_PROC_SYSCTL
674 .procname
= "cad_pid",
676 .maxlen
= sizeof (int),
678 .proc_handler
= proc_do_cad_pid
,
682 .procname
= "threads-max",
683 .data
= &max_threads
,
684 .maxlen
= sizeof(int),
686 .proc_handler
= proc_dointvec
,
689 .procname
= "random",
691 .child
= random_table
,
694 .procname
= "usermodehelper",
696 .child
= usermodehelper_table
,
699 .procname
= "overflowuid",
700 .data
= &overflowuid
,
701 .maxlen
= sizeof(int),
703 .proc_handler
= proc_dointvec_minmax
,
704 .extra1
= &minolduid
,
705 .extra2
= &maxolduid
,
708 .procname
= "overflowgid",
709 .data
= &overflowgid
,
710 .maxlen
= sizeof(int),
712 .proc_handler
= proc_dointvec_minmax
,
713 .extra1
= &minolduid
,
714 .extra2
= &maxolduid
,
717 #ifdef CONFIG_MATHEMU
719 .procname
= "ieee_emulation_warnings",
720 .data
= &sysctl_ieee_emulation_warnings
,
721 .maxlen
= sizeof(int),
723 .proc_handler
= proc_dointvec
,
727 .procname
= "userprocess_debug",
728 .data
= &show_unhandled_signals
,
729 .maxlen
= sizeof(int),
731 .proc_handler
= proc_dointvec
,
735 .procname
= "pid_max",
737 .maxlen
= sizeof (int),
739 .proc_handler
= proc_dointvec_minmax
,
740 .extra1
= &pid_max_min
,
741 .extra2
= &pid_max_max
,
744 .procname
= "panic_on_oops",
745 .data
= &panic_on_oops
,
746 .maxlen
= sizeof(int),
748 .proc_handler
= proc_dointvec
,
750 #if defined CONFIG_PRINTK
752 .procname
= "printk",
753 .data
= &console_loglevel
,
754 .maxlen
= 4*sizeof(int),
756 .proc_handler
= proc_dointvec
,
759 .procname
= "printk_ratelimit",
760 .data
= &printk_ratelimit_state
.interval
,
761 .maxlen
= sizeof(int),
763 .proc_handler
= proc_dointvec_jiffies
,
766 .procname
= "printk_ratelimit_burst",
767 .data
= &printk_ratelimit_state
.burst
,
768 .maxlen
= sizeof(int),
770 .proc_handler
= proc_dointvec
,
773 .procname
= "printk_delay",
774 .data
= &printk_delay_msec
,
775 .maxlen
= sizeof(int),
777 .proc_handler
= proc_dointvec_minmax
,
779 .extra2
= &ten_thousand
,
782 .procname
= "dmesg_restrict",
783 .data
= &dmesg_restrict
,
784 .maxlen
= sizeof(int),
786 .proc_handler
= proc_dointvec_minmax_sysadmin
,
791 .procname
= "kptr_restrict",
792 .data
= &kptr_restrict
,
793 .maxlen
= sizeof(int),
795 .proc_handler
= proc_dointvec_minmax_sysadmin
,
801 .procname
= "ngroups_max",
802 .data
= &ngroups_max
,
803 .maxlen
= sizeof (int),
805 .proc_handler
= proc_dointvec
,
808 .procname
= "cap_last_cap",
809 .data
= (void *)&cap_last_cap
,
810 .maxlen
= sizeof(int),
812 .proc_handler
= proc_dointvec
,
814 #if defined(CONFIG_LOCKUP_DETECTOR)
816 .procname
= "watchdog",
817 .data
= &watchdog_user_enabled
,
818 .maxlen
= sizeof (int),
820 .proc_handler
= proc_dowatchdog
,
825 .procname
= "watchdog_thresh",
826 .data
= &watchdog_thresh
,
827 .maxlen
= sizeof(int),
829 .proc_handler
= proc_dowatchdog
,
834 .procname
= "softlockup_panic",
835 .data
= &softlockup_panic
,
836 .maxlen
= sizeof(int),
838 .proc_handler
= proc_dointvec_minmax
,
843 .procname
= "nmi_watchdog",
844 .data
= &watchdog_user_enabled
,
845 .maxlen
= sizeof (int),
847 .proc_handler
= proc_dowatchdog
,
852 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
854 .procname
= "unknown_nmi_panic",
855 .data
= &unknown_nmi_panic
,
856 .maxlen
= sizeof (int),
858 .proc_handler
= proc_dointvec
,
861 #if defined(CONFIG_X86)
863 .procname
= "panic_on_unrecovered_nmi",
864 .data
= &panic_on_unrecovered_nmi
,
865 .maxlen
= sizeof(int),
867 .proc_handler
= proc_dointvec
,
870 .procname
= "panic_on_io_nmi",
871 .data
= &panic_on_io_nmi
,
872 .maxlen
= sizeof(int),
874 .proc_handler
= proc_dointvec
,
876 #ifdef CONFIG_DEBUG_STACKOVERFLOW
878 .procname
= "panic_on_stackoverflow",
879 .data
= &sysctl_panic_on_stackoverflow
,
880 .maxlen
= sizeof(int),
882 .proc_handler
= proc_dointvec
,
886 .procname
= "bootloader_type",
887 .data
= &bootloader_type
,
888 .maxlen
= sizeof (int),
890 .proc_handler
= proc_dointvec
,
893 .procname
= "bootloader_version",
894 .data
= &bootloader_version
,
895 .maxlen
= sizeof (int),
897 .proc_handler
= proc_dointvec
,
900 .procname
= "kstack_depth_to_print",
901 .data
= &kstack_depth_to_print
,
902 .maxlen
= sizeof(int),
904 .proc_handler
= proc_dointvec
,
907 .procname
= "io_delay_type",
908 .data
= &io_delay_type
,
909 .maxlen
= sizeof(int),
911 .proc_handler
= proc_dointvec
,
914 #if defined(CONFIG_MMU)
916 .procname
= "randomize_va_space",
917 .data
= &randomize_va_space
,
918 .maxlen
= sizeof(int),
920 .proc_handler
= proc_dointvec
,
923 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
925 .procname
= "spin_retry",
927 .maxlen
= sizeof (int),
929 .proc_handler
= proc_dointvec
,
932 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
934 .procname
= "acpi_video_flags",
935 .data
= &acpi_realmode_flags
,
936 .maxlen
= sizeof (unsigned long),
938 .proc_handler
= proc_doulongvec_minmax
,
941 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
943 .procname
= "ignore-unaligned-usertrap",
944 .data
= &no_unaligned_warning
,
945 .maxlen
= sizeof (int),
947 .proc_handler
= proc_dointvec
,
952 .procname
= "unaligned-dump-stack",
953 .data
= &unaligned_dump_stack
,
954 .maxlen
= sizeof (int),
956 .proc_handler
= proc_dointvec
,
959 #ifdef CONFIG_DETECT_HUNG_TASK
961 .procname
= "hung_task_panic",
962 .data
= &sysctl_hung_task_panic
,
963 .maxlen
= sizeof(int),
965 .proc_handler
= proc_dointvec_minmax
,
970 .procname
= "hung_task_check_count",
971 .data
= &sysctl_hung_task_check_count
,
972 .maxlen
= sizeof(unsigned long),
974 .proc_handler
= proc_doulongvec_minmax
,
977 .procname
= "hung_task_timeout_secs",
978 .data
= &sysctl_hung_task_timeout_secs
,
979 .maxlen
= sizeof(unsigned long),
981 .proc_handler
= proc_dohung_task_timeout_secs
,
984 .procname
= "hung_task_warnings",
985 .data
= &sysctl_hung_task_warnings
,
986 .maxlen
= sizeof(unsigned long),
988 .proc_handler
= proc_doulongvec_minmax
,
993 .procname
= "compat-log",
995 .maxlen
= sizeof (int),
997 .proc_handler
= proc_dointvec
,
1000 #ifdef CONFIG_RT_MUTEXES
1002 .procname
= "max_lock_depth",
1003 .data
= &max_lock_depth
,
1004 .maxlen
= sizeof(int),
1006 .proc_handler
= proc_dointvec
,
1010 .procname
= "poweroff_cmd",
1011 .data
= &poweroff_cmd
,
1012 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1014 .proc_handler
= proc_dostring
,
1020 .child
= key_sysctls
,
1023 #ifdef CONFIG_RCU_TORTURE_TEST
1025 .procname
= "rcutorture_runnable",
1026 .data
= &rcutorture_runnable
,
1027 .maxlen
= sizeof(int),
1029 .proc_handler
= proc_dointvec
,
1032 #ifdef CONFIG_PERF_EVENTS
1034 * User-space scripts rely on the existence of this file
1035 * as a feature check for perf_events being enabled.
1037 * So it's an ABI, do not remove!
1040 .procname
= "perf_event_paranoid",
1041 .data
= &sysctl_perf_event_paranoid
,
1042 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1044 .proc_handler
= proc_dointvec
,
1047 .procname
= "perf_event_mlock_kb",
1048 .data
= &sysctl_perf_event_mlock
,
1049 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1051 .proc_handler
= proc_dointvec
,
1054 .procname
= "perf_event_max_sample_rate",
1055 .data
= &sysctl_perf_event_sample_rate
,
1056 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1058 .proc_handler
= perf_proc_update_handler
,
1062 .procname
= "perf_cpu_time_max_percent",
1063 .data
= &sysctl_perf_cpu_time_max_percent
,
1064 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1066 .proc_handler
= perf_cpu_time_max_percent_handler
,
1068 .extra2
= &one_hundred
,
1071 #ifdef CONFIG_KMEMCHECK
1073 .procname
= "kmemcheck",
1074 .data
= &kmemcheck_enabled
,
1075 .maxlen
= sizeof(int),
1077 .proc_handler
= proc_dointvec
,
1082 .procname
= "blk_iopoll",
1083 .data
= &blk_iopoll_enabled
,
1084 .maxlen
= sizeof(int),
1086 .proc_handler
= proc_dointvec
,
1092 static struct ctl_table vm_table
[] = {
1094 .procname
= "overcommit_memory",
1095 .data
= &sysctl_overcommit_memory
,
1096 .maxlen
= sizeof(sysctl_overcommit_memory
),
1098 .proc_handler
= proc_dointvec_minmax
,
1103 .procname
= "panic_on_oom",
1104 .data
= &sysctl_panic_on_oom
,
1105 .maxlen
= sizeof(sysctl_panic_on_oom
),
1107 .proc_handler
= proc_dointvec_minmax
,
1112 .procname
= "oom_kill_allocating_task",
1113 .data
= &sysctl_oom_kill_allocating_task
,
1114 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1116 .proc_handler
= proc_dointvec
,
1119 .procname
= "oom_dump_tasks",
1120 .data
= &sysctl_oom_dump_tasks
,
1121 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1123 .proc_handler
= proc_dointvec
,
1126 .procname
= "overcommit_ratio",
1127 .data
= &sysctl_overcommit_ratio
,
1128 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1130 .proc_handler
= proc_dointvec
,
1133 .procname
= "page-cluster",
1134 .data
= &page_cluster
,
1135 .maxlen
= sizeof(int),
1137 .proc_handler
= proc_dointvec_minmax
,
1141 .procname
= "dirty_background_ratio",
1142 .data
= &dirty_background_ratio
,
1143 .maxlen
= sizeof(dirty_background_ratio
),
1145 .proc_handler
= dirty_background_ratio_handler
,
1147 .extra2
= &one_hundred
,
1150 .procname
= "dirty_background_bytes",
1151 .data
= &dirty_background_bytes
,
1152 .maxlen
= sizeof(dirty_background_bytes
),
1154 .proc_handler
= dirty_background_bytes_handler
,
1158 .procname
= "dirty_ratio",
1159 .data
= &vm_dirty_ratio
,
1160 .maxlen
= sizeof(vm_dirty_ratio
),
1162 .proc_handler
= dirty_ratio_handler
,
1164 .extra2
= &one_hundred
,
1167 .procname
= "dirty_bytes",
1168 .data
= &vm_dirty_bytes
,
1169 .maxlen
= sizeof(vm_dirty_bytes
),
1171 .proc_handler
= dirty_bytes_handler
,
1172 .extra1
= &dirty_bytes_min
,
1175 .procname
= "dirty_writeback_centisecs",
1176 .data
= &dirty_writeback_interval
,
1177 .maxlen
= sizeof(dirty_writeback_interval
),
1179 .proc_handler
= dirty_writeback_centisecs_handler
,
1182 .procname
= "dirty_expire_centisecs",
1183 .data
= &dirty_expire_interval
,
1184 .maxlen
= sizeof(dirty_expire_interval
),
1186 .proc_handler
= proc_dointvec_minmax
,
1190 .procname
= "nr_pdflush_threads",
1191 .mode
= 0444 /* read-only */,
1192 .proc_handler
= pdflush_proc_obsolete
,
1195 .procname
= "swappiness",
1196 .data
= &vm_swappiness
,
1197 .maxlen
= sizeof(vm_swappiness
),
1199 .proc_handler
= proc_dointvec_minmax
,
1201 .extra2
= &one_hundred
,
1203 #ifdef CONFIG_HUGETLB_PAGE
1205 .procname
= "nr_hugepages",
1207 .maxlen
= sizeof(unsigned long),
1209 .proc_handler
= hugetlb_sysctl_handler
,
1210 .extra1
= (void *)&hugetlb_zero
,
1211 .extra2
= (void *)&hugetlb_infinity
,
1215 .procname
= "nr_hugepages_mempolicy",
1217 .maxlen
= sizeof(unsigned long),
1219 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1220 .extra1
= (void *)&hugetlb_zero
,
1221 .extra2
= (void *)&hugetlb_infinity
,
1225 .procname
= "hugetlb_shm_group",
1226 .data
= &sysctl_hugetlb_shm_group
,
1227 .maxlen
= sizeof(gid_t
),
1229 .proc_handler
= proc_dointvec
,
1232 .procname
= "hugepages_treat_as_movable",
1233 .data
= &hugepages_treat_as_movable
,
1234 .maxlen
= sizeof(int),
1236 .proc_handler
= proc_dointvec
,
1239 .procname
= "nr_overcommit_hugepages",
1241 .maxlen
= sizeof(unsigned long),
1243 .proc_handler
= hugetlb_overcommit_handler
,
1244 .extra1
= (void *)&hugetlb_zero
,
1245 .extra2
= (void *)&hugetlb_infinity
,
1249 .procname
= "lowmem_reserve_ratio",
1250 .data
= &sysctl_lowmem_reserve_ratio
,
1251 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1253 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1256 .procname
= "drop_caches",
1257 .data
= &sysctl_drop_caches
,
1258 .maxlen
= sizeof(int),
1260 .proc_handler
= drop_caches_sysctl_handler
,
1264 #ifdef CONFIG_COMPACTION
1266 .procname
= "compact_memory",
1267 .data
= &sysctl_compact_memory
,
1268 .maxlen
= sizeof(int),
1270 .proc_handler
= sysctl_compaction_handler
,
1273 .procname
= "extfrag_threshold",
1274 .data
= &sysctl_extfrag_threshold
,
1275 .maxlen
= sizeof(int),
1277 .proc_handler
= sysctl_extfrag_handler
,
1278 .extra1
= &min_extfrag_threshold
,
1279 .extra2
= &max_extfrag_threshold
,
1282 #endif /* CONFIG_COMPACTION */
1284 .procname
= "min_free_kbytes",
1285 .data
= &min_free_kbytes
,
1286 .maxlen
= sizeof(min_free_kbytes
),
1288 .proc_handler
= min_free_kbytes_sysctl_handler
,
1292 .procname
= "percpu_pagelist_fraction",
1293 .data
= &percpu_pagelist_fraction
,
1294 .maxlen
= sizeof(percpu_pagelist_fraction
),
1296 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1297 .extra1
= &min_percpu_pagelist_fract
,
1301 .procname
= "max_map_count",
1302 .data
= &sysctl_max_map_count
,
1303 .maxlen
= sizeof(sysctl_max_map_count
),
1305 .proc_handler
= proc_dointvec_minmax
,
1310 .procname
= "nr_trim_pages",
1311 .data
= &sysctl_nr_trim_pages
,
1312 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1314 .proc_handler
= proc_dointvec_minmax
,
1319 .procname
= "laptop_mode",
1320 .data
= &laptop_mode
,
1321 .maxlen
= sizeof(laptop_mode
),
1323 .proc_handler
= proc_dointvec_jiffies
,
1326 .procname
= "block_dump",
1327 .data
= &block_dump
,
1328 .maxlen
= sizeof(block_dump
),
1330 .proc_handler
= proc_dointvec
,
1334 .procname
= "vfs_cache_pressure",
1335 .data
= &sysctl_vfs_cache_pressure
,
1336 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1338 .proc_handler
= proc_dointvec
,
1341 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1343 .procname
= "legacy_va_layout",
1344 .data
= &sysctl_legacy_va_layout
,
1345 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1347 .proc_handler
= proc_dointvec
,
1353 .procname
= "zone_reclaim_mode",
1354 .data
= &zone_reclaim_mode
,
1355 .maxlen
= sizeof(zone_reclaim_mode
),
1357 .proc_handler
= proc_dointvec
,
1361 .procname
= "min_unmapped_ratio",
1362 .data
= &sysctl_min_unmapped_ratio
,
1363 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1365 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1367 .extra2
= &one_hundred
,
1370 .procname
= "min_slab_ratio",
1371 .data
= &sysctl_min_slab_ratio
,
1372 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1374 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1376 .extra2
= &one_hundred
,
1381 .procname
= "stat_interval",
1382 .data
= &sysctl_stat_interval
,
1383 .maxlen
= sizeof(sysctl_stat_interval
),
1385 .proc_handler
= proc_dointvec_jiffies
,
1390 .procname
= "mmap_min_addr",
1391 .data
= &dac_mmap_min_addr
,
1392 .maxlen
= sizeof(unsigned long),
1394 .proc_handler
= mmap_min_addr_handler
,
1399 .procname
= "numa_zonelist_order",
1400 .data
= &numa_zonelist_order
,
1401 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1403 .proc_handler
= numa_zonelist_order_handler
,
1406 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1407 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1409 .procname
= "vdso_enabled",
1410 .data
= &vdso_enabled
,
1411 .maxlen
= sizeof(vdso_enabled
),
1413 .proc_handler
= proc_dointvec
,
1417 #ifdef CONFIG_HIGHMEM
1419 .procname
= "highmem_is_dirtyable",
1420 .data
= &vm_highmem_is_dirtyable
,
1421 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1423 .proc_handler
= proc_dointvec_minmax
,
1429 .procname
= "scan_unevictable_pages",
1430 .data
= &scan_unevictable_pages
,
1431 .maxlen
= sizeof(scan_unevictable_pages
),
1433 .proc_handler
= scan_unevictable_handler
,
1435 #ifdef CONFIG_MEMORY_FAILURE
1437 .procname
= "memory_failure_early_kill",
1438 .data
= &sysctl_memory_failure_early_kill
,
1439 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1441 .proc_handler
= proc_dointvec_minmax
,
1446 .procname
= "memory_failure_recovery",
1447 .data
= &sysctl_memory_failure_recovery
,
1448 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1450 .proc_handler
= proc_dointvec_minmax
,
1456 .procname
= "user_reserve_kbytes",
1457 .data
= &sysctl_user_reserve_kbytes
,
1458 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1460 .proc_handler
= proc_doulongvec_minmax
,
1463 .procname
= "admin_reserve_kbytes",
1464 .data
= &sysctl_admin_reserve_kbytes
,
1465 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1467 .proc_handler
= proc_doulongvec_minmax
,
1472 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1473 static struct ctl_table binfmt_misc_table
[] = {
1478 static struct ctl_table fs_table
[] = {
1480 .procname
= "inode-nr",
1481 .data
= &inodes_stat
,
1482 .maxlen
= 2*sizeof(long),
1484 .proc_handler
= proc_nr_inodes
,
1487 .procname
= "inode-state",
1488 .data
= &inodes_stat
,
1489 .maxlen
= 7*sizeof(long),
1491 .proc_handler
= proc_nr_inodes
,
1494 .procname
= "file-nr",
1495 .data
= &files_stat
,
1496 .maxlen
= sizeof(files_stat
),
1498 .proc_handler
= proc_nr_files
,
1501 .procname
= "file-max",
1502 .data
= &files_stat
.max_files
,
1503 .maxlen
= sizeof(files_stat
.max_files
),
1505 .proc_handler
= proc_doulongvec_minmax
,
1508 .procname
= "nr_open",
1509 .data
= &sysctl_nr_open
,
1510 .maxlen
= sizeof(int),
1512 .proc_handler
= proc_dointvec_minmax
,
1513 .extra1
= &sysctl_nr_open_min
,
1514 .extra2
= &sysctl_nr_open_max
,
1517 .procname
= "dentry-state",
1518 .data
= &dentry_stat
,
1519 .maxlen
= 6*sizeof(long),
1521 .proc_handler
= proc_nr_dentry
,
1524 .procname
= "overflowuid",
1525 .data
= &fs_overflowuid
,
1526 .maxlen
= sizeof(int),
1528 .proc_handler
= proc_dointvec_minmax
,
1529 .extra1
= &minolduid
,
1530 .extra2
= &maxolduid
,
1533 .procname
= "overflowgid",
1534 .data
= &fs_overflowgid
,
1535 .maxlen
= sizeof(int),
1537 .proc_handler
= proc_dointvec_minmax
,
1538 .extra1
= &minolduid
,
1539 .extra2
= &maxolduid
,
1541 #ifdef CONFIG_FILE_LOCKING
1543 .procname
= "leases-enable",
1544 .data
= &leases_enable
,
1545 .maxlen
= sizeof(int),
1547 .proc_handler
= proc_dointvec
,
1550 #ifdef CONFIG_DNOTIFY
1552 .procname
= "dir-notify-enable",
1553 .data
= &dir_notify_enable
,
1554 .maxlen
= sizeof(int),
1556 .proc_handler
= proc_dointvec
,
1560 #ifdef CONFIG_FILE_LOCKING
1562 .procname
= "lease-break-time",
1563 .data
= &lease_break_time
,
1564 .maxlen
= sizeof(int),
1566 .proc_handler
= proc_dointvec
,
1571 .procname
= "aio-nr",
1573 .maxlen
= sizeof(aio_nr
),
1575 .proc_handler
= proc_doulongvec_minmax
,
1578 .procname
= "aio-max-nr",
1579 .data
= &aio_max_nr
,
1580 .maxlen
= sizeof(aio_max_nr
),
1582 .proc_handler
= proc_doulongvec_minmax
,
1584 #endif /* CONFIG_AIO */
1585 #ifdef CONFIG_INOTIFY_USER
1587 .procname
= "inotify",
1589 .child
= inotify_table
,
1594 .procname
= "epoll",
1596 .child
= epoll_table
,
1601 .procname
= "protected_symlinks",
1602 .data
= &sysctl_protected_symlinks
,
1603 .maxlen
= sizeof(int),
1605 .proc_handler
= proc_dointvec_minmax
,
1610 .procname
= "protected_hardlinks",
1611 .data
= &sysctl_protected_hardlinks
,
1612 .maxlen
= sizeof(int),
1614 .proc_handler
= proc_dointvec_minmax
,
1619 .procname
= "suid_dumpable",
1620 .data
= &suid_dumpable
,
1621 .maxlen
= sizeof(int),
1623 .proc_handler
= proc_dointvec_minmax_coredump
,
1627 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1629 .procname
= "binfmt_misc",
1631 .child
= binfmt_misc_table
,
1635 .procname
= "pipe-max-size",
1636 .data
= &pipe_max_size
,
1637 .maxlen
= sizeof(int),
1639 .proc_handler
= &pipe_proc_fn
,
1640 .extra1
= &pipe_min_size
,
1645 static struct ctl_table debug_table
[] = {
1646 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1648 .procname
= "exception-trace",
1649 .data
= &show_unhandled_signals
,
1650 .maxlen
= sizeof(int),
1652 .proc_handler
= proc_dointvec
1655 #if defined(CONFIG_OPTPROBES)
1657 .procname
= "kprobes-optimization",
1658 .data
= &sysctl_kprobes_optimization
,
1659 .maxlen
= sizeof(int),
1661 .proc_handler
= proc_kprobes_optimization_handler
,
1669 static struct ctl_table dev_table
[] = {
1673 int __init
sysctl_init(void)
1675 struct ctl_table_header
*hdr
;
1677 hdr
= register_sysctl_table(sysctl_base_table
);
1678 kmemleak_not_leak(hdr
);
1682 #endif /* CONFIG_SYSCTL */
1688 #ifdef CONFIG_PROC_SYSCTL
1690 static int _proc_do_string(void* data
, int maxlen
, int write
,
1691 void __user
*buffer
,
1692 size_t *lenp
, loff_t
*ppos
)
1698 if (!data
|| !maxlen
|| !*lenp
) {
1706 while (len
< *lenp
) {
1707 if (get_user(c
, p
++))
1709 if (c
== 0 || c
== '\n')
1715 if(copy_from_user(data
, buffer
, len
))
1717 ((char *) data
)[len
] = 0;
1735 if(copy_to_user(buffer
, data
, len
))
1738 if(put_user('\n', ((char __user
*) buffer
) + len
))
1749 * proc_dostring - read a string sysctl
1750 * @table: the sysctl table
1751 * @write: %TRUE if this is a write to the sysctl file
1752 * @buffer: the user buffer
1753 * @lenp: the size of the user buffer
1754 * @ppos: file position
1756 * Reads/writes a string from/to the user buffer. If the kernel
1757 * buffer provided is not large enough to hold the string, the
1758 * string is truncated. The copied string is %NULL-terminated.
1759 * If the string is being read by the user process, it is copied
1760 * and a newline '\n' is added. It is truncated if the buffer is
1763 * Returns 0 on success.
1765 int proc_dostring(struct ctl_table
*table
, int write
,
1766 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1768 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1769 buffer
, lenp
, ppos
);
1772 static size_t proc_skip_spaces(char **buf
)
1775 char *tmp
= skip_spaces(*buf
);
1781 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1791 #define TMPBUFLEN 22
1793 * proc_get_long - reads an ASCII formatted integer from a user buffer
1795 * @buf: a kernel buffer
1796 * @size: size of the kernel buffer
1797 * @val: this is where the number will be stored
1798 * @neg: set to %TRUE if number is negative
1799 * @perm_tr: a vector which contains the allowed trailers
1800 * @perm_tr_len: size of the perm_tr vector
1801 * @tr: pointer to store the trailer character
1803 * In case of success %0 is returned and @buf and @size are updated with
1804 * the amount of bytes read. If @tr is non-NULL and a trailing
1805 * character exists (size is non-zero after returning from this
1806 * function), @tr is updated with the trailing character.
1808 static int proc_get_long(char **buf
, size_t *size
,
1809 unsigned long *val
, bool *neg
,
1810 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1813 char *p
, tmp
[TMPBUFLEN
];
1819 if (len
> TMPBUFLEN
- 1)
1820 len
= TMPBUFLEN
- 1;
1822 memcpy(tmp
, *buf
, len
);
1826 if (*p
== '-' && *size
> 1) {
1834 *val
= simple_strtoul(p
, &p
, 0);
1838 /* We don't know if the next char is whitespace thus we may accept
1839 * invalid integers (e.g. 1234...a) or two integers instead of one
1840 * (e.g. 123...1). So lets not allow such large numbers. */
1841 if (len
== TMPBUFLEN
- 1)
1844 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1847 if (tr
&& (len
< *size
))
1857 * proc_put_long - converts an integer to a decimal ASCII formatted string
1859 * @buf: the user buffer
1860 * @size: the size of the user buffer
1861 * @val: the integer to be converted
1862 * @neg: sign of the number, %TRUE for negative
1864 * In case of success %0 is returned and @buf and @size are updated with
1865 * the amount of bytes written.
1867 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1871 char tmp
[TMPBUFLEN
], *p
= tmp
;
1873 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1877 if (copy_to_user(*buf
, tmp
, len
))
1885 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1888 char __user
**buffer
= (char __user
**)buf
;
1889 if (put_user(c
, *buffer
))
1891 (*size
)--, (*buffer
)++;
1897 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1899 int write
, void *data
)
1902 *valp
= *negp
? -*lvalp
: *lvalp
;
1907 *lvalp
= (unsigned long)-val
;
1910 *lvalp
= (unsigned long)val
;
1916 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1918 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1919 int write
, void __user
*buffer
,
1920 size_t *lenp
, loff_t
*ppos
,
1921 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1922 int write
, void *data
),
1925 int *i
, vleft
, first
= 1, err
= 0;
1926 unsigned long page
= 0;
1930 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1935 i
= (int *) tbl_data
;
1936 vleft
= table
->maxlen
/ sizeof(*i
);
1940 conv
= do_proc_dointvec_conv
;
1943 if (left
> PAGE_SIZE
- 1)
1944 left
= PAGE_SIZE
- 1;
1945 page
= __get_free_page(GFP_TEMPORARY
);
1946 kbuf
= (char *) page
;
1949 if (copy_from_user(kbuf
, buffer
, left
)) {
1956 for (; left
&& vleft
--; i
++, first
=0) {
1961 left
-= proc_skip_spaces(&kbuf
);
1965 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1967 sizeof(proc_wspace_sep
), NULL
);
1970 if (conv(&neg
, &lval
, i
, 1, data
)) {
1975 if (conv(&neg
, &lval
, i
, 0, data
)) {
1980 err
= proc_put_char(&buffer
, &left
, '\t');
1983 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1989 if (!write
&& !first
&& left
&& !err
)
1990 err
= proc_put_char(&buffer
, &left
, '\n');
1991 if (write
&& !err
&& left
)
1992 left
-= proc_skip_spaces(&kbuf
);
1997 return err
? : -EINVAL
;
2004 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2005 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2006 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2007 int write
, void *data
),
2010 return __do_proc_dointvec(table
->data
, table
, write
,
2011 buffer
, lenp
, ppos
, conv
, data
);
2015 * proc_dointvec - read a vector of integers
2016 * @table: the sysctl table
2017 * @write: %TRUE if this is a write to the sysctl file
2018 * @buffer: the user buffer
2019 * @lenp: the size of the user buffer
2020 * @ppos: file position
2022 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2023 * values from/to the user buffer, treated as an ASCII string.
2025 * Returns 0 on success.
2027 int proc_dointvec(struct ctl_table
*table
, int write
,
2028 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2030 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2035 * Taint values can only be increased
2036 * This means we can safely use a temporary.
2038 static int proc_taint(struct ctl_table
*table
, int write
,
2039 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2042 unsigned long tmptaint
= get_taint();
2045 if (write
&& !capable(CAP_SYS_ADMIN
))
2050 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2056 * Poor man's atomic or. Not worth adding a primitive
2057 * to everyone's atomic.h for this
2060 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2061 if ((tmptaint
>> i
) & 1)
2062 add_taint(i
, LOCKDEP_STILL_OK
);
2069 #ifdef CONFIG_PRINTK
2070 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2071 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2073 if (write
&& !capable(CAP_SYS_ADMIN
))
2076 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2080 struct do_proc_dointvec_minmax_conv_param
{
2085 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2087 int write
, void *data
)
2089 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2091 int val
= *negp
? -*lvalp
: *lvalp
;
2092 if ((param
->min
&& *param
->min
> val
) ||
2093 (param
->max
&& *param
->max
< val
))
2100 *lvalp
= (unsigned long)-val
;
2103 *lvalp
= (unsigned long)val
;
2110 * proc_dointvec_minmax - read a vector of integers with min/max values
2111 * @table: the sysctl table
2112 * @write: %TRUE if this is a write to the sysctl file
2113 * @buffer: the user buffer
2114 * @lenp: the size of the user buffer
2115 * @ppos: file position
2117 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2118 * values from/to the user buffer, treated as an ASCII string.
2120 * This routine will ensure the values are within the range specified by
2121 * table->extra1 (min) and table->extra2 (max).
2123 * Returns 0 on success.
2125 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2126 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2128 struct do_proc_dointvec_minmax_conv_param param
= {
2129 .min
= (int *) table
->extra1
,
2130 .max
= (int *) table
->extra2
,
2132 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2133 do_proc_dointvec_minmax_conv
, ¶m
);
2136 static void validate_coredump_safety(void)
2138 #ifdef CONFIG_COREDUMP
2139 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2140 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2141 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2142 "suid_dumpable=2. Pipe handler or fully qualified "\
2143 "core dump path required.\n");
2148 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2149 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2151 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2153 validate_coredump_safety();
2157 #ifdef CONFIG_COREDUMP
2158 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2159 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2161 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2163 validate_coredump_safety();
2168 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2169 void __user
*buffer
,
2170 size_t *lenp
, loff_t
*ppos
,
2171 unsigned long convmul
,
2172 unsigned long convdiv
)
2174 unsigned long *i
, *min
, *max
;
2175 int vleft
, first
= 1, err
= 0;
2176 unsigned long page
= 0;
2180 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2185 i
= (unsigned long *) data
;
2186 min
= (unsigned long *) table
->extra1
;
2187 max
= (unsigned long *) table
->extra2
;
2188 vleft
= table
->maxlen
/ sizeof(unsigned long);
2192 if (left
> PAGE_SIZE
- 1)
2193 left
= PAGE_SIZE
- 1;
2194 page
= __get_free_page(GFP_TEMPORARY
);
2195 kbuf
= (char *) page
;
2198 if (copy_from_user(kbuf
, buffer
, left
)) {
2205 for (; left
&& vleft
--; i
++, first
= 0) {
2211 left
-= proc_skip_spaces(&kbuf
);
2213 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2215 sizeof(proc_wspace_sep
), NULL
);
2220 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2224 val
= convdiv
* (*i
) / convmul
;
2226 err
= proc_put_char(&buffer
, &left
, '\t');
2230 err
= proc_put_long(&buffer
, &left
, val
, false);
2236 if (!write
&& !first
&& left
&& !err
)
2237 err
= proc_put_char(&buffer
, &left
, '\n');
2239 left
-= proc_skip_spaces(&kbuf
);
2244 return err
? : -EINVAL
;
2251 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2252 void __user
*buffer
,
2253 size_t *lenp
, loff_t
*ppos
,
2254 unsigned long convmul
,
2255 unsigned long convdiv
)
2257 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2258 buffer
, lenp
, ppos
, convmul
, convdiv
);
2262 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2263 * @table: the sysctl table
2264 * @write: %TRUE if this is a write to the sysctl file
2265 * @buffer: the user buffer
2266 * @lenp: the size of the user buffer
2267 * @ppos: file position
2269 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2270 * values from/to the user buffer, treated as an ASCII string.
2272 * This routine will ensure the values are within the range specified by
2273 * table->extra1 (min) and table->extra2 (max).
2275 * Returns 0 on success.
2277 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2278 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2280 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2284 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2285 * @table: the sysctl table
2286 * @write: %TRUE if this is a write to the sysctl file
2287 * @buffer: the user buffer
2288 * @lenp: the size of the user buffer
2289 * @ppos: file position
2291 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2292 * values from/to the user buffer, treated as an ASCII string. The values
2293 * are treated as milliseconds, and converted to jiffies when they are stored.
2295 * This routine will ensure the values are within the range specified by
2296 * table->extra1 (min) and table->extra2 (max).
2298 * Returns 0 on success.
2300 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2301 void __user
*buffer
,
2302 size_t *lenp
, loff_t
*ppos
)
2304 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2305 lenp
, ppos
, HZ
, 1000l);
2309 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2311 int write
, void *data
)
2314 if (*lvalp
> LONG_MAX
/ HZ
)
2316 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2322 lval
= (unsigned long)-val
;
2325 lval
= (unsigned long)val
;
2332 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2334 int write
, void *data
)
2337 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2339 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2345 lval
= (unsigned long)-val
;
2348 lval
= (unsigned long)val
;
2350 *lvalp
= jiffies_to_clock_t(lval
);
2355 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2357 int write
, void *data
)
2360 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2370 lval
= (unsigned long)-val
;
2373 lval
= (unsigned long)val
;
2375 *lvalp
= jiffies_to_msecs(lval
);
2381 * proc_dointvec_jiffies - read a vector of integers as seconds
2382 * @table: the sysctl table
2383 * @write: %TRUE if this is a write to the sysctl file
2384 * @buffer: the user buffer
2385 * @lenp: the size of the user buffer
2386 * @ppos: file position
2388 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2389 * values from/to the user buffer, treated as an ASCII string.
2390 * The values read are assumed to be in seconds, and are converted into
2393 * Returns 0 on success.
2395 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2396 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2398 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2399 do_proc_dointvec_jiffies_conv
,NULL
);
2403 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2404 * @table: the sysctl table
2405 * @write: %TRUE if this is a write to the sysctl file
2406 * @buffer: the user buffer
2407 * @lenp: the size of the user buffer
2408 * @ppos: pointer to the file position
2410 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2411 * values from/to the user buffer, treated as an ASCII string.
2412 * The values read are assumed to be in 1/USER_HZ seconds, and
2413 * are converted into jiffies.
2415 * Returns 0 on success.
2417 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2418 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2420 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2421 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2425 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2426 * @table: the sysctl table
2427 * @write: %TRUE if this is a write to the sysctl file
2428 * @buffer: the user buffer
2429 * @lenp: the size of the user buffer
2430 * @ppos: file position
2431 * @ppos: the current position in the file
2433 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2434 * values from/to the user buffer, treated as an ASCII string.
2435 * The values read are assumed to be in 1/1000 seconds, and
2436 * are converted into jiffies.
2438 * Returns 0 on success.
2440 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2441 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2443 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2444 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2447 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2448 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2450 struct pid
*new_pid
;
2454 tmp
= pid_vnr(cad_pid
);
2456 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2457 lenp
, ppos
, NULL
, NULL
);
2461 new_pid
= find_get_pid(tmp
);
2465 put_pid(xchg(&cad_pid
, new_pid
));
2470 * proc_do_large_bitmap - read/write from/to a large bitmap
2471 * @table: the sysctl table
2472 * @write: %TRUE if this is a write to the sysctl file
2473 * @buffer: the user buffer
2474 * @lenp: the size of the user buffer
2475 * @ppos: file position
2477 * The bitmap is stored at table->data and the bitmap length (in bits)
2480 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2481 * large bitmaps may be represented in a compact manner. Writing into
2482 * the file will clear the bitmap then update it with the given input.
2484 * Returns 0 on success.
2486 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2487 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2491 size_t left
= *lenp
;
2492 unsigned long bitmap_len
= table
->maxlen
;
2493 unsigned long *bitmap
= (unsigned long *) table
->data
;
2494 unsigned long *tmp_bitmap
= NULL
;
2495 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2497 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2503 unsigned long page
= 0;
2506 if (left
> PAGE_SIZE
- 1)
2507 left
= PAGE_SIZE
- 1;
2509 page
= __get_free_page(GFP_TEMPORARY
);
2510 kbuf
= (char *) page
;
2513 if (copy_from_user(kbuf
, buffer
, left
)) {
2519 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2525 proc_skip_char(&kbuf
, &left
, '\n');
2526 while (!err
&& left
) {
2527 unsigned long val_a
, val_b
;
2530 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2534 if (val_a
>= bitmap_len
|| neg
) {
2546 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2547 &neg
, tr_b
, sizeof(tr_b
),
2551 if (val_b
>= bitmap_len
|| neg
||
2562 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2564 proc_skip_char(&kbuf
, &left
, '\n');
2568 unsigned long bit_a
, bit_b
= 0;
2571 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2572 if (bit_a
>= bitmap_len
)
2574 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2578 err
= proc_put_char(&buffer
, &left
, ',');
2582 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2585 if (bit_a
!= bit_b
) {
2586 err
= proc_put_char(&buffer
, &left
, '-');
2589 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2597 err
= proc_put_char(&buffer
, &left
, '\n');
2603 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2605 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2617 #else /* CONFIG_PROC_SYSCTL */
2619 int proc_dostring(struct ctl_table
*table
, int write
,
2620 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2625 int proc_dointvec(struct ctl_table
*table
, int write
,
2626 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2631 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2632 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2637 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2638 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2643 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2644 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2649 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2650 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2655 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2656 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2661 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2662 void __user
*buffer
,
2663 size_t *lenp
, loff_t
*ppos
)
2669 #endif /* CONFIG_PROC_SYSCTL */
2672 * No sense putting this after each symbol definition, twice,
2673 * exception granted :-)
2675 EXPORT_SYMBOL(proc_dointvec
);
2676 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2677 EXPORT_SYMBOL(proc_dointvec_minmax
);
2678 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2679 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2680 EXPORT_SYMBOL(proc_dostring
);
2681 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2682 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);