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(int),
974 .proc_handler
= proc_dointvec_minmax
,
978 .procname
= "hung_task_timeout_secs",
979 .data
= &sysctl_hung_task_timeout_secs
,
980 .maxlen
= sizeof(unsigned long),
982 .proc_handler
= proc_dohung_task_timeout_secs
,
985 .procname
= "hung_task_warnings",
986 .data
= &sysctl_hung_task_warnings
,
987 .maxlen
= sizeof(unsigned long),
989 .proc_handler
= proc_doulongvec_minmax
,
994 .procname
= "compat-log",
996 .maxlen
= sizeof (int),
998 .proc_handler
= proc_dointvec
,
1001 #ifdef CONFIG_RT_MUTEXES
1003 .procname
= "max_lock_depth",
1004 .data
= &max_lock_depth
,
1005 .maxlen
= sizeof(int),
1007 .proc_handler
= proc_dointvec
,
1011 .procname
= "poweroff_cmd",
1012 .data
= &poweroff_cmd
,
1013 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1015 .proc_handler
= proc_dostring
,
1021 .child
= key_sysctls
,
1024 #ifdef CONFIG_RCU_TORTURE_TEST
1026 .procname
= "rcutorture_runnable",
1027 .data
= &rcutorture_runnable
,
1028 .maxlen
= sizeof(int),
1030 .proc_handler
= proc_dointvec
,
1033 #ifdef CONFIG_PERF_EVENTS
1035 * User-space scripts rely on the existence of this file
1036 * as a feature check for perf_events being enabled.
1038 * So it's an ABI, do not remove!
1041 .procname
= "perf_event_paranoid",
1042 .data
= &sysctl_perf_event_paranoid
,
1043 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1045 .proc_handler
= proc_dointvec
,
1048 .procname
= "perf_event_mlock_kb",
1049 .data
= &sysctl_perf_event_mlock
,
1050 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1052 .proc_handler
= proc_dointvec
,
1055 .procname
= "perf_event_max_sample_rate",
1056 .data
= &sysctl_perf_event_sample_rate
,
1057 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1059 .proc_handler
= perf_proc_update_handler
,
1063 .procname
= "perf_cpu_time_max_percent",
1064 .data
= &sysctl_perf_cpu_time_max_percent
,
1065 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1067 .proc_handler
= perf_cpu_time_max_percent_handler
,
1069 .extra2
= &one_hundred
,
1072 #ifdef CONFIG_KMEMCHECK
1074 .procname
= "kmemcheck",
1075 .data
= &kmemcheck_enabled
,
1076 .maxlen
= sizeof(int),
1078 .proc_handler
= proc_dointvec
,
1083 .procname
= "blk_iopoll",
1084 .data
= &blk_iopoll_enabled
,
1085 .maxlen
= sizeof(int),
1087 .proc_handler
= proc_dointvec
,
1093 static struct ctl_table vm_table
[] = {
1095 .procname
= "overcommit_memory",
1096 .data
= &sysctl_overcommit_memory
,
1097 .maxlen
= sizeof(sysctl_overcommit_memory
),
1099 .proc_handler
= proc_dointvec_minmax
,
1104 .procname
= "panic_on_oom",
1105 .data
= &sysctl_panic_on_oom
,
1106 .maxlen
= sizeof(sysctl_panic_on_oom
),
1108 .proc_handler
= proc_dointvec_minmax
,
1113 .procname
= "oom_kill_allocating_task",
1114 .data
= &sysctl_oom_kill_allocating_task
,
1115 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1117 .proc_handler
= proc_dointvec
,
1120 .procname
= "oom_dump_tasks",
1121 .data
= &sysctl_oom_dump_tasks
,
1122 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1124 .proc_handler
= proc_dointvec
,
1127 .procname
= "overcommit_ratio",
1128 .data
= &sysctl_overcommit_ratio
,
1129 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1131 .proc_handler
= proc_dointvec
,
1134 .procname
= "page-cluster",
1135 .data
= &page_cluster
,
1136 .maxlen
= sizeof(int),
1138 .proc_handler
= proc_dointvec_minmax
,
1142 .procname
= "dirty_background_ratio",
1143 .data
= &dirty_background_ratio
,
1144 .maxlen
= sizeof(dirty_background_ratio
),
1146 .proc_handler
= dirty_background_ratio_handler
,
1148 .extra2
= &one_hundred
,
1151 .procname
= "dirty_background_bytes",
1152 .data
= &dirty_background_bytes
,
1153 .maxlen
= sizeof(dirty_background_bytes
),
1155 .proc_handler
= dirty_background_bytes_handler
,
1159 .procname
= "dirty_ratio",
1160 .data
= &vm_dirty_ratio
,
1161 .maxlen
= sizeof(vm_dirty_ratio
),
1163 .proc_handler
= dirty_ratio_handler
,
1165 .extra2
= &one_hundred
,
1168 .procname
= "dirty_bytes",
1169 .data
= &vm_dirty_bytes
,
1170 .maxlen
= sizeof(vm_dirty_bytes
),
1172 .proc_handler
= dirty_bytes_handler
,
1173 .extra1
= &dirty_bytes_min
,
1176 .procname
= "dirty_writeback_centisecs",
1177 .data
= &dirty_writeback_interval
,
1178 .maxlen
= sizeof(dirty_writeback_interval
),
1180 .proc_handler
= dirty_writeback_centisecs_handler
,
1183 .procname
= "dirty_expire_centisecs",
1184 .data
= &dirty_expire_interval
,
1185 .maxlen
= sizeof(dirty_expire_interval
),
1187 .proc_handler
= proc_dointvec_minmax
,
1191 .procname
= "nr_pdflush_threads",
1192 .mode
= 0444 /* read-only */,
1193 .proc_handler
= pdflush_proc_obsolete
,
1196 .procname
= "swappiness",
1197 .data
= &vm_swappiness
,
1198 .maxlen
= sizeof(vm_swappiness
),
1200 .proc_handler
= proc_dointvec_minmax
,
1202 .extra2
= &one_hundred
,
1204 #ifdef CONFIG_HUGETLB_PAGE
1206 .procname
= "nr_hugepages",
1208 .maxlen
= sizeof(unsigned long),
1210 .proc_handler
= hugetlb_sysctl_handler
,
1211 .extra1
= (void *)&hugetlb_zero
,
1212 .extra2
= (void *)&hugetlb_infinity
,
1216 .procname
= "nr_hugepages_mempolicy",
1218 .maxlen
= sizeof(unsigned long),
1220 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1221 .extra1
= (void *)&hugetlb_zero
,
1222 .extra2
= (void *)&hugetlb_infinity
,
1226 .procname
= "hugetlb_shm_group",
1227 .data
= &sysctl_hugetlb_shm_group
,
1228 .maxlen
= sizeof(gid_t
),
1230 .proc_handler
= proc_dointvec
,
1233 .procname
= "hugepages_treat_as_movable",
1234 .data
= &hugepages_treat_as_movable
,
1235 .maxlen
= sizeof(int),
1237 .proc_handler
= proc_dointvec
,
1240 .procname
= "nr_overcommit_hugepages",
1242 .maxlen
= sizeof(unsigned long),
1244 .proc_handler
= hugetlb_overcommit_handler
,
1245 .extra1
= (void *)&hugetlb_zero
,
1246 .extra2
= (void *)&hugetlb_infinity
,
1250 .procname
= "lowmem_reserve_ratio",
1251 .data
= &sysctl_lowmem_reserve_ratio
,
1252 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1254 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1257 .procname
= "drop_caches",
1258 .data
= &sysctl_drop_caches
,
1259 .maxlen
= sizeof(int),
1261 .proc_handler
= drop_caches_sysctl_handler
,
1265 #ifdef CONFIG_COMPACTION
1267 .procname
= "compact_memory",
1268 .data
= &sysctl_compact_memory
,
1269 .maxlen
= sizeof(int),
1271 .proc_handler
= sysctl_compaction_handler
,
1274 .procname
= "extfrag_threshold",
1275 .data
= &sysctl_extfrag_threshold
,
1276 .maxlen
= sizeof(int),
1278 .proc_handler
= sysctl_extfrag_handler
,
1279 .extra1
= &min_extfrag_threshold
,
1280 .extra2
= &max_extfrag_threshold
,
1283 #endif /* CONFIG_COMPACTION */
1285 .procname
= "min_free_kbytes",
1286 .data
= &min_free_kbytes
,
1287 .maxlen
= sizeof(min_free_kbytes
),
1289 .proc_handler
= min_free_kbytes_sysctl_handler
,
1293 .procname
= "percpu_pagelist_fraction",
1294 .data
= &percpu_pagelist_fraction
,
1295 .maxlen
= sizeof(percpu_pagelist_fraction
),
1297 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1298 .extra1
= &min_percpu_pagelist_fract
,
1302 .procname
= "max_map_count",
1303 .data
= &sysctl_max_map_count
,
1304 .maxlen
= sizeof(sysctl_max_map_count
),
1306 .proc_handler
= proc_dointvec_minmax
,
1311 .procname
= "nr_trim_pages",
1312 .data
= &sysctl_nr_trim_pages
,
1313 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1315 .proc_handler
= proc_dointvec_minmax
,
1320 .procname
= "laptop_mode",
1321 .data
= &laptop_mode
,
1322 .maxlen
= sizeof(laptop_mode
),
1324 .proc_handler
= proc_dointvec_jiffies
,
1327 .procname
= "block_dump",
1328 .data
= &block_dump
,
1329 .maxlen
= sizeof(block_dump
),
1331 .proc_handler
= proc_dointvec
,
1335 .procname
= "vfs_cache_pressure",
1336 .data
= &sysctl_vfs_cache_pressure
,
1337 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1339 .proc_handler
= proc_dointvec
,
1342 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1344 .procname
= "legacy_va_layout",
1345 .data
= &sysctl_legacy_va_layout
,
1346 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1348 .proc_handler
= proc_dointvec
,
1354 .procname
= "zone_reclaim_mode",
1355 .data
= &zone_reclaim_mode
,
1356 .maxlen
= sizeof(zone_reclaim_mode
),
1358 .proc_handler
= proc_dointvec
,
1362 .procname
= "min_unmapped_ratio",
1363 .data
= &sysctl_min_unmapped_ratio
,
1364 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1366 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1368 .extra2
= &one_hundred
,
1371 .procname
= "min_slab_ratio",
1372 .data
= &sysctl_min_slab_ratio
,
1373 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1375 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1377 .extra2
= &one_hundred
,
1382 .procname
= "stat_interval",
1383 .data
= &sysctl_stat_interval
,
1384 .maxlen
= sizeof(sysctl_stat_interval
),
1386 .proc_handler
= proc_dointvec_jiffies
,
1391 .procname
= "mmap_min_addr",
1392 .data
= &dac_mmap_min_addr
,
1393 .maxlen
= sizeof(unsigned long),
1395 .proc_handler
= mmap_min_addr_handler
,
1400 .procname
= "numa_zonelist_order",
1401 .data
= &numa_zonelist_order
,
1402 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1404 .proc_handler
= numa_zonelist_order_handler
,
1407 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1408 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1410 .procname
= "vdso_enabled",
1411 .data
= &vdso_enabled
,
1412 .maxlen
= sizeof(vdso_enabled
),
1414 .proc_handler
= proc_dointvec
,
1418 #ifdef CONFIG_HIGHMEM
1420 .procname
= "highmem_is_dirtyable",
1421 .data
= &vm_highmem_is_dirtyable
,
1422 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1424 .proc_handler
= proc_dointvec_minmax
,
1430 .procname
= "scan_unevictable_pages",
1431 .data
= &scan_unevictable_pages
,
1432 .maxlen
= sizeof(scan_unevictable_pages
),
1434 .proc_handler
= scan_unevictable_handler
,
1436 #ifdef CONFIG_MEMORY_FAILURE
1438 .procname
= "memory_failure_early_kill",
1439 .data
= &sysctl_memory_failure_early_kill
,
1440 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1442 .proc_handler
= proc_dointvec_minmax
,
1447 .procname
= "memory_failure_recovery",
1448 .data
= &sysctl_memory_failure_recovery
,
1449 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1451 .proc_handler
= proc_dointvec_minmax
,
1457 .procname
= "user_reserve_kbytes",
1458 .data
= &sysctl_user_reserve_kbytes
,
1459 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1461 .proc_handler
= proc_doulongvec_minmax
,
1464 .procname
= "admin_reserve_kbytes",
1465 .data
= &sysctl_admin_reserve_kbytes
,
1466 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1468 .proc_handler
= proc_doulongvec_minmax
,
1473 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1474 static struct ctl_table binfmt_misc_table
[] = {
1479 static struct ctl_table fs_table
[] = {
1481 .procname
= "inode-nr",
1482 .data
= &inodes_stat
,
1483 .maxlen
= 2*sizeof(long),
1485 .proc_handler
= proc_nr_inodes
,
1488 .procname
= "inode-state",
1489 .data
= &inodes_stat
,
1490 .maxlen
= 7*sizeof(long),
1492 .proc_handler
= proc_nr_inodes
,
1495 .procname
= "file-nr",
1496 .data
= &files_stat
,
1497 .maxlen
= sizeof(files_stat
),
1499 .proc_handler
= proc_nr_files
,
1502 .procname
= "file-max",
1503 .data
= &files_stat
.max_files
,
1504 .maxlen
= sizeof(files_stat
.max_files
),
1506 .proc_handler
= proc_doulongvec_minmax
,
1509 .procname
= "nr_open",
1510 .data
= &sysctl_nr_open
,
1511 .maxlen
= sizeof(int),
1513 .proc_handler
= proc_dointvec_minmax
,
1514 .extra1
= &sysctl_nr_open_min
,
1515 .extra2
= &sysctl_nr_open_max
,
1518 .procname
= "dentry-state",
1519 .data
= &dentry_stat
,
1520 .maxlen
= 6*sizeof(long),
1522 .proc_handler
= proc_nr_dentry
,
1525 .procname
= "overflowuid",
1526 .data
= &fs_overflowuid
,
1527 .maxlen
= sizeof(int),
1529 .proc_handler
= proc_dointvec_minmax
,
1530 .extra1
= &minolduid
,
1531 .extra2
= &maxolduid
,
1534 .procname
= "overflowgid",
1535 .data
= &fs_overflowgid
,
1536 .maxlen
= sizeof(int),
1538 .proc_handler
= proc_dointvec_minmax
,
1539 .extra1
= &minolduid
,
1540 .extra2
= &maxolduid
,
1542 #ifdef CONFIG_FILE_LOCKING
1544 .procname
= "leases-enable",
1545 .data
= &leases_enable
,
1546 .maxlen
= sizeof(int),
1548 .proc_handler
= proc_dointvec
,
1551 #ifdef CONFIG_DNOTIFY
1553 .procname
= "dir-notify-enable",
1554 .data
= &dir_notify_enable
,
1555 .maxlen
= sizeof(int),
1557 .proc_handler
= proc_dointvec
,
1561 #ifdef CONFIG_FILE_LOCKING
1563 .procname
= "lease-break-time",
1564 .data
= &lease_break_time
,
1565 .maxlen
= sizeof(int),
1567 .proc_handler
= proc_dointvec
,
1572 .procname
= "aio-nr",
1574 .maxlen
= sizeof(aio_nr
),
1576 .proc_handler
= proc_doulongvec_minmax
,
1579 .procname
= "aio-max-nr",
1580 .data
= &aio_max_nr
,
1581 .maxlen
= sizeof(aio_max_nr
),
1583 .proc_handler
= proc_doulongvec_minmax
,
1585 #endif /* CONFIG_AIO */
1586 #ifdef CONFIG_INOTIFY_USER
1588 .procname
= "inotify",
1590 .child
= inotify_table
,
1595 .procname
= "epoll",
1597 .child
= epoll_table
,
1602 .procname
= "protected_symlinks",
1603 .data
= &sysctl_protected_symlinks
,
1604 .maxlen
= sizeof(int),
1606 .proc_handler
= proc_dointvec_minmax
,
1611 .procname
= "protected_hardlinks",
1612 .data
= &sysctl_protected_hardlinks
,
1613 .maxlen
= sizeof(int),
1615 .proc_handler
= proc_dointvec_minmax
,
1620 .procname
= "suid_dumpable",
1621 .data
= &suid_dumpable
,
1622 .maxlen
= sizeof(int),
1624 .proc_handler
= proc_dointvec_minmax_coredump
,
1628 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1630 .procname
= "binfmt_misc",
1632 .child
= binfmt_misc_table
,
1636 .procname
= "pipe-max-size",
1637 .data
= &pipe_max_size
,
1638 .maxlen
= sizeof(int),
1640 .proc_handler
= &pipe_proc_fn
,
1641 .extra1
= &pipe_min_size
,
1646 static struct ctl_table debug_table
[] = {
1647 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1649 .procname
= "exception-trace",
1650 .data
= &show_unhandled_signals
,
1651 .maxlen
= sizeof(int),
1653 .proc_handler
= proc_dointvec
1656 #if defined(CONFIG_OPTPROBES)
1658 .procname
= "kprobes-optimization",
1659 .data
= &sysctl_kprobes_optimization
,
1660 .maxlen
= sizeof(int),
1662 .proc_handler
= proc_kprobes_optimization_handler
,
1670 static struct ctl_table dev_table
[] = {
1674 int __init
sysctl_init(void)
1676 struct ctl_table_header
*hdr
;
1678 hdr
= register_sysctl_table(sysctl_base_table
);
1679 kmemleak_not_leak(hdr
);
1683 #endif /* CONFIG_SYSCTL */
1689 #ifdef CONFIG_PROC_SYSCTL
1691 static int _proc_do_string(void* data
, int maxlen
, int write
,
1692 void __user
*buffer
,
1693 size_t *lenp
, loff_t
*ppos
)
1699 if (!data
|| !maxlen
|| !*lenp
) {
1707 while (len
< *lenp
) {
1708 if (get_user(c
, p
++))
1710 if (c
== 0 || c
== '\n')
1716 if(copy_from_user(data
, buffer
, len
))
1718 ((char *) data
)[len
] = 0;
1736 if(copy_to_user(buffer
, data
, len
))
1739 if(put_user('\n', ((char __user
*) buffer
) + len
))
1750 * proc_dostring - read a string sysctl
1751 * @table: the sysctl table
1752 * @write: %TRUE if this is a write to the sysctl file
1753 * @buffer: the user buffer
1754 * @lenp: the size of the user buffer
1755 * @ppos: file position
1757 * Reads/writes a string from/to the user buffer. If the kernel
1758 * buffer provided is not large enough to hold the string, the
1759 * string is truncated. The copied string is %NULL-terminated.
1760 * If the string is being read by the user process, it is copied
1761 * and a newline '\n' is added. It is truncated if the buffer is
1764 * Returns 0 on success.
1766 int proc_dostring(struct ctl_table
*table
, int write
,
1767 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1769 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1770 buffer
, lenp
, ppos
);
1773 static size_t proc_skip_spaces(char **buf
)
1776 char *tmp
= skip_spaces(*buf
);
1782 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1792 #define TMPBUFLEN 22
1794 * proc_get_long - reads an ASCII formatted integer from a user buffer
1796 * @buf: a kernel buffer
1797 * @size: size of the kernel buffer
1798 * @val: this is where the number will be stored
1799 * @neg: set to %TRUE if number is negative
1800 * @perm_tr: a vector which contains the allowed trailers
1801 * @perm_tr_len: size of the perm_tr vector
1802 * @tr: pointer to store the trailer character
1804 * In case of success %0 is returned and @buf and @size are updated with
1805 * the amount of bytes read. If @tr is non-NULL and a trailing
1806 * character exists (size is non-zero after returning from this
1807 * function), @tr is updated with the trailing character.
1809 static int proc_get_long(char **buf
, size_t *size
,
1810 unsigned long *val
, bool *neg
,
1811 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1814 char *p
, tmp
[TMPBUFLEN
];
1820 if (len
> TMPBUFLEN
- 1)
1821 len
= TMPBUFLEN
- 1;
1823 memcpy(tmp
, *buf
, len
);
1827 if (*p
== '-' && *size
> 1) {
1835 *val
= simple_strtoul(p
, &p
, 0);
1839 /* We don't know if the next char is whitespace thus we may accept
1840 * invalid integers (e.g. 1234...a) or two integers instead of one
1841 * (e.g. 123...1). So lets not allow such large numbers. */
1842 if (len
== TMPBUFLEN
- 1)
1845 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1848 if (tr
&& (len
< *size
))
1858 * proc_put_long - converts an integer to a decimal ASCII formatted string
1860 * @buf: the user buffer
1861 * @size: the size of the user buffer
1862 * @val: the integer to be converted
1863 * @neg: sign of the number, %TRUE for negative
1865 * In case of success %0 is returned and @buf and @size are updated with
1866 * the amount of bytes written.
1868 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1872 char tmp
[TMPBUFLEN
], *p
= tmp
;
1874 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1878 if (copy_to_user(*buf
, tmp
, len
))
1886 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1889 char __user
**buffer
= (char __user
**)buf
;
1890 if (put_user(c
, *buffer
))
1892 (*size
)--, (*buffer
)++;
1898 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1900 int write
, void *data
)
1903 *valp
= *negp
? -*lvalp
: *lvalp
;
1908 *lvalp
= (unsigned long)-val
;
1911 *lvalp
= (unsigned long)val
;
1917 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1919 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1920 int write
, void __user
*buffer
,
1921 size_t *lenp
, loff_t
*ppos
,
1922 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1923 int write
, void *data
),
1926 int *i
, vleft
, first
= 1, err
= 0;
1927 unsigned long page
= 0;
1931 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1936 i
= (int *) tbl_data
;
1937 vleft
= table
->maxlen
/ sizeof(*i
);
1941 conv
= do_proc_dointvec_conv
;
1944 if (left
> PAGE_SIZE
- 1)
1945 left
= PAGE_SIZE
- 1;
1946 page
= __get_free_page(GFP_TEMPORARY
);
1947 kbuf
= (char *) page
;
1950 if (copy_from_user(kbuf
, buffer
, left
)) {
1957 for (; left
&& vleft
--; i
++, first
=0) {
1962 left
-= proc_skip_spaces(&kbuf
);
1966 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1968 sizeof(proc_wspace_sep
), NULL
);
1971 if (conv(&neg
, &lval
, i
, 1, data
)) {
1976 if (conv(&neg
, &lval
, i
, 0, data
)) {
1981 err
= proc_put_char(&buffer
, &left
, '\t');
1984 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1990 if (!write
&& !first
&& left
&& !err
)
1991 err
= proc_put_char(&buffer
, &left
, '\n');
1992 if (write
&& !err
&& left
)
1993 left
-= proc_skip_spaces(&kbuf
);
1998 return err
? : -EINVAL
;
2005 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2006 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2007 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2008 int write
, void *data
),
2011 return __do_proc_dointvec(table
->data
, table
, write
,
2012 buffer
, lenp
, ppos
, conv
, data
);
2016 * proc_dointvec - read a vector of integers
2017 * @table: the sysctl table
2018 * @write: %TRUE if this is a write to the sysctl file
2019 * @buffer: the user buffer
2020 * @lenp: the size of the user buffer
2021 * @ppos: file position
2023 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2024 * values from/to the user buffer, treated as an ASCII string.
2026 * Returns 0 on success.
2028 int proc_dointvec(struct ctl_table
*table
, int write
,
2029 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2031 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2036 * Taint values can only be increased
2037 * This means we can safely use a temporary.
2039 static int proc_taint(struct ctl_table
*table
, int write
,
2040 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2043 unsigned long tmptaint
= get_taint();
2046 if (write
&& !capable(CAP_SYS_ADMIN
))
2051 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2057 * Poor man's atomic or. Not worth adding a primitive
2058 * to everyone's atomic.h for this
2061 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2062 if ((tmptaint
>> i
) & 1)
2063 add_taint(i
, LOCKDEP_STILL_OK
);
2070 #ifdef CONFIG_PRINTK
2071 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2072 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2074 if (write
&& !capable(CAP_SYS_ADMIN
))
2077 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2081 struct do_proc_dointvec_minmax_conv_param
{
2086 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2088 int write
, void *data
)
2090 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2092 int val
= *negp
? -*lvalp
: *lvalp
;
2093 if ((param
->min
&& *param
->min
> val
) ||
2094 (param
->max
&& *param
->max
< val
))
2101 *lvalp
= (unsigned long)-val
;
2104 *lvalp
= (unsigned long)val
;
2111 * proc_dointvec_minmax - read a vector of integers with min/max values
2112 * @table: the sysctl table
2113 * @write: %TRUE if this is a write to the sysctl file
2114 * @buffer: the user buffer
2115 * @lenp: the size of the user buffer
2116 * @ppos: file position
2118 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2119 * values from/to the user buffer, treated as an ASCII string.
2121 * This routine will ensure the values are within the range specified by
2122 * table->extra1 (min) and table->extra2 (max).
2124 * Returns 0 on success.
2126 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2127 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2129 struct do_proc_dointvec_minmax_conv_param param
= {
2130 .min
= (int *) table
->extra1
,
2131 .max
= (int *) table
->extra2
,
2133 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2134 do_proc_dointvec_minmax_conv
, ¶m
);
2137 static void validate_coredump_safety(void)
2139 #ifdef CONFIG_COREDUMP
2140 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2141 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2142 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2143 "suid_dumpable=2. Pipe handler or fully qualified "\
2144 "core dump path required.\n");
2149 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2150 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2152 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2154 validate_coredump_safety();
2158 #ifdef CONFIG_COREDUMP
2159 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2160 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2162 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2164 validate_coredump_safety();
2169 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2170 void __user
*buffer
,
2171 size_t *lenp
, loff_t
*ppos
,
2172 unsigned long convmul
,
2173 unsigned long convdiv
)
2175 unsigned long *i
, *min
, *max
;
2176 int vleft
, first
= 1, err
= 0;
2177 unsigned long page
= 0;
2181 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2186 i
= (unsigned long *) data
;
2187 min
= (unsigned long *) table
->extra1
;
2188 max
= (unsigned long *) table
->extra2
;
2189 vleft
= table
->maxlen
/ sizeof(unsigned long);
2193 if (left
> PAGE_SIZE
- 1)
2194 left
= PAGE_SIZE
- 1;
2195 page
= __get_free_page(GFP_TEMPORARY
);
2196 kbuf
= (char *) page
;
2199 if (copy_from_user(kbuf
, buffer
, left
)) {
2206 for (; left
&& vleft
--; i
++, first
= 0) {
2212 left
-= proc_skip_spaces(&kbuf
);
2214 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2216 sizeof(proc_wspace_sep
), NULL
);
2221 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2225 val
= convdiv
* (*i
) / convmul
;
2227 err
= proc_put_char(&buffer
, &left
, '\t');
2231 err
= proc_put_long(&buffer
, &left
, val
, false);
2237 if (!write
&& !first
&& left
&& !err
)
2238 err
= proc_put_char(&buffer
, &left
, '\n');
2240 left
-= proc_skip_spaces(&kbuf
);
2245 return err
? : -EINVAL
;
2252 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2253 void __user
*buffer
,
2254 size_t *lenp
, loff_t
*ppos
,
2255 unsigned long convmul
,
2256 unsigned long convdiv
)
2258 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2259 buffer
, lenp
, ppos
, convmul
, convdiv
);
2263 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2264 * @table: the sysctl table
2265 * @write: %TRUE if this is a write to the sysctl file
2266 * @buffer: the user buffer
2267 * @lenp: the size of the user buffer
2268 * @ppos: file position
2270 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2271 * values from/to the user buffer, treated as an ASCII string.
2273 * This routine will ensure the values are within the range specified by
2274 * table->extra1 (min) and table->extra2 (max).
2276 * Returns 0 on success.
2278 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2279 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2281 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2285 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2286 * @table: the sysctl table
2287 * @write: %TRUE if this is a write to the sysctl file
2288 * @buffer: the user buffer
2289 * @lenp: the size of the user buffer
2290 * @ppos: file position
2292 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2293 * values from/to the user buffer, treated as an ASCII string. The values
2294 * are treated as milliseconds, and converted to jiffies when they are stored.
2296 * This routine will ensure the values are within the range specified by
2297 * table->extra1 (min) and table->extra2 (max).
2299 * Returns 0 on success.
2301 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2302 void __user
*buffer
,
2303 size_t *lenp
, loff_t
*ppos
)
2305 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2306 lenp
, ppos
, HZ
, 1000l);
2310 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2312 int write
, void *data
)
2315 if (*lvalp
> LONG_MAX
/ HZ
)
2317 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2323 lval
= (unsigned long)-val
;
2326 lval
= (unsigned long)val
;
2333 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2335 int write
, void *data
)
2338 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2340 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2346 lval
= (unsigned long)-val
;
2349 lval
= (unsigned long)val
;
2351 *lvalp
= jiffies_to_clock_t(lval
);
2356 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2358 int write
, void *data
)
2361 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2371 lval
= (unsigned long)-val
;
2374 lval
= (unsigned long)val
;
2376 *lvalp
= jiffies_to_msecs(lval
);
2382 * proc_dointvec_jiffies - read a vector of integers as seconds
2383 * @table: the sysctl table
2384 * @write: %TRUE if this is a write to the sysctl file
2385 * @buffer: the user buffer
2386 * @lenp: the size of the user buffer
2387 * @ppos: file position
2389 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2390 * values from/to the user buffer, treated as an ASCII string.
2391 * The values read are assumed to be in seconds, and are converted into
2394 * Returns 0 on success.
2396 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2397 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2399 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2400 do_proc_dointvec_jiffies_conv
,NULL
);
2404 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2405 * @table: the sysctl table
2406 * @write: %TRUE if this is a write to the sysctl file
2407 * @buffer: the user buffer
2408 * @lenp: the size of the user buffer
2409 * @ppos: pointer to the file position
2411 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2412 * values from/to the user buffer, treated as an ASCII string.
2413 * The values read are assumed to be in 1/USER_HZ seconds, and
2414 * are converted into jiffies.
2416 * Returns 0 on success.
2418 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2419 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2421 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2422 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2426 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2427 * @table: the sysctl table
2428 * @write: %TRUE if this is a write to the sysctl file
2429 * @buffer: the user buffer
2430 * @lenp: the size of the user buffer
2431 * @ppos: file position
2432 * @ppos: the current position in the file
2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2435 * values from/to the user buffer, treated as an ASCII string.
2436 * The values read are assumed to be in 1/1000 seconds, and
2437 * are converted into jiffies.
2439 * Returns 0 on success.
2441 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2442 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2444 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2445 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2448 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2449 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2451 struct pid
*new_pid
;
2455 tmp
= pid_vnr(cad_pid
);
2457 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2458 lenp
, ppos
, NULL
, NULL
);
2462 new_pid
= find_get_pid(tmp
);
2466 put_pid(xchg(&cad_pid
, new_pid
));
2471 * proc_do_large_bitmap - read/write from/to a large bitmap
2472 * @table: the sysctl table
2473 * @write: %TRUE if this is a write to the sysctl file
2474 * @buffer: the user buffer
2475 * @lenp: the size of the user buffer
2476 * @ppos: file position
2478 * The bitmap is stored at table->data and the bitmap length (in bits)
2481 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2482 * large bitmaps may be represented in a compact manner. Writing into
2483 * the file will clear the bitmap then update it with the given input.
2485 * Returns 0 on success.
2487 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2488 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2492 size_t left
= *lenp
;
2493 unsigned long bitmap_len
= table
->maxlen
;
2494 unsigned long *bitmap
= (unsigned long *) table
->data
;
2495 unsigned long *tmp_bitmap
= NULL
;
2496 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2498 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2504 unsigned long page
= 0;
2507 if (left
> PAGE_SIZE
- 1)
2508 left
= PAGE_SIZE
- 1;
2510 page
= __get_free_page(GFP_TEMPORARY
);
2511 kbuf
= (char *) page
;
2514 if (copy_from_user(kbuf
, buffer
, left
)) {
2520 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2526 proc_skip_char(&kbuf
, &left
, '\n');
2527 while (!err
&& left
) {
2528 unsigned long val_a
, val_b
;
2531 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2535 if (val_a
>= bitmap_len
|| neg
) {
2547 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2548 &neg
, tr_b
, sizeof(tr_b
),
2552 if (val_b
>= bitmap_len
|| neg
||
2563 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2565 proc_skip_char(&kbuf
, &left
, '\n');
2569 unsigned long bit_a
, bit_b
= 0;
2572 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2573 if (bit_a
>= bitmap_len
)
2575 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2579 err
= proc_put_char(&buffer
, &left
, ',');
2583 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2586 if (bit_a
!= bit_b
) {
2587 err
= proc_put_char(&buffer
, &left
, '-');
2590 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2598 err
= proc_put_char(&buffer
, &left
, '\n');
2604 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2606 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2618 #else /* CONFIG_PROC_SYSCTL */
2620 int proc_dostring(struct ctl_table
*table
, int write
,
2621 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2626 int proc_dointvec(struct ctl_table
*table
, int write
,
2627 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2632 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2633 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2638 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2639 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2644 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2645 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2650 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2651 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2656 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2657 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2662 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2663 void __user
*buffer
,
2664 size_t *lenp
, loff_t
*ppos
)
2670 #endif /* CONFIG_PROC_SYSCTL */
2673 * No sense putting this after each symbol definition, twice,
2674 * exception granted :-)
2676 EXPORT_SYMBOL(proc_dointvec
);
2677 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2678 EXPORT_SYMBOL(proc_dointvec_minmax
);
2679 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2680 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2681 EXPORT_SYMBOL(proc_dostring
);
2682 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2683 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);