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 max_threads
;
99 extern int suid_dumpable
;
100 #ifdef CONFIG_COREDUMP
101 extern int core_uses_pid
;
102 extern char core_pattern
[];
103 extern unsigned int core_pipe_limit
;
106 extern int pid_max_min
, pid_max_max
;
107 extern int percpu_pagelist_fraction
;
108 extern int compat_log
;
109 extern int latencytop_enabled
;
110 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
112 extern int sysctl_nr_trim_pages
;
115 extern int blk_iopoll_enabled
;
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty
= 60;
124 static int __maybe_unused one
= 1;
125 static int __maybe_unused two
= 2;
126 static int __maybe_unused three
= 3;
127 static unsigned long one_ul
= 1;
128 static int one_hundred
= 100;
130 static int ten_thousand
= 10000;
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid
= 65535;
138 static int minolduid
;
139 static int min_percpu_pagelist_fract
= 8;
141 static int ngroups_max
= NGROUPS_MAX
;
142 static const int cap_last_cap
= CAP_LAST_CAP
;
144 #ifdef CONFIG_INOTIFY_USER
145 #include <linux/inotify.h>
150 #ifdef CONFIG_SPARC64
151 extern int sysctl_tsb_ratio
;
155 extern int pwrsw_enabled
;
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled
;
163 extern int unaligned_dump_stack
;
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning
;
170 #ifdef CONFIG_PROC_SYSCTL
171 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
172 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
173 static int proc_taint(struct ctl_table
*table
, int write
,
174 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
178 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
179 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
182 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
183 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
184 #ifdef CONFIG_COREDUMP
185 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
186 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
189 #ifdef CONFIG_MAGIC_SYSRQ
190 /* Note: sysrq code uses it's own private copy */
191 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
193 static int sysrq_sysctl_handler(ctl_table
*table
, int write
,
194 void __user
*buffer
, size_t *lenp
,
199 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
204 sysrq_toggle_support(__sysrq_enabled
);
211 static struct ctl_table kern_table
[];
212 static struct ctl_table vm_table
[];
213 static struct ctl_table fs_table
[];
214 static struct ctl_table debug_table
[];
215 static struct ctl_table dev_table
[];
216 extern struct ctl_table random_table
[];
218 extern struct ctl_table epoll_table
[];
221 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
222 int sysctl_legacy_va_layout
;
225 /* The default sysctl tables: */
227 static struct ctl_table sysctl_base_table
[] = {
229 .procname
= "kernel",
246 .child
= debug_table
,
256 #ifdef CONFIG_SCHED_DEBUG
257 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
258 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
259 static int min_wakeup_granularity_ns
; /* 0 usecs */
260 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
262 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
263 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
264 #endif /* CONFIG_SMP */
265 #endif /* CONFIG_SCHED_DEBUG */
267 #ifdef CONFIG_COMPACTION
268 static int min_extfrag_threshold
;
269 static int max_extfrag_threshold
= 1000;
272 static struct ctl_table kern_table
[] = {
274 .procname
= "sched_child_runs_first",
275 .data
= &sysctl_sched_child_runs_first
,
276 .maxlen
= sizeof(unsigned int),
278 .proc_handler
= proc_dointvec
,
280 #ifdef CONFIG_SCHED_DEBUG
282 .procname
= "sched_min_granularity_ns",
283 .data
= &sysctl_sched_min_granularity
,
284 .maxlen
= sizeof(unsigned int),
286 .proc_handler
= sched_proc_update_handler
,
287 .extra1
= &min_sched_granularity_ns
,
288 .extra2
= &max_sched_granularity_ns
,
291 .procname
= "sched_latency_ns",
292 .data
= &sysctl_sched_latency
,
293 .maxlen
= sizeof(unsigned int),
295 .proc_handler
= sched_proc_update_handler
,
296 .extra1
= &min_sched_granularity_ns
,
297 .extra2
= &max_sched_granularity_ns
,
300 .procname
= "sched_wakeup_granularity_ns",
301 .data
= &sysctl_sched_wakeup_granularity
,
302 .maxlen
= sizeof(unsigned int),
304 .proc_handler
= sched_proc_update_handler
,
305 .extra1
= &min_wakeup_granularity_ns
,
306 .extra2
= &max_wakeup_granularity_ns
,
310 .procname
= "sched_tunable_scaling",
311 .data
= &sysctl_sched_tunable_scaling
,
312 .maxlen
= sizeof(enum sched_tunable_scaling
),
314 .proc_handler
= sched_proc_update_handler
,
315 .extra1
= &min_sched_tunable_scaling
,
316 .extra2
= &max_sched_tunable_scaling
,
319 .procname
= "sched_migration_cost_ns",
320 .data
= &sysctl_sched_migration_cost
,
321 .maxlen
= sizeof(unsigned int),
323 .proc_handler
= proc_dointvec
,
326 .procname
= "sched_nr_migrate",
327 .data
= &sysctl_sched_nr_migrate
,
328 .maxlen
= sizeof(unsigned int),
330 .proc_handler
= proc_dointvec
,
333 .procname
= "sched_time_avg_ms",
334 .data
= &sysctl_sched_time_avg
,
335 .maxlen
= sizeof(unsigned int),
337 .proc_handler
= proc_dointvec
,
340 .procname
= "sched_shares_window_ns",
341 .data
= &sysctl_sched_shares_window
,
342 .maxlen
= sizeof(unsigned int),
344 .proc_handler
= proc_dointvec
,
347 .procname
= "timer_migration",
348 .data
= &sysctl_timer_migration
,
349 .maxlen
= sizeof(unsigned int),
351 .proc_handler
= proc_dointvec_minmax
,
355 #endif /* CONFIG_SMP */
356 #ifdef CONFIG_NUMA_BALANCING
358 .procname
= "numa_balancing_scan_delay_ms",
359 .data
= &sysctl_numa_balancing_scan_delay
,
360 .maxlen
= sizeof(unsigned int),
362 .proc_handler
= proc_dointvec
,
365 .procname
= "numa_balancing_scan_period_min_ms",
366 .data
= &sysctl_numa_balancing_scan_period_min
,
367 .maxlen
= sizeof(unsigned int),
369 .proc_handler
= proc_dointvec
,
372 .procname
= "numa_balancing_scan_period_max_ms",
373 .data
= &sysctl_numa_balancing_scan_period_max
,
374 .maxlen
= sizeof(unsigned int),
376 .proc_handler
= proc_dointvec
,
379 .procname
= "numa_balancing_scan_size_mb",
380 .data
= &sysctl_numa_balancing_scan_size
,
381 .maxlen
= sizeof(unsigned int),
383 .proc_handler
= proc_dointvec
,
386 .procname
= "numa_balancing_migrate_deferred",
387 .data
= &sysctl_numa_balancing_migrate_deferred
,
388 .maxlen
= sizeof(unsigned int),
390 .proc_handler
= proc_dointvec
,
392 #endif /* CONFIG_NUMA_BALANCING */
393 #endif /* CONFIG_SCHED_DEBUG */
395 .procname
= "sched_rt_period_us",
396 .data
= &sysctl_sched_rt_period
,
397 .maxlen
= sizeof(unsigned int),
399 .proc_handler
= sched_rt_handler
,
402 .procname
= "sched_rt_runtime_us",
403 .data
= &sysctl_sched_rt_runtime
,
404 .maxlen
= sizeof(int),
406 .proc_handler
= sched_rt_handler
,
409 .procname
= "sched_rr_timeslice_ms",
410 .data
= &sched_rr_timeslice
,
411 .maxlen
= sizeof(int),
413 .proc_handler
= sched_rr_handler
,
415 #ifdef CONFIG_SCHED_AUTOGROUP
417 .procname
= "sched_autogroup_enabled",
418 .data
= &sysctl_sched_autogroup_enabled
,
419 .maxlen
= sizeof(unsigned int),
421 .proc_handler
= proc_dointvec_minmax
,
426 #ifdef CONFIG_CFS_BANDWIDTH
428 .procname
= "sched_cfs_bandwidth_slice_us",
429 .data
= &sysctl_sched_cfs_bandwidth_slice
,
430 .maxlen
= sizeof(unsigned int),
432 .proc_handler
= proc_dointvec_minmax
,
436 #ifdef CONFIG_PROVE_LOCKING
438 .procname
= "prove_locking",
439 .data
= &prove_locking
,
440 .maxlen
= sizeof(int),
442 .proc_handler
= proc_dointvec
,
445 #ifdef CONFIG_LOCK_STAT
447 .procname
= "lock_stat",
449 .maxlen
= sizeof(int),
451 .proc_handler
= proc_dointvec
,
456 .data
= &panic_timeout
,
457 .maxlen
= sizeof(int),
459 .proc_handler
= proc_dointvec
,
461 #ifdef CONFIG_COREDUMP
463 .procname
= "core_uses_pid",
464 .data
= &core_uses_pid
,
465 .maxlen
= sizeof(int),
467 .proc_handler
= proc_dointvec
,
470 .procname
= "core_pattern",
471 .data
= core_pattern
,
472 .maxlen
= CORENAME_MAX_SIZE
,
474 .proc_handler
= proc_dostring_coredump
,
477 .procname
= "core_pipe_limit",
478 .data
= &core_pipe_limit
,
479 .maxlen
= sizeof(unsigned int),
481 .proc_handler
= proc_dointvec
,
484 #ifdef CONFIG_PROC_SYSCTL
486 .procname
= "tainted",
487 .maxlen
= sizeof(long),
489 .proc_handler
= proc_taint
,
492 #ifdef CONFIG_LATENCYTOP
494 .procname
= "latencytop",
495 .data
= &latencytop_enabled
,
496 .maxlen
= sizeof(int),
498 .proc_handler
= proc_dointvec
,
501 #ifdef CONFIG_BLK_DEV_INITRD
503 .procname
= "real-root-dev",
504 .data
= &real_root_dev
,
505 .maxlen
= sizeof(int),
507 .proc_handler
= proc_dointvec
,
511 .procname
= "print-fatal-signals",
512 .data
= &print_fatal_signals
,
513 .maxlen
= sizeof(int),
515 .proc_handler
= proc_dointvec
,
519 .procname
= "reboot-cmd",
520 .data
= reboot_command
,
523 .proc_handler
= proc_dostring
,
526 .procname
= "stop-a",
527 .data
= &stop_a_enabled
,
528 .maxlen
= sizeof (int),
530 .proc_handler
= proc_dointvec
,
533 .procname
= "scons-poweroff",
534 .data
= &scons_pwroff
,
535 .maxlen
= sizeof (int),
537 .proc_handler
= proc_dointvec
,
540 #ifdef CONFIG_SPARC64
542 .procname
= "tsb-ratio",
543 .data
= &sysctl_tsb_ratio
,
544 .maxlen
= sizeof (int),
546 .proc_handler
= proc_dointvec
,
551 .procname
= "soft-power",
552 .data
= &pwrsw_enabled
,
553 .maxlen
= sizeof (int),
555 .proc_handler
= proc_dointvec
,
558 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
560 .procname
= "unaligned-trap",
561 .data
= &unaligned_enabled
,
562 .maxlen
= sizeof (int),
564 .proc_handler
= proc_dointvec
,
568 .procname
= "ctrl-alt-del",
570 .maxlen
= sizeof(int),
572 .proc_handler
= proc_dointvec
,
574 #ifdef CONFIG_FUNCTION_TRACER
576 .procname
= "ftrace_enabled",
577 .data
= &ftrace_enabled
,
578 .maxlen
= sizeof(int),
580 .proc_handler
= ftrace_enable_sysctl
,
583 #ifdef CONFIG_STACK_TRACER
585 .procname
= "stack_tracer_enabled",
586 .data
= &stack_tracer_enabled
,
587 .maxlen
= sizeof(int),
589 .proc_handler
= stack_trace_sysctl
,
592 #ifdef CONFIG_TRACING
594 .procname
= "ftrace_dump_on_oops",
595 .data
= &ftrace_dump_on_oops
,
596 .maxlen
= sizeof(int),
598 .proc_handler
= proc_dointvec
,
601 .procname
= "traceoff_on_warning",
602 .data
= &__disable_trace_on_warning
,
603 .maxlen
= sizeof(__disable_trace_on_warning
),
605 .proc_handler
= proc_dointvec
,
608 #ifdef CONFIG_MODULES
610 .procname
= "modprobe",
611 .data
= &modprobe_path
,
612 .maxlen
= KMOD_PATH_LEN
,
614 .proc_handler
= proc_dostring
,
617 .procname
= "modules_disabled",
618 .data
= &modules_disabled
,
619 .maxlen
= sizeof(int),
621 /* only handle a transition from default "0" to "1" */
622 .proc_handler
= proc_dointvec_minmax
,
629 .procname
= "hotplug",
630 .data
= &uevent_helper
,
631 .maxlen
= UEVENT_HELPER_PATH_LEN
,
633 .proc_handler
= proc_dostring
,
636 #ifdef CONFIG_CHR_DEV_SG
638 .procname
= "sg-big-buff",
639 .data
= &sg_big_buff
,
640 .maxlen
= sizeof (int),
642 .proc_handler
= proc_dointvec
,
645 #ifdef CONFIG_BSD_PROCESS_ACCT
649 .maxlen
= 3*sizeof(int),
651 .proc_handler
= proc_dointvec
,
654 #ifdef CONFIG_MAGIC_SYSRQ
657 .data
= &__sysrq_enabled
,
658 .maxlen
= sizeof (int),
660 .proc_handler
= sysrq_sysctl_handler
,
663 #ifdef CONFIG_PROC_SYSCTL
665 .procname
= "cad_pid",
667 .maxlen
= sizeof (int),
669 .proc_handler
= proc_do_cad_pid
,
673 .procname
= "threads-max",
674 .data
= &max_threads
,
675 .maxlen
= sizeof(int),
677 .proc_handler
= proc_dointvec
,
680 .procname
= "random",
682 .child
= random_table
,
685 .procname
= "usermodehelper",
687 .child
= usermodehelper_table
,
690 .procname
= "overflowuid",
691 .data
= &overflowuid
,
692 .maxlen
= sizeof(int),
694 .proc_handler
= proc_dointvec_minmax
,
695 .extra1
= &minolduid
,
696 .extra2
= &maxolduid
,
699 .procname
= "overflowgid",
700 .data
= &overflowgid
,
701 .maxlen
= sizeof(int),
703 .proc_handler
= proc_dointvec_minmax
,
704 .extra1
= &minolduid
,
705 .extra2
= &maxolduid
,
708 #ifdef CONFIG_MATHEMU
710 .procname
= "ieee_emulation_warnings",
711 .data
= &sysctl_ieee_emulation_warnings
,
712 .maxlen
= sizeof(int),
714 .proc_handler
= proc_dointvec
,
718 .procname
= "userprocess_debug",
719 .data
= &show_unhandled_signals
,
720 .maxlen
= sizeof(int),
722 .proc_handler
= proc_dointvec
,
726 .procname
= "pid_max",
728 .maxlen
= sizeof (int),
730 .proc_handler
= proc_dointvec_minmax
,
731 .extra1
= &pid_max_min
,
732 .extra2
= &pid_max_max
,
735 .procname
= "panic_on_oops",
736 .data
= &panic_on_oops
,
737 .maxlen
= sizeof(int),
739 .proc_handler
= proc_dointvec
,
741 #if defined CONFIG_PRINTK
743 .procname
= "printk",
744 .data
= &console_loglevel
,
745 .maxlen
= 4*sizeof(int),
747 .proc_handler
= proc_dointvec
,
750 .procname
= "printk_ratelimit",
751 .data
= &printk_ratelimit_state
.interval
,
752 .maxlen
= sizeof(int),
754 .proc_handler
= proc_dointvec_jiffies
,
757 .procname
= "printk_ratelimit_burst",
758 .data
= &printk_ratelimit_state
.burst
,
759 .maxlen
= sizeof(int),
761 .proc_handler
= proc_dointvec
,
764 .procname
= "printk_delay",
765 .data
= &printk_delay_msec
,
766 .maxlen
= sizeof(int),
768 .proc_handler
= proc_dointvec_minmax
,
770 .extra2
= &ten_thousand
,
773 .procname
= "dmesg_restrict",
774 .data
= &dmesg_restrict
,
775 .maxlen
= sizeof(int),
777 .proc_handler
= proc_dointvec_minmax_sysadmin
,
782 .procname
= "kptr_restrict",
783 .data
= &kptr_restrict
,
784 .maxlen
= sizeof(int),
786 .proc_handler
= proc_dointvec_minmax_sysadmin
,
792 .procname
= "ngroups_max",
793 .data
= &ngroups_max
,
794 .maxlen
= sizeof (int),
796 .proc_handler
= proc_dointvec
,
799 .procname
= "cap_last_cap",
800 .data
= (void *)&cap_last_cap
,
801 .maxlen
= sizeof(int),
803 .proc_handler
= proc_dointvec
,
805 #if defined(CONFIG_LOCKUP_DETECTOR)
807 .procname
= "watchdog",
808 .data
= &watchdog_user_enabled
,
809 .maxlen
= sizeof (int),
811 .proc_handler
= proc_dowatchdog
,
816 .procname
= "watchdog_thresh",
817 .data
= &watchdog_thresh
,
818 .maxlen
= sizeof(int),
820 .proc_handler
= proc_dowatchdog
,
825 .procname
= "softlockup_panic",
826 .data
= &softlockup_panic
,
827 .maxlen
= sizeof(int),
829 .proc_handler
= proc_dointvec_minmax
,
834 .procname
= "nmi_watchdog",
835 .data
= &watchdog_user_enabled
,
836 .maxlen
= sizeof (int),
838 .proc_handler
= proc_dowatchdog
,
843 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
845 .procname
= "unknown_nmi_panic",
846 .data
= &unknown_nmi_panic
,
847 .maxlen
= sizeof (int),
849 .proc_handler
= proc_dointvec
,
852 #if defined(CONFIG_X86)
854 .procname
= "panic_on_unrecovered_nmi",
855 .data
= &panic_on_unrecovered_nmi
,
856 .maxlen
= sizeof(int),
858 .proc_handler
= proc_dointvec
,
861 .procname
= "panic_on_io_nmi",
862 .data
= &panic_on_io_nmi
,
863 .maxlen
= sizeof(int),
865 .proc_handler
= proc_dointvec
,
867 #ifdef CONFIG_DEBUG_STACKOVERFLOW
869 .procname
= "panic_on_stackoverflow",
870 .data
= &sysctl_panic_on_stackoverflow
,
871 .maxlen
= sizeof(int),
873 .proc_handler
= proc_dointvec
,
877 .procname
= "bootloader_type",
878 .data
= &bootloader_type
,
879 .maxlen
= sizeof (int),
881 .proc_handler
= proc_dointvec
,
884 .procname
= "bootloader_version",
885 .data
= &bootloader_version
,
886 .maxlen
= sizeof (int),
888 .proc_handler
= proc_dointvec
,
891 .procname
= "kstack_depth_to_print",
892 .data
= &kstack_depth_to_print
,
893 .maxlen
= sizeof(int),
895 .proc_handler
= proc_dointvec
,
898 .procname
= "io_delay_type",
899 .data
= &io_delay_type
,
900 .maxlen
= sizeof(int),
902 .proc_handler
= proc_dointvec
,
905 #if defined(CONFIG_MMU)
907 .procname
= "randomize_va_space",
908 .data
= &randomize_va_space
,
909 .maxlen
= sizeof(int),
911 .proc_handler
= proc_dointvec
,
914 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
916 .procname
= "spin_retry",
918 .maxlen
= sizeof (int),
920 .proc_handler
= proc_dointvec
,
923 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
925 .procname
= "acpi_video_flags",
926 .data
= &acpi_realmode_flags
,
927 .maxlen
= sizeof (unsigned long),
929 .proc_handler
= proc_doulongvec_minmax
,
932 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
934 .procname
= "ignore-unaligned-usertrap",
935 .data
= &no_unaligned_warning
,
936 .maxlen
= sizeof (int),
938 .proc_handler
= proc_dointvec
,
943 .procname
= "unaligned-dump-stack",
944 .data
= &unaligned_dump_stack
,
945 .maxlen
= sizeof (int),
947 .proc_handler
= proc_dointvec
,
950 #ifdef CONFIG_DETECT_HUNG_TASK
952 .procname
= "hung_task_panic",
953 .data
= &sysctl_hung_task_panic
,
954 .maxlen
= sizeof(int),
956 .proc_handler
= proc_dointvec_minmax
,
961 .procname
= "hung_task_check_count",
962 .data
= &sysctl_hung_task_check_count
,
963 .maxlen
= sizeof(int),
965 .proc_handler
= proc_dointvec_minmax
,
969 .procname
= "hung_task_timeout_secs",
970 .data
= &sysctl_hung_task_timeout_secs
,
971 .maxlen
= sizeof(unsigned long),
973 .proc_handler
= proc_dohung_task_timeout_secs
,
976 .procname
= "hung_task_warnings",
977 .data
= &sysctl_hung_task_warnings
,
978 .maxlen
= sizeof(unsigned long),
980 .proc_handler
= proc_doulongvec_minmax
,
985 .procname
= "compat-log",
987 .maxlen
= sizeof (int),
989 .proc_handler
= proc_dointvec
,
992 #ifdef CONFIG_RT_MUTEXES
994 .procname
= "max_lock_depth",
995 .data
= &max_lock_depth
,
996 .maxlen
= sizeof(int),
998 .proc_handler
= proc_dointvec
,
1002 .procname
= "poweroff_cmd",
1003 .data
= &poweroff_cmd
,
1004 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1006 .proc_handler
= proc_dostring
,
1012 .child
= key_sysctls
,
1015 #ifdef CONFIG_RCU_TORTURE_TEST
1017 .procname
= "rcutorture_runnable",
1018 .data
= &rcutorture_runnable
,
1019 .maxlen
= sizeof(int),
1021 .proc_handler
= proc_dointvec
,
1024 #ifdef CONFIG_PERF_EVENTS
1026 * User-space scripts rely on the existence of this file
1027 * as a feature check for perf_events being enabled.
1029 * So it's an ABI, do not remove!
1032 .procname
= "perf_event_paranoid",
1033 .data
= &sysctl_perf_event_paranoid
,
1034 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1036 .proc_handler
= proc_dointvec
,
1039 .procname
= "perf_event_mlock_kb",
1040 .data
= &sysctl_perf_event_mlock
,
1041 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1043 .proc_handler
= proc_dointvec
,
1046 .procname
= "perf_event_max_sample_rate",
1047 .data
= &sysctl_perf_event_sample_rate
,
1048 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1050 .proc_handler
= perf_proc_update_handler
,
1054 .procname
= "perf_cpu_time_max_percent",
1055 .data
= &sysctl_perf_cpu_time_max_percent
,
1056 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1058 .proc_handler
= perf_cpu_time_max_percent_handler
,
1060 .extra2
= &one_hundred
,
1063 #ifdef CONFIG_KMEMCHECK
1065 .procname
= "kmemcheck",
1066 .data
= &kmemcheck_enabled
,
1067 .maxlen
= sizeof(int),
1069 .proc_handler
= proc_dointvec
,
1074 .procname
= "blk_iopoll",
1075 .data
= &blk_iopoll_enabled
,
1076 .maxlen
= sizeof(int),
1078 .proc_handler
= proc_dointvec
,
1084 static struct ctl_table vm_table
[] = {
1086 .procname
= "overcommit_memory",
1087 .data
= &sysctl_overcommit_memory
,
1088 .maxlen
= sizeof(sysctl_overcommit_memory
),
1090 .proc_handler
= proc_dointvec_minmax
,
1095 .procname
= "panic_on_oom",
1096 .data
= &sysctl_panic_on_oom
,
1097 .maxlen
= sizeof(sysctl_panic_on_oom
),
1099 .proc_handler
= proc_dointvec_minmax
,
1104 .procname
= "oom_kill_allocating_task",
1105 .data
= &sysctl_oom_kill_allocating_task
,
1106 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1108 .proc_handler
= proc_dointvec
,
1111 .procname
= "oom_dump_tasks",
1112 .data
= &sysctl_oom_dump_tasks
,
1113 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1115 .proc_handler
= proc_dointvec
,
1118 .procname
= "overcommit_ratio",
1119 .data
= &sysctl_overcommit_ratio
,
1120 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1122 .proc_handler
= overcommit_ratio_handler
,
1125 .procname
= "overcommit_kbytes",
1126 .data
= &sysctl_overcommit_kbytes
,
1127 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1129 .proc_handler
= overcommit_kbytes_handler
,
1132 .procname
= "page-cluster",
1133 .data
= &page_cluster
,
1134 .maxlen
= sizeof(int),
1136 .proc_handler
= proc_dointvec_minmax
,
1140 .procname
= "dirty_background_ratio",
1141 .data
= &dirty_background_ratio
,
1142 .maxlen
= sizeof(dirty_background_ratio
),
1144 .proc_handler
= dirty_background_ratio_handler
,
1146 .extra2
= &one_hundred
,
1149 .procname
= "dirty_background_bytes",
1150 .data
= &dirty_background_bytes
,
1151 .maxlen
= sizeof(dirty_background_bytes
),
1153 .proc_handler
= dirty_background_bytes_handler
,
1157 .procname
= "dirty_ratio",
1158 .data
= &vm_dirty_ratio
,
1159 .maxlen
= sizeof(vm_dirty_ratio
),
1161 .proc_handler
= dirty_ratio_handler
,
1163 .extra2
= &one_hundred
,
1166 .procname
= "dirty_bytes",
1167 .data
= &vm_dirty_bytes
,
1168 .maxlen
= sizeof(vm_dirty_bytes
),
1170 .proc_handler
= dirty_bytes_handler
,
1171 .extra1
= &dirty_bytes_min
,
1174 .procname
= "dirty_writeback_centisecs",
1175 .data
= &dirty_writeback_interval
,
1176 .maxlen
= sizeof(dirty_writeback_interval
),
1178 .proc_handler
= dirty_writeback_centisecs_handler
,
1181 .procname
= "dirty_expire_centisecs",
1182 .data
= &dirty_expire_interval
,
1183 .maxlen
= sizeof(dirty_expire_interval
),
1185 .proc_handler
= proc_dointvec_minmax
,
1189 .procname
= "nr_pdflush_threads",
1190 .mode
= 0444 /* read-only */,
1191 .proc_handler
= pdflush_proc_obsolete
,
1194 .procname
= "swappiness",
1195 .data
= &vm_swappiness
,
1196 .maxlen
= sizeof(vm_swappiness
),
1198 .proc_handler
= proc_dointvec_minmax
,
1200 .extra2
= &one_hundred
,
1202 #ifdef CONFIG_HUGETLB_PAGE
1204 .procname
= "nr_hugepages",
1206 .maxlen
= sizeof(unsigned long),
1208 .proc_handler
= hugetlb_sysctl_handler
,
1209 .extra1
= (void *)&hugetlb_zero
,
1210 .extra2
= (void *)&hugetlb_infinity
,
1214 .procname
= "nr_hugepages_mempolicy",
1216 .maxlen
= sizeof(unsigned long),
1218 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1219 .extra1
= (void *)&hugetlb_zero
,
1220 .extra2
= (void *)&hugetlb_infinity
,
1224 .procname
= "hugetlb_shm_group",
1225 .data
= &sysctl_hugetlb_shm_group
,
1226 .maxlen
= sizeof(gid_t
),
1228 .proc_handler
= proc_dointvec
,
1231 .procname
= "hugepages_treat_as_movable",
1232 .data
= &hugepages_treat_as_movable
,
1233 .maxlen
= sizeof(int),
1235 .proc_handler
= proc_dointvec
,
1238 .procname
= "nr_overcommit_hugepages",
1240 .maxlen
= sizeof(unsigned long),
1242 .proc_handler
= hugetlb_overcommit_handler
,
1243 .extra1
= (void *)&hugetlb_zero
,
1244 .extra2
= (void *)&hugetlb_infinity
,
1248 .procname
= "lowmem_reserve_ratio",
1249 .data
= &sysctl_lowmem_reserve_ratio
,
1250 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1252 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1255 .procname
= "drop_caches",
1256 .data
= &sysctl_drop_caches
,
1257 .maxlen
= sizeof(int),
1259 .proc_handler
= drop_caches_sysctl_handler
,
1263 #ifdef CONFIG_COMPACTION
1265 .procname
= "compact_memory",
1266 .data
= &sysctl_compact_memory
,
1267 .maxlen
= sizeof(int),
1269 .proc_handler
= sysctl_compaction_handler
,
1272 .procname
= "extfrag_threshold",
1273 .data
= &sysctl_extfrag_threshold
,
1274 .maxlen
= sizeof(int),
1276 .proc_handler
= sysctl_extfrag_handler
,
1277 .extra1
= &min_extfrag_threshold
,
1278 .extra2
= &max_extfrag_threshold
,
1281 #endif /* CONFIG_COMPACTION */
1283 .procname
= "min_free_kbytes",
1284 .data
= &min_free_kbytes
,
1285 .maxlen
= sizeof(min_free_kbytes
),
1287 .proc_handler
= min_free_kbytes_sysctl_handler
,
1291 .procname
= "percpu_pagelist_fraction",
1292 .data
= &percpu_pagelist_fraction
,
1293 .maxlen
= sizeof(percpu_pagelist_fraction
),
1295 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1296 .extra1
= &min_percpu_pagelist_fract
,
1300 .procname
= "max_map_count",
1301 .data
= &sysctl_max_map_count
,
1302 .maxlen
= sizeof(sysctl_max_map_count
),
1304 .proc_handler
= proc_dointvec_minmax
,
1309 .procname
= "nr_trim_pages",
1310 .data
= &sysctl_nr_trim_pages
,
1311 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1313 .proc_handler
= proc_dointvec_minmax
,
1318 .procname
= "laptop_mode",
1319 .data
= &laptop_mode
,
1320 .maxlen
= sizeof(laptop_mode
),
1322 .proc_handler
= proc_dointvec_jiffies
,
1325 .procname
= "block_dump",
1326 .data
= &block_dump
,
1327 .maxlen
= sizeof(block_dump
),
1329 .proc_handler
= proc_dointvec
,
1333 .procname
= "vfs_cache_pressure",
1334 .data
= &sysctl_vfs_cache_pressure
,
1335 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1337 .proc_handler
= proc_dointvec
,
1340 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1342 .procname
= "legacy_va_layout",
1343 .data
= &sysctl_legacy_va_layout
,
1344 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1346 .proc_handler
= proc_dointvec
,
1352 .procname
= "zone_reclaim_mode",
1353 .data
= &zone_reclaim_mode
,
1354 .maxlen
= sizeof(zone_reclaim_mode
),
1356 .proc_handler
= proc_dointvec
,
1360 .procname
= "min_unmapped_ratio",
1361 .data
= &sysctl_min_unmapped_ratio
,
1362 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1364 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1366 .extra2
= &one_hundred
,
1369 .procname
= "min_slab_ratio",
1370 .data
= &sysctl_min_slab_ratio
,
1371 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1373 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1375 .extra2
= &one_hundred
,
1380 .procname
= "stat_interval",
1381 .data
= &sysctl_stat_interval
,
1382 .maxlen
= sizeof(sysctl_stat_interval
),
1384 .proc_handler
= proc_dointvec_jiffies
,
1389 .procname
= "mmap_min_addr",
1390 .data
= &dac_mmap_min_addr
,
1391 .maxlen
= sizeof(unsigned long),
1393 .proc_handler
= mmap_min_addr_handler
,
1398 .procname
= "numa_zonelist_order",
1399 .data
= &numa_zonelist_order
,
1400 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1402 .proc_handler
= numa_zonelist_order_handler
,
1405 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1406 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1408 .procname
= "vdso_enabled",
1409 .data
= &vdso_enabled
,
1410 .maxlen
= sizeof(vdso_enabled
),
1412 .proc_handler
= proc_dointvec
,
1416 #ifdef CONFIG_HIGHMEM
1418 .procname
= "highmem_is_dirtyable",
1419 .data
= &vm_highmem_is_dirtyable
,
1420 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1422 .proc_handler
= proc_dointvec_minmax
,
1428 .procname
= "scan_unevictable_pages",
1429 .data
= &scan_unevictable_pages
,
1430 .maxlen
= sizeof(scan_unevictable_pages
),
1432 .proc_handler
= scan_unevictable_handler
,
1434 #ifdef CONFIG_MEMORY_FAILURE
1436 .procname
= "memory_failure_early_kill",
1437 .data
= &sysctl_memory_failure_early_kill
,
1438 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1440 .proc_handler
= proc_dointvec_minmax
,
1445 .procname
= "memory_failure_recovery",
1446 .data
= &sysctl_memory_failure_recovery
,
1447 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1449 .proc_handler
= proc_dointvec_minmax
,
1455 .procname
= "user_reserve_kbytes",
1456 .data
= &sysctl_user_reserve_kbytes
,
1457 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1459 .proc_handler
= proc_doulongvec_minmax
,
1462 .procname
= "admin_reserve_kbytes",
1463 .data
= &sysctl_admin_reserve_kbytes
,
1464 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1466 .proc_handler
= proc_doulongvec_minmax
,
1471 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1472 static struct ctl_table binfmt_misc_table
[] = {
1477 static struct ctl_table fs_table
[] = {
1479 .procname
= "inode-nr",
1480 .data
= &inodes_stat
,
1481 .maxlen
= 2*sizeof(long),
1483 .proc_handler
= proc_nr_inodes
,
1486 .procname
= "inode-state",
1487 .data
= &inodes_stat
,
1488 .maxlen
= 7*sizeof(long),
1490 .proc_handler
= proc_nr_inodes
,
1493 .procname
= "file-nr",
1494 .data
= &files_stat
,
1495 .maxlen
= sizeof(files_stat
),
1497 .proc_handler
= proc_nr_files
,
1500 .procname
= "file-max",
1501 .data
= &files_stat
.max_files
,
1502 .maxlen
= sizeof(files_stat
.max_files
),
1504 .proc_handler
= proc_doulongvec_minmax
,
1507 .procname
= "nr_open",
1508 .data
= &sysctl_nr_open
,
1509 .maxlen
= sizeof(int),
1511 .proc_handler
= proc_dointvec_minmax
,
1512 .extra1
= &sysctl_nr_open_min
,
1513 .extra2
= &sysctl_nr_open_max
,
1516 .procname
= "dentry-state",
1517 .data
= &dentry_stat
,
1518 .maxlen
= 6*sizeof(long),
1520 .proc_handler
= proc_nr_dentry
,
1523 .procname
= "overflowuid",
1524 .data
= &fs_overflowuid
,
1525 .maxlen
= sizeof(int),
1527 .proc_handler
= proc_dointvec_minmax
,
1528 .extra1
= &minolduid
,
1529 .extra2
= &maxolduid
,
1532 .procname
= "overflowgid",
1533 .data
= &fs_overflowgid
,
1534 .maxlen
= sizeof(int),
1536 .proc_handler
= proc_dointvec_minmax
,
1537 .extra1
= &minolduid
,
1538 .extra2
= &maxolduid
,
1540 #ifdef CONFIG_FILE_LOCKING
1542 .procname
= "leases-enable",
1543 .data
= &leases_enable
,
1544 .maxlen
= sizeof(int),
1546 .proc_handler
= proc_dointvec
,
1549 #ifdef CONFIG_DNOTIFY
1551 .procname
= "dir-notify-enable",
1552 .data
= &dir_notify_enable
,
1553 .maxlen
= sizeof(int),
1555 .proc_handler
= proc_dointvec
,
1559 #ifdef CONFIG_FILE_LOCKING
1561 .procname
= "lease-break-time",
1562 .data
= &lease_break_time
,
1563 .maxlen
= sizeof(int),
1565 .proc_handler
= proc_dointvec
,
1570 .procname
= "aio-nr",
1572 .maxlen
= sizeof(aio_nr
),
1574 .proc_handler
= proc_doulongvec_minmax
,
1577 .procname
= "aio-max-nr",
1578 .data
= &aio_max_nr
,
1579 .maxlen
= sizeof(aio_max_nr
),
1581 .proc_handler
= proc_doulongvec_minmax
,
1583 #endif /* CONFIG_AIO */
1584 #ifdef CONFIG_INOTIFY_USER
1586 .procname
= "inotify",
1588 .child
= inotify_table
,
1593 .procname
= "epoll",
1595 .child
= epoll_table
,
1600 .procname
= "protected_symlinks",
1601 .data
= &sysctl_protected_symlinks
,
1602 .maxlen
= sizeof(int),
1604 .proc_handler
= proc_dointvec_minmax
,
1609 .procname
= "protected_hardlinks",
1610 .data
= &sysctl_protected_hardlinks
,
1611 .maxlen
= sizeof(int),
1613 .proc_handler
= proc_dointvec_minmax
,
1618 .procname
= "suid_dumpable",
1619 .data
= &suid_dumpable
,
1620 .maxlen
= sizeof(int),
1622 .proc_handler
= proc_dointvec_minmax_coredump
,
1626 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1628 .procname
= "binfmt_misc",
1630 .child
= binfmt_misc_table
,
1634 .procname
= "pipe-max-size",
1635 .data
= &pipe_max_size
,
1636 .maxlen
= sizeof(int),
1638 .proc_handler
= &pipe_proc_fn
,
1639 .extra1
= &pipe_min_size
,
1644 static struct ctl_table debug_table
[] = {
1645 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1647 .procname
= "exception-trace",
1648 .data
= &show_unhandled_signals
,
1649 .maxlen
= sizeof(int),
1651 .proc_handler
= proc_dointvec
1654 #if defined(CONFIG_OPTPROBES)
1656 .procname
= "kprobes-optimization",
1657 .data
= &sysctl_kprobes_optimization
,
1658 .maxlen
= sizeof(int),
1660 .proc_handler
= proc_kprobes_optimization_handler
,
1668 static struct ctl_table dev_table
[] = {
1672 int __init
sysctl_init(void)
1674 struct ctl_table_header
*hdr
;
1676 hdr
= register_sysctl_table(sysctl_base_table
);
1677 kmemleak_not_leak(hdr
);
1681 #endif /* CONFIG_SYSCTL */
1687 #ifdef CONFIG_PROC_SYSCTL
1689 static int _proc_do_string(void* data
, int maxlen
, int write
,
1690 void __user
*buffer
,
1691 size_t *lenp
, loff_t
*ppos
)
1697 if (!data
|| !maxlen
|| !*lenp
) {
1705 while (len
< *lenp
) {
1706 if (get_user(c
, p
++))
1708 if (c
== 0 || c
== '\n')
1714 if(copy_from_user(data
, buffer
, len
))
1716 ((char *) data
)[len
] = 0;
1734 if(copy_to_user(buffer
, data
, len
))
1737 if(put_user('\n', ((char __user
*) buffer
) + len
))
1748 * proc_dostring - read a string sysctl
1749 * @table: the sysctl table
1750 * @write: %TRUE if this is a write to the sysctl file
1751 * @buffer: the user buffer
1752 * @lenp: the size of the user buffer
1753 * @ppos: file position
1755 * Reads/writes a string from/to the user buffer. If the kernel
1756 * buffer provided is not large enough to hold the string, the
1757 * string is truncated. The copied string is %NULL-terminated.
1758 * If the string is being read by the user process, it is copied
1759 * and a newline '\n' is added. It is truncated if the buffer is
1762 * Returns 0 on success.
1764 int proc_dostring(struct ctl_table
*table
, int write
,
1765 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1767 return _proc_do_string(table
->data
, table
->maxlen
, write
,
1768 buffer
, lenp
, ppos
);
1771 static size_t proc_skip_spaces(char **buf
)
1774 char *tmp
= skip_spaces(*buf
);
1780 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
1790 #define TMPBUFLEN 22
1792 * proc_get_long - reads an ASCII formatted integer from a user buffer
1794 * @buf: a kernel buffer
1795 * @size: size of the kernel buffer
1796 * @val: this is where the number will be stored
1797 * @neg: set to %TRUE if number is negative
1798 * @perm_tr: a vector which contains the allowed trailers
1799 * @perm_tr_len: size of the perm_tr vector
1800 * @tr: pointer to store the trailer character
1802 * In case of success %0 is returned and @buf and @size are updated with
1803 * the amount of bytes read. If @tr is non-NULL and a trailing
1804 * character exists (size is non-zero after returning from this
1805 * function), @tr is updated with the trailing character.
1807 static int proc_get_long(char **buf
, size_t *size
,
1808 unsigned long *val
, bool *neg
,
1809 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
1812 char *p
, tmp
[TMPBUFLEN
];
1818 if (len
> TMPBUFLEN
- 1)
1819 len
= TMPBUFLEN
- 1;
1821 memcpy(tmp
, *buf
, len
);
1825 if (*p
== '-' && *size
> 1) {
1833 *val
= simple_strtoul(p
, &p
, 0);
1837 /* We don't know if the next char is whitespace thus we may accept
1838 * invalid integers (e.g. 1234...a) or two integers instead of one
1839 * (e.g. 123...1). So lets not allow such large numbers. */
1840 if (len
== TMPBUFLEN
- 1)
1843 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
1846 if (tr
&& (len
< *size
))
1856 * proc_put_long - converts an integer to a decimal ASCII formatted string
1858 * @buf: the user buffer
1859 * @size: the size of the user buffer
1860 * @val: the integer to be converted
1861 * @neg: sign of the number, %TRUE for negative
1863 * In case of success %0 is returned and @buf and @size are updated with
1864 * the amount of bytes written.
1866 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
1870 char tmp
[TMPBUFLEN
], *p
= tmp
;
1872 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
1876 if (copy_to_user(*buf
, tmp
, len
))
1884 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
1887 char __user
**buffer
= (char __user
**)buf
;
1888 if (put_user(c
, *buffer
))
1890 (*size
)--, (*buffer
)++;
1896 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
1898 int write
, void *data
)
1901 *valp
= *negp
? -*lvalp
: *lvalp
;
1906 *lvalp
= (unsigned long)-val
;
1909 *lvalp
= (unsigned long)val
;
1915 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
1917 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
1918 int write
, void __user
*buffer
,
1919 size_t *lenp
, loff_t
*ppos
,
1920 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
1921 int write
, void *data
),
1924 int *i
, vleft
, first
= 1, err
= 0;
1925 unsigned long page
= 0;
1929 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
1934 i
= (int *) tbl_data
;
1935 vleft
= table
->maxlen
/ sizeof(*i
);
1939 conv
= do_proc_dointvec_conv
;
1942 if (left
> PAGE_SIZE
- 1)
1943 left
= PAGE_SIZE
- 1;
1944 page
= __get_free_page(GFP_TEMPORARY
);
1945 kbuf
= (char *) page
;
1948 if (copy_from_user(kbuf
, buffer
, left
)) {
1955 for (; left
&& vleft
--; i
++, first
=0) {
1960 left
-= proc_skip_spaces(&kbuf
);
1964 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
1966 sizeof(proc_wspace_sep
), NULL
);
1969 if (conv(&neg
, &lval
, i
, 1, data
)) {
1974 if (conv(&neg
, &lval
, i
, 0, data
)) {
1979 err
= proc_put_char(&buffer
, &left
, '\t');
1982 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
1988 if (!write
&& !first
&& left
&& !err
)
1989 err
= proc_put_char(&buffer
, &left
, '\n');
1990 if (write
&& !err
&& left
)
1991 left
-= proc_skip_spaces(&kbuf
);
1996 return err
? : -EINVAL
;
2003 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2004 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2005 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2006 int write
, void *data
),
2009 return __do_proc_dointvec(table
->data
, table
, write
,
2010 buffer
, lenp
, ppos
, conv
, data
);
2014 * proc_dointvec - read a vector of integers
2015 * @table: the sysctl table
2016 * @write: %TRUE if this is a write to the sysctl file
2017 * @buffer: the user buffer
2018 * @lenp: the size of the user buffer
2019 * @ppos: file position
2021 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2022 * values from/to the user buffer, treated as an ASCII string.
2024 * Returns 0 on success.
2026 int proc_dointvec(struct ctl_table
*table
, int write
,
2027 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2029 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2034 * Taint values can only be increased
2035 * This means we can safely use a temporary.
2037 static int proc_taint(struct ctl_table
*table
, int write
,
2038 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2041 unsigned long tmptaint
= get_taint();
2044 if (write
&& !capable(CAP_SYS_ADMIN
))
2049 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2055 * Poor man's atomic or. Not worth adding a primitive
2056 * to everyone's atomic.h for this
2059 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2060 if ((tmptaint
>> i
) & 1)
2061 add_taint(i
, LOCKDEP_STILL_OK
);
2068 #ifdef CONFIG_PRINTK
2069 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2070 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2072 if (write
&& !capable(CAP_SYS_ADMIN
))
2075 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2079 struct do_proc_dointvec_minmax_conv_param
{
2084 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2086 int write
, void *data
)
2088 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2090 int val
= *negp
? -*lvalp
: *lvalp
;
2091 if ((param
->min
&& *param
->min
> val
) ||
2092 (param
->max
&& *param
->max
< val
))
2099 *lvalp
= (unsigned long)-val
;
2102 *lvalp
= (unsigned long)val
;
2109 * proc_dointvec_minmax - read a vector of integers with min/max values
2110 * @table: the sysctl table
2111 * @write: %TRUE if this is a write to the sysctl file
2112 * @buffer: the user buffer
2113 * @lenp: the size of the user buffer
2114 * @ppos: file position
2116 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2117 * values from/to the user buffer, treated as an ASCII string.
2119 * This routine will ensure the values are within the range specified by
2120 * table->extra1 (min) and table->extra2 (max).
2122 * Returns 0 on success.
2124 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2125 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2127 struct do_proc_dointvec_minmax_conv_param param
= {
2128 .min
= (int *) table
->extra1
,
2129 .max
= (int *) table
->extra2
,
2131 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2132 do_proc_dointvec_minmax_conv
, ¶m
);
2135 static void validate_coredump_safety(void)
2137 #ifdef CONFIG_COREDUMP
2138 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2139 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2140 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2141 "suid_dumpable=2. Pipe handler or fully qualified "\
2142 "core dump path required.\n");
2147 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2148 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2150 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2152 validate_coredump_safety();
2156 #ifdef CONFIG_COREDUMP
2157 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2158 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2160 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2162 validate_coredump_safety();
2167 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2168 void __user
*buffer
,
2169 size_t *lenp
, loff_t
*ppos
,
2170 unsigned long convmul
,
2171 unsigned long convdiv
)
2173 unsigned long *i
, *min
, *max
;
2174 int vleft
, first
= 1, err
= 0;
2175 unsigned long page
= 0;
2179 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2184 i
= (unsigned long *) data
;
2185 min
= (unsigned long *) table
->extra1
;
2186 max
= (unsigned long *) table
->extra2
;
2187 vleft
= table
->maxlen
/ sizeof(unsigned long);
2191 if (left
> PAGE_SIZE
- 1)
2192 left
= PAGE_SIZE
- 1;
2193 page
= __get_free_page(GFP_TEMPORARY
);
2194 kbuf
= (char *) page
;
2197 if (copy_from_user(kbuf
, buffer
, left
)) {
2204 for (; left
&& vleft
--; i
++, first
= 0) {
2210 left
-= proc_skip_spaces(&kbuf
);
2212 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2214 sizeof(proc_wspace_sep
), NULL
);
2219 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2223 val
= convdiv
* (*i
) / convmul
;
2225 err
= proc_put_char(&buffer
, &left
, '\t');
2229 err
= proc_put_long(&buffer
, &left
, val
, false);
2235 if (!write
&& !first
&& left
&& !err
)
2236 err
= proc_put_char(&buffer
, &left
, '\n');
2238 left
-= proc_skip_spaces(&kbuf
);
2243 return err
? : -EINVAL
;
2250 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2251 void __user
*buffer
,
2252 size_t *lenp
, loff_t
*ppos
,
2253 unsigned long convmul
,
2254 unsigned long convdiv
)
2256 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2257 buffer
, lenp
, ppos
, convmul
, convdiv
);
2261 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2262 * @table: the sysctl table
2263 * @write: %TRUE if this is a write to the sysctl file
2264 * @buffer: the user buffer
2265 * @lenp: the size of the user buffer
2266 * @ppos: file position
2268 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2269 * values from/to the user buffer, treated as an ASCII string.
2271 * This routine will ensure the values are within the range specified by
2272 * table->extra1 (min) and table->extra2 (max).
2274 * Returns 0 on success.
2276 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2277 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2279 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2283 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2284 * @table: the sysctl table
2285 * @write: %TRUE if this is a write to the sysctl file
2286 * @buffer: the user buffer
2287 * @lenp: the size of the user buffer
2288 * @ppos: file position
2290 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2291 * values from/to the user buffer, treated as an ASCII string. The values
2292 * are treated as milliseconds, and converted to jiffies when they are stored.
2294 * This routine will ensure the values are within the range specified by
2295 * table->extra1 (min) and table->extra2 (max).
2297 * Returns 0 on success.
2299 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2300 void __user
*buffer
,
2301 size_t *lenp
, loff_t
*ppos
)
2303 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2304 lenp
, ppos
, HZ
, 1000l);
2308 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2310 int write
, void *data
)
2313 if (*lvalp
> LONG_MAX
/ HZ
)
2315 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2321 lval
= (unsigned long)-val
;
2324 lval
= (unsigned long)val
;
2331 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2333 int write
, void *data
)
2336 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2338 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2344 lval
= (unsigned long)-val
;
2347 lval
= (unsigned long)val
;
2349 *lvalp
= jiffies_to_clock_t(lval
);
2354 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2356 int write
, void *data
)
2359 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2369 lval
= (unsigned long)-val
;
2372 lval
= (unsigned long)val
;
2374 *lvalp
= jiffies_to_msecs(lval
);
2380 * proc_dointvec_jiffies - read a vector of integers as seconds
2381 * @table: the sysctl table
2382 * @write: %TRUE if this is a write to the sysctl file
2383 * @buffer: the user buffer
2384 * @lenp: the size of the user buffer
2385 * @ppos: file position
2387 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2388 * values from/to the user buffer, treated as an ASCII string.
2389 * The values read are assumed to be in seconds, and are converted into
2392 * Returns 0 on success.
2394 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2395 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2397 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2398 do_proc_dointvec_jiffies_conv
,NULL
);
2402 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2403 * @table: the sysctl table
2404 * @write: %TRUE if this is a write to the sysctl file
2405 * @buffer: the user buffer
2406 * @lenp: the size of the user buffer
2407 * @ppos: pointer to the file position
2409 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2410 * values from/to the user buffer, treated as an ASCII string.
2411 * The values read are assumed to be in 1/USER_HZ seconds, and
2412 * are converted into jiffies.
2414 * Returns 0 on success.
2416 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2417 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2419 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2420 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2424 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2425 * @table: the sysctl table
2426 * @write: %TRUE if this is a write to the sysctl file
2427 * @buffer: the user buffer
2428 * @lenp: the size of the user buffer
2429 * @ppos: file position
2430 * @ppos: the current position in the file
2432 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2433 * values from/to the user buffer, treated as an ASCII string.
2434 * The values read are assumed to be in 1/1000 seconds, and
2435 * are converted into jiffies.
2437 * Returns 0 on success.
2439 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2440 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2442 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2443 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2446 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2447 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2449 struct pid
*new_pid
;
2453 tmp
= pid_vnr(cad_pid
);
2455 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2456 lenp
, ppos
, NULL
, NULL
);
2460 new_pid
= find_get_pid(tmp
);
2464 put_pid(xchg(&cad_pid
, new_pid
));
2469 * proc_do_large_bitmap - read/write from/to a large bitmap
2470 * @table: the sysctl table
2471 * @write: %TRUE if this is a write to the sysctl file
2472 * @buffer: the user buffer
2473 * @lenp: the size of the user buffer
2474 * @ppos: file position
2476 * The bitmap is stored at table->data and the bitmap length (in bits)
2479 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2480 * large bitmaps may be represented in a compact manner. Writing into
2481 * the file will clear the bitmap then update it with the given input.
2483 * Returns 0 on success.
2485 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2486 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2490 size_t left
= *lenp
;
2491 unsigned long bitmap_len
= table
->maxlen
;
2492 unsigned long *bitmap
= (unsigned long *) table
->data
;
2493 unsigned long *tmp_bitmap
= NULL
;
2494 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2496 if (!bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2502 unsigned long page
= 0;
2505 if (left
> PAGE_SIZE
- 1)
2506 left
= PAGE_SIZE
- 1;
2508 page
= __get_free_page(GFP_TEMPORARY
);
2509 kbuf
= (char *) page
;
2512 if (copy_from_user(kbuf
, buffer
, left
)) {
2518 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2524 proc_skip_char(&kbuf
, &left
, '\n');
2525 while (!err
&& left
) {
2526 unsigned long val_a
, val_b
;
2529 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2533 if (val_a
>= bitmap_len
|| neg
) {
2545 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2546 &neg
, tr_b
, sizeof(tr_b
),
2550 if (val_b
>= bitmap_len
|| neg
||
2561 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2563 proc_skip_char(&kbuf
, &left
, '\n');
2567 unsigned long bit_a
, bit_b
= 0;
2570 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2571 if (bit_a
>= bitmap_len
)
2573 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2577 err
= proc_put_char(&buffer
, &left
, ',');
2581 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2584 if (bit_a
!= bit_b
) {
2585 err
= proc_put_char(&buffer
, &left
, '-');
2588 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2596 err
= proc_put_char(&buffer
, &left
, '\n');
2602 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2604 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2616 #else /* CONFIG_PROC_SYSCTL */
2618 int proc_dostring(struct ctl_table
*table
, int write
,
2619 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2624 int proc_dointvec(struct ctl_table
*table
, int write
,
2625 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2630 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2631 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2636 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2637 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2642 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2643 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2648 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2649 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2654 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2655 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2660 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2661 void __user
*buffer
,
2662 size_t *lenp
, loff_t
*ppos
)
2668 #endif /* CONFIG_PROC_SYSCTL */
2671 * No sense putting this after each symbol definition, twice,
2672 * exception granted :-)
2674 EXPORT_SYMBOL(proc_dointvec
);
2675 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2676 EXPORT_SYMBOL(proc_dointvec_minmax
);
2677 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2678 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2679 EXPORT_SYMBOL(proc_dostring
);
2680 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2681 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);