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>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
70 #include <asm/uaccess.h>
71 #include <asm/processor.h>
75 #include <asm/stacktrace.h>
79 #include <asm/setup.h>
81 #ifdef CONFIG_BSD_PROCESS_ACCT
82 #include <linux/acct.h>
84 #ifdef CONFIG_RT_MUTEXES
85 #include <linux/rtmutex.h>
87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88 #include <linux/lockdep.h>
90 #ifdef CONFIG_CHR_DEV_SG
94 #ifdef CONFIG_LOCKUP_DETECTOR
95 #include <linux/nmi.h>
98 #if defined(CONFIG_SYSCTL)
100 /* External variables not in a header file. */
101 #if IS_ENABLED(CONFIG_USB)
102 int deny_new_usb __read_mostly
= 0;
103 EXPORT_SYMBOL(deny_new_usb
);
105 extern int suid_dumpable
;
106 #ifdef CONFIG_COREDUMP
107 extern int core_uses_pid
;
108 extern char core_pattern
[];
109 extern unsigned int core_pipe_limit
;
112 extern int extra_free_kbytes
;
113 extern int pid_max_min
, pid_max_max
;
114 extern int percpu_pagelist_fraction
;
115 extern int compat_log
;
116 extern int latencytop_enabled
;
117 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
119 extern int sysctl_nr_trim_pages
;
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty
= 60;
127 static int __maybe_unused neg_one
= -1;
130 static int __maybe_unused one
= 1;
131 static int __maybe_unused two
= 2;
132 static int __maybe_unused four
= 4;
133 static unsigned long one_ul
= 1;
134 static int one_hundred
= 100;
135 #ifdef CONFIG_INCREASE_MAXIMUM_SWAPPINESS
136 static int max_swappiness
= 200;
139 static int ten_thousand
= 10000;
142 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
143 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
145 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
146 static int maxolduid
= 65535;
147 static int minolduid
;
149 static int ngroups_max
= NGROUPS_MAX
;
150 static const int cap_last_cap
= CAP_LAST_CAP
;
152 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
153 #ifdef CONFIG_DETECT_HUNG_TASK
154 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
157 #ifdef CONFIG_INOTIFY_USER
158 #include <linux/inotify.h>
164 extern int pwrsw_enabled
;
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
168 extern int unaligned_enabled
;
172 extern int unaligned_dump_stack
;
175 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
176 extern int no_unaligned_warning
;
179 #ifdef CONFIG_PROC_SYSCTL
181 #define SYSCTL_WRITES_LEGACY -1
182 #define SYSCTL_WRITES_WARN 0
183 #define SYSCTL_WRITES_STRICT 1
185 static int sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
187 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
188 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
189 static int proc_taint(struct ctl_table
*table
, int write
,
190 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
194 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
195 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
198 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
199 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
200 #ifdef CONFIG_COREDUMP
201 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
202 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
205 #ifdef CONFIG_MAGIC_SYSRQ
206 /* Note: sysrq code uses it's own private copy */
207 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
209 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
210 void __user
*buffer
, size_t *lenp
,
215 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
220 sysrq_toggle_support(__sysrq_enabled
);
227 static struct ctl_table kern_table
[];
228 static struct ctl_table vm_table
[];
229 static struct ctl_table fs_table
[];
230 static struct ctl_table debug_table
[];
231 static struct ctl_table dev_table
[];
232 extern struct ctl_table random_table
[];
234 extern struct ctl_table epoll_table
[];
237 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
238 int sysctl_legacy_va_layout
;
241 /* The default sysctl tables: */
243 static struct ctl_table sysctl_base_table
[] = {
245 .procname
= "kernel",
262 .child
= debug_table
,
272 #ifdef CONFIG_SCHED_DEBUG
273 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
274 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
275 static int min_wakeup_granularity_ns
; /* 0 usecs */
276 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
278 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
279 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
280 #endif /* CONFIG_SMP */
281 #endif /* CONFIG_SCHED_DEBUG */
283 #ifdef CONFIG_COMPACTION
284 static int min_extfrag_threshold
;
285 static int max_extfrag_threshold
= 1000;
288 static struct ctl_table kern_table
[] = {
290 .procname
= "sched_child_runs_first",
291 .data
= &sysctl_sched_child_runs_first
,
292 .maxlen
= sizeof(unsigned int),
294 .proc_handler
= proc_dointvec
,
296 #ifdef CONFIG_SCHED_DEBUG
298 .procname
= "sched_min_granularity_ns",
299 .data
= &sysctl_sched_min_granularity
,
300 .maxlen
= sizeof(unsigned int),
302 .proc_handler
= sched_proc_update_handler
,
303 .extra1
= &min_sched_granularity_ns
,
304 .extra2
= &max_sched_granularity_ns
,
307 .procname
= "sched_latency_ns",
308 .data
= &sysctl_sched_latency
,
309 .maxlen
= sizeof(unsigned int),
311 .proc_handler
= sched_proc_update_handler
,
312 .extra1
= &min_sched_granularity_ns
,
313 .extra2
= &max_sched_granularity_ns
,
315 #ifdef CONFIG_SCHED_WALT
317 .procname
= "sched_use_walt_cpu_util",
318 .data
= &sysctl_sched_use_walt_cpu_util
,
319 .maxlen
= sizeof(unsigned int),
321 .proc_handler
= proc_dointvec
,
324 .procname
= "sched_use_walt_task_util",
325 .data
= &sysctl_sched_use_walt_task_util
,
326 .maxlen
= sizeof(unsigned int),
328 .proc_handler
= proc_dointvec
,
331 .procname
= "sched_walt_init_task_load_pct",
332 .data
= &sysctl_sched_walt_init_task_load_pct
,
333 .maxlen
= sizeof(unsigned int),
335 .proc_handler
= proc_dointvec
,
338 .procname
= "sched_walt_cpu_high_irqload",
339 .data
= &sysctl_sched_walt_cpu_high_irqload
,
340 .maxlen
= sizeof(unsigned int),
342 .proc_handler
= proc_dointvec
,
346 .procname
= "sched_wakeup_granularity_ns",
347 .data
= &sysctl_sched_wakeup_granularity
,
348 .maxlen
= sizeof(unsigned int),
350 .proc_handler
= sched_proc_update_handler
,
351 .extra1
= &min_wakeup_granularity_ns
,
352 .extra2
= &max_wakeup_granularity_ns
,
356 .procname
= "sched_tunable_scaling",
357 .data
= &sysctl_sched_tunable_scaling
,
358 .maxlen
= sizeof(enum sched_tunable_scaling
),
360 .proc_handler
= sched_proc_update_handler
,
361 .extra1
= &min_sched_tunable_scaling
,
362 .extra2
= &max_sched_tunable_scaling
,
365 .procname
= "sched_migration_cost_ns",
366 .data
= &sysctl_sched_migration_cost
,
367 .maxlen
= sizeof(unsigned int),
369 .proc_handler
= proc_dointvec
,
372 .procname
= "sched_nr_migrate",
373 .data
= &sysctl_sched_nr_migrate
,
374 .maxlen
= sizeof(unsigned int),
376 .proc_handler
= proc_dointvec
,
379 .procname
= "sched_time_avg_ms",
380 .data
= &sysctl_sched_time_avg
,
381 .maxlen
= sizeof(unsigned int),
383 .proc_handler
= proc_dointvec
,
386 .procname
= "sched_shares_window_ns",
387 .data
= &sysctl_sched_shares_window
,
388 .maxlen
= sizeof(unsigned int),
390 .proc_handler
= proc_dointvec
,
392 #endif /* CONFIG_SMP */
393 #ifdef CONFIG_NUMA_BALANCING
395 .procname
= "numa_balancing_scan_delay_ms",
396 .data
= &sysctl_numa_balancing_scan_delay
,
397 .maxlen
= sizeof(unsigned int),
399 .proc_handler
= proc_dointvec
,
402 .procname
= "numa_balancing_scan_period_min_ms",
403 .data
= &sysctl_numa_balancing_scan_period_min
,
404 .maxlen
= sizeof(unsigned int),
406 .proc_handler
= proc_dointvec
,
409 .procname
= "numa_balancing_scan_period_max_ms",
410 .data
= &sysctl_numa_balancing_scan_period_max
,
411 .maxlen
= sizeof(unsigned int),
413 .proc_handler
= proc_dointvec
,
416 .procname
= "numa_balancing_scan_size_mb",
417 .data
= &sysctl_numa_balancing_scan_size
,
418 .maxlen
= sizeof(unsigned int),
420 .proc_handler
= proc_dointvec_minmax
,
424 .procname
= "numa_balancing",
425 .data
= NULL
, /* filled in by handler */
426 .maxlen
= sizeof(unsigned int),
428 .proc_handler
= sysctl_numa_balancing
,
432 #endif /* CONFIG_NUMA_BALANCING */
433 #endif /* CONFIG_SCHED_DEBUG */
435 .procname
= "sched_rt_period_us",
436 .data
= &sysctl_sched_rt_period
,
437 .maxlen
= sizeof(unsigned int),
439 .proc_handler
= sched_rt_handler
,
442 .procname
= "sched_rt_runtime_us",
443 .data
= &sysctl_sched_rt_runtime
,
444 .maxlen
= sizeof(int),
446 .proc_handler
= sched_rt_handler
,
449 .procname
= "sched_rr_timeslice_ms",
450 .data
= &sched_rr_timeslice
,
451 .maxlen
= sizeof(int),
453 .proc_handler
= sched_rr_handler
,
455 #ifdef CONFIG_SCHED_USE_FLUID_RT
457 .procname
= "sysctl_sched_restrict_cluster_spill",
458 .data
= &sysctl_sched_restrict_cluster_spill
,
459 .maxlen
= sizeof(unsigned int),
461 .proc_handler
= proc_dointvec
,
464 #ifdef CONFIG_SCHED_AUTOGROUP
466 .procname
= "sched_autogroup_enabled",
467 .data
= &sysctl_sched_autogroup_enabled
,
468 .maxlen
= sizeof(unsigned int),
470 .proc_handler
= proc_dointvec_minmax
,
475 #ifdef CONFIG_CFS_BANDWIDTH
477 .procname
= "sched_cfs_bandwidth_slice_us",
478 .data
= &sysctl_sched_cfs_bandwidth_slice
,
479 .maxlen
= sizeof(unsigned int),
481 .proc_handler
= proc_dointvec_minmax
,
485 #ifdef CONFIG_SCHED_TUNE
487 .procname
= "sched_cfs_boost",
488 .data
= &sysctl_sched_cfs_boost
,
489 .maxlen
= sizeof(sysctl_sched_cfs_boost
),
490 #ifdef CONFIG_CGROUP_SCHEDTUNE
495 .proc_handler
= &sysctl_sched_cfs_boost_handler
,
497 .extra2
= &one_hundred
,
500 #ifdef CONFIG_PROVE_LOCKING
502 .procname
= "prove_locking",
503 .data
= &prove_locking
,
504 .maxlen
= sizeof(int),
506 .proc_handler
= proc_dointvec
,
509 #ifdef CONFIG_LOCK_STAT
511 .procname
= "lock_stat",
513 .maxlen
= sizeof(int),
515 .proc_handler
= proc_dointvec
,
520 .data
= &panic_timeout
,
521 .maxlen
= sizeof(int),
523 .proc_handler
= proc_dointvec
,
525 #ifdef CONFIG_COREDUMP
527 .procname
= "core_uses_pid",
528 .data
= &core_uses_pid
,
529 .maxlen
= sizeof(int),
531 .proc_handler
= proc_dointvec
,
534 .procname
= "core_pattern",
535 .data
= core_pattern
,
536 .maxlen
= CORENAME_MAX_SIZE
,
538 .proc_handler
= proc_dostring_coredump
,
541 .procname
= "core_pipe_limit",
542 .data
= &core_pipe_limit
,
543 .maxlen
= sizeof(unsigned int),
545 .proc_handler
= proc_dointvec
,
548 #ifdef CONFIG_PROC_SYSCTL
550 .procname
= "tainted",
551 .maxlen
= sizeof(long),
553 .proc_handler
= proc_taint
,
556 .procname
= "sysctl_writes_strict",
557 .data
= &sysctl_writes_strict
,
558 .maxlen
= sizeof(int),
560 .proc_handler
= proc_dointvec_minmax
,
565 #ifdef CONFIG_LATENCYTOP
567 .procname
= "latencytop",
568 .data
= &latencytop_enabled
,
569 .maxlen
= sizeof(int),
571 .proc_handler
= proc_dointvec
,
574 #ifdef CONFIG_BLK_DEV_INITRD
576 .procname
= "real-root-dev",
577 .data
= &real_root_dev
,
578 .maxlen
= sizeof(int),
580 .proc_handler
= proc_dointvec
,
584 .procname
= "print-fatal-signals",
585 .data
= &print_fatal_signals
,
586 .maxlen
= sizeof(int),
588 .proc_handler
= proc_dointvec
,
592 .procname
= "reboot-cmd",
593 .data
= reboot_command
,
596 .proc_handler
= proc_dostring
,
599 .procname
= "stop-a",
600 .data
= &stop_a_enabled
,
601 .maxlen
= sizeof (int),
603 .proc_handler
= proc_dointvec
,
606 .procname
= "scons-poweroff",
607 .data
= &scons_pwroff
,
608 .maxlen
= sizeof (int),
610 .proc_handler
= proc_dointvec
,
613 #ifdef CONFIG_SPARC64
615 .procname
= "tsb-ratio",
616 .data
= &sysctl_tsb_ratio
,
617 .maxlen
= sizeof (int),
619 .proc_handler
= proc_dointvec
,
624 .procname
= "soft-power",
625 .data
= &pwrsw_enabled
,
626 .maxlen
= sizeof (int),
628 .proc_handler
= proc_dointvec
,
631 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
633 .procname
= "unaligned-trap",
634 .data
= &unaligned_enabled
,
635 .maxlen
= sizeof (int),
637 .proc_handler
= proc_dointvec
,
641 .procname
= "ctrl-alt-del",
643 .maxlen
= sizeof(int),
645 .proc_handler
= proc_dointvec
,
647 #ifdef CONFIG_FUNCTION_TRACER
649 .procname
= "ftrace_enabled",
650 .data
= &ftrace_enabled
,
651 .maxlen
= sizeof(int),
653 .proc_handler
= ftrace_enable_sysctl
,
656 #ifdef CONFIG_STACK_TRACER
658 .procname
= "stack_tracer_enabled",
659 .data
= &stack_tracer_enabled
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= stack_trace_sysctl
,
665 #ifdef CONFIG_TRACING
667 .procname
= "ftrace_dump_on_oops",
668 .data
= &ftrace_dump_on_oops
,
669 .maxlen
= sizeof(int),
671 .proc_handler
= proc_dointvec
,
674 .procname
= "traceoff_on_warning",
675 .data
= &__disable_trace_on_warning
,
676 .maxlen
= sizeof(__disable_trace_on_warning
),
678 .proc_handler
= proc_dointvec
,
681 .procname
= "tracepoint_printk",
682 .data
= &tracepoint_printk
,
683 .maxlen
= sizeof(tracepoint_printk
),
685 .proc_handler
= proc_dointvec
,
688 #ifdef CONFIG_KEXEC_CORE
690 .procname
= "kexec_load_disabled",
691 .data
= &kexec_load_disabled
,
692 .maxlen
= sizeof(int),
694 /* only handle a transition from default "0" to "1" */
695 .proc_handler
= proc_dointvec_minmax
,
700 #ifdef CONFIG_MODULES
702 .procname
= "modprobe",
703 .data
= &modprobe_path
,
704 .maxlen
= KMOD_PATH_LEN
,
706 .proc_handler
= proc_dostring
,
709 .procname
= "modules_disabled",
710 .data
= &modules_disabled
,
711 .maxlen
= sizeof(int),
713 /* only handle a transition from default "0" to "1" */
714 .proc_handler
= proc_dointvec_minmax
,
719 #ifdef CONFIG_UEVENT_HELPER
721 .procname
= "hotplug",
722 .data
= &uevent_helper
,
723 .maxlen
= UEVENT_HELPER_PATH_LEN
,
725 .proc_handler
= proc_dostring
,
728 #ifdef CONFIG_CHR_DEV_SG
730 .procname
= "sg-big-buff",
731 .data
= &sg_big_buff
,
732 .maxlen
= sizeof (int),
734 .proc_handler
= proc_dointvec
,
737 #ifdef CONFIG_BSD_PROCESS_ACCT
741 .maxlen
= 3*sizeof(int),
743 .proc_handler
= proc_dointvec
,
746 #ifdef CONFIG_MAGIC_SYSRQ
749 .data
= &__sysrq_enabled
,
750 .maxlen
= sizeof (int),
752 .proc_handler
= sysrq_sysctl_handler
,
755 #ifdef CONFIG_PROC_SYSCTL
757 .procname
= "cad_pid",
759 .maxlen
= sizeof (int),
761 .proc_handler
= proc_do_cad_pid
,
765 .procname
= "threads-max",
767 .maxlen
= sizeof(int),
769 .proc_handler
= sysctl_max_threads
,
772 .procname
= "random",
774 .child
= random_table
,
777 .procname
= "usermodehelper",
779 .child
= usermodehelper_table
,
782 .procname
= "overflowuid",
783 .data
= &overflowuid
,
784 .maxlen
= sizeof(int),
786 .proc_handler
= proc_dointvec_minmax
,
787 .extra1
= &minolduid
,
788 .extra2
= &maxolduid
,
791 .procname
= "overflowgid",
792 .data
= &overflowgid
,
793 .maxlen
= sizeof(int),
795 .proc_handler
= proc_dointvec_minmax
,
796 .extra1
= &minolduid
,
797 .extra2
= &maxolduid
,
800 #ifdef CONFIG_MATHEMU
802 .procname
= "ieee_emulation_warnings",
803 .data
= &sysctl_ieee_emulation_warnings
,
804 .maxlen
= sizeof(int),
806 .proc_handler
= proc_dointvec
,
810 .procname
= "userprocess_debug",
811 .data
= &show_unhandled_signals
,
812 .maxlen
= sizeof(int),
814 .proc_handler
= proc_dointvec
,
818 .procname
= "pid_max",
820 .maxlen
= sizeof (int),
822 .proc_handler
= proc_dointvec_minmax
,
823 .extra1
= &pid_max_min
,
824 .extra2
= &pid_max_max
,
827 .procname
= "panic_on_oops",
828 .data
= &panic_on_oops
,
829 .maxlen
= sizeof(int),
831 .proc_handler
= proc_dointvec
,
833 #if defined CONFIG_PRINTK
835 .procname
= "printk",
836 .data
= &console_loglevel
,
837 .maxlen
= 4*sizeof(int),
839 .proc_handler
= proc_dointvec
,
842 .procname
= "printk_ratelimit",
843 .data
= &printk_ratelimit_state
.interval
,
844 .maxlen
= sizeof(int),
846 .proc_handler
= proc_dointvec_jiffies
,
849 .procname
= "printk_ratelimit_burst",
850 .data
= &printk_ratelimit_state
.burst
,
851 .maxlen
= sizeof(int),
853 .proc_handler
= proc_dointvec
,
856 .procname
= "printk_delay",
857 .data
= &printk_delay_msec
,
858 .maxlen
= sizeof(int),
860 .proc_handler
= proc_dointvec_minmax
,
862 .extra2
= &ten_thousand
,
865 .procname
= "dmesg_restrict",
866 .data
= &dmesg_restrict
,
867 .maxlen
= sizeof(int),
869 .proc_handler
= proc_dointvec_minmax_sysadmin
,
874 .procname
= "kptr_restrict",
875 .data
= &kptr_restrict
,
876 .maxlen
= sizeof(int),
878 .proc_handler
= proc_dointvec_minmax_sysadmin
,
883 #if IS_ENABLED(CONFIG_USB)
885 .procname
= "deny_new_usb",
886 .data
= &deny_new_usb
,
887 .maxlen
= sizeof(int),
889 .proc_handler
= proc_dointvec_minmax_sysadmin
,
895 .procname
= "ngroups_max",
896 .data
= &ngroups_max
,
897 .maxlen
= sizeof (int),
899 .proc_handler
= proc_dointvec
,
902 .procname
= "cap_last_cap",
903 .data
= (void *)&cap_last_cap
,
904 .maxlen
= sizeof(int),
906 .proc_handler
= proc_dointvec
,
908 #if defined(CONFIG_LOCKUP_DETECTOR)
910 .procname
= "watchdog",
911 .data
= &watchdog_user_enabled
,
912 .maxlen
= sizeof (int),
914 .proc_handler
= proc_watchdog
,
919 .procname
= "watchdog_thresh",
920 .data
= &watchdog_thresh
,
921 .maxlen
= sizeof(int),
923 .proc_handler
= proc_watchdog_thresh
,
928 .procname
= "nmi_watchdog",
929 .data
= &nmi_watchdog_enabled
,
930 .maxlen
= sizeof (int),
932 .proc_handler
= proc_nmi_watchdog
,
934 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
941 .procname
= "soft_watchdog",
942 .data
= &soft_watchdog_enabled
,
943 .maxlen
= sizeof (int),
945 .proc_handler
= proc_soft_watchdog
,
950 .procname
= "watchdog_cpumask",
951 .data
= &watchdog_cpumask_bits
,
954 .proc_handler
= proc_watchdog_cpumask
,
957 .procname
= "softlockup_panic",
958 .data
= &softlockup_panic
,
959 .maxlen
= sizeof(int),
961 .proc_handler
= proc_dointvec_minmax
,
965 #ifdef CONFIG_HARDLOCKUP_DETECTOR
967 .procname
= "hardlockup_panic",
968 .data
= &hardlockup_panic
,
969 .maxlen
= sizeof(int),
971 .proc_handler
= proc_dointvec_minmax
,
978 .procname
= "softlockup_all_cpu_backtrace",
979 .data
= &sysctl_softlockup_all_cpu_backtrace
,
980 .maxlen
= sizeof(int),
982 .proc_handler
= proc_dointvec_minmax
,
987 .procname
= "hardlockup_all_cpu_backtrace",
988 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
989 .maxlen
= sizeof(int),
991 .proc_handler
= proc_dointvec_minmax
,
995 #endif /* CONFIG_SMP */
997 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
999 .procname
= "unknown_nmi_panic",
1000 .data
= &unknown_nmi_panic
,
1001 .maxlen
= sizeof (int),
1003 .proc_handler
= proc_dointvec
,
1006 #if defined(CONFIG_X86)
1008 .procname
= "panic_on_unrecovered_nmi",
1009 .data
= &panic_on_unrecovered_nmi
,
1010 .maxlen
= sizeof(int),
1012 .proc_handler
= proc_dointvec
,
1015 .procname
= "panic_on_io_nmi",
1016 .data
= &panic_on_io_nmi
,
1017 .maxlen
= sizeof(int),
1019 .proc_handler
= proc_dointvec
,
1021 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1023 .procname
= "panic_on_stackoverflow",
1024 .data
= &sysctl_panic_on_stackoverflow
,
1025 .maxlen
= sizeof(int),
1027 .proc_handler
= proc_dointvec
,
1031 .procname
= "bootloader_type",
1032 .data
= &bootloader_type
,
1033 .maxlen
= sizeof (int),
1035 .proc_handler
= proc_dointvec
,
1038 .procname
= "bootloader_version",
1039 .data
= &bootloader_version
,
1040 .maxlen
= sizeof (int),
1042 .proc_handler
= proc_dointvec
,
1045 .procname
= "kstack_depth_to_print",
1046 .data
= &kstack_depth_to_print
,
1047 .maxlen
= sizeof(int),
1049 .proc_handler
= proc_dointvec
,
1052 .procname
= "io_delay_type",
1053 .data
= &io_delay_type
,
1054 .maxlen
= sizeof(int),
1056 .proc_handler
= proc_dointvec
,
1059 #if defined(CONFIG_MMU)
1061 .procname
= "randomize_va_space",
1062 .data
= &randomize_va_space
,
1063 .maxlen
= sizeof(int),
1065 .proc_handler
= proc_dointvec
,
1068 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1070 .procname
= "spin_retry",
1071 .data
= &spin_retry
,
1072 .maxlen
= sizeof (int),
1074 .proc_handler
= proc_dointvec
,
1077 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1079 .procname
= "acpi_video_flags",
1080 .data
= &acpi_realmode_flags
,
1081 .maxlen
= sizeof (unsigned long),
1083 .proc_handler
= proc_doulongvec_minmax
,
1086 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1088 .procname
= "ignore-unaligned-usertrap",
1089 .data
= &no_unaligned_warning
,
1090 .maxlen
= sizeof (int),
1092 .proc_handler
= proc_dointvec
,
1097 .procname
= "unaligned-dump-stack",
1098 .data
= &unaligned_dump_stack
,
1099 .maxlen
= sizeof (int),
1101 .proc_handler
= proc_dointvec
,
1104 #ifdef CONFIG_DETECT_HUNG_TASK
1106 .procname
= "hung_task_panic",
1107 .data
= &sysctl_hung_task_panic
,
1108 .maxlen
= sizeof(int),
1110 .proc_handler
= proc_dointvec_minmax
,
1115 .procname
= "hung_task_check_count",
1116 .data
= &sysctl_hung_task_check_count
,
1117 .maxlen
= sizeof(int),
1119 .proc_handler
= proc_dointvec_minmax
,
1123 .procname
= "hung_task_timeout_secs",
1124 .data
= &sysctl_hung_task_timeout_secs
,
1125 .maxlen
= sizeof(unsigned long),
1127 .proc_handler
= proc_dohung_task_timeout_secs
,
1128 .extra2
= &hung_task_timeout_max
,
1131 .procname
= "hung_task_warnings",
1132 .data
= &sysctl_hung_task_warnings
,
1133 .maxlen
= sizeof(int),
1135 .proc_handler
= proc_dointvec_minmax
,
1139 #ifdef CONFIG_COMPAT
1141 .procname
= "compat-log",
1142 .data
= &compat_log
,
1143 .maxlen
= sizeof (int),
1145 .proc_handler
= proc_dointvec
,
1148 #ifdef CONFIG_RT_MUTEXES
1150 .procname
= "max_lock_depth",
1151 .data
= &max_lock_depth
,
1152 .maxlen
= sizeof(int),
1154 .proc_handler
= proc_dointvec
,
1158 .procname
= "poweroff_cmd",
1159 .data
= &poweroff_cmd
,
1160 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1162 .proc_handler
= proc_dostring
,
1168 .child
= key_sysctls
,
1171 #ifdef CONFIG_PERF_EVENTS
1173 * User-space scripts rely on the existence of this file
1174 * as a feature check for perf_events being enabled.
1176 * So it's an ABI, do not remove!
1179 .procname
= "perf_event_paranoid",
1180 .data
= &sysctl_perf_event_paranoid
,
1181 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1183 .proc_handler
= proc_dointvec
,
1186 .procname
= "perf_event_mlock_kb",
1187 .data
= &sysctl_perf_event_mlock
,
1188 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1190 .proc_handler
= proc_dointvec
,
1193 .procname
= "perf_event_max_sample_rate",
1194 .data
= &sysctl_perf_event_sample_rate
,
1195 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1197 .proc_handler
= perf_proc_update_handler
,
1201 .procname
= "perf_cpu_time_max_percent",
1202 .data
= &sysctl_perf_cpu_time_max_percent
,
1203 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1205 .proc_handler
= perf_cpu_time_max_percent_handler
,
1207 .extra2
= &one_hundred
,
1210 #ifdef CONFIG_KMEMCHECK
1212 .procname
= "kmemcheck",
1213 .data
= &kmemcheck_enabled
,
1214 .maxlen
= sizeof(int),
1216 .proc_handler
= proc_dointvec
,
1220 .procname
= "panic_on_warn",
1221 .data
= &panic_on_warn
,
1222 .maxlen
= sizeof(int),
1224 .proc_handler
= proc_dointvec_minmax
,
1228 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1230 .procname
= "timer_migration",
1231 .data
= &sysctl_timer_migration
,
1232 .maxlen
= sizeof(unsigned int),
1234 .proc_handler
= timer_migration_handler
,
1239 #ifdef CONFIG_BPF_SYSCALL
1241 .procname
= "unprivileged_bpf_disabled",
1242 .data
= &sysctl_unprivileged_bpf_disabled
,
1243 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1245 /* only handle a transition from default "0" to "1" */
1246 .proc_handler
= proc_dointvec_minmax
,
1254 static struct ctl_table vm_table
[] = {
1256 .procname
= "overcommit_memory",
1257 .data
= &sysctl_overcommit_memory
,
1258 .maxlen
= sizeof(sysctl_overcommit_memory
),
1260 .proc_handler
= proc_dointvec_minmax
,
1265 .procname
= "panic_on_oom",
1266 .data
= &sysctl_panic_on_oom
,
1267 .maxlen
= sizeof(sysctl_panic_on_oom
),
1269 .proc_handler
= proc_dointvec_minmax
,
1274 .procname
= "oom_kill_allocating_task",
1275 .data
= &sysctl_oom_kill_allocating_task
,
1276 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1278 .proc_handler
= proc_dointvec
,
1281 .procname
= "oom_dump_tasks",
1282 .data
= &sysctl_oom_dump_tasks
,
1283 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1285 .proc_handler
= proc_dointvec
,
1288 .procname
= "overcommit_ratio",
1289 .data
= &sysctl_overcommit_ratio
,
1290 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1292 .proc_handler
= overcommit_ratio_handler
,
1295 .procname
= "overcommit_kbytes",
1296 .data
= &sysctl_overcommit_kbytes
,
1297 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1299 .proc_handler
= overcommit_kbytes_handler
,
1302 .procname
= "page-cluster",
1303 .data
= &page_cluster
,
1304 .maxlen
= sizeof(int),
1306 .proc_handler
= proc_dointvec_minmax
,
1310 .procname
= "dirty_background_ratio",
1311 .data
= &dirty_background_ratio
,
1312 .maxlen
= sizeof(dirty_background_ratio
),
1314 .proc_handler
= dirty_background_ratio_handler
,
1316 .extra2
= &one_hundred
,
1319 .procname
= "dirty_background_bytes",
1320 .data
= &dirty_background_bytes
,
1321 .maxlen
= sizeof(dirty_background_bytes
),
1323 .proc_handler
= dirty_background_bytes_handler
,
1327 .procname
= "dirty_ratio",
1328 .data
= &vm_dirty_ratio
,
1329 .maxlen
= sizeof(vm_dirty_ratio
),
1331 .proc_handler
= dirty_ratio_handler
,
1333 .extra2
= &one_hundred
,
1336 .procname
= "dirty_bytes",
1337 .data
= &vm_dirty_bytes
,
1338 .maxlen
= sizeof(vm_dirty_bytes
),
1340 .proc_handler
= dirty_bytes_handler
,
1341 .extra1
= &dirty_bytes_min
,
1344 .procname
= "dirty_writeback_centisecs",
1345 .data
= &dirty_writeback_interval
,
1346 .maxlen
= sizeof(dirty_writeback_interval
),
1348 .proc_handler
= dirty_writeback_centisecs_handler
,
1351 .procname
= "dirty_expire_centisecs",
1352 .data
= &dirty_expire_interval
,
1353 .maxlen
= sizeof(dirty_expire_interval
),
1355 .proc_handler
= proc_dointvec_minmax
,
1359 .procname
= "dirtytime_expire_seconds",
1360 .data
= &dirtytime_expire_interval
,
1361 .maxlen
= sizeof(dirty_expire_interval
),
1363 .proc_handler
= dirtytime_interval_handler
,
1367 .procname
= "nr_pdflush_threads",
1368 .mode
= 0444 /* read-only */,
1369 .proc_handler
= pdflush_proc_obsolete
,
1372 .procname
= "swappiness",
1373 .data
= &vm_swappiness
,
1374 .maxlen
= sizeof(vm_swappiness
),
1376 .proc_handler
= proc_dointvec_minmax
,
1378 #ifdef CONFIG_INCREASE_MAXIMUM_SWAPPINESS
1379 .extra2
= &max_swappiness
,
1381 .extra2
= &one_hundred
,
1384 #ifdef CONFIG_HUGETLB_PAGE
1386 .procname
= "nr_hugepages",
1388 .maxlen
= sizeof(unsigned long),
1390 .proc_handler
= hugetlb_sysctl_handler
,
1394 .procname
= "nr_hugepages_mempolicy",
1396 .maxlen
= sizeof(unsigned long),
1398 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1402 .procname
= "hugetlb_shm_group",
1403 .data
= &sysctl_hugetlb_shm_group
,
1404 .maxlen
= sizeof(gid_t
),
1406 .proc_handler
= proc_dointvec
,
1409 .procname
= "hugepages_treat_as_movable",
1410 .data
= &hugepages_treat_as_movable
,
1411 .maxlen
= sizeof(int),
1413 .proc_handler
= proc_dointvec
,
1416 .procname
= "nr_overcommit_hugepages",
1418 .maxlen
= sizeof(unsigned long),
1420 .proc_handler
= hugetlb_overcommit_handler
,
1424 .procname
= "lowmem_reserve_ratio",
1425 .data
= &sysctl_lowmem_reserve_ratio
,
1426 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1428 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1431 .procname
= "drop_caches",
1432 .data
= &sysctl_drop_caches
,
1433 .maxlen
= sizeof(int),
1435 .proc_handler
= drop_caches_sysctl_handler
,
1439 #ifdef CONFIG_COMPACTION
1441 .procname
= "compact_memory",
1442 .data
= &sysctl_compact_memory
,
1443 .maxlen
= sizeof(int),
1445 .proc_handler
= sysctl_compaction_handler
,
1448 .procname
= "extfrag_threshold",
1449 .data
= &sysctl_extfrag_threshold
,
1450 .maxlen
= sizeof(int),
1452 .proc_handler
= sysctl_extfrag_handler
,
1453 .extra1
= &min_extfrag_threshold
,
1454 .extra2
= &max_extfrag_threshold
,
1457 .procname
= "compact_unevictable_allowed",
1458 .data
= &sysctl_compact_unevictable_allowed
,
1459 .maxlen
= sizeof(int),
1461 .proc_handler
= proc_dointvec
,
1466 #endif /* CONFIG_COMPACTION */
1468 .procname
= "min_free_kbytes",
1469 .data
= &min_free_kbytes
,
1470 .maxlen
= sizeof(min_free_kbytes
),
1472 .proc_handler
= min_free_kbytes_sysctl_handler
,
1476 .procname
= "extra_free_kbytes",
1477 .data
= &extra_free_kbytes
,
1478 .maxlen
= sizeof(extra_free_kbytes
),
1480 .proc_handler
= min_free_kbytes_sysctl_handler
,
1484 .procname
= "percpu_pagelist_fraction",
1485 .data
= &percpu_pagelist_fraction
,
1486 .maxlen
= sizeof(percpu_pagelist_fraction
),
1488 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1493 .procname
= "max_map_count",
1494 .data
= &sysctl_max_map_count
,
1495 .maxlen
= sizeof(sysctl_max_map_count
),
1497 .proc_handler
= proc_dointvec_minmax
,
1502 .procname
= "nr_trim_pages",
1503 .data
= &sysctl_nr_trim_pages
,
1504 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1506 .proc_handler
= proc_dointvec_minmax
,
1511 .procname
= "laptop_mode",
1512 .data
= &laptop_mode
,
1513 .maxlen
= sizeof(laptop_mode
),
1515 .proc_handler
= proc_dointvec_jiffies
,
1518 .procname
= "block_dump",
1519 .data
= &block_dump
,
1520 .maxlen
= sizeof(block_dump
),
1522 .proc_handler
= proc_dointvec
,
1526 .procname
= "vfs_cache_pressure",
1527 .data
= &sysctl_vfs_cache_pressure
,
1528 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1530 .proc_handler
= proc_dointvec
,
1533 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1535 .procname
= "legacy_va_layout",
1536 .data
= &sysctl_legacy_va_layout
,
1537 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1539 .proc_handler
= proc_dointvec
,
1545 .procname
= "zone_reclaim_mode",
1546 .data
= &zone_reclaim_mode
,
1547 .maxlen
= sizeof(zone_reclaim_mode
),
1549 .proc_handler
= proc_dointvec
,
1553 .procname
= "min_unmapped_ratio",
1554 .data
= &sysctl_min_unmapped_ratio
,
1555 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1557 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1559 .extra2
= &one_hundred
,
1562 .procname
= "min_slab_ratio",
1563 .data
= &sysctl_min_slab_ratio
,
1564 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1566 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1568 .extra2
= &one_hundred
,
1573 .procname
= "stat_interval",
1574 .data
= &sysctl_stat_interval
,
1575 .maxlen
= sizeof(sysctl_stat_interval
),
1577 .proc_handler
= proc_dointvec_jiffies
,
1582 .procname
= "mmap_min_addr",
1583 .data
= &dac_mmap_min_addr
,
1584 .maxlen
= sizeof(unsigned long),
1586 .proc_handler
= mmap_min_addr_handler
,
1591 .procname
= "numa_zonelist_order",
1592 .data
= &numa_zonelist_order
,
1593 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1595 .proc_handler
= numa_zonelist_order_handler
,
1598 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1599 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1601 .procname
= "vdso_enabled",
1602 #ifdef CONFIG_X86_32
1603 .data
= &vdso32_enabled
,
1604 .maxlen
= sizeof(vdso32_enabled
),
1606 .data
= &vdso_enabled
,
1607 .maxlen
= sizeof(vdso_enabled
),
1610 .proc_handler
= proc_dointvec
,
1614 #ifdef CONFIG_HIGHMEM
1616 .procname
= "highmem_is_dirtyable",
1617 .data
= &vm_highmem_is_dirtyable
,
1618 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1620 .proc_handler
= proc_dointvec_minmax
,
1625 #ifdef CONFIG_MEMORY_FAILURE
1627 .procname
= "memory_failure_early_kill",
1628 .data
= &sysctl_memory_failure_early_kill
,
1629 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1631 .proc_handler
= proc_dointvec_minmax
,
1636 .procname
= "memory_failure_recovery",
1637 .data
= &sysctl_memory_failure_recovery
,
1638 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1640 .proc_handler
= proc_dointvec_minmax
,
1646 .procname
= "user_reserve_kbytes",
1647 .data
= &sysctl_user_reserve_kbytes
,
1648 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1650 .proc_handler
= proc_doulongvec_minmax
,
1653 .procname
= "admin_reserve_kbytes",
1654 .data
= &sysctl_admin_reserve_kbytes
,
1655 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1657 .proc_handler
= proc_doulongvec_minmax
,
1659 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1661 .procname
= "mmap_rnd_bits",
1662 .data
= &mmap_rnd_bits
,
1663 .maxlen
= sizeof(mmap_rnd_bits
),
1665 .proc_handler
= proc_dointvec_minmax
,
1666 .extra1
= (void *)&mmap_rnd_bits_min
,
1667 .extra2
= (void *)&mmap_rnd_bits_max
,
1670 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1672 .procname
= "mmap_rnd_compat_bits",
1673 .data
= &mmap_rnd_compat_bits
,
1674 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1676 .proc_handler
= proc_dointvec_minmax
,
1677 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1678 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1684 static struct ctl_table fs_table
[] = {
1686 .procname
= "inode-nr",
1687 .data
= &inodes_stat
,
1688 .maxlen
= 2*sizeof(long),
1690 .proc_handler
= proc_nr_inodes
,
1693 .procname
= "inode-state",
1694 .data
= &inodes_stat
,
1695 .maxlen
= 7*sizeof(long),
1697 .proc_handler
= proc_nr_inodes
,
1700 .procname
= "file-nr",
1701 .data
= &files_stat
,
1702 .maxlen
= sizeof(files_stat
),
1704 .proc_handler
= proc_nr_files
,
1707 .procname
= "file-max",
1708 .data
= &files_stat
.max_files
,
1709 .maxlen
= sizeof(files_stat
.max_files
),
1711 .proc_handler
= proc_doulongvec_minmax
,
1714 .procname
= "nr_open",
1715 .data
= &sysctl_nr_open
,
1716 .maxlen
= sizeof(int),
1718 .proc_handler
= proc_dointvec_minmax
,
1719 .extra1
= &sysctl_nr_open_min
,
1720 .extra2
= &sysctl_nr_open_max
,
1723 .procname
= "dentry-state",
1724 .data
= &dentry_stat
,
1725 .maxlen
= 6*sizeof(long),
1727 .proc_handler
= proc_nr_dentry
,
1730 .procname
= "overflowuid",
1731 .data
= &fs_overflowuid
,
1732 .maxlen
= sizeof(int),
1734 .proc_handler
= proc_dointvec_minmax
,
1735 .extra1
= &minolduid
,
1736 .extra2
= &maxolduid
,
1739 .procname
= "overflowgid",
1740 .data
= &fs_overflowgid
,
1741 .maxlen
= sizeof(int),
1743 .proc_handler
= proc_dointvec_minmax
,
1744 .extra1
= &minolduid
,
1745 .extra2
= &maxolduid
,
1747 #ifdef CONFIG_FILE_LOCKING
1749 .procname
= "leases-enable",
1750 .data
= &leases_enable
,
1751 .maxlen
= sizeof(int),
1753 .proc_handler
= proc_dointvec
,
1756 #ifdef CONFIG_DNOTIFY
1758 .procname
= "dir-notify-enable",
1759 .data
= &dir_notify_enable
,
1760 .maxlen
= sizeof(int),
1762 .proc_handler
= proc_dointvec
,
1766 #ifdef CONFIG_FILE_LOCKING
1768 .procname
= "lease-break-time",
1769 .data
= &lease_break_time
,
1770 .maxlen
= sizeof(int),
1772 .proc_handler
= proc_dointvec
,
1777 .procname
= "aio-nr",
1779 .maxlen
= sizeof(aio_nr
),
1781 .proc_handler
= proc_doulongvec_minmax
,
1784 .procname
= "aio-max-nr",
1785 .data
= &aio_max_nr
,
1786 .maxlen
= sizeof(aio_max_nr
),
1788 .proc_handler
= proc_doulongvec_minmax
,
1790 #endif /* CONFIG_AIO */
1791 #ifdef CONFIG_INOTIFY_USER
1793 .procname
= "inotify",
1795 .child
= inotify_table
,
1800 .procname
= "epoll",
1802 .child
= epoll_table
,
1807 .procname
= "protected_symlinks",
1808 .data
= &sysctl_protected_symlinks
,
1809 .maxlen
= sizeof(int),
1811 .proc_handler
= proc_dointvec_minmax
,
1816 .procname
= "protected_hardlinks",
1817 .data
= &sysctl_protected_hardlinks
,
1818 .maxlen
= sizeof(int),
1820 .proc_handler
= proc_dointvec_minmax
,
1825 .procname
= "suid_dumpable",
1826 .data
= &suid_dumpable
,
1827 .maxlen
= sizeof(int),
1829 .proc_handler
= proc_dointvec_minmax_coredump
,
1833 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1835 .procname
= "binfmt_misc",
1837 .child
= sysctl_mount_point
,
1841 .procname
= "pipe-max-size",
1842 .data
= &pipe_max_size
,
1843 .maxlen
= sizeof(int),
1845 .proc_handler
= &pipe_proc_fn
,
1846 .extra1
= &pipe_min_size
,
1849 .procname
= "pipe-user-pages-hard",
1850 .data
= &pipe_user_pages_hard
,
1851 .maxlen
= sizeof(pipe_user_pages_hard
),
1853 .proc_handler
= proc_doulongvec_minmax
,
1856 .procname
= "pipe-user-pages-soft",
1857 .data
= &pipe_user_pages_soft
,
1858 .maxlen
= sizeof(pipe_user_pages_soft
),
1860 .proc_handler
= proc_doulongvec_minmax
,
1863 .procname
= "mount-max",
1864 .data
= &sysctl_mount_max
,
1865 .maxlen
= sizeof(unsigned int),
1867 .proc_handler
= proc_dointvec_minmax
,
1873 static struct ctl_table debug_table
[] = {
1874 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1876 .procname
= "exception-trace",
1877 .data
= &show_unhandled_signals
,
1878 .maxlen
= sizeof(int),
1880 .proc_handler
= proc_dointvec
1883 #if defined(CONFIG_OPTPROBES)
1885 .procname
= "kprobes-optimization",
1886 .data
= &sysctl_kprobes_optimization
,
1887 .maxlen
= sizeof(int),
1889 .proc_handler
= proc_kprobes_optimization_handler
,
1897 static struct ctl_table dev_table
[] = {
1901 int __init
sysctl_init(void)
1903 struct ctl_table_header
*hdr
;
1905 hdr
= register_sysctl_table(sysctl_base_table
);
1906 kmemleak_not_leak(hdr
);
1910 #endif /* CONFIG_SYSCTL */
1916 #ifdef CONFIG_PROC_SYSCTL
1918 static int _proc_do_string(char *data
, int maxlen
, int write
,
1919 char __user
*buffer
,
1920 size_t *lenp
, loff_t
*ppos
)
1926 if (!data
|| !maxlen
|| !*lenp
) {
1932 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1933 /* Only continue writes not past the end of buffer. */
1935 if (len
> maxlen
- 1)
1942 /* Start writing from beginning of buffer. */
1948 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1949 if (get_user(c
, p
++))
1951 if (c
== 0 || c
== '\n')
1972 if (copy_to_user(buffer
, data
, len
))
1975 if (put_user('\n', buffer
+ len
))
1985 static void warn_sysctl_write(struct ctl_table
*table
)
1987 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1988 "This will not be supported in the future. To silence this\n"
1989 "warning, set kernel.sysctl_writes_strict = -1\n",
1990 current
->comm
, table
->procname
);
1994 * proc_dostring - read a string sysctl
1995 * @table: the sysctl table
1996 * @write: %TRUE if this is a write to the sysctl file
1997 * @buffer: the user buffer
1998 * @lenp: the size of the user buffer
1999 * @ppos: file position
2001 * Reads/writes a string from/to the user buffer. If the kernel
2002 * buffer provided is not large enough to hold the string, the
2003 * string is truncated. The copied string is %NULL-terminated.
2004 * If the string is being read by the user process, it is copied
2005 * and a newline '\n' is added. It is truncated if the buffer is
2008 * Returns 0 on success.
2010 int proc_dostring(struct ctl_table
*table
, int write
,
2011 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2013 if (write
&& *ppos
&& sysctl_writes_strict
== SYSCTL_WRITES_WARN
)
2014 warn_sysctl_write(table
);
2016 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2017 (char __user
*)buffer
, lenp
, ppos
);
2020 static size_t proc_skip_spaces(char **buf
)
2023 char *tmp
= skip_spaces(*buf
);
2029 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2039 #define TMPBUFLEN 22
2041 * proc_get_long - reads an ASCII formatted integer from a user buffer
2043 * @buf: a kernel buffer
2044 * @size: size of the kernel buffer
2045 * @val: this is where the number will be stored
2046 * @neg: set to %TRUE if number is negative
2047 * @perm_tr: a vector which contains the allowed trailers
2048 * @perm_tr_len: size of the perm_tr vector
2049 * @tr: pointer to store the trailer character
2051 * In case of success %0 is returned and @buf and @size are updated with
2052 * the amount of bytes read. If @tr is non-NULL and a trailing
2053 * character exists (size is non-zero after returning from this
2054 * function), @tr is updated with the trailing character.
2056 static int proc_get_long(char **buf
, size_t *size
,
2057 unsigned long *val
, bool *neg
,
2058 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2061 char *p
, tmp
[TMPBUFLEN
];
2067 if (len
> TMPBUFLEN
- 1)
2068 len
= TMPBUFLEN
- 1;
2070 memcpy(tmp
, *buf
, len
);
2074 if (*p
== '-' && *size
> 1) {
2082 *val
= simple_strtoul(p
, &p
, 0);
2086 /* We don't know if the next char is whitespace thus we may accept
2087 * invalid integers (e.g. 1234...a) or two integers instead of one
2088 * (e.g. 123...1). So lets not allow such large numbers. */
2089 if (len
== TMPBUFLEN
- 1)
2092 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2095 if (tr
&& (len
< *size
))
2105 * proc_put_long - converts an integer to a decimal ASCII formatted string
2107 * @buf: the user buffer
2108 * @size: the size of the user buffer
2109 * @val: the integer to be converted
2110 * @neg: sign of the number, %TRUE for negative
2112 * In case of success %0 is returned and @buf and @size are updated with
2113 * the amount of bytes written.
2115 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2119 char tmp
[TMPBUFLEN
], *p
= tmp
;
2121 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2125 if (copy_to_user(*buf
, tmp
, len
))
2133 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2136 char __user
**buffer
= (char __user
**)buf
;
2137 if (put_user(c
, *buffer
))
2139 (*size
)--, (*buffer
)++;
2145 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2147 int write
, void *data
)
2151 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2155 if (*lvalp
> (unsigned long) INT_MAX
)
2163 *lvalp
= -(unsigned long)val
;
2166 *lvalp
= (unsigned long)val
;
2172 static int do_proc_douintvec_conv(bool *negp
, unsigned long *lvalp
,
2174 int write
, void *data
)
2179 if (*lvalp
> UINT_MAX
)
2183 unsigned int val
= *valp
;
2185 *lvalp
= (unsigned long)val
;
2190 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2192 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2193 int write
, void __user
*buffer
,
2194 size_t *lenp
, loff_t
*ppos
,
2195 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2196 int write
, void *data
),
2199 int *i
, vleft
, first
= 1, err
= 0;
2200 unsigned long page
= 0;
2204 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2209 i
= (int *) tbl_data
;
2210 vleft
= table
->maxlen
/ sizeof(*i
);
2214 conv
= do_proc_dointvec_conv
;
2218 switch (sysctl_writes_strict
) {
2219 case SYSCTL_WRITES_STRICT
:
2221 case SYSCTL_WRITES_WARN
:
2222 warn_sysctl_write(table
);
2229 if (left
> PAGE_SIZE
- 1)
2230 left
= PAGE_SIZE
- 1;
2231 page
= __get_free_page(GFP_TEMPORARY
);
2232 kbuf
= (char *) page
;
2235 if (copy_from_user(kbuf
, buffer
, left
)) {
2242 for (; left
&& vleft
--; i
++, first
=0) {
2247 left
-= proc_skip_spaces(&kbuf
);
2251 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
2253 sizeof(proc_wspace_sep
), NULL
);
2256 if (conv(&neg
, &lval
, i
, 1, data
)) {
2261 if (conv(&neg
, &lval
, i
, 0, data
)) {
2266 err
= proc_put_char(&buffer
, &left
, '\t');
2269 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2275 if (!write
&& !first
&& left
&& !err
)
2276 err
= proc_put_char(&buffer
, &left
, '\n');
2277 if (write
&& !err
&& left
)
2278 left
-= proc_skip_spaces(&kbuf
);
2283 return err
? : -EINVAL
;
2291 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2292 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2293 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2294 int write
, void *data
),
2297 return __do_proc_dointvec(table
->data
, table
, write
,
2298 buffer
, lenp
, ppos
, conv
, data
);
2302 * proc_dointvec - read a vector of integers
2303 * @table: the sysctl table
2304 * @write: %TRUE if this is a write to the sysctl file
2305 * @buffer: the user buffer
2306 * @lenp: the size of the user buffer
2307 * @ppos: file position
2309 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2310 * values from/to the user buffer, treated as an ASCII string.
2312 * Returns 0 on success.
2314 int proc_dointvec(struct ctl_table
*table
, int write
,
2315 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2317 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2321 * proc_douintvec - read a vector of unsigned integers
2322 * @table: the sysctl table
2323 * @write: %TRUE if this is a write to the sysctl file
2324 * @buffer: the user buffer
2325 * @lenp: the size of the user buffer
2326 * @ppos: file position
2328 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2329 * values from/to the user buffer, treated as an ASCII string.
2331 * Returns 0 on success.
2333 int proc_douintvec(struct ctl_table
*table
, int write
,
2334 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2336 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2337 do_proc_douintvec_conv
, NULL
);
2341 * Taint values can only be increased
2342 * This means we can safely use a temporary.
2344 static int proc_taint(struct ctl_table
*table
, int write
,
2345 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2348 unsigned long tmptaint
= get_taint();
2351 if (write
&& !capable(CAP_SYS_ADMIN
))
2356 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2362 * Poor man's atomic or. Not worth adding a primitive
2363 * to everyone's atomic.h for this
2366 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2367 if ((tmptaint
>> i
) & 1)
2368 add_taint(i
, LOCKDEP_STILL_OK
);
2375 #ifdef CONFIG_PRINTK
2376 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2377 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2379 if (write
&& !capable(CAP_SYS_ADMIN
))
2382 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2386 struct do_proc_dointvec_minmax_conv_param
{
2391 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2393 int write
, void *data
)
2395 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2397 int val
= *negp
? -*lvalp
: *lvalp
;
2398 if ((param
->min
&& *param
->min
> val
) ||
2399 (param
->max
&& *param
->max
< val
))
2406 *lvalp
= -(unsigned long)val
;
2409 *lvalp
= (unsigned long)val
;
2416 * proc_dointvec_minmax - read a vector of integers with min/max values
2417 * @table: the sysctl table
2418 * @write: %TRUE if this is a write to the sysctl file
2419 * @buffer: the user buffer
2420 * @lenp: the size of the user buffer
2421 * @ppos: file position
2423 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2424 * values from/to the user buffer, treated as an ASCII string.
2426 * This routine will ensure the values are within the range specified by
2427 * table->extra1 (min) and table->extra2 (max).
2429 * Returns 0 on success.
2431 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2432 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2434 struct do_proc_dointvec_minmax_conv_param param
= {
2435 .min
= (int *) table
->extra1
,
2436 .max
= (int *) table
->extra2
,
2438 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2439 do_proc_dointvec_minmax_conv
, ¶m
);
2442 static void validate_coredump_safety(void)
2444 #ifdef CONFIG_COREDUMP
2445 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2446 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2447 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2448 "suid_dumpable=2. Pipe handler or fully qualified "\
2449 "core dump path required.\n");
2454 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2455 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2457 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2459 validate_coredump_safety();
2463 #ifdef CONFIG_COREDUMP
2464 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2465 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2467 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2469 validate_coredump_safety();
2474 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2475 void __user
*buffer
,
2476 size_t *lenp
, loff_t
*ppos
,
2477 unsigned long convmul
,
2478 unsigned long convdiv
)
2480 unsigned long *i
, *min
, *max
;
2481 int vleft
, first
= 1, err
= 0;
2482 unsigned long page
= 0;
2486 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2491 i
= (unsigned long *) data
;
2492 min
= (unsigned long *) table
->extra1
;
2493 max
= (unsigned long *) table
->extra2
;
2494 vleft
= table
->maxlen
/ sizeof(unsigned long);
2499 switch (sysctl_writes_strict
) {
2500 case SYSCTL_WRITES_STRICT
:
2502 case SYSCTL_WRITES_WARN
:
2503 warn_sysctl_write(table
);
2510 if (left
> PAGE_SIZE
- 1)
2511 left
= PAGE_SIZE
- 1;
2512 page
= __get_free_page(GFP_TEMPORARY
);
2513 kbuf
= (char *) page
;
2516 if (copy_from_user(kbuf
, buffer
, left
)) {
2523 for (; left
&& vleft
--; i
++, first
= 0) {
2529 left
-= proc_skip_spaces(&kbuf
);
2531 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2533 sizeof(proc_wspace_sep
), NULL
);
2538 val
= convmul
* val
/ convdiv
;
2539 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2543 val
= convdiv
* (*i
) / convmul
;
2545 err
= proc_put_char(&buffer
, &left
, '\t');
2549 err
= proc_put_long(&buffer
, &left
, val
, false);
2555 if (!write
&& !first
&& left
&& !err
)
2556 err
= proc_put_char(&buffer
, &left
, '\n');
2558 left
-= proc_skip_spaces(&kbuf
);
2563 return err
? : -EINVAL
;
2571 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2572 void __user
*buffer
,
2573 size_t *lenp
, loff_t
*ppos
,
2574 unsigned long convmul
,
2575 unsigned long convdiv
)
2577 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2578 buffer
, lenp
, ppos
, convmul
, convdiv
);
2582 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2583 * @table: the sysctl table
2584 * @write: %TRUE if this is a write to the sysctl file
2585 * @buffer: the user buffer
2586 * @lenp: the size of the user buffer
2587 * @ppos: file position
2589 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2590 * values from/to the user buffer, treated as an ASCII string.
2592 * This routine will ensure the values are within the range specified by
2593 * table->extra1 (min) and table->extra2 (max).
2595 * Returns 0 on success.
2597 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2598 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2600 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2604 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2605 * @table: the sysctl table
2606 * @write: %TRUE if this is a write to the sysctl file
2607 * @buffer: the user buffer
2608 * @lenp: the size of the user buffer
2609 * @ppos: file position
2611 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2612 * values from/to the user buffer, treated as an ASCII string. The values
2613 * are treated as milliseconds, and converted to jiffies when they are stored.
2615 * This routine will ensure the values are within the range specified by
2616 * table->extra1 (min) and table->extra2 (max).
2618 * Returns 0 on success.
2620 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2621 void __user
*buffer
,
2622 size_t *lenp
, loff_t
*ppos
)
2624 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2625 lenp
, ppos
, HZ
, 1000l);
2629 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2631 int write
, void *data
)
2634 if (*lvalp
> LONG_MAX
/ HZ
)
2636 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2642 lval
= -(unsigned long)val
;
2645 lval
= (unsigned long)val
;
2652 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2654 int write
, void *data
)
2657 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2659 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2665 lval
= -(unsigned long)val
;
2668 lval
= (unsigned long)val
;
2670 *lvalp
= jiffies_to_clock_t(lval
);
2675 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2677 int write
, void *data
)
2680 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2690 lval
= -(unsigned long)val
;
2693 lval
= (unsigned long)val
;
2695 *lvalp
= jiffies_to_msecs(lval
);
2701 * proc_dointvec_jiffies - read a vector of integers as seconds
2702 * @table: the sysctl table
2703 * @write: %TRUE if this is a write to the sysctl file
2704 * @buffer: the user buffer
2705 * @lenp: the size of the user buffer
2706 * @ppos: file position
2708 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2709 * values from/to the user buffer, treated as an ASCII string.
2710 * The values read are assumed to be in seconds, and are converted into
2713 * Returns 0 on success.
2715 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2716 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2718 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2719 do_proc_dointvec_jiffies_conv
,NULL
);
2723 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2724 * @table: the sysctl table
2725 * @write: %TRUE if this is a write to the sysctl file
2726 * @buffer: the user buffer
2727 * @lenp: the size of the user buffer
2728 * @ppos: pointer to the file position
2730 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2731 * values from/to the user buffer, treated as an ASCII string.
2732 * The values read are assumed to be in 1/USER_HZ seconds, and
2733 * are converted into jiffies.
2735 * Returns 0 on success.
2737 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2738 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2740 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2741 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2745 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2746 * @table: the sysctl table
2747 * @write: %TRUE if this is a write to the sysctl file
2748 * @buffer: the user buffer
2749 * @lenp: the size of the user buffer
2750 * @ppos: file position
2751 * @ppos: the current position in the file
2753 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2754 * values from/to the user buffer, treated as an ASCII string.
2755 * The values read are assumed to be in 1/1000 seconds, and
2756 * are converted into jiffies.
2758 * Returns 0 on success.
2760 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2761 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2763 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2764 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2767 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2768 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2770 struct pid
*new_pid
;
2774 tmp
= pid_vnr(cad_pid
);
2776 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2777 lenp
, ppos
, NULL
, NULL
);
2781 new_pid
= find_get_pid(tmp
);
2785 put_pid(xchg(&cad_pid
, new_pid
));
2790 * proc_do_large_bitmap - read/write from/to a large bitmap
2791 * @table: the sysctl table
2792 * @write: %TRUE if this is a write to the sysctl file
2793 * @buffer: the user buffer
2794 * @lenp: the size of the user buffer
2795 * @ppos: file position
2797 * The bitmap is stored at table->data and the bitmap length (in bits)
2800 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2801 * large bitmaps may be represented in a compact manner. Writing into
2802 * the file will clear the bitmap then update it with the given input.
2804 * Returns 0 on success.
2806 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2807 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2811 size_t left
= *lenp
;
2812 unsigned long bitmap_len
= table
->maxlen
;
2813 unsigned long *bitmap
= *(unsigned long **) table
->data
;
2814 unsigned long *tmp_bitmap
= NULL
;
2815 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2817 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2823 unsigned long page
= 0;
2826 if (left
> PAGE_SIZE
- 1)
2827 left
= PAGE_SIZE
- 1;
2829 page
= __get_free_page(GFP_TEMPORARY
);
2830 kbuf
= (char *) page
;
2833 if (copy_from_user(kbuf
, buffer
, left
)) {
2839 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2845 proc_skip_char(&kbuf
, &left
, '\n');
2846 while (!err
&& left
) {
2847 unsigned long val_a
, val_b
;
2850 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2854 if (val_a
>= bitmap_len
|| neg
) {
2866 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2867 &neg
, tr_b
, sizeof(tr_b
),
2871 if (val_b
>= bitmap_len
|| neg
||
2882 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2884 proc_skip_char(&kbuf
, &left
, '\n');
2888 unsigned long bit_a
, bit_b
= 0;
2891 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2892 if (bit_a
>= bitmap_len
)
2894 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2898 err
= proc_put_char(&buffer
, &left
, ',');
2902 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2905 if (bit_a
!= bit_b
) {
2906 err
= proc_put_char(&buffer
, &left
, '-');
2909 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2917 err
= proc_put_char(&buffer
, &left
, '\n');
2923 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2925 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2937 #else /* CONFIG_PROC_SYSCTL */
2939 int proc_dostring(struct ctl_table
*table
, int write
,
2940 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2945 int proc_dointvec(struct ctl_table
*table
, int write
,
2946 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2951 int proc_douintvec(struct ctl_table
*table
, int write
,
2952 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2957 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2958 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2963 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2964 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2969 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2970 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2975 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2976 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2981 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2982 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2987 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2988 void __user
*buffer
,
2989 size_t *lenp
, loff_t
*ppos
)
2995 #endif /* CONFIG_PROC_SYSCTL */
2998 * No sense putting this after each symbol definition, twice,
2999 * exception granted :-)
3001 EXPORT_SYMBOL(proc_dointvec
);
3002 EXPORT_SYMBOL(proc_douintvec
);
3003 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3004 EXPORT_SYMBOL(proc_dointvec_minmax
);
3005 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3006 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3007 EXPORT_SYMBOL(proc_dostring
);
3008 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3009 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);