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/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
76 #include <asm/stacktrace.h>
80 #include <asm/setup.h>
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
91 #ifdef CONFIG_CHR_DEV_SG
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
99 #if defined(CONFIG_SYSCTL)
101 /* External variables not in a header file. */
102 extern int suid_dumpable
;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid
;
105 extern char core_pattern
[];
106 extern unsigned int core_pipe_limit
;
108 #ifdef CONFIG_USER_NS
109 extern int unprivileged_userns_clone
;
112 extern int pid_max_min
, pid_max_max
;
113 extern int percpu_pagelist_fraction
;
114 extern int latencytop_enabled
;
115 extern unsigned int sysctl_nr_open_min
, sysctl_nr_open_max
;
117 extern int sysctl_nr_trim_pages
;
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty
= 60;
125 static int __maybe_unused neg_one
= -1;
128 static int __maybe_unused one
= 1;
129 static int __maybe_unused two
= 2;
130 static int __maybe_unused four
= 4;
131 static unsigned long one_ul
= 1;
132 static int one_hundred
= 100;
133 static int one_thousand
= 1000;
135 static int ten_thousand
= 10000;
137 #ifdef CONFIG_PERF_EVENTS
138 static int six_hundred_forty_kb
= 640 * 1024;
141 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
142 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
144 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
145 static int maxolduid
= 65535;
146 static int minolduid
;
148 static int ngroups_max
= NGROUPS_MAX
;
149 static const int cap_last_cap
= CAP_LAST_CAP
;
151 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
152 #ifdef CONFIG_DETECT_HUNG_TASK
153 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
156 #ifdef CONFIG_INOTIFY_USER
157 #include <linux/inotify.h>
163 extern int pwrsw_enabled
;
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
167 extern int unaligned_enabled
;
171 extern int unaligned_dump_stack
;
174 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
175 extern int no_unaligned_warning
;
178 #ifdef CONFIG_PROC_SYSCTL
181 * enum sysctl_writes_mode - supported sysctl write modes
183 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
184 * to be written, and multiple writes on the same sysctl file descriptor
185 * will rewrite the sysctl value, regardless of file position. No warning
186 * is issued when the initial position is not 0.
187 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
189 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
190 * file position 0 and the value must be fully contained in the buffer
191 * sent to the write syscall. If dealing with strings respect the file
192 * position, but restrict this to the max length of the buffer, anything
193 * passed the max lenght will be ignored. Multiple writes will append
196 * These write modes control how current file position affects the behavior of
197 * updating sysctl values through the proc interface on each write.
199 enum sysctl_writes_mode
{
200 SYSCTL_WRITES_LEGACY
= -1,
201 SYSCTL_WRITES_WARN
= 0,
202 SYSCTL_WRITES_STRICT
= 1,
205 static enum sysctl_writes_mode sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
207 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
208 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
209 static int proc_taint(struct ctl_table
*table
, int write
,
210 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
214 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
215 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
218 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
219 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
220 #ifdef CONFIG_COREDUMP
221 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
222 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
225 #ifdef CONFIG_MAGIC_SYSRQ
226 /* Note: sysrq code uses it's own private copy */
227 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
229 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
230 void __user
*buffer
, size_t *lenp
,
235 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
240 sysrq_toggle_support(__sysrq_enabled
);
247 static struct ctl_table kern_table
[];
248 static struct ctl_table vm_table
[];
249 static struct ctl_table fs_table
[];
250 static struct ctl_table debug_table
[];
251 static struct ctl_table dev_table
[];
252 extern struct ctl_table random_table
[];
254 extern struct ctl_table epoll_table
[];
257 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
258 int sysctl_legacy_va_layout
;
261 /* The default sysctl tables: */
263 static struct ctl_table sysctl_base_table
[] = {
265 .procname
= "kernel",
282 .child
= debug_table
,
292 #ifdef CONFIG_SCHED_DEBUG
293 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
294 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
295 static int min_wakeup_granularity_ns
; /* 0 usecs */
296 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
298 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
299 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
300 #endif /* CONFIG_SMP */
301 #endif /* CONFIG_SCHED_DEBUG */
303 #ifdef CONFIG_COMPACTION
304 static int min_extfrag_threshold
;
305 static int max_extfrag_threshold
= 1000;
308 static struct ctl_table kern_table
[] = {
310 .procname
= "sched_child_runs_first",
311 .data
= &sysctl_sched_child_runs_first
,
312 .maxlen
= sizeof(unsigned int),
314 .proc_handler
= proc_dointvec
,
316 #ifdef CONFIG_SCHED_DEBUG
318 .procname
= "sched_min_granularity_ns",
319 .data
= &sysctl_sched_min_granularity
,
320 .maxlen
= sizeof(unsigned int),
322 .proc_handler
= sched_proc_update_handler
,
323 .extra1
= &min_sched_granularity_ns
,
324 .extra2
= &max_sched_granularity_ns
,
327 .procname
= "sched_latency_ns",
328 .data
= &sysctl_sched_latency
,
329 .maxlen
= sizeof(unsigned int),
331 .proc_handler
= sched_proc_update_handler
,
332 .extra1
= &min_sched_granularity_ns
,
333 .extra2
= &max_sched_granularity_ns
,
336 .procname
= "sched_wakeup_granularity_ns",
337 .data
= &sysctl_sched_wakeup_granularity
,
338 .maxlen
= sizeof(unsigned int),
340 .proc_handler
= sched_proc_update_handler
,
341 .extra1
= &min_wakeup_granularity_ns
,
342 .extra2
= &max_wakeup_granularity_ns
,
346 .procname
= "sched_tunable_scaling",
347 .data
= &sysctl_sched_tunable_scaling
,
348 .maxlen
= sizeof(enum sched_tunable_scaling
),
350 .proc_handler
= sched_proc_update_handler
,
351 .extra1
= &min_sched_tunable_scaling
,
352 .extra2
= &max_sched_tunable_scaling
,
355 .procname
= "sched_migration_cost_ns",
356 .data
= &sysctl_sched_migration_cost
,
357 .maxlen
= sizeof(unsigned int),
359 .proc_handler
= proc_dointvec
,
362 .procname
= "sched_nr_migrate",
363 .data
= &sysctl_sched_nr_migrate
,
364 .maxlen
= sizeof(unsigned int),
366 .proc_handler
= proc_dointvec
,
369 .procname
= "sched_time_avg_ms",
370 .data
= &sysctl_sched_time_avg
,
371 .maxlen
= sizeof(unsigned int),
373 .proc_handler
= proc_dointvec_minmax
,
376 #ifdef CONFIG_SCHEDSTATS
378 .procname
= "sched_schedstats",
380 .maxlen
= sizeof(unsigned int),
382 .proc_handler
= sysctl_schedstats
,
386 #endif /* CONFIG_SCHEDSTATS */
387 #endif /* CONFIG_SMP */
388 #ifdef CONFIG_NUMA_BALANCING
390 .procname
= "numa_balancing_scan_delay_ms",
391 .data
= &sysctl_numa_balancing_scan_delay
,
392 .maxlen
= sizeof(unsigned int),
394 .proc_handler
= proc_dointvec
,
397 .procname
= "numa_balancing_scan_period_min_ms",
398 .data
= &sysctl_numa_balancing_scan_period_min
,
399 .maxlen
= sizeof(unsigned int),
401 .proc_handler
= proc_dointvec
,
404 .procname
= "numa_balancing_scan_period_max_ms",
405 .data
= &sysctl_numa_balancing_scan_period_max
,
406 .maxlen
= sizeof(unsigned int),
408 .proc_handler
= proc_dointvec
,
411 .procname
= "numa_balancing_scan_size_mb",
412 .data
= &sysctl_numa_balancing_scan_size
,
413 .maxlen
= sizeof(unsigned int),
415 .proc_handler
= proc_dointvec_minmax
,
419 .procname
= "numa_balancing",
420 .data
= NULL
, /* filled in by handler */
421 .maxlen
= sizeof(unsigned int),
423 .proc_handler
= sysctl_numa_balancing
,
427 #endif /* CONFIG_NUMA_BALANCING */
428 #endif /* CONFIG_SCHED_DEBUG */
430 .procname
= "sched_rt_period_us",
431 .data
= &sysctl_sched_rt_period
,
432 .maxlen
= sizeof(unsigned int),
434 .proc_handler
= sched_rt_handler
,
437 .procname
= "sched_rt_runtime_us",
438 .data
= &sysctl_sched_rt_runtime
,
439 .maxlen
= sizeof(int),
441 .proc_handler
= sched_rt_handler
,
444 .procname
= "sched_rr_timeslice_ms",
445 .data
= &sysctl_sched_rr_timeslice
,
446 .maxlen
= sizeof(int),
448 .proc_handler
= sched_rr_handler
,
450 #ifdef CONFIG_SCHED_AUTOGROUP
452 .procname
= "sched_autogroup_enabled",
453 .data
= &sysctl_sched_autogroup_enabled
,
454 .maxlen
= sizeof(unsigned int),
456 .proc_handler
= proc_dointvec_minmax
,
461 #ifdef CONFIG_CFS_BANDWIDTH
463 .procname
= "sched_cfs_bandwidth_slice_us",
464 .data
= &sysctl_sched_cfs_bandwidth_slice
,
465 .maxlen
= sizeof(unsigned int),
467 .proc_handler
= proc_dointvec_minmax
,
471 #ifdef CONFIG_PROVE_LOCKING
473 .procname
= "prove_locking",
474 .data
= &prove_locking
,
475 .maxlen
= sizeof(int),
477 .proc_handler
= proc_dointvec
,
480 #ifdef CONFIG_LOCK_STAT
482 .procname
= "lock_stat",
484 .maxlen
= sizeof(int),
486 .proc_handler
= proc_dointvec
,
491 .data
= &panic_timeout
,
492 .maxlen
= sizeof(int),
494 .proc_handler
= proc_dointvec
,
496 #ifdef CONFIG_COREDUMP
498 .procname
= "core_uses_pid",
499 .data
= &core_uses_pid
,
500 .maxlen
= sizeof(int),
502 .proc_handler
= proc_dointvec
,
505 .procname
= "core_pattern",
506 .data
= core_pattern
,
507 .maxlen
= CORENAME_MAX_SIZE
,
509 .proc_handler
= proc_dostring_coredump
,
512 .procname
= "core_pipe_limit",
513 .data
= &core_pipe_limit
,
514 .maxlen
= sizeof(unsigned int),
516 .proc_handler
= proc_dointvec
,
519 #ifdef CONFIG_USER_NS
521 .procname
= "unprivileged_userns_clone",
522 .data
= &unprivileged_userns_clone
,
523 .maxlen
= sizeof(int),
525 .proc_handler
= proc_dointvec
,
528 #ifdef CONFIG_PROC_SYSCTL
530 .procname
= "tainted",
531 .maxlen
= sizeof(long),
533 .proc_handler
= proc_taint
,
536 .procname
= "sysctl_writes_strict",
537 .data
= &sysctl_writes_strict
,
538 .maxlen
= sizeof(int),
540 .proc_handler
= proc_dointvec_minmax
,
545 #ifdef CONFIG_LATENCYTOP
547 .procname
= "latencytop",
548 .data
= &latencytop_enabled
,
549 .maxlen
= sizeof(int),
551 .proc_handler
= sysctl_latencytop
,
554 #ifdef CONFIG_BLK_DEV_INITRD
556 .procname
= "real-root-dev",
557 .data
= &real_root_dev
,
558 .maxlen
= sizeof(int),
560 .proc_handler
= proc_dointvec
,
564 .procname
= "print-fatal-signals",
565 .data
= &print_fatal_signals
,
566 .maxlen
= sizeof(int),
568 .proc_handler
= proc_dointvec
,
572 .procname
= "reboot-cmd",
573 .data
= reboot_command
,
576 .proc_handler
= proc_dostring
,
579 .procname
= "stop-a",
580 .data
= &stop_a_enabled
,
581 .maxlen
= sizeof (int),
583 .proc_handler
= proc_dointvec
,
586 .procname
= "scons-poweroff",
587 .data
= &scons_pwroff
,
588 .maxlen
= sizeof (int),
590 .proc_handler
= proc_dointvec
,
593 #ifdef CONFIG_SPARC64
595 .procname
= "tsb-ratio",
596 .data
= &sysctl_tsb_ratio
,
597 .maxlen
= sizeof (int),
599 .proc_handler
= proc_dointvec
,
604 .procname
= "soft-power",
605 .data
= &pwrsw_enabled
,
606 .maxlen
= sizeof (int),
608 .proc_handler
= proc_dointvec
,
611 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
613 .procname
= "unaligned-trap",
614 .data
= &unaligned_enabled
,
615 .maxlen
= sizeof (int),
617 .proc_handler
= proc_dointvec
,
621 .procname
= "ctrl-alt-del",
623 .maxlen
= sizeof(int),
625 .proc_handler
= proc_dointvec
,
627 #ifdef CONFIG_FUNCTION_TRACER
629 .procname
= "ftrace_enabled",
630 .data
= &ftrace_enabled
,
631 .maxlen
= sizeof(int),
633 .proc_handler
= ftrace_enable_sysctl
,
636 #ifdef CONFIG_STACK_TRACER
638 .procname
= "stack_tracer_enabled",
639 .data
= &stack_tracer_enabled
,
640 .maxlen
= sizeof(int),
642 .proc_handler
= stack_trace_sysctl
,
645 #ifdef CONFIG_TRACING
647 .procname
= "ftrace_dump_on_oops",
648 .data
= &ftrace_dump_on_oops
,
649 .maxlen
= sizeof(int),
651 .proc_handler
= proc_dointvec
,
654 .procname
= "traceoff_on_warning",
655 .data
= &__disable_trace_on_warning
,
656 .maxlen
= sizeof(__disable_trace_on_warning
),
658 .proc_handler
= proc_dointvec
,
661 .procname
= "tracepoint_printk",
662 .data
= &tracepoint_printk
,
663 .maxlen
= sizeof(tracepoint_printk
),
665 .proc_handler
= tracepoint_printk_sysctl
,
668 #ifdef CONFIG_KEXEC_CORE
670 .procname
= "kexec_load_disabled",
671 .data
= &kexec_load_disabled
,
672 .maxlen
= sizeof(int),
674 /* only handle a transition from default "0" to "1" */
675 .proc_handler
= proc_dointvec_minmax
,
680 #ifdef CONFIG_MODULES
682 .procname
= "modprobe",
683 .data
= &modprobe_path
,
684 .maxlen
= KMOD_PATH_LEN
,
686 .proc_handler
= proc_dostring
,
689 .procname
= "modules_disabled",
690 .data
= &modules_disabled
,
691 .maxlen
= sizeof(int),
693 /* only handle a transition from default "0" to "1" */
694 .proc_handler
= proc_dointvec_minmax
,
699 #ifdef CONFIG_UEVENT_HELPER
701 .procname
= "hotplug",
702 .data
= &uevent_helper
,
703 .maxlen
= UEVENT_HELPER_PATH_LEN
,
705 .proc_handler
= proc_dostring
,
708 #ifdef CONFIG_CHR_DEV_SG
710 .procname
= "sg-big-buff",
711 .data
= &sg_big_buff
,
712 .maxlen
= sizeof (int),
714 .proc_handler
= proc_dointvec
,
717 #ifdef CONFIG_BSD_PROCESS_ACCT
721 .maxlen
= 3*sizeof(int),
723 .proc_handler
= proc_dointvec
,
726 #ifdef CONFIG_MAGIC_SYSRQ
729 .data
= &__sysrq_enabled
,
730 .maxlen
= sizeof (int),
732 .proc_handler
= sysrq_sysctl_handler
,
735 #ifdef CONFIG_PROC_SYSCTL
737 .procname
= "cad_pid",
739 .maxlen
= sizeof (int),
741 .proc_handler
= proc_do_cad_pid
,
745 .procname
= "threads-max",
747 .maxlen
= sizeof(int),
749 .proc_handler
= sysctl_max_threads
,
752 .procname
= "random",
754 .child
= random_table
,
757 .procname
= "usermodehelper",
759 .child
= usermodehelper_table
,
762 .procname
= "overflowuid",
763 .data
= &overflowuid
,
764 .maxlen
= sizeof(int),
766 .proc_handler
= proc_dointvec_minmax
,
767 .extra1
= &minolduid
,
768 .extra2
= &maxolduid
,
771 .procname
= "overflowgid",
772 .data
= &overflowgid
,
773 .maxlen
= sizeof(int),
775 .proc_handler
= proc_dointvec_minmax
,
776 .extra1
= &minolduid
,
777 .extra2
= &maxolduid
,
780 #ifdef CONFIG_MATHEMU
782 .procname
= "ieee_emulation_warnings",
783 .data
= &sysctl_ieee_emulation_warnings
,
784 .maxlen
= sizeof(int),
786 .proc_handler
= proc_dointvec
,
790 .procname
= "userprocess_debug",
791 .data
= &show_unhandled_signals
,
792 .maxlen
= sizeof(int),
794 .proc_handler
= proc_dointvec
,
798 .procname
= "pid_max",
800 .maxlen
= sizeof (int),
802 .proc_handler
= proc_dointvec_minmax
,
803 .extra1
= &pid_max_min
,
804 .extra2
= &pid_max_max
,
807 .procname
= "panic_on_oops",
808 .data
= &panic_on_oops
,
809 .maxlen
= sizeof(int),
811 .proc_handler
= proc_dointvec
,
813 #if defined CONFIG_PRINTK
815 .procname
= "printk",
816 .data
= &console_loglevel
,
817 .maxlen
= 4*sizeof(int),
819 .proc_handler
= proc_dointvec
,
822 .procname
= "printk_ratelimit",
823 .data
= &printk_ratelimit_state
.interval
,
824 .maxlen
= sizeof(int),
826 .proc_handler
= proc_dointvec_jiffies
,
829 .procname
= "printk_ratelimit_burst",
830 .data
= &printk_ratelimit_state
.burst
,
831 .maxlen
= sizeof(int),
833 .proc_handler
= proc_dointvec
,
836 .procname
= "printk_delay",
837 .data
= &printk_delay_msec
,
838 .maxlen
= sizeof(int),
840 .proc_handler
= proc_dointvec_minmax
,
842 .extra2
= &ten_thousand
,
845 .procname
= "printk_devkmsg",
846 .data
= devkmsg_log_str
,
847 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
849 .proc_handler
= devkmsg_sysctl_set_loglvl
,
852 .procname
= "dmesg_restrict",
853 .data
= &dmesg_restrict
,
854 .maxlen
= sizeof(int),
856 .proc_handler
= proc_dointvec_minmax_sysadmin
,
861 .procname
= "kptr_restrict",
862 .data
= &kptr_restrict
,
863 .maxlen
= sizeof(int),
865 .proc_handler
= proc_dointvec_minmax_sysadmin
,
871 .procname
= "ngroups_max",
872 .data
= &ngroups_max
,
873 .maxlen
= sizeof (int),
875 .proc_handler
= proc_dointvec
,
878 .procname
= "cap_last_cap",
879 .data
= (void *)&cap_last_cap
,
880 .maxlen
= sizeof(int),
882 .proc_handler
= proc_dointvec
,
884 #if defined(CONFIG_LOCKUP_DETECTOR)
886 .procname
= "watchdog",
887 .data
= &watchdog_user_enabled
,
888 .maxlen
= sizeof (int),
890 .proc_handler
= proc_watchdog
,
895 .procname
= "watchdog_thresh",
896 .data
= &watchdog_thresh
,
897 .maxlen
= sizeof(int),
899 .proc_handler
= proc_watchdog_thresh
,
904 .procname
= "nmi_watchdog",
905 .data
= &nmi_watchdog_enabled
,
906 .maxlen
= sizeof (int),
908 .proc_handler
= proc_nmi_watchdog
,
910 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
917 .procname
= "watchdog_cpumask",
918 .data
= &watchdog_cpumask_bits
,
921 .proc_handler
= proc_watchdog_cpumask
,
923 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
925 .procname
= "soft_watchdog",
926 .data
= &soft_watchdog_enabled
,
927 .maxlen
= sizeof (int),
929 .proc_handler
= proc_soft_watchdog
,
934 .procname
= "softlockup_panic",
935 .data
= &softlockup_panic
,
936 .maxlen
= sizeof(int),
938 .proc_handler
= proc_dointvec_minmax
,
944 .procname
= "softlockup_all_cpu_backtrace",
945 .data
= &sysctl_softlockup_all_cpu_backtrace
,
946 .maxlen
= sizeof(int),
948 .proc_handler
= proc_dointvec_minmax
,
952 #endif /* CONFIG_SMP */
954 #ifdef CONFIG_HARDLOCKUP_DETECTOR
956 .procname
= "hardlockup_panic",
957 .data
= &hardlockup_panic
,
958 .maxlen
= sizeof(int),
960 .proc_handler
= proc_dointvec_minmax
,
966 .procname
= "hardlockup_all_cpu_backtrace",
967 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
968 .maxlen
= sizeof(int),
970 .proc_handler
= proc_dointvec_minmax
,
974 #endif /* CONFIG_SMP */
978 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
980 .procname
= "unknown_nmi_panic",
981 .data
= &unknown_nmi_panic
,
982 .maxlen
= sizeof (int),
984 .proc_handler
= proc_dointvec
,
987 #if defined(CONFIG_X86)
989 .procname
= "panic_on_unrecovered_nmi",
990 .data
= &panic_on_unrecovered_nmi
,
991 .maxlen
= sizeof(int),
993 .proc_handler
= proc_dointvec
,
996 .procname
= "panic_on_io_nmi",
997 .data
= &panic_on_io_nmi
,
998 .maxlen
= sizeof(int),
1000 .proc_handler
= proc_dointvec
,
1002 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1004 .procname
= "panic_on_stackoverflow",
1005 .data
= &sysctl_panic_on_stackoverflow
,
1006 .maxlen
= sizeof(int),
1008 .proc_handler
= proc_dointvec
,
1012 .procname
= "bootloader_type",
1013 .data
= &bootloader_type
,
1014 .maxlen
= sizeof (int),
1016 .proc_handler
= proc_dointvec
,
1019 .procname
= "bootloader_version",
1020 .data
= &bootloader_version
,
1021 .maxlen
= sizeof (int),
1023 .proc_handler
= proc_dointvec
,
1026 .procname
= "io_delay_type",
1027 .data
= &io_delay_type
,
1028 .maxlen
= sizeof(int),
1030 .proc_handler
= proc_dointvec
,
1033 #if defined(CONFIG_MMU)
1035 .procname
= "randomize_va_space",
1036 .data
= &randomize_va_space
,
1037 .maxlen
= sizeof(int),
1039 .proc_handler
= proc_dointvec
,
1042 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1044 .procname
= "spin_retry",
1045 .data
= &spin_retry
,
1046 .maxlen
= sizeof (int),
1048 .proc_handler
= proc_dointvec
,
1051 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1053 .procname
= "acpi_video_flags",
1054 .data
= &acpi_realmode_flags
,
1055 .maxlen
= sizeof (unsigned long),
1057 .proc_handler
= proc_doulongvec_minmax
,
1060 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1062 .procname
= "ignore-unaligned-usertrap",
1063 .data
= &no_unaligned_warning
,
1064 .maxlen
= sizeof (int),
1066 .proc_handler
= proc_dointvec
,
1071 .procname
= "unaligned-dump-stack",
1072 .data
= &unaligned_dump_stack
,
1073 .maxlen
= sizeof (int),
1075 .proc_handler
= proc_dointvec
,
1078 #ifdef CONFIG_DETECT_HUNG_TASK
1080 .procname
= "hung_task_panic",
1081 .data
= &sysctl_hung_task_panic
,
1082 .maxlen
= sizeof(int),
1084 .proc_handler
= proc_dointvec_minmax
,
1089 .procname
= "hung_task_check_count",
1090 .data
= &sysctl_hung_task_check_count
,
1091 .maxlen
= sizeof(int),
1093 .proc_handler
= proc_dointvec_minmax
,
1097 .procname
= "hung_task_timeout_secs",
1098 .data
= &sysctl_hung_task_timeout_secs
,
1099 .maxlen
= sizeof(unsigned long),
1101 .proc_handler
= proc_dohung_task_timeout_secs
,
1102 .extra2
= &hung_task_timeout_max
,
1105 .procname
= "hung_task_warnings",
1106 .data
= &sysctl_hung_task_warnings
,
1107 .maxlen
= sizeof(int),
1109 .proc_handler
= proc_dointvec_minmax
,
1113 #ifdef CONFIG_RT_MUTEXES
1115 .procname
= "max_lock_depth",
1116 .data
= &max_lock_depth
,
1117 .maxlen
= sizeof(int),
1119 .proc_handler
= proc_dointvec
,
1123 .procname
= "poweroff_cmd",
1124 .data
= &poweroff_cmd
,
1125 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1127 .proc_handler
= proc_dostring
,
1133 .child
= key_sysctls
,
1136 #ifdef CONFIG_PERF_EVENTS
1138 * User-space scripts rely on the existence of this file
1139 * as a feature check for perf_events being enabled.
1141 * So it's an ABI, do not remove!
1144 .procname
= "perf_event_paranoid",
1145 .data
= &sysctl_perf_event_paranoid
,
1146 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1148 .proc_handler
= proc_dointvec
,
1151 .procname
= "perf_event_mlock_kb",
1152 .data
= &sysctl_perf_event_mlock
,
1153 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1155 .proc_handler
= proc_dointvec
,
1158 .procname
= "perf_event_max_sample_rate",
1159 .data
= &sysctl_perf_event_sample_rate
,
1160 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1162 .proc_handler
= perf_proc_update_handler
,
1166 .procname
= "perf_cpu_time_max_percent",
1167 .data
= &sysctl_perf_cpu_time_max_percent
,
1168 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1170 .proc_handler
= perf_cpu_time_max_percent_handler
,
1172 .extra2
= &one_hundred
,
1175 .procname
= "perf_event_max_stack",
1176 .data
= &sysctl_perf_event_max_stack
,
1177 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1179 .proc_handler
= perf_event_max_stack_handler
,
1181 .extra2
= &six_hundred_forty_kb
,
1184 .procname
= "perf_event_max_contexts_per_stack",
1185 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1186 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1188 .proc_handler
= perf_event_max_stack_handler
,
1190 .extra2
= &one_thousand
,
1193 #ifdef CONFIG_KMEMCHECK
1195 .procname
= "kmemcheck",
1196 .data
= &kmemcheck_enabled
,
1197 .maxlen
= sizeof(int),
1199 .proc_handler
= proc_dointvec
,
1203 .procname
= "panic_on_warn",
1204 .data
= &panic_on_warn
,
1205 .maxlen
= sizeof(int),
1207 .proc_handler
= proc_dointvec_minmax
,
1211 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1213 .procname
= "timer_migration",
1214 .data
= &sysctl_timer_migration
,
1215 .maxlen
= sizeof(unsigned int),
1217 .proc_handler
= timer_migration_handler
,
1222 #ifdef CONFIG_BPF_SYSCALL
1224 .procname
= "unprivileged_bpf_disabled",
1225 .data
= &sysctl_unprivileged_bpf_disabled
,
1226 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1228 /* only handle a transition from default "0" to "1" */
1229 .proc_handler
= proc_dointvec_minmax
,
1234 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1236 .procname
= "panic_on_rcu_stall",
1237 .data
= &sysctl_panic_on_rcu_stall
,
1238 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1240 .proc_handler
= proc_dointvec_minmax
,
1248 static struct ctl_table vm_table
[] = {
1250 .procname
= "overcommit_memory",
1251 .data
= &sysctl_overcommit_memory
,
1252 .maxlen
= sizeof(sysctl_overcommit_memory
),
1254 .proc_handler
= proc_dointvec_minmax
,
1259 .procname
= "panic_on_oom",
1260 .data
= &sysctl_panic_on_oom
,
1261 .maxlen
= sizeof(sysctl_panic_on_oom
),
1263 .proc_handler
= proc_dointvec_minmax
,
1268 .procname
= "oom_kill_allocating_task",
1269 .data
= &sysctl_oom_kill_allocating_task
,
1270 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1272 .proc_handler
= proc_dointvec
,
1275 .procname
= "oom_dump_tasks",
1276 .data
= &sysctl_oom_dump_tasks
,
1277 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1279 .proc_handler
= proc_dointvec
,
1282 .procname
= "overcommit_ratio",
1283 .data
= &sysctl_overcommit_ratio
,
1284 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1286 .proc_handler
= overcommit_ratio_handler
,
1289 .procname
= "overcommit_kbytes",
1290 .data
= &sysctl_overcommit_kbytes
,
1291 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1293 .proc_handler
= overcommit_kbytes_handler
,
1296 .procname
= "page-cluster",
1297 .data
= &page_cluster
,
1298 .maxlen
= sizeof(int),
1300 .proc_handler
= proc_dointvec_minmax
,
1304 .procname
= "dirty_background_ratio",
1305 .data
= &dirty_background_ratio
,
1306 .maxlen
= sizeof(dirty_background_ratio
),
1308 .proc_handler
= dirty_background_ratio_handler
,
1310 .extra2
= &one_hundred
,
1313 .procname
= "dirty_background_bytes",
1314 .data
= &dirty_background_bytes
,
1315 .maxlen
= sizeof(dirty_background_bytes
),
1317 .proc_handler
= dirty_background_bytes_handler
,
1321 .procname
= "dirty_ratio",
1322 .data
= &vm_dirty_ratio
,
1323 .maxlen
= sizeof(vm_dirty_ratio
),
1325 .proc_handler
= dirty_ratio_handler
,
1327 .extra2
= &one_hundred
,
1330 .procname
= "dirty_bytes",
1331 .data
= &vm_dirty_bytes
,
1332 .maxlen
= sizeof(vm_dirty_bytes
),
1334 .proc_handler
= dirty_bytes_handler
,
1335 .extra1
= &dirty_bytes_min
,
1338 .procname
= "dirty_writeback_centisecs",
1339 .data
= &dirty_writeback_interval
,
1340 .maxlen
= sizeof(dirty_writeback_interval
),
1342 .proc_handler
= dirty_writeback_centisecs_handler
,
1345 .procname
= "dirty_expire_centisecs",
1346 .data
= &dirty_expire_interval
,
1347 .maxlen
= sizeof(dirty_expire_interval
),
1349 .proc_handler
= proc_dointvec_minmax
,
1353 .procname
= "dirtytime_expire_seconds",
1354 .data
= &dirtytime_expire_interval
,
1355 .maxlen
= sizeof(dirty_expire_interval
),
1357 .proc_handler
= dirtytime_interval_handler
,
1361 .procname
= "nr_pdflush_threads",
1362 .mode
= 0444 /* read-only */,
1363 .proc_handler
= pdflush_proc_obsolete
,
1366 .procname
= "swappiness",
1367 .data
= &vm_swappiness
,
1368 .maxlen
= sizeof(vm_swappiness
),
1370 .proc_handler
= proc_dointvec_minmax
,
1372 .extra2
= &one_hundred
,
1374 #ifdef CONFIG_HUGETLB_PAGE
1376 .procname
= "nr_hugepages",
1378 .maxlen
= sizeof(unsigned long),
1380 .proc_handler
= hugetlb_sysctl_handler
,
1384 .procname
= "nr_hugepages_mempolicy",
1386 .maxlen
= sizeof(unsigned long),
1388 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1392 .procname
= "hugetlb_shm_group",
1393 .data
= &sysctl_hugetlb_shm_group
,
1394 .maxlen
= sizeof(gid_t
),
1396 .proc_handler
= proc_dointvec
,
1399 .procname
= "hugepages_treat_as_movable",
1400 .data
= &hugepages_treat_as_movable
,
1401 .maxlen
= sizeof(int),
1403 .proc_handler
= proc_dointvec
,
1406 .procname
= "nr_overcommit_hugepages",
1408 .maxlen
= sizeof(unsigned long),
1410 .proc_handler
= hugetlb_overcommit_handler
,
1414 .procname
= "lowmem_reserve_ratio",
1415 .data
= &sysctl_lowmem_reserve_ratio
,
1416 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1418 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1421 .procname
= "drop_caches",
1422 .data
= &sysctl_drop_caches
,
1423 .maxlen
= sizeof(int),
1425 .proc_handler
= drop_caches_sysctl_handler
,
1429 #ifdef CONFIG_COMPACTION
1431 .procname
= "compact_memory",
1432 .data
= &sysctl_compact_memory
,
1433 .maxlen
= sizeof(int),
1435 .proc_handler
= sysctl_compaction_handler
,
1438 .procname
= "extfrag_threshold",
1439 .data
= &sysctl_extfrag_threshold
,
1440 .maxlen
= sizeof(int),
1442 .proc_handler
= sysctl_extfrag_handler
,
1443 .extra1
= &min_extfrag_threshold
,
1444 .extra2
= &max_extfrag_threshold
,
1447 .procname
= "compact_unevictable_allowed",
1448 .data
= &sysctl_compact_unevictable_allowed
,
1449 .maxlen
= sizeof(int),
1451 .proc_handler
= proc_dointvec
,
1456 #endif /* CONFIG_COMPACTION */
1458 .procname
= "min_free_kbytes",
1459 .data
= &min_free_kbytes
,
1460 .maxlen
= sizeof(min_free_kbytes
),
1462 .proc_handler
= min_free_kbytes_sysctl_handler
,
1466 .procname
= "watermark_scale_factor",
1467 .data
= &watermark_scale_factor
,
1468 .maxlen
= sizeof(watermark_scale_factor
),
1470 .proc_handler
= watermark_scale_factor_sysctl_handler
,
1472 .extra2
= &one_thousand
,
1475 .procname
= "percpu_pagelist_fraction",
1476 .data
= &percpu_pagelist_fraction
,
1477 .maxlen
= sizeof(percpu_pagelist_fraction
),
1479 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1484 .procname
= "max_map_count",
1485 .data
= &sysctl_max_map_count
,
1486 .maxlen
= sizeof(sysctl_max_map_count
),
1488 .proc_handler
= proc_dointvec_minmax
,
1493 .procname
= "nr_trim_pages",
1494 .data
= &sysctl_nr_trim_pages
,
1495 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1497 .proc_handler
= proc_dointvec_minmax
,
1502 .procname
= "laptop_mode",
1503 .data
= &laptop_mode
,
1504 .maxlen
= sizeof(laptop_mode
),
1506 .proc_handler
= proc_dointvec_jiffies
,
1509 .procname
= "block_dump",
1510 .data
= &block_dump
,
1511 .maxlen
= sizeof(block_dump
),
1513 .proc_handler
= proc_dointvec
,
1517 .procname
= "vfs_cache_pressure",
1518 .data
= &sysctl_vfs_cache_pressure
,
1519 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1521 .proc_handler
= proc_dointvec
,
1524 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1526 .procname
= "legacy_va_layout",
1527 .data
= &sysctl_legacy_va_layout
,
1528 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1530 .proc_handler
= proc_dointvec
,
1536 .procname
= "zone_reclaim_mode",
1537 .data
= &node_reclaim_mode
,
1538 .maxlen
= sizeof(node_reclaim_mode
),
1540 .proc_handler
= proc_dointvec
,
1544 .procname
= "min_unmapped_ratio",
1545 .data
= &sysctl_min_unmapped_ratio
,
1546 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1548 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1550 .extra2
= &one_hundred
,
1553 .procname
= "min_slab_ratio",
1554 .data
= &sysctl_min_slab_ratio
,
1555 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1557 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1559 .extra2
= &one_hundred
,
1564 .procname
= "stat_interval",
1565 .data
= &sysctl_stat_interval
,
1566 .maxlen
= sizeof(sysctl_stat_interval
),
1568 .proc_handler
= proc_dointvec_jiffies
,
1571 .procname
= "stat_refresh",
1575 .proc_handler
= vmstat_refresh
,
1580 .procname
= "mmap_min_addr",
1581 .data
= &dac_mmap_min_addr
,
1582 .maxlen
= sizeof(unsigned long),
1584 .proc_handler
= mmap_min_addr_handler
,
1589 .procname
= "numa_zonelist_order",
1590 .data
= &numa_zonelist_order
,
1591 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1593 .proc_handler
= numa_zonelist_order_handler
,
1596 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1597 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1599 .procname
= "vdso_enabled",
1600 #ifdef CONFIG_X86_32
1601 .data
= &vdso32_enabled
,
1602 .maxlen
= sizeof(vdso32_enabled
),
1604 .data
= &vdso_enabled
,
1605 .maxlen
= sizeof(vdso_enabled
),
1608 .proc_handler
= proc_dointvec
,
1612 #ifdef CONFIG_HIGHMEM
1614 .procname
= "highmem_is_dirtyable",
1615 .data
= &vm_highmem_is_dirtyable
,
1616 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1618 .proc_handler
= proc_dointvec_minmax
,
1623 #ifdef CONFIG_MEMORY_FAILURE
1625 .procname
= "memory_failure_early_kill",
1626 .data
= &sysctl_memory_failure_early_kill
,
1627 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1629 .proc_handler
= proc_dointvec_minmax
,
1634 .procname
= "memory_failure_recovery",
1635 .data
= &sysctl_memory_failure_recovery
,
1636 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1638 .proc_handler
= proc_dointvec_minmax
,
1644 .procname
= "user_reserve_kbytes",
1645 .data
= &sysctl_user_reserve_kbytes
,
1646 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1648 .proc_handler
= proc_doulongvec_minmax
,
1651 .procname
= "admin_reserve_kbytes",
1652 .data
= &sysctl_admin_reserve_kbytes
,
1653 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1655 .proc_handler
= proc_doulongvec_minmax
,
1657 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1659 .procname
= "mmap_rnd_bits",
1660 .data
= &mmap_rnd_bits
,
1661 .maxlen
= sizeof(mmap_rnd_bits
),
1663 .proc_handler
= proc_dointvec_minmax
,
1664 .extra1
= (void *)&mmap_rnd_bits_min
,
1665 .extra2
= (void *)&mmap_rnd_bits_max
,
1668 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1670 .procname
= "mmap_rnd_compat_bits",
1671 .data
= &mmap_rnd_compat_bits
,
1672 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1674 .proc_handler
= proc_dointvec_minmax
,
1675 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1676 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1682 static struct ctl_table fs_table
[] = {
1684 .procname
= "inode-nr",
1685 .data
= &inodes_stat
,
1686 .maxlen
= 2*sizeof(long),
1688 .proc_handler
= proc_nr_inodes
,
1691 .procname
= "inode-state",
1692 .data
= &inodes_stat
,
1693 .maxlen
= 7*sizeof(long),
1695 .proc_handler
= proc_nr_inodes
,
1698 .procname
= "file-nr",
1699 .data
= &files_stat
,
1700 .maxlen
= sizeof(files_stat
),
1702 .proc_handler
= proc_nr_files
,
1705 .procname
= "file-max",
1706 .data
= &files_stat
.max_files
,
1707 .maxlen
= sizeof(files_stat
.max_files
),
1709 .proc_handler
= proc_doulongvec_minmax
,
1712 .procname
= "nr_open",
1713 .data
= &sysctl_nr_open
,
1714 .maxlen
= sizeof(unsigned int),
1716 .proc_handler
= proc_dointvec_minmax
,
1717 .extra1
= &sysctl_nr_open_min
,
1718 .extra2
= &sysctl_nr_open_max
,
1721 .procname
= "dentry-state",
1722 .data
= &dentry_stat
,
1723 .maxlen
= 6*sizeof(long),
1725 .proc_handler
= proc_nr_dentry
,
1728 .procname
= "overflowuid",
1729 .data
= &fs_overflowuid
,
1730 .maxlen
= sizeof(int),
1732 .proc_handler
= proc_dointvec_minmax
,
1733 .extra1
= &minolduid
,
1734 .extra2
= &maxolduid
,
1737 .procname
= "overflowgid",
1738 .data
= &fs_overflowgid
,
1739 .maxlen
= sizeof(int),
1741 .proc_handler
= proc_dointvec_minmax
,
1742 .extra1
= &minolduid
,
1743 .extra2
= &maxolduid
,
1745 #ifdef CONFIG_FILE_LOCKING
1747 .procname
= "leases-enable",
1748 .data
= &leases_enable
,
1749 .maxlen
= sizeof(int),
1751 .proc_handler
= proc_dointvec
,
1754 #ifdef CONFIG_DNOTIFY
1756 .procname
= "dir-notify-enable",
1757 .data
= &dir_notify_enable
,
1758 .maxlen
= sizeof(int),
1760 .proc_handler
= proc_dointvec
,
1764 #ifdef CONFIG_FILE_LOCKING
1766 .procname
= "lease-break-time",
1767 .data
= &lease_break_time
,
1768 .maxlen
= sizeof(int),
1770 .proc_handler
= proc_dointvec
,
1775 .procname
= "aio-nr",
1777 .maxlen
= sizeof(aio_nr
),
1779 .proc_handler
= proc_doulongvec_minmax
,
1782 .procname
= "aio-max-nr",
1783 .data
= &aio_max_nr
,
1784 .maxlen
= sizeof(aio_max_nr
),
1786 .proc_handler
= proc_doulongvec_minmax
,
1788 #endif /* CONFIG_AIO */
1789 #ifdef CONFIG_INOTIFY_USER
1791 .procname
= "inotify",
1793 .child
= inotify_table
,
1798 .procname
= "epoll",
1800 .child
= epoll_table
,
1805 .procname
= "protected_symlinks",
1806 .data
= &sysctl_protected_symlinks
,
1807 .maxlen
= sizeof(int),
1809 .proc_handler
= proc_dointvec_minmax
,
1814 .procname
= "protected_hardlinks",
1815 .data
= &sysctl_protected_hardlinks
,
1816 .maxlen
= sizeof(int),
1818 .proc_handler
= proc_dointvec_minmax
,
1823 .procname
= "suid_dumpable",
1824 .data
= &suid_dumpable
,
1825 .maxlen
= sizeof(int),
1827 .proc_handler
= proc_dointvec_minmax_coredump
,
1831 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1833 .procname
= "binfmt_misc",
1835 .child
= sysctl_mount_point
,
1839 .procname
= "pipe-max-size",
1840 .data
= &pipe_max_size
,
1841 .maxlen
= sizeof(int),
1843 .proc_handler
= &pipe_proc_fn
,
1844 .extra1
= &pipe_min_size
,
1847 .procname
= "pipe-user-pages-hard",
1848 .data
= &pipe_user_pages_hard
,
1849 .maxlen
= sizeof(pipe_user_pages_hard
),
1851 .proc_handler
= proc_doulongvec_minmax
,
1854 .procname
= "pipe-user-pages-soft",
1855 .data
= &pipe_user_pages_soft
,
1856 .maxlen
= sizeof(pipe_user_pages_soft
),
1858 .proc_handler
= proc_doulongvec_minmax
,
1861 .procname
= "mount-max",
1862 .data
= &sysctl_mount_max
,
1863 .maxlen
= sizeof(unsigned int),
1865 .proc_handler
= proc_dointvec_minmax
,
1871 static struct ctl_table debug_table
[] = {
1872 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1874 .procname
= "exception-trace",
1875 .data
= &show_unhandled_signals
,
1876 .maxlen
= sizeof(int),
1878 .proc_handler
= proc_dointvec
1881 #if defined(CONFIG_OPTPROBES)
1883 .procname
= "kprobes-optimization",
1884 .data
= &sysctl_kprobes_optimization
,
1885 .maxlen
= sizeof(int),
1887 .proc_handler
= proc_kprobes_optimization_handler
,
1895 static struct ctl_table dev_table
[] = {
1899 int __init
sysctl_init(void)
1901 struct ctl_table_header
*hdr
;
1903 hdr
= register_sysctl_table(sysctl_base_table
);
1904 kmemleak_not_leak(hdr
);
1908 #endif /* CONFIG_SYSCTL */
1914 #ifdef CONFIG_PROC_SYSCTL
1916 static int _proc_do_string(char *data
, int maxlen
, int write
,
1917 char __user
*buffer
,
1918 size_t *lenp
, loff_t
*ppos
)
1924 if (!data
|| !maxlen
|| !*lenp
) {
1930 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1931 /* Only continue writes not past the end of buffer. */
1933 if (len
> maxlen
- 1)
1940 /* Start writing from beginning of buffer. */
1946 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1947 if (get_user(c
, p
++))
1949 if (c
== 0 || c
== '\n')
1970 if (copy_to_user(buffer
, data
, len
))
1973 if (put_user('\n', buffer
+ len
))
1983 static void warn_sysctl_write(struct ctl_table
*table
)
1985 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1986 "This will not be supported in the future. To silence this\n"
1987 "warning, set kernel.sysctl_writes_strict = -1\n",
1988 current
->comm
, table
->procname
);
1992 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1993 * @ppos: file position
1994 * @table: the sysctl table
1996 * Returns true if the first position is non-zero and the sysctl_writes_strict
1997 * mode indicates this is not allowed for numeric input types. String proc
1998 * hadlers can ignore the return value.
2000 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
2001 struct ctl_table
*table
)
2006 switch (sysctl_writes_strict
) {
2007 case SYSCTL_WRITES_STRICT
:
2009 case SYSCTL_WRITES_WARN
:
2010 warn_sysctl_write(table
);
2018 * proc_dostring - read a string sysctl
2019 * @table: the sysctl table
2020 * @write: %TRUE if this is a write to the sysctl file
2021 * @buffer: the user buffer
2022 * @lenp: the size of the user buffer
2023 * @ppos: file position
2025 * Reads/writes a string from/to the user buffer. If the kernel
2026 * buffer provided is not large enough to hold the string, the
2027 * string is truncated. The copied string is %NULL-terminated.
2028 * If the string is being read by the user process, it is copied
2029 * and a newline '\n' is added. It is truncated if the buffer is
2032 * Returns 0 on success.
2034 int proc_dostring(struct ctl_table
*table
, int write
,
2035 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2038 proc_first_pos_non_zero_ignore(ppos
, table
);
2040 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2041 (char __user
*)buffer
, lenp
, ppos
);
2044 static size_t proc_skip_spaces(char **buf
)
2047 char *tmp
= skip_spaces(*buf
);
2053 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2063 #define TMPBUFLEN 22
2065 * proc_get_long - reads an ASCII formatted integer from a user buffer
2067 * @buf: a kernel buffer
2068 * @size: size of the kernel buffer
2069 * @val: this is where the number will be stored
2070 * @neg: set to %TRUE if number is negative
2071 * @perm_tr: a vector which contains the allowed trailers
2072 * @perm_tr_len: size of the perm_tr vector
2073 * @tr: pointer to store the trailer character
2075 * In case of success %0 is returned and @buf and @size are updated with
2076 * the amount of bytes read. If @tr is non-NULL and a trailing
2077 * character exists (size is non-zero after returning from this
2078 * function), @tr is updated with the trailing character.
2080 static int proc_get_long(char **buf
, size_t *size
,
2081 unsigned long *val
, bool *neg
,
2082 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2085 char *p
, tmp
[TMPBUFLEN
];
2091 if (len
> TMPBUFLEN
- 1)
2092 len
= TMPBUFLEN
- 1;
2094 memcpy(tmp
, *buf
, len
);
2098 if (*p
== '-' && *size
> 1) {
2106 *val
= simple_strtoul(p
, &p
, 0);
2110 /* We don't know if the next char is whitespace thus we may accept
2111 * invalid integers (e.g. 1234...a) or two integers instead of one
2112 * (e.g. 123...1). So lets not allow such large numbers. */
2113 if (len
== TMPBUFLEN
- 1)
2116 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2119 if (tr
&& (len
< *size
))
2129 * proc_put_long - converts an integer to a decimal ASCII formatted string
2131 * @buf: the user buffer
2132 * @size: the size of the user buffer
2133 * @val: the integer to be converted
2134 * @neg: sign of the number, %TRUE for negative
2136 * In case of success %0 is returned and @buf and @size are updated with
2137 * the amount of bytes written.
2139 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2143 char tmp
[TMPBUFLEN
], *p
= tmp
;
2145 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2149 if (copy_to_user(*buf
, tmp
, len
))
2157 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2160 char __user
**buffer
= (char __user
**)buf
;
2161 if (put_user(c
, *buffer
))
2163 (*size
)--, (*buffer
)++;
2169 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2171 int write
, void *data
)
2175 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2179 if (*lvalp
> (unsigned long) INT_MAX
)
2187 *lvalp
= -(unsigned long)val
;
2190 *lvalp
= (unsigned long)val
;
2196 static int do_proc_douintvec_conv(unsigned long *lvalp
,
2198 int write
, void *data
)
2201 if (*lvalp
> UINT_MAX
)
2203 if (*lvalp
> UINT_MAX
)
2207 unsigned int val
= *valp
;
2208 *lvalp
= (unsigned long)val
;
2213 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2215 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2216 int write
, void __user
*buffer
,
2217 size_t *lenp
, loff_t
*ppos
,
2218 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2219 int write
, void *data
),
2222 int *i
, vleft
, first
= 1, err
= 0;
2224 char *kbuf
= NULL
, *p
;
2226 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2231 i
= (int *) tbl_data
;
2232 vleft
= table
->maxlen
/ sizeof(*i
);
2236 conv
= do_proc_dointvec_conv
;
2239 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2242 if (left
> PAGE_SIZE
- 1)
2243 left
= PAGE_SIZE
- 1;
2244 p
= kbuf
= memdup_user_nul(buffer
, left
);
2246 return PTR_ERR(kbuf
);
2249 for (; left
&& vleft
--; i
++, first
=0) {
2254 left
-= proc_skip_spaces(&p
);
2258 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2260 sizeof(proc_wspace_sep
), NULL
);
2263 if (conv(&neg
, &lval
, i
, 1, data
)) {
2268 if (conv(&neg
, &lval
, i
, 0, data
)) {
2273 err
= proc_put_char(&buffer
, &left
, '\t');
2276 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2282 if (!write
&& !first
&& left
&& !err
)
2283 err
= proc_put_char(&buffer
, &left
, '\n');
2284 if (write
&& !err
&& left
)
2285 left
-= proc_skip_spaces(&p
);
2289 return err
? : -EINVAL
;
2297 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2298 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2299 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2300 int write
, void *data
),
2303 return __do_proc_dointvec(table
->data
, table
, write
,
2304 buffer
, lenp
, ppos
, conv
, data
);
2307 static int do_proc_douintvec_w(unsigned int *tbl_data
,
2308 struct ctl_table
*table
,
2309 void __user
*buffer
,
2310 size_t *lenp
, loff_t
*ppos
,
2311 int (*conv
)(unsigned long *lvalp
,
2313 int write
, void *data
),
2320 char *kbuf
= NULL
, *p
;
2324 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2327 if (left
> PAGE_SIZE
- 1)
2328 left
= PAGE_SIZE
- 1;
2330 p
= kbuf
= memdup_user_nul(buffer
, left
);
2334 left
-= proc_skip_spaces(&p
);
2340 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2342 sizeof(proc_wspace_sep
), NULL
);
2348 if (conv(&lval
, tbl_data
, 1, data
)) {
2354 left
-= proc_skip_spaces(&p
);
2363 /* This is in keeping with old __do_proc_dointvec() */
2369 static int do_proc_douintvec_r(unsigned int *tbl_data
, void __user
*buffer
,
2370 size_t *lenp
, loff_t
*ppos
,
2371 int (*conv
)(unsigned long *lvalp
,
2373 int write
, void *data
),
2382 if (conv(&lval
, tbl_data
, 0, data
)) {
2387 err
= proc_put_long(&buffer
, &left
, lval
, false);
2391 err
= proc_put_char(&buffer
, &left
, '\n');
2400 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
2401 int write
, void __user
*buffer
,
2402 size_t *lenp
, loff_t
*ppos
,
2403 int (*conv
)(unsigned long *lvalp
,
2405 int write
, void *data
),
2408 unsigned int *i
, vleft
;
2410 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2415 i
= (unsigned int *) tbl_data
;
2416 vleft
= table
->maxlen
/ sizeof(*i
);
2419 * Arrays are not supported, keep this simple. *Do not* add
2428 conv
= do_proc_douintvec_conv
;
2431 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
2433 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
2436 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
2437 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2438 int (*conv
)(unsigned long *lvalp
,
2440 int write
, void *data
),
2443 return __do_proc_douintvec(table
->data
, table
, write
,
2444 buffer
, lenp
, ppos
, conv
, data
);
2448 * proc_dointvec - read a vector of integers
2449 * @table: the sysctl table
2450 * @write: %TRUE if this is a write to the sysctl file
2451 * @buffer: the user buffer
2452 * @lenp: the size of the user buffer
2453 * @ppos: file position
2455 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2456 * values from/to the user buffer, treated as an ASCII string.
2458 * Returns 0 on success.
2460 int proc_dointvec(struct ctl_table
*table
, int write
,
2461 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2463 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2467 * proc_douintvec - read a vector of unsigned integers
2468 * @table: the sysctl table
2469 * @write: %TRUE if this is a write to the sysctl file
2470 * @buffer: the user buffer
2471 * @lenp: the size of the user buffer
2472 * @ppos: file position
2474 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2475 * values from/to the user buffer, treated as an ASCII string.
2477 * Returns 0 on success.
2479 int proc_douintvec(struct ctl_table
*table
, int write
,
2480 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2482 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2483 do_proc_douintvec_conv
, NULL
);
2487 * Taint values can only be increased
2488 * This means we can safely use a temporary.
2490 static int proc_taint(struct ctl_table
*table
, int write
,
2491 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2494 unsigned long tmptaint
= get_taint();
2497 if (write
&& !capable(CAP_SYS_ADMIN
))
2502 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2508 * Poor man's atomic or. Not worth adding a primitive
2509 * to everyone's atomic.h for this
2512 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2513 if ((tmptaint
>> i
) & 1)
2514 add_taint(i
, LOCKDEP_STILL_OK
);
2521 #ifdef CONFIG_PRINTK
2522 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2523 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2525 if (write
&& !capable(CAP_SYS_ADMIN
))
2528 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2532 struct do_proc_dointvec_minmax_conv_param
{
2537 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2539 int write
, void *data
)
2541 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2543 int val
= *negp
? -*lvalp
: *lvalp
;
2544 if ((param
->min
&& *param
->min
> val
) ||
2545 (param
->max
&& *param
->max
< val
))
2552 *lvalp
= -(unsigned long)val
;
2555 *lvalp
= (unsigned long)val
;
2562 * proc_dointvec_minmax - read a vector of integers with min/max values
2563 * @table: the sysctl table
2564 * @write: %TRUE if this is a write to the sysctl file
2565 * @buffer: the user buffer
2566 * @lenp: the size of the user buffer
2567 * @ppos: file position
2569 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2570 * values from/to the user buffer, treated as an ASCII string.
2572 * This routine will ensure the values are within the range specified by
2573 * table->extra1 (min) and table->extra2 (max).
2575 * Returns 0 on success.
2577 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2578 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2580 struct do_proc_dointvec_minmax_conv_param param
= {
2581 .min
= (int *) table
->extra1
,
2582 .max
= (int *) table
->extra2
,
2584 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2585 do_proc_dointvec_minmax_conv
, ¶m
);
2588 struct do_proc_douintvec_minmax_conv_param
{
2593 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
2595 int write
, void *data
)
2597 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
2600 unsigned int val
= *lvalp
;
2602 if ((param
->min
&& *param
->min
> val
) ||
2603 (param
->max
&& *param
->max
< val
))
2606 if (*lvalp
> UINT_MAX
)
2610 unsigned int val
= *valp
;
2611 *lvalp
= (unsigned long) val
;
2618 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2619 * @table: the sysctl table
2620 * @write: %TRUE if this is a write to the sysctl file
2621 * @buffer: the user buffer
2622 * @lenp: the size of the user buffer
2623 * @ppos: file position
2625 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2626 * values from/to the user buffer, treated as an ASCII string. Negative
2627 * strings are not allowed.
2629 * This routine will ensure the values are within the range specified by
2630 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2631 * check for UINT_MAX to avoid having to support wrap around uses from
2634 * Returns 0 on success.
2636 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
2637 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2639 struct do_proc_douintvec_minmax_conv_param param
= {
2640 .min
= (unsigned int *) table
->extra1
,
2641 .max
= (unsigned int *) table
->extra2
,
2643 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2644 do_proc_douintvec_minmax_conv
, ¶m
);
2647 static void validate_coredump_safety(void)
2649 #ifdef CONFIG_COREDUMP
2650 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2651 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2653 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2654 "Pipe handler or fully qualified core dump path required.\n"
2655 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2661 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2662 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2664 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2666 validate_coredump_safety();
2670 #ifdef CONFIG_COREDUMP
2671 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2672 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2674 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2676 validate_coredump_safety();
2681 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2682 void __user
*buffer
,
2683 size_t *lenp
, loff_t
*ppos
,
2684 unsigned long convmul
,
2685 unsigned long convdiv
)
2687 unsigned long *i
, *min
, *max
;
2688 int vleft
, first
= 1, err
= 0;
2690 char *kbuf
= NULL
, *p
;
2692 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2697 i
= (unsigned long *) data
;
2698 min
= (unsigned long *) table
->extra1
;
2699 max
= (unsigned long *) table
->extra2
;
2700 vleft
= table
->maxlen
/ sizeof(unsigned long);
2704 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2707 if (left
> PAGE_SIZE
- 1)
2708 left
= PAGE_SIZE
- 1;
2709 p
= kbuf
= memdup_user_nul(buffer
, left
);
2711 return PTR_ERR(kbuf
);
2714 for (; left
&& vleft
--; i
++, first
= 0) {
2720 left
-= proc_skip_spaces(&p
);
2722 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2724 sizeof(proc_wspace_sep
), NULL
);
2729 val
= convmul
* val
/ convdiv
;
2730 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2734 val
= convdiv
* (*i
) / convmul
;
2736 err
= proc_put_char(&buffer
, &left
, '\t');
2740 err
= proc_put_long(&buffer
, &left
, val
, false);
2746 if (!write
&& !first
&& left
&& !err
)
2747 err
= proc_put_char(&buffer
, &left
, '\n');
2749 left
-= proc_skip_spaces(&p
);
2753 return err
? : -EINVAL
;
2761 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2762 void __user
*buffer
,
2763 size_t *lenp
, loff_t
*ppos
,
2764 unsigned long convmul
,
2765 unsigned long convdiv
)
2767 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2768 buffer
, lenp
, ppos
, convmul
, convdiv
);
2772 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2773 * @table: the sysctl table
2774 * @write: %TRUE if this is a write to the sysctl file
2775 * @buffer: the user buffer
2776 * @lenp: the size of the user buffer
2777 * @ppos: file position
2779 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2780 * values from/to the user buffer, treated as an ASCII string.
2782 * This routine will ensure the values are within the range specified by
2783 * table->extra1 (min) and table->extra2 (max).
2785 * Returns 0 on success.
2787 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2788 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2790 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2794 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2795 * @table: the sysctl table
2796 * @write: %TRUE if this is a write to the sysctl file
2797 * @buffer: the user buffer
2798 * @lenp: the size of the user buffer
2799 * @ppos: file position
2801 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2802 * values from/to the user buffer, treated as an ASCII string. The values
2803 * are treated as milliseconds, and converted to jiffies when they are stored.
2805 * This routine will ensure the values are within the range specified by
2806 * table->extra1 (min) and table->extra2 (max).
2808 * Returns 0 on success.
2810 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2811 void __user
*buffer
,
2812 size_t *lenp
, loff_t
*ppos
)
2814 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2815 lenp
, ppos
, HZ
, 1000l);
2819 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2821 int write
, void *data
)
2824 if (*lvalp
> INT_MAX
/ HZ
)
2826 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2832 lval
= -(unsigned long)val
;
2835 lval
= (unsigned long)val
;
2842 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2844 int write
, void *data
)
2847 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2849 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2855 lval
= -(unsigned long)val
;
2858 lval
= (unsigned long)val
;
2860 *lvalp
= jiffies_to_clock_t(lval
);
2865 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2867 int write
, void *data
)
2870 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2880 lval
= -(unsigned long)val
;
2883 lval
= (unsigned long)val
;
2885 *lvalp
= jiffies_to_msecs(lval
);
2891 * proc_dointvec_jiffies - read a vector of integers as seconds
2892 * @table: the sysctl table
2893 * @write: %TRUE if this is a write to the sysctl file
2894 * @buffer: the user buffer
2895 * @lenp: the size of the user buffer
2896 * @ppos: file position
2898 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2899 * values from/to the user buffer, treated as an ASCII string.
2900 * The values read are assumed to be in seconds, and are converted into
2903 * Returns 0 on success.
2905 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2906 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2908 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2909 do_proc_dointvec_jiffies_conv
,NULL
);
2913 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2914 * @table: the sysctl table
2915 * @write: %TRUE if this is a write to the sysctl file
2916 * @buffer: the user buffer
2917 * @lenp: the size of the user buffer
2918 * @ppos: pointer to the file position
2920 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2921 * values from/to the user buffer, treated as an ASCII string.
2922 * The values read are assumed to be in 1/USER_HZ seconds, and
2923 * are converted into jiffies.
2925 * Returns 0 on success.
2927 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2928 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2930 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2931 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2935 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2936 * @table: the sysctl table
2937 * @write: %TRUE if this is a write to the sysctl file
2938 * @buffer: the user buffer
2939 * @lenp: the size of the user buffer
2940 * @ppos: file position
2941 * @ppos: the current position in the file
2943 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2944 * values from/to the user buffer, treated as an ASCII string.
2945 * The values read are assumed to be in 1/1000 seconds, and
2946 * are converted into jiffies.
2948 * Returns 0 on success.
2950 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2951 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2953 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2954 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2957 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2958 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2960 struct pid
*new_pid
;
2964 tmp
= pid_vnr(cad_pid
);
2966 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2967 lenp
, ppos
, NULL
, NULL
);
2971 new_pid
= find_get_pid(tmp
);
2975 put_pid(xchg(&cad_pid
, new_pid
));
2980 * proc_do_large_bitmap - read/write from/to a large bitmap
2981 * @table: the sysctl table
2982 * @write: %TRUE if this is a write to the sysctl file
2983 * @buffer: the user buffer
2984 * @lenp: the size of the user buffer
2985 * @ppos: file position
2987 * The bitmap is stored at table->data and the bitmap length (in bits)
2990 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2991 * large bitmaps may be represented in a compact manner. Writing into
2992 * the file will clear the bitmap then update it with the given input.
2994 * Returns 0 on success.
2996 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2997 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3001 size_t left
= *lenp
;
3002 unsigned long bitmap_len
= table
->maxlen
;
3003 unsigned long *bitmap
= *(unsigned long **) table
->data
;
3004 unsigned long *tmp_bitmap
= NULL
;
3005 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
3007 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
3015 if (left
> PAGE_SIZE
- 1)
3016 left
= PAGE_SIZE
- 1;
3018 p
= kbuf
= memdup_user_nul(buffer
, left
);
3020 return PTR_ERR(kbuf
);
3022 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
3028 proc_skip_char(&p
, &left
, '\n');
3029 while (!err
&& left
) {
3030 unsigned long val_a
, val_b
;
3033 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
3037 if (val_a
>= bitmap_len
|| neg
) {
3049 err
= proc_get_long(&p
, &left
, &val_b
,
3050 &neg
, tr_b
, sizeof(tr_b
),
3054 if (val_b
>= bitmap_len
|| neg
||
3065 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
3067 proc_skip_char(&p
, &left
, '\n');
3071 unsigned long bit_a
, bit_b
= 0;
3074 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
3075 if (bit_a
>= bitmap_len
)
3077 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
3081 err
= proc_put_char(&buffer
, &left
, ',');
3085 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
3088 if (bit_a
!= bit_b
) {
3089 err
= proc_put_char(&buffer
, &left
, '-');
3092 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
3100 err
= proc_put_char(&buffer
, &left
, '\n');
3106 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
3108 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3120 #else /* CONFIG_PROC_SYSCTL */
3122 int proc_dostring(struct ctl_table
*table
, int write
,
3123 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3128 int proc_dointvec(struct ctl_table
*table
, int write
,
3129 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3134 int proc_douintvec(struct ctl_table
*table
, int write
,
3135 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3140 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3141 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3146 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
3147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3152 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3158 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3159 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3164 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3165 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3170 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3171 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3176 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3177 void __user
*buffer
,
3178 size_t *lenp
, loff_t
*ppos
)
3184 #endif /* CONFIG_PROC_SYSCTL */
3187 * No sense putting this after each symbol definition, twice,
3188 * exception granted :-)
3190 EXPORT_SYMBOL(proc_dointvec
);
3191 EXPORT_SYMBOL(proc_douintvec
);
3192 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3193 EXPORT_SYMBOL(proc_dointvec_minmax
);
3194 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3195 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3196 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3197 EXPORT_SYMBOL(proc_dostring
);
3198 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3199 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);