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
;
109 extern int pid_max_min
, pid_max_max
;
110 extern int percpu_pagelist_fraction
;
111 extern int latencytop_enabled
;
112 extern unsigned int sysctl_nr_open_min
, sysctl_nr_open_max
;
114 extern int sysctl_nr_trim_pages
;
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty
= 60;
122 static int __maybe_unused neg_one
= -1;
125 static int __maybe_unused one
= 1;
126 static int __maybe_unused two
= 2;
127 static int __maybe_unused four
= 4;
128 static unsigned long one_ul
= 1;
129 static int one_hundred
= 100;
130 static int one_thousand
= 1000;
132 static int ten_thousand
= 10000;
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb
= 640 * 1024;
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid
= 65535;
143 static int minolduid
;
145 static int ngroups_max
= NGROUPS_MAX
;
146 static const int cap_last_cap
= CAP_LAST_CAP
;
148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149 #ifdef CONFIG_DETECT_HUNG_TASK
150 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
153 #ifdef CONFIG_INOTIFY_USER
154 #include <linux/inotify.h>
160 extern int pwrsw_enabled
;
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled
;
168 extern int unaligned_dump_stack
;
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning
;
175 #ifdef CONFIG_PROC_SYSCTL
178 * enum sysctl_writes_mode - supported sysctl write modes
180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
181 * to be written, and multiple writes on the same sysctl file descriptor
182 * will rewrite the sysctl value, regardless of file position. No warning
183 * is issued when the initial position is not 0.
184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
187 * file position 0 and the value must be fully contained in the buffer
188 * sent to the write syscall. If dealing with strings respect the file
189 * position, but restrict this to the max length of the buffer, anything
190 * passed the max lenght will be ignored. Multiple writes will append
193 * These write modes control how current file position affects the behavior of
194 * updating sysctl values through the proc interface on each write.
196 enum sysctl_writes_mode
{
197 SYSCTL_WRITES_LEGACY
= -1,
198 SYSCTL_WRITES_WARN
= 0,
199 SYSCTL_WRITES_STRICT
= 1,
202 static enum sysctl_writes_mode sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
204 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
205 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
206 static int proc_taint(struct ctl_table
*table
, int write
,
207 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
211 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
212 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
215 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
216 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
217 #ifdef CONFIG_COREDUMP
218 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
219 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
222 #ifdef CONFIG_MAGIC_SYSRQ
223 /* Note: sysrq code uses it's own private copy */
224 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
226 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
227 void __user
*buffer
, size_t *lenp
,
232 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
237 sysrq_toggle_support(__sysrq_enabled
);
244 static struct ctl_table kern_table
[];
245 static struct ctl_table vm_table
[];
246 static struct ctl_table fs_table
[];
247 static struct ctl_table debug_table
[];
248 static struct ctl_table dev_table
[];
249 extern struct ctl_table random_table
[];
251 extern struct ctl_table epoll_table
[];
254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
255 int sysctl_legacy_va_layout
;
258 /* The default sysctl tables: */
260 static struct ctl_table sysctl_base_table
[] = {
262 .procname
= "kernel",
279 .child
= debug_table
,
289 #ifdef CONFIG_SCHED_DEBUG
290 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
291 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
292 static int min_wakeup_granularity_ns
; /* 0 usecs */
293 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
295 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
296 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
297 #endif /* CONFIG_SMP */
298 #endif /* CONFIG_SCHED_DEBUG */
300 #ifdef CONFIG_COMPACTION
301 static int min_extfrag_threshold
;
302 static int max_extfrag_threshold
= 1000;
305 static struct ctl_table kern_table
[] = {
307 .procname
= "sched_child_runs_first",
308 .data
= &sysctl_sched_child_runs_first
,
309 .maxlen
= sizeof(unsigned int),
311 .proc_handler
= proc_dointvec
,
313 #ifdef CONFIG_SCHED_DEBUG
315 .procname
= "sched_min_granularity_ns",
316 .data
= &sysctl_sched_min_granularity
,
317 .maxlen
= sizeof(unsigned int),
319 .proc_handler
= sched_proc_update_handler
,
320 .extra1
= &min_sched_granularity_ns
,
321 .extra2
= &max_sched_granularity_ns
,
324 .procname
= "sched_latency_ns",
325 .data
= &sysctl_sched_latency
,
326 .maxlen
= sizeof(unsigned int),
328 .proc_handler
= sched_proc_update_handler
,
329 .extra1
= &min_sched_granularity_ns
,
330 .extra2
= &max_sched_granularity_ns
,
333 .procname
= "sched_wakeup_granularity_ns",
334 .data
= &sysctl_sched_wakeup_granularity
,
335 .maxlen
= sizeof(unsigned int),
337 .proc_handler
= sched_proc_update_handler
,
338 .extra1
= &min_wakeup_granularity_ns
,
339 .extra2
= &max_wakeup_granularity_ns
,
343 .procname
= "sched_tunable_scaling",
344 .data
= &sysctl_sched_tunable_scaling
,
345 .maxlen
= sizeof(enum sched_tunable_scaling
),
347 .proc_handler
= sched_proc_update_handler
,
348 .extra1
= &min_sched_tunable_scaling
,
349 .extra2
= &max_sched_tunable_scaling
,
352 .procname
= "sched_migration_cost_ns",
353 .data
= &sysctl_sched_migration_cost
,
354 .maxlen
= sizeof(unsigned int),
356 .proc_handler
= proc_dointvec
,
359 .procname
= "sched_nr_migrate",
360 .data
= &sysctl_sched_nr_migrate
,
361 .maxlen
= sizeof(unsigned int),
363 .proc_handler
= proc_dointvec
,
366 .procname
= "sched_time_avg_ms",
367 .data
= &sysctl_sched_time_avg
,
368 .maxlen
= sizeof(unsigned int),
370 .proc_handler
= proc_dointvec_minmax
,
373 #ifdef CONFIG_SCHEDSTATS
375 .procname
= "sched_schedstats",
377 .maxlen
= sizeof(unsigned int),
379 .proc_handler
= sysctl_schedstats
,
383 #endif /* CONFIG_SCHEDSTATS */
384 #endif /* CONFIG_SMP */
385 #ifdef CONFIG_NUMA_BALANCING
387 .procname
= "numa_balancing_scan_delay_ms",
388 .data
= &sysctl_numa_balancing_scan_delay
,
389 .maxlen
= sizeof(unsigned int),
391 .proc_handler
= proc_dointvec
,
394 .procname
= "numa_balancing_scan_period_min_ms",
395 .data
= &sysctl_numa_balancing_scan_period_min
,
396 .maxlen
= sizeof(unsigned int),
398 .proc_handler
= proc_dointvec
,
401 .procname
= "numa_balancing_scan_period_max_ms",
402 .data
= &sysctl_numa_balancing_scan_period_max
,
403 .maxlen
= sizeof(unsigned int),
405 .proc_handler
= proc_dointvec
,
408 .procname
= "numa_balancing_scan_size_mb",
409 .data
= &sysctl_numa_balancing_scan_size
,
410 .maxlen
= sizeof(unsigned int),
412 .proc_handler
= proc_dointvec_minmax
,
416 .procname
= "numa_balancing",
417 .data
= NULL
, /* filled in by handler */
418 .maxlen
= sizeof(unsigned int),
420 .proc_handler
= sysctl_numa_balancing
,
424 #endif /* CONFIG_NUMA_BALANCING */
425 #endif /* CONFIG_SCHED_DEBUG */
427 .procname
= "sched_rt_period_us",
428 .data
= &sysctl_sched_rt_period
,
429 .maxlen
= sizeof(unsigned int),
431 .proc_handler
= sched_rt_handler
,
434 .procname
= "sched_rt_runtime_us",
435 .data
= &sysctl_sched_rt_runtime
,
436 .maxlen
= sizeof(int),
438 .proc_handler
= sched_rt_handler
,
441 .procname
= "sched_rr_timeslice_ms",
442 .data
= &sysctl_sched_rr_timeslice
,
443 .maxlen
= sizeof(int),
445 .proc_handler
= sched_rr_handler
,
447 #ifdef CONFIG_SCHED_AUTOGROUP
449 .procname
= "sched_autogroup_enabled",
450 .data
= &sysctl_sched_autogroup_enabled
,
451 .maxlen
= sizeof(unsigned int),
453 .proc_handler
= proc_dointvec_minmax
,
458 #ifdef CONFIG_CFS_BANDWIDTH
460 .procname
= "sched_cfs_bandwidth_slice_us",
461 .data
= &sysctl_sched_cfs_bandwidth_slice
,
462 .maxlen
= sizeof(unsigned int),
464 .proc_handler
= proc_dointvec_minmax
,
468 #ifdef CONFIG_PROVE_LOCKING
470 .procname
= "prove_locking",
471 .data
= &prove_locking
,
472 .maxlen
= sizeof(int),
474 .proc_handler
= proc_dointvec
,
477 #ifdef CONFIG_LOCK_STAT
479 .procname
= "lock_stat",
481 .maxlen
= sizeof(int),
483 .proc_handler
= proc_dointvec
,
488 .data
= &panic_timeout
,
489 .maxlen
= sizeof(int),
491 .proc_handler
= proc_dointvec
,
493 #ifdef CONFIG_COREDUMP
495 .procname
= "core_uses_pid",
496 .data
= &core_uses_pid
,
497 .maxlen
= sizeof(int),
499 .proc_handler
= proc_dointvec
,
502 .procname
= "core_pattern",
503 .data
= core_pattern
,
504 .maxlen
= CORENAME_MAX_SIZE
,
506 .proc_handler
= proc_dostring_coredump
,
509 .procname
= "core_pipe_limit",
510 .data
= &core_pipe_limit
,
511 .maxlen
= sizeof(unsigned int),
513 .proc_handler
= proc_dointvec
,
516 #ifdef CONFIG_PROC_SYSCTL
518 .procname
= "tainted",
519 .maxlen
= sizeof(long),
521 .proc_handler
= proc_taint
,
524 .procname
= "sysctl_writes_strict",
525 .data
= &sysctl_writes_strict
,
526 .maxlen
= sizeof(int),
528 .proc_handler
= proc_dointvec_minmax
,
533 #ifdef CONFIG_LATENCYTOP
535 .procname
= "latencytop",
536 .data
= &latencytop_enabled
,
537 .maxlen
= sizeof(int),
539 .proc_handler
= sysctl_latencytop
,
542 #ifdef CONFIG_BLK_DEV_INITRD
544 .procname
= "real-root-dev",
545 .data
= &real_root_dev
,
546 .maxlen
= sizeof(int),
548 .proc_handler
= proc_dointvec
,
552 .procname
= "print-fatal-signals",
553 .data
= &print_fatal_signals
,
554 .maxlen
= sizeof(int),
556 .proc_handler
= proc_dointvec
,
560 .procname
= "reboot-cmd",
561 .data
= reboot_command
,
564 .proc_handler
= proc_dostring
,
567 .procname
= "stop-a",
568 .data
= &stop_a_enabled
,
569 .maxlen
= sizeof (int),
571 .proc_handler
= proc_dointvec
,
574 .procname
= "scons-poweroff",
575 .data
= &scons_pwroff
,
576 .maxlen
= sizeof (int),
578 .proc_handler
= proc_dointvec
,
581 #ifdef CONFIG_SPARC64
583 .procname
= "tsb-ratio",
584 .data
= &sysctl_tsb_ratio
,
585 .maxlen
= sizeof (int),
587 .proc_handler
= proc_dointvec
,
592 .procname
= "soft-power",
593 .data
= &pwrsw_enabled
,
594 .maxlen
= sizeof (int),
596 .proc_handler
= proc_dointvec
,
599 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
601 .procname
= "unaligned-trap",
602 .data
= &unaligned_enabled
,
603 .maxlen
= sizeof (int),
605 .proc_handler
= proc_dointvec
,
609 .procname
= "ctrl-alt-del",
611 .maxlen
= sizeof(int),
613 .proc_handler
= proc_dointvec
,
615 #ifdef CONFIG_FUNCTION_TRACER
617 .procname
= "ftrace_enabled",
618 .data
= &ftrace_enabled
,
619 .maxlen
= sizeof(int),
621 .proc_handler
= ftrace_enable_sysctl
,
624 #ifdef CONFIG_STACK_TRACER
626 .procname
= "stack_tracer_enabled",
627 .data
= &stack_tracer_enabled
,
628 .maxlen
= sizeof(int),
630 .proc_handler
= stack_trace_sysctl
,
633 #ifdef CONFIG_TRACING
635 .procname
= "ftrace_dump_on_oops",
636 .data
= &ftrace_dump_on_oops
,
637 .maxlen
= sizeof(int),
639 .proc_handler
= proc_dointvec
,
642 .procname
= "traceoff_on_warning",
643 .data
= &__disable_trace_on_warning
,
644 .maxlen
= sizeof(__disable_trace_on_warning
),
646 .proc_handler
= proc_dointvec
,
649 .procname
= "tracepoint_printk",
650 .data
= &tracepoint_printk
,
651 .maxlen
= sizeof(tracepoint_printk
),
653 .proc_handler
= tracepoint_printk_sysctl
,
656 #ifdef CONFIG_KEXEC_CORE
658 .procname
= "kexec_load_disabled",
659 .data
= &kexec_load_disabled
,
660 .maxlen
= sizeof(int),
662 /* only handle a transition from default "0" to "1" */
663 .proc_handler
= proc_dointvec_minmax
,
668 #ifdef CONFIG_MODULES
670 .procname
= "modprobe",
671 .data
= &modprobe_path
,
672 .maxlen
= KMOD_PATH_LEN
,
674 .proc_handler
= proc_dostring
,
677 .procname
= "modules_disabled",
678 .data
= &modules_disabled
,
679 .maxlen
= sizeof(int),
681 /* only handle a transition from default "0" to "1" */
682 .proc_handler
= proc_dointvec_minmax
,
687 #ifdef CONFIG_UEVENT_HELPER
689 .procname
= "hotplug",
690 .data
= &uevent_helper
,
691 .maxlen
= UEVENT_HELPER_PATH_LEN
,
693 .proc_handler
= proc_dostring
,
696 #ifdef CONFIG_CHR_DEV_SG
698 .procname
= "sg-big-buff",
699 .data
= &sg_big_buff
,
700 .maxlen
= sizeof (int),
702 .proc_handler
= proc_dointvec
,
705 #ifdef CONFIG_BSD_PROCESS_ACCT
709 .maxlen
= 3*sizeof(int),
711 .proc_handler
= proc_dointvec
,
714 #ifdef CONFIG_MAGIC_SYSRQ
717 .data
= &__sysrq_enabled
,
718 .maxlen
= sizeof (int),
720 .proc_handler
= sysrq_sysctl_handler
,
723 #ifdef CONFIG_PROC_SYSCTL
725 .procname
= "cad_pid",
727 .maxlen
= sizeof (int),
729 .proc_handler
= proc_do_cad_pid
,
733 .procname
= "threads-max",
735 .maxlen
= sizeof(int),
737 .proc_handler
= sysctl_max_threads
,
740 .procname
= "random",
742 .child
= random_table
,
745 .procname
= "usermodehelper",
747 .child
= usermodehelper_table
,
750 .procname
= "overflowuid",
751 .data
= &overflowuid
,
752 .maxlen
= sizeof(int),
754 .proc_handler
= proc_dointvec_minmax
,
755 .extra1
= &minolduid
,
756 .extra2
= &maxolduid
,
759 .procname
= "overflowgid",
760 .data
= &overflowgid
,
761 .maxlen
= sizeof(int),
763 .proc_handler
= proc_dointvec_minmax
,
764 .extra1
= &minolduid
,
765 .extra2
= &maxolduid
,
768 #ifdef CONFIG_MATHEMU
770 .procname
= "ieee_emulation_warnings",
771 .data
= &sysctl_ieee_emulation_warnings
,
772 .maxlen
= sizeof(int),
774 .proc_handler
= proc_dointvec
,
778 .procname
= "userprocess_debug",
779 .data
= &show_unhandled_signals
,
780 .maxlen
= sizeof(int),
782 .proc_handler
= proc_dointvec
,
786 .procname
= "pid_max",
788 .maxlen
= sizeof (int),
790 .proc_handler
= proc_dointvec_minmax
,
791 .extra1
= &pid_max_min
,
792 .extra2
= &pid_max_max
,
795 .procname
= "panic_on_oops",
796 .data
= &panic_on_oops
,
797 .maxlen
= sizeof(int),
799 .proc_handler
= proc_dointvec
,
801 #if defined CONFIG_PRINTK
803 .procname
= "printk",
804 .data
= &console_loglevel
,
805 .maxlen
= 4*sizeof(int),
807 .proc_handler
= proc_dointvec
,
810 .procname
= "printk_ratelimit",
811 .data
= &printk_ratelimit_state
.interval
,
812 .maxlen
= sizeof(int),
814 .proc_handler
= proc_dointvec_jiffies
,
817 .procname
= "printk_ratelimit_burst",
818 .data
= &printk_ratelimit_state
.burst
,
819 .maxlen
= sizeof(int),
821 .proc_handler
= proc_dointvec
,
824 .procname
= "printk_delay",
825 .data
= &printk_delay_msec
,
826 .maxlen
= sizeof(int),
828 .proc_handler
= proc_dointvec_minmax
,
830 .extra2
= &ten_thousand
,
833 .procname
= "printk_devkmsg",
834 .data
= devkmsg_log_str
,
835 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
837 .proc_handler
= devkmsg_sysctl_set_loglvl
,
840 .procname
= "dmesg_restrict",
841 .data
= &dmesg_restrict
,
842 .maxlen
= sizeof(int),
844 .proc_handler
= proc_dointvec_minmax_sysadmin
,
849 .procname
= "kptr_restrict",
850 .data
= &kptr_restrict
,
851 .maxlen
= sizeof(int),
853 .proc_handler
= proc_dointvec_minmax_sysadmin
,
859 .procname
= "ngroups_max",
860 .data
= &ngroups_max
,
861 .maxlen
= sizeof (int),
863 .proc_handler
= proc_dointvec
,
866 .procname
= "cap_last_cap",
867 .data
= (void *)&cap_last_cap
,
868 .maxlen
= sizeof(int),
870 .proc_handler
= proc_dointvec
,
872 #if defined(CONFIG_LOCKUP_DETECTOR)
874 .procname
= "watchdog",
875 .data
= &watchdog_user_enabled
,
876 .maxlen
= sizeof(int),
878 .proc_handler
= proc_watchdog
,
883 .procname
= "watchdog_thresh",
884 .data
= &watchdog_thresh
,
885 .maxlen
= sizeof(int),
887 .proc_handler
= proc_watchdog_thresh
,
892 .procname
= "nmi_watchdog",
893 .data
= &nmi_watchdog_user_enabled
,
894 .maxlen
= sizeof(int),
895 .mode
= NMI_WATCHDOG_SYSCTL_PERM
,
896 .proc_handler
= proc_nmi_watchdog
,
901 .procname
= "watchdog_cpumask",
902 .data
= &watchdog_cpumask_bits
,
905 .proc_handler
= proc_watchdog_cpumask
,
907 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
909 .procname
= "soft_watchdog",
910 .data
= &soft_watchdog_user_enabled
,
911 .maxlen
= sizeof(int),
913 .proc_handler
= proc_soft_watchdog
,
918 .procname
= "softlockup_panic",
919 .data
= &softlockup_panic
,
920 .maxlen
= sizeof(int),
922 .proc_handler
= proc_dointvec_minmax
,
928 .procname
= "softlockup_all_cpu_backtrace",
929 .data
= &sysctl_softlockup_all_cpu_backtrace
,
930 .maxlen
= sizeof(int),
932 .proc_handler
= proc_dointvec_minmax
,
936 #endif /* CONFIG_SMP */
938 #ifdef CONFIG_HARDLOCKUP_DETECTOR
940 .procname
= "hardlockup_panic",
941 .data
= &hardlockup_panic
,
942 .maxlen
= sizeof(int),
944 .proc_handler
= proc_dointvec_minmax
,
950 .procname
= "hardlockup_all_cpu_backtrace",
951 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
952 .maxlen
= sizeof(int),
954 .proc_handler
= proc_dointvec_minmax
,
958 #endif /* CONFIG_SMP */
962 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
964 .procname
= "unknown_nmi_panic",
965 .data
= &unknown_nmi_panic
,
966 .maxlen
= sizeof (int),
968 .proc_handler
= proc_dointvec
,
971 #if defined(CONFIG_X86)
973 .procname
= "panic_on_unrecovered_nmi",
974 .data
= &panic_on_unrecovered_nmi
,
975 .maxlen
= sizeof(int),
977 .proc_handler
= proc_dointvec
,
980 .procname
= "panic_on_io_nmi",
981 .data
= &panic_on_io_nmi
,
982 .maxlen
= sizeof(int),
984 .proc_handler
= proc_dointvec
,
986 #ifdef CONFIG_DEBUG_STACKOVERFLOW
988 .procname
= "panic_on_stackoverflow",
989 .data
= &sysctl_panic_on_stackoverflow
,
990 .maxlen
= sizeof(int),
992 .proc_handler
= proc_dointvec
,
996 .procname
= "bootloader_type",
997 .data
= &bootloader_type
,
998 .maxlen
= sizeof (int),
1000 .proc_handler
= proc_dointvec
,
1003 .procname
= "bootloader_version",
1004 .data
= &bootloader_version
,
1005 .maxlen
= sizeof (int),
1007 .proc_handler
= proc_dointvec
,
1010 .procname
= "io_delay_type",
1011 .data
= &io_delay_type
,
1012 .maxlen
= sizeof(int),
1014 .proc_handler
= proc_dointvec
,
1017 #if defined(CONFIG_MMU)
1019 .procname
= "randomize_va_space",
1020 .data
= &randomize_va_space
,
1021 .maxlen
= sizeof(int),
1023 .proc_handler
= proc_dointvec
,
1026 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1028 .procname
= "spin_retry",
1029 .data
= &spin_retry
,
1030 .maxlen
= sizeof (int),
1032 .proc_handler
= proc_dointvec
,
1035 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1037 .procname
= "acpi_video_flags",
1038 .data
= &acpi_realmode_flags
,
1039 .maxlen
= sizeof (unsigned long),
1041 .proc_handler
= proc_doulongvec_minmax
,
1044 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1046 .procname
= "ignore-unaligned-usertrap",
1047 .data
= &no_unaligned_warning
,
1048 .maxlen
= sizeof (int),
1050 .proc_handler
= proc_dointvec
,
1055 .procname
= "unaligned-dump-stack",
1056 .data
= &unaligned_dump_stack
,
1057 .maxlen
= sizeof (int),
1059 .proc_handler
= proc_dointvec
,
1062 #ifdef CONFIG_DETECT_HUNG_TASK
1064 .procname
= "hung_task_panic",
1065 .data
= &sysctl_hung_task_panic
,
1066 .maxlen
= sizeof(int),
1068 .proc_handler
= proc_dointvec_minmax
,
1073 .procname
= "hung_task_check_count",
1074 .data
= &sysctl_hung_task_check_count
,
1075 .maxlen
= sizeof(int),
1077 .proc_handler
= proc_dointvec_minmax
,
1081 .procname
= "hung_task_timeout_secs",
1082 .data
= &sysctl_hung_task_timeout_secs
,
1083 .maxlen
= sizeof(unsigned long),
1085 .proc_handler
= proc_dohung_task_timeout_secs
,
1086 .extra2
= &hung_task_timeout_max
,
1089 .procname
= "hung_task_warnings",
1090 .data
= &sysctl_hung_task_warnings
,
1091 .maxlen
= sizeof(int),
1093 .proc_handler
= proc_dointvec_minmax
,
1097 #ifdef CONFIG_RT_MUTEXES
1099 .procname
= "max_lock_depth",
1100 .data
= &max_lock_depth
,
1101 .maxlen
= sizeof(int),
1103 .proc_handler
= proc_dointvec
,
1107 .procname
= "poweroff_cmd",
1108 .data
= &poweroff_cmd
,
1109 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1111 .proc_handler
= proc_dostring
,
1117 .child
= key_sysctls
,
1120 #ifdef CONFIG_PERF_EVENTS
1122 * User-space scripts rely on the existence of this file
1123 * as a feature check for perf_events being enabled.
1125 * So it's an ABI, do not remove!
1128 .procname
= "perf_event_paranoid",
1129 .data
= &sysctl_perf_event_paranoid
,
1130 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1132 .proc_handler
= proc_dointvec
,
1135 .procname
= "perf_event_mlock_kb",
1136 .data
= &sysctl_perf_event_mlock
,
1137 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1139 .proc_handler
= proc_dointvec
,
1142 .procname
= "perf_event_max_sample_rate",
1143 .data
= &sysctl_perf_event_sample_rate
,
1144 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1146 .proc_handler
= perf_proc_update_handler
,
1150 .procname
= "perf_cpu_time_max_percent",
1151 .data
= &sysctl_perf_cpu_time_max_percent
,
1152 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1154 .proc_handler
= perf_cpu_time_max_percent_handler
,
1156 .extra2
= &one_hundred
,
1159 .procname
= "perf_event_max_stack",
1160 .data
= &sysctl_perf_event_max_stack
,
1161 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1163 .proc_handler
= perf_event_max_stack_handler
,
1165 .extra2
= &six_hundred_forty_kb
,
1168 .procname
= "perf_event_max_contexts_per_stack",
1169 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1170 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1172 .proc_handler
= perf_event_max_stack_handler
,
1174 .extra2
= &one_thousand
,
1177 #ifdef CONFIG_KMEMCHECK
1179 .procname
= "kmemcheck",
1180 .data
= &kmemcheck_enabled
,
1181 .maxlen
= sizeof(int),
1183 .proc_handler
= proc_dointvec
,
1187 .procname
= "panic_on_warn",
1188 .data
= &panic_on_warn
,
1189 .maxlen
= sizeof(int),
1191 .proc_handler
= proc_dointvec_minmax
,
1195 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1197 .procname
= "timer_migration",
1198 .data
= &sysctl_timer_migration
,
1199 .maxlen
= sizeof(unsigned int),
1201 .proc_handler
= timer_migration_handler
,
1206 #ifdef CONFIG_BPF_SYSCALL
1208 .procname
= "unprivileged_bpf_disabled",
1209 .data
= &sysctl_unprivileged_bpf_disabled
,
1210 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1212 /* only handle a transition from default "0" to "1" */
1213 .proc_handler
= proc_dointvec_minmax
,
1218 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1220 .procname
= "panic_on_rcu_stall",
1221 .data
= &sysctl_panic_on_rcu_stall
,
1222 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1224 .proc_handler
= proc_dointvec_minmax
,
1232 static struct ctl_table vm_table
[] = {
1234 .procname
= "overcommit_memory",
1235 .data
= &sysctl_overcommit_memory
,
1236 .maxlen
= sizeof(sysctl_overcommit_memory
),
1238 .proc_handler
= proc_dointvec_minmax
,
1243 .procname
= "panic_on_oom",
1244 .data
= &sysctl_panic_on_oom
,
1245 .maxlen
= sizeof(sysctl_panic_on_oom
),
1247 .proc_handler
= proc_dointvec_minmax
,
1252 .procname
= "oom_kill_allocating_task",
1253 .data
= &sysctl_oom_kill_allocating_task
,
1254 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1256 .proc_handler
= proc_dointvec
,
1259 .procname
= "oom_dump_tasks",
1260 .data
= &sysctl_oom_dump_tasks
,
1261 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1263 .proc_handler
= proc_dointvec
,
1266 .procname
= "overcommit_ratio",
1267 .data
= &sysctl_overcommit_ratio
,
1268 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1270 .proc_handler
= overcommit_ratio_handler
,
1273 .procname
= "overcommit_kbytes",
1274 .data
= &sysctl_overcommit_kbytes
,
1275 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1277 .proc_handler
= overcommit_kbytes_handler
,
1280 .procname
= "page-cluster",
1281 .data
= &page_cluster
,
1282 .maxlen
= sizeof(int),
1284 .proc_handler
= proc_dointvec_minmax
,
1288 .procname
= "dirty_background_ratio",
1289 .data
= &dirty_background_ratio
,
1290 .maxlen
= sizeof(dirty_background_ratio
),
1292 .proc_handler
= dirty_background_ratio_handler
,
1294 .extra2
= &one_hundred
,
1297 .procname
= "dirty_background_bytes",
1298 .data
= &dirty_background_bytes
,
1299 .maxlen
= sizeof(dirty_background_bytes
),
1301 .proc_handler
= dirty_background_bytes_handler
,
1305 .procname
= "dirty_ratio",
1306 .data
= &vm_dirty_ratio
,
1307 .maxlen
= sizeof(vm_dirty_ratio
),
1309 .proc_handler
= dirty_ratio_handler
,
1311 .extra2
= &one_hundred
,
1314 .procname
= "dirty_bytes",
1315 .data
= &vm_dirty_bytes
,
1316 .maxlen
= sizeof(vm_dirty_bytes
),
1318 .proc_handler
= dirty_bytes_handler
,
1319 .extra1
= &dirty_bytes_min
,
1322 .procname
= "dirty_writeback_centisecs",
1323 .data
= &dirty_writeback_interval
,
1324 .maxlen
= sizeof(dirty_writeback_interval
),
1326 .proc_handler
= dirty_writeback_centisecs_handler
,
1329 .procname
= "dirty_expire_centisecs",
1330 .data
= &dirty_expire_interval
,
1331 .maxlen
= sizeof(dirty_expire_interval
),
1333 .proc_handler
= proc_dointvec_minmax
,
1337 .procname
= "dirtytime_expire_seconds",
1338 .data
= &dirtytime_expire_interval
,
1339 .maxlen
= sizeof(dirty_expire_interval
),
1341 .proc_handler
= dirtytime_interval_handler
,
1345 .procname
= "nr_pdflush_threads",
1346 .mode
= 0444 /* read-only */,
1347 .proc_handler
= pdflush_proc_obsolete
,
1350 .procname
= "swappiness",
1351 .data
= &vm_swappiness
,
1352 .maxlen
= sizeof(vm_swappiness
),
1354 .proc_handler
= proc_dointvec_minmax
,
1356 .extra2
= &one_hundred
,
1358 #ifdef CONFIG_HUGETLB_PAGE
1360 .procname
= "nr_hugepages",
1362 .maxlen
= sizeof(unsigned long),
1364 .proc_handler
= hugetlb_sysctl_handler
,
1368 .procname
= "nr_hugepages_mempolicy",
1370 .maxlen
= sizeof(unsigned long),
1372 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1376 .procname
= "hugetlb_shm_group",
1377 .data
= &sysctl_hugetlb_shm_group
,
1378 .maxlen
= sizeof(gid_t
),
1380 .proc_handler
= proc_dointvec
,
1383 .procname
= "hugepages_treat_as_movable",
1384 .data
= &hugepages_treat_as_movable
,
1385 .maxlen
= sizeof(int),
1387 .proc_handler
= proc_dointvec
,
1390 .procname
= "nr_overcommit_hugepages",
1392 .maxlen
= sizeof(unsigned long),
1394 .proc_handler
= hugetlb_overcommit_handler
,
1398 .procname
= "lowmem_reserve_ratio",
1399 .data
= &sysctl_lowmem_reserve_ratio
,
1400 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1402 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1405 .procname
= "drop_caches",
1406 .data
= &sysctl_drop_caches
,
1407 .maxlen
= sizeof(int),
1409 .proc_handler
= drop_caches_sysctl_handler
,
1413 #ifdef CONFIG_COMPACTION
1415 .procname
= "compact_memory",
1416 .data
= &sysctl_compact_memory
,
1417 .maxlen
= sizeof(int),
1419 .proc_handler
= sysctl_compaction_handler
,
1422 .procname
= "extfrag_threshold",
1423 .data
= &sysctl_extfrag_threshold
,
1424 .maxlen
= sizeof(int),
1426 .proc_handler
= sysctl_extfrag_handler
,
1427 .extra1
= &min_extfrag_threshold
,
1428 .extra2
= &max_extfrag_threshold
,
1431 .procname
= "compact_unevictable_allowed",
1432 .data
= &sysctl_compact_unevictable_allowed
,
1433 .maxlen
= sizeof(int),
1435 .proc_handler
= proc_dointvec
,
1440 #endif /* CONFIG_COMPACTION */
1442 .procname
= "min_free_kbytes",
1443 .data
= &min_free_kbytes
,
1444 .maxlen
= sizeof(min_free_kbytes
),
1446 .proc_handler
= min_free_kbytes_sysctl_handler
,
1450 .procname
= "watermark_scale_factor",
1451 .data
= &watermark_scale_factor
,
1452 .maxlen
= sizeof(watermark_scale_factor
),
1454 .proc_handler
= watermark_scale_factor_sysctl_handler
,
1456 .extra2
= &one_thousand
,
1459 .procname
= "percpu_pagelist_fraction",
1460 .data
= &percpu_pagelist_fraction
,
1461 .maxlen
= sizeof(percpu_pagelist_fraction
),
1463 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1468 .procname
= "max_map_count",
1469 .data
= &sysctl_max_map_count
,
1470 .maxlen
= sizeof(sysctl_max_map_count
),
1472 .proc_handler
= proc_dointvec_minmax
,
1477 .procname
= "nr_trim_pages",
1478 .data
= &sysctl_nr_trim_pages
,
1479 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1481 .proc_handler
= proc_dointvec_minmax
,
1486 .procname
= "laptop_mode",
1487 .data
= &laptop_mode
,
1488 .maxlen
= sizeof(laptop_mode
),
1490 .proc_handler
= proc_dointvec_jiffies
,
1493 .procname
= "block_dump",
1494 .data
= &block_dump
,
1495 .maxlen
= sizeof(block_dump
),
1497 .proc_handler
= proc_dointvec
,
1501 .procname
= "vfs_cache_pressure",
1502 .data
= &sysctl_vfs_cache_pressure
,
1503 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1505 .proc_handler
= proc_dointvec
,
1508 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1510 .procname
= "legacy_va_layout",
1511 .data
= &sysctl_legacy_va_layout
,
1512 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1514 .proc_handler
= proc_dointvec
,
1520 .procname
= "zone_reclaim_mode",
1521 .data
= &node_reclaim_mode
,
1522 .maxlen
= sizeof(node_reclaim_mode
),
1524 .proc_handler
= proc_dointvec
,
1528 .procname
= "min_unmapped_ratio",
1529 .data
= &sysctl_min_unmapped_ratio
,
1530 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1532 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1534 .extra2
= &one_hundred
,
1537 .procname
= "min_slab_ratio",
1538 .data
= &sysctl_min_slab_ratio
,
1539 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1541 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1543 .extra2
= &one_hundred
,
1548 .procname
= "stat_interval",
1549 .data
= &sysctl_stat_interval
,
1550 .maxlen
= sizeof(sysctl_stat_interval
),
1552 .proc_handler
= proc_dointvec_jiffies
,
1555 .procname
= "stat_refresh",
1559 .proc_handler
= vmstat_refresh
,
1564 .procname
= "mmap_min_addr",
1565 .data
= &dac_mmap_min_addr
,
1566 .maxlen
= sizeof(unsigned long),
1568 .proc_handler
= mmap_min_addr_handler
,
1573 .procname
= "numa_zonelist_order",
1574 .data
= &numa_zonelist_order
,
1575 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1577 .proc_handler
= numa_zonelist_order_handler
,
1580 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1581 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1583 .procname
= "vdso_enabled",
1584 #ifdef CONFIG_X86_32
1585 .data
= &vdso32_enabled
,
1586 .maxlen
= sizeof(vdso32_enabled
),
1588 .data
= &vdso_enabled
,
1589 .maxlen
= sizeof(vdso_enabled
),
1592 .proc_handler
= proc_dointvec
,
1596 #ifdef CONFIG_HIGHMEM
1598 .procname
= "highmem_is_dirtyable",
1599 .data
= &vm_highmem_is_dirtyable
,
1600 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1602 .proc_handler
= proc_dointvec_minmax
,
1607 #ifdef CONFIG_MEMORY_FAILURE
1609 .procname
= "memory_failure_early_kill",
1610 .data
= &sysctl_memory_failure_early_kill
,
1611 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1613 .proc_handler
= proc_dointvec_minmax
,
1618 .procname
= "memory_failure_recovery",
1619 .data
= &sysctl_memory_failure_recovery
,
1620 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1622 .proc_handler
= proc_dointvec_minmax
,
1628 .procname
= "user_reserve_kbytes",
1629 .data
= &sysctl_user_reserve_kbytes
,
1630 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1632 .proc_handler
= proc_doulongvec_minmax
,
1635 .procname
= "admin_reserve_kbytes",
1636 .data
= &sysctl_admin_reserve_kbytes
,
1637 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1639 .proc_handler
= proc_doulongvec_minmax
,
1641 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1643 .procname
= "mmap_rnd_bits",
1644 .data
= &mmap_rnd_bits
,
1645 .maxlen
= sizeof(mmap_rnd_bits
),
1647 .proc_handler
= proc_dointvec_minmax
,
1648 .extra1
= (void *)&mmap_rnd_bits_min
,
1649 .extra2
= (void *)&mmap_rnd_bits_max
,
1652 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1654 .procname
= "mmap_rnd_compat_bits",
1655 .data
= &mmap_rnd_compat_bits
,
1656 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1658 .proc_handler
= proc_dointvec_minmax
,
1659 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1660 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1666 static struct ctl_table fs_table
[] = {
1668 .procname
= "inode-nr",
1669 .data
= &inodes_stat
,
1670 .maxlen
= 2*sizeof(long),
1672 .proc_handler
= proc_nr_inodes
,
1675 .procname
= "inode-state",
1676 .data
= &inodes_stat
,
1677 .maxlen
= 7*sizeof(long),
1679 .proc_handler
= proc_nr_inodes
,
1682 .procname
= "file-nr",
1683 .data
= &files_stat
,
1684 .maxlen
= sizeof(files_stat
),
1686 .proc_handler
= proc_nr_files
,
1689 .procname
= "file-max",
1690 .data
= &files_stat
.max_files
,
1691 .maxlen
= sizeof(files_stat
.max_files
),
1693 .proc_handler
= proc_doulongvec_minmax
,
1696 .procname
= "nr_open",
1697 .data
= &sysctl_nr_open
,
1698 .maxlen
= sizeof(unsigned int),
1700 .proc_handler
= proc_dointvec_minmax
,
1701 .extra1
= &sysctl_nr_open_min
,
1702 .extra2
= &sysctl_nr_open_max
,
1705 .procname
= "dentry-state",
1706 .data
= &dentry_stat
,
1707 .maxlen
= 6*sizeof(long),
1709 .proc_handler
= proc_nr_dentry
,
1712 .procname
= "overflowuid",
1713 .data
= &fs_overflowuid
,
1714 .maxlen
= sizeof(int),
1716 .proc_handler
= proc_dointvec_minmax
,
1717 .extra1
= &minolduid
,
1718 .extra2
= &maxolduid
,
1721 .procname
= "overflowgid",
1722 .data
= &fs_overflowgid
,
1723 .maxlen
= sizeof(int),
1725 .proc_handler
= proc_dointvec_minmax
,
1726 .extra1
= &minolduid
,
1727 .extra2
= &maxolduid
,
1729 #ifdef CONFIG_FILE_LOCKING
1731 .procname
= "leases-enable",
1732 .data
= &leases_enable
,
1733 .maxlen
= sizeof(int),
1735 .proc_handler
= proc_dointvec
,
1738 #ifdef CONFIG_DNOTIFY
1740 .procname
= "dir-notify-enable",
1741 .data
= &dir_notify_enable
,
1742 .maxlen
= sizeof(int),
1744 .proc_handler
= proc_dointvec
,
1748 #ifdef CONFIG_FILE_LOCKING
1750 .procname
= "lease-break-time",
1751 .data
= &lease_break_time
,
1752 .maxlen
= sizeof(int),
1754 .proc_handler
= proc_dointvec
,
1759 .procname
= "aio-nr",
1761 .maxlen
= sizeof(aio_nr
),
1763 .proc_handler
= proc_doulongvec_minmax
,
1766 .procname
= "aio-max-nr",
1767 .data
= &aio_max_nr
,
1768 .maxlen
= sizeof(aio_max_nr
),
1770 .proc_handler
= proc_doulongvec_minmax
,
1772 #endif /* CONFIG_AIO */
1773 #ifdef CONFIG_INOTIFY_USER
1775 .procname
= "inotify",
1777 .child
= inotify_table
,
1782 .procname
= "epoll",
1784 .child
= epoll_table
,
1789 .procname
= "protected_symlinks",
1790 .data
= &sysctl_protected_symlinks
,
1791 .maxlen
= sizeof(int),
1793 .proc_handler
= proc_dointvec_minmax
,
1798 .procname
= "protected_hardlinks",
1799 .data
= &sysctl_protected_hardlinks
,
1800 .maxlen
= sizeof(int),
1802 .proc_handler
= proc_dointvec_minmax
,
1807 .procname
= "suid_dumpable",
1808 .data
= &suid_dumpable
,
1809 .maxlen
= sizeof(int),
1811 .proc_handler
= proc_dointvec_minmax_coredump
,
1815 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1817 .procname
= "binfmt_misc",
1819 .child
= sysctl_mount_point
,
1823 .procname
= "pipe-max-size",
1824 .data
= &pipe_max_size
,
1825 .maxlen
= sizeof(int),
1827 .proc_handler
= &pipe_proc_fn
,
1828 .extra1
= &pipe_min_size
,
1831 .procname
= "pipe-user-pages-hard",
1832 .data
= &pipe_user_pages_hard
,
1833 .maxlen
= sizeof(pipe_user_pages_hard
),
1835 .proc_handler
= proc_doulongvec_minmax
,
1838 .procname
= "pipe-user-pages-soft",
1839 .data
= &pipe_user_pages_soft
,
1840 .maxlen
= sizeof(pipe_user_pages_soft
),
1842 .proc_handler
= proc_doulongvec_minmax
,
1845 .procname
= "mount-max",
1846 .data
= &sysctl_mount_max
,
1847 .maxlen
= sizeof(unsigned int),
1849 .proc_handler
= proc_dointvec_minmax
,
1855 static struct ctl_table debug_table
[] = {
1856 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1858 .procname
= "exception-trace",
1859 .data
= &show_unhandled_signals
,
1860 .maxlen
= sizeof(int),
1862 .proc_handler
= proc_dointvec
1865 #if defined(CONFIG_OPTPROBES)
1867 .procname
= "kprobes-optimization",
1868 .data
= &sysctl_kprobes_optimization
,
1869 .maxlen
= sizeof(int),
1871 .proc_handler
= proc_kprobes_optimization_handler
,
1879 static struct ctl_table dev_table
[] = {
1883 int __init
sysctl_init(void)
1885 struct ctl_table_header
*hdr
;
1887 hdr
= register_sysctl_table(sysctl_base_table
);
1888 kmemleak_not_leak(hdr
);
1892 #endif /* CONFIG_SYSCTL */
1898 #ifdef CONFIG_PROC_SYSCTL
1900 static int _proc_do_string(char *data
, int maxlen
, int write
,
1901 char __user
*buffer
,
1902 size_t *lenp
, loff_t
*ppos
)
1908 if (!data
|| !maxlen
|| !*lenp
) {
1914 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1915 /* Only continue writes not past the end of buffer. */
1917 if (len
> maxlen
- 1)
1924 /* Start writing from beginning of buffer. */
1930 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1931 if (get_user(c
, p
++))
1933 if (c
== 0 || c
== '\n')
1954 if (copy_to_user(buffer
, data
, len
))
1957 if (put_user('\n', buffer
+ len
))
1967 static void warn_sysctl_write(struct ctl_table
*table
)
1969 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1970 "This will not be supported in the future. To silence this\n"
1971 "warning, set kernel.sysctl_writes_strict = -1\n",
1972 current
->comm
, table
->procname
);
1976 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1977 * @ppos: file position
1978 * @table: the sysctl table
1980 * Returns true if the first position is non-zero and the sysctl_writes_strict
1981 * mode indicates this is not allowed for numeric input types. String proc
1982 * hadlers can ignore the return value.
1984 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
1985 struct ctl_table
*table
)
1990 switch (sysctl_writes_strict
) {
1991 case SYSCTL_WRITES_STRICT
:
1993 case SYSCTL_WRITES_WARN
:
1994 warn_sysctl_write(table
);
2002 * proc_dostring - read a string sysctl
2003 * @table: the sysctl table
2004 * @write: %TRUE if this is a write to the sysctl file
2005 * @buffer: the user buffer
2006 * @lenp: the size of the user buffer
2007 * @ppos: file position
2009 * Reads/writes a string from/to the user buffer. If the kernel
2010 * buffer provided is not large enough to hold the string, the
2011 * string is truncated. The copied string is %NULL-terminated.
2012 * If the string is being read by the user process, it is copied
2013 * and a newline '\n' is added. It is truncated if the buffer is
2016 * Returns 0 on success.
2018 int proc_dostring(struct ctl_table
*table
, int write
,
2019 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2022 proc_first_pos_non_zero_ignore(ppos
, table
);
2024 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2025 (char __user
*)buffer
, lenp
, ppos
);
2028 static size_t proc_skip_spaces(char **buf
)
2031 char *tmp
= skip_spaces(*buf
);
2037 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2047 #define TMPBUFLEN 22
2049 * proc_get_long - reads an ASCII formatted integer from a user buffer
2051 * @buf: a kernel buffer
2052 * @size: size of the kernel buffer
2053 * @val: this is where the number will be stored
2054 * @neg: set to %TRUE if number is negative
2055 * @perm_tr: a vector which contains the allowed trailers
2056 * @perm_tr_len: size of the perm_tr vector
2057 * @tr: pointer to store the trailer character
2059 * In case of success %0 is returned and @buf and @size are updated with
2060 * the amount of bytes read. If @tr is non-NULL and a trailing
2061 * character exists (size is non-zero after returning from this
2062 * function), @tr is updated with the trailing character.
2064 static int proc_get_long(char **buf
, size_t *size
,
2065 unsigned long *val
, bool *neg
,
2066 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2069 char *p
, tmp
[TMPBUFLEN
];
2075 if (len
> TMPBUFLEN
- 1)
2076 len
= TMPBUFLEN
- 1;
2078 memcpy(tmp
, *buf
, len
);
2082 if (*p
== '-' && *size
> 1) {
2090 *val
= simple_strtoul(p
, &p
, 0);
2094 /* We don't know if the next char is whitespace thus we may accept
2095 * invalid integers (e.g. 1234...a) or two integers instead of one
2096 * (e.g. 123...1). So lets not allow such large numbers. */
2097 if (len
== TMPBUFLEN
- 1)
2100 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2103 if (tr
&& (len
< *size
))
2113 * proc_put_long - converts an integer to a decimal ASCII formatted string
2115 * @buf: the user buffer
2116 * @size: the size of the user buffer
2117 * @val: the integer to be converted
2118 * @neg: sign of the number, %TRUE for negative
2120 * In case of success %0 is returned and @buf and @size are updated with
2121 * the amount of bytes written.
2123 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2127 char tmp
[TMPBUFLEN
], *p
= tmp
;
2129 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2133 if (copy_to_user(*buf
, tmp
, len
))
2141 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2144 char __user
**buffer
= (char __user
**)buf
;
2145 if (put_user(c
, *buffer
))
2147 (*size
)--, (*buffer
)++;
2153 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2155 int write
, void *data
)
2159 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2163 if (*lvalp
> (unsigned long) INT_MAX
)
2171 *lvalp
= -(unsigned long)val
;
2174 *lvalp
= (unsigned long)val
;
2180 static int do_proc_douintvec_conv(unsigned long *lvalp
,
2182 int write
, void *data
)
2185 if (*lvalp
> UINT_MAX
)
2189 unsigned int val
= *valp
;
2190 *lvalp
= (unsigned long)val
;
2195 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2197 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2198 int write
, void __user
*buffer
,
2199 size_t *lenp
, loff_t
*ppos
,
2200 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2201 int write
, void *data
),
2204 int *i
, vleft
, first
= 1, err
= 0;
2206 char *kbuf
= NULL
, *p
;
2208 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2213 i
= (int *) tbl_data
;
2214 vleft
= table
->maxlen
/ sizeof(*i
);
2218 conv
= do_proc_dointvec_conv
;
2221 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2224 if (left
> PAGE_SIZE
- 1)
2225 left
= PAGE_SIZE
- 1;
2226 p
= kbuf
= memdup_user_nul(buffer
, left
);
2228 return PTR_ERR(kbuf
);
2231 for (; left
&& vleft
--; i
++, first
=0) {
2236 left
-= proc_skip_spaces(&p
);
2240 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2242 sizeof(proc_wspace_sep
), NULL
);
2245 if (conv(&neg
, &lval
, i
, 1, data
)) {
2250 if (conv(&neg
, &lval
, i
, 0, data
)) {
2255 err
= proc_put_char(&buffer
, &left
, '\t');
2258 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2264 if (!write
&& !first
&& left
&& !err
)
2265 err
= proc_put_char(&buffer
, &left
, '\n');
2266 if (write
&& !err
&& left
)
2267 left
-= proc_skip_spaces(&p
);
2271 return err
? : -EINVAL
;
2279 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2280 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2281 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2282 int write
, void *data
),
2285 return __do_proc_dointvec(table
->data
, table
, write
,
2286 buffer
, lenp
, ppos
, conv
, data
);
2289 static int do_proc_douintvec_w(unsigned int *tbl_data
,
2290 struct ctl_table
*table
,
2291 void __user
*buffer
,
2292 size_t *lenp
, loff_t
*ppos
,
2293 int (*conv
)(unsigned long *lvalp
,
2295 int write
, void *data
),
2302 char *kbuf
= NULL
, *p
;
2306 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2309 if (left
> PAGE_SIZE
- 1)
2310 left
= PAGE_SIZE
- 1;
2312 p
= kbuf
= memdup_user_nul(buffer
, left
);
2316 left
-= proc_skip_spaces(&p
);
2322 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2324 sizeof(proc_wspace_sep
), NULL
);
2330 if (conv(&lval
, tbl_data
, 1, data
)) {
2336 left
-= proc_skip_spaces(&p
);
2345 /* This is in keeping with old __do_proc_dointvec() */
2351 static int do_proc_douintvec_r(unsigned int *tbl_data
, void __user
*buffer
,
2352 size_t *lenp
, loff_t
*ppos
,
2353 int (*conv
)(unsigned long *lvalp
,
2355 int write
, void *data
),
2364 if (conv(&lval
, tbl_data
, 0, data
)) {
2369 err
= proc_put_long(&buffer
, &left
, lval
, false);
2373 err
= proc_put_char(&buffer
, &left
, '\n');
2382 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
2383 int write
, void __user
*buffer
,
2384 size_t *lenp
, loff_t
*ppos
,
2385 int (*conv
)(unsigned long *lvalp
,
2387 int write
, void *data
),
2390 unsigned int *i
, vleft
;
2392 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2397 i
= (unsigned int *) tbl_data
;
2398 vleft
= table
->maxlen
/ sizeof(*i
);
2401 * Arrays are not supported, keep this simple. *Do not* add
2410 conv
= do_proc_douintvec_conv
;
2413 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
2415 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
2418 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
2419 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2420 int (*conv
)(unsigned long *lvalp
,
2422 int write
, void *data
),
2425 return __do_proc_douintvec(table
->data
, table
, write
,
2426 buffer
, lenp
, ppos
, conv
, data
);
2430 * proc_dointvec - read a vector of integers
2431 * @table: the sysctl table
2432 * @write: %TRUE if this is a write to the sysctl file
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438 * values from/to the user buffer, treated as an ASCII string.
2440 * Returns 0 on success.
2442 int proc_dointvec(struct ctl_table
*table
, int write
,
2443 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2445 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2449 * proc_douintvec - read a vector of unsigned integers
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2457 * values from/to the user buffer, treated as an ASCII string.
2459 * Returns 0 on success.
2461 int proc_douintvec(struct ctl_table
*table
, int write
,
2462 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2464 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2465 do_proc_douintvec_conv
, NULL
);
2469 * Taint values can only be increased
2470 * This means we can safely use a temporary.
2472 static int proc_taint(struct ctl_table
*table
, int write
,
2473 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2476 unsigned long tmptaint
= get_taint();
2479 if (write
&& !capable(CAP_SYS_ADMIN
))
2484 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2490 * Poor man's atomic or. Not worth adding a primitive
2491 * to everyone's atomic.h for this
2494 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2495 if ((tmptaint
>> i
) & 1)
2496 add_taint(i
, LOCKDEP_STILL_OK
);
2503 #ifdef CONFIG_PRINTK
2504 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2505 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2507 if (write
&& !capable(CAP_SYS_ADMIN
))
2510 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2514 struct do_proc_dointvec_minmax_conv_param
{
2519 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2521 int write
, void *data
)
2523 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2525 int val
= *negp
? -*lvalp
: *lvalp
;
2526 if ((param
->min
&& *param
->min
> val
) ||
2527 (param
->max
&& *param
->max
< val
))
2534 *lvalp
= -(unsigned long)val
;
2537 *lvalp
= (unsigned long)val
;
2544 * proc_dointvec_minmax - read a vector of integers with min/max values
2545 * @table: the sysctl table
2546 * @write: %TRUE if this is a write to the sysctl file
2547 * @buffer: the user buffer
2548 * @lenp: the size of the user buffer
2549 * @ppos: file position
2551 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2552 * values from/to the user buffer, treated as an ASCII string.
2554 * This routine will ensure the values are within the range specified by
2555 * table->extra1 (min) and table->extra2 (max).
2557 * Returns 0 on success.
2559 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2560 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2562 struct do_proc_dointvec_minmax_conv_param param
= {
2563 .min
= (int *) table
->extra1
,
2564 .max
= (int *) table
->extra2
,
2566 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2567 do_proc_dointvec_minmax_conv
, ¶m
);
2570 struct do_proc_douintvec_minmax_conv_param
{
2575 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
2577 int write
, void *data
)
2579 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
2582 unsigned int val
= *lvalp
;
2584 if ((param
->min
&& *param
->min
> val
) ||
2585 (param
->max
&& *param
->max
< val
))
2588 if (*lvalp
> UINT_MAX
)
2592 unsigned int val
= *valp
;
2593 *lvalp
= (unsigned long) val
;
2600 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2601 * @table: the sysctl table
2602 * @write: %TRUE if this is a write to the sysctl file
2603 * @buffer: the user buffer
2604 * @lenp: the size of the user buffer
2605 * @ppos: file position
2607 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2608 * values from/to the user buffer, treated as an ASCII string. Negative
2609 * strings are not allowed.
2611 * This routine will ensure the values are within the range specified by
2612 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2613 * check for UINT_MAX to avoid having to support wrap around uses from
2616 * Returns 0 on success.
2618 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
2619 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2621 struct do_proc_douintvec_minmax_conv_param param
= {
2622 .min
= (unsigned int *) table
->extra1
,
2623 .max
= (unsigned int *) table
->extra2
,
2625 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2626 do_proc_douintvec_minmax_conv
, ¶m
);
2629 static void validate_coredump_safety(void)
2631 #ifdef CONFIG_COREDUMP
2632 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2633 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2635 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2636 "Pipe handler or fully qualified core dump path required.\n"
2637 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2643 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2644 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2646 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2648 validate_coredump_safety();
2652 #ifdef CONFIG_COREDUMP
2653 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2654 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2656 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2658 validate_coredump_safety();
2663 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2664 void __user
*buffer
,
2665 size_t *lenp
, loff_t
*ppos
,
2666 unsigned long convmul
,
2667 unsigned long convdiv
)
2669 unsigned long *i
, *min
, *max
;
2670 int vleft
, first
= 1, err
= 0;
2672 char *kbuf
= NULL
, *p
;
2674 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2679 i
= (unsigned long *) data
;
2680 min
= (unsigned long *) table
->extra1
;
2681 max
= (unsigned long *) table
->extra2
;
2682 vleft
= table
->maxlen
/ sizeof(unsigned long);
2686 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2689 if (left
> PAGE_SIZE
- 1)
2690 left
= PAGE_SIZE
- 1;
2691 p
= kbuf
= memdup_user_nul(buffer
, left
);
2693 return PTR_ERR(kbuf
);
2696 for (; left
&& vleft
--; i
++, first
= 0) {
2702 left
-= proc_skip_spaces(&p
);
2704 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2706 sizeof(proc_wspace_sep
), NULL
);
2711 val
= convmul
* val
/ convdiv
;
2712 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2716 val
= convdiv
* (*i
) / convmul
;
2718 err
= proc_put_char(&buffer
, &left
, '\t');
2722 err
= proc_put_long(&buffer
, &left
, val
, false);
2728 if (!write
&& !first
&& left
&& !err
)
2729 err
= proc_put_char(&buffer
, &left
, '\n');
2731 left
-= proc_skip_spaces(&p
);
2735 return err
? : -EINVAL
;
2743 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2744 void __user
*buffer
,
2745 size_t *lenp
, loff_t
*ppos
,
2746 unsigned long convmul
,
2747 unsigned long convdiv
)
2749 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2750 buffer
, lenp
, ppos
, convmul
, convdiv
);
2754 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2755 * @table: the sysctl table
2756 * @write: %TRUE if this is a write to the sysctl file
2757 * @buffer: the user buffer
2758 * @lenp: the size of the user buffer
2759 * @ppos: file position
2761 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2762 * values from/to the user buffer, treated as an ASCII string.
2764 * This routine will ensure the values are within the range specified by
2765 * table->extra1 (min) and table->extra2 (max).
2767 * Returns 0 on success.
2769 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2770 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2772 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2776 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2777 * @table: the sysctl table
2778 * @write: %TRUE if this is a write to the sysctl file
2779 * @buffer: the user buffer
2780 * @lenp: the size of the user buffer
2781 * @ppos: file position
2783 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2784 * values from/to the user buffer, treated as an ASCII string. The values
2785 * are treated as milliseconds, and converted to jiffies when they are stored.
2787 * This routine will ensure the values are within the range specified by
2788 * table->extra1 (min) and table->extra2 (max).
2790 * Returns 0 on success.
2792 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2793 void __user
*buffer
,
2794 size_t *lenp
, loff_t
*ppos
)
2796 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2797 lenp
, ppos
, HZ
, 1000l);
2801 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2803 int write
, void *data
)
2806 if (*lvalp
> INT_MAX
/ HZ
)
2808 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2814 lval
= -(unsigned long)val
;
2817 lval
= (unsigned long)val
;
2824 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2826 int write
, void *data
)
2829 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2831 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2837 lval
= -(unsigned long)val
;
2840 lval
= (unsigned long)val
;
2842 *lvalp
= jiffies_to_clock_t(lval
);
2847 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2849 int write
, void *data
)
2852 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2862 lval
= -(unsigned long)val
;
2865 lval
= (unsigned long)val
;
2867 *lvalp
= jiffies_to_msecs(lval
);
2873 * proc_dointvec_jiffies - read a vector of integers as seconds
2874 * @table: the sysctl table
2875 * @write: %TRUE if this is a write to the sysctl file
2876 * @buffer: the user buffer
2877 * @lenp: the size of the user buffer
2878 * @ppos: file position
2880 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2881 * values from/to the user buffer, treated as an ASCII string.
2882 * The values read are assumed to be in seconds, and are converted into
2885 * Returns 0 on success.
2887 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2888 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2890 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2891 do_proc_dointvec_jiffies_conv
,NULL
);
2895 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2896 * @table: the sysctl table
2897 * @write: %TRUE if this is a write to the sysctl file
2898 * @buffer: the user buffer
2899 * @lenp: the size of the user buffer
2900 * @ppos: pointer to the file position
2902 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2903 * values from/to the user buffer, treated as an ASCII string.
2904 * The values read are assumed to be in 1/USER_HZ seconds, and
2905 * are converted into jiffies.
2907 * Returns 0 on success.
2909 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2910 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2912 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2913 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2917 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2918 * @table: the sysctl table
2919 * @write: %TRUE if this is a write to the sysctl file
2920 * @buffer: the user buffer
2921 * @lenp: the size of the user buffer
2922 * @ppos: file position
2923 * @ppos: the current position in the file
2925 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2926 * values from/to the user buffer, treated as an ASCII string.
2927 * The values read are assumed to be in 1/1000 seconds, and
2928 * are converted into jiffies.
2930 * Returns 0 on success.
2932 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2933 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2935 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2936 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2939 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2940 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2942 struct pid
*new_pid
;
2946 tmp
= pid_vnr(cad_pid
);
2948 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2949 lenp
, ppos
, NULL
, NULL
);
2953 new_pid
= find_get_pid(tmp
);
2957 put_pid(xchg(&cad_pid
, new_pid
));
2962 * proc_do_large_bitmap - read/write from/to a large bitmap
2963 * @table: the sysctl table
2964 * @write: %TRUE if this is a write to the sysctl file
2965 * @buffer: the user buffer
2966 * @lenp: the size of the user buffer
2967 * @ppos: file position
2969 * The bitmap is stored at table->data and the bitmap length (in bits)
2972 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2973 * large bitmaps may be represented in a compact manner. Writing into
2974 * the file will clear the bitmap then update it with the given input.
2976 * Returns 0 on success.
2978 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2979 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2983 size_t left
= *lenp
;
2984 unsigned long bitmap_len
= table
->maxlen
;
2985 unsigned long *bitmap
= *(unsigned long **) table
->data
;
2986 unsigned long *tmp_bitmap
= NULL
;
2987 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2989 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2997 if (left
> PAGE_SIZE
- 1)
2998 left
= PAGE_SIZE
- 1;
3000 p
= kbuf
= memdup_user_nul(buffer
, left
);
3002 return PTR_ERR(kbuf
);
3004 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
3010 proc_skip_char(&p
, &left
, '\n');
3011 while (!err
&& left
) {
3012 unsigned long val_a
, val_b
;
3015 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
3019 if (val_a
>= bitmap_len
|| neg
) {
3031 err
= proc_get_long(&p
, &left
, &val_b
,
3032 &neg
, tr_b
, sizeof(tr_b
),
3036 if (val_b
>= bitmap_len
|| neg
||
3047 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
3049 proc_skip_char(&p
, &left
, '\n');
3053 unsigned long bit_a
, bit_b
= 0;
3056 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
3057 if (bit_a
>= bitmap_len
)
3059 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
3063 err
= proc_put_char(&buffer
, &left
, ',');
3067 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
3070 if (bit_a
!= bit_b
) {
3071 err
= proc_put_char(&buffer
, &left
, '-');
3074 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
3082 err
= proc_put_char(&buffer
, &left
, '\n');
3088 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
3090 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3102 #else /* CONFIG_PROC_SYSCTL */
3104 int proc_dostring(struct ctl_table
*table
, int write
,
3105 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3110 int proc_dointvec(struct ctl_table
*table
, int write
,
3111 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3116 int proc_douintvec(struct ctl_table
*table
, int write
,
3117 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3122 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3123 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3128 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
3129 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3134 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3135 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3140 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3141 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3146 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3152 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3158 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3159 void __user
*buffer
,
3160 size_t *lenp
, loff_t
*ppos
)
3166 #endif /* CONFIG_PROC_SYSCTL */
3169 * No sense putting this after each symbol definition, twice,
3170 * exception granted :-)
3172 EXPORT_SYMBOL(proc_dointvec
);
3173 EXPORT_SYMBOL(proc_douintvec
);
3174 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3175 EXPORT_SYMBOL(proc_dointvec_minmax
);
3176 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3177 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3178 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3179 EXPORT_SYMBOL(proc_dostring
);
3180 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3181 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);