2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69 #include <linux/efi.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
180 #define SYSCTL_WRITES_LEGACY -1
181 #define SYSCTL_WRITES_WARN 0
182 #define SYSCTL_WRITES_STRICT 1
184 static int sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
186 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
187 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
188 static int proc_taint(struct ctl_table
*table
, int write
,
189 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
193 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
194 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
197 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
198 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
199 #ifdef CONFIG_COREDUMP
200 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
201 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
204 #ifdef CONFIG_MAGIC_SYSRQ
205 /* Note: sysrq code uses it's own private copy */
206 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
208 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
209 void __user
*buffer
, size_t *lenp
,
214 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
219 sysrq_toggle_support(__sysrq_enabled
);
226 static struct ctl_table kern_table
[];
227 static struct ctl_table vm_table
[];
228 static struct ctl_table fs_table
[];
229 static struct ctl_table debug_table
[];
230 static struct ctl_table dev_table
[];
231 extern struct ctl_table random_table
[];
233 extern struct ctl_table epoll_table
[];
236 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
237 int sysctl_legacy_va_layout
;
240 /* The default sysctl tables: */
242 static struct ctl_table sysctl_base_table
[] = {
244 .procname
= "kernel",
261 .child
= debug_table
,
271 #ifdef CONFIG_SCHED_DEBUG
272 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
273 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
274 static int min_wakeup_granularity_ns
; /* 0 usecs */
275 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
277 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
278 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
279 #endif /* CONFIG_SMP */
280 #endif /* CONFIG_SCHED_DEBUG */
282 #ifdef CONFIG_COMPACTION
283 static int min_extfrag_threshold
;
284 static int max_extfrag_threshold
= 1000;
287 static unsigned int secure_boot_enabled
;
288 int secure_boot_proc_handler(struct ctl_table
*table
, int write
,
289 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
291 secure_boot_enabled
= efi_enabled(EFI_SECURE_BOOT
);
292 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
295 static unsigned int moksbstate_disabled
;
296 int moksbstate_disabled_proc_handler(struct ctl_table
*table
, int write
,
297 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
299 moksbstate_disabled
= efi_enabled(EFI_MOKSBSTATE_DISABLED
);
300 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
303 static struct ctl_table kern_table
[] = {
305 .procname
= "secure_boot",
306 .data
= &secure_boot_enabled
,
307 .maxlen
= sizeof(unsigned int),
309 .proc_handler
= secure_boot_proc_handler
,
312 .procname
= "moksbstate_disabled",
313 .data
= &moksbstate_disabled
,
314 .maxlen
= sizeof(unsigned int),
316 .proc_handler
= moksbstate_disabled_proc_handler
,
319 .procname
= "sched_child_runs_first",
320 .data
= &sysctl_sched_child_runs_first
,
321 .maxlen
= sizeof(unsigned int),
323 .proc_handler
= proc_dointvec
,
325 #ifdef CONFIG_SCHED_DEBUG
327 .procname
= "sched_min_granularity_ns",
328 .data
= &sysctl_sched_min_granularity
,
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_latency_ns",
337 .data
= &sysctl_sched_latency
,
338 .maxlen
= sizeof(unsigned int),
340 .proc_handler
= sched_proc_update_handler
,
341 .extra1
= &min_sched_granularity_ns
,
342 .extra2
= &max_sched_granularity_ns
,
345 .procname
= "sched_wakeup_granularity_ns",
346 .data
= &sysctl_sched_wakeup_granularity
,
347 .maxlen
= sizeof(unsigned int),
349 .proc_handler
= sched_proc_update_handler
,
350 .extra1
= &min_wakeup_granularity_ns
,
351 .extra2
= &max_wakeup_granularity_ns
,
355 .procname
= "sched_tunable_scaling",
356 .data
= &sysctl_sched_tunable_scaling
,
357 .maxlen
= sizeof(enum sched_tunable_scaling
),
359 .proc_handler
= sched_proc_update_handler
,
360 .extra1
= &min_sched_tunable_scaling
,
361 .extra2
= &max_sched_tunable_scaling
,
364 .procname
= "sched_migration_cost_ns",
365 .data
= &sysctl_sched_migration_cost
,
366 .maxlen
= sizeof(unsigned int),
368 .proc_handler
= proc_dointvec
,
371 .procname
= "sched_nr_migrate",
372 .data
= &sysctl_sched_nr_migrate
,
373 .maxlen
= sizeof(unsigned int),
375 .proc_handler
= proc_dointvec
,
378 .procname
= "sched_time_avg_ms",
379 .data
= &sysctl_sched_time_avg
,
380 .maxlen
= sizeof(unsigned int),
382 .proc_handler
= proc_dointvec
,
384 #ifdef CONFIG_SCHEDSTATS
386 .procname
= "sched_schedstats",
388 .maxlen
= sizeof(unsigned int),
390 .proc_handler
= sysctl_schedstats
,
394 #endif /* CONFIG_SCHEDSTATS */
395 #endif /* CONFIG_SMP */
396 #ifdef CONFIG_NUMA_BALANCING
398 .procname
= "numa_balancing_scan_delay_ms",
399 .data
= &sysctl_numa_balancing_scan_delay
,
400 .maxlen
= sizeof(unsigned int),
402 .proc_handler
= proc_dointvec
,
405 .procname
= "numa_balancing_scan_period_min_ms",
406 .data
= &sysctl_numa_balancing_scan_period_min
,
407 .maxlen
= sizeof(unsigned int),
409 .proc_handler
= proc_dointvec
,
412 .procname
= "numa_balancing_scan_period_max_ms",
413 .data
= &sysctl_numa_balancing_scan_period_max
,
414 .maxlen
= sizeof(unsigned int),
416 .proc_handler
= proc_dointvec
,
419 .procname
= "numa_balancing_scan_size_mb",
420 .data
= &sysctl_numa_balancing_scan_size
,
421 .maxlen
= sizeof(unsigned int),
423 .proc_handler
= proc_dointvec_minmax
,
427 .procname
= "numa_balancing",
428 .data
= NULL
, /* filled in by handler */
429 .maxlen
= sizeof(unsigned int),
431 .proc_handler
= sysctl_numa_balancing
,
435 #endif /* CONFIG_NUMA_BALANCING */
436 #endif /* CONFIG_SCHED_DEBUG */
438 .procname
= "sched_rt_period_us",
439 .data
= &sysctl_sched_rt_period
,
440 .maxlen
= sizeof(unsigned int),
442 .proc_handler
= sched_rt_handler
,
445 .procname
= "sched_rt_runtime_us",
446 .data
= &sysctl_sched_rt_runtime
,
447 .maxlen
= sizeof(int),
449 .proc_handler
= sched_rt_handler
,
452 .procname
= "sched_rr_timeslice_ms",
453 .data
= &sched_rr_timeslice
,
454 .maxlen
= sizeof(int),
456 .proc_handler
= sched_rr_handler
,
458 #ifdef CONFIG_SCHED_AUTOGROUP
460 .procname
= "sched_autogroup_enabled",
461 .data
= &sysctl_sched_autogroup_enabled
,
462 .maxlen
= sizeof(unsigned int),
464 .proc_handler
= proc_dointvec_minmax
,
469 #ifdef CONFIG_CFS_BANDWIDTH
471 .procname
= "sched_cfs_bandwidth_slice_us",
472 .data
= &sysctl_sched_cfs_bandwidth_slice
,
473 .maxlen
= sizeof(unsigned int),
475 .proc_handler
= proc_dointvec_minmax
,
479 #ifdef CONFIG_PROVE_LOCKING
481 .procname
= "prove_locking",
482 .data
= &prove_locking
,
483 .maxlen
= sizeof(int),
485 .proc_handler
= proc_dointvec
,
488 #ifdef CONFIG_LOCK_STAT
490 .procname
= "lock_stat",
492 .maxlen
= sizeof(int),
494 .proc_handler
= proc_dointvec
,
499 .data
= &panic_timeout
,
500 .maxlen
= sizeof(int),
502 .proc_handler
= proc_dointvec
,
504 #ifdef CONFIG_COREDUMP
506 .procname
= "core_uses_pid",
507 .data
= &core_uses_pid
,
508 .maxlen
= sizeof(int),
510 .proc_handler
= proc_dointvec
,
513 .procname
= "core_pattern",
514 .data
= core_pattern
,
515 .maxlen
= CORENAME_MAX_SIZE
,
517 .proc_handler
= proc_dostring_coredump
,
520 .procname
= "core_pipe_limit",
521 .data
= &core_pipe_limit
,
522 .maxlen
= sizeof(unsigned int),
524 .proc_handler
= proc_dointvec
,
527 #ifdef CONFIG_USER_NS
529 .procname
= "unprivileged_userns_clone",
530 .data
= &unprivileged_userns_clone
,
531 .maxlen
= sizeof(int),
533 .proc_handler
= proc_dointvec
,
536 #ifdef CONFIG_PROC_SYSCTL
538 .procname
= "tainted",
539 .maxlen
= sizeof(long),
541 .proc_handler
= proc_taint
,
544 .procname
= "sysctl_writes_strict",
545 .data
= &sysctl_writes_strict
,
546 .maxlen
= sizeof(int),
548 .proc_handler
= proc_dointvec_minmax
,
553 #ifdef CONFIG_LATENCYTOP
555 .procname
= "latencytop",
556 .data
= &latencytop_enabled
,
557 .maxlen
= sizeof(int),
559 .proc_handler
= sysctl_latencytop
,
562 #ifdef CONFIG_BLK_DEV_INITRD
564 .procname
= "real-root-dev",
565 .data
= &real_root_dev
,
566 .maxlen
= sizeof(int),
568 .proc_handler
= proc_dointvec
,
572 .procname
= "print-fatal-signals",
573 .data
= &print_fatal_signals
,
574 .maxlen
= sizeof(int),
576 .proc_handler
= proc_dointvec
,
580 .procname
= "reboot-cmd",
581 .data
= reboot_command
,
584 .proc_handler
= proc_dostring
,
587 .procname
= "stop-a",
588 .data
= &stop_a_enabled
,
589 .maxlen
= sizeof (int),
591 .proc_handler
= proc_dointvec
,
594 .procname
= "scons-poweroff",
595 .data
= &scons_pwroff
,
596 .maxlen
= sizeof (int),
598 .proc_handler
= proc_dointvec
,
601 #ifdef CONFIG_SPARC64
603 .procname
= "tsb-ratio",
604 .data
= &sysctl_tsb_ratio
,
605 .maxlen
= sizeof (int),
607 .proc_handler
= proc_dointvec
,
612 .procname
= "soft-power",
613 .data
= &pwrsw_enabled
,
614 .maxlen
= sizeof (int),
616 .proc_handler
= proc_dointvec
,
619 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
621 .procname
= "unaligned-trap",
622 .data
= &unaligned_enabled
,
623 .maxlen
= sizeof (int),
625 .proc_handler
= proc_dointvec
,
629 .procname
= "ctrl-alt-del",
631 .maxlen
= sizeof(int),
633 .proc_handler
= proc_dointvec
,
635 #ifdef CONFIG_FUNCTION_TRACER
637 .procname
= "ftrace_enabled",
638 .data
= &ftrace_enabled
,
639 .maxlen
= sizeof(int),
641 .proc_handler
= ftrace_enable_sysctl
,
644 #ifdef CONFIG_STACK_TRACER
646 .procname
= "stack_tracer_enabled",
647 .data
= &stack_tracer_enabled
,
648 .maxlen
= sizeof(int),
650 .proc_handler
= stack_trace_sysctl
,
653 #ifdef CONFIG_TRACING
655 .procname
= "ftrace_dump_on_oops",
656 .data
= &ftrace_dump_on_oops
,
657 .maxlen
= sizeof(int),
659 .proc_handler
= proc_dointvec
,
662 .procname
= "traceoff_on_warning",
663 .data
= &__disable_trace_on_warning
,
664 .maxlen
= sizeof(__disable_trace_on_warning
),
666 .proc_handler
= proc_dointvec
,
669 .procname
= "tracepoint_printk",
670 .data
= &tracepoint_printk
,
671 .maxlen
= sizeof(tracepoint_printk
),
673 .proc_handler
= tracepoint_printk_sysctl
,
676 #ifdef CONFIG_KEXEC_CORE
678 .procname
= "kexec_load_disabled",
679 .data
= &kexec_load_disabled
,
680 .maxlen
= sizeof(int),
682 /* only handle a transition from default "0" to "1" */
683 .proc_handler
= proc_dointvec_minmax
,
688 #ifdef CONFIG_MODULES
690 .procname
= "modprobe",
691 .data
= &modprobe_path
,
692 .maxlen
= KMOD_PATH_LEN
,
694 .proc_handler
= proc_dostring
,
697 .procname
= "modules_disabled",
698 .data
= &modules_disabled
,
699 .maxlen
= sizeof(int),
701 /* only handle a transition from default "0" to "1" */
702 .proc_handler
= proc_dointvec_minmax
,
707 #ifdef CONFIG_UEVENT_HELPER
709 .procname
= "hotplug",
710 .data
= &uevent_helper
,
711 .maxlen
= UEVENT_HELPER_PATH_LEN
,
713 .proc_handler
= proc_dostring
,
716 #ifdef CONFIG_CHR_DEV_SG
718 .procname
= "sg-big-buff",
719 .data
= &sg_big_buff
,
720 .maxlen
= sizeof (int),
722 .proc_handler
= proc_dointvec
,
725 #ifdef CONFIG_BSD_PROCESS_ACCT
729 .maxlen
= 3*sizeof(int),
731 .proc_handler
= proc_dointvec
,
734 #ifdef CONFIG_MAGIC_SYSRQ
737 .data
= &__sysrq_enabled
,
738 .maxlen
= sizeof (int),
740 .proc_handler
= sysrq_sysctl_handler
,
743 #ifdef CONFIG_PROC_SYSCTL
745 .procname
= "cad_pid",
747 .maxlen
= sizeof (int),
749 .proc_handler
= proc_do_cad_pid
,
753 .procname
= "threads-max",
755 .maxlen
= sizeof(int),
757 .proc_handler
= sysctl_max_threads
,
760 .procname
= "random",
762 .child
= random_table
,
765 .procname
= "usermodehelper",
767 .child
= usermodehelper_table
,
770 .procname
= "overflowuid",
771 .data
= &overflowuid
,
772 .maxlen
= sizeof(int),
774 .proc_handler
= proc_dointvec_minmax
,
775 .extra1
= &minolduid
,
776 .extra2
= &maxolduid
,
779 .procname
= "overflowgid",
780 .data
= &overflowgid
,
781 .maxlen
= sizeof(int),
783 .proc_handler
= proc_dointvec_minmax
,
784 .extra1
= &minolduid
,
785 .extra2
= &maxolduid
,
788 #ifdef CONFIG_MATHEMU
790 .procname
= "ieee_emulation_warnings",
791 .data
= &sysctl_ieee_emulation_warnings
,
792 .maxlen
= sizeof(int),
794 .proc_handler
= proc_dointvec
,
798 .procname
= "userprocess_debug",
799 .data
= &show_unhandled_signals
,
800 .maxlen
= sizeof(int),
802 .proc_handler
= proc_dointvec
,
806 .procname
= "pid_max",
808 .maxlen
= sizeof (int),
810 .proc_handler
= proc_dointvec_minmax
,
811 .extra1
= &pid_max_min
,
812 .extra2
= &pid_max_max
,
815 .procname
= "panic_on_oops",
816 .data
= &panic_on_oops
,
817 .maxlen
= sizeof(int),
819 .proc_handler
= proc_dointvec
,
821 #if defined CONFIG_PRINTK
823 .procname
= "printk",
824 .data
= &console_loglevel
,
825 .maxlen
= 4*sizeof(int),
827 .proc_handler
= proc_dointvec
,
830 .procname
= "printk_ratelimit",
831 .data
= &printk_ratelimit_state
.interval
,
832 .maxlen
= sizeof(int),
834 .proc_handler
= proc_dointvec_jiffies
,
837 .procname
= "printk_ratelimit_burst",
838 .data
= &printk_ratelimit_state
.burst
,
839 .maxlen
= sizeof(int),
841 .proc_handler
= proc_dointvec
,
844 .procname
= "printk_delay",
845 .data
= &printk_delay_msec
,
846 .maxlen
= sizeof(int),
848 .proc_handler
= proc_dointvec_minmax
,
850 .extra2
= &ten_thousand
,
853 .procname
= "printk_devkmsg",
854 .data
= devkmsg_log_str
,
855 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
857 .proc_handler
= devkmsg_sysctl_set_loglvl
,
860 .procname
= "dmesg_restrict",
861 .data
= &dmesg_restrict
,
862 .maxlen
= sizeof(int),
864 .proc_handler
= proc_dointvec_minmax_sysadmin
,
869 .procname
= "kptr_restrict",
870 .data
= &kptr_restrict
,
871 .maxlen
= sizeof(int),
873 .proc_handler
= proc_dointvec_minmax_sysadmin
,
879 .procname
= "ngroups_max",
880 .data
= &ngroups_max
,
881 .maxlen
= sizeof (int),
883 .proc_handler
= proc_dointvec
,
886 .procname
= "cap_last_cap",
887 .data
= (void *)&cap_last_cap
,
888 .maxlen
= sizeof(int),
890 .proc_handler
= proc_dointvec
,
892 #if defined(CONFIG_LOCKUP_DETECTOR)
894 .procname
= "watchdog",
895 .data
= &watchdog_user_enabled
,
896 .maxlen
= sizeof (int),
898 .proc_handler
= proc_watchdog
,
903 .procname
= "watchdog_thresh",
904 .data
= &watchdog_thresh
,
905 .maxlen
= sizeof(int),
907 .proc_handler
= proc_watchdog_thresh
,
912 .procname
= "nmi_watchdog",
913 .data
= &nmi_watchdog_enabled
,
914 .maxlen
= sizeof (int),
916 .proc_handler
= proc_nmi_watchdog
,
918 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
925 .procname
= "soft_watchdog",
926 .data
= &soft_watchdog_enabled
,
927 .maxlen
= sizeof (int),
929 .proc_handler
= proc_soft_watchdog
,
934 .procname
= "watchdog_cpumask",
935 .data
= &watchdog_cpumask_bits
,
938 .proc_handler
= proc_watchdog_cpumask
,
941 .procname
= "softlockup_panic",
942 .data
= &softlockup_panic
,
943 .maxlen
= sizeof(int),
945 .proc_handler
= proc_dointvec_minmax
,
949 #ifdef CONFIG_HARDLOCKUP_DETECTOR
951 .procname
= "hardlockup_panic",
952 .data
= &hardlockup_panic
,
953 .maxlen
= sizeof(int),
955 .proc_handler
= proc_dointvec_minmax
,
962 .procname
= "softlockup_all_cpu_backtrace",
963 .data
= &sysctl_softlockup_all_cpu_backtrace
,
964 .maxlen
= sizeof(int),
966 .proc_handler
= proc_dointvec_minmax
,
971 .procname
= "hardlockup_all_cpu_backtrace",
972 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
973 .maxlen
= sizeof(int),
975 .proc_handler
= proc_dointvec_minmax
,
979 #endif /* CONFIG_SMP */
981 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
983 .procname
= "unknown_nmi_panic",
984 .data
= &unknown_nmi_panic
,
985 .maxlen
= sizeof (int),
987 .proc_handler
= proc_dointvec
,
990 #if defined(CONFIG_X86)
992 .procname
= "panic_on_unrecovered_nmi",
993 .data
= &panic_on_unrecovered_nmi
,
994 .maxlen
= sizeof(int),
996 .proc_handler
= proc_dointvec
,
999 .procname
= "panic_on_io_nmi",
1000 .data
= &panic_on_io_nmi
,
1001 .maxlen
= sizeof(int),
1003 .proc_handler
= proc_dointvec
,
1005 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1007 .procname
= "panic_on_stackoverflow",
1008 .data
= &sysctl_panic_on_stackoverflow
,
1009 .maxlen
= sizeof(int),
1011 .proc_handler
= proc_dointvec
,
1015 .procname
= "bootloader_type",
1016 .data
= &bootloader_type
,
1017 .maxlen
= sizeof (int),
1019 .proc_handler
= proc_dointvec
,
1022 .procname
= "bootloader_version",
1023 .data
= &bootloader_version
,
1024 .maxlen
= sizeof (int),
1026 .proc_handler
= proc_dointvec
,
1029 .procname
= "io_delay_type",
1030 .data
= &io_delay_type
,
1031 .maxlen
= sizeof(int),
1033 .proc_handler
= proc_dointvec
,
1036 #if defined(CONFIG_MMU)
1038 .procname
= "randomize_va_space",
1039 .data
= &randomize_va_space
,
1040 .maxlen
= sizeof(int),
1042 .proc_handler
= proc_dointvec
,
1045 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1047 .procname
= "spin_retry",
1048 .data
= &spin_retry
,
1049 .maxlen
= sizeof (int),
1051 .proc_handler
= proc_dointvec
,
1054 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1056 .procname
= "acpi_video_flags",
1057 .data
= &acpi_realmode_flags
,
1058 .maxlen
= sizeof (unsigned long),
1060 .proc_handler
= proc_doulongvec_minmax
,
1063 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1065 .procname
= "ignore-unaligned-usertrap",
1066 .data
= &no_unaligned_warning
,
1067 .maxlen
= sizeof (int),
1069 .proc_handler
= proc_dointvec
,
1074 .procname
= "unaligned-dump-stack",
1075 .data
= &unaligned_dump_stack
,
1076 .maxlen
= sizeof (int),
1078 .proc_handler
= proc_dointvec
,
1081 #ifdef CONFIG_DETECT_HUNG_TASK
1083 .procname
= "hung_task_panic",
1084 .data
= &sysctl_hung_task_panic
,
1085 .maxlen
= sizeof(int),
1087 .proc_handler
= proc_dointvec_minmax
,
1092 .procname
= "hung_task_check_count",
1093 .data
= &sysctl_hung_task_check_count
,
1094 .maxlen
= sizeof(int),
1096 .proc_handler
= proc_dointvec_minmax
,
1100 .procname
= "hung_task_timeout_secs",
1101 .data
= &sysctl_hung_task_timeout_secs
,
1102 .maxlen
= sizeof(unsigned long),
1104 .proc_handler
= proc_dohung_task_timeout_secs
,
1105 .extra2
= &hung_task_timeout_max
,
1108 .procname
= "hung_task_warnings",
1109 .data
= &sysctl_hung_task_warnings
,
1110 .maxlen
= sizeof(int),
1112 .proc_handler
= proc_dointvec_minmax
,
1116 #ifdef CONFIG_RT_MUTEXES
1118 .procname
= "max_lock_depth",
1119 .data
= &max_lock_depth
,
1120 .maxlen
= sizeof(int),
1122 .proc_handler
= proc_dointvec
,
1126 .procname
= "poweroff_cmd",
1127 .data
= &poweroff_cmd
,
1128 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1130 .proc_handler
= proc_dostring
,
1136 .child
= key_sysctls
,
1139 #ifdef CONFIG_PERF_EVENTS
1141 * User-space scripts rely on the existence of this file
1142 * as a feature check for perf_events being enabled.
1144 * So it's an ABI, do not remove!
1147 .procname
= "perf_event_paranoid",
1148 .data
= &sysctl_perf_event_paranoid
,
1149 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1151 .proc_handler
= proc_dointvec
,
1154 .procname
= "perf_event_mlock_kb",
1155 .data
= &sysctl_perf_event_mlock
,
1156 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1158 .proc_handler
= proc_dointvec
,
1161 .procname
= "perf_event_max_sample_rate",
1162 .data
= &sysctl_perf_event_sample_rate
,
1163 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1165 .proc_handler
= perf_proc_update_handler
,
1169 .procname
= "perf_cpu_time_max_percent",
1170 .data
= &sysctl_perf_cpu_time_max_percent
,
1171 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1173 .proc_handler
= perf_cpu_time_max_percent_handler
,
1175 .extra2
= &one_hundred
,
1178 .procname
= "perf_event_max_stack",
1179 .data
= &sysctl_perf_event_max_stack
,
1180 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1182 .proc_handler
= perf_event_max_stack_handler
,
1184 .extra2
= &six_hundred_forty_kb
,
1187 .procname
= "perf_event_max_contexts_per_stack",
1188 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1189 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1191 .proc_handler
= perf_event_max_stack_handler
,
1193 .extra2
= &one_thousand
,
1196 #ifdef CONFIG_KMEMCHECK
1198 .procname
= "kmemcheck",
1199 .data
= &kmemcheck_enabled
,
1200 .maxlen
= sizeof(int),
1202 .proc_handler
= proc_dointvec
,
1206 .procname
= "panic_on_warn",
1207 .data
= &panic_on_warn
,
1208 .maxlen
= sizeof(int),
1210 .proc_handler
= proc_dointvec_minmax
,
1214 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1216 .procname
= "timer_migration",
1217 .data
= &sysctl_timer_migration
,
1218 .maxlen
= sizeof(unsigned int),
1220 .proc_handler
= timer_migration_handler
,
1223 #ifdef CONFIG_BPF_SYSCALL
1225 .procname
= "unprivileged_bpf_disabled",
1226 .data
= &sysctl_unprivileged_bpf_disabled
,
1227 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1229 /* only handle a transition from default "0" to "1" */
1230 .proc_handler
= proc_dointvec_minmax
,
1235 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1237 .procname
= "panic_on_rcu_stall",
1238 .data
= &sysctl_panic_on_rcu_stall
,
1239 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1241 .proc_handler
= proc_dointvec_minmax
,
1249 static struct ctl_table vm_table
[] = {
1251 .procname
= "overcommit_memory",
1252 .data
= &sysctl_overcommit_memory
,
1253 .maxlen
= sizeof(sysctl_overcommit_memory
),
1255 .proc_handler
= proc_dointvec_minmax
,
1260 .procname
= "panic_on_oom",
1261 .data
= &sysctl_panic_on_oom
,
1262 .maxlen
= sizeof(sysctl_panic_on_oom
),
1264 .proc_handler
= proc_dointvec_minmax
,
1269 .procname
= "oom_kill_allocating_task",
1270 .data
= &sysctl_oom_kill_allocating_task
,
1271 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1273 .proc_handler
= proc_dointvec
,
1276 .procname
= "oom_dump_tasks",
1277 .data
= &sysctl_oom_dump_tasks
,
1278 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1280 .proc_handler
= proc_dointvec
,
1283 .procname
= "overcommit_ratio",
1284 .data
= &sysctl_overcommit_ratio
,
1285 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1287 .proc_handler
= overcommit_ratio_handler
,
1290 .procname
= "overcommit_kbytes",
1291 .data
= &sysctl_overcommit_kbytes
,
1292 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1294 .proc_handler
= overcommit_kbytes_handler
,
1297 .procname
= "page-cluster",
1298 .data
= &page_cluster
,
1299 .maxlen
= sizeof(int),
1301 .proc_handler
= proc_dointvec_minmax
,
1305 .procname
= "dirty_background_ratio",
1306 .data
= &dirty_background_ratio
,
1307 .maxlen
= sizeof(dirty_background_ratio
),
1309 .proc_handler
= dirty_background_ratio_handler
,
1311 .extra2
= &one_hundred
,
1314 .procname
= "dirty_background_bytes",
1315 .data
= &dirty_background_bytes
,
1316 .maxlen
= sizeof(dirty_background_bytes
),
1318 .proc_handler
= dirty_background_bytes_handler
,
1322 .procname
= "dirty_ratio",
1323 .data
= &vm_dirty_ratio
,
1324 .maxlen
= sizeof(vm_dirty_ratio
),
1326 .proc_handler
= dirty_ratio_handler
,
1328 .extra2
= &one_hundred
,
1331 .procname
= "dirty_bytes",
1332 .data
= &vm_dirty_bytes
,
1333 .maxlen
= sizeof(vm_dirty_bytes
),
1335 .proc_handler
= dirty_bytes_handler
,
1336 .extra1
= &dirty_bytes_min
,
1339 .procname
= "dirty_writeback_centisecs",
1340 .data
= &dirty_writeback_interval
,
1341 .maxlen
= sizeof(dirty_writeback_interval
),
1343 .proc_handler
= dirty_writeback_centisecs_handler
,
1346 .procname
= "dirty_expire_centisecs",
1347 .data
= &dirty_expire_interval
,
1348 .maxlen
= sizeof(dirty_expire_interval
),
1350 .proc_handler
= proc_dointvec_minmax
,
1354 .procname
= "dirtytime_expire_seconds",
1355 .data
= &dirtytime_expire_interval
,
1356 .maxlen
= sizeof(dirty_expire_interval
),
1358 .proc_handler
= dirtytime_interval_handler
,
1362 .procname
= "nr_pdflush_threads",
1363 .mode
= 0444 /* read-only */,
1364 .proc_handler
= pdflush_proc_obsolete
,
1367 .procname
= "swappiness",
1368 .data
= &vm_swappiness
,
1369 .maxlen
= sizeof(vm_swappiness
),
1371 .proc_handler
= proc_dointvec_minmax
,
1373 .extra2
= &one_hundred
,
1375 #ifdef CONFIG_HUGETLB_PAGE
1377 .procname
= "nr_hugepages",
1379 .maxlen
= sizeof(unsigned long),
1381 .proc_handler
= hugetlb_sysctl_handler
,
1385 .procname
= "nr_hugepages_mempolicy",
1387 .maxlen
= sizeof(unsigned long),
1389 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1393 .procname
= "hugetlb_shm_group",
1394 .data
= &sysctl_hugetlb_shm_group
,
1395 .maxlen
= sizeof(gid_t
),
1397 .proc_handler
= proc_dointvec
,
1400 .procname
= "hugepages_treat_as_movable",
1401 .data
= &hugepages_treat_as_movable
,
1402 .maxlen
= sizeof(int),
1404 .proc_handler
= proc_dointvec
,
1407 .procname
= "nr_overcommit_hugepages",
1409 .maxlen
= sizeof(unsigned long),
1411 .proc_handler
= hugetlb_overcommit_handler
,
1415 .procname
= "lowmem_reserve_ratio",
1416 .data
= &sysctl_lowmem_reserve_ratio
,
1417 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1419 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1422 .procname
= "drop_caches",
1423 .data
= &sysctl_drop_caches
,
1424 .maxlen
= sizeof(int),
1426 .proc_handler
= drop_caches_sysctl_handler
,
1430 #ifdef CONFIG_COMPACTION
1432 .procname
= "compact_memory",
1433 .data
= &sysctl_compact_memory
,
1434 .maxlen
= sizeof(int),
1436 .proc_handler
= sysctl_compaction_handler
,
1439 .procname
= "extfrag_threshold",
1440 .data
= &sysctl_extfrag_threshold
,
1441 .maxlen
= sizeof(int),
1443 .proc_handler
= sysctl_extfrag_handler
,
1444 .extra1
= &min_extfrag_threshold
,
1445 .extra2
= &max_extfrag_threshold
,
1448 .procname
= "compact_unevictable_allowed",
1449 .data
= &sysctl_compact_unevictable_allowed
,
1450 .maxlen
= sizeof(int),
1452 .proc_handler
= proc_dointvec
,
1457 #endif /* CONFIG_COMPACTION */
1459 .procname
= "min_free_kbytes",
1460 .data
= &min_free_kbytes
,
1461 .maxlen
= sizeof(min_free_kbytes
),
1463 .proc_handler
= min_free_kbytes_sysctl_handler
,
1467 .procname
= "watermark_scale_factor",
1468 .data
= &watermark_scale_factor
,
1469 .maxlen
= sizeof(watermark_scale_factor
),
1471 .proc_handler
= watermark_scale_factor_sysctl_handler
,
1473 .extra2
= &one_thousand
,
1476 .procname
= "percpu_pagelist_fraction",
1477 .data
= &percpu_pagelist_fraction
,
1478 .maxlen
= sizeof(percpu_pagelist_fraction
),
1480 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1485 .procname
= "max_map_count",
1486 .data
= &sysctl_max_map_count
,
1487 .maxlen
= sizeof(sysctl_max_map_count
),
1489 .proc_handler
= proc_dointvec_minmax
,
1494 .procname
= "nr_trim_pages",
1495 .data
= &sysctl_nr_trim_pages
,
1496 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1498 .proc_handler
= proc_dointvec_minmax
,
1503 .procname
= "laptop_mode",
1504 .data
= &laptop_mode
,
1505 .maxlen
= sizeof(laptop_mode
),
1507 .proc_handler
= proc_dointvec_jiffies
,
1510 .procname
= "block_dump",
1511 .data
= &block_dump
,
1512 .maxlen
= sizeof(block_dump
),
1514 .proc_handler
= proc_dointvec
,
1518 .procname
= "vfs_cache_pressure",
1519 .data
= &sysctl_vfs_cache_pressure
,
1520 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1522 .proc_handler
= proc_dointvec
,
1525 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1527 .procname
= "legacy_va_layout",
1528 .data
= &sysctl_legacy_va_layout
,
1529 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1531 .proc_handler
= proc_dointvec
,
1537 .procname
= "zone_reclaim_mode",
1538 .data
= &node_reclaim_mode
,
1539 .maxlen
= sizeof(node_reclaim_mode
),
1541 .proc_handler
= proc_dointvec
,
1545 .procname
= "min_unmapped_ratio",
1546 .data
= &sysctl_min_unmapped_ratio
,
1547 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1549 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1551 .extra2
= &one_hundred
,
1554 .procname
= "min_slab_ratio",
1555 .data
= &sysctl_min_slab_ratio
,
1556 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1558 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1560 .extra2
= &one_hundred
,
1565 .procname
= "stat_interval",
1566 .data
= &sysctl_stat_interval
,
1567 .maxlen
= sizeof(sysctl_stat_interval
),
1569 .proc_handler
= proc_dointvec_jiffies
,
1572 .procname
= "stat_refresh",
1576 .proc_handler
= vmstat_refresh
,
1581 .procname
= "mmap_min_addr",
1582 .data
= &dac_mmap_min_addr
,
1583 .maxlen
= sizeof(unsigned long),
1585 .proc_handler
= mmap_min_addr_handler
,
1590 .procname
= "numa_zonelist_order",
1591 .data
= &numa_zonelist_order
,
1592 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1594 .proc_handler
= numa_zonelist_order_handler
,
1597 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1598 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1600 .procname
= "vdso_enabled",
1601 #ifdef CONFIG_X86_32
1602 .data
= &vdso32_enabled
,
1603 .maxlen
= sizeof(vdso32_enabled
),
1605 .data
= &vdso_enabled
,
1606 .maxlen
= sizeof(vdso_enabled
),
1609 .proc_handler
= proc_dointvec
,
1613 #ifdef CONFIG_HIGHMEM
1615 .procname
= "highmem_is_dirtyable",
1616 .data
= &vm_highmem_is_dirtyable
,
1617 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1619 .proc_handler
= proc_dointvec_minmax
,
1624 #ifdef CONFIG_MEMORY_FAILURE
1626 .procname
= "memory_failure_early_kill",
1627 .data
= &sysctl_memory_failure_early_kill
,
1628 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1630 .proc_handler
= proc_dointvec_minmax
,
1635 .procname
= "memory_failure_recovery",
1636 .data
= &sysctl_memory_failure_recovery
,
1637 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1639 .proc_handler
= proc_dointvec_minmax
,
1645 .procname
= "user_reserve_kbytes",
1646 .data
= &sysctl_user_reserve_kbytes
,
1647 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1649 .proc_handler
= proc_doulongvec_minmax
,
1652 .procname
= "admin_reserve_kbytes",
1653 .data
= &sysctl_admin_reserve_kbytes
,
1654 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1656 .proc_handler
= proc_doulongvec_minmax
,
1658 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1660 .procname
= "mmap_rnd_bits",
1661 .data
= &mmap_rnd_bits
,
1662 .maxlen
= sizeof(mmap_rnd_bits
),
1664 .proc_handler
= proc_dointvec_minmax
,
1665 .extra1
= (void *)&mmap_rnd_bits_min
,
1666 .extra2
= (void *)&mmap_rnd_bits_max
,
1669 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1671 .procname
= "mmap_rnd_compat_bits",
1672 .data
= &mmap_rnd_compat_bits
,
1673 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1675 .proc_handler
= proc_dointvec_minmax
,
1676 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1677 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1683 static struct ctl_table fs_table
[] = {
1685 .procname
= "inode-nr",
1686 .data
= &inodes_stat
,
1687 .maxlen
= 2*sizeof(long),
1689 .proc_handler
= proc_nr_inodes
,
1692 .procname
= "inode-state",
1693 .data
= &inodes_stat
,
1694 .maxlen
= 7*sizeof(long),
1696 .proc_handler
= proc_nr_inodes
,
1699 .procname
= "file-nr",
1700 .data
= &files_stat
,
1701 .maxlen
= sizeof(files_stat
),
1703 .proc_handler
= proc_nr_files
,
1706 .procname
= "file-max",
1707 .data
= &files_stat
.max_files
,
1708 .maxlen
= sizeof(files_stat
.max_files
),
1710 .proc_handler
= proc_doulongvec_minmax
,
1713 .procname
= "nr_open",
1714 .data
= &sysctl_nr_open
,
1715 .maxlen
= sizeof(unsigned int),
1717 .proc_handler
= proc_dointvec_minmax
,
1718 .extra1
= &sysctl_nr_open_min
,
1719 .extra2
= &sysctl_nr_open_max
,
1722 .procname
= "dentry-state",
1723 .data
= &dentry_stat
,
1724 .maxlen
= 6*sizeof(long),
1726 .proc_handler
= proc_nr_dentry
,
1729 .procname
= "overflowuid",
1730 .data
= &fs_overflowuid
,
1731 .maxlen
= sizeof(int),
1733 .proc_handler
= proc_dointvec_minmax
,
1734 .extra1
= &minolduid
,
1735 .extra2
= &maxolduid
,
1738 .procname
= "overflowgid",
1739 .data
= &fs_overflowgid
,
1740 .maxlen
= sizeof(int),
1742 .proc_handler
= proc_dointvec_minmax
,
1743 .extra1
= &minolduid
,
1744 .extra2
= &maxolduid
,
1746 #ifdef CONFIG_FILE_LOCKING
1748 .procname
= "leases-enable",
1749 .data
= &leases_enable
,
1750 .maxlen
= sizeof(int),
1752 .proc_handler
= proc_dointvec
,
1755 #ifdef CONFIG_DNOTIFY
1757 .procname
= "dir-notify-enable",
1758 .data
= &dir_notify_enable
,
1759 .maxlen
= sizeof(int),
1761 .proc_handler
= proc_dointvec
,
1765 #ifdef CONFIG_FILE_LOCKING
1767 .procname
= "lease-break-time",
1768 .data
= &lease_break_time
,
1769 .maxlen
= sizeof(int),
1771 .proc_handler
= proc_dointvec
,
1776 .procname
= "aio-nr",
1778 .maxlen
= sizeof(aio_nr
),
1780 .proc_handler
= proc_doulongvec_minmax
,
1783 .procname
= "aio-max-nr",
1784 .data
= &aio_max_nr
,
1785 .maxlen
= sizeof(aio_max_nr
),
1787 .proc_handler
= proc_doulongvec_minmax
,
1789 #endif /* CONFIG_AIO */
1790 #ifdef CONFIG_INOTIFY_USER
1792 .procname
= "inotify",
1794 .child
= inotify_table
,
1799 .procname
= "epoll",
1801 .child
= epoll_table
,
1806 .procname
= "protected_symlinks",
1807 .data
= &sysctl_protected_symlinks
,
1808 .maxlen
= sizeof(int),
1810 .proc_handler
= proc_dointvec_minmax
,
1815 .procname
= "protected_hardlinks",
1816 .data
= &sysctl_protected_hardlinks
,
1817 .maxlen
= sizeof(int),
1819 .proc_handler
= proc_dointvec_minmax
,
1824 .procname
= "suid_dumpable",
1825 .data
= &suid_dumpable
,
1826 .maxlen
= sizeof(int),
1828 .proc_handler
= proc_dointvec_minmax_coredump
,
1832 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1834 .procname
= "binfmt_misc",
1836 .child
= sysctl_mount_point
,
1840 .procname
= "pipe-max-size",
1841 .data
= &pipe_max_size
,
1842 .maxlen
= sizeof(int),
1844 .proc_handler
= &pipe_proc_fn
,
1845 .extra1
= &pipe_min_size
,
1848 .procname
= "pipe-user-pages-hard",
1849 .data
= &pipe_user_pages_hard
,
1850 .maxlen
= sizeof(pipe_user_pages_hard
),
1852 .proc_handler
= proc_doulongvec_minmax
,
1855 .procname
= "pipe-user-pages-soft",
1856 .data
= &pipe_user_pages_soft
,
1857 .maxlen
= sizeof(pipe_user_pages_soft
),
1859 .proc_handler
= proc_doulongvec_minmax
,
1862 .procname
= "mount-max",
1863 .data
= &sysctl_mount_max
,
1864 .maxlen
= sizeof(unsigned int),
1866 .proc_handler
= proc_dointvec_minmax
,
1872 static struct ctl_table debug_table
[] = {
1873 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1875 .procname
= "exception-trace",
1876 .data
= &show_unhandled_signals
,
1877 .maxlen
= sizeof(int),
1879 .proc_handler
= proc_dointvec
1882 #if defined(CONFIG_OPTPROBES)
1884 .procname
= "kprobes-optimization",
1885 .data
= &sysctl_kprobes_optimization
,
1886 .maxlen
= sizeof(int),
1888 .proc_handler
= proc_kprobes_optimization_handler
,
1896 static struct ctl_table dev_table
[] = {
1900 int __init
sysctl_init(void)
1902 struct ctl_table_header
*hdr
;
1904 hdr
= register_sysctl_table(sysctl_base_table
);
1905 kmemleak_not_leak(hdr
);
1909 #endif /* CONFIG_SYSCTL */
1915 #ifdef CONFIG_PROC_SYSCTL
1917 static int _proc_do_string(char *data
, int maxlen
, int write
,
1918 char __user
*buffer
,
1919 size_t *lenp
, loff_t
*ppos
)
1925 if (!data
|| !maxlen
|| !*lenp
) {
1931 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1932 /* Only continue writes not past the end of buffer. */
1934 if (len
> maxlen
- 1)
1941 /* Start writing from beginning of buffer. */
1947 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1948 if (get_user(c
, p
++))
1950 if (c
== 0 || c
== '\n')
1971 if (copy_to_user(buffer
, data
, len
))
1974 if (put_user('\n', buffer
+ len
))
1984 static void warn_sysctl_write(struct ctl_table
*table
)
1986 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1987 "This will not be supported in the future. To silence this\n"
1988 "warning, set kernel.sysctl_writes_strict = -1\n",
1989 current
->comm
, table
->procname
);
1993 * proc_dostring - read a string sysctl
1994 * @table: the sysctl table
1995 * @write: %TRUE if this is a write to the sysctl file
1996 * @buffer: the user buffer
1997 * @lenp: the size of the user buffer
1998 * @ppos: file position
2000 * Reads/writes a string from/to the user buffer. If the kernel
2001 * buffer provided is not large enough to hold the string, the
2002 * string is truncated. The copied string is %NULL-terminated.
2003 * If the string is being read by the user process, it is copied
2004 * and a newline '\n' is added. It is truncated if the buffer is
2007 * Returns 0 on success.
2009 int proc_dostring(struct ctl_table
*table
, int write
,
2010 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2012 if (write
&& *ppos
&& sysctl_writes_strict
== SYSCTL_WRITES_WARN
)
2013 warn_sysctl_write(table
);
2015 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2016 (char __user
*)buffer
, lenp
, ppos
);
2019 static size_t proc_skip_spaces(char **buf
)
2022 char *tmp
= skip_spaces(*buf
);
2028 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2038 #define TMPBUFLEN 22
2040 * proc_get_long - reads an ASCII formatted integer from a user buffer
2042 * @buf: a kernel buffer
2043 * @size: size of the kernel buffer
2044 * @val: this is where the number will be stored
2045 * @neg: set to %TRUE if number is negative
2046 * @perm_tr: a vector which contains the allowed trailers
2047 * @perm_tr_len: size of the perm_tr vector
2048 * @tr: pointer to store the trailer character
2050 * In case of success %0 is returned and @buf and @size are updated with
2051 * the amount of bytes read. If @tr is non-NULL and a trailing
2052 * character exists (size is non-zero after returning from this
2053 * function), @tr is updated with the trailing character.
2055 static int proc_get_long(char **buf
, size_t *size
,
2056 unsigned long *val
, bool *neg
,
2057 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2060 char *p
, tmp
[TMPBUFLEN
];
2066 if (len
> TMPBUFLEN
- 1)
2067 len
= TMPBUFLEN
- 1;
2069 memcpy(tmp
, *buf
, len
);
2073 if (*p
== '-' && *size
> 1) {
2081 *val
= simple_strtoul(p
, &p
, 0);
2085 /* We don't know if the next char is whitespace thus we may accept
2086 * invalid integers (e.g. 1234...a) or two integers instead of one
2087 * (e.g. 123...1). So lets not allow such large numbers. */
2088 if (len
== TMPBUFLEN
- 1)
2091 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2094 if (tr
&& (len
< *size
))
2104 * proc_put_long - converts an integer to a decimal ASCII formatted string
2106 * @buf: the user buffer
2107 * @size: the size of the user buffer
2108 * @val: the integer to be converted
2109 * @neg: sign of the number, %TRUE for negative
2111 * In case of success %0 is returned and @buf and @size are updated with
2112 * the amount of bytes written.
2114 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2118 char tmp
[TMPBUFLEN
], *p
= tmp
;
2120 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2124 if (copy_to_user(*buf
, tmp
, len
))
2132 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2135 char __user
**buffer
= (char __user
**)buf
;
2136 if (put_user(c
, *buffer
))
2138 (*size
)--, (*buffer
)++;
2144 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2146 int write
, void *data
)
2150 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2154 if (*lvalp
> (unsigned long) INT_MAX
)
2162 *lvalp
= -(unsigned long)val
;
2165 *lvalp
= (unsigned long)val
;
2171 static int do_proc_douintvec_conv(bool *negp
, unsigned long *lvalp
,
2173 int write
, void *data
)
2180 unsigned int val
= *valp
;
2181 *lvalp
= (unsigned long)val
;
2186 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2188 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2189 int write
, void __user
*buffer
,
2190 size_t *lenp
, loff_t
*ppos
,
2191 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2192 int write
, void *data
),
2195 int *i
, vleft
, first
= 1, err
= 0;
2197 char *kbuf
= NULL
, *p
;
2199 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2204 i
= (int *) tbl_data
;
2205 vleft
= table
->maxlen
/ sizeof(*i
);
2209 conv
= do_proc_dointvec_conv
;
2213 switch (sysctl_writes_strict
) {
2214 case SYSCTL_WRITES_STRICT
:
2216 case SYSCTL_WRITES_WARN
:
2217 warn_sysctl_write(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
);
2290 * proc_dointvec - read a vector of integers
2291 * @table: the sysctl table
2292 * @write: %TRUE if this is a write to the sysctl file
2293 * @buffer: the user buffer
2294 * @lenp: the size of the user buffer
2295 * @ppos: file position
2297 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2298 * values from/to the user buffer, treated as an ASCII string.
2300 * Returns 0 on success.
2302 int proc_dointvec(struct ctl_table
*table
, int write
,
2303 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2305 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2309 * proc_douintvec - read a vector of unsigned integers
2310 * @table: the sysctl table
2311 * @write: %TRUE if this is a write to the sysctl file
2312 * @buffer: the user buffer
2313 * @lenp: the size of the user buffer
2314 * @ppos: file position
2316 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2317 * values from/to the user buffer, treated as an ASCII string.
2319 * Returns 0 on success.
2321 int proc_douintvec(struct ctl_table
*table
, int write
,
2322 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2324 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2325 do_proc_douintvec_conv
, NULL
);
2329 * Taint values can only be increased
2330 * This means we can safely use a temporary.
2332 static int proc_taint(struct ctl_table
*table
, int write
,
2333 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2336 unsigned long tmptaint
= get_taint();
2339 if (write
&& !capable(CAP_SYS_ADMIN
))
2344 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2350 * Poor man's atomic or. Not worth adding a primitive
2351 * to everyone's atomic.h for this
2354 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2355 if ((tmptaint
>> i
) & 1)
2356 add_taint(i
, LOCKDEP_STILL_OK
);
2363 #ifdef CONFIG_PRINTK
2364 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2365 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2367 if (write
&& !capable(CAP_SYS_ADMIN
))
2370 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2374 struct do_proc_dointvec_minmax_conv_param
{
2379 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2381 int write
, void *data
)
2383 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2385 int val
= *negp
? -*lvalp
: *lvalp
;
2386 if ((param
->min
&& *param
->min
> val
) ||
2387 (param
->max
&& *param
->max
< val
))
2394 *lvalp
= -(unsigned long)val
;
2397 *lvalp
= (unsigned long)val
;
2404 * proc_dointvec_minmax - read a vector of integers with min/max values
2405 * @table: the sysctl table
2406 * @write: %TRUE if this is a write to the sysctl file
2407 * @buffer: the user buffer
2408 * @lenp: the size of the user buffer
2409 * @ppos: file position
2411 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2412 * values from/to the user buffer, treated as an ASCII string.
2414 * This routine will ensure the values are within the range specified by
2415 * table->extra1 (min) and table->extra2 (max).
2417 * Returns 0 on success.
2419 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2420 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2422 struct do_proc_dointvec_minmax_conv_param param
= {
2423 .min
= (int *) table
->extra1
,
2424 .max
= (int *) table
->extra2
,
2426 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2427 do_proc_dointvec_minmax_conv
, ¶m
);
2430 static void validate_coredump_safety(void)
2432 #ifdef CONFIG_COREDUMP
2433 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2434 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2436 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2437 "Pipe handler or fully qualified core dump path required.\n"
2438 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2444 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2445 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2447 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2449 validate_coredump_safety();
2453 #ifdef CONFIG_COREDUMP
2454 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2455 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2457 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2459 validate_coredump_safety();
2464 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2465 void __user
*buffer
,
2466 size_t *lenp
, loff_t
*ppos
,
2467 unsigned long convmul
,
2468 unsigned long convdiv
)
2470 unsigned long *i
, *min
, *max
;
2471 int vleft
, first
= 1, err
= 0;
2473 char *kbuf
= NULL
, *p
;
2475 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2480 i
= (unsigned long *) data
;
2481 min
= (unsigned long *) table
->extra1
;
2482 max
= (unsigned long *) table
->extra2
;
2483 vleft
= table
->maxlen
/ sizeof(unsigned long);
2488 switch (sysctl_writes_strict
) {
2489 case SYSCTL_WRITES_STRICT
:
2491 case SYSCTL_WRITES_WARN
:
2492 warn_sysctl_write(table
);
2499 if (left
> PAGE_SIZE
- 1)
2500 left
= PAGE_SIZE
- 1;
2501 p
= kbuf
= memdup_user_nul(buffer
, left
);
2503 return PTR_ERR(kbuf
);
2506 for (; left
&& vleft
--; i
++, first
= 0) {
2512 left
-= proc_skip_spaces(&p
);
2514 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2516 sizeof(proc_wspace_sep
), NULL
);
2521 val
= convmul
* val
/ convdiv
;
2522 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2526 val
= convdiv
* (*i
) / convmul
;
2528 err
= proc_put_char(&buffer
, &left
, '\t');
2532 err
= proc_put_long(&buffer
, &left
, val
, false);
2538 if (!write
&& !first
&& left
&& !err
)
2539 err
= proc_put_char(&buffer
, &left
, '\n');
2541 left
-= proc_skip_spaces(&p
);
2545 return err
? : -EINVAL
;
2553 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2554 void __user
*buffer
,
2555 size_t *lenp
, loff_t
*ppos
,
2556 unsigned long convmul
,
2557 unsigned long convdiv
)
2559 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2560 buffer
, lenp
, ppos
, convmul
, convdiv
);
2564 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2565 * @table: the sysctl table
2566 * @write: %TRUE if this is a write to the sysctl file
2567 * @buffer: the user buffer
2568 * @lenp: the size of the user buffer
2569 * @ppos: file position
2571 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2572 * values from/to the user buffer, treated as an ASCII string.
2574 * This routine will ensure the values are within the range specified by
2575 * table->extra1 (min) and table->extra2 (max).
2577 * Returns 0 on success.
2579 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2580 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2582 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2586 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2587 * @table: the sysctl table
2588 * @write: %TRUE if this is a write to the sysctl file
2589 * @buffer: the user buffer
2590 * @lenp: the size of the user buffer
2591 * @ppos: file position
2593 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2594 * values from/to the user buffer, treated as an ASCII string. The values
2595 * are treated as milliseconds, and converted to jiffies when they are stored.
2597 * This routine will ensure the values are within the range specified by
2598 * table->extra1 (min) and table->extra2 (max).
2600 * Returns 0 on success.
2602 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2603 void __user
*buffer
,
2604 size_t *lenp
, loff_t
*ppos
)
2606 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2607 lenp
, ppos
, HZ
, 1000l);
2611 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2613 int write
, void *data
)
2616 if (*lvalp
> LONG_MAX
/ HZ
)
2618 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2624 lval
= -(unsigned long)val
;
2627 lval
= (unsigned long)val
;
2634 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2636 int write
, void *data
)
2639 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2641 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2647 lval
= -(unsigned long)val
;
2650 lval
= (unsigned long)val
;
2652 *lvalp
= jiffies_to_clock_t(lval
);
2657 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2659 int write
, void *data
)
2662 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2672 lval
= -(unsigned long)val
;
2675 lval
= (unsigned long)val
;
2677 *lvalp
= jiffies_to_msecs(lval
);
2683 * proc_dointvec_jiffies - read a vector of integers as seconds
2684 * @table: the sysctl table
2685 * @write: %TRUE if this is a write to the sysctl file
2686 * @buffer: the user buffer
2687 * @lenp: the size of the user buffer
2688 * @ppos: file position
2690 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2691 * values from/to the user buffer, treated as an ASCII string.
2692 * The values read are assumed to be in seconds, and are converted into
2695 * Returns 0 on success.
2697 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2698 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2700 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2701 do_proc_dointvec_jiffies_conv
,NULL
);
2705 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2706 * @table: the sysctl table
2707 * @write: %TRUE if this is a write to the sysctl file
2708 * @buffer: the user buffer
2709 * @lenp: the size of the user buffer
2710 * @ppos: pointer to the file position
2712 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2713 * values from/to the user buffer, treated as an ASCII string.
2714 * The values read are assumed to be in 1/USER_HZ seconds, and
2715 * are converted into jiffies.
2717 * Returns 0 on success.
2719 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2720 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2722 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2723 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2727 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2728 * @table: the sysctl table
2729 * @write: %TRUE if this is a write to the sysctl file
2730 * @buffer: the user buffer
2731 * @lenp: the size of the user buffer
2732 * @ppos: file position
2733 * @ppos: the current position in the file
2735 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2736 * values from/to the user buffer, treated as an ASCII string.
2737 * The values read are assumed to be in 1/1000 seconds, and
2738 * are converted into jiffies.
2740 * Returns 0 on success.
2742 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2743 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2745 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2746 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2749 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2750 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2752 struct pid
*new_pid
;
2756 tmp
= pid_vnr(cad_pid
);
2758 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2759 lenp
, ppos
, NULL
, NULL
);
2763 new_pid
= find_get_pid(tmp
);
2767 put_pid(xchg(&cad_pid
, new_pid
));
2772 * proc_do_large_bitmap - read/write from/to a large bitmap
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 * The bitmap is stored at table->data and the bitmap length (in bits)
2782 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2783 * large bitmaps may be represented in a compact manner. Writing into
2784 * the file will clear the bitmap then update it with the given input.
2786 * Returns 0 on success.
2788 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2789 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2793 size_t left
= *lenp
;
2794 unsigned long bitmap_len
= table
->maxlen
;
2795 unsigned long *bitmap
= *(unsigned long **) table
->data
;
2796 unsigned long *tmp_bitmap
= NULL
;
2797 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2799 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2807 if (left
> PAGE_SIZE
- 1)
2808 left
= PAGE_SIZE
- 1;
2810 p
= kbuf
= memdup_user_nul(buffer
, left
);
2812 return PTR_ERR(kbuf
);
2814 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2820 proc_skip_char(&p
, &left
, '\n');
2821 while (!err
&& left
) {
2822 unsigned long val_a
, val_b
;
2825 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
2829 if (val_a
>= bitmap_len
|| neg
) {
2841 err
= proc_get_long(&p
, &left
, &val_b
,
2842 &neg
, tr_b
, sizeof(tr_b
),
2846 if (val_b
>= bitmap_len
|| neg
||
2857 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2859 proc_skip_char(&p
, &left
, '\n');
2863 unsigned long bit_a
, bit_b
= 0;
2866 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2867 if (bit_a
>= bitmap_len
)
2869 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2873 err
= proc_put_char(&buffer
, &left
, ',');
2877 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2880 if (bit_a
!= bit_b
) {
2881 err
= proc_put_char(&buffer
, &left
, '-');
2884 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2892 err
= proc_put_char(&buffer
, &left
, '\n');
2898 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2900 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
2912 #else /* CONFIG_PROC_SYSCTL */
2914 int proc_dostring(struct ctl_table
*table
, int write
,
2915 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2920 int proc_dointvec(struct ctl_table
*table
, int write
,
2921 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2926 int proc_douintvec(struct ctl_table
*table
, int write
,
2927 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2932 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2933 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2938 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2939 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2944 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2945 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2950 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2951 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2956 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2957 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2962 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2963 void __user
*buffer
,
2964 size_t *lenp
, loff_t
*ppos
)
2970 #endif /* CONFIG_PROC_SYSCTL */
2973 * No sense putting this after each symbol definition, twice,
2974 * exception granted :-)
2976 EXPORT_SYMBOL(proc_dointvec
);
2977 EXPORT_SYMBOL(proc_douintvec
);
2978 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2979 EXPORT_SYMBOL(proc_dointvec_minmax
);
2980 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2981 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2982 EXPORT_SYMBOL(proc_dostring
);
2983 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2984 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);