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/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/sched/coredump.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69 #include <linux/pipe_fs_i.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
);
221 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
222 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
224 #ifdef CONFIG_MAGIC_SYSRQ
225 /* Note: sysrq code uses it's own private copy */
226 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
228 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
229 void __user
*buffer
, size_t *lenp
,
234 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
239 sysrq_toggle_support(__sysrq_enabled
);
246 static struct ctl_table kern_table
[];
247 static struct ctl_table vm_table
[];
248 static struct ctl_table fs_table
[];
249 static struct ctl_table debug_table
[];
250 static struct ctl_table dev_table
[];
251 extern struct ctl_table random_table
[];
253 extern struct ctl_table epoll_table
[];
256 #ifdef CONFIG_FW_LOADER_USER_HELPER
257 extern struct ctl_table firmware_config_table
[];
260 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
261 int sysctl_legacy_va_layout
;
264 /* The default sysctl tables: */
266 static struct ctl_table sysctl_base_table
[] = {
268 .procname
= "kernel",
285 .child
= debug_table
,
295 #ifdef CONFIG_SCHED_DEBUG
296 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
297 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
298 static int min_wakeup_granularity_ns
; /* 0 usecs */
299 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
301 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
302 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
303 #endif /* CONFIG_SMP */
304 #endif /* CONFIG_SCHED_DEBUG */
306 #ifdef CONFIG_COMPACTION
307 static int min_extfrag_threshold
;
308 static int max_extfrag_threshold
= 1000;
311 static struct ctl_table kern_table
[] = {
313 .procname
= "sched_child_runs_first",
314 .data
= &sysctl_sched_child_runs_first
,
315 .maxlen
= sizeof(unsigned int),
317 .proc_handler
= proc_dointvec
,
319 #ifdef CONFIG_SCHED_DEBUG
321 .procname
= "sched_min_granularity_ns",
322 .data
= &sysctl_sched_min_granularity
,
323 .maxlen
= sizeof(unsigned int),
325 .proc_handler
= sched_proc_update_handler
,
326 .extra1
= &min_sched_granularity_ns
,
327 .extra2
= &max_sched_granularity_ns
,
330 .procname
= "sched_latency_ns",
331 .data
= &sysctl_sched_latency
,
332 .maxlen
= sizeof(unsigned int),
334 .proc_handler
= sched_proc_update_handler
,
335 .extra1
= &min_sched_granularity_ns
,
336 .extra2
= &max_sched_granularity_ns
,
339 .procname
= "sched_wakeup_granularity_ns",
340 .data
= &sysctl_sched_wakeup_granularity
,
341 .maxlen
= sizeof(unsigned int),
343 .proc_handler
= sched_proc_update_handler
,
344 .extra1
= &min_wakeup_granularity_ns
,
345 .extra2
= &max_wakeup_granularity_ns
,
349 .procname
= "sched_tunable_scaling",
350 .data
= &sysctl_sched_tunable_scaling
,
351 .maxlen
= sizeof(enum sched_tunable_scaling
),
353 .proc_handler
= sched_proc_update_handler
,
354 .extra1
= &min_sched_tunable_scaling
,
355 .extra2
= &max_sched_tunable_scaling
,
358 .procname
= "sched_migration_cost_ns",
359 .data
= &sysctl_sched_migration_cost
,
360 .maxlen
= sizeof(unsigned int),
362 .proc_handler
= proc_dointvec
,
365 .procname
= "sched_nr_migrate",
366 .data
= &sysctl_sched_nr_migrate
,
367 .maxlen
= sizeof(unsigned int),
369 .proc_handler
= proc_dointvec
,
371 #ifdef CONFIG_SCHEDSTATS
373 .procname
= "sched_schedstats",
375 .maxlen
= sizeof(unsigned int),
377 .proc_handler
= sysctl_schedstats
,
381 #endif /* CONFIG_SCHEDSTATS */
382 #endif /* CONFIG_SMP */
383 #ifdef CONFIG_NUMA_BALANCING
385 .procname
= "numa_balancing_scan_delay_ms",
386 .data
= &sysctl_numa_balancing_scan_delay
,
387 .maxlen
= sizeof(unsigned int),
389 .proc_handler
= proc_dointvec
,
392 .procname
= "numa_balancing_scan_period_min_ms",
393 .data
= &sysctl_numa_balancing_scan_period_min
,
394 .maxlen
= sizeof(unsigned int),
396 .proc_handler
= proc_dointvec
,
399 .procname
= "numa_balancing_scan_period_max_ms",
400 .data
= &sysctl_numa_balancing_scan_period_max
,
401 .maxlen
= sizeof(unsigned int),
403 .proc_handler
= proc_dointvec
,
406 .procname
= "numa_balancing_scan_size_mb",
407 .data
= &sysctl_numa_balancing_scan_size
,
408 .maxlen
= sizeof(unsigned int),
410 .proc_handler
= proc_dointvec_minmax
,
414 .procname
= "numa_balancing",
415 .data
= NULL
, /* filled in by handler */
416 .maxlen
= sizeof(unsigned int),
418 .proc_handler
= sysctl_numa_balancing
,
422 #endif /* CONFIG_NUMA_BALANCING */
423 #endif /* CONFIG_SCHED_DEBUG */
425 .procname
= "sched_rt_period_us",
426 .data
= &sysctl_sched_rt_period
,
427 .maxlen
= sizeof(unsigned int),
429 .proc_handler
= sched_rt_handler
,
432 .procname
= "sched_rt_runtime_us",
433 .data
= &sysctl_sched_rt_runtime
,
434 .maxlen
= sizeof(int),
436 .proc_handler
= sched_rt_handler
,
439 .procname
= "sched_rr_timeslice_ms",
440 .data
= &sysctl_sched_rr_timeslice
,
441 .maxlen
= sizeof(int),
443 .proc_handler
= sched_rr_handler
,
445 #ifdef CONFIG_SCHED_AUTOGROUP
447 .procname
= "sched_autogroup_enabled",
448 .data
= &sysctl_sched_autogroup_enabled
,
449 .maxlen
= sizeof(unsigned int),
451 .proc_handler
= proc_dointvec_minmax
,
456 #ifdef CONFIG_CFS_BANDWIDTH
458 .procname
= "sched_cfs_bandwidth_slice_us",
459 .data
= &sysctl_sched_cfs_bandwidth_slice
,
460 .maxlen
= sizeof(unsigned int),
462 .proc_handler
= proc_dointvec_minmax
,
466 #ifdef CONFIG_PROVE_LOCKING
468 .procname
= "prove_locking",
469 .data
= &prove_locking
,
470 .maxlen
= sizeof(int),
472 .proc_handler
= proc_dointvec
,
475 #ifdef CONFIG_LOCK_STAT
477 .procname
= "lock_stat",
479 .maxlen
= sizeof(int),
481 .proc_handler
= proc_dointvec
,
486 .data
= &panic_timeout
,
487 .maxlen
= sizeof(int),
489 .proc_handler
= proc_dointvec
,
491 #ifdef CONFIG_COREDUMP
493 .procname
= "core_uses_pid",
494 .data
= &core_uses_pid
,
495 .maxlen
= sizeof(int),
497 .proc_handler
= proc_dointvec
,
500 .procname
= "core_pattern",
501 .data
= core_pattern
,
502 .maxlen
= CORENAME_MAX_SIZE
,
504 .proc_handler
= proc_dostring_coredump
,
507 .procname
= "core_pipe_limit",
508 .data
= &core_pipe_limit
,
509 .maxlen
= sizeof(unsigned int),
511 .proc_handler
= proc_dointvec
,
514 #ifdef CONFIG_PROC_SYSCTL
516 .procname
= "tainted",
517 .maxlen
= sizeof(long),
519 .proc_handler
= proc_taint
,
522 .procname
= "sysctl_writes_strict",
523 .data
= &sysctl_writes_strict
,
524 .maxlen
= sizeof(int),
526 .proc_handler
= proc_dointvec_minmax
,
531 #ifdef CONFIG_LATENCYTOP
533 .procname
= "latencytop",
534 .data
= &latencytop_enabled
,
535 .maxlen
= sizeof(int),
537 .proc_handler
= sysctl_latencytop
,
540 #ifdef CONFIG_BLK_DEV_INITRD
542 .procname
= "real-root-dev",
543 .data
= &real_root_dev
,
544 .maxlen
= sizeof(int),
546 .proc_handler
= proc_dointvec
,
550 .procname
= "print-fatal-signals",
551 .data
= &print_fatal_signals
,
552 .maxlen
= sizeof(int),
554 .proc_handler
= proc_dointvec
,
558 .procname
= "reboot-cmd",
559 .data
= reboot_command
,
562 .proc_handler
= proc_dostring
,
565 .procname
= "stop-a",
566 .data
= &stop_a_enabled
,
567 .maxlen
= sizeof (int),
569 .proc_handler
= proc_dointvec
,
572 .procname
= "scons-poweroff",
573 .data
= &scons_pwroff
,
574 .maxlen
= sizeof (int),
576 .proc_handler
= proc_dointvec
,
579 #ifdef CONFIG_SPARC64
581 .procname
= "tsb-ratio",
582 .data
= &sysctl_tsb_ratio
,
583 .maxlen
= sizeof (int),
585 .proc_handler
= proc_dointvec
,
590 .procname
= "soft-power",
591 .data
= &pwrsw_enabled
,
592 .maxlen
= sizeof (int),
594 .proc_handler
= proc_dointvec
,
597 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
599 .procname
= "unaligned-trap",
600 .data
= &unaligned_enabled
,
601 .maxlen
= sizeof (int),
603 .proc_handler
= proc_dointvec
,
607 .procname
= "ctrl-alt-del",
609 .maxlen
= sizeof(int),
611 .proc_handler
= proc_dointvec
,
613 #ifdef CONFIG_FUNCTION_TRACER
615 .procname
= "ftrace_enabled",
616 .data
= &ftrace_enabled
,
617 .maxlen
= sizeof(int),
619 .proc_handler
= ftrace_enable_sysctl
,
622 #ifdef CONFIG_STACK_TRACER
624 .procname
= "stack_tracer_enabled",
625 .data
= &stack_tracer_enabled
,
626 .maxlen
= sizeof(int),
628 .proc_handler
= stack_trace_sysctl
,
631 #ifdef CONFIG_TRACING
633 .procname
= "ftrace_dump_on_oops",
634 .data
= &ftrace_dump_on_oops
,
635 .maxlen
= sizeof(int),
637 .proc_handler
= proc_dointvec
,
640 .procname
= "traceoff_on_warning",
641 .data
= &__disable_trace_on_warning
,
642 .maxlen
= sizeof(__disable_trace_on_warning
),
644 .proc_handler
= proc_dointvec
,
647 .procname
= "tracepoint_printk",
648 .data
= &tracepoint_printk
,
649 .maxlen
= sizeof(tracepoint_printk
),
651 .proc_handler
= tracepoint_printk_sysctl
,
654 #ifdef CONFIG_KEXEC_CORE
656 .procname
= "kexec_load_disabled",
657 .data
= &kexec_load_disabled
,
658 .maxlen
= sizeof(int),
660 /* only handle a transition from default "0" to "1" */
661 .proc_handler
= proc_dointvec_minmax
,
666 #ifdef CONFIG_MODULES
668 .procname
= "modprobe",
669 .data
= &modprobe_path
,
670 .maxlen
= KMOD_PATH_LEN
,
672 .proc_handler
= proc_dostring
,
675 .procname
= "modules_disabled",
676 .data
= &modules_disabled
,
677 .maxlen
= sizeof(int),
679 /* only handle a transition from default "0" to "1" */
680 .proc_handler
= proc_dointvec_minmax
,
685 #ifdef CONFIG_UEVENT_HELPER
687 .procname
= "hotplug",
688 .data
= &uevent_helper
,
689 .maxlen
= UEVENT_HELPER_PATH_LEN
,
691 .proc_handler
= proc_dostring
,
694 #ifdef CONFIG_CHR_DEV_SG
696 .procname
= "sg-big-buff",
697 .data
= &sg_big_buff
,
698 .maxlen
= sizeof (int),
700 .proc_handler
= proc_dointvec
,
703 #ifdef CONFIG_BSD_PROCESS_ACCT
707 .maxlen
= 3*sizeof(int),
709 .proc_handler
= proc_dointvec
,
712 #ifdef CONFIG_MAGIC_SYSRQ
715 .data
= &__sysrq_enabled
,
716 .maxlen
= sizeof (int),
718 .proc_handler
= sysrq_sysctl_handler
,
721 #ifdef CONFIG_PROC_SYSCTL
723 .procname
= "cad_pid",
725 .maxlen
= sizeof (int),
727 .proc_handler
= proc_do_cad_pid
,
731 .procname
= "threads-max",
733 .maxlen
= sizeof(int),
735 .proc_handler
= sysctl_max_threads
,
738 .procname
= "random",
740 .child
= random_table
,
743 .procname
= "usermodehelper",
745 .child
= usermodehelper_table
,
747 #ifdef CONFIG_FW_LOADER_USER_HELPER
749 .procname
= "firmware_config",
751 .child
= firmware_config_table
,
755 .procname
= "overflowuid",
756 .data
= &overflowuid
,
757 .maxlen
= sizeof(int),
759 .proc_handler
= proc_dointvec_minmax
,
760 .extra1
= &minolduid
,
761 .extra2
= &maxolduid
,
764 .procname
= "overflowgid",
765 .data
= &overflowgid
,
766 .maxlen
= sizeof(int),
768 .proc_handler
= proc_dointvec_minmax
,
769 .extra1
= &minolduid
,
770 .extra2
= &maxolduid
,
773 #ifdef CONFIG_MATHEMU
775 .procname
= "ieee_emulation_warnings",
776 .data
= &sysctl_ieee_emulation_warnings
,
777 .maxlen
= sizeof(int),
779 .proc_handler
= proc_dointvec
,
783 .procname
= "userprocess_debug",
784 .data
= &show_unhandled_signals
,
785 .maxlen
= sizeof(int),
787 .proc_handler
= proc_dointvec
,
791 .procname
= "pid_max",
793 .maxlen
= sizeof (int),
795 .proc_handler
= proc_dointvec_minmax
,
796 .extra1
= &pid_max_min
,
797 .extra2
= &pid_max_max
,
800 .procname
= "panic_on_oops",
801 .data
= &panic_on_oops
,
802 .maxlen
= sizeof(int),
804 .proc_handler
= proc_dointvec
,
806 #if defined CONFIG_PRINTK
808 .procname
= "printk",
809 .data
= &console_loglevel
,
810 .maxlen
= 4*sizeof(int),
812 .proc_handler
= proc_dointvec
,
815 .procname
= "printk_ratelimit",
816 .data
= &printk_ratelimit_state
.interval
,
817 .maxlen
= sizeof(int),
819 .proc_handler
= proc_dointvec_jiffies
,
822 .procname
= "printk_ratelimit_burst",
823 .data
= &printk_ratelimit_state
.burst
,
824 .maxlen
= sizeof(int),
826 .proc_handler
= proc_dointvec
,
829 .procname
= "printk_delay",
830 .data
= &printk_delay_msec
,
831 .maxlen
= sizeof(int),
833 .proc_handler
= proc_dointvec_minmax
,
835 .extra2
= &ten_thousand
,
838 .procname
= "printk_devkmsg",
839 .data
= devkmsg_log_str
,
840 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
842 .proc_handler
= devkmsg_sysctl_set_loglvl
,
845 .procname
= "dmesg_restrict",
846 .data
= &dmesg_restrict
,
847 .maxlen
= sizeof(int),
849 .proc_handler
= proc_dointvec_minmax_sysadmin
,
854 .procname
= "kptr_restrict",
855 .data
= &kptr_restrict
,
856 .maxlen
= sizeof(int),
858 .proc_handler
= proc_dointvec_minmax_sysadmin
,
864 .procname
= "ngroups_max",
865 .data
= &ngroups_max
,
866 .maxlen
= sizeof (int),
868 .proc_handler
= proc_dointvec
,
871 .procname
= "cap_last_cap",
872 .data
= (void *)&cap_last_cap
,
873 .maxlen
= sizeof(int),
875 .proc_handler
= proc_dointvec
,
877 #if defined(CONFIG_LOCKUP_DETECTOR)
879 .procname
= "watchdog",
880 .data
= &watchdog_user_enabled
,
881 .maxlen
= sizeof(int),
883 .proc_handler
= proc_watchdog
,
888 .procname
= "watchdog_thresh",
889 .data
= &watchdog_thresh
,
890 .maxlen
= sizeof(int),
892 .proc_handler
= proc_watchdog_thresh
,
897 .procname
= "nmi_watchdog",
898 .data
= &nmi_watchdog_user_enabled
,
899 .maxlen
= sizeof(int),
900 .mode
= NMI_WATCHDOG_SYSCTL_PERM
,
901 .proc_handler
= proc_nmi_watchdog
,
906 .procname
= "watchdog_cpumask",
907 .data
= &watchdog_cpumask_bits
,
910 .proc_handler
= proc_watchdog_cpumask
,
912 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
914 .procname
= "soft_watchdog",
915 .data
= &soft_watchdog_user_enabled
,
916 .maxlen
= sizeof(int),
918 .proc_handler
= proc_soft_watchdog
,
923 .procname
= "softlockup_panic",
924 .data
= &softlockup_panic
,
925 .maxlen
= sizeof(int),
927 .proc_handler
= proc_dointvec_minmax
,
933 .procname
= "softlockup_all_cpu_backtrace",
934 .data
= &sysctl_softlockup_all_cpu_backtrace
,
935 .maxlen
= sizeof(int),
937 .proc_handler
= proc_dointvec_minmax
,
941 #endif /* CONFIG_SMP */
943 #ifdef CONFIG_HARDLOCKUP_DETECTOR
945 .procname
= "hardlockup_panic",
946 .data
= &hardlockup_panic
,
947 .maxlen
= sizeof(int),
949 .proc_handler
= proc_dointvec_minmax
,
955 .procname
= "hardlockup_all_cpu_backtrace",
956 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
957 .maxlen
= sizeof(int),
959 .proc_handler
= proc_dointvec_minmax
,
963 #endif /* CONFIG_SMP */
967 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
969 .procname
= "unknown_nmi_panic",
970 .data
= &unknown_nmi_panic
,
971 .maxlen
= sizeof (int),
973 .proc_handler
= proc_dointvec
,
976 #if defined(CONFIG_X86)
978 .procname
= "panic_on_unrecovered_nmi",
979 .data
= &panic_on_unrecovered_nmi
,
980 .maxlen
= sizeof(int),
982 .proc_handler
= proc_dointvec
,
985 .procname
= "panic_on_io_nmi",
986 .data
= &panic_on_io_nmi
,
987 .maxlen
= sizeof(int),
989 .proc_handler
= proc_dointvec
,
991 #ifdef CONFIG_DEBUG_STACKOVERFLOW
993 .procname
= "panic_on_stackoverflow",
994 .data
= &sysctl_panic_on_stackoverflow
,
995 .maxlen
= sizeof(int),
997 .proc_handler
= proc_dointvec
,
1001 .procname
= "bootloader_type",
1002 .data
= &bootloader_type
,
1003 .maxlen
= sizeof (int),
1005 .proc_handler
= proc_dointvec
,
1008 .procname
= "bootloader_version",
1009 .data
= &bootloader_version
,
1010 .maxlen
= sizeof (int),
1012 .proc_handler
= proc_dointvec
,
1015 .procname
= "io_delay_type",
1016 .data
= &io_delay_type
,
1017 .maxlen
= sizeof(int),
1019 .proc_handler
= proc_dointvec
,
1022 #if defined(CONFIG_MMU)
1024 .procname
= "randomize_va_space",
1025 .data
= &randomize_va_space
,
1026 .maxlen
= sizeof(int),
1028 .proc_handler
= proc_dointvec
,
1031 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1033 .procname
= "spin_retry",
1034 .data
= &spin_retry
,
1035 .maxlen
= sizeof (int),
1037 .proc_handler
= proc_dointvec
,
1040 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1042 .procname
= "acpi_video_flags",
1043 .data
= &acpi_realmode_flags
,
1044 .maxlen
= sizeof (unsigned long),
1046 .proc_handler
= proc_doulongvec_minmax
,
1049 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1051 .procname
= "ignore-unaligned-usertrap",
1052 .data
= &no_unaligned_warning
,
1053 .maxlen
= sizeof (int),
1055 .proc_handler
= proc_dointvec
,
1060 .procname
= "unaligned-dump-stack",
1061 .data
= &unaligned_dump_stack
,
1062 .maxlen
= sizeof (int),
1064 .proc_handler
= proc_dointvec
,
1067 #ifdef CONFIG_DETECT_HUNG_TASK
1069 .procname
= "hung_task_panic",
1070 .data
= &sysctl_hung_task_panic
,
1071 .maxlen
= sizeof(int),
1073 .proc_handler
= proc_dointvec_minmax
,
1078 .procname
= "hung_task_check_count",
1079 .data
= &sysctl_hung_task_check_count
,
1080 .maxlen
= sizeof(int),
1082 .proc_handler
= proc_dointvec_minmax
,
1086 .procname
= "hung_task_timeout_secs",
1087 .data
= &sysctl_hung_task_timeout_secs
,
1088 .maxlen
= sizeof(unsigned long),
1090 .proc_handler
= proc_dohung_task_timeout_secs
,
1091 .extra2
= &hung_task_timeout_max
,
1094 .procname
= "hung_task_warnings",
1095 .data
= &sysctl_hung_task_warnings
,
1096 .maxlen
= sizeof(int),
1098 .proc_handler
= proc_dointvec_minmax
,
1102 #ifdef CONFIG_RT_MUTEXES
1104 .procname
= "max_lock_depth",
1105 .data
= &max_lock_depth
,
1106 .maxlen
= sizeof(int),
1108 .proc_handler
= proc_dointvec
,
1112 .procname
= "poweroff_cmd",
1113 .data
= &poweroff_cmd
,
1114 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1116 .proc_handler
= proc_dostring
,
1122 .child
= key_sysctls
,
1125 #ifdef CONFIG_PERF_EVENTS
1127 * User-space scripts rely on the existence of this file
1128 * as a feature check for perf_events being enabled.
1130 * So it's an ABI, do not remove!
1133 .procname
= "perf_event_paranoid",
1134 .data
= &sysctl_perf_event_paranoid
,
1135 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1137 .proc_handler
= proc_dointvec
,
1140 .procname
= "perf_event_mlock_kb",
1141 .data
= &sysctl_perf_event_mlock
,
1142 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1144 .proc_handler
= proc_dointvec
,
1147 .procname
= "perf_event_max_sample_rate",
1148 .data
= &sysctl_perf_event_sample_rate
,
1149 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1151 .proc_handler
= perf_proc_update_handler
,
1155 .procname
= "perf_cpu_time_max_percent",
1156 .data
= &sysctl_perf_cpu_time_max_percent
,
1157 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1159 .proc_handler
= perf_cpu_time_max_percent_handler
,
1161 .extra2
= &one_hundred
,
1164 .procname
= "perf_event_max_stack",
1165 .data
= &sysctl_perf_event_max_stack
,
1166 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1168 .proc_handler
= perf_event_max_stack_handler
,
1170 .extra2
= &six_hundred_forty_kb
,
1173 .procname
= "perf_event_max_contexts_per_stack",
1174 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1175 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1177 .proc_handler
= perf_event_max_stack_handler
,
1179 .extra2
= &one_thousand
,
1183 .procname
= "panic_on_warn",
1184 .data
= &panic_on_warn
,
1185 .maxlen
= sizeof(int),
1187 .proc_handler
= proc_dointvec_minmax
,
1191 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1193 .procname
= "timer_migration",
1194 .data
= &sysctl_timer_migration
,
1195 .maxlen
= sizeof(unsigned int),
1197 .proc_handler
= timer_migration_handler
,
1202 #ifdef CONFIG_BPF_SYSCALL
1204 .procname
= "unprivileged_bpf_disabled",
1205 .data
= &sysctl_unprivileged_bpf_disabled
,
1206 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1208 /* only handle a transition from default "0" to "1" */
1209 .proc_handler
= proc_dointvec_minmax
,
1214 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1216 .procname
= "panic_on_rcu_stall",
1217 .data
= &sysctl_panic_on_rcu_stall
,
1218 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1220 .proc_handler
= proc_dointvec_minmax
,
1228 static struct ctl_table vm_table
[] = {
1230 .procname
= "overcommit_memory",
1231 .data
= &sysctl_overcommit_memory
,
1232 .maxlen
= sizeof(sysctl_overcommit_memory
),
1234 .proc_handler
= proc_dointvec_minmax
,
1239 .procname
= "panic_on_oom",
1240 .data
= &sysctl_panic_on_oom
,
1241 .maxlen
= sizeof(sysctl_panic_on_oom
),
1243 .proc_handler
= proc_dointvec_minmax
,
1248 .procname
= "oom_kill_allocating_task",
1249 .data
= &sysctl_oom_kill_allocating_task
,
1250 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1252 .proc_handler
= proc_dointvec
,
1255 .procname
= "oom_dump_tasks",
1256 .data
= &sysctl_oom_dump_tasks
,
1257 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1259 .proc_handler
= proc_dointvec
,
1262 .procname
= "overcommit_ratio",
1263 .data
= &sysctl_overcommit_ratio
,
1264 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1266 .proc_handler
= overcommit_ratio_handler
,
1269 .procname
= "overcommit_kbytes",
1270 .data
= &sysctl_overcommit_kbytes
,
1271 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1273 .proc_handler
= overcommit_kbytes_handler
,
1276 .procname
= "page-cluster",
1277 .data
= &page_cluster
,
1278 .maxlen
= sizeof(int),
1280 .proc_handler
= proc_dointvec_minmax
,
1284 .procname
= "dirty_background_ratio",
1285 .data
= &dirty_background_ratio
,
1286 .maxlen
= sizeof(dirty_background_ratio
),
1288 .proc_handler
= dirty_background_ratio_handler
,
1290 .extra2
= &one_hundred
,
1293 .procname
= "dirty_background_bytes",
1294 .data
= &dirty_background_bytes
,
1295 .maxlen
= sizeof(dirty_background_bytes
),
1297 .proc_handler
= dirty_background_bytes_handler
,
1301 .procname
= "dirty_ratio",
1302 .data
= &vm_dirty_ratio
,
1303 .maxlen
= sizeof(vm_dirty_ratio
),
1305 .proc_handler
= dirty_ratio_handler
,
1307 .extra2
= &one_hundred
,
1310 .procname
= "dirty_bytes",
1311 .data
= &vm_dirty_bytes
,
1312 .maxlen
= sizeof(vm_dirty_bytes
),
1314 .proc_handler
= dirty_bytes_handler
,
1315 .extra1
= &dirty_bytes_min
,
1318 .procname
= "dirty_writeback_centisecs",
1319 .data
= &dirty_writeback_interval
,
1320 .maxlen
= sizeof(dirty_writeback_interval
),
1322 .proc_handler
= dirty_writeback_centisecs_handler
,
1325 .procname
= "dirty_expire_centisecs",
1326 .data
= &dirty_expire_interval
,
1327 .maxlen
= sizeof(dirty_expire_interval
),
1329 .proc_handler
= proc_dointvec_minmax
,
1333 .procname
= "dirtytime_expire_seconds",
1334 .data
= &dirtytime_expire_interval
,
1335 .maxlen
= sizeof(dirtytime_expire_interval
),
1337 .proc_handler
= dirtytime_interval_handler
,
1341 .procname
= "swappiness",
1342 .data
= &vm_swappiness
,
1343 .maxlen
= sizeof(vm_swappiness
),
1345 .proc_handler
= proc_dointvec_minmax
,
1347 .extra2
= &one_hundred
,
1349 #ifdef CONFIG_HUGETLB_PAGE
1351 .procname
= "nr_hugepages",
1353 .maxlen
= sizeof(unsigned long),
1355 .proc_handler
= hugetlb_sysctl_handler
,
1359 .procname
= "nr_hugepages_mempolicy",
1361 .maxlen
= sizeof(unsigned long),
1363 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1366 .procname
= "numa_stat",
1367 .data
= &sysctl_vm_numa_stat
,
1368 .maxlen
= sizeof(int),
1370 .proc_handler
= sysctl_vm_numa_stat_handler
,
1376 .procname
= "hugetlb_shm_group",
1377 .data
= &sysctl_hugetlb_shm_group
,
1378 .maxlen
= sizeof(gid_t
),
1380 .proc_handler
= proc_dointvec
,
1383 .procname
= "nr_overcommit_hugepages",
1385 .maxlen
= sizeof(unsigned long),
1387 .proc_handler
= hugetlb_overcommit_handler
,
1391 .procname
= "lowmem_reserve_ratio",
1392 .data
= &sysctl_lowmem_reserve_ratio
,
1393 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1395 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1398 .procname
= "drop_caches",
1399 .data
= &sysctl_drop_caches
,
1400 .maxlen
= sizeof(int),
1402 .proc_handler
= drop_caches_sysctl_handler
,
1406 #ifdef CONFIG_COMPACTION
1408 .procname
= "compact_memory",
1409 .data
= &sysctl_compact_memory
,
1410 .maxlen
= sizeof(int),
1412 .proc_handler
= sysctl_compaction_handler
,
1415 .procname
= "extfrag_threshold",
1416 .data
= &sysctl_extfrag_threshold
,
1417 .maxlen
= sizeof(int),
1419 .proc_handler
= sysctl_extfrag_handler
,
1420 .extra1
= &min_extfrag_threshold
,
1421 .extra2
= &max_extfrag_threshold
,
1424 .procname
= "compact_unevictable_allowed",
1425 .data
= &sysctl_compact_unevictable_allowed
,
1426 .maxlen
= sizeof(int),
1428 .proc_handler
= proc_dointvec
,
1433 #endif /* CONFIG_COMPACTION */
1435 .procname
= "min_free_kbytes",
1436 .data
= &min_free_kbytes
,
1437 .maxlen
= sizeof(min_free_kbytes
),
1439 .proc_handler
= min_free_kbytes_sysctl_handler
,
1443 .procname
= "watermark_scale_factor",
1444 .data
= &watermark_scale_factor
,
1445 .maxlen
= sizeof(watermark_scale_factor
),
1447 .proc_handler
= watermark_scale_factor_sysctl_handler
,
1449 .extra2
= &one_thousand
,
1452 .procname
= "percpu_pagelist_fraction",
1453 .data
= &percpu_pagelist_fraction
,
1454 .maxlen
= sizeof(percpu_pagelist_fraction
),
1456 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1461 .procname
= "max_map_count",
1462 .data
= &sysctl_max_map_count
,
1463 .maxlen
= sizeof(sysctl_max_map_count
),
1465 .proc_handler
= proc_dointvec_minmax
,
1470 .procname
= "nr_trim_pages",
1471 .data
= &sysctl_nr_trim_pages
,
1472 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1474 .proc_handler
= proc_dointvec_minmax
,
1479 .procname
= "laptop_mode",
1480 .data
= &laptop_mode
,
1481 .maxlen
= sizeof(laptop_mode
),
1483 .proc_handler
= proc_dointvec_jiffies
,
1486 .procname
= "block_dump",
1487 .data
= &block_dump
,
1488 .maxlen
= sizeof(block_dump
),
1490 .proc_handler
= proc_dointvec
,
1494 .procname
= "vfs_cache_pressure",
1495 .data
= &sysctl_vfs_cache_pressure
,
1496 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1498 .proc_handler
= proc_dointvec
,
1501 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1503 .procname
= "legacy_va_layout",
1504 .data
= &sysctl_legacy_va_layout
,
1505 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1507 .proc_handler
= proc_dointvec
,
1513 .procname
= "zone_reclaim_mode",
1514 .data
= &node_reclaim_mode
,
1515 .maxlen
= sizeof(node_reclaim_mode
),
1517 .proc_handler
= proc_dointvec
,
1521 .procname
= "min_unmapped_ratio",
1522 .data
= &sysctl_min_unmapped_ratio
,
1523 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1525 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1527 .extra2
= &one_hundred
,
1530 .procname
= "min_slab_ratio",
1531 .data
= &sysctl_min_slab_ratio
,
1532 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1534 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1536 .extra2
= &one_hundred
,
1541 .procname
= "stat_interval",
1542 .data
= &sysctl_stat_interval
,
1543 .maxlen
= sizeof(sysctl_stat_interval
),
1545 .proc_handler
= proc_dointvec_jiffies
,
1548 .procname
= "stat_refresh",
1552 .proc_handler
= vmstat_refresh
,
1557 .procname
= "mmap_min_addr",
1558 .data
= &dac_mmap_min_addr
,
1559 .maxlen
= sizeof(unsigned long),
1561 .proc_handler
= mmap_min_addr_handler
,
1566 .procname
= "numa_zonelist_order",
1567 .data
= &numa_zonelist_order
,
1568 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1570 .proc_handler
= numa_zonelist_order_handler
,
1573 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1574 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1576 .procname
= "vdso_enabled",
1577 #ifdef CONFIG_X86_32
1578 .data
= &vdso32_enabled
,
1579 .maxlen
= sizeof(vdso32_enabled
),
1581 .data
= &vdso_enabled
,
1582 .maxlen
= sizeof(vdso_enabled
),
1585 .proc_handler
= proc_dointvec
,
1589 #ifdef CONFIG_HIGHMEM
1591 .procname
= "highmem_is_dirtyable",
1592 .data
= &vm_highmem_is_dirtyable
,
1593 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1595 .proc_handler
= proc_dointvec_minmax
,
1600 #ifdef CONFIG_MEMORY_FAILURE
1602 .procname
= "memory_failure_early_kill",
1603 .data
= &sysctl_memory_failure_early_kill
,
1604 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1606 .proc_handler
= proc_dointvec_minmax
,
1611 .procname
= "memory_failure_recovery",
1612 .data
= &sysctl_memory_failure_recovery
,
1613 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1615 .proc_handler
= proc_dointvec_minmax
,
1621 .procname
= "user_reserve_kbytes",
1622 .data
= &sysctl_user_reserve_kbytes
,
1623 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1625 .proc_handler
= proc_doulongvec_minmax
,
1628 .procname
= "admin_reserve_kbytes",
1629 .data
= &sysctl_admin_reserve_kbytes
,
1630 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1632 .proc_handler
= proc_doulongvec_minmax
,
1634 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1636 .procname
= "mmap_rnd_bits",
1637 .data
= &mmap_rnd_bits
,
1638 .maxlen
= sizeof(mmap_rnd_bits
),
1640 .proc_handler
= proc_dointvec_minmax
,
1641 .extra1
= (void *)&mmap_rnd_bits_min
,
1642 .extra2
= (void *)&mmap_rnd_bits_max
,
1645 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1647 .procname
= "mmap_rnd_compat_bits",
1648 .data
= &mmap_rnd_compat_bits
,
1649 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1651 .proc_handler
= proc_dointvec_minmax
,
1652 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1653 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1659 static struct ctl_table fs_table
[] = {
1661 .procname
= "inode-nr",
1662 .data
= &inodes_stat
,
1663 .maxlen
= 2*sizeof(long),
1665 .proc_handler
= proc_nr_inodes
,
1668 .procname
= "inode-state",
1669 .data
= &inodes_stat
,
1670 .maxlen
= 7*sizeof(long),
1672 .proc_handler
= proc_nr_inodes
,
1675 .procname
= "file-nr",
1676 .data
= &files_stat
,
1677 .maxlen
= sizeof(files_stat
),
1679 .proc_handler
= proc_nr_files
,
1682 .procname
= "file-max",
1683 .data
= &files_stat
.max_files
,
1684 .maxlen
= sizeof(files_stat
.max_files
),
1686 .proc_handler
= proc_doulongvec_minmax
,
1689 .procname
= "nr_open",
1690 .data
= &sysctl_nr_open
,
1691 .maxlen
= sizeof(unsigned int),
1693 .proc_handler
= proc_dointvec_minmax
,
1694 .extra1
= &sysctl_nr_open_min
,
1695 .extra2
= &sysctl_nr_open_max
,
1698 .procname
= "dentry-state",
1699 .data
= &dentry_stat
,
1700 .maxlen
= 6*sizeof(long),
1702 .proc_handler
= proc_nr_dentry
,
1705 .procname
= "overflowuid",
1706 .data
= &fs_overflowuid
,
1707 .maxlen
= sizeof(int),
1709 .proc_handler
= proc_dointvec_minmax
,
1710 .extra1
= &minolduid
,
1711 .extra2
= &maxolduid
,
1714 .procname
= "overflowgid",
1715 .data
= &fs_overflowgid
,
1716 .maxlen
= sizeof(int),
1718 .proc_handler
= proc_dointvec_minmax
,
1719 .extra1
= &minolduid
,
1720 .extra2
= &maxolduid
,
1722 #ifdef CONFIG_FILE_LOCKING
1724 .procname
= "leases-enable",
1725 .data
= &leases_enable
,
1726 .maxlen
= sizeof(int),
1728 .proc_handler
= proc_dointvec
,
1731 #ifdef CONFIG_DNOTIFY
1733 .procname
= "dir-notify-enable",
1734 .data
= &dir_notify_enable
,
1735 .maxlen
= sizeof(int),
1737 .proc_handler
= proc_dointvec
,
1741 #ifdef CONFIG_FILE_LOCKING
1743 .procname
= "lease-break-time",
1744 .data
= &lease_break_time
,
1745 .maxlen
= sizeof(int),
1747 .proc_handler
= proc_dointvec
,
1752 .procname
= "aio-nr",
1754 .maxlen
= sizeof(aio_nr
),
1756 .proc_handler
= proc_doulongvec_minmax
,
1759 .procname
= "aio-max-nr",
1760 .data
= &aio_max_nr
,
1761 .maxlen
= sizeof(aio_max_nr
),
1763 .proc_handler
= proc_doulongvec_minmax
,
1765 #endif /* CONFIG_AIO */
1766 #ifdef CONFIG_INOTIFY_USER
1768 .procname
= "inotify",
1770 .child
= inotify_table
,
1775 .procname
= "epoll",
1777 .child
= epoll_table
,
1782 .procname
= "protected_symlinks",
1783 .data
= &sysctl_protected_symlinks
,
1784 .maxlen
= sizeof(int),
1786 .proc_handler
= proc_dointvec_minmax
,
1791 .procname
= "protected_hardlinks",
1792 .data
= &sysctl_protected_hardlinks
,
1793 .maxlen
= sizeof(int),
1795 .proc_handler
= proc_dointvec_minmax
,
1800 .procname
= "suid_dumpable",
1801 .data
= &suid_dumpable
,
1802 .maxlen
= sizeof(int),
1804 .proc_handler
= proc_dointvec_minmax_coredump
,
1808 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1810 .procname
= "binfmt_misc",
1812 .child
= sysctl_mount_point
,
1816 .procname
= "pipe-max-size",
1817 .data
= &pipe_max_size
,
1818 .maxlen
= sizeof(pipe_max_size
),
1820 .proc_handler
= proc_dopipe_max_size
,
1823 .procname
= "pipe-user-pages-hard",
1824 .data
= &pipe_user_pages_hard
,
1825 .maxlen
= sizeof(pipe_user_pages_hard
),
1827 .proc_handler
= proc_doulongvec_minmax
,
1830 .procname
= "pipe-user-pages-soft",
1831 .data
= &pipe_user_pages_soft
,
1832 .maxlen
= sizeof(pipe_user_pages_soft
),
1834 .proc_handler
= proc_doulongvec_minmax
,
1837 .procname
= "mount-max",
1838 .data
= &sysctl_mount_max
,
1839 .maxlen
= sizeof(unsigned int),
1841 .proc_handler
= proc_dointvec_minmax
,
1847 static struct ctl_table debug_table
[] = {
1848 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1850 .procname
= "exception-trace",
1851 .data
= &show_unhandled_signals
,
1852 .maxlen
= sizeof(int),
1854 .proc_handler
= proc_dointvec
1857 #if defined(CONFIG_OPTPROBES)
1859 .procname
= "kprobes-optimization",
1860 .data
= &sysctl_kprobes_optimization
,
1861 .maxlen
= sizeof(int),
1863 .proc_handler
= proc_kprobes_optimization_handler
,
1871 static struct ctl_table dev_table
[] = {
1875 int __init
sysctl_init(void)
1877 struct ctl_table_header
*hdr
;
1879 hdr
= register_sysctl_table(sysctl_base_table
);
1880 kmemleak_not_leak(hdr
);
1884 #endif /* CONFIG_SYSCTL */
1890 #ifdef CONFIG_PROC_SYSCTL
1892 static int _proc_do_string(char *data
, int maxlen
, int write
,
1893 char __user
*buffer
,
1894 size_t *lenp
, loff_t
*ppos
)
1900 if (!data
|| !maxlen
|| !*lenp
) {
1906 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1907 /* Only continue writes not past the end of buffer. */
1909 if (len
> maxlen
- 1)
1916 /* Start writing from beginning of buffer. */
1922 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1923 if (get_user(c
, p
++))
1925 if (c
== 0 || c
== '\n')
1946 if (copy_to_user(buffer
, data
, len
))
1949 if (put_user('\n', buffer
+ len
))
1959 static void warn_sysctl_write(struct ctl_table
*table
)
1961 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1962 "This will not be supported in the future. To silence this\n"
1963 "warning, set kernel.sysctl_writes_strict = -1\n",
1964 current
->comm
, table
->procname
);
1968 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1969 * @ppos: file position
1970 * @table: the sysctl table
1972 * Returns true if the first position is non-zero and the sysctl_writes_strict
1973 * mode indicates this is not allowed for numeric input types. String proc
1974 * hadlers can ignore the return value.
1976 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
1977 struct ctl_table
*table
)
1982 switch (sysctl_writes_strict
) {
1983 case SYSCTL_WRITES_STRICT
:
1985 case SYSCTL_WRITES_WARN
:
1986 warn_sysctl_write(table
);
1994 * proc_dostring - read a string sysctl
1995 * @table: the sysctl table
1996 * @write: %TRUE if this is a write to the sysctl file
1997 * @buffer: the user buffer
1998 * @lenp: the size of the user buffer
1999 * @ppos: file position
2001 * Reads/writes a string from/to the user buffer. If the kernel
2002 * buffer provided is not large enough to hold the string, the
2003 * string is truncated. The copied string is %NULL-terminated.
2004 * If the string is being read by the user process, it is copied
2005 * and a newline '\n' is added. It is truncated if the buffer is
2008 * Returns 0 on success.
2010 int proc_dostring(struct ctl_table
*table
, int write
,
2011 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2014 proc_first_pos_non_zero_ignore(ppos
, table
);
2016 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2017 (char __user
*)buffer
, lenp
, ppos
);
2020 static size_t proc_skip_spaces(char **buf
)
2023 char *tmp
= skip_spaces(*buf
);
2029 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2039 #define TMPBUFLEN 22
2041 * proc_get_long - reads an ASCII formatted integer from a user buffer
2043 * @buf: a kernel buffer
2044 * @size: size of the kernel buffer
2045 * @val: this is where the number will be stored
2046 * @neg: set to %TRUE if number is negative
2047 * @perm_tr: a vector which contains the allowed trailers
2048 * @perm_tr_len: size of the perm_tr vector
2049 * @tr: pointer to store the trailer character
2051 * In case of success %0 is returned and @buf and @size are updated with
2052 * the amount of bytes read. If @tr is non-NULL and a trailing
2053 * character exists (size is non-zero after returning from this
2054 * function), @tr is updated with the trailing character.
2056 static int proc_get_long(char **buf
, size_t *size
,
2057 unsigned long *val
, bool *neg
,
2058 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2061 char *p
, tmp
[TMPBUFLEN
];
2067 if (len
> TMPBUFLEN
- 1)
2068 len
= TMPBUFLEN
- 1;
2070 memcpy(tmp
, *buf
, len
);
2074 if (*p
== '-' && *size
> 1) {
2082 *val
= simple_strtoul(p
, &p
, 0);
2086 /* We don't know if the next char is whitespace thus we may accept
2087 * invalid integers (e.g. 1234...a) or two integers instead of one
2088 * (e.g. 123...1). So lets not allow such large numbers. */
2089 if (len
== TMPBUFLEN
- 1)
2092 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2095 if (tr
&& (len
< *size
))
2105 * proc_put_long - converts an integer to a decimal ASCII formatted string
2107 * @buf: the user buffer
2108 * @size: the size of the user buffer
2109 * @val: the integer to be converted
2110 * @neg: sign of the number, %TRUE for negative
2112 * In case of success %0 is returned and @buf and @size are updated with
2113 * the amount of bytes written.
2115 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2119 char tmp
[TMPBUFLEN
], *p
= tmp
;
2121 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2125 if (copy_to_user(*buf
, tmp
, len
))
2133 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2136 char __user
**buffer
= (char __user
**)buf
;
2137 if (put_user(c
, *buffer
))
2139 (*size
)--, (*buffer
)++;
2145 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2147 int write
, void *data
)
2151 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2155 if (*lvalp
> (unsigned long) INT_MAX
)
2163 *lvalp
= -(unsigned long)val
;
2166 *lvalp
= (unsigned long)val
;
2172 static int do_proc_douintvec_conv(unsigned long *lvalp
,
2174 int write
, void *data
)
2177 if (*lvalp
> UINT_MAX
)
2181 unsigned int val
= *valp
;
2182 *lvalp
= (unsigned long)val
;
2187 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2189 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2190 int write
, void __user
*buffer
,
2191 size_t *lenp
, loff_t
*ppos
,
2192 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2193 int write
, void *data
),
2196 int *i
, vleft
, first
= 1, err
= 0;
2198 char *kbuf
= NULL
, *p
;
2200 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2205 i
= (int *) tbl_data
;
2206 vleft
= table
->maxlen
/ sizeof(*i
);
2210 conv
= do_proc_dointvec_conv
;
2213 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2216 if (left
> PAGE_SIZE
- 1)
2217 left
= PAGE_SIZE
- 1;
2218 p
= kbuf
= memdup_user_nul(buffer
, left
);
2220 return PTR_ERR(kbuf
);
2223 for (; left
&& vleft
--; i
++, first
=0) {
2228 left
-= proc_skip_spaces(&p
);
2232 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2234 sizeof(proc_wspace_sep
), NULL
);
2237 if (conv(&neg
, &lval
, i
, 1, data
)) {
2242 if (conv(&neg
, &lval
, i
, 0, data
)) {
2247 err
= proc_put_char(&buffer
, &left
, '\t');
2250 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2256 if (!write
&& !first
&& left
&& !err
)
2257 err
= proc_put_char(&buffer
, &left
, '\n');
2258 if (write
&& !err
&& left
)
2259 left
-= proc_skip_spaces(&p
);
2263 return err
? : -EINVAL
;
2271 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2272 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2273 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2274 int write
, void *data
),
2277 return __do_proc_dointvec(table
->data
, table
, write
,
2278 buffer
, lenp
, ppos
, conv
, data
);
2281 static int do_proc_douintvec_w(unsigned int *tbl_data
,
2282 struct ctl_table
*table
,
2283 void __user
*buffer
,
2284 size_t *lenp
, loff_t
*ppos
,
2285 int (*conv
)(unsigned long *lvalp
,
2287 int write
, void *data
),
2294 char *kbuf
= NULL
, *p
;
2298 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2301 if (left
> PAGE_SIZE
- 1)
2302 left
= PAGE_SIZE
- 1;
2304 p
= kbuf
= memdup_user_nul(buffer
, left
);
2308 left
-= proc_skip_spaces(&p
);
2314 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2316 sizeof(proc_wspace_sep
), NULL
);
2322 if (conv(&lval
, tbl_data
, 1, data
)) {
2328 left
-= proc_skip_spaces(&p
);
2337 /* This is in keeping with old __do_proc_dointvec() */
2343 static int do_proc_douintvec_r(unsigned int *tbl_data
, void __user
*buffer
,
2344 size_t *lenp
, loff_t
*ppos
,
2345 int (*conv
)(unsigned long *lvalp
,
2347 int write
, void *data
),
2356 if (conv(&lval
, tbl_data
, 0, data
)) {
2361 err
= proc_put_long(&buffer
, &left
, lval
, false);
2365 err
= proc_put_char(&buffer
, &left
, '\n');
2374 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
2375 int write
, void __user
*buffer
,
2376 size_t *lenp
, loff_t
*ppos
,
2377 int (*conv
)(unsigned long *lvalp
,
2379 int write
, void *data
),
2382 unsigned int *i
, vleft
;
2384 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2389 i
= (unsigned int *) tbl_data
;
2390 vleft
= table
->maxlen
/ sizeof(*i
);
2393 * Arrays are not supported, keep this simple. *Do not* add
2402 conv
= do_proc_douintvec_conv
;
2405 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
2407 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
2410 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
2411 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2412 int (*conv
)(unsigned long *lvalp
,
2414 int write
, void *data
),
2417 return __do_proc_douintvec(table
->data
, table
, write
,
2418 buffer
, lenp
, ppos
, conv
, data
);
2422 * proc_dointvec - read a vector of integers
2423 * @table: the sysctl table
2424 * @write: %TRUE if this is a write to the sysctl file
2425 * @buffer: the user buffer
2426 * @lenp: the size of the user buffer
2427 * @ppos: file position
2429 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2430 * values from/to the user buffer, treated as an ASCII string.
2432 * Returns 0 on success.
2434 int proc_dointvec(struct ctl_table
*table
, int write
,
2435 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2437 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2441 * proc_douintvec - read a vector of unsigned integers
2442 * @table: the sysctl table
2443 * @write: %TRUE if this is a write to the sysctl file
2444 * @buffer: the user buffer
2445 * @lenp: the size of the user buffer
2446 * @ppos: file position
2448 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2449 * values from/to the user buffer, treated as an ASCII string.
2451 * Returns 0 on success.
2453 int proc_douintvec(struct ctl_table
*table
, int write
,
2454 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2456 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2457 do_proc_douintvec_conv
, NULL
);
2461 * Taint values can only be increased
2462 * This means we can safely use a temporary.
2464 static int proc_taint(struct ctl_table
*table
, int write
,
2465 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2468 unsigned long tmptaint
= get_taint();
2471 if (write
&& !capable(CAP_SYS_ADMIN
))
2476 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2482 * Poor man's atomic or. Not worth adding a primitive
2483 * to everyone's atomic.h for this
2486 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2487 if ((tmptaint
>> i
) & 1)
2488 add_taint(i
, LOCKDEP_STILL_OK
);
2495 #ifdef CONFIG_PRINTK
2496 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2497 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2499 if (write
&& !capable(CAP_SYS_ADMIN
))
2502 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2507 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2508 * @min: pointer to minimum allowable value
2509 * @max: pointer to maximum allowable value
2511 * The do_proc_dointvec_minmax_conv_param structure provides the
2512 * minimum and maximum values for doing range checking for those sysctl
2513 * parameters that use the proc_dointvec_minmax() handler.
2515 struct do_proc_dointvec_minmax_conv_param
{
2520 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2522 int write
, void *data
)
2524 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2526 int val
= *negp
? -*lvalp
: *lvalp
;
2527 if ((param
->min
&& *param
->min
> val
) ||
2528 (param
->max
&& *param
->max
< val
))
2535 *lvalp
= -(unsigned long)val
;
2538 *lvalp
= (unsigned long)val
;
2545 * proc_dointvec_minmax - read a vector of integers with min/max values
2546 * @table: the sysctl table
2547 * @write: %TRUE if this is a write to the sysctl file
2548 * @buffer: the user buffer
2549 * @lenp: the size of the user buffer
2550 * @ppos: file position
2552 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2553 * values from/to the user buffer, treated as an ASCII string.
2555 * This routine will ensure the values are within the range specified by
2556 * table->extra1 (min) and table->extra2 (max).
2558 * Returns 0 on success or -EINVAL on write when the range check fails.
2560 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2561 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2563 struct do_proc_dointvec_minmax_conv_param param
= {
2564 .min
= (int *) table
->extra1
,
2565 .max
= (int *) table
->extra2
,
2567 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2568 do_proc_dointvec_minmax_conv
, ¶m
);
2572 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2573 * @min: pointer to minimum allowable value
2574 * @max: pointer to maximum allowable value
2576 * The do_proc_douintvec_minmax_conv_param structure provides the
2577 * minimum and maximum values for doing range checking for those sysctl
2578 * parameters that use the proc_douintvec_minmax() handler.
2580 struct do_proc_douintvec_minmax_conv_param
{
2585 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
2587 int write
, void *data
)
2589 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
2592 unsigned int val
= *lvalp
;
2594 if (*lvalp
> UINT_MAX
)
2597 if ((param
->min
&& *param
->min
> val
) ||
2598 (param
->max
&& *param
->max
< val
))
2603 unsigned int val
= *valp
;
2604 *lvalp
= (unsigned long) val
;
2611 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2612 * @table: the sysctl table
2613 * @write: %TRUE if this is a write to the sysctl file
2614 * @buffer: the user buffer
2615 * @lenp: the size of the user buffer
2616 * @ppos: file position
2618 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2619 * values from/to the user buffer, treated as an ASCII string. Negative
2620 * strings are not allowed.
2622 * This routine will ensure the values are within the range specified by
2623 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2624 * check for UINT_MAX to avoid having to support wrap around uses from
2627 * Returns 0 on success or -ERANGE on write when the range check fails.
2629 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
2630 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2632 struct do_proc_douintvec_minmax_conv_param param
= {
2633 .min
= (unsigned int *) table
->extra1
,
2634 .max
= (unsigned int *) table
->extra2
,
2636 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2637 do_proc_douintvec_minmax_conv
, ¶m
);
2640 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp
,
2642 int write
, void *data
)
2647 val
= round_pipe_size(*lvalp
);
2653 unsigned int val
= *valp
;
2654 *lvalp
= (unsigned long) val
;
2660 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
2661 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2663 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2664 do_proc_dopipe_max_size_conv
, NULL
);
2667 static void validate_coredump_safety(void)
2669 #ifdef CONFIG_COREDUMP
2670 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2671 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2673 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2674 "Pipe handler or fully qualified core dump path required.\n"
2675 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2681 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2682 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2684 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2686 validate_coredump_safety();
2690 #ifdef CONFIG_COREDUMP
2691 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2692 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2694 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2696 validate_coredump_safety();
2701 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2702 void __user
*buffer
,
2703 size_t *lenp
, loff_t
*ppos
,
2704 unsigned long convmul
,
2705 unsigned long convdiv
)
2707 unsigned long *i
, *min
, *max
;
2708 int vleft
, first
= 1, err
= 0;
2710 char *kbuf
= NULL
, *p
;
2712 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2717 i
= (unsigned long *) data
;
2718 min
= (unsigned long *) table
->extra1
;
2719 max
= (unsigned long *) table
->extra2
;
2720 vleft
= table
->maxlen
/ sizeof(unsigned long);
2724 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2727 if (left
> PAGE_SIZE
- 1)
2728 left
= PAGE_SIZE
- 1;
2729 p
= kbuf
= memdup_user_nul(buffer
, left
);
2731 return PTR_ERR(kbuf
);
2734 for (; left
&& vleft
--; i
++, first
= 0) {
2740 left
-= proc_skip_spaces(&p
);
2742 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2744 sizeof(proc_wspace_sep
), NULL
);
2749 val
= convmul
* val
/ convdiv
;
2750 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2754 val
= convdiv
* (*i
) / convmul
;
2756 err
= proc_put_char(&buffer
, &left
, '\t');
2760 err
= proc_put_long(&buffer
, &left
, val
, false);
2766 if (!write
&& !first
&& left
&& !err
)
2767 err
= proc_put_char(&buffer
, &left
, '\n');
2769 left
-= proc_skip_spaces(&p
);
2773 return err
? : -EINVAL
;
2781 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2782 void __user
*buffer
,
2783 size_t *lenp
, loff_t
*ppos
,
2784 unsigned long convmul
,
2785 unsigned long convdiv
)
2787 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2788 buffer
, lenp
, ppos
, convmul
, convdiv
);
2792 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2793 * @table: the sysctl table
2794 * @write: %TRUE if this is a write to the sysctl file
2795 * @buffer: the user buffer
2796 * @lenp: the size of the user buffer
2797 * @ppos: file position
2799 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2800 * values from/to the user buffer, treated as an ASCII string.
2802 * This routine will ensure the values are within the range specified by
2803 * table->extra1 (min) and table->extra2 (max).
2805 * Returns 0 on success.
2807 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2808 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2810 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2814 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2815 * @table: the sysctl table
2816 * @write: %TRUE if this is a write to the sysctl file
2817 * @buffer: the user buffer
2818 * @lenp: the size of the user buffer
2819 * @ppos: file position
2821 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2822 * values from/to the user buffer, treated as an ASCII string. The values
2823 * are treated as milliseconds, and converted to jiffies when they are stored.
2825 * This routine will ensure the values are within the range specified by
2826 * table->extra1 (min) and table->extra2 (max).
2828 * Returns 0 on success.
2830 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2831 void __user
*buffer
,
2832 size_t *lenp
, loff_t
*ppos
)
2834 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2835 lenp
, ppos
, HZ
, 1000l);
2839 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2841 int write
, void *data
)
2844 if (*lvalp
> INT_MAX
/ HZ
)
2846 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2852 lval
= -(unsigned long)val
;
2855 lval
= (unsigned long)val
;
2862 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2864 int write
, void *data
)
2867 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2869 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2875 lval
= -(unsigned long)val
;
2878 lval
= (unsigned long)val
;
2880 *lvalp
= jiffies_to_clock_t(lval
);
2885 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2887 int write
, void *data
)
2890 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2900 lval
= -(unsigned long)val
;
2903 lval
= (unsigned long)val
;
2905 *lvalp
= jiffies_to_msecs(lval
);
2911 * proc_dointvec_jiffies - read a vector of integers as seconds
2912 * @table: the sysctl table
2913 * @write: %TRUE if this is a write to the sysctl file
2914 * @buffer: the user buffer
2915 * @lenp: the size of the user buffer
2916 * @ppos: file position
2918 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2919 * values from/to the user buffer, treated as an ASCII string.
2920 * The values read are assumed to be in seconds, and are converted into
2923 * Returns 0 on success.
2925 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2926 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2928 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2929 do_proc_dointvec_jiffies_conv
,NULL
);
2933 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2934 * @table: the sysctl table
2935 * @write: %TRUE if this is a write to the sysctl file
2936 * @buffer: the user buffer
2937 * @lenp: the size of the user buffer
2938 * @ppos: pointer to the file position
2940 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2941 * values from/to the user buffer, treated as an ASCII string.
2942 * The values read are assumed to be in 1/USER_HZ seconds, and
2943 * are converted into jiffies.
2945 * Returns 0 on success.
2947 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2948 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2950 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2951 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2955 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2956 * @table: the sysctl table
2957 * @write: %TRUE if this is a write to the sysctl file
2958 * @buffer: the user buffer
2959 * @lenp: the size of the user buffer
2960 * @ppos: file position
2961 * @ppos: the current position in the file
2963 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2964 * values from/to the user buffer, treated as an ASCII string.
2965 * The values read are assumed to be in 1/1000 seconds, and
2966 * are converted into jiffies.
2968 * Returns 0 on success.
2970 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2971 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2973 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2974 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2977 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2978 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2980 struct pid
*new_pid
;
2984 tmp
= pid_vnr(cad_pid
);
2986 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2987 lenp
, ppos
, NULL
, NULL
);
2991 new_pid
= find_get_pid(tmp
);
2995 put_pid(xchg(&cad_pid
, new_pid
));
3000 * proc_do_large_bitmap - read/write from/to a large bitmap
3001 * @table: the sysctl table
3002 * @write: %TRUE if this is a write to the sysctl file
3003 * @buffer: the user buffer
3004 * @lenp: the size of the user buffer
3005 * @ppos: file position
3007 * The bitmap is stored at table->data and the bitmap length (in bits)
3010 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3011 * large bitmaps may be represented in a compact manner. Writing into
3012 * the file will clear the bitmap then update it with the given input.
3014 * Returns 0 on success.
3016 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
3017 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3021 size_t left
= *lenp
;
3022 unsigned long bitmap_len
= table
->maxlen
;
3023 unsigned long *bitmap
= *(unsigned long **) table
->data
;
3024 unsigned long *tmp_bitmap
= NULL
;
3025 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
3027 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
3035 if (left
> PAGE_SIZE
- 1)
3036 left
= PAGE_SIZE
- 1;
3038 p
= kbuf
= memdup_user_nul(buffer
, left
);
3040 return PTR_ERR(kbuf
);
3042 tmp_bitmap
= kcalloc(BITS_TO_LONGS(bitmap_len
),
3043 sizeof(unsigned long),
3049 proc_skip_char(&p
, &left
, '\n');
3050 while (!err
&& left
) {
3051 unsigned long val_a
, val_b
;
3054 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
3058 if (val_a
>= bitmap_len
|| neg
) {
3070 err
= proc_get_long(&p
, &left
, &val_b
,
3071 &neg
, tr_b
, sizeof(tr_b
),
3075 if (val_b
>= bitmap_len
|| neg
||
3086 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
3088 proc_skip_char(&p
, &left
, '\n');
3092 unsigned long bit_a
, bit_b
= 0;
3095 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
3096 if (bit_a
>= bitmap_len
)
3098 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
3102 err
= proc_put_char(&buffer
, &left
, ',');
3106 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
3109 if (bit_a
!= bit_b
) {
3110 err
= proc_put_char(&buffer
, &left
, '-');
3113 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
3121 err
= proc_put_char(&buffer
, &left
, '\n');
3127 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
3129 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3139 #else /* CONFIG_PROC_SYSCTL */
3141 int proc_dostring(struct ctl_table
*table
, int write
,
3142 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3147 int proc_dointvec(struct ctl_table
*table
, int write
,
3148 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3153 int proc_douintvec(struct ctl_table
*table
, int write
,
3154 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3159 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3160 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3165 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
3166 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3171 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3172 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3177 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3178 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3183 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3184 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3189 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3190 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3195 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3196 void __user
*buffer
,
3197 size_t *lenp
, loff_t
*ppos
)
3203 #endif /* CONFIG_PROC_SYSCTL */
3206 * No sense putting this after each symbol definition, twice,
3207 * exception granted :-)
3209 EXPORT_SYMBOL(proc_dointvec
);
3210 EXPORT_SYMBOL(proc_douintvec
);
3211 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3212 EXPORT_SYMBOL(proc_dointvec_minmax
);
3213 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3214 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3215 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3216 EXPORT_SYMBOL(proc_dostring
);
3217 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3218 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);