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
94 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
95 #include <linux/stackleak.h>
97 #ifdef CONFIG_LOCKUP_DETECTOR
98 #include <linux/nmi.h>
101 #if defined(CONFIG_SYSCTL)
103 /* External variables not in a header file. */
104 extern int suid_dumpable
;
105 #ifdef CONFIG_COREDUMP
106 extern int core_uses_pid
;
107 extern char core_pattern
[];
108 extern unsigned int core_pipe_limit
;
111 extern int pid_max_min
, pid_max_max
;
112 extern int percpu_pagelist_fraction
;
113 extern int latencytop_enabled
;
114 extern unsigned int sysctl_nr_open_min
, sysctl_nr_open_max
;
116 extern int sysctl_nr_trim_pages
;
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty
= 60;
124 static int __maybe_unused neg_one
= -1;
127 static int __maybe_unused one
= 1;
128 static int __maybe_unused two
= 2;
129 static int __maybe_unused four
= 4;
130 static unsigned long one_ul
= 1;
131 static int one_hundred
= 100;
132 static int one_thousand
= 1000;
134 static int ten_thousand
= 10000;
136 #ifdef CONFIG_PERF_EVENTS
137 static int six_hundred_forty_kb
= 640 * 1024;
140 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
141 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
143 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
144 static int maxolduid
= 65535;
145 static int minolduid
;
147 static int ngroups_max
= NGROUPS_MAX
;
148 static const int cap_last_cap
= CAP_LAST_CAP
;
151 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
152 * and hung_task_check_interval_secs
154 #ifdef CONFIG_DETECT_HUNG_TASK
155 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
158 #ifdef CONFIG_INOTIFY_USER
159 #include <linux/inotify.h>
165 extern int pwrsw_enabled
;
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
169 extern int unaligned_enabled
;
173 extern int unaligned_dump_stack
;
176 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
177 extern int no_unaligned_warning
;
180 #ifdef CONFIG_PROC_SYSCTL
183 * enum sysctl_writes_mode - supported sysctl write modes
185 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
186 * to be written, and multiple writes on the same sysctl file descriptor
187 * will rewrite the sysctl value, regardless of file position. No warning
188 * is issued when the initial position is not 0.
189 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
191 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
192 * file position 0 and the value must be fully contained in the buffer
193 * sent to the write syscall. If dealing with strings respect the file
194 * position, but restrict this to the max length of the buffer, anything
195 * passed the max lenght will be ignored. Multiple writes will append
198 * These write modes control how current file position affects the behavior of
199 * updating sysctl values through the proc interface on each write.
201 enum sysctl_writes_mode
{
202 SYSCTL_WRITES_LEGACY
= -1,
203 SYSCTL_WRITES_WARN
= 0,
204 SYSCTL_WRITES_STRICT
= 1,
207 static enum sysctl_writes_mode sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
209 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
210 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
211 static int proc_taint(struct ctl_table
*table
, int write
,
212 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
216 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
217 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
220 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
221 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
222 #ifdef CONFIG_COREDUMP
223 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
224 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
226 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
227 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
229 #ifdef CONFIG_MAGIC_SYSRQ
230 /* Note: sysrq code uses its own private copy */
231 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
233 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
234 void __user
*buffer
, size_t *lenp
,
239 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
244 sysrq_toggle_support(__sysrq_enabled
);
251 static struct ctl_table kern_table
[];
252 static struct ctl_table vm_table
[];
253 static struct ctl_table fs_table
[];
254 static struct ctl_table debug_table
[];
255 static struct ctl_table dev_table
[];
256 extern struct ctl_table random_table
[];
258 extern struct ctl_table epoll_table
[];
261 #ifdef CONFIG_FW_LOADER_USER_HELPER
262 extern struct ctl_table firmware_config_table
[];
265 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
266 int sysctl_legacy_va_layout
;
269 /* The default sysctl tables: */
271 static struct ctl_table sysctl_base_table
[] = {
273 .procname
= "kernel",
290 .child
= debug_table
,
300 #ifdef CONFIG_SCHED_DEBUG
301 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
302 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
303 static int min_wakeup_granularity_ns
; /* 0 usecs */
304 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
306 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
307 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
308 #endif /* CONFIG_SMP */
309 #endif /* CONFIG_SCHED_DEBUG */
311 #ifdef CONFIG_COMPACTION
312 static int min_extfrag_threshold
;
313 static int max_extfrag_threshold
= 1000;
316 static struct ctl_table kern_table
[] = {
318 .procname
= "sched_child_runs_first",
319 .data
= &sysctl_sched_child_runs_first
,
320 .maxlen
= sizeof(unsigned int),
322 .proc_handler
= proc_dointvec
,
324 #ifdef CONFIG_SCHED_DEBUG
326 .procname
= "sched_min_granularity_ns",
327 .data
= &sysctl_sched_min_granularity
,
328 .maxlen
= sizeof(unsigned int),
330 .proc_handler
= sched_proc_update_handler
,
331 .extra1
= &min_sched_granularity_ns
,
332 .extra2
= &max_sched_granularity_ns
,
335 .procname
= "sched_latency_ns",
336 .data
= &sysctl_sched_latency
,
337 .maxlen
= sizeof(unsigned int),
339 .proc_handler
= sched_proc_update_handler
,
340 .extra1
= &min_sched_granularity_ns
,
341 .extra2
= &max_sched_granularity_ns
,
344 .procname
= "sched_wakeup_granularity_ns",
345 .data
= &sysctl_sched_wakeup_granularity
,
346 .maxlen
= sizeof(unsigned int),
348 .proc_handler
= sched_proc_update_handler
,
349 .extra1
= &min_wakeup_granularity_ns
,
350 .extra2
= &max_wakeup_granularity_ns
,
354 .procname
= "sched_tunable_scaling",
355 .data
= &sysctl_sched_tunable_scaling
,
356 .maxlen
= sizeof(enum sched_tunable_scaling
),
358 .proc_handler
= sched_proc_update_handler
,
359 .extra1
= &min_sched_tunable_scaling
,
360 .extra2
= &max_sched_tunable_scaling
,
363 .procname
= "sched_migration_cost_ns",
364 .data
= &sysctl_sched_migration_cost
,
365 .maxlen
= sizeof(unsigned int),
367 .proc_handler
= proc_dointvec
,
370 .procname
= "sched_nr_migrate",
371 .data
= &sysctl_sched_nr_migrate
,
372 .maxlen
= sizeof(unsigned int),
374 .proc_handler
= proc_dointvec
,
376 #ifdef CONFIG_SCHEDSTATS
378 .procname
= "sched_schedstats",
380 .maxlen
= sizeof(unsigned int),
382 .proc_handler
= sysctl_schedstats
,
386 #endif /* CONFIG_SCHEDSTATS */
387 #endif /* CONFIG_SMP */
388 #ifdef CONFIG_NUMA_BALANCING
390 .procname
= "numa_balancing_scan_delay_ms",
391 .data
= &sysctl_numa_balancing_scan_delay
,
392 .maxlen
= sizeof(unsigned int),
394 .proc_handler
= proc_dointvec
,
397 .procname
= "numa_balancing_scan_period_min_ms",
398 .data
= &sysctl_numa_balancing_scan_period_min
,
399 .maxlen
= sizeof(unsigned int),
401 .proc_handler
= proc_dointvec
,
404 .procname
= "numa_balancing_scan_period_max_ms",
405 .data
= &sysctl_numa_balancing_scan_period_max
,
406 .maxlen
= sizeof(unsigned int),
408 .proc_handler
= proc_dointvec
,
411 .procname
= "numa_balancing_scan_size_mb",
412 .data
= &sysctl_numa_balancing_scan_size
,
413 .maxlen
= sizeof(unsigned int),
415 .proc_handler
= proc_dointvec_minmax
,
419 .procname
= "numa_balancing",
420 .data
= NULL
, /* filled in by handler */
421 .maxlen
= sizeof(unsigned int),
423 .proc_handler
= sysctl_numa_balancing
,
427 #endif /* CONFIG_NUMA_BALANCING */
428 #endif /* CONFIG_SCHED_DEBUG */
430 .procname
= "sched_rt_period_us",
431 .data
= &sysctl_sched_rt_period
,
432 .maxlen
= sizeof(unsigned int),
434 .proc_handler
= sched_rt_handler
,
437 .procname
= "sched_rt_runtime_us",
438 .data
= &sysctl_sched_rt_runtime
,
439 .maxlen
= sizeof(int),
441 .proc_handler
= sched_rt_handler
,
444 .procname
= "sched_rr_timeslice_ms",
445 .data
= &sysctl_sched_rr_timeslice
,
446 .maxlen
= sizeof(int),
448 .proc_handler
= sched_rr_handler
,
450 #ifdef CONFIG_SCHED_AUTOGROUP
452 .procname
= "sched_autogroup_enabled",
453 .data
= &sysctl_sched_autogroup_enabled
,
454 .maxlen
= sizeof(unsigned int),
456 .proc_handler
= proc_dointvec_minmax
,
461 #ifdef CONFIG_CFS_BANDWIDTH
463 .procname
= "sched_cfs_bandwidth_slice_us",
464 .data
= &sysctl_sched_cfs_bandwidth_slice
,
465 .maxlen
= sizeof(unsigned int),
467 .proc_handler
= proc_dointvec_minmax
,
471 #ifdef CONFIG_PROVE_LOCKING
473 .procname
= "prove_locking",
474 .data
= &prove_locking
,
475 .maxlen
= sizeof(int),
477 .proc_handler
= proc_dointvec
,
480 #ifdef CONFIG_LOCK_STAT
482 .procname
= "lock_stat",
484 .maxlen
= sizeof(int),
486 .proc_handler
= proc_dointvec
,
491 .data
= &panic_timeout
,
492 .maxlen
= sizeof(int),
494 .proc_handler
= proc_dointvec
,
496 #ifdef CONFIG_COREDUMP
498 .procname
= "core_uses_pid",
499 .data
= &core_uses_pid
,
500 .maxlen
= sizeof(int),
502 .proc_handler
= proc_dointvec
,
505 .procname
= "core_pattern",
506 .data
= core_pattern
,
507 .maxlen
= CORENAME_MAX_SIZE
,
509 .proc_handler
= proc_dostring_coredump
,
512 .procname
= "core_pipe_limit",
513 .data
= &core_pipe_limit
,
514 .maxlen
= sizeof(unsigned int),
516 .proc_handler
= proc_dointvec
,
519 #ifdef CONFIG_PROC_SYSCTL
521 .procname
= "tainted",
522 .maxlen
= sizeof(long),
524 .proc_handler
= proc_taint
,
527 .procname
= "sysctl_writes_strict",
528 .data
= &sysctl_writes_strict
,
529 .maxlen
= sizeof(int),
531 .proc_handler
= proc_dointvec_minmax
,
536 #ifdef CONFIG_LATENCYTOP
538 .procname
= "latencytop",
539 .data
= &latencytop_enabled
,
540 .maxlen
= sizeof(int),
542 .proc_handler
= sysctl_latencytop
,
545 #ifdef CONFIG_BLK_DEV_INITRD
547 .procname
= "real-root-dev",
548 .data
= &real_root_dev
,
549 .maxlen
= sizeof(int),
551 .proc_handler
= proc_dointvec
,
555 .procname
= "print-fatal-signals",
556 .data
= &print_fatal_signals
,
557 .maxlen
= sizeof(int),
559 .proc_handler
= proc_dointvec
,
563 .procname
= "reboot-cmd",
564 .data
= reboot_command
,
567 .proc_handler
= proc_dostring
,
570 .procname
= "stop-a",
571 .data
= &stop_a_enabled
,
572 .maxlen
= sizeof (int),
574 .proc_handler
= proc_dointvec
,
577 .procname
= "scons-poweroff",
578 .data
= &scons_pwroff
,
579 .maxlen
= sizeof (int),
581 .proc_handler
= proc_dointvec
,
584 #ifdef CONFIG_SPARC64
586 .procname
= "tsb-ratio",
587 .data
= &sysctl_tsb_ratio
,
588 .maxlen
= sizeof (int),
590 .proc_handler
= proc_dointvec
,
595 .procname
= "soft-power",
596 .data
= &pwrsw_enabled
,
597 .maxlen
= sizeof (int),
599 .proc_handler
= proc_dointvec
,
602 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
604 .procname
= "unaligned-trap",
605 .data
= &unaligned_enabled
,
606 .maxlen
= sizeof (int),
608 .proc_handler
= proc_dointvec
,
612 .procname
= "ctrl-alt-del",
614 .maxlen
= sizeof(int),
616 .proc_handler
= proc_dointvec
,
618 #ifdef CONFIG_FUNCTION_TRACER
620 .procname
= "ftrace_enabled",
621 .data
= &ftrace_enabled
,
622 .maxlen
= sizeof(int),
624 .proc_handler
= ftrace_enable_sysctl
,
627 #ifdef CONFIG_STACK_TRACER
629 .procname
= "stack_tracer_enabled",
630 .data
= &stack_tracer_enabled
,
631 .maxlen
= sizeof(int),
633 .proc_handler
= stack_trace_sysctl
,
636 #ifdef CONFIG_TRACING
638 .procname
= "ftrace_dump_on_oops",
639 .data
= &ftrace_dump_on_oops
,
640 .maxlen
= sizeof(int),
642 .proc_handler
= proc_dointvec
,
645 .procname
= "traceoff_on_warning",
646 .data
= &__disable_trace_on_warning
,
647 .maxlen
= sizeof(__disable_trace_on_warning
),
649 .proc_handler
= proc_dointvec
,
652 .procname
= "tracepoint_printk",
653 .data
= &tracepoint_printk
,
654 .maxlen
= sizeof(tracepoint_printk
),
656 .proc_handler
= tracepoint_printk_sysctl
,
659 #ifdef CONFIG_KEXEC_CORE
661 .procname
= "kexec_load_disabled",
662 .data
= &kexec_load_disabled
,
663 .maxlen
= sizeof(int),
665 /* only handle a transition from default "0" to "1" */
666 .proc_handler
= proc_dointvec_minmax
,
671 #ifdef CONFIG_MODULES
673 .procname
= "modprobe",
674 .data
= &modprobe_path
,
675 .maxlen
= KMOD_PATH_LEN
,
677 .proc_handler
= proc_dostring
,
680 .procname
= "modules_disabled",
681 .data
= &modules_disabled
,
682 .maxlen
= sizeof(int),
684 /* only handle a transition from default "0" to "1" */
685 .proc_handler
= proc_dointvec_minmax
,
690 #ifdef CONFIG_UEVENT_HELPER
692 .procname
= "hotplug",
693 .data
= &uevent_helper
,
694 .maxlen
= UEVENT_HELPER_PATH_LEN
,
696 .proc_handler
= proc_dostring
,
699 #ifdef CONFIG_CHR_DEV_SG
701 .procname
= "sg-big-buff",
702 .data
= &sg_big_buff
,
703 .maxlen
= sizeof (int),
705 .proc_handler
= proc_dointvec
,
708 #ifdef CONFIG_BSD_PROCESS_ACCT
712 .maxlen
= 3*sizeof(int),
714 .proc_handler
= proc_dointvec
,
717 #ifdef CONFIG_MAGIC_SYSRQ
720 .data
= &__sysrq_enabled
,
721 .maxlen
= sizeof (int),
723 .proc_handler
= sysrq_sysctl_handler
,
726 #ifdef CONFIG_PROC_SYSCTL
728 .procname
= "cad_pid",
730 .maxlen
= sizeof (int),
732 .proc_handler
= proc_do_cad_pid
,
736 .procname
= "threads-max",
738 .maxlen
= sizeof(int),
740 .proc_handler
= sysctl_max_threads
,
743 .procname
= "random",
745 .child
= random_table
,
748 .procname
= "usermodehelper",
750 .child
= usermodehelper_table
,
752 #ifdef CONFIG_FW_LOADER_USER_HELPER
754 .procname
= "firmware_config",
756 .child
= firmware_config_table
,
760 .procname
= "overflowuid",
761 .data
= &overflowuid
,
762 .maxlen
= sizeof(int),
764 .proc_handler
= proc_dointvec_minmax
,
765 .extra1
= &minolduid
,
766 .extra2
= &maxolduid
,
769 .procname
= "overflowgid",
770 .data
= &overflowgid
,
771 .maxlen
= sizeof(int),
773 .proc_handler
= proc_dointvec_minmax
,
774 .extra1
= &minolduid
,
775 .extra2
= &maxolduid
,
778 #ifdef CONFIG_MATHEMU
780 .procname
= "ieee_emulation_warnings",
781 .data
= &sysctl_ieee_emulation_warnings
,
782 .maxlen
= sizeof(int),
784 .proc_handler
= proc_dointvec
,
788 .procname
= "userprocess_debug",
789 .data
= &show_unhandled_signals
,
790 .maxlen
= sizeof(int),
792 .proc_handler
= proc_dointvec
,
796 .procname
= "pid_max",
798 .maxlen
= sizeof (int),
800 .proc_handler
= proc_dointvec_minmax
,
801 .extra1
= &pid_max_min
,
802 .extra2
= &pid_max_max
,
805 .procname
= "panic_on_oops",
806 .data
= &panic_on_oops
,
807 .maxlen
= sizeof(int),
809 .proc_handler
= proc_dointvec
,
811 #if defined CONFIG_PRINTK
813 .procname
= "printk",
814 .data
= &console_loglevel
,
815 .maxlen
= 4*sizeof(int),
817 .proc_handler
= proc_dointvec
,
820 .procname
= "printk_ratelimit",
821 .data
= &printk_ratelimit_state
.interval
,
822 .maxlen
= sizeof(int),
824 .proc_handler
= proc_dointvec_jiffies
,
827 .procname
= "printk_ratelimit_burst",
828 .data
= &printk_ratelimit_state
.burst
,
829 .maxlen
= sizeof(int),
831 .proc_handler
= proc_dointvec
,
834 .procname
= "printk_delay",
835 .data
= &printk_delay_msec
,
836 .maxlen
= sizeof(int),
838 .proc_handler
= proc_dointvec_minmax
,
840 .extra2
= &ten_thousand
,
843 .procname
= "printk_devkmsg",
844 .data
= devkmsg_log_str
,
845 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
847 .proc_handler
= devkmsg_sysctl_set_loglvl
,
850 .procname
= "dmesg_restrict",
851 .data
= &dmesg_restrict
,
852 .maxlen
= sizeof(int),
854 .proc_handler
= proc_dointvec_minmax_sysadmin
,
859 .procname
= "kptr_restrict",
860 .data
= &kptr_restrict
,
861 .maxlen
= sizeof(int),
863 .proc_handler
= proc_dointvec_minmax_sysadmin
,
869 .procname
= "ngroups_max",
870 .data
= &ngroups_max
,
871 .maxlen
= sizeof (int),
873 .proc_handler
= proc_dointvec
,
876 .procname
= "cap_last_cap",
877 .data
= (void *)&cap_last_cap
,
878 .maxlen
= sizeof(int),
880 .proc_handler
= proc_dointvec
,
882 #if defined(CONFIG_LOCKUP_DETECTOR)
884 .procname
= "watchdog",
885 .data
= &watchdog_user_enabled
,
886 .maxlen
= sizeof(int),
888 .proc_handler
= proc_watchdog
,
893 .procname
= "watchdog_thresh",
894 .data
= &watchdog_thresh
,
895 .maxlen
= sizeof(int),
897 .proc_handler
= proc_watchdog_thresh
,
902 .procname
= "nmi_watchdog",
903 .data
= &nmi_watchdog_user_enabled
,
904 .maxlen
= sizeof(int),
905 .mode
= NMI_WATCHDOG_SYSCTL_PERM
,
906 .proc_handler
= proc_nmi_watchdog
,
911 .procname
= "watchdog_cpumask",
912 .data
= &watchdog_cpumask_bits
,
915 .proc_handler
= proc_watchdog_cpumask
,
917 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
919 .procname
= "soft_watchdog",
920 .data
= &soft_watchdog_user_enabled
,
921 .maxlen
= sizeof(int),
923 .proc_handler
= proc_soft_watchdog
,
928 .procname
= "softlockup_panic",
929 .data
= &softlockup_panic
,
930 .maxlen
= sizeof(int),
932 .proc_handler
= proc_dointvec_minmax
,
938 .procname
= "softlockup_all_cpu_backtrace",
939 .data
= &sysctl_softlockup_all_cpu_backtrace
,
940 .maxlen
= sizeof(int),
942 .proc_handler
= proc_dointvec_minmax
,
946 #endif /* CONFIG_SMP */
948 #ifdef CONFIG_HARDLOCKUP_DETECTOR
950 .procname
= "hardlockup_panic",
951 .data
= &hardlockup_panic
,
952 .maxlen
= sizeof(int),
954 .proc_handler
= proc_dointvec_minmax
,
960 .procname
= "hardlockup_all_cpu_backtrace",
961 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
962 .maxlen
= sizeof(int),
964 .proc_handler
= proc_dointvec_minmax
,
968 #endif /* CONFIG_SMP */
972 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
974 .procname
= "unknown_nmi_panic",
975 .data
= &unknown_nmi_panic
,
976 .maxlen
= sizeof (int),
978 .proc_handler
= proc_dointvec
,
981 #if defined(CONFIG_X86)
983 .procname
= "panic_on_unrecovered_nmi",
984 .data
= &panic_on_unrecovered_nmi
,
985 .maxlen
= sizeof(int),
987 .proc_handler
= proc_dointvec
,
990 .procname
= "panic_on_io_nmi",
991 .data
= &panic_on_io_nmi
,
992 .maxlen
= sizeof(int),
994 .proc_handler
= proc_dointvec
,
996 #ifdef CONFIG_DEBUG_STACKOVERFLOW
998 .procname
= "panic_on_stackoverflow",
999 .data
= &sysctl_panic_on_stackoverflow
,
1000 .maxlen
= sizeof(int),
1002 .proc_handler
= proc_dointvec
,
1006 .procname
= "bootloader_type",
1007 .data
= &bootloader_type
,
1008 .maxlen
= sizeof (int),
1010 .proc_handler
= proc_dointvec
,
1013 .procname
= "bootloader_version",
1014 .data
= &bootloader_version
,
1015 .maxlen
= sizeof (int),
1017 .proc_handler
= proc_dointvec
,
1020 .procname
= "io_delay_type",
1021 .data
= &io_delay_type
,
1022 .maxlen
= sizeof(int),
1024 .proc_handler
= proc_dointvec
,
1027 #if defined(CONFIG_MMU)
1029 .procname
= "randomize_va_space",
1030 .data
= &randomize_va_space
,
1031 .maxlen
= sizeof(int),
1033 .proc_handler
= proc_dointvec
,
1036 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1038 .procname
= "spin_retry",
1039 .data
= &spin_retry
,
1040 .maxlen
= sizeof (int),
1042 .proc_handler
= proc_dointvec
,
1045 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1047 .procname
= "acpi_video_flags",
1048 .data
= &acpi_realmode_flags
,
1049 .maxlen
= sizeof (unsigned long),
1051 .proc_handler
= proc_doulongvec_minmax
,
1054 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1056 .procname
= "ignore-unaligned-usertrap",
1057 .data
= &no_unaligned_warning
,
1058 .maxlen
= sizeof (int),
1060 .proc_handler
= proc_dointvec
,
1065 .procname
= "unaligned-dump-stack",
1066 .data
= &unaligned_dump_stack
,
1067 .maxlen
= sizeof (int),
1069 .proc_handler
= proc_dointvec
,
1072 #ifdef CONFIG_DETECT_HUNG_TASK
1074 .procname
= "hung_task_panic",
1075 .data
= &sysctl_hung_task_panic
,
1076 .maxlen
= sizeof(int),
1078 .proc_handler
= proc_dointvec_minmax
,
1083 .procname
= "hung_task_check_count",
1084 .data
= &sysctl_hung_task_check_count
,
1085 .maxlen
= sizeof(int),
1087 .proc_handler
= proc_dointvec_minmax
,
1091 .procname
= "hung_task_timeout_secs",
1092 .data
= &sysctl_hung_task_timeout_secs
,
1093 .maxlen
= sizeof(unsigned long),
1095 .proc_handler
= proc_dohung_task_timeout_secs
,
1096 .extra2
= &hung_task_timeout_max
,
1099 .procname
= "hung_task_check_interval_secs",
1100 .data
= &sysctl_hung_task_check_interval_secs
,
1101 .maxlen
= sizeof(unsigned long),
1103 .proc_handler
= proc_dohung_task_timeout_secs
,
1104 .extra2
= &hung_task_timeout_max
,
1107 .procname
= "hung_task_warnings",
1108 .data
= &sysctl_hung_task_warnings
,
1109 .maxlen
= sizeof(int),
1111 .proc_handler
= proc_dointvec_minmax
,
1115 #ifdef CONFIG_RT_MUTEXES
1117 .procname
= "max_lock_depth",
1118 .data
= &max_lock_depth
,
1119 .maxlen
= sizeof(int),
1121 .proc_handler
= proc_dointvec
,
1125 .procname
= "poweroff_cmd",
1126 .data
= &poweroff_cmd
,
1127 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1129 .proc_handler
= proc_dostring
,
1135 .child
= key_sysctls
,
1138 #ifdef CONFIG_PERF_EVENTS
1140 * User-space scripts rely on the existence of this file
1141 * as a feature check for perf_events being enabled.
1143 * So it's an ABI, do not remove!
1146 .procname
= "perf_event_paranoid",
1147 .data
= &sysctl_perf_event_paranoid
,
1148 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1150 .proc_handler
= proc_dointvec
,
1153 .procname
= "perf_event_mlock_kb",
1154 .data
= &sysctl_perf_event_mlock
,
1155 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1157 .proc_handler
= proc_dointvec
,
1160 .procname
= "perf_event_max_sample_rate",
1161 .data
= &sysctl_perf_event_sample_rate
,
1162 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1164 .proc_handler
= perf_proc_update_handler
,
1168 .procname
= "perf_cpu_time_max_percent",
1169 .data
= &sysctl_perf_cpu_time_max_percent
,
1170 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1172 .proc_handler
= perf_cpu_time_max_percent_handler
,
1174 .extra2
= &one_hundred
,
1177 .procname
= "perf_event_max_stack",
1178 .data
= &sysctl_perf_event_max_stack
,
1179 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1181 .proc_handler
= perf_event_max_stack_handler
,
1183 .extra2
= &six_hundred_forty_kb
,
1186 .procname
= "perf_event_max_contexts_per_stack",
1187 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1188 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1190 .proc_handler
= perf_event_max_stack_handler
,
1192 .extra2
= &one_thousand
,
1196 .procname
= "panic_on_warn",
1197 .data
= &panic_on_warn
,
1198 .maxlen
= sizeof(int),
1200 .proc_handler
= proc_dointvec_minmax
,
1204 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1206 .procname
= "timer_migration",
1207 .data
= &sysctl_timer_migration
,
1208 .maxlen
= sizeof(unsigned int),
1210 .proc_handler
= timer_migration_handler
,
1215 #ifdef CONFIG_BPF_SYSCALL
1217 .procname
= "unprivileged_bpf_disabled",
1218 .data
= &sysctl_unprivileged_bpf_disabled
,
1219 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1221 /* only handle a transition from default "0" to "1" */
1222 .proc_handler
= proc_dointvec_minmax
,
1227 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1229 .procname
= "panic_on_rcu_stall",
1230 .data
= &sysctl_panic_on_rcu_stall
,
1231 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1233 .proc_handler
= proc_dointvec_minmax
,
1238 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1240 .procname
= "stack_erasing",
1242 .maxlen
= sizeof(int),
1244 .proc_handler
= stack_erasing_sysctl
,
1252 static struct ctl_table vm_table
[] = {
1254 .procname
= "overcommit_memory",
1255 .data
= &sysctl_overcommit_memory
,
1256 .maxlen
= sizeof(sysctl_overcommit_memory
),
1258 .proc_handler
= proc_dointvec_minmax
,
1263 .procname
= "panic_on_oom",
1264 .data
= &sysctl_panic_on_oom
,
1265 .maxlen
= sizeof(sysctl_panic_on_oom
),
1267 .proc_handler
= proc_dointvec_minmax
,
1272 .procname
= "oom_kill_allocating_task",
1273 .data
= &sysctl_oom_kill_allocating_task
,
1274 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1276 .proc_handler
= proc_dointvec
,
1279 .procname
= "oom_dump_tasks",
1280 .data
= &sysctl_oom_dump_tasks
,
1281 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1283 .proc_handler
= proc_dointvec
,
1286 .procname
= "overcommit_ratio",
1287 .data
= &sysctl_overcommit_ratio
,
1288 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1290 .proc_handler
= overcommit_ratio_handler
,
1293 .procname
= "overcommit_kbytes",
1294 .data
= &sysctl_overcommit_kbytes
,
1295 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1297 .proc_handler
= overcommit_kbytes_handler
,
1300 .procname
= "page-cluster",
1301 .data
= &page_cluster
,
1302 .maxlen
= sizeof(int),
1304 .proc_handler
= proc_dointvec_minmax
,
1308 .procname
= "dirty_background_ratio",
1309 .data
= &dirty_background_ratio
,
1310 .maxlen
= sizeof(dirty_background_ratio
),
1312 .proc_handler
= dirty_background_ratio_handler
,
1314 .extra2
= &one_hundred
,
1317 .procname
= "dirty_background_bytes",
1318 .data
= &dirty_background_bytes
,
1319 .maxlen
= sizeof(dirty_background_bytes
),
1321 .proc_handler
= dirty_background_bytes_handler
,
1325 .procname
= "dirty_ratio",
1326 .data
= &vm_dirty_ratio
,
1327 .maxlen
= sizeof(vm_dirty_ratio
),
1329 .proc_handler
= dirty_ratio_handler
,
1331 .extra2
= &one_hundred
,
1334 .procname
= "dirty_bytes",
1335 .data
= &vm_dirty_bytes
,
1336 .maxlen
= sizeof(vm_dirty_bytes
),
1338 .proc_handler
= dirty_bytes_handler
,
1339 .extra1
= &dirty_bytes_min
,
1342 .procname
= "dirty_writeback_centisecs",
1343 .data
= &dirty_writeback_interval
,
1344 .maxlen
= sizeof(dirty_writeback_interval
),
1346 .proc_handler
= dirty_writeback_centisecs_handler
,
1349 .procname
= "dirty_expire_centisecs",
1350 .data
= &dirty_expire_interval
,
1351 .maxlen
= sizeof(dirty_expire_interval
),
1353 .proc_handler
= proc_dointvec_minmax
,
1357 .procname
= "dirtytime_expire_seconds",
1358 .data
= &dirtytime_expire_interval
,
1359 .maxlen
= sizeof(dirtytime_expire_interval
),
1361 .proc_handler
= dirtytime_interval_handler
,
1365 .procname
= "swappiness",
1366 .data
= &vm_swappiness
,
1367 .maxlen
= sizeof(vm_swappiness
),
1369 .proc_handler
= proc_dointvec_minmax
,
1371 .extra2
= &one_hundred
,
1373 #ifdef CONFIG_HUGETLB_PAGE
1375 .procname
= "nr_hugepages",
1377 .maxlen
= sizeof(unsigned long),
1379 .proc_handler
= hugetlb_sysctl_handler
,
1383 .procname
= "nr_hugepages_mempolicy",
1385 .maxlen
= sizeof(unsigned long),
1387 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1390 .procname
= "numa_stat",
1391 .data
= &sysctl_vm_numa_stat
,
1392 .maxlen
= sizeof(int),
1394 .proc_handler
= sysctl_vm_numa_stat_handler
,
1400 .procname
= "hugetlb_shm_group",
1401 .data
= &sysctl_hugetlb_shm_group
,
1402 .maxlen
= sizeof(gid_t
),
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
= "protected_fifos",
1825 .data
= &sysctl_protected_fifos
,
1826 .maxlen
= sizeof(int),
1828 .proc_handler
= proc_dointvec_minmax
,
1833 .procname
= "protected_regular",
1834 .data
= &sysctl_protected_regular
,
1835 .maxlen
= sizeof(int),
1837 .proc_handler
= proc_dointvec_minmax
,
1842 .procname
= "suid_dumpable",
1843 .data
= &suid_dumpable
,
1844 .maxlen
= sizeof(int),
1846 .proc_handler
= proc_dointvec_minmax_coredump
,
1850 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1852 .procname
= "binfmt_misc",
1854 .child
= sysctl_mount_point
,
1858 .procname
= "pipe-max-size",
1859 .data
= &pipe_max_size
,
1860 .maxlen
= sizeof(pipe_max_size
),
1862 .proc_handler
= proc_dopipe_max_size
,
1865 .procname
= "pipe-user-pages-hard",
1866 .data
= &pipe_user_pages_hard
,
1867 .maxlen
= sizeof(pipe_user_pages_hard
),
1869 .proc_handler
= proc_doulongvec_minmax
,
1872 .procname
= "pipe-user-pages-soft",
1873 .data
= &pipe_user_pages_soft
,
1874 .maxlen
= sizeof(pipe_user_pages_soft
),
1876 .proc_handler
= proc_doulongvec_minmax
,
1879 .procname
= "mount-max",
1880 .data
= &sysctl_mount_max
,
1881 .maxlen
= sizeof(unsigned int),
1883 .proc_handler
= proc_dointvec_minmax
,
1889 static struct ctl_table debug_table
[] = {
1890 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1892 .procname
= "exception-trace",
1893 .data
= &show_unhandled_signals
,
1894 .maxlen
= sizeof(int),
1896 .proc_handler
= proc_dointvec
1899 #if defined(CONFIG_OPTPROBES)
1901 .procname
= "kprobes-optimization",
1902 .data
= &sysctl_kprobes_optimization
,
1903 .maxlen
= sizeof(int),
1905 .proc_handler
= proc_kprobes_optimization_handler
,
1913 static struct ctl_table dev_table
[] = {
1917 int __init
sysctl_init(void)
1919 struct ctl_table_header
*hdr
;
1921 hdr
= register_sysctl_table(sysctl_base_table
);
1922 kmemleak_not_leak(hdr
);
1926 #endif /* CONFIG_SYSCTL */
1932 #ifdef CONFIG_PROC_SYSCTL
1934 static int _proc_do_string(char *data
, int maxlen
, int write
,
1935 char __user
*buffer
,
1936 size_t *lenp
, loff_t
*ppos
)
1942 if (!data
|| !maxlen
|| !*lenp
) {
1948 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1949 /* Only continue writes not past the end of buffer. */
1951 if (len
> maxlen
- 1)
1958 /* Start writing from beginning of buffer. */
1964 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1965 if (get_user(c
, p
++))
1967 if (c
== 0 || c
== '\n')
1988 if (copy_to_user(buffer
, data
, len
))
1991 if (put_user('\n', buffer
+ len
))
2001 static void warn_sysctl_write(struct ctl_table
*table
)
2003 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2004 "This will not be supported in the future. To silence this\n"
2005 "warning, set kernel.sysctl_writes_strict = -1\n",
2006 current
->comm
, table
->procname
);
2010 * proc_first_pos_non_zero_ignore - check if first position is allowed
2011 * @ppos: file position
2012 * @table: the sysctl table
2014 * Returns true if the first position is non-zero and the sysctl_writes_strict
2015 * mode indicates this is not allowed for numeric input types. String proc
2016 * handlers can ignore the return value.
2018 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
2019 struct ctl_table
*table
)
2024 switch (sysctl_writes_strict
) {
2025 case SYSCTL_WRITES_STRICT
:
2027 case SYSCTL_WRITES_WARN
:
2028 warn_sysctl_write(table
);
2036 * proc_dostring - read a string sysctl
2037 * @table: the sysctl table
2038 * @write: %TRUE if this is a write to the sysctl file
2039 * @buffer: the user buffer
2040 * @lenp: the size of the user buffer
2041 * @ppos: file position
2043 * Reads/writes a string from/to the user buffer. If the kernel
2044 * buffer provided is not large enough to hold the string, the
2045 * string is truncated. The copied string is %NULL-terminated.
2046 * If the string is being read by the user process, it is copied
2047 * and a newline '\n' is added. It is truncated if the buffer is
2050 * Returns 0 on success.
2052 int proc_dostring(struct ctl_table
*table
, int write
,
2053 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2056 proc_first_pos_non_zero_ignore(ppos
, table
);
2058 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2059 (char __user
*)buffer
, lenp
, ppos
);
2062 static size_t proc_skip_spaces(char **buf
)
2065 char *tmp
= skip_spaces(*buf
);
2071 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2081 #define TMPBUFLEN 22
2083 * proc_get_long - reads an ASCII formatted integer from a user buffer
2085 * @buf: a kernel buffer
2086 * @size: size of the kernel buffer
2087 * @val: this is where the number will be stored
2088 * @neg: set to %TRUE if number is negative
2089 * @perm_tr: a vector which contains the allowed trailers
2090 * @perm_tr_len: size of the perm_tr vector
2091 * @tr: pointer to store the trailer character
2093 * In case of success %0 is returned and @buf and @size are updated with
2094 * the amount of bytes read. If @tr is non-NULL and a trailing
2095 * character exists (size is non-zero after returning from this
2096 * function), @tr is updated with the trailing character.
2098 static int proc_get_long(char **buf
, size_t *size
,
2099 unsigned long *val
, bool *neg
,
2100 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2103 char *p
, tmp
[TMPBUFLEN
];
2109 if (len
> TMPBUFLEN
- 1)
2110 len
= TMPBUFLEN
- 1;
2112 memcpy(tmp
, *buf
, len
);
2116 if (*p
== '-' && *size
> 1) {
2124 *val
= simple_strtoul(p
, &p
, 0);
2128 /* We don't know if the next char is whitespace thus we may accept
2129 * invalid integers (e.g. 1234...a) or two integers instead of one
2130 * (e.g. 123...1). So lets not allow such large numbers. */
2131 if (len
== TMPBUFLEN
- 1)
2134 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2137 if (tr
&& (len
< *size
))
2147 * proc_put_long - converts an integer to a decimal ASCII formatted string
2149 * @buf: the user buffer
2150 * @size: the size of the user buffer
2151 * @val: the integer to be converted
2152 * @neg: sign of the number, %TRUE for negative
2154 * In case of success %0 is returned and @buf and @size are updated with
2155 * the amount of bytes written.
2157 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2161 char tmp
[TMPBUFLEN
], *p
= tmp
;
2163 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2167 if (copy_to_user(*buf
, tmp
, len
))
2175 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2178 char __user
**buffer
= (char __user
**)buf
;
2179 if (put_user(c
, *buffer
))
2181 (*size
)--, (*buffer
)++;
2187 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2189 int write
, void *data
)
2193 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2197 if (*lvalp
> (unsigned long) INT_MAX
)
2205 *lvalp
= -(unsigned long)val
;
2208 *lvalp
= (unsigned long)val
;
2214 static int do_proc_douintvec_conv(unsigned long *lvalp
,
2216 int write
, void *data
)
2219 if (*lvalp
> UINT_MAX
)
2223 unsigned int val
= *valp
;
2224 *lvalp
= (unsigned long)val
;
2229 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2231 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2232 int write
, void __user
*buffer
,
2233 size_t *lenp
, loff_t
*ppos
,
2234 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2235 int write
, void *data
),
2238 int *i
, vleft
, first
= 1, err
= 0;
2240 char *kbuf
= NULL
, *p
;
2242 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2247 i
= (int *) tbl_data
;
2248 vleft
= table
->maxlen
/ sizeof(*i
);
2252 conv
= do_proc_dointvec_conv
;
2255 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2258 if (left
> PAGE_SIZE
- 1)
2259 left
= PAGE_SIZE
- 1;
2260 p
= kbuf
= memdup_user_nul(buffer
, left
);
2262 return PTR_ERR(kbuf
);
2265 for (; left
&& vleft
--; i
++, first
=0) {
2270 left
-= proc_skip_spaces(&p
);
2274 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2276 sizeof(proc_wspace_sep
), NULL
);
2279 if (conv(&neg
, &lval
, i
, 1, data
)) {
2284 if (conv(&neg
, &lval
, i
, 0, data
)) {
2289 err
= proc_put_char(&buffer
, &left
, '\t');
2292 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2298 if (!write
&& !first
&& left
&& !err
)
2299 err
= proc_put_char(&buffer
, &left
, '\n');
2300 if (write
&& !err
&& left
)
2301 left
-= proc_skip_spaces(&p
);
2305 return err
? : -EINVAL
;
2313 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2314 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2315 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2316 int write
, void *data
),
2319 return __do_proc_dointvec(table
->data
, table
, write
,
2320 buffer
, lenp
, ppos
, conv
, data
);
2323 static int do_proc_douintvec_w(unsigned int *tbl_data
,
2324 struct ctl_table
*table
,
2325 void __user
*buffer
,
2326 size_t *lenp
, loff_t
*ppos
,
2327 int (*conv
)(unsigned long *lvalp
,
2329 int write
, void *data
),
2336 char *kbuf
= NULL
, *p
;
2340 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2343 if (left
> PAGE_SIZE
- 1)
2344 left
= PAGE_SIZE
- 1;
2346 p
= kbuf
= memdup_user_nul(buffer
, left
);
2350 left
-= proc_skip_spaces(&p
);
2356 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2358 sizeof(proc_wspace_sep
), NULL
);
2364 if (conv(&lval
, tbl_data
, 1, data
)) {
2370 left
-= proc_skip_spaces(&p
);
2379 /* This is in keeping with old __do_proc_dointvec() */
2385 static int do_proc_douintvec_r(unsigned int *tbl_data
, void __user
*buffer
,
2386 size_t *lenp
, loff_t
*ppos
,
2387 int (*conv
)(unsigned long *lvalp
,
2389 int write
, void *data
),
2398 if (conv(&lval
, tbl_data
, 0, data
)) {
2403 err
= proc_put_long(&buffer
, &left
, lval
, false);
2407 err
= proc_put_char(&buffer
, &left
, '\n');
2416 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
2417 int write
, void __user
*buffer
,
2418 size_t *lenp
, loff_t
*ppos
,
2419 int (*conv
)(unsigned long *lvalp
,
2421 int write
, void *data
),
2424 unsigned int *i
, vleft
;
2426 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2431 i
= (unsigned int *) tbl_data
;
2432 vleft
= table
->maxlen
/ sizeof(*i
);
2435 * Arrays are not supported, keep this simple. *Do not* add
2444 conv
= do_proc_douintvec_conv
;
2447 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
2449 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
2452 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
2453 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2454 int (*conv
)(unsigned long *lvalp
,
2456 int write
, void *data
),
2459 return __do_proc_douintvec(table
->data
, table
, write
,
2460 buffer
, lenp
, ppos
, conv
, data
);
2464 * proc_dointvec - read a vector of integers
2465 * @table: the sysctl table
2466 * @write: %TRUE if this is a write to the sysctl file
2467 * @buffer: the user buffer
2468 * @lenp: the size of the user buffer
2469 * @ppos: file position
2471 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2472 * values from/to the user buffer, treated as an ASCII string.
2474 * Returns 0 on success.
2476 int proc_dointvec(struct ctl_table
*table
, int write
,
2477 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2479 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2483 * proc_douintvec - read a vector of unsigned integers
2484 * @table: the sysctl table
2485 * @write: %TRUE if this is a write to the sysctl file
2486 * @buffer: the user buffer
2487 * @lenp: the size of the user buffer
2488 * @ppos: file position
2490 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2491 * values from/to the user buffer, treated as an ASCII string.
2493 * Returns 0 on success.
2495 int proc_douintvec(struct ctl_table
*table
, int write
,
2496 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2498 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2499 do_proc_douintvec_conv
, NULL
);
2503 * Taint values can only be increased
2504 * This means we can safely use a temporary.
2506 static int proc_taint(struct ctl_table
*table
, int write
,
2507 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2510 unsigned long tmptaint
= get_taint();
2513 if (write
&& !capable(CAP_SYS_ADMIN
))
2518 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2524 * Poor man's atomic or. Not worth adding a primitive
2525 * to everyone's atomic.h for this
2528 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2529 if ((tmptaint
>> i
) & 1)
2530 add_taint(i
, LOCKDEP_STILL_OK
);
2537 #ifdef CONFIG_PRINTK
2538 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2539 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2541 if (write
&& !capable(CAP_SYS_ADMIN
))
2544 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2549 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2550 * @min: pointer to minimum allowable value
2551 * @max: pointer to maximum allowable value
2553 * The do_proc_dointvec_minmax_conv_param structure provides the
2554 * minimum and maximum values for doing range checking for those sysctl
2555 * parameters that use the proc_dointvec_minmax() handler.
2557 struct do_proc_dointvec_minmax_conv_param
{
2562 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2564 int write
, void *data
)
2566 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2568 int val
= *negp
? -*lvalp
: *lvalp
;
2569 if ((param
->min
&& *param
->min
> val
) ||
2570 (param
->max
&& *param
->max
< val
))
2577 *lvalp
= -(unsigned long)val
;
2580 *lvalp
= (unsigned long)val
;
2587 * proc_dointvec_minmax - read a vector of integers with min/max values
2588 * @table: the sysctl table
2589 * @write: %TRUE if this is a write to the sysctl file
2590 * @buffer: the user buffer
2591 * @lenp: the size of the user buffer
2592 * @ppos: file position
2594 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2595 * values from/to the user buffer, treated as an ASCII string.
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 or -EINVAL on write when the range check fails.
2602 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2603 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2605 struct do_proc_dointvec_minmax_conv_param param
= {
2606 .min
= (int *) table
->extra1
,
2607 .max
= (int *) table
->extra2
,
2609 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2610 do_proc_dointvec_minmax_conv
, ¶m
);
2614 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2615 * @min: pointer to minimum allowable value
2616 * @max: pointer to maximum allowable value
2618 * The do_proc_douintvec_minmax_conv_param structure provides the
2619 * minimum and maximum values for doing range checking for those sysctl
2620 * parameters that use the proc_douintvec_minmax() handler.
2622 struct do_proc_douintvec_minmax_conv_param
{
2627 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
2629 int write
, void *data
)
2631 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
2634 unsigned int val
= *lvalp
;
2636 if (*lvalp
> UINT_MAX
)
2639 if ((param
->min
&& *param
->min
> val
) ||
2640 (param
->max
&& *param
->max
< val
))
2645 unsigned int val
= *valp
;
2646 *lvalp
= (unsigned long) val
;
2653 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2654 * @table: the sysctl table
2655 * @write: %TRUE if this is a write to the sysctl file
2656 * @buffer: the user buffer
2657 * @lenp: the size of the user buffer
2658 * @ppos: file position
2660 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2661 * values from/to the user buffer, treated as an ASCII string. Negative
2662 * strings are not allowed.
2664 * This routine will ensure the values are within the range specified by
2665 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2666 * check for UINT_MAX to avoid having to support wrap around uses from
2669 * Returns 0 on success or -ERANGE on write when the range check fails.
2671 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
2672 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2674 struct do_proc_douintvec_minmax_conv_param param
= {
2675 .min
= (unsigned int *) table
->extra1
,
2676 .max
= (unsigned int *) table
->extra2
,
2678 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2679 do_proc_douintvec_minmax_conv
, ¶m
);
2682 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp
,
2684 int write
, void *data
)
2689 val
= round_pipe_size(*lvalp
);
2695 unsigned int val
= *valp
;
2696 *lvalp
= (unsigned long) val
;
2702 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
2703 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2705 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2706 do_proc_dopipe_max_size_conv
, NULL
);
2709 static void validate_coredump_safety(void)
2711 #ifdef CONFIG_COREDUMP
2712 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2713 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2715 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2716 "Pipe handler or fully qualified core dump path required.\n"
2717 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2723 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2724 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2726 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2728 validate_coredump_safety();
2732 #ifdef CONFIG_COREDUMP
2733 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2734 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2736 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2738 validate_coredump_safety();
2743 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2744 void __user
*buffer
,
2745 size_t *lenp
, loff_t
*ppos
,
2746 unsigned long convmul
,
2747 unsigned long convdiv
)
2749 unsigned long *i
, *min
, *max
;
2750 int vleft
, first
= 1, err
= 0;
2752 char *kbuf
= NULL
, *p
;
2754 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2759 i
= (unsigned long *) data
;
2760 min
= (unsigned long *) table
->extra1
;
2761 max
= (unsigned long *) table
->extra2
;
2762 vleft
= table
->maxlen
/ sizeof(unsigned long);
2766 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2769 if (left
> PAGE_SIZE
- 1)
2770 left
= PAGE_SIZE
- 1;
2771 p
= kbuf
= memdup_user_nul(buffer
, left
);
2773 return PTR_ERR(kbuf
);
2776 for (; left
&& vleft
--; i
++, first
= 0) {
2782 left
-= proc_skip_spaces(&p
);
2784 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2786 sizeof(proc_wspace_sep
), NULL
);
2791 val
= convmul
* val
/ convdiv
;
2792 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2796 val
= convdiv
* (*i
) / convmul
;
2798 err
= proc_put_char(&buffer
, &left
, '\t');
2802 err
= proc_put_long(&buffer
, &left
, val
, false);
2808 if (!write
&& !first
&& left
&& !err
)
2809 err
= proc_put_char(&buffer
, &left
, '\n');
2811 left
-= proc_skip_spaces(&p
);
2815 return err
? : -EINVAL
;
2823 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2824 void __user
*buffer
,
2825 size_t *lenp
, loff_t
*ppos
,
2826 unsigned long convmul
,
2827 unsigned long convdiv
)
2829 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2830 buffer
, lenp
, ppos
, convmul
, convdiv
);
2834 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2835 * @table: the sysctl table
2836 * @write: %TRUE if this is a write to the sysctl file
2837 * @buffer: the user buffer
2838 * @lenp: the size of the user buffer
2839 * @ppos: file position
2841 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2842 * values from/to the user buffer, treated as an ASCII string.
2844 * This routine will ensure the values are within the range specified by
2845 * table->extra1 (min) and table->extra2 (max).
2847 * Returns 0 on success.
2849 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2850 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2852 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2856 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2857 * @table: the sysctl table
2858 * @write: %TRUE if this is a write to the sysctl file
2859 * @buffer: the user buffer
2860 * @lenp: the size of the user buffer
2861 * @ppos: file position
2863 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2864 * values from/to the user buffer, treated as an ASCII string. The values
2865 * are treated as milliseconds, and converted to jiffies when they are stored.
2867 * This routine will ensure the values are within the range specified by
2868 * table->extra1 (min) and table->extra2 (max).
2870 * Returns 0 on success.
2872 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2873 void __user
*buffer
,
2874 size_t *lenp
, loff_t
*ppos
)
2876 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2877 lenp
, ppos
, HZ
, 1000l);
2881 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2883 int write
, void *data
)
2886 if (*lvalp
> INT_MAX
/ HZ
)
2888 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2894 lval
= -(unsigned long)val
;
2897 lval
= (unsigned long)val
;
2904 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2906 int write
, void *data
)
2909 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2911 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2917 lval
= -(unsigned long)val
;
2920 lval
= (unsigned long)val
;
2922 *lvalp
= jiffies_to_clock_t(lval
);
2927 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2929 int write
, void *data
)
2932 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2942 lval
= -(unsigned long)val
;
2945 lval
= (unsigned long)val
;
2947 *lvalp
= jiffies_to_msecs(lval
);
2953 * proc_dointvec_jiffies - read a vector of integers as seconds
2954 * @table: the sysctl table
2955 * @write: %TRUE if this is a write to the sysctl file
2956 * @buffer: the user buffer
2957 * @lenp: the size of the user buffer
2958 * @ppos: file position
2960 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2961 * values from/to the user buffer, treated as an ASCII string.
2962 * The values read are assumed to be in seconds, and are converted into
2965 * Returns 0 on success.
2967 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2968 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2970 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2971 do_proc_dointvec_jiffies_conv
,NULL
);
2975 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2976 * @table: the sysctl table
2977 * @write: %TRUE if this is a write to the sysctl file
2978 * @buffer: the user buffer
2979 * @lenp: the size of the user buffer
2980 * @ppos: pointer to the file position
2982 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2983 * values from/to the user buffer, treated as an ASCII string.
2984 * The values read are assumed to be in 1/USER_HZ seconds, and
2985 * are converted into jiffies.
2987 * Returns 0 on success.
2989 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2990 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2992 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2993 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2997 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2998 * @table: the sysctl table
2999 * @write: %TRUE if this is a write to the sysctl file
3000 * @buffer: the user buffer
3001 * @lenp: the size of the user buffer
3002 * @ppos: file position
3003 * @ppos: the current position in the file
3005 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3006 * values from/to the user buffer, treated as an ASCII string.
3007 * The values read are assumed to be in 1/1000 seconds, and
3008 * are converted into jiffies.
3010 * Returns 0 on success.
3012 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3013 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3015 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
3016 do_proc_dointvec_ms_jiffies_conv
, NULL
);
3019 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
3020 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3022 struct pid
*new_pid
;
3026 tmp
= pid_vnr(cad_pid
);
3028 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
3029 lenp
, ppos
, NULL
, NULL
);
3033 new_pid
= find_get_pid(tmp
);
3037 put_pid(xchg(&cad_pid
, new_pid
));
3042 * proc_do_large_bitmap - read/write from/to a large bitmap
3043 * @table: the sysctl table
3044 * @write: %TRUE if this is a write to the sysctl file
3045 * @buffer: the user buffer
3046 * @lenp: the size of the user buffer
3047 * @ppos: file position
3049 * The bitmap is stored at table->data and the bitmap length (in bits)
3052 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3053 * large bitmaps may be represented in a compact manner. Writing into
3054 * the file will clear the bitmap then update it with the given input.
3056 * Returns 0 on success.
3058 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
3059 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3063 size_t left
= *lenp
;
3064 unsigned long bitmap_len
= table
->maxlen
;
3065 unsigned long *bitmap
= *(unsigned long **) table
->data
;
3066 unsigned long *tmp_bitmap
= NULL
;
3067 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
3069 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
3077 if (left
> PAGE_SIZE
- 1)
3078 left
= PAGE_SIZE
- 1;
3080 p
= kbuf
= memdup_user_nul(buffer
, left
);
3082 return PTR_ERR(kbuf
);
3084 tmp_bitmap
= kcalloc(BITS_TO_LONGS(bitmap_len
),
3085 sizeof(unsigned long),
3091 proc_skip_char(&p
, &left
, '\n');
3092 while (!err
&& left
) {
3093 unsigned long val_a
, val_b
;
3096 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
3100 if (val_a
>= bitmap_len
|| neg
) {
3112 err
= proc_get_long(&p
, &left
, &val_b
,
3113 &neg
, tr_b
, sizeof(tr_b
),
3117 if (val_b
>= bitmap_len
|| neg
||
3128 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
3130 proc_skip_char(&p
, &left
, '\n');
3134 unsigned long bit_a
, bit_b
= 0;
3137 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
3138 if (bit_a
>= bitmap_len
)
3140 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
3144 err
= proc_put_char(&buffer
, &left
, ',');
3148 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
3151 if (bit_a
!= bit_b
) {
3152 err
= proc_put_char(&buffer
, &left
, '-');
3155 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
3163 err
= proc_put_char(&buffer
, &left
, '\n');
3169 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
3171 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3181 #else /* CONFIG_PROC_SYSCTL */
3183 int proc_dostring(struct ctl_table
*table
, int write
,
3184 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3189 int proc_dointvec(struct ctl_table
*table
, int write
,
3190 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3195 int proc_douintvec(struct ctl_table
*table
, int write
,
3196 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3201 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3202 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3207 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
3208 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3213 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3214 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3219 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3220 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3225 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3226 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3231 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3232 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3237 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3238 void __user
*buffer
,
3239 size_t *lenp
, loff_t
*ppos
)
3245 #endif /* CONFIG_PROC_SYSCTL */
3248 * No sense putting this after each symbol definition, twice,
3249 * exception granted :-)
3251 EXPORT_SYMBOL(proc_dointvec
);
3252 EXPORT_SYMBOL(proc_douintvec
);
3253 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3254 EXPORT_SYMBOL(proc_dointvec_minmax
);
3255 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3256 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3257 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3258 EXPORT_SYMBOL(proc_dostring
);
3259 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3260 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);