2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/efi.h>
69 #include <linux/mount.h>
71 #include <asm/uaccess.h>
72 #include <linux/mutex.h>
73 #include <asm/processor.h>
78 #include <asm/stacktrace.h>
82 #include <asm/setup.h>
84 #ifdef CONFIG_BSD_PROCESS_ACCT
85 #include <linux/acct.h>
87 #ifdef CONFIG_RT_MUTEXES
88 #include <linux/rtmutex.h>
90 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
91 #include <linux/lockdep.h>
93 #ifdef CONFIG_CHR_DEV_SG
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
;
110 #ifdef CONFIG_USER_NS
111 extern int unprivileged_userns_clone
;
114 extern int pid_max_min
, pid_max_max
;
115 extern int percpu_pagelist_fraction
;
116 extern int compat_log
;
117 extern int latencytop_enabled
;
118 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
120 extern int sysctl_nr_trim_pages
;
123 /* Constants used for minimum and maximum */
124 #ifdef CONFIG_LOCKUP_DETECTOR
125 static int sixty
= 60;
128 static int __maybe_unused neg_one
= -1;
131 static int __maybe_unused one
= 1;
132 static int __maybe_unused two
= 2;
133 static int __maybe_unused four
= 4;
134 static unsigned long one_ul
= 1;
135 static int one_hundred
= 100;
137 static int ten_thousand
= 10000;
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
;
150 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
151 #ifdef CONFIG_DETECT_HUNG_TASK
152 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
155 #ifdef CONFIG_INOTIFY_USER
156 #include <linux/inotify.h>
162 extern int pwrsw_enabled
;
165 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
166 extern int unaligned_enabled
;
170 extern int unaligned_dump_stack
;
173 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
174 extern int no_unaligned_warning
;
177 #ifdef CONFIG_PROC_SYSCTL
179 #define SYSCTL_WRITES_LEGACY -1
180 #define SYSCTL_WRITES_WARN 0
181 #define SYSCTL_WRITES_STRICT 1
183 static int sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
185 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
186 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
187 static int proc_taint(struct ctl_table
*table
, int write
,
188 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
192 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
193 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
196 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
197 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
198 #ifdef CONFIG_COREDUMP
199 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
200 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
204 int proc_dointvec_ibrs_ctrl(struct ctl_table
*table
, int write
,
205 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
206 int proc_dointvec_ibpb_ctrl(struct ctl_table
*table
, int write
,
207 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
208 int proc_dointvec_ibrs_dump(struct ctl_table
*table
, int write
,
209 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
212 #ifdef CONFIG_MAGIC_SYSRQ
213 /* Note: sysrq code uses it's own private copy */
214 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
216 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
217 void __user
*buffer
, size_t *lenp
,
222 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
227 sysrq_toggle_support(__sysrq_enabled
);
234 static struct ctl_table kern_table
[];
235 static struct ctl_table vm_table
[];
236 static struct ctl_table fs_table
[];
237 static struct ctl_table debug_table
[];
238 static struct ctl_table dev_table
[];
239 extern struct ctl_table random_table
[];
241 extern struct ctl_table epoll_table
[];
244 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
245 int sysctl_legacy_va_layout
;
248 u32 sysctl_ibrs_dump
= 0;
249 u32 sysctl_ibrs_enabled
= 0;
250 EXPORT_SYMBOL(sysctl_ibrs_enabled
);
251 u32 sysctl_ibpb_enabled
= 0;
252 EXPORT_SYMBOL(sysctl_ibpb_enabled
);
254 /* The default sysctl tables: */
256 static struct ctl_table sysctl_base_table
[] = {
258 .procname
= "kernel",
275 .child
= debug_table
,
285 #ifdef CONFIG_SCHED_DEBUG
286 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
287 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
288 static int min_wakeup_granularity_ns
; /* 0 usecs */
289 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
291 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
292 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
293 #endif /* CONFIG_SMP */
294 #endif /* CONFIG_SCHED_DEBUG */
296 #ifdef CONFIG_COMPACTION
297 static int min_extfrag_threshold
;
298 static int max_extfrag_threshold
= 1000;
301 static unsigned int secure_boot_enabled
;
302 int secure_boot_proc_handler(struct ctl_table
*table
, int write
,
303 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
305 secure_boot_enabled
= efi_enabled(EFI_SECURE_BOOT
);
306 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
309 static unsigned int moksbstate_disabled
;
310 int moksbstate_disabled_proc_handler(struct ctl_table
*table
, int write
,
311 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
313 moksbstate_disabled
= efi_enabled(EFI_MOKSBSTATE_DISABLED
);
314 return proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
317 static struct ctl_table kern_table
[] = {
319 .procname
= "secure_boot",
320 .data
= &secure_boot_enabled
,
321 .maxlen
= sizeof(unsigned int),
323 .proc_handler
= secure_boot_proc_handler
,
326 .procname
= "moksbstate_disabled",
327 .data
= &moksbstate_disabled
,
328 .maxlen
= sizeof(unsigned int),
330 .proc_handler
= moksbstate_disabled_proc_handler
,
333 .procname
= "sched_child_runs_first",
334 .data
= &sysctl_sched_child_runs_first
,
335 .maxlen
= sizeof(unsigned int),
337 .proc_handler
= proc_dointvec
,
339 #ifdef CONFIG_SCHED_DEBUG
341 .procname
= "sched_min_granularity_ns",
342 .data
= &sysctl_sched_min_granularity
,
343 .maxlen
= sizeof(unsigned int),
345 .proc_handler
= sched_proc_update_handler
,
346 .extra1
= &min_sched_granularity_ns
,
347 .extra2
= &max_sched_granularity_ns
,
350 .procname
= "sched_latency_ns",
351 .data
= &sysctl_sched_latency
,
352 .maxlen
= sizeof(unsigned int),
354 .proc_handler
= sched_proc_update_handler
,
355 .extra1
= &min_sched_granularity_ns
,
356 .extra2
= &max_sched_granularity_ns
,
359 .procname
= "sched_wakeup_granularity_ns",
360 .data
= &sysctl_sched_wakeup_granularity
,
361 .maxlen
= sizeof(unsigned int),
363 .proc_handler
= sched_proc_update_handler
,
364 .extra1
= &min_wakeup_granularity_ns
,
365 .extra2
= &max_wakeup_granularity_ns
,
369 .procname
= "sched_tunable_scaling",
370 .data
= &sysctl_sched_tunable_scaling
,
371 .maxlen
= sizeof(enum sched_tunable_scaling
),
373 .proc_handler
= sched_proc_update_handler
,
374 .extra1
= &min_sched_tunable_scaling
,
375 .extra2
= &max_sched_tunable_scaling
,
378 .procname
= "sched_migration_cost_ns",
379 .data
= &sysctl_sched_migration_cost
,
380 .maxlen
= sizeof(unsigned int),
382 .proc_handler
= proc_dointvec
,
385 .procname
= "sched_nr_migrate",
386 .data
= &sysctl_sched_nr_migrate
,
387 .maxlen
= sizeof(unsigned int),
389 .proc_handler
= proc_dointvec
,
392 .procname
= "sched_time_avg_ms",
393 .data
= &sysctl_sched_time_avg
,
394 .maxlen
= sizeof(unsigned int),
396 .proc_handler
= proc_dointvec
,
399 .procname
= "sched_shares_window_ns",
400 .data
= &sysctl_sched_shares_window
,
401 .maxlen
= sizeof(unsigned int),
403 .proc_handler
= proc_dointvec
,
405 #endif /* CONFIG_SMP */
406 #ifdef CONFIG_NUMA_BALANCING
408 .procname
= "numa_balancing_scan_delay_ms",
409 .data
= &sysctl_numa_balancing_scan_delay
,
410 .maxlen
= sizeof(unsigned int),
412 .proc_handler
= proc_dointvec
,
415 .procname
= "numa_balancing_scan_period_min_ms",
416 .data
= &sysctl_numa_balancing_scan_period_min
,
417 .maxlen
= sizeof(unsigned int),
419 .proc_handler
= proc_dointvec
,
422 .procname
= "numa_balancing_scan_period_max_ms",
423 .data
= &sysctl_numa_balancing_scan_period_max
,
424 .maxlen
= sizeof(unsigned int),
426 .proc_handler
= proc_dointvec
,
429 .procname
= "numa_balancing_scan_size_mb",
430 .data
= &sysctl_numa_balancing_scan_size
,
431 .maxlen
= sizeof(unsigned int),
433 .proc_handler
= proc_dointvec_minmax
,
437 .procname
= "numa_balancing",
438 .data
= NULL
, /* filled in by handler */
439 .maxlen
= sizeof(unsigned int),
441 .proc_handler
= sysctl_numa_balancing
,
445 #endif /* CONFIG_NUMA_BALANCING */
446 #endif /* CONFIG_SCHED_DEBUG */
448 .procname
= "sched_rt_period_us",
449 .data
= &sysctl_sched_rt_period
,
450 .maxlen
= sizeof(unsigned int),
452 .proc_handler
= sched_rt_handler
,
455 .procname
= "sched_rt_runtime_us",
456 .data
= &sysctl_sched_rt_runtime
,
457 .maxlen
= sizeof(int),
459 .proc_handler
= sched_rt_handler
,
462 .procname
= "sched_rr_timeslice_ms",
463 .data
= &sched_rr_timeslice
,
464 .maxlen
= sizeof(int),
466 .proc_handler
= sched_rr_handler
,
468 #ifdef CONFIG_SCHED_AUTOGROUP
470 .procname
= "sched_autogroup_enabled",
471 .data
= &sysctl_sched_autogroup_enabled
,
472 .maxlen
= sizeof(unsigned int),
474 .proc_handler
= proc_dointvec_minmax
,
479 #ifdef CONFIG_CFS_BANDWIDTH
481 .procname
= "sched_cfs_bandwidth_slice_us",
482 .data
= &sysctl_sched_cfs_bandwidth_slice
,
483 .maxlen
= sizeof(unsigned int),
485 .proc_handler
= proc_dointvec_minmax
,
489 #ifdef CONFIG_PROVE_LOCKING
491 .procname
= "prove_locking",
492 .data
= &prove_locking
,
493 .maxlen
= sizeof(int),
495 .proc_handler
= proc_dointvec
,
498 #ifdef CONFIG_LOCK_STAT
500 .procname
= "lock_stat",
502 .maxlen
= sizeof(int),
504 .proc_handler
= proc_dointvec
,
509 .data
= &panic_timeout
,
510 .maxlen
= sizeof(int),
512 .proc_handler
= proc_dointvec
,
514 #ifdef CONFIG_COREDUMP
516 .procname
= "core_uses_pid",
517 .data
= &core_uses_pid
,
518 .maxlen
= sizeof(int),
520 .proc_handler
= proc_dointvec
,
523 .procname
= "core_pattern",
524 .data
= core_pattern
,
525 .maxlen
= CORENAME_MAX_SIZE
,
527 .proc_handler
= proc_dostring_coredump
,
530 .procname
= "core_pipe_limit",
531 .data
= &core_pipe_limit
,
532 .maxlen
= sizeof(unsigned int),
534 .proc_handler
= proc_dointvec
,
537 #ifdef CONFIG_USER_NS
539 .procname
= "unprivileged_userns_clone",
540 .data
= &unprivileged_userns_clone
,
541 .maxlen
= sizeof(int),
543 .proc_handler
= proc_dointvec
,
546 #ifdef CONFIG_PROC_SYSCTL
548 .procname
= "tainted",
549 .maxlen
= sizeof(long),
551 .proc_handler
= proc_taint
,
554 .procname
= "sysctl_writes_strict",
555 .data
= &sysctl_writes_strict
,
556 .maxlen
= sizeof(int),
558 .proc_handler
= proc_dointvec_minmax
,
563 #ifdef CONFIG_LATENCYTOP
565 .procname
= "latencytop",
566 .data
= &latencytop_enabled
,
567 .maxlen
= sizeof(int),
569 .proc_handler
= proc_dointvec
,
572 #ifdef CONFIG_BLK_DEV_INITRD
574 .procname
= "real-root-dev",
575 .data
= &real_root_dev
,
576 .maxlen
= sizeof(int),
578 .proc_handler
= proc_dointvec
,
582 .procname
= "print-fatal-signals",
583 .data
= &print_fatal_signals
,
584 .maxlen
= sizeof(int),
586 .proc_handler
= proc_dointvec
,
590 .procname
= "reboot-cmd",
591 .data
= reboot_command
,
594 .proc_handler
= proc_dostring
,
597 .procname
= "stop-a",
598 .data
= &stop_a_enabled
,
599 .maxlen
= sizeof (int),
601 .proc_handler
= proc_dointvec
,
604 .procname
= "scons-poweroff",
605 .data
= &scons_pwroff
,
606 .maxlen
= sizeof (int),
608 .proc_handler
= proc_dointvec
,
611 #ifdef CONFIG_SPARC64
613 .procname
= "tsb-ratio",
614 .data
= &sysctl_tsb_ratio
,
615 .maxlen
= sizeof (int),
617 .proc_handler
= proc_dointvec
,
622 .procname
= "soft-power",
623 .data
= &pwrsw_enabled
,
624 .maxlen
= sizeof (int),
626 .proc_handler
= proc_dointvec
,
629 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
631 .procname
= "unaligned-trap",
632 .data
= &unaligned_enabled
,
633 .maxlen
= sizeof (int),
635 .proc_handler
= proc_dointvec
,
639 .procname
= "ctrl-alt-del",
641 .maxlen
= sizeof(int),
643 .proc_handler
= proc_dointvec
,
645 #ifdef CONFIG_FUNCTION_TRACER
647 .procname
= "ftrace_enabled",
648 .data
= &ftrace_enabled
,
649 .maxlen
= sizeof(int),
651 .proc_handler
= ftrace_enable_sysctl
,
654 #ifdef CONFIG_STACK_TRACER
656 .procname
= "stack_tracer_enabled",
657 .data
= &stack_tracer_enabled
,
658 .maxlen
= sizeof(int),
660 .proc_handler
= stack_trace_sysctl
,
663 #ifdef CONFIG_TRACING
665 .procname
= "ftrace_dump_on_oops",
666 .data
= &ftrace_dump_on_oops
,
667 .maxlen
= sizeof(int),
669 .proc_handler
= proc_dointvec
,
672 .procname
= "traceoff_on_warning",
673 .data
= &__disable_trace_on_warning
,
674 .maxlen
= sizeof(__disable_trace_on_warning
),
676 .proc_handler
= proc_dointvec
,
679 .procname
= "tracepoint_printk",
680 .data
= &tracepoint_printk
,
681 .maxlen
= sizeof(tracepoint_printk
),
683 .proc_handler
= proc_dointvec
,
686 #ifdef CONFIG_KEXEC_CORE
688 .procname
= "kexec_load_disabled",
689 .data
= &kexec_load_disabled
,
690 .maxlen
= sizeof(int),
692 /* only handle a transition from default "0" to "1" */
693 .proc_handler
= proc_dointvec_minmax
,
698 #ifdef CONFIG_MODULES
700 .procname
= "modprobe",
701 .data
= &modprobe_path
,
702 .maxlen
= KMOD_PATH_LEN
,
704 .proc_handler
= proc_dostring
,
707 .procname
= "modules_disabled",
708 .data
= &modules_disabled
,
709 .maxlen
= sizeof(int),
711 /* only handle a transition from default "0" to "1" */
712 .proc_handler
= proc_dointvec_minmax
,
717 #ifdef CONFIG_UEVENT_HELPER
719 .procname
= "hotplug",
720 .data
= &uevent_helper
,
721 .maxlen
= UEVENT_HELPER_PATH_LEN
,
723 .proc_handler
= proc_dostring
,
726 #ifdef CONFIG_CHR_DEV_SG
728 .procname
= "sg-big-buff",
729 .data
= &sg_big_buff
,
730 .maxlen
= sizeof (int),
732 .proc_handler
= proc_dointvec
,
735 #ifdef CONFIG_BSD_PROCESS_ACCT
739 .maxlen
= 3*sizeof(int),
741 .proc_handler
= proc_dointvec
,
744 #ifdef CONFIG_MAGIC_SYSRQ
747 .data
= &__sysrq_enabled
,
748 .maxlen
= sizeof (int),
750 .proc_handler
= sysrq_sysctl_handler
,
753 #ifdef CONFIG_PROC_SYSCTL
755 .procname
= "cad_pid",
757 .maxlen
= sizeof (int),
759 .proc_handler
= proc_do_cad_pid
,
763 .procname
= "threads-max",
765 .maxlen
= sizeof(int),
767 .proc_handler
= sysctl_max_threads
,
770 .procname
= "random",
772 .child
= random_table
,
775 .procname
= "usermodehelper",
777 .child
= usermodehelper_table
,
780 .procname
= "overflowuid",
781 .data
= &overflowuid
,
782 .maxlen
= sizeof(int),
784 .proc_handler
= proc_dointvec_minmax
,
785 .extra1
= &minolduid
,
786 .extra2
= &maxolduid
,
789 .procname
= "overflowgid",
790 .data
= &overflowgid
,
791 .maxlen
= sizeof(int),
793 .proc_handler
= proc_dointvec_minmax
,
794 .extra1
= &minolduid
,
795 .extra2
= &maxolduid
,
798 #ifdef CONFIG_MATHEMU
800 .procname
= "ieee_emulation_warnings",
801 .data
= &sysctl_ieee_emulation_warnings
,
802 .maxlen
= sizeof(int),
804 .proc_handler
= proc_dointvec
,
808 .procname
= "userprocess_debug",
809 .data
= &show_unhandled_signals
,
810 .maxlen
= sizeof(int),
812 .proc_handler
= proc_dointvec
,
816 .procname
= "pid_max",
818 .maxlen
= sizeof (int),
820 .proc_handler
= proc_dointvec_minmax
,
821 .extra1
= &pid_max_min
,
822 .extra2
= &pid_max_max
,
825 .procname
= "panic_on_oops",
826 .data
= &panic_on_oops
,
827 .maxlen
= sizeof(int),
829 .proc_handler
= proc_dointvec
,
831 #if defined CONFIG_PRINTK
833 .procname
= "printk",
834 .data
= &console_loglevel
,
835 .maxlen
= 4*sizeof(int),
837 .proc_handler
= proc_dointvec
,
840 .procname
= "printk_ratelimit",
841 .data
= &printk_ratelimit_state
.interval
,
842 .maxlen
= sizeof(int),
844 .proc_handler
= proc_dointvec_jiffies
,
847 .procname
= "printk_ratelimit_burst",
848 .data
= &printk_ratelimit_state
.burst
,
849 .maxlen
= sizeof(int),
851 .proc_handler
= proc_dointvec
,
854 .procname
= "printk_delay",
855 .data
= &printk_delay_msec
,
856 .maxlen
= sizeof(int),
858 .proc_handler
= proc_dointvec_minmax
,
860 .extra2
= &ten_thousand
,
863 .procname
= "dmesg_restrict",
864 .data
= &dmesg_restrict
,
865 .maxlen
= sizeof(int),
867 .proc_handler
= proc_dointvec_minmax_sysadmin
,
872 .procname
= "kptr_restrict",
873 .data
= &kptr_restrict
,
874 .maxlen
= sizeof(int),
876 .proc_handler
= proc_dointvec_minmax_sysadmin
,
882 .procname
= "ngroups_max",
883 .data
= &ngroups_max
,
884 .maxlen
= sizeof (int),
886 .proc_handler
= proc_dointvec
,
889 .procname
= "cap_last_cap",
890 .data
= (void *)&cap_last_cap
,
891 .maxlen
= sizeof(int),
893 .proc_handler
= proc_dointvec
,
895 #if defined(CONFIG_LOCKUP_DETECTOR)
897 .procname
= "watchdog",
898 .data
= &watchdog_user_enabled
,
899 .maxlen
= sizeof (int),
901 .proc_handler
= proc_watchdog
,
906 .procname
= "watchdog_thresh",
907 .data
= &watchdog_thresh
,
908 .maxlen
= sizeof(int),
910 .proc_handler
= proc_watchdog_thresh
,
915 .procname
= "nmi_watchdog",
916 .data
= &nmi_watchdog_enabled
,
917 .maxlen
= sizeof (int),
919 .proc_handler
= proc_nmi_watchdog
,
921 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
928 .procname
= "soft_watchdog",
929 .data
= &soft_watchdog_enabled
,
930 .maxlen
= sizeof (int),
932 .proc_handler
= proc_soft_watchdog
,
937 .procname
= "watchdog_cpumask",
938 .data
= &watchdog_cpumask_bits
,
941 .proc_handler
= proc_watchdog_cpumask
,
944 .procname
= "softlockup_panic",
945 .data
= &softlockup_panic
,
946 .maxlen
= sizeof(int),
948 .proc_handler
= proc_dointvec_minmax
,
952 #ifdef CONFIG_HARDLOCKUP_DETECTOR
954 .procname
= "hardlockup_panic",
955 .data
= &hardlockup_panic
,
956 .maxlen
= sizeof(int),
958 .proc_handler
= proc_dointvec_minmax
,
965 .procname
= "softlockup_all_cpu_backtrace",
966 .data
= &sysctl_softlockup_all_cpu_backtrace
,
967 .maxlen
= sizeof(int),
969 .proc_handler
= proc_dointvec_minmax
,
974 .procname
= "hardlockup_all_cpu_backtrace",
975 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
976 .maxlen
= sizeof(int),
978 .proc_handler
= proc_dointvec_minmax
,
982 #endif /* CONFIG_SMP */
984 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
986 .procname
= "unknown_nmi_panic",
987 .data
= &unknown_nmi_panic
,
988 .maxlen
= sizeof (int),
990 .proc_handler
= proc_dointvec
,
993 #if defined(CONFIG_X86)
995 .procname
= "panic_on_unrecovered_nmi",
996 .data
= &panic_on_unrecovered_nmi
,
997 .maxlen
= sizeof(int),
999 .proc_handler
= proc_dointvec
,
1002 .procname
= "panic_on_io_nmi",
1003 .data
= &panic_on_io_nmi
,
1004 .maxlen
= sizeof(int),
1006 .proc_handler
= proc_dointvec
,
1008 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1010 .procname
= "panic_on_stackoverflow",
1011 .data
= &sysctl_panic_on_stackoverflow
,
1012 .maxlen
= sizeof(int),
1014 .proc_handler
= proc_dointvec
,
1018 .procname
= "bootloader_type",
1019 .data
= &bootloader_type
,
1020 .maxlen
= sizeof (int),
1022 .proc_handler
= proc_dointvec
,
1025 .procname
= "bootloader_version",
1026 .data
= &bootloader_version
,
1027 .maxlen
= sizeof (int),
1029 .proc_handler
= proc_dointvec
,
1032 .procname
= "kstack_depth_to_print",
1033 .data
= &kstack_depth_to_print
,
1034 .maxlen
= sizeof(int),
1036 .proc_handler
= proc_dointvec
,
1039 .procname
= "io_delay_type",
1040 .data
= &io_delay_type
,
1041 .maxlen
= sizeof(int),
1043 .proc_handler
= proc_dointvec
,
1046 #if defined(CONFIG_MMU)
1048 .procname
= "randomize_va_space",
1049 .data
= &randomize_va_space
,
1050 .maxlen
= sizeof(int),
1052 .proc_handler
= proc_dointvec
,
1055 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1057 .procname
= "spin_retry",
1058 .data
= &spin_retry
,
1059 .maxlen
= sizeof (int),
1061 .proc_handler
= proc_dointvec
,
1064 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1066 .procname
= "acpi_video_flags",
1067 .data
= &acpi_realmode_flags
,
1068 .maxlen
= sizeof (unsigned long),
1070 .proc_handler
= proc_doulongvec_minmax
,
1073 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1075 .procname
= "ignore-unaligned-usertrap",
1076 .data
= &no_unaligned_warning
,
1077 .maxlen
= sizeof (int),
1079 .proc_handler
= proc_dointvec
,
1084 .procname
= "unaligned-dump-stack",
1085 .data
= &unaligned_dump_stack
,
1086 .maxlen
= sizeof (int),
1088 .proc_handler
= proc_dointvec
,
1091 #ifdef CONFIG_DETECT_HUNG_TASK
1093 .procname
= "hung_task_panic",
1094 .data
= &sysctl_hung_task_panic
,
1095 .maxlen
= sizeof(int),
1097 .proc_handler
= proc_dointvec_minmax
,
1102 .procname
= "hung_task_check_count",
1103 .data
= &sysctl_hung_task_check_count
,
1104 .maxlen
= sizeof(int),
1106 .proc_handler
= proc_dointvec_minmax
,
1110 .procname
= "hung_task_timeout_secs",
1111 .data
= &sysctl_hung_task_timeout_secs
,
1112 .maxlen
= sizeof(unsigned long),
1114 .proc_handler
= proc_dohung_task_timeout_secs
,
1115 .extra2
= &hung_task_timeout_max
,
1118 .procname
= "hung_task_warnings",
1119 .data
= &sysctl_hung_task_warnings
,
1120 .maxlen
= sizeof(int),
1122 .proc_handler
= proc_dointvec_minmax
,
1126 #ifdef CONFIG_COMPAT
1128 .procname
= "compat-log",
1129 .data
= &compat_log
,
1130 .maxlen
= sizeof (int),
1132 .proc_handler
= proc_dointvec
,
1135 #ifdef CONFIG_RT_MUTEXES
1137 .procname
= "max_lock_depth",
1138 .data
= &max_lock_depth
,
1139 .maxlen
= sizeof(int),
1141 .proc_handler
= proc_dointvec
,
1145 .procname
= "poweroff_cmd",
1146 .data
= &poweroff_cmd
,
1147 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1149 .proc_handler
= proc_dostring
,
1155 .child
= key_sysctls
,
1158 #ifdef CONFIG_PERF_EVENTS
1160 * User-space scripts rely on the existence of this file
1161 * as a feature check for perf_events being enabled.
1163 * So it's an ABI, do not remove!
1166 .procname
= "perf_event_paranoid",
1167 .data
= &sysctl_perf_event_paranoid
,
1168 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1170 .proc_handler
= proc_dointvec
,
1173 .procname
= "perf_event_mlock_kb",
1174 .data
= &sysctl_perf_event_mlock
,
1175 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1177 .proc_handler
= proc_dointvec
,
1180 .procname
= "perf_event_max_sample_rate",
1181 .data
= &sysctl_perf_event_sample_rate
,
1182 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1184 .proc_handler
= perf_proc_update_handler
,
1188 .procname
= "perf_cpu_time_max_percent",
1189 .data
= &sysctl_perf_cpu_time_max_percent
,
1190 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1192 .proc_handler
= perf_cpu_time_max_percent_handler
,
1194 .extra2
= &one_hundred
,
1197 #ifdef CONFIG_KMEMCHECK
1199 .procname
= "kmemcheck",
1200 .data
= &kmemcheck_enabled
,
1201 .maxlen
= sizeof(int),
1203 .proc_handler
= proc_dointvec
,
1207 .procname
= "panic_on_warn",
1208 .data
= &panic_on_warn
,
1209 .maxlen
= sizeof(int),
1211 .proc_handler
= proc_dointvec_minmax
,
1215 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1217 .procname
= "timer_migration",
1218 .data
= &sysctl_timer_migration
,
1219 .maxlen
= sizeof(unsigned int),
1221 .proc_handler
= timer_migration_handler
,
1226 #ifdef CONFIG_BPF_SYSCALL
1228 .procname
= "unprivileged_bpf_disabled",
1229 .data
= &sysctl_unprivileged_bpf_disabled
,
1230 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1232 /* only handle a transition from default "0" to "1" */
1233 .proc_handler
= proc_dointvec_minmax
,
1240 .procname
= "ibrs_enabled",
1241 .data
= &sysctl_ibrs_enabled
,
1242 .maxlen
= sizeof(unsigned int),
1244 .proc_handler
= proc_dointvec_ibrs_ctrl
,
1249 .procname
= "ibpb_enabled",
1250 .data
= &sysctl_ibpb_enabled
,
1251 .maxlen
= sizeof(unsigned int),
1253 .proc_handler
= proc_dointvec_ibpb_ctrl
,
1258 .procname
= "ibrs_dump",
1259 .data
= &sysctl_ibrs_dump
,
1260 .maxlen
= sizeof(unsigned int),
1262 .proc_handler
= proc_dointvec_ibrs_dump
,
1270 static struct ctl_table vm_table
[] = {
1272 .procname
= "overcommit_memory",
1273 .data
= &sysctl_overcommit_memory
,
1274 .maxlen
= sizeof(sysctl_overcommit_memory
),
1276 .proc_handler
= proc_dointvec_minmax
,
1281 .procname
= "panic_on_oom",
1282 .data
= &sysctl_panic_on_oom
,
1283 .maxlen
= sizeof(sysctl_panic_on_oom
),
1285 .proc_handler
= proc_dointvec_minmax
,
1290 .procname
= "oom_kill_allocating_task",
1291 .data
= &sysctl_oom_kill_allocating_task
,
1292 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1294 .proc_handler
= proc_dointvec
,
1297 .procname
= "oom_dump_tasks",
1298 .data
= &sysctl_oom_dump_tasks
,
1299 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1301 .proc_handler
= proc_dointvec
,
1304 .procname
= "overcommit_ratio",
1305 .data
= &sysctl_overcommit_ratio
,
1306 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1308 .proc_handler
= overcommit_ratio_handler
,
1311 .procname
= "overcommit_kbytes",
1312 .data
= &sysctl_overcommit_kbytes
,
1313 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1315 .proc_handler
= overcommit_kbytes_handler
,
1318 .procname
= "page-cluster",
1319 .data
= &page_cluster
,
1320 .maxlen
= sizeof(int),
1322 .proc_handler
= proc_dointvec_minmax
,
1326 .procname
= "dirty_background_ratio",
1327 .data
= &dirty_background_ratio
,
1328 .maxlen
= sizeof(dirty_background_ratio
),
1330 .proc_handler
= dirty_background_ratio_handler
,
1332 .extra2
= &one_hundred
,
1335 .procname
= "dirty_background_bytes",
1336 .data
= &dirty_background_bytes
,
1337 .maxlen
= sizeof(dirty_background_bytes
),
1339 .proc_handler
= dirty_background_bytes_handler
,
1343 .procname
= "dirty_ratio",
1344 .data
= &vm_dirty_ratio
,
1345 .maxlen
= sizeof(vm_dirty_ratio
),
1347 .proc_handler
= dirty_ratio_handler
,
1349 .extra2
= &one_hundred
,
1352 .procname
= "dirty_bytes",
1353 .data
= &vm_dirty_bytes
,
1354 .maxlen
= sizeof(vm_dirty_bytes
),
1356 .proc_handler
= dirty_bytes_handler
,
1357 .extra1
= &dirty_bytes_min
,
1360 .procname
= "dirty_writeback_centisecs",
1361 .data
= &dirty_writeback_interval
,
1362 .maxlen
= sizeof(dirty_writeback_interval
),
1364 .proc_handler
= dirty_writeback_centisecs_handler
,
1367 .procname
= "dirty_expire_centisecs",
1368 .data
= &dirty_expire_interval
,
1369 .maxlen
= sizeof(dirty_expire_interval
),
1371 .proc_handler
= proc_dointvec_minmax
,
1375 .procname
= "dirtytime_expire_seconds",
1376 .data
= &dirtytime_expire_interval
,
1377 .maxlen
= sizeof(dirty_expire_interval
),
1379 .proc_handler
= dirtytime_interval_handler
,
1383 .procname
= "nr_pdflush_threads",
1384 .mode
= 0444 /* read-only */,
1385 .proc_handler
= pdflush_proc_obsolete
,
1388 .procname
= "swappiness",
1389 .data
= &vm_swappiness
,
1390 .maxlen
= sizeof(vm_swappiness
),
1392 .proc_handler
= proc_dointvec_minmax
,
1394 .extra2
= &one_hundred
,
1396 #ifdef CONFIG_HUGETLB_PAGE
1398 .procname
= "nr_hugepages",
1400 .maxlen
= sizeof(unsigned long),
1402 .proc_handler
= hugetlb_sysctl_handler
,
1406 .procname
= "nr_hugepages_mempolicy",
1408 .maxlen
= sizeof(unsigned long),
1410 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1414 .procname
= "hugetlb_shm_group",
1415 .data
= &sysctl_hugetlb_shm_group
,
1416 .maxlen
= sizeof(gid_t
),
1418 .proc_handler
= proc_dointvec
,
1421 .procname
= "hugepages_treat_as_movable",
1422 .data
= &hugepages_treat_as_movable
,
1423 .maxlen
= sizeof(int),
1425 .proc_handler
= proc_dointvec
,
1428 .procname
= "nr_overcommit_hugepages",
1430 .maxlen
= sizeof(unsigned long),
1432 .proc_handler
= hugetlb_overcommit_handler
,
1436 .procname
= "lowmem_reserve_ratio",
1437 .data
= &sysctl_lowmem_reserve_ratio
,
1438 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1440 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1443 .procname
= "drop_caches",
1444 .data
= &sysctl_drop_caches
,
1445 .maxlen
= sizeof(int),
1447 .proc_handler
= drop_caches_sysctl_handler
,
1451 #ifdef CONFIG_COMPACTION
1453 .procname
= "compact_memory",
1454 .data
= &sysctl_compact_memory
,
1455 .maxlen
= sizeof(int),
1457 .proc_handler
= sysctl_compaction_handler
,
1460 .procname
= "extfrag_threshold",
1461 .data
= &sysctl_extfrag_threshold
,
1462 .maxlen
= sizeof(int),
1464 .proc_handler
= sysctl_extfrag_handler
,
1465 .extra1
= &min_extfrag_threshold
,
1466 .extra2
= &max_extfrag_threshold
,
1469 .procname
= "compact_unevictable_allowed",
1470 .data
= &sysctl_compact_unevictable_allowed
,
1471 .maxlen
= sizeof(int),
1473 .proc_handler
= proc_dointvec
,
1478 #endif /* CONFIG_COMPACTION */
1480 .procname
= "min_free_kbytes",
1481 .data
= &min_free_kbytes
,
1482 .maxlen
= sizeof(min_free_kbytes
),
1484 .proc_handler
= min_free_kbytes_sysctl_handler
,
1488 .procname
= "percpu_pagelist_fraction",
1489 .data
= &percpu_pagelist_fraction
,
1490 .maxlen
= sizeof(percpu_pagelist_fraction
),
1492 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1497 .procname
= "max_map_count",
1498 .data
= &sysctl_max_map_count
,
1499 .maxlen
= sizeof(sysctl_max_map_count
),
1501 .proc_handler
= proc_dointvec_minmax
,
1506 .procname
= "nr_trim_pages",
1507 .data
= &sysctl_nr_trim_pages
,
1508 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1510 .proc_handler
= proc_dointvec_minmax
,
1515 .procname
= "laptop_mode",
1516 .data
= &laptop_mode
,
1517 .maxlen
= sizeof(laptop_mode
),
1519 .proc_handler
= proc_dointvec_jiffies
,
1522 .procname
= "block_dump",
1523 .data
= &block_dump
,
1524 .maxlen
= sizeof(block_dump
),
1526 .proc_handler
= proc_dointvec
,
1530 .procname
= "vfs_cache_pressure",
1531 .data
= &sysctl_vfs_cache_pressure
,
1532 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1534 .proc_handler
= proc_dointvec
,
1537 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1539 .procname
= "legacy_va_layout",
1540 .data
= &sysctl_legacy_va_layout
,
1541 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1543 .proc_handler
= proc_dointvec
,
1549 .procname
= "zone_reclaim_mode",
1550 .data
= &zone_reclaim_mode
,
1551 .maxlen
= sizeof(zone_reclaim_mode
),
1553 .proc_handler
= proc_dointvec
,
1557 .procname
= "min_unmapped_ratio",
1558 .data
= &sysctl_min_unmapped_ratio
,
1559 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1561 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1563 .extra2
= &one_hundred
,
1566 .procname
= "min_slab_ratio",
1567 .data
= &sysctl_min_slab_ratio
,
1568 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1570 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1572 .extra2
= &one_hundred
,
1577 .procname
= "stat_interval",
1578 .data
= &sysctl_stat_interval
,
1579 .maxlen
= sizeof(sysctl_stat_interval
),
1581 .proc_handler
= proc_dointvec_jiffies
,
1586 .procname
= "mmap_min_addr",
1587 .data
= &dac_mmap_min_addr
,
1588 .maxlen
= sizeof(unsigned long),
1590 .proc_handler
= mmap_min_addr_handler
,
1595 .procname
= "numa_zonelist_order",
1596 .data
= &numa_zonelist_order
,
1597 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1599 .proc_handler
= numa_zonelist_order_handler
,
1602 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1603 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1605 .procname
= "vdso_enabled",
1606 #ifdef CONFIG_X86_32
1607 .data
= &vdso32_enabled
,
1608 .maxlen
= sizeof(vdso32_enabled
),
1610 .data
= &vdso_enabled
,
1611 .maxlen
= sizeof(vdso_enabled
),
1614 .proc_handler
= proc_dointvec
,
1618 #ifdef CONFIG_HIGHMEM
1620 .procname
= "highmem_is_dirtyable",
1621 .data
= &vm_highmem_is_dirtyable
,
1622 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1624 .proc_handler
= proc_dointvec_minmax
,
1629 #ifdef CONFIG_MEMORY_FAILURE
1631 .procname
= "memory_failure_early_kill",
1632 .data
= &sysctl_memory_failure_early_kill
,
1633 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1635 .proc_handler
= proc_dointvec_minmax
,
1640 .procname
= "memory_failure_recovery",
1641 .data
= &sysctl_memory_failure_recovery
,
1642 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1644 .proc_handler
= proc_dointvec_minmax
,
1650 .procname
= "user_reserve_kbytes",
1651 .data
= &sysctl_user_reserve_kbytes
,
1652 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1654 .proc_handler
= proc_doulongvec_minmax
,
1657 .procname
= "admin_reserve_kbytes",
1658 .data
= &sysctl_admin_reserve_kbytes
,
1659 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1661 .proc_handler
= proc_doulongvec_minmax
,
1666 static struct ctl_table fs_table
[] = {
1668 .procname
= "inode-nr",
1669 .data
= &inodes_stat
,
1670 .maxlen
= 2*sizeof(long),
1672 .proc_handler
= proc_nr_inodes
,
1675 .procname
= "inode-state",
1676 .data
= &inodes_stat
,
1677 .maxlen
= 7*sizeof(long),
1679 .proc_handler
= proc_nr_inodes
,
1682 .procname
= "file-nr",
1683 .data
= &files_stat
,
1684 .maxlen
= sizeof(files_stat
),
1686 .proc_handler
= proc_nr_files
,
1689 .procname
= "file-max",
1690 .data
= &files_stat
.max_files
,
1691 .maxlen
= sizeof(files_stat
.max_files
),
1693 .proc_handler
= proc_doulongvec_minmax
,
1696 .procname
= "nr_open",
1697 .data
= &sysctl_nr_open
,
1698 .maxlen
= sizeof(int),
1700 .proc_handler
= proc_dointvec_minmax
,
1701 .extra1
= &sysctl_nr_open_min
,
1702 .extra2
= &sysctl_nr_open_max
,
1705 .procname
= "dentry-state",
1706 .data
= &dentry_stat
,
1707 .maxlen
= 6*sizeof(long),
1709 .proc_handler
= proc_nr_dentry
,
1712 .procname
= "overflowuid",
1713 .data
= &fs_overflowuid
,
1714 .maxlen
= sizeof(int),
1716 .proc_handler
= proc_dointvec_minmax
,
1717 .extra1
= &minolduid
,
1718 .extra2
= &maxolduid
,
1721 .procname
= "overflowgid",
1722 .data
= &fs_overflowgid
,
1723 .maxlen
= sizeof(int),
1725 .proc_handler
= proc_dointvec_minmax
,
1726 .extra1
= &minolduid
,
1727 .extra2
= &maxolduid
,
1729 #ifdef CONFIG_FILE_LOCKING
1731 .procname
= "leases-enable",
1732 .data
= &leases_enable
,
1733 .maxlen
= sizeof(int),
1735 .proc_handler
= proc_dointvec
,
1738 #ifdef CONFIG_DNOTIFY
1740 .procname
= "dir-notify-enable",
1741 .data
= &dir_notify_enable
,
1742 .maxlen
= sizeof(int),
1744 .proc_handler
= proc_dointvec
,
1748 #ifdef CONFIG_FILE_LOCKING
1750 .procname
= "lease-break-time",
1751 .data
= &lease_break_time
,
1752 .maxlen
= sizeof(int),
1754 .proc_handler
= proc_dointvec
,
1759 .procname
= "aio-nr",
1761 .maxlen
= sizeof(aio_nr
),
1763 .proc_handler
= proc_doulongvec_minmax
,
1766 .procname
= "aio-max-nr",
1767 .data
= &aio_max_nr
,
1768 .maxlen
= sizeof(aio_max_nr
),
1770 .proc_handler
= proc_doulongvec_minmax
,
1772 #endif /* CONFIG_AIO */
1773 #ifdef CONFIG_INOTIFY_USER
1775 .procname
= "inotify",
1777 .child
= inotify_table
,
1782 .procname
= "epoll",
1784 .child
= epoll_table
,
1789 .procname
= "protected_symlinks",
1790 .data
= &sysctl_protected_symlinks
,
1791 .maxlen
= sizeof(int),
1793 .proc_handler
= proc_dointvec_minmax
,
1798 .procname
= "protected_hardlinks",
1799 .data
= &sysctl_protected_hardlinks
,
1800 .maxlen
= sizeof(int),
1802 .proc_handler
= proc_dointvec_minmax
,
1807 .procname
= "suid_dumpable",
1808 .data
= &suid_dumpable
,
1809 .maxlen
= sizeof(int),
1811 .proc_handler
= proc_dointvec_minmax_coredump
,
1815 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1817 .procname
= "binfmt_misc",
1819 .child
= sysctl_mount_point
,
1823 .procname
= "pipe-max-size",
1824 .data
= &pipe_max_size
,
1825 .maxlen
= sizeof(int),
1827 .proc_handler
= &pipe_proc_fn
,
1828 .extra1
= &pipe_min_size
,
1831 .procname
= "pipe-user-pages-hard",
1832 .data
= &pipe_user_pages_hard
,
1833 .maxlen
= sizeof(pipe_user_pages_hard
),
1835 .proc_handler
= proc_doulongvec_minmax
,
1838 .procname
= "pipe-user-pages-soft",
1839 .data
= &pipe_user_pages_soft
,
1840 .maxlen
= sizeof(pipe_user_pages_soft
),
1842 .proc_handler
= proc_doulongvec_minmax
,
1845 .procname
= "mount-max",
1846 .data
= &sysctl_mount_max
,
1847 .maxlen
= sizeof(unsigned int),
1849 .proc_handler
= proc_dointvec_minmax
,
1855 static struct ctl_table debug_table
[] = {
1856 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1858 .procname
= "exception-trace",
1859 .data
= &show_unhandled_signals
,
1860 .maxlen
= sizeof(int),
1862 .proc_handler
= proc_dointvec
1865 #if defined(CONFIG_OPTPROBES)
1867 .procname
= "kprobes-optimization",
1868 .data
= &sysctl_kprobes_optimization
,
1869 .maxlen
= sizeof(int),
1871 .proc_handler
= proc_kprobes_optimization_handler
,
1879 static struct ctl_table dev_table
[] = {
1883 int __init
sysctl_init(void)
1885 struct ctl_table_header
*hdr
;
1887 hdr
= register_sysctl_table(sysctl_base_table
);
1888 kmemleak_not_leak(hdr
);
1892 #endif /* CONFIG_SYSCTL */
1898 #ifdef CONFIG_PROC_SYSCTL
1900 static int _proc_do_string(char *data
, int maxlen
, int write
,
1901 char __user
*buffer
,
1902 size_t *lenp
, loff_t
*ppos
)
1908 if (!data
|| !maxlen
|| !*lenp
) {
1914 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
1915 /* Only continue writes not past the end of buffer. */
1917 if (len
> maxlen
- 1)
1924 /* Start writing from beginning of buffer. */
1930 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
1931 if (get_user(c
, p
++))
1933 if (c
== 0 || c
== '\n')
1954 if (copy_to_user(buffer
, data
, len
))
1957 if (put_user('\n', buffer
+ len
))
1967 static void warn_sysctl_write(struct ctl_table
*table
)
1969 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1970 "This will not be supported in the future. To silence this\n"
1971 "warning, set kernel.sysctl_writes_strict = -1\n",
1972 current
->comm
, table
->procname
);
1976 * proc_dostring - read a string sysctl
1977 * @table: the sysctl table
1978 * @write: %TRUE if this is a write to the sysctl file
1979 * @buffer: the user buffer
1980 * @lenp: the size of the user buffer
1981 * @ppos: file position
1983 * Reads/writes a string from/to the user buffer. If the kernel
1984 * buffer provided is not large enough to hold the string, the
1985 * string is truncated. The copied string is %NULL-terminated.
1986 * If the string is being read by the user process, it is copied
1987 * and a newline '\n' is added. It is truncated if the buffer is
1990 * Returns 0 on success.
1992 int proc_dostring(struct ctl_table
*table
, int write
,
1993 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1995 if (write
&& *ppos
&& sysctl_writes_strict
== SYSCTL_WRITES_WARN
)
1996 warn_sysctl_write(table
);
1998 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
1999 (char __user
*)buffer
, lenp
, ppos
);
2002 static size_t proc_skip_spaces(char **buf
)
2005 char *tmp
= skip_spaces(*buf
);
2011 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2021 #define TMPBUFLEN 22
2023 * proc_get_long - reads an ASCII formatted integer from a user buffer
2025 * @buf: a kernel buffer
2026 * @size: size of the kernel buffer
2027 * @val: this is where the number will be stored
2028 * @neg: set to %TRUE if number is negative
2029 * @perm_tr: a vector which contains the allowed trailers
2030 * @perm_tr_len: size of the perm_tr vector
2031 * @tr: pointer to store the trailer character
2033 * In case of success %0 is returned and @buf and @size are updated with
2034 * the amount of bytes read. If @tr is non-NULL and a trailing
2035 * character exists (size is non-zero after returning from this
2036 * function), @tr is updated with the trailing character.
2038 static int proc_get_long(char **buf
, size_t *size
,
2039 unsigned long *val
, bool *neg
,
2040 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2043 char *p
, tmp
[TMPBUFLEN
];
2049 if (len
> TMPBUFLEN
- 1)
2050 len
= TMPBUFLEN
- 1;
2052 memcpy(tmp
, *buf
, len
);
2056 if (*p
== '-' && *size
> 1) {
2064 *val
= simple_strtoul(p
, &p
, 0);
2068 /* We don't know if the next char is whitespace thus we may accept
2069 * invalid integers (e.g. 1234...a) or two integers instead of one
2070 * (e.g. 123...1). So lets not allow such large numbers. */
2071 if (len
== TMPBUFLEN
- 1)
2074 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2077 if (tr
&& (len
< *size
))
2087 * proc_put_long - converts an integer to a decimal ASCII formatted string
2089 * @buf: the user buffer
2090 * @size: the size of the user buffer
2091 * @val: the integer to be converted
2092 * @neg: sign of the number, %TRUE for negative
2094 * In case of success %0 is returned and @buf and @size are updated with
2095 * the amount of bytes written.
2097 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2101 char tmp
[TMPBUFLEN
], *p
= tmp
;
2103 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2107 if (copy_to_user(*buf
, tmp
, len
))
2115 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2118 char __user
**buffer
= (char __user
**)buf
;
2119 if (put_user(c
, *buffer
))
2121 (*size
)--, (*buffer
)++;
2127 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2129 int write
, void *data
)
2133 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2137 if (*lvalp
> (unsigned long) INT_MAX
)
2145 *lvalp
= -(unsigned long)val
;
2148 *lvalp
= (unsigned long)val
;
2154 static int do_proc_douintvec_conv(bool *negp
, unsigned long *lvalp
,
2156 int write
, void *data
)
2161 if (*lvalp
> UINT_MAX
)
2165 unsigned int val
= *valp
;
2167 *lvalp
= (unsigned long)val
;
2172 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2174 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2175 int write
, void __user
*buffer
,
2176 size_t *lenp
, loff_t
*ppos
,
2177 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2178 int write
, void *data
),
2181 int *i
, vleft
, first
= 1, err
= 0;
2182 unsigned long page
= 0;
2186 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2191 i
= (int *) tbl_data
;
2192 vleft
= table
->maxlen
/ sizeof(*i
);
2196 conv
= do_proc_dointvec_conv
;
2200 switch (sysctl_writes_strict
) {
2201 case SYSCTL_WRITES_STRICT
:
2203 case SYSCTL_WRITES_WARN
:
2204 warn_sysctl_write(table
);
2211 if (left
> PAGE_SIZE
- 1)
2212 left
= PAGE_SIZE
- 1;
2213 page
= __get_free_page(GFP_TEMPORARY
);
2214 kbuf
= (char *) page
;
2217 if (copy_from_user(kbuf
, buffer
, left
)) {
2224 for (; left
&& vleft
--; i
++, first
=0) {
2229 left
-= proc_skip_spaces(&kbuf
);
2233 err
= proc_get_long(&kbuf
, &left
, &lval
, &neg
,
2235 sizeof(proc_wspace_sep
), NULL
);
2238 if (conv(&neg
, &lval
, i
, 1, data
)) {
2243 if (conv(&neg
, &lval
, i
, 0, data
)) {
2248 err
= proc_put_char(&buffer
, &left
, '\t');
2251 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2257 if (!write
&& !first
&& left
&& !err
)
2258 err
= proc_put_char(&buffer
, &left
, '\n');
2259 if (write
&& !err
&& left
)
2260 left
-= proc_skip_spaces(&kbuf
);
2265 return err
? : -EINVAL
;
2273 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2274 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2275 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2276 int write
, void *data
),
2279 return __do_proc_dointvec(table
->data
, table
, write
,
2280 buffer
, lenp
, ppos
, conv
, data
);
2284 * proc_dointvec - read a vector of integers
2285 * @table: the sysctl table
2286 * @write: %TRUE if this is a write to the sysctl file
2287 * @buffer: the user buffer
2288 * @lenp: the size of the user buffer
2289 * @ppos: file position
2291 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2292 * values from/to the user buffer, treated as an ASCII string.
2294 * Returns 0 on success.
2296 int proc_dointvec(struct ctl_table
*table
, int write
,
2297 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2299 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2303 * proc_douintvec - read a vector of unsigned integers
2304 * @table: the sysctl table
2305 * @write: %TRUE if this is a write to the sysctl file
2306 * @buffer: the user buffer
2307 * @lenp: the size of the user buffer
2308 * @ppos: file position
2310 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2311 * values from/to the user buffer, treated as an ASCII string.
2313 * Returns 0 on success.
2315 int proc_douintvec(struct ctl_table
*table
, int write
,
2316 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2318 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2319 do_proc_douintvec_conv
, NULL
);
2323 * Taint values can only be increased
2324 * This means we can safely use a temporary.
2326 static int proc_taint(struct ctl_table
*table
, int write
,
2327 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2330 unsigned long tmptaint
= get_taint();
2333 if (write
&& !capable(CAP_SYS_ADMIN
))
2338 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2344 * Poor man's atomic or. Not worth adding a primitive
2345 * to everyone's atomic.h for this
2348 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2349 if ((tmptaint
>> i
) & 1)
2350 add_taint(i
, LOCKDEP_STILL_OK
);
2357 #ifdef CONFIG_PRINTK
2358 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2359 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2361 if (write
&& !capable(CAP_SYS_ADMIN
))
2364 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2368 struct do_proc_dointvec_minmax_conv_param
{
2373 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2375 int write
, void *data
)
2377 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2379 int val
= *negp
? -*lvalp
: *lvalp
;
2380 if ((param
->min
&& *param
->min
> val
) ||
2381 (param
->max
&& *param
->max
< val
))
2388 *lvalp
= -(unsigned long)val
;
2391 *lvalp
= (unsigned long)val
;
2398 * proc_dointvec_minmax - read a vector of integers with min/max values
2399 * @table: the sysctl table
2400 * @write: %TRUE if this is a write to the sysctl file
2401 * @buffer: the user buffer
2402 * @lenp: the size of the user buffer
2403 * @ppos: file position
2405 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2406 * values from/to the user buffer, treated as an ASCII string.
2408 * This routine will ensure the values are within the range specified by
2409 * table->extra1 (min) and table->extra2 (max).
2411 * Returns 0 on success.
2413 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2414 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2416 struct do_proc_dointvec_minmax_conv_param param
= {
2417 .min
= (int *) table
->extra1
,
2418 .max
= (int *) table
->extra2
,
2420 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2421 do_proc_dointvec_minmax_conv
, ¶m
);
2425 int proc_dointvec_ibrs_dump(struct ctl_table
*table
, int write
,
2426 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2428 int ret
, orig_inuse
;
2432 ret
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2433 printk("sysctl_ibrs_enabled = %u, sysctl_ibpb_enabled = %u\n", sysctl_ibrs_enabled
, sysctl_ibpb_enabled
);
2434 printk("use_ibrs = %d, use_ibpb = %d\n", use_ibrs
, use_ibpb
);
2435 mutex_lock(&spec_ctrl_mutex
);
2436 orig_inuse
= use_ibrs
;
2437 /* temporary halt to ibrs usage to dump ibrs values */
2439 for_each_online_cpu(cpu
) {
2442 if (boot_cpu_has(X86_FEATURE_SPEC_CTRL
))
2443 rdmsrl_on_cpu(cpu
, MSR_IA32_SPEC_CTRL
, &val
);
2446 printk("read cpu %d ibrs val %lu\n", cpu
, (unsigned long) val
);
2448 use_ibrs
= orig_inuse
;
2449 mutex_unlock(&spec_ctrl_mutex
);
2453 int proc_dointvec_ibrs_ctrl(struct ctl_table
*table
, int write
,
2454 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2459 ret
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2460 pr_debug("sysctl_ibrs_enabled = %u, sysctl_ibpb_enabled = %u\n", sysctl_ibrs_enabled
, sysctl_ibpb_enabled
);
2461 pr_debug("before:use_ibrs = %d, use_ibpb = %d\n", use_ibrs
, use_ibpb
);
2462 mutex_lock(&spec_ctrl_mutex
);
2463 if (sysctl_ibrs_enabled
== 0) {
2464 /* always set IBRS off */
2465 set_ibrs_disabled();
2466 if (ibrs_supported
) {
2467 for_each_online_cpu(cpu
)
2468 wrmsrl_on_cpu(cpu
, MSR_IA32_SPEC_CTRL
, 0x0);
2470 } else if (sysctl_ibrs_enabled
== 2) {
2471 /* always set IBRS on, even in user space */
2472 clear_ibrs_disabled();
2473 if (ibrs_supported
) {
2474 for_each_online_cpu(cpu
)
2475 wrmsrl_on_cpu(cpu
, MSR_IA32_SPEC_CTRL
, FEATURE_ENABLE_IBRS
);
2477 sysctl_ibrs_enabled
= 0;
2479 } else if (sysctl_ibrs_enabled
== 1) {
2480 /* use IBRS in kernel */
2481 clear_ibrs_disabled();
2483 /* platform don't support ibrs */
2484 sysctl_ibrs_enabled
= 0;
2486 mutex_unlock(&spec_ctrl_mutex
);
2487 pr_debug("after:use_ibrs = %d, use_ibpb = %d\n", use_ibrs
, use_ibpb
);
2491 int proc_dointvec_ibpb_ctrl(struct ctl_table
*table
, int write
,
2492 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2496 ret
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2497 pr_debug("sysctl_ibrs_enabled = %u, sysctl_ibpb_enabled = %u\n", sysctl_ibrs_enabled
, sysctl_ibpb_enabled
);
2498 pr_debug("before:use_ibrs = %d, use_ibpb = %d\n", use_ibrs
, use_ibpb
);
2499 mutex_lock(&spec_ctrl_mutex
);
2500 if (sysctl_ibpb_enabled
== 0)
2501 set_ibpb_disabled();
2502 else if (sysctl_ibpb_enabled
== 1) {
2503 clear_ibpb_disabled();
2505 /* platform don't support ibpb */
2506 sysctl_ibpb_enabled
= 0;
2508 mutex_unlock(&spec_ctrl_mutex
);
2509 pr_debug("after:use_ibrs = %d, use_ibpb = %d\n", use_ibrs
, use_ibpb
);
2514 static void validate_coredump_safety(void)
2516 #ifdef CONFIG_COREDUMP
2517 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2518 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2519 printk(KERN_WARNING
"Unsafe core_pattern used with "\
2520 "suid_dumpable=2. Pipe handler or fully qualified "\
2521 "core dump path required.\n");
2526 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2527 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2529 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2531 validate_coredump_safety();
2535 #ifdef CONFIG_COREDUMP
2536 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2537 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2539 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2541 validate_coredump_safety();
2546 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2547 void __user
*buffer
,
2548 size_t *lenp
, loff_t
*ppos
,
2549 unsigned long convmul
,
2550 unsigned long convdiv
)
2552 unsigned long *i
, *min
, *max
;
2553 int vleft
, first
= 1, err
= 0;
2554 unsigned long page
= 0;
2558 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2563 i
= (unsigned long *) data
;
2564 min
= (unsigned long *) table
->extra1
;
2565 max
= (unsigned long *) table
->extra2
;
2566 vleft
= table
->maxlen
/ sizeof(unsigned long);
2571 switch (sysctl_writes_strict
) {
2572 case SYSCTL_WRITES_STRICT
:
2574 case SYSCTL_WRITES_WARN
:
2575 warn_sysctl_write(table
);
2582 if (left
> PAGE_SIZE
- 1)
2583 left
= PAGE_SIZE
- 1;
2584 page
= __get_free_page(GFP_TEMPORARY
);
2585 kbuf
= (char *) page
;
2588 if (copy_from_user(kbuf
, buffer
, left
)) {
2595 for (; left
&& vleft
--; i
++, first
= 0) {
2601 left
-= proc_skip_spaces(&kbuf
);
2603 err
= proc_get_long(&kbuf
, &left
, &val
, &neg
,
2605 sizeof(proc_wspace_sep
), NULL
);
2610 val
= convmul
* val
/ convdiv
;
2611 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2615 val
= convdiv
* (*i
) / convmul
;
2617 err
= proc_put_char(&buffer
, &left
, '\t');
2621 err
= proc_put_long(&buffer
, &left
, val
, false);
2627 if (!write
&& !first
&& left
&& !err
)
2628 err
= proc_put_char(&buffer
, &left
, '\n');
2630 left
-= proc_skip_spaces(&kbuf
);
2635 return err
? : -EINVAL
;
2643 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2644 void __user
*buffer
,
2645 size_t *lenp
, loff_t
*ppos
,
2646 unsigned long convmul
,
2647 unsigned long convdiv
)
2649 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2650 buffer
, lenp
, ppos
, convmul
, convdiv
);
2654 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2655 * @table: the sysctl table
2656 * @write: %TRUE if this is a write to the sysctl file
2657 * @buffer: the user buffer
2658 * @lenp: the size of the user buffer
2659 * @ppos: file position
2661 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2662 * values from/to the user buffer, treated as an ASCII string.
2664 * This routine will ensure the values are within the range specified by
2665 * table->extra1 (min) and table->extra2 (max).
2667 * Returns 0 on success.
2669 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2670 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2672 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2676 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2677 * @table: the sysctl table
2678 * @write: %TRUE if this is a write to the sysctl file
2679 * @buffer: the user buffer
2680 * @lenp: the size of the user buffer
2681 * @ppos: file position
2683 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2684 * values from/to the user buffer, treated as an ASCII string. The values
2685 * are treated as milliseconds, and converted to jiffies when they are stored.
2687 * This routine will ensure the values are within the range specified by
2688 * table->extra1 (min) and table->extra2 (max).
2690 * Returns 0 on success.
2692 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2693 void __user
*buffer
,
2694 size_t *lenp
, loff_t
*ppos
)
2696 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2697 lenp
, ppos
, HZ
, 1000l);
2701 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2703 int write
, void *data
)
2706 if (*lvalp
> LONG_MAX
/ HZ
)
2708 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2714 lval
= -(unsigned long)val
;
2717 lval
= (unsigned long)val
;
2724 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2726 int write
, void *data
)
2729 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2731 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2737 lval
= -(unsigned long)val
;
2740 lval
= (unsigned long)val
;
2742 *lvalp
= jiffies_to_clock_t(lval
);
2747 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2749 int write
, void *data
)
2752 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2762 lval
= -(unsigned long)val
;
2765 lval
= (unsigned long)val
;
2767 *lvalp
= jiffies_to_msecs(lval
);
2773 * proc_dointvec_jiffies - read a vector of integers as seconds
2774 * @table: the sysctl table
2775 * @write: %TRUE if this is a write to the sysctl file
2776 * @buffer: the user buffer
2777 * @lenp: the size of the user buffer
2778 * @ppos: file position
2780 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2781 * values from/to the user buffer, treated as an ASCII string.
2782 * The values read are assumed to be in seconds, and are converted into
2785 * Returns 0 on success.
2787 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
2788 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2790 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2791 do_proc_dointvec_jiffies_conv
,NULL
);
2795 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2796 * @table: the sysctl table
2797 * @write: %TRUE if this is a write to the sysctl file
2798 * @buffer: the user buffer
2799 * @lenp: the size of the user buffer
2800 * @ppos: pointer to the file position
2802 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2803 * values from/to the user buffer, treated as an ASCII string.
2804 * The values read are assumed to be in 1/USER_HZ seconds, and
2805 * are converted into jiffies.
2807 * Returns 0 on success.
2809 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
2810 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2812 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
2813 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2817 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2818 * @table: the sysctl table
2819 * @write: %TRUE if this is a write to the sysctl file
2820 * @buffer: the user buffer
2821 * @lenp: the size of the user buffer
2822 * @ppos: file position
2823 * @ppos: the current position in the file
2825 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2826 * values from/to the user buffer, treated as an ASCII string.
2827 * The values read are assumed to be in 1/1000 seconds, and
2828 * are converted into jiffies.
2830 * Returns 0 on success.
2832 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
2833 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2835 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2836 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2839 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
2840 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2842 struct pid
*new_pid
;
2846 tmp
= pid_vnr(cad_pid
);
2848 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
2849 lenp
, ppos
, NULL
, NULL
);
2853 new_pid
= find_get_pid(tmp
);
2857 put_pid(xchg(&cad_pid
, new_pid
));
2862 * proc_do_large_bitmap - read/write from/to a large bitmap
2863 * @table: the sysctl table
2864 * @write: %TRUE if this is a write to the sysctl file
2865 * @buffer: the user buffer
2866 * @lenp: the size of the user buffer
2867 * @ppos: file position
2869 * The bitmap is stored at table->data and the bitmap length (in bits)
2872 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2873 * large bitmaps may be represented in a compact manner. Writing into
2874 * the file will clear the bitmap then update it with the given input.
2876 * Returns 0 on success.
2878 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
2879 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2883 size_t left
= *lenp
;
2884 unsigned long bitmap_len
= table
->maxlen
;
2885 unsigned long *bitmap
= *(unsigned long **) table
->data
;
2886 unsigned long *tmp_bitmap
= NULL
;
2887 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
2889 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
2895 unsigned long page
= 0;
2898 if (left
> PAGE_SIZE
- 1)
2899 left
= PAGE_SIZE
- 1;
2901 page
= __get_free_page(GFP_TEMPORARY
);
2902 kbuf
= (char *) page
;
2905 if (copy_from_user(kbuf
, buffer
, left
)) {
2911 tmp_bitmap
= kzalloc(BITS_TO_LONGS(bitmap_len
) * sizeof(unsigned long),
2917 proc_skip_char(&kbuf
, &left
, '\n');
2918 while (!err
&& left
) {
2919 unsigned long val_a
, val_b
;
2922 err
= proc_get_long(&kbuf
, &left
, &val_a
, &neg
, tr_a
,
2926 if (val_a
>= bitmap_len
|| neg
) {
2938 err
= proc_get_long(&kbuf
, &left
, &val_b
,
2939 &neg
, tr_b
, sizeof(tr_b
),
2943 if (val_b
>= bitmap_len
|| neg
||
2954 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
2956 proc_skip_char(&kbuf
, &left
, '\n');
2960 unsigned long bit_a
, bit_b
= 0;
2963 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
2964 if (bit_a
>= bitmap_len
)
2966 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
2970 err
= proc_put_char(&buffer
, &left
, ',');
2974 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
2977 if (bit_a
!= bit_b
) {
2978 err
= proc_put_char(&buffer
, &left
, '-');
2981 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
2989 err
= proc_put_char(&buffer
, &left
, '\n');
2995 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
2997 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3009 #else /* CONFIG_PROC_SYSCTL */
3011 int proc_dostring(struct ctl_table
*table
, int write
,
3012 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3017 int proc_dointvec(struct ctl_table
*table
, int write
,
3018 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3023 int proc_douintvec(struct ctl_table
*table
, int write
,
3024 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3029 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3030 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3035 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3036 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3041 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3042 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3047 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3048 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3053 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3054 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3059 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3060 void __user
*buffer
,
3061 size_t *lenp
, loff_t
*ppos
)
3067 #endif /* CONFIG_PROC_SYSCTL */
3070 * No sense putting this after each symbol definition, twice,
3071 * exception granted :-)
3073 EXPORT_SYMBOL(proc_dointvec
);
3074 EXPORT_SYMBOL(proc_douintvec
);
3075 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3076 EXPORT_SYMBOL(proc_dointvec_minmax
);
3077 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3078 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3079 EXPORT_SYMBOL(proc_dostring
);
3080 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3081 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);