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/userfaultfd_k.h>
71 #include "../lib/kstrtox.h"
73 #include <linux/uaccess.h>
74 #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
96 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
97 #include <linux/stackleak.h>
99 #ifdef CONFIG_LOCKUP_DETECTOR
100 #include <linux/nmi.h>
103 #if defined(CONFIG_SYSCTL)
105 /* External variables not in a header file. */
106 extern int suid_dumpable
;
107 #ifdef CONFIG_COREDUMP
108 extern int core_uses_pid
;
109 extern char core_pattern
[];
110 extern unsigned int core_pipe_limit
;
113 extern int pid_max_min
, pid_max_max
;
114 extern int percpu_pagelist_fraction
;
115 extern int latencytop_enabled
;
116 extern unsigned int sysctl_nr_open_min
, sysctl_nr_open_max
;
118 extern int sysctl_nr_trim_pages
;
121 /* Constants used for minimum and maximum */
122 #ifdef CONFIG_LOCKUP_DETECTOR
123 static int sixty
= 60;
126 static int __maybe_unused neg_one
= -1;
129 static int __maybe_unused one
= 1;
130 static int __maybe_unused two
= 2;
131 static int __maybe_unused four
= 4;
132 static unsigned long zero_ul
;
133 static unsigned long one_ul
= 1;
134 static unsigned long long_max
= LONG_MAX
;
135 static int one_hundred
= 100;
136 static int one_thousand
= 1000;
138 static int ten_thousand
= 10000;
140 #ifdef CONFIG_PERF_EVENTS
141 static int six_hundred_forty_kb
= 640 * 1024;
144 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
145 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
147 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
148 static int maxolduid
= 65535;
149 static int minolduid
;
151 static int ngroups_max
= NGROUPS_MAX
;
152 static const int cap_last_cap
= CAP_LAST_CAP
;
155 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
156 * and hung_task_check_interval_secs
158 #ifdef CONFIG_DETECT_HUNG_TASK
159 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
162 #ifdef CONFIG_INOTIFY_USER
163 #include <linux/inotify.h>
169 extern int pwrsw_enabled
;
172 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
173 extern int unaligned_enabled
;
177 extern int unaligned_dump_stack
;
180 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
181 extern int no_unaligned_warning
;
184 #ifdef CONFIG_PROC_SYSCTL
187 * enum sysctl_writes_mode - supported sysctl write modes
189 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
190 * to be written, and multiple writes on the same sysctl file descriptor
191 * will rewrite the sysctl value, regardless of file position. No warning
192 * is issued when the initial position is not 0.
193 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
195 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
196 * file position 0 and the value must be fully contained in the buffer
197 * sent to the write syscall. If dealing with strings respect the file
198 * position, but restrict this to the max length of the buffer, anything
199 * passed the max lenght will be ignored. Multiple writes will append
202 * These write modes control how current file position affects the behavior of
203 * updating sysctl values through the proc interface on each write.
205 enum sysctl_writes_mode
{
206 SYSCTL_WRITES_LEGACY
= -1,
207 SYSCTL_WRITES_WARN
= 0,
208 SYSCTL_WRITES_STRICT
= 1,
211 static enum sysctl_writes_mode sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
213 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
214 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
215 static int proc_taint(struct ctl_table
*table
, int write
,
216 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
220 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
221 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
224 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
225 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
226 #ifdef CONFIG_COREDUMP
227 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
228 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
230 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
231 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
232 #ifdef CONFIG_BPF_SYSCALL
233 static int proc_dointvec_minmax_bpf_stats(struct ctl_table
*table
, int write
,
234 void __user
*buffer
, size_t *lenp
,
238 #ifdef CONFIG_MAGIC_SYSRQ
239 /* Note: sysrq code uses its own private copy */
240 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
242 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
243 void __user
*buffer
, size_t *lenp
,
248 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
253 sysrq_toggle_support(__sysrq_enabled
);
260 static struct ctl_table kern_table
[];
261 static struct ctl_table vm_table
[];
262 static struct ctl_table fs_table
[];
263 static struct ctl_table debug_table
[];
264 static struct ctl_table dev_table
[];
265 extern struct ctl_table random_table
[];
267 extern struct ctl_table epoll_table
[];
270 #ifdef CONFIG_FW_LOADER_USER_HELPER
271 extern struct ctl_table firmware_config_table
[];
274 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
275 int sysctl_legacy_va_layout
;
278 /* The default sysctl tables: */
280 static struct ctl_table sysctl_base_table
[] = {
282 .procname
= "kernel",
299 .child
= debug_table
,
309 #ifdef CONFIG_SCHED_DEBUG
310 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
311 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
312 static int min_wakeup_granularity_ns
; /* 0 usecs */
313 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
315 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
316 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
317 #endif /* CONFIG_SMP */
318 #endif /* CONFIG_SCHED_DEBUG */
320 #ifdef CONFIG_COMPACTION
321 static int min_extfrag_threshold
;
322 static int max_extfrag_threshold
= 1000;
325 static struct ctl_table kern_table
[] = {
327 .procname
= "sched_child_runs_first",
328 .data
= &sysctl_sched_child_runs_first
,
329 .maxlen
= sizeof(unsigned int),
331 .proc_handler
= proc_dointvec
,
333 #ifdef CONFIG_SCHED_DEBUG
335 .procname
= "sched_min_granularity_ns",
336 .data
= &sysctl_sched_min_granularity
,
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_latency_ns",
345 .data
= &sysctl_sched_latency
,
346 .maxlen
= sizeof(unsigned int),
348 .proc_handler
= sched_proc_update_handler
,
349 .extra1
= &min_sched_granularity_ns
,
350 .extra2
= &max_sched_granularity_ns
,
353 .procname
= "sched_wakeup_granularity_ns",
354 .data
= &sysctl_sched_wakeup_granularity
,
355 .maxlen
= sizeof(unsigned int),
357 .proc_handler
= sched_proc_update_handler
,
358 .extra1
= &min_wakeup_granularity_ns
,
359 .extra2
= &max_wakeup_granularity_ns
,
363 .procname
= "sched_tunable_scaling",
364 .data
= &sysctl_sched_tunable_scaling
,
365 .maxlen
= sizeof(enum sched_tunable_scaling
),
367 .proc_handler
= sched_proc_update_handler
,
368 .extra1
= &min_sched_tunable_scaling
,
369 .extra2
= &max_sched_tunable_scaling
,
372 .procname
= "sched_migration_cost_ns",
373 .data
= &sysctl_sched_migration_cost
,
374 .maxlen
= sizeof(unsigned int),
376 .proc_handler
= proc_dointvec
,
379 .procname
= "sched_nr_migrate",
380 .data
= &sysctl_sched_nr_migrate
,
381 .maxlen
= sizeof(unsigned int),
383 .proc_handler
= proc_dointvec
,
385 #ifdef CONFIG_SCHEDSTATS
387 .procname
= "sched_schedstats",
389 .maxlen
= sizeof(unsigned int),
391 .proc_handler
= sysctl_schedstats
,
395 #endif /* CONFIG_SCHEDSTATS */
396 #endif /* CONFIG_SMP */
397 #ifdef CONFIG_NUMA_BALANCING
399 .procname
= "numa_balancing_scan_delay_ms",
400 .data
= &sysctl_numa_balancing_scan_delay
,
401 .maxlen
= sizeof(unsigned int),
403 .proc_handler
= proc_dointvec
,
406 .procname
= "numa_balancing_scan_period_min_ms",
407 .data
= &sysctl_numa_balancing_scan_period_min
,
408 .maxlen
= sizeof(unsigned int),
410 .proc_handler
= proc_dointvec
,
413 .procname
= "numa_balancing_scan_period_max_ms",
414 .data
= &sysctl_numa_balancing_scan_period_max
,
415 .maxlen
= sizeof(unsigned int),
417 .proc_handler
= proc_dointvec
,
420 .procname
= "numa_balancing_scan_size_mb",
421 .data
= &sysctl_numa_balancing_scan_size
,
422 .maxlen
= sizeof(unsigned int),
424 .proc_handler
= proc_dointvec_minmax
,
428 .procname
= "numa_balancing",
429 .data
= NULL
, /* filled in by handler */
430 .maxlen
= sizeof(unsigned int),
432 .proc_handler
= sysctl_numa_balancing
,
436 #endif /* CONFIG_NUMA_BALANCING */
437 #endif /* CONFIG_SCHED_DEBUG */
439 .procname
= "sched_rt_period_us",
440 .data
= &sysctl_sched_rt_period
,
441 .maxlen
= sizeof(unsigned int),
443 .proc_handler
= sched_rt_handler
,
446 .procname
= "sched_rt_runtime_us",
447 .data
= &sysctl_sched_rt_runtime
,
448 .maxlen
= sizeof(int),
450 .proc_handler
= sched_rt_handler
,
453 .procname
= "sched_rr_timeslice_ms",
454 .data
= &sysctl_sched_rr_timeslice
,
455 .maxlen
= sizeof(int),
457 .proc_handler
= sched_rr_handler
,
459 #ifdef CONFIG_SCHED_AUTOGROUP
461 .procname
= "sched_autogroup_enabled",
462 .data
= &sysctl_sched_autogroup_enabled
,
463 .maxlen
= sizeof(unsigned int),
465 .proc_handler
= proc_dointvec_minmax
,
470 #ifdef CONFIG_CFS_BANDWIDTH
472 .procname
= "sched_cfs_bandwidth_slice_us",
473 .data
= &sysctl_sched_cfs_bandwidth_slice
,
474 .maxlen
= sizeof(unsigned int),
476 .proc_handler
= proc_dointvec_minmax
,
480 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
482 .procname
= "sched_energy_aware",
483 .data
= &sysctl_sched_energy_aware
,
484 .maxlen
= sizeof(unsigned int),
486 .proc_handler
= sched_energy_aware_handler
,
491 #ifdef CONFIG_PROVE_LOCKING
493 .procname
= "prove_locking",
494 .data
= &prove_locking
,
495 .maxlen
= sizeof(int),
497 .proc_handler
= proc_dointvec
,
500 #ifdef CONFIG_LOCK_STAT
502 .procname
= "lock_stat",
504 .maxlen
= sizeof(int),
506 .proc_handler
= proc_dointvec
,
511 .data
= &panic_timeout
,
512 .maxlen
= sizeof(int),
514 .proc_handler
= proc_dointvec
,
516 #ifdef CONFIG_COREDUMP
518 .procname
= "core_uses_pid",
519 .data
= &core_uses_pid
,
520 .maxlen
= sizeof(int),
522 .proc_handler
= proc_dointvec
,
525 .procname
= "core_pattern",
526 .data
= core_pattern
,
527 .maxlen
= CORENAME_MAX_SIZE
,
529 .proc_handler
= proc_dostring_coredump
,
532 .procname
= "core_pipe_limit",
533 .data
= &core_pipe_limit
,
534 .maxlen
= sizeof(unsigned int),
536 .proc_handler
= proc_dointvec
,
539 #ifdef CONFIG_PROC_SYSCTL
541 .procname
= "tainted",
542 .maxlen
= sizeof(long),
544 .proc_handler
= proc_taint
,
547 .procname
= "sysctl_writes_strict",
548 .data
= &sysctl_writes_strict
,
549 .maxlen
= sizeof(int),
551 .proc_handler
= proc_dointvec_minmax
,
556 #ifdef CONFIG_LATENCYTOP
558 .procname
= "latencytop",
559 .data
= &latencytop_enabled
,
560 .maxlen
= sizeof(int),
562 .proc_handler
= sysctl_latencytop
,
565 #ifdef CONFIG_BLK_DEV_INITRD
567 .procname
= "real-root-dev",
568 .data
= &real_root_dev
,
569 .maxlen
= sizeof(int),
571 .proc_handler
= proc_dointvec
,
575 .procname
= "print-fatal-signals",
576 .data
= &print_fatal_signals
,
577 .maxlen
= sizeof(int),
579 .proc_handler
= proc_dointvec
,
583 .procname
= "reboot-cmd",
584 .data
= reboot_command
,
587 .proc_handler
= proc_dostring
,
590 .procname
= "stop-a",
591 .data
= &stop_a_enabled
,
592 .maxlen
= sizeof (int),
594 .proc_handler
= proc_dointvec
,
597 .procname
= "scons-poweroff",
598 .data
= &scons_pwroff
,
599 .maxlen
= sizeof (int),
601 .proc_handler
= proc_dointvec
,
604 #ifdef CONFIG_SPARC64
606 .procname
= "tsb-ratio",
607 .data
= &sysctl_tsb_ratio
,
608 .maxlen
= sizeof (int),
610 .proc_handler
= proc_dointvec
,
615 .procname
= "soft-power",
616 .data
= &pwrsw_enabled
,
617 .maxlen
= sizeof (int),
619 .proc_handler
= proc_dointvec
,
622 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
624 .procname
= "unaligned-trap",
625 .data
= &unaligned_enabled
,
626 .maxlen
= sizeof (int),
628 .proc_handler
= proc_dointvec
,
632 .procname
= "ctrl-alt-del",
634 .maxlen
= sizeof(int),
636 .proc_handler
= proc_dointvec
,
638 #ifdef CONFIG_FUNCTION_TRACER
640 .procname
= "ftrace_enabled",
641 .data
= &ftrace_enabled
,
642 .maxlen
= sizeof(int),
644 .proc_handler
= ftrace_enable_sysctl
,
647 #ifdef CONFIG_STACK_TRACER
649 .procname
= "stack_tracer_enabled",
650 .data
= &stack_tracer_enabled
,
651 .maxlen
= sizeof(int),
653 .proc_handler
= stack_trace_sysctl
,
656 #ifdef CONFIG_TRACING
658 .procname
= "ftrace_dump_on_oops",
659 .data
= &ftrace_dump_on_oops
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= proc_dointvec
,
665 .procname
= "traceoff_on_warning",
666 .data
= &__disable_trace_on_warning
,
667 .maxlen
= sizeof(__disable_trace_on_warning
),
669 .proc_handler
= proc_dointvec
,
672 .procname
= "tracepoint_printk",
673 .data
= &tracepoint_printk
,
674 .maxlen
= sizeof(tracepoint_printk
),
676 .proc_handler
= tracepoint_printk_sysctl
,
679 #ifdef CONFIG_KEXEC_CORE
681 .procname
= "kexec_load_disabled",
682 .data
= &kexec_load_disabled
,
683 .maxlen
= sizeof(int),
685 /* only handle a transition from default "0" to "1" */
686 .proc_handler
= proc_dointvec_minmax
,
691 #ifdef CONFIG_MODULES
693 .procname
= "modprobe",
694 .data
= &modprobe_path
,
695 .maxlen
= KMOD_PATH_LEN
,
697 .proc_handler
= proc_dostring
,
700 .procname
= "modules_disabled",
701 .data
= &modules_disabled
,
702 .maxlen
= sizeof(int),
704 /* only handle a transition from default "0" to "1" */
705 .proc_handler
= proc_dointvec_minmax
,
710 #ifdef CONFIG_UEVENT_HELPER
712 .procname
= "hotplug",
713 .data
= &uevent_helper
,
714 .maxlen
= UEVENT_HELPER_PATH_LEN
,
716 .proc_handler
= proc_dostring
,
719 #ifdef CONFIG_CHR_DEV_SG
721 .procname
= "sg-big-buff",
722 .data
= &sg_big_buff
,
723 .maxlen
= sizeof (int),
725 .proc_handler
= proc_dointvec
,
728 #ifdef CONFIG_BSD_PROCESS_ACCT
732 .maxlen
= 3*sizeof(int),
734 .proc_handler
= proc_dointvec
,
737 #ifdef CONFIG_MAGIC_SYSRQ
740 .data
= &__sysrq_enabled
,
741 .maxlen
= sizeof (int),
743 .proc_handler
= sysrq_sysctl_handler
,
746 #ifdef CONFIG_PROC_SYSCTL
748 .procname
= "cad_pid",
750 .maxlen
= sizeof (int),
752 .proc_handler
= proc_do_cad_pid
,
756 .procname
= "threads-max",
758 .maxlen
= sizeof(int),
760 .proc_handler
= sysctl_max_threads
,
763 .procname
= "random",
765 .child
= random_table
,
768 .procname
= "usermodehelper",
770 .child
= usermodehelper_table
,
772 #ifdef CONFIG_FW_LOADER_USER_HELPER
774 .procname
= "firmware_config",
776 .child
= firmware_config_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
,
832 .procname
= "panic_print",
833 .data
= &panic_print
,
834 .maxlen
= sizeof(unsigned long),
836 .proc_handler
= proc_doulongvec_minmax
,
838 #if defined CONFIG_PRINTK
840 .procname
= "printk",
841 .data
= &console_loglevel
,
842 .maxlen
= 4*sizeof(int),
844 .proc_handler
= proc_dointvec
,
847 .procname
= "printk_ratelimit",
848 .data
= &printk_ratelimit_state
.interval
,
849 .maxlen
= sizeof(int),
851 .proc_handler
= proc_dointvec_jiffies
,
854 .procname
= "printk_ratelimit_burst",
855 .data
= &printk_ratelimit_state
.burst
,
856 .maxlen
= sizeof(int),
858 .proc_handler
= proc_dointvec
,
861 .procname
= "printk_delay",
862 .data
= &printk_delay_msec
,
863 .maxlen
= sizeof(int),
865 .proc_handler
= proc_dointvec_minmax
,
867 .extra2
= &ten_thousand
,
870 .procname
= "printk_devkmsg",
871 .data
= devkmsg_log_str
,
872 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
874 .proc_handler
= devkmsg_sysctl_set_loglvl
,
877 .procname
= "dmesg_restrict",
878 .data
= &dmesg_restrict
,
879 .maxlen
= sizeof(int),
881 .proc_handler
= proc_dointvec_minmax_sysadmin
,
886 .procname
= "kptr_restrict",
887 .data
= &kptr_restrict
,
888 .maxlen
= sizeof(int),
890 .proc_handler
= proc_dointvec_minmax_sysadmin
,
896 .procname
= "ngroups_max",
897 .data
= &ngroups_max
,
898 .maxlen
= sizeof (int),
900 .proc_handler
= proc_dointvec
,
903 .procname
= "cap_last_cap",
904 .data
= (void *)&cap_last_cap
,
905 .maxlen
= sizeof(int),
907 .proc_handler
= proc_dointvec
,
909 #if defined(CONFIG_LOCKUP_DETECTOR)
911 .procname
= "watchdog",
912 .data
= &watchdog_user_enabled
,
913 .maxlen
= sizeof(int),
915 .proc_handler
= proc_watchdog
,
920 .procname
= "watchdog_thresh",
921 .data
= &watchdog_thresh
,
922 .maxlen
= sizeof(int),
924 .proc_handler
= proc_watchdog_thresh
,
929 .procname
= "nmi_watchdog",
930 .data
= &nmi_watchdog_user_enabled
,
931 .maxlen
= sizeof(int),
932 .mode
= NMI_WATCHDOG_SYSCTL_PERM
,
933 .proc_handler
= proc_nmi_watchdog
,
938 .procname
= "watchdog_cpumask",
939 .data
= &watchdog_cpumask_bits
,
942 .proc_handler
= proc_watchdog_cpumask
,
944 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
946 .procname
= "soft_watchdog",
947 .data
= &soft_watchdog_user_enabled
,
948 .maxlen
= sizeof(int),
950 .proc_handler
= proc_soft_watchdog
,
955 .procname
= "softlockup_panic",
956 .data
= &softlockup_panic
,
957 .maxlen
= sizeof(int),
959 .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
,
973 #endif /* CONFIG_SMP */
975 #ifdef CONFIG_HARDLOCKUP_DETECTOR
977 .procname
= "hardlockup_panic",
978 .data
= &hardlockup_panic
,
979 .maxlen
= sizeof(int),
981 .proc_handler
= proc_dointvec_minmax
,
987 .procname
= "hardlockup_all_cpu_backtrace",
988 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
989 .maxlen
= sizeof(int),
991 .proc_handler
= proc_dointvec_minmax
,
995 #endif /* CONFIG_SMP */
999 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1001 .procname
= "unknown_nmi_panic",
1002 .data
= &unknown_nmi_panic
,
1003 .maxlen
= sizeof (int),
1005 .proc_handler
= proc_dointvec
,
1008 #if defined(CONFIG_X86)
1010 .procname
= "panic_on_unrecovered_nmi",
1011 .data
= &panic_on_unrecovered_nmi
,
1012 .maxlen
= sizeof(int),
1014 .proc_handler
= proc_dointvec
,
1017 .procname
= "panic_on_io_nmi",
1018 .data
= &panic_on_io_nmi
,
1019 .maxlen
= sizeof(int),
1021 .proc_handler
= proc_dointvec
,
1023 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1025 .procname
= "panic_on_stackoverflow",
1026 .data
= &sysctl_panic_on_stackoverflow
,
1027 .maxlen
= sizeof(int),
1029 .proc_handler
= proc_dointvec
,
1033 .procname
= "bootloader_type",
1034 .data
= &bootloader_type
,
1035 .maxlen
= sizeof (int),
1037 .proc_handler
= proc_dointvec
,
1040 .procname
= "bootloader_version",
1041 .data
= &bootloader_version
,
1042 .maxlen
= sizeof (int),
1044 .proc_handler
= proc_dointvec
,
1047 .procname
= "io_delay_type",
1048 .data
= &io_delay_type
,
1049 .maxlen
= sizeof(int),
1051 .proc_handler
= proc_dointvec
,
1054 #if defined(CONFIG_MMU)
1056 .procname
= "randomize_va_space",
1057 .data
= &randomize_va_space
,
1058 .maxlen
= sizeof(int),
1060 .proc_handler
= proc_dointvec
,
1063 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1065 .procname
= "spin_retry",
1066 .data
= &spin_retry
,
1067 .maxlen
= sizeof (int),
1069 .proc_handler
= proc_dointvec
,
1072 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1074 .procname
= "acpi_video_flags",
1075 .data
= &acpi_realmode_flags
,
1076 .maxlen
= sizeof (unsigned long),
1078 .proc_handler
= proc_doulongvec_minmax
,
1081 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1083 .procname
= "ignore-unaligned-usertrap",
1084 .data
= &no_unaligned_warning
,
1085 .maxlen
= sizeof (int),
1087 .proc_handler
= proc_dointvec
,
1092 .procname
= "unaligned-dump-stack",
1093 .data
= &unaligned_dump_stack
,
1094 .maxlen
= sizeof (int),
1096 .proc_handler
= proc_dointvec
,
1099 #ifdef CONFIG_DETECT_HUNG_TASK
1101 .procname
= "hung_task_panic",
1102 .data
= &sysctl_hung_task_panic
,
1103 .maxlen
= sizeof(int),
1105 .proc_handler
= proc_dointvec_minmax
,
1110 .procname
= "hung_task_check_count",
1111 .data
= &sysctl_hung_task_check_count
,
1112 .maxlen
= sizeof(int),
1114 .proc_handler
= proc_dointvec_minmax
,
1118 .procname
= "hung_task_timeout_secs",
1119 .data
= &sysctl_hung_task_timeout_secs
,
1120 .maxlen
= sizeof(unsigned long),
1122 .proc_handler
= proc_dohung_task_timeout_secs
,
1123 .extra2
= &hung_task_timeout_max
,
1126 .procname
= "hung_task_check_interval_secs",
1127 .data
= &sysctl_hung_task_check_interval_secs
,
1128 .maxlen
= sizeof(unsigned long),
1130 .proc_handler
= proc_dohung_task_timeout_secs
,
1131 .extra2
= &hung_task_timeout_max
,
1134 .procname
= "hung_task_warnings",
1135 .data
= &sysctl_hung_task_warnings
,
1136 .maxlen
= sizeof(int),
1138 .proc_handler
= proc_dointvec_minmax
,
1142 #ifdef CONFIG_RT_MUTEXES
1144 .procname
= "max_lock_depth",
1145 .data
= &max_lock_depth
,
1146 .maxlen
= sizeof(int),
1148 .proc_handler
= proc_dointvec
,
1152 .procname
= "poweroff_cmd",
1153 .data
= &poweroff_cmd
,
1154 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1156 .proc_handler
= proc_dostring
,
1162 .child
= key_sysctls
,
1165 #ifdef CONFIG_PERF_EVENTS
1167 * User-space scripts rely on the existence of this file
1168 * as a feature check for perf_events being enabled.
1170 * So it's an ABI, do not remove!
1173 .procname
= "perf_event_paranoid",
1174 .data
= &sysctl_perf_event_paranoid
,
1175 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1177 .proc_handler
= proc_dointvec
,
1180 .procname
= "perf_event_mlock_kb",
1181 .data
= &sysctl_perf_event_mlock
,
1182 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1184 .proc_handler
= proc_dointvec
,
1187 .procname
= "perf_event_max_sample_rate",
1188 .data
= &sysctl_perf_event_sample_rate
,
1189 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1191 .proc_handler
= perf_proc_update_handler
,
1195 .procname
= "perf_cpu_time_max_percent",
1196 .data
= &sysctl_perf_cpu_time_max_percent
,
1197 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1199 .proc_handler
= perf_cpu_time_max_percent_handler
,
1201 .extra2
= &one_hundred
,
1204 .procname
= "perf_event_max_stack",
1205 .data
= &sysctl_perf_event_max_stack
,
1206 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1208 .proc_handler
= perf_event_max_stack_handler
,
1210 .extra2
= &six_hundred_forty_kb
,
1213 .procname
= "perf_event_max_contexts_per_stack",
1214 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1215 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1217 .proc_handler
= perf_event_max_stack_handler
,
1219 .extra2
= &one_thousand
,
1223 .procname
= "panic_on_warn",
1224 .data
= &panic_on_warn
,
1225 .maxlen
= sizeof(int),
1227 .proc_handler
= proc_dointvec_minmax
,
1231 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1233 .procname
= "timer_migration",
1234 .data
= &sysctl_timer_migration
,
1235 .maxlen
= sizeof(unsigned int),
1237 .proc_handler
= timer_migration_handler
,
1242 #ifdef CONFIG_BPF_SYSCALL
1244 .procname
= "unprivileged_bpf_disabled",
1245 .data
= &sysctl_unprivileged_bpf_disabled
,
1246 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1248 /* only handle a transition from default "0" to "1" */
1249 .proc_handler
= proc_dointvec_minmax
,
1254 .procname
= "bpf_stats_enabled",
1255 .data
= &sysctl_bpf_stats_enabled
,
1256 .maxlen
= sizeof(sysctl_bpf_stats_enabled
),
1258 .proc_handler
= proc_dointvec_minmax_bpf_stats
,
1263 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1265 .procname
= "panic_on_rcu_stall",
1266 .data
= &sysctl_panic_on_rcu_stall
,
1267 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1269 .proc_handler
= proc_dointvec_minmax
,
1274 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1276 .procname
= "stack_erasing",
1278 .maxlen
= sizeof(int),
1280 .proc_handler
= stack_erasing_sysctl
,
1288 static struct ctl_table vm_table
[] = {
1290 .procname
= "overcommit_memory",
1291 .data
= &sysctl_overcommit_memory
,
1292 .maxlen
= sizeof(sysctl_overcommit_memory
),
1294 .proc_handler
= proc_dointvec_minmax
,
1299 .procname
= "panic_on_oom",
1300 .data
= &sysctl_panic_on_oom
,
1301 .maxlen
= sizeof(sysctl_panic_on_oom
),
1303 .proc_handler
= proc_dointvec_minmax
,
1308 .procname
= "oom_kill_allocating_task",
1309 .data
= &sysctl_oom_kill_allocating_task
,
1310 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1312 .proc_handler
= proc_dointvec
,
1315 .procname
= "oom_dump_tasks",
1316 .data
= &sysctl_oom_dump_tasks
,
1317 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1319 .proc_handler
= proc_dointvec
,
1322 .procname
= "overcommit_ratio",
1323 .data
= &sysctl_overcommit_ratio
,
1324 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1326 .proc_handler
= overcommit_ratio_handler
,
1329 .procname
= "overcommit_kbytes",
1330 .data
= &sysctl_overcommit_kbytes
,
1331 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1333 .proc_handler
= overcommit_kbytes_handler
,
1336 .procname
= "page-cluster",
1337 .data
= &page_cluster
,
1338 .maxlen
= sizeof(int),
1340 .proc_handler
= proc_dointvec_minmax
,
1344 .procname
= "dirty_background_ratio",
1345 .data
= &dirty_background_ratio
,
1346 .maxlen
= sizeof(dirty_background_ratio
),
1348 .proc_handler
= dirty_background_ratio_handler
,
1350 .extra2
= &one_hundred
,
1353 .procname
= "dirty_background_bytes",
1354 .data
= &dirty_background_bytes
,
1355 .maxlen
= sizeof(dirty_background_bytes
),
1357 .proc_handler
= dirty_background_bytes_handler
,
1361 .procname
= "dirty_ratio",
1362 .data
= &vm_dirty_ratio
,
1363 .maxlen
= sizeof(vm_dirty_ratio
),
1365 .proc_handler
= dirty_ratio_handler
,
1367 .extra2
= &one_hundred
,
1370 .procname
= "dirty_bytes",
1371 .data
= &vm_dirty_bytes
,
1372 .maxlen
= sizeof(vm_dirty_bytes
),
1374 .proc_handler
= dirty_bytes_handler
,
1375 .extra1
= &dirty_bytes_min
,
1378 .procname
= "dirty_writeback_centisecs",
1379 .data
= &dirty_writeback_interval
,
1380 .maxlen
= sizeof(dirty_writeback_interval
),
1382 .proc_handler
= dirty_writeback_centisecs_handler
,
1385 .procname
= "dirty_expire_centisecs",
1386 .data
= &dirty_expire_interval
,
1387 .maxlen
= sizeof(dirty_expire_interval
),
1389 .proc_handler
= proc_dointvec_minmax
,
1393 .procname
= "dirtytime_expire_seconds",
1394 .data
= &dirtytime_expire_interval
,
1395 .maxlen
= sizeof(dirtytime_expire_interval
),
1397 .proc_handler
= dirtytime_interval_handler
,
1401 .procname
= "swappiness",
1402 .data
= &vm_swappiness
,
1403 .maxlen
= sizeof(vm_swappiness
),
1405 .proc_handler
= proc_dointvec_minmax
,
1407 .extra2
= &one_hundred
,
1409 #ifdef CONFIG_HUGETLB_PAGE
1411 .procname
= "nr_hugepages",
1413 .maxlen
= sizeof(unsigned long),
1415 .proc_handler
= hugetlb_sysctl_handler
,
1419 .procname
= "nr_hugepages_mempolicy",
1421 .maxlen
= sizeof(unsigned long),
1423 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1426 .procname
= "numa_stat",
1427 .data
= &sysctl_vm_numa_stat
,
1428 .maxlen
= sizeof(int),
1430 .proc_handler
= sysctl_vm_numa_stat_handler
,
1436 .procname
= "hugetlb_shm_group",
1437 .data
= &sysctl_hugetlb_shm_group
,
1438 .maxlen
= sizeof(gid_t
),
1440 .proc_handler
= proc_dointvec
,
1443 .procname
= "nr_overcommit_hugepages",
1445 .maxlen
= sizeof(unsigned long),
1447 .proc_handler
= hugetlb_overcommit_handler
,
1451 .procname
= "lowmem_reserve_ratio",
1452 .data
= &sysctl_lowmem_reserve_ratio
,
1453 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1455 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1458 .procname
= "drop_caches",
1459 .data
= &sysctl_drop_caches
,
1460 .maxlen
= sizeof(int),
1462 .proc_handler
= drop_caches_sysctl_handler
,
1466 #ifdef CONFIG_COMPACTION
1468 .procname
= "compact_memory",
1469 .data
= &sysctl_compact_memory
,
1470 .maxlen
= sizeof(int),
1472 .proc_handler
= sysctl_compaction_handler
,
1475 .procname
= "extfrag_threshold",
1476 .data
= &sysctl_extfrag_threshold
,
1477 .maxlen
= sizeof(int),
1479 .proc_handler
= proc_dointvec_minmax
,
1480 .extra1
= &min_extfrag_threshold
,
1481 .extra2
= &max_extfrag_threshold
,
1484 .procname
= "compact_unevictable_allowed",
1485 .data
= &sysctl_compact_unevictable_allowed
,
1486 .maxlen
= sizeof(int),
1488 .proc_handler
= proc_dointvec
,
1493 #endif /* CONFIG_COMPACTION */
1495 .procname
= "min_free_kbytes",
1496 .data
= &min_free_kbytes
,
1497 .maxlen
= sizeof(min_free_kbytes
),
1499 .proc_handler
= min_free_kbytes_sysctl_handler
,
1503 .procname
= "watermark_boost_factor",
1504 .data
= &watermark_boost_factor
,
1505 .maxlen
= sizeof(watermark_boost_factor
),
1507 .proc_handler
= watermark_boost_factor_sysctl_handler
,
1511 .procname
= "watermark_scale_factor",
1512 .data
= &watermark_scale_factor
,
1513 .maxlen
= sizeof(watermark_scale_factor
),
1515 .proc_handler
= watermark_scale_factor_sysctl_handler
,
1517 .extra2
= &one_thousand
,
1520 .procname
= "percpu_pagelist_fraction",
1521 .data
= &percpu_pagelist_fraction
,
1522 .maxlen
= sizeof(percpu_pagelist_fraction
),
1524 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1529 .procname
= "max_map_count",
1530 .data
= &sysctl_max_map_count
,
1531 .maxlen
= sizeof(sysctl_max_map_count
),
1533 .proc_handler
= proc_dointvec_minmax
,
1538 .procname
= "nr_trim_pages",
1539 .data
= &sysctl_nr_trim_pages
,
1540 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1542 .proc_handler
= proc_dointvec_minmax
,
1547 .procname
= "laptop_mode",
1548 .data
= &laptop_mode
,
1549 .maxlen
= sizeof(laptop_mode
),
1551 .proc_handler
= proc_dointvec_jiffies
,
1554 .procname
= "block_dump",
1555 .data
= &block_dump
,
1556 .maxlen
= sizeof(block_dump
),
1558 .proc_handler
= proc_dointvec
,
1562 .procname
= "vfs_cache_pressure",
1563 .data
= &sysctl_vfs_cache_pressure
,
1564 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1566 .proc_handler
= proc_dointvec
,
1569 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1571 .procname
= "legacy_va_layout",
1572 .data
= &sysctl_legacy_va_layout
,
1573 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1575 .proc_handler
= proc_dointvec
,
1581 .procname
= "zone_reclaim_mode",
1582 .data
= &node_reclaim_mode
,
1583 .maxlen
= sizeof(node_reclaim_mode
),
1585 .proc_handler
= proc_dointvec
,
1589 .procname
= "min_unmapped_ratio",
1590 .data
= &sysctl_min_unmapped_ratio
,
1591 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1593 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1595 .extra2
= &one_hundred
,
1598 .procname
= "min_slab_ratio",
1599 .data
= &sysctl_min_slab_ratio
,
1600 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1602 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1604 .extra2
= &one_hundred
,
1609 .procname
= "stat_interval",
1610 .data
= &sysctl_stat_interval
,
1611 .maxlen
= sizeof(sysctl_stat_interval
),
1613 .proc_handler
= proc_dointvec_jiffies
,
1616 .procname
= "stat_refresh",
1620 .proc_handler
= vmstat_refresh
,
1625 .procname
= "mmap_min_addr",
1626 .data
= &dac_mmap_min_addr
,
1627 .maxlen
= sizeof(unsigned long),
1629 .proc_handler
= mmap_min_addr_handler
,
1634 .procname
= "numa_zonelist_order",
1635 .data
= &numa_zonelist_order
,
1636 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1638 .proc_handler
= numa_zonelist_order_handler
,
1641 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1642 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1644 .procname
= "vdso_enabled",
1645 #ifdef CONFIG_X86_32
1646 .data
= &vdso32_enabled
,
1647 .maxlen
= sizeof(vdso32_enabled
),
1649 .data
= &vdso_enabled
,
1650 .maxlen
= sizeof(vdso_enabled
),
1653 .proc_handler
= proc_dointvec
,
1657 #ifdef CONFIG_HIGHMEM
1659 .procname
= "highmem_is_dirtyable",
1660 .data
= &vm_highmem_is_dirtyable
,
1661 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1663 .proc_handler
= proc_dointvec_minmax
,
1668 #ifdef CONFIG_MEMORY_FAILURE
1670 .procname
= "memory_failure_early_kill",
1671 .data
= &sysctl_memory_failure_early_kill
,
1672 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1674 .proc_handler
= proc_dointvec_minmax
,
1679 .procname
= "memory_failure_recovery",
1680 .data
= &sysctl_memory_failure_recovery
,
1681 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1683 .proc_handler
= proc_dointvec_minmax
,
1689 .procname
= "user_reserve_kbytes",
1690 .data
= &sysctl_user_reserve_kbytes
,
1691 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1693 .proc_handler
= proc_doulongvec_minmax
,
1696 .procname
= "admin_reserve_kbytes",
1697 .data
= &sysctl_admin_reserve_kbytes
,
1698 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1700 .proc_handler
= proc_doulongvec_minmax
,
1702 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1704 .procname
= "mmap_rnd_bits",
1705 .data
= &mmap_rnd_bits
,
1706 .maxlen
= sizeof(mmap_rnd_bits
),
1708 .proc_handler
= proc_dointvec_minmax
,
1709 .extra1
= (void *)&mmap_rnd_bits_min
,
1710 .extra2
= (void *)&mmap_rnd_bits_max
,
1713 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1715 .procname
= "mmap_rnd_compat_bits",
1716 .data
= &mmap_rnd_compat_bits
,
1717 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1719 .proc_handler
= proc_dointvec_minmax
,
1720 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1721 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1724 #ifdef CONFIG_USERFAULTFD
1726 .procname
= "unprivileged_userfaultfd",
1727 .data
= &sysctl_unprivileged_userfaultfd
,
1728 .maxlen
= sizeof(sysctl_unprivileged_userfaultfd
),
1730 .proc_handler
= proc_dointvec_minmax
,
1738 static struct ctl_table fs_table
[] = {
1740 .procname
= "inode-nr",
1741 .data
= &inodes_stat
,
1742 .maxlen
= 2*sizeof(long),
1744 .proc_handler
= proc_nr_inodes
,
1747 .procname
= "inode-state",
1748 .data
= &inodes_stat
,
1749 .maxlen
= 7*sizeof(long),
1751 .proc_handler
= proc_nr_inodes
,
1754 .procname
= "file-nr",
1755 .data
= &files_stat
,
1756 .maxlen
= sizeof(files_stat
),
1758 .proc_handler
= proc_nr_files
,
1761 .procname
= "file-max",
1762 .data
= &files_stat
.max_files
,
1763 .maxlen
= sizeof(files_stat
.max_files
),
1765 .proc_handler
= proc_doulongvec_minmax
,
1767 .extra2
= &long_max
,
1770 .procname
= "nr_open",
1771 .data
= &sysctl_nr_open
,
1772 .maxlen
= sizeof(unsigned int),
1774 .proc_handler
= proc_dointvec_minmax
,
1775 .extra1
= &sysctl_nr_open_min
,
1776 .extra2
= &sysctl_nr_open_max
,
1779 .procname
= "dentry-state",
1780 .data
= &dentry_stat
,
1781 .maxlen
= 6*sizeof(long),
1783 .proc_handler
= proc_nr_dentry
,
1786 .procname
= "overflowuid",
1787 .data
= &fs_overflowuid
,
1788 .maxlen
= sizeof(int),
1790 .proc_handler
= proc_dointvec_minmax
,
1791 .extra1
= &minolduid
,
1792 .extra2
= &maxolduid
,
1795 .procname
= "overflowgid",
1796 .data
= &fs_overflowgid
,
1797 .maxlen
= sizeof(int),
1799 .proc_handler
= proc_dointvec_minmax
,
1800 .extra1
= &minolduid
,
1801 .extra2
= &maxolduid
,
1803 #ifdef CONFIG_FILE_LOCKING
1805 .procname
= "leases-enable",
1806 .data
= &leases_enable
,
1807 .maxlen
= sizeof(int),
1809 .proc_handler
= proc_dointvec
,
1812 #ifdef CONFIG_DNOTIFY
1814 .procname
= "dir-notify-enable",
1815 .data
= &dir_notify_enable
,
1816 .maxlen
= sizeof(int),
1818 .proc_handler
= proc_dointvec
,
1822 #ifdef CONFIG_FILE_LOCKING
1824 .procname
= "lease-break-time",
1825 .data
= &lease_break_time
,
1826 .maxlen
= sizeof(int),
1828 .proc_handler
= proc_dointvec
,
1833 .procname
= "aio-nr",
1835 .maxlen
= sizeof(aio_nr
),
1837 .proc_handler
= proc_doulongvec_minmax
,
1840 .procname
= "aio-max-nr",
1841 .data
= &aio_max_nr
,
1842 .maxlen
= sizeof(aio_max_nr
),
1844 .proc_handler
= proc_doulongvec_minmax
,
1846 #endif /* CONFIG_AIO */
1847 #ifdef CONFIG_INOTIFY_USER
1849 .procname
= "inotify",
1851 .child
= inotify_table
,
1856 .procname
= "epoll",
1858 .child
= epoll_table
,
1863 .procname
= "protected_symlinks",
1864 .data
= &sysctl_protected_symlinks
,
1865 .maxlen
= sizeof(int),
1867 .proc_handler
= proc_dointvec_minmax
,
1872 .procname
= "protected_hardlinks",
1873 .data
= &sysctl_protected_hardlinks
,
1874 .maxlen
= sizeof(int),
1876 .proc_handler
= proc_dointvec_minmax
,
1881 .procname
= "protected_fifos",
1882 .data
= &sysctl_protected_fifos
,
1883 .maxlen
= sizeof(int),
1885 .proc_handler
= proc_dointvec_minmax
,
1890 .procname
= "protected_regular",
1891 .data
= &sysctl_protected_regular
,
1892 .maxlen
= sizeof(int),
1894 .proc_handler
= proc_dointvec_minmax
,
1899 .procname
= "suid_dumpable",
1900 .data
= &suid_dumpable
,
1901 .maxlen
= sizeof(int),
1903 .proc_handler
= proc_dointvec_minmax_coredump
,
1907 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1909 .procname
= "binfmt_misc",
1911 .child
= sysctl_mount_point
,
1915 .procname
= "pipe-max-size",
1916 .data
= &pipe_max_size
,
1917 .maxlen
= sizeof(pipe_max_size
),
1919 .proc_handler
= proc_dopipe_max_size
,
1922 .procname
= "pipe-user-pages-hard",
1923 .data
= &pipe_user_pages_hard
,
1924 .maxlen
= sizeof(pipe_user_pages_hard
),
1926 .proc_handler
= proc_doulongvec_minmax
,
1929 .procname
= "pipe-user-pages-soft",
1930 .data
= &pipe_user_pages_soft
,
1931 .maxlen
= sizeof(pipe_user_pages_soft
),
1933 .proc_handler
= proc_doulongvec_minmax
,
1936 .procname
= "mount-max",
1937 .data
= &sysctl_mount_max
,
1938 .maxlen
= sizeof(unsigned int),
1940 .proc_handler
= proc_dointvec_minmax
,
1946 static struct ctl_table debug_table
[] = {
1947 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1949 .procname
= "exception-trace",
1950 .data
= &show_unhandled_signals
,
1951 .maxlen
= sizeof(int),
1953 .proc_handler
= proc_dointvec
1956 #if defined(CONFIG_OPTPROBES)
1958 .procname
= "kprobes-optimization",
1959 .data
= &sysctl_kprobes_optimization
,
1960 .maxlen
= sizeof(int),
1962 .proc_handler
= proc_kprobes_optimization_handler
,
1970 static struct ctl_table dev_table
[] = {
1974 int __init
sysctl_init(void)
1976 struct ctl_table_header
*hdr
;
1978 hdr
= register_sysctl_table(sysctl_base_table
);
1979 kmemleak_not_leak(hdr
);
1983 #endif /* CONFIG_SYSCTL */
1989 #ifdef CONFIG_PROC_SYSCTL
1991 static int _proc_do_string(char *data
, int maxlen
, int write
,
1992 char __user
*buffer
,
1993 size_t *lenp
, loff_t
*ppos
)
1999 if (!data
|| !maxlen
|| !*lenp
) {
2005 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
2006 /* Only continue writes not past the end of buffer. */
2008 if (len
> maxlen
- 1)
2015 /* Start writing from beginning of buffer. */
2021 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
2022 if (get_user(c
, p
++))
2024 if (c
== 0 || c
== '\n')
2045 if (copy_to_user(buffer
, data
, len
))
2048 if (put_user('\n', buffer
+ len
))
2058 static void warn_sysctl_write(struct ctl_table
*table
)
2060 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2061 "This will not be supported in the future. To silence this\n"
2062 "warning, set kernel.sysctl_writes_strict = -1\n",
2063 current
->comm
, table
->procname
);
2067 * proc_first_pos_non_zero_ignore - check if first position is allowed
2068 * @ppos: file position
2069 * @table: the sysctl table
2071 * Returns true if the first position is non-zero and the sysctl_writes_strict
2072 * mode indicates this is not allowed for numeric input types. String proc
2073 * handlers can ignore the return value.
2075 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
2076 struct ctl_table
*table
)
2081 switch (sysctl_writes_strict
) {
2082 case SYSCTL_WRITES_STRICT
:
2084 case SYSCTL_WRITES_WARN
:
2085 warn_sysctl_write(table
);
2093 * proc_dostring - read a string sysctl
2094 * @table: the sysctl table
2095 * @write: %TRUE if this is a write to the sysctl file
2096 * @buffer: the user buffer
2097 * @lenp: the size of the user buffer
2098 * @ppos: file position
2100 * Reads/writes a string from/to the user buffer. If the kernel
2101 * buffer provided is not large enough to hold the string, the
2102 * string is truncated. The copied string is %NULL-terminated.
2103 * If the string is being read by the user process, it is copied
2104 * and a newline '\n' is added. It is truncated if the buffer is
2107 * Returns 0 on success.
2109 int proc_dostring(struct ctl_table
*table
, int write
,
2110 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2113 proc_first_pos_non_zero_ignore(ppos
, table
);
2115 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2116 (char __user
*)buffer
, lenp
, ppos
);
2119 static size_t proc_skip_spaces(char **buf
)
2122 char *tmp
= skip_spaces(*buf
);
2128 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2139 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2142 * @cp: kernel buffer containing the string to parse
2143 * @endp: pointer to store the trailing characters
2144 * @base: the base to use
2145 * @res: where the parsed integer will be stored
2147 * In case of success 0 is returned and @res will contain the parsed integer,
2148 * @endp will hold any trailing characters.
2149 * This function will fail the parse on overflow. If there wasn't an overflow
2150 * the function will defer the decision what characters count as invalid to the
2153 static int strtoul_lenient(const char *cp
, char **endp
, unsigned int base
,
2156 unsigned long long result
;
2159 cp
= _parse_integer_fixup_radix(cp
, &base
);
2160 rv
= _parse_integer(cp
, base
, &result
);
2161 if ((rv
& KSTRTOX_OVERFLOW
) || (result
!= (unsigned long)result
))
2169 *res
= (unsigned long)result
;
2173 #define TMPBUFLEN 22
2175 * proc_get_long - reads an ASCII formatted integer from a user buffer
2177 * @buf: a kernel buffer
2178 * @size: size of the kernel buffer
2179 * @val: this is where the number will be stored
2180 * @neg: set to %TRUE if number is negative
2181 * @perm_tr: a vector which contains the allowed trailers
2182 * @perm_tr_len: size of the perm_tr vector
2183 * @tr: pointer to store the trailer character
2185 * In case of success %0 is returned and @buf and @size are updated with
2186 * the amount of bytes read. If @tr is non-NULL and a trailing
2187 * character exists (size is non-zero after returning from this
2188 * function), @tr is updated with the trailing character.
2190 static int proc_get_long(char **buf
, size_t *size
,
2191 unsigned long *val
, bool *neg
,
2192 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2195 char *p
, tmp
[TMPBUFLEN
];
2201 if (len
> TMPBUFLEN
- 1)
2202 len
= TMPBUFLEN
- 1;
2204 memcpy(tmp
, *buf
, len
);
2208 if (*p
== '-' && *size
> 1) {
2216 if (strtoul_lenient(p
, &p
, 0, val
))
2221 /* We don't know if the next char is whitespace thus we may accept
2222 * invalid integers (e.g. 1234...a) or two integers instead of one
2223 * (e.g. 123...1). So lets not allow such large numbers. */
2224 if (len
== TMPBUFLEN
- 1)
2227 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2230 if (tr
&& (len
< *size
))
2240 * proc_put_long - converts an integer to a decimal ASCII formatted string
2242 * @buf: the user buffer
2243 * @size: the size of the user buffer
2244 * @val: the integer to be converted
2245 * @neg: sign of the number, %TRUE for negative
2247 * In case of success %0 is returned and @buf and @size are updated with
2248 * the amount of bytes written.
2250 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2254 char tmp
[TMPBUFLEN
], *p
= tmp
;
2256 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2260 if (copy_to_user(*buf
, tmp
, len
))
2268 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2271 char __user
**buffer
= (char __user
**)buf
;
2272 if (put_user(c
, *buffer
))
2274 (*size
)--, (*buffer
)++;
2280 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2282 int write
, void *data
)
2286 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2290 if (*lvalp
> (unsigned long) INT_MAX
)
2298 *lvalp
= -(unsigned long)val
;
2301 *lvalp
= (unsigned long)val
;
2307 static int do_proc_douintvec_conv(unsigned long *lvalp
,
2309 int write
, void *data
)
2312 if (*lvalp
> UINT_MAX
)
2316 unsigned int val
= *valp
;
2317 *lvalp
= (unsigned long)val
;
2322 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2324 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2325 int write
, void __user
*buffer
,
2326 size_t *lenp
, loff_t
*ppos
,
2327 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2328 int write
, void *data
),
2331 int *i
, vleft
, first
= 1, err
= 0;
2333 char *kbuf
= NULL
, *p
;
2335 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2340 i
= (int *) tbl_data
;
2341 vleft
= table
->maxlen
/ sizeof(*i
);
2345 conv
= do_proc_dointvec_conv
;
2348 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2351 if (left
> PAGE_SIZE
- 1)
2352 left
= PAGE_SIZE
- 1;
2353 p
= kbuf
= memdup_user_nul(buffer
, left
);
2355 return PTR_ERR(kbuf
);
2358 for (; left
&& vleft
--; i
++, first
=0) {
2363 left
-= proc_skip_spaces(&p
);
2367 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2369 sizeof(proc_wspace_sep
), NULL
);
2372 if (conv(&neg
, &lval
, i
, 1, data
)) {
2377 if (conv(&neg
, &lval
, i
, 0, data
)) {
2382 err
= proc_put_char(&buffer
, &left
, '\t');
2385 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2391 if (!write
&& !first
&& left
&& !err
)
2392 err
= proc_put_char(&buffer
, &left
, '\n');
2393 if (write
&& !err
&& left
)
2394 left
-= proc_skip_spaces(&p
);
2398 return err
? : -EINVAL
;
2406 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2407 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2408 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2409 int write
, void *data
),
2412 return __do_proc_dointvec(table
->data
, table
, write
,
2413 buffer
, lenp
, ppos
, conv
, data
);
2416 static int do_proc_douintvec_w(unsigned int *tbl_data
,
2417 struct ctl_table
*table
,
2418 void __user
*buffer
,
2419 size_t *lenp
, loff_t
*ppos
,
2420 int (*conv
)(unsigned long *lvalp
,
2422 int write
, void *data
),
2429 char *kbuf
= NULL
, *p
;
2433 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2436 if (left
> PAGE_SIZE
- 1)
2437 left
= PAGE_SIZE
- 1;
2439 p
= kbuf
= memdup_user_nul(buffer
, left
);
2443 left
-= proc_skip_spaces(&p
);
2449 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2451 sizeof(proc_wspace_sep
), NULL
);
2457 if (conv(&lval
, tbl_data
, 1, data
)) {
2463 left
-= proc_skip_spaces(&p
);
2472 /* This is in keeping with old __do_proc_dointvec() */
2478 static int do_proc_douintvec_r(unsigned int *tbl_data
, void __user
*buffer
,
2479 size_t *lenp
, loff_t
*ppos
,
2480 int (*conv
)(unsigned long *lvalp
,
2482 int write
, void *data
),
2491 if (conv(&lval
, tbl_data
, 0, data
)) {
2496 err
= proc_put_long(&buffer
, &left
, lval
, false);
2500 err
= proc_put_char(&buffer
, &left
, '\n');
2509 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
2510 int write
, void __user
*buffer
,
2511 size_t *lenp
, loff_t
*ppos
,
2512 int (*conv
)(unsigned long *lvalp
,
2514 int write
, void *data
),
2517 unsigned int *i
, vleft
;
2519 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2524 i
= (unsigned int *) tbl_data
;
2525 vleft
= table
->maxlen
/ sizeof(*i
);
2528 * Arrays are not supported, keep this simple. *Do not* add
2537 conv
= do_proc_douintvec_conv
;
2540 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
2542 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
2545 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
2546 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2547 int (*conv
)(unsigned long *lvalp
,
2549 int write
, void *data
),
2552 return __do_proc_douintvec(table
->data
, table
, write
,
2553 buffer
, lenp
, ppos
, conv
, data
);
2557 * proc_dointvec - read a vector of integers
2558 * @table: the sysctl table
2559 * @write: %TRUE if this is a write to the sysctl file
2560 * @buffer: the user buffer
2561 * @lenp: the size of the user buffer
2562 * @ppos: file position
2564 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2565 * values from/to the user buffer, treated as an ASCII string.
2567 * Returns 0 on success.
2569 int proc_dointvec(struct ctl_table
*table
, int write
,
2570 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2572 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2576 * proc_douintvec - read a vector of unsigned integers
2577 * @table: the sysctl table
2578 * @write: %TRUE if this is a write to the sysctl file
2579 * @buffer: the user buffer
2580 * @lenp: the size of the user buffer
2581 * @ppos: file position
2583 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2584 * values from/to the user buffer, treated as an ASCII string.
2586 * Returns 0 on success.
2588 int proc_douintvec(struct ctl_table
*table
, int write
,
2589 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2591 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2592 do_proc_douintvec_conv
, NULL
);
2596 * Taint values can only be increased
2597 * This means we can safely use a temporary.
2599 static int proc_taint(struct ctl_table
*table
, int write
,
2600 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2603 unsigned long tmptaint
= get_taint();
2606 if (write
&& !capable(CAP_SYS_ADMIN
))
2611 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2617 * Poor man's atomic or. Not worth adding a primitive
2618 * to everyone's atomic.h for this
2621 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2622 if ((tmptaint
>> i
) & 1)
2623 add_taint(i
, LOCKDEP_STILL_OK
);
2630 #ifdef CONFIG_PRINTK
2631 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2632 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2634 if (write
&& !capable(CAP_SYS_ADMIN
))
2637 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2642 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2643 * @min: pointer to minimum allowable value
2644 * @max: pointer to maximum allowable value
2646 * The do_proc_dointvec_minmax_conv_param structure provides the
2647 * minimum and maximum values for doing range checking for those sysctl
2648 * parameters that use the proc_dointvec_minmax() handler.
2650 struct do_proc_dointvec_minmax_conv_param
{
2655 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2657 int write
, void *data
)
2660 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2662 * If writing, first do so via a temporary local int so we can
2663 * bounds-check it before touching *valp.
2665 int *ip
= write
? &tmp
: valp
;
2667 ret
= do_proc_dointvec_conv(negp
, lvalp
, ip
, write
, data
);
2672 if ((param
->min
&& *param
->min
> tmp
) ||
2673 (param
->max
&& *param
->max
< tmp
))
2682 * proc_dointvec_minmax - read a vector of integers with min/max values
2683 * @table: the sysctl table
2684 * @write: %TRUE if this is a write to the sysctl file
2685 * @buffer: the user buffer
2686 * @lenp: the size of the user buffer
2687 * @ppos: file position
2689 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2690 * values from/to the user buffer, treated as an ASCII string.
2692 * This routine will ensure the values are within the range specified by
2693 * table->extra1 (min) and table->extra2 (max).
2695 * Returns 0 on success or -EINVAL on write when the range check fails.
2697 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2698 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2700 struct do_proc_dointvec_minmax_conv_param param
= {
2701 .min
= (int *) table
->extra1
,
2702 .max
= (int *) table
->extra2
,
2704 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2705 do_proc_dointvec_minmax_conv
, ¶m
);
2709 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2710 * @min: pointer to minimum allowable value
2711 * @max: pointer to maximum allowable value
2713 * The do_proc_douintvec_minmax_conv_param structure provides the
2714 * minimum and maximum values for doing range checking for those sysctl
2715 * parameters that use the proc_douintvec_minmax() handler.
2717 struct do_proc_douintvec_minmax_conv_param
{
2722 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
2724 int write
, void *data
)
2728 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
2729 /* write via temporary local uint for bounds-checking */
2730 unsigned int *up
= write
? &tmp
: valp
;
2732 ret
= do_proc_douintvec_conv(lvalp
, up
, write
, data
);
2737 if ((param
->min
&& *param
->min
> tmp
) ||
2738 (param
->max
&& *param
->max
< tmp
))
2748 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2749 * @table: the sysctl table
2750 * @write: %TRUE if this is a write to the sysctl file
2751 * @buffer: the user buffer
2752 * @lenp: the size of the user buffer
2753 * @ppos: file position
2755 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2756 * values from/to the user buffer, treated as an ASCII string. Negative
2757 * strings are not allowed.
2759 * This routine will ensure the values are within the range specified by
2760 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2761 * check for UINT_MAX to avoid having to support wrap around uses from
2764 * Returns 0 on success or -ERANGE on write when the range check fails.
2766 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
2767 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2769 struct do_proc_douintvec_minmax_conv_param param
= {
2770 .min
= (unsigned int *) table
->extra1
,
2771 .max
= (unsigned int *) table
->extra2
,
2773 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2774 do_proc_douintvec_minmax_conv
, ¶m
);
2777 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp
,
2779 int write
, void *data
)
2784 val
= round_pipe_size(*lvalp
);
2790 unsigned int val
= *valp
;
2791 *lvalp
= (unsigned long) val
;
2797 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
2798 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2800 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2801 do_proc_dopipe_max_size_conv
, NULL
);
2804 static void validate_coredump_safety(void)
2806 #ifdef CONFIG_COREDUMP
2807 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2808 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2810 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2811 "Pipe handler or fully qualified core dump path required.\n"
2812 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2818 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2819 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2821 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2823 validate_coredump_safety();
2827 #ifdef CONFIG_COREDUMP
2828 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2829 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2831 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2833 validate_coredump_safety();
2838 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2839 void __user
*buffer
,
2840 size_t *lenp
, loff_t
*ppos
,
2841 unsigned long convmul
,
2842 unsigned long convdiv
)
2844 unsigned long *i
, *min
, *max
;
2845 int vleft
, first
= 1, err
= 0;
2847 char *kbuf
= NULL
, *p
;
2849 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2854 i
= (unsigned long *) data
;
2855 min
= (unsigned long *) table
->extra1
;
2856 max
= (unsigned long *) table
->extra2
;
2857 vleft
= table
->maxlen
/ sizeof(unsigned long);
2861 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2864 if (left
> PAGE_SIZE
- 1)
2865 left
= PAGE_SIZE
- 1;
2866 p
= kbuf
= memdup_user_nul(buffer
, left
);
2868 return PTR_ERR(kbuf
);
2871 for (; left
&& vleft
--; i
++, first
= 0) {
2877 left
-= proc_skip_spaces(&p
);
2881 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2883 sizeof(proc_wspace_sep
), NULL
);
2888 val
= convmul
* val
/ convdiv
;
2889 if ((min
&& val
< *min
) || (max
&& val
> *max
)) {
2895 val
= convdiv
* (*i
) / convmul
;
2897 err
= proc_put_char(&buffer
, &left
, '\t');
2901 err
= proc_put_long(&buffer
, &left
, val
, false);
2907 if (!write
&& !first
&& left
&& !err
)
2908 err
= proc_put_char(&buffer
, &left
, '\n');
2910 left
-= proc_skip_spaces(&p
);
2914 return err
? : -EINVAL
;
2922 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2923 void __user
*buffer
,
2924 size_t *lenp
, loff_t
*ppos
,
2925 unsigned long convmul
,
2926 unsigned long convdiv
)
2928 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2929 buffer
, lenp
, ppos
, convmul
, convdiv
);
2933 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2934 * @table: the sysctl table
2935 * @write: %TRUE if this is a write to the sysctl file
2936 * @buffer: the user buffer
2937 * @lenp: the size of the user buffer
2938 * @ppos: file position
2940 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2941 * values from/to the user buffer, treated as an ASCII string.
2943 * This routine will ensure the values are within the range specified by
2944 * table->extra1 (min) and table->extra2 (max).
2946 * Returns 0 on success.
2948 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2949 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2951 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2955 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2956 * @table: the sysctl table
2957 * @write: %TRUE if this is a write to the sysctl file
2958 * @buffer: the user buffer
2959 * @lenp: the size of the user buffer
2960 * @ppos: file position
2962 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2963 * values from/to the user buffer, treated as an ASCII string. The values
2964 * are treated as milliseconds, and converted to jiffies when they are stored.
2966 * This routine will ensure the values are within the range specified by
2967 * table->extra1 (min) and table->extra2 (max).
2969 * Returns 0 on success.
2971 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2972 void __user
*buffer
,
2973 size_t *lenp
, loff_t
*ppos
)
2975 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2976 lenp
, ppos
, HZ
, 1000l);
2980 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2982 int write
, void *data
)
2985 if (*lvalp
> INT_MAX
/ HZ
)
2987 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2993 lval
= -(unsigned long)val
;
2996 lval
= (unsigned long)val
;
3003 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
3005 int write
, void *data
)
3008 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
3010 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
3016 lval
= -(unsigned long)val
;
3019 lval
= (unsigned long)val
;
3021 *lvalp
= jiffies_to_clock_t(lval
);
3026 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
3028 int write
, void *data
)
3031 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
3041 lval
= -(unsigned long)val
;
3044 lval
= (unsigned long)val
;
3046 *lvalp
= jiffies_to_msecs(lval
);
3052 * proc_dointvec_jiffies - read a vector of integers as seconds
3053 * @table: the sysctl table
3054 * @write: %TRUE if this is a write to the sysctl file
3055 * @buffer: the user buffer
3056 * @lenp: the size of the user buffer
3057 * @ppos: file position
3059 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3060 * values from/to the user buffer, treated as an ASCII string.
3061 * The values read are assumed to be in seconds, and are converted into
3064 * Returns 0 on success.
3066 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3067 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3069 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
3070 do_proc_dointvec_jiffies_conv
,NULL
);
3074 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3075 * @table: the sysctl table
3076 * @write: %TRUE if this is a write to the sysctl file
3077 * @buffer: the user buffer
3078 * @lenp: the size of the user buffer
3079 * @ppos: pointer to the file position
3081 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3082 * values from/to the user buffer, treated as an ASCII string.
3083 * The values read are assumed to be in 1/USER_HZ seconds, and
3084 * are converted into jiffies.
3086 * Returns 0 on success.
3088 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3089 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3091 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
3092 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
3096 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3097 * @table: the sysctl table
3098 * @write: %TRUE if this is a write to the sysctl file
3099 * @buffer: the user buffer
3100 * @lenp: the size of the user buffer
3101 * @ppos: file position
3102 * @ppos: the current position in the file
3104 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3105 * values from/to the user buffer, treated as an ASCII string.
3106 * The values read are assumed to be in 1/1000 seconds, and
3107 * are converted into jiffies.
3109 * Returns 0 on success.
3111 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3112 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3114 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
3115 do_proc_dointvec_ms_jiffies_conv
, NULL
);
3118 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
3119 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3121 struct pid
*new_pid
;
3125 tmp
= pid_vnr(cad_pid
);
3127 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
3128 lenp
, ppos
, NULL
, NULL
);
3132 new_pid
= find_get_pid(tmp
);
3136 put_pid(xchg(&cad_pid
, new_pid
));
3141 * proc_do_large_bitmap - read/write from/to a large bitmap
3142 * @table: the sysctl table
3143 * @write: %TRUE if this is a write to the sysctl file
3144 * @buffer: the user buffer
3145 * @lenp: the size of the user buffer
3146 * @ppos: file position
3148 * The bitmap is stored at table->data and the bitmap length (in bits)
3151 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3152 * large bitmaps may be represented in a compact manner. Writing into
3153 * the file will clear the bitmap then update it with the given input.
3155 * Returns 0 on success.
3157 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
3158 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3162 size_t left
= *lenp
;
3163 unsigned long bitmap_len
= table
->maxlen
;
3164 unsigned long *bitmap
= *(unsigned long **) table
->data
;
3165 unsigned long *tmp_bitmap
= NULL
;
3166 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
3168 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
3177 if (left
> PAGE_SIZE
- 1) {
3178 left
= PAGE_SIZE
- 1;
3179 /* How much of the buffer we'll skip this pass */
3180 skipped
= *lenp
- left
;
3183 p
= kbuf
= memdup_user_nul(buffer
, left
);
3185 return PTR_ERR(kbuf
);
3187 tmp_bitmap
= bitmap_zalloc(bitmap_len
, GFP_KERNEL
);
3192 proc_skip_char(&p
, &left
, '\n');
3193 while (!err
&& left
) {
3194 unsigned long val_a
, val_b
;
3198 /* In case we stop parsing mid-number, we can reset */
3200 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
3203 * If we consumed the entirety of a truncated buffer or
3204 * only one char is left (may be a "-"), then stop here,
3205 * reset, & come back for more.
3207 if ((left
<= 1) && skipped
) {
3214 if (val_a
>= bitmap_len
|| neg
) {
3226 err
= proc_get_long(&p
, &left
, &val_b
,
3227 &neg
, tr_b
, sizeof(tr_b
),
3230 * If we consumed all of a truncated buffer or
3231 * then stop here, reset, & come back for more.
3233 if (!left
&& skipped
) {
3240 if (val_b
>= bitmap_len
|| neg
||
3251 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
3253 proc_skip_char(&p
, &left
, '\n');
3258 unsigned long bit_a
, bit_b
= 0;
3261 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
3262 if (bit_a
>= bitmap_len
)
3264 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
3268 err
= proc_put_char(&buffer
, &left
, ',');
3272 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
3275 if (bit_a
!= bit_b
) {
3276 err
= proc_put_char(&buffer
, &left
, '-');
3279 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
3287 err
= proc_put_char(&buffer
, &left
, '\n');
3293 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
3295 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3301 bitmap_free(tmp_bitmap
);
3305 #else /* CONFIG_PROC_SYSCTL */
3307 int proc_dostring(struct ctl_table
*table
, int write
,
3308 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3313 int proc_dointvec(struct ctl_table
*table
, int write
,
3314 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3319 int proc_douintvec(struct ctl_table
*table
, int write
,
3320 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3325 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3326 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3331 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
3332 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3337 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3338 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3343 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3344 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3349 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3350 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3355 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3356 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3361 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3362 void __user
*buffer
,
3363 size_t *lenp
, loff_t
*ppos
)
3368 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
3369 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3374 #endif /* CONFIG_PROC_SYSCTL */
3376 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
3377 static int proc_dointvec_minmax_bpf_stats(struct ctl_table
*table
, int write
,
3378 void __user
*buffer
, size_t *lenp
,
3381 int ret
, bpf_stats
= *(int *)table
->data
;
3382 struct ctl_table tmp
= *table
;
3384 if (write
&& !capable(CAP_SYS_ADMIN
))
3387 tmp
.data
= &bpf_stats
;
3388 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
3389 if (write
&& !ret
) {
3390 *(int *)table
->data
= bpf_stats
;
3392 static_branch_enable(&bpf_stats_enabled_key
);
3394 static_branch_disable(&bpf_stats_enabled_key
);
3400 * No sense putting this after each symbol definition, twice,
3401 * exception granted :-)
3403 EXPORT_SYMBOL(proc_dointvec
);
3404 EXPORT_SYMBOL(proc_douintvec
);
3405 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3406 EXPORT_SYMBOL(proc_dointvec_minmax
);
3407 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3408 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3409 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3410 EXPORT_SYMBOL(proc_dostring
);
3411 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3412 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3413 EXPORT_SYMBOL(proc_do_large_bitmap
);