1 // SPDX-License-Identifier: GPL-2.0-only
3 * sysctl.c: General linux system control interface
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
22 #include <linux/module.h>
23 #include <linux/aio.h>
25 #include <linux/swap.h>
26 #include <linux/slab.h>
27 #include <linux/sysctl.h>
28 #include <linux/bitmap.h>
29 #include <linux/signal.h>
30 #include <linux/printk.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/ctype.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/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70 #include <linux/userfaultfd_k.h>
72 #include "../lib/kstrtox.h"
74 #include <linux/uaccess.h>
75 #include <asm/processor.h>
79 #include <asm/stacktrace.h>
83 #include <asm/setup.h>
85 #ifdef CONFIG_BSD_PROCESS_ACCT
86 #include <linux/acct.h>
88 #ifdef CONFIG_RT_MUTEXES
89 #include <linux/rtmutex.h>
91 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
92 #include <linux/lockdep.h>
94 #ifdef CONFIG_CHR_DEV_SG
97 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
98 #include <linux/stackleak.h>
100 #ifdef CONFIG_LOCKUP_DETECTOR
101 #include <linux/nmi.h>
104 #if defined(CONFIG_SYSCTL)
106 /* External variables not in a header file. */
107 extern int suid_dumpable
;
108 #ifdef CONFIG_COREDUMP
109 extern int core_uses_pid
;
110 extern char core_pattern
[];
111 extern unsigned int core_pipe_limit
;
114 extern int pid_max_min
, pid_max_max
;
115 extern int percpu_pagelist_fraction
;
116 extern int latencytop_enabled
;
117 extern unsigned int sysctl_nr_open_min
, sysctl_nr_open_max
;
119 extern int sysctl_nr_trim_pages
;
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty
= 60;
127 static int __maybe_unused neg_one
= -1;
128 static int __maybe_unused two
= 2;
129 static int __maybe_unused four
= 4;
130 static unsigned long zero_ul
;
131 static unsigned long one_ul
= 1;
132 static unsigned long long_max
= LONG_MAX
;
133 static int one_hundred
= 100;
134 static int one_thousand
= 1000;
136 static int ten_thousand
= 10000;
138 #ifdef CONFIG_PERF_EVENTS
139 static int six_hundred_forty_kb
= 640 * 1024;
142 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
143 static unsigned long dirty_bytes_min
= 2 * PAGE_SIZE
;
145 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
146 static int maxolduid
= 65535;
147 static int minolduid
;
149 static int ngroups_max
= NGROUPS_MAX
;
150 static const int cap_last_cap
= CAP_LAST_CAP
;
153 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
154 * and hung_task_check_interval_secs
156 #ifdef CONFIG_DETECT_HUNG_TASK
157 static unsigned long hung_task_timeout_max
= (LONG_MAX
/HZ
);
160 #ifdef CONFIG_INOTIFY_USER
161 #include <linux/inotify.h>
167 extern int pwrsw_enabled
;
170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
171 extern int unaligned_enabled
;
175 extern int unaligned_dump_stack
;
178 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
179 extern int no_unaligned_warning
;
182 #ifdef CONFIG_PROC_SYSCTL
185 * enum sysctl_writes_mode - supported sysctl write modes
187 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
188 * to be written, and multiple writes on the same sysctl file descriptor
189 * will rewrite the sysctl value, regardless of file position. No warning
190 * is issued when the initial position is not 0.
191 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
193 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
194 * file position 0 and the value must be fully contained in the buffer
195 * sent to the write syscall. If dealing with strings respect the file
196 * position, but restrict this to the max length of the buffer, anything
197 * passed the max length will be ignored. Multiple writes will append
200 * These write modes control how current file position affects the behavior of
201 * updating sysctl values through the proc interface on each write.
203 enum sysctl_writes_mode
{
204 SYSCTL_WRITES_LEGACY
= -1,
205 SYSCTL_WRITES_WARN
= 0,
206 SYSCTL_WRITES_STRICT
= 1,
209 static enum sysctl_writes_mode sysctl_writes_strict
= SYSCTL_WRITES_STRICT
;
211 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
212 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
213 static int proc_taint(struct ctl_table
*table
, int write
,
214 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
218 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
219 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
222 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
223 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
224 #ifdef CONFIG_COREDUMP
225 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
226 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
228 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
229 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
231 #ifdef CONFIG_MAGIC_SYSRQ
232 /* Note: sysrq code uses its own private copy */
233 static int __sysrq_enabled
= CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
;
235 static int sysrq_sysctl_handler(struct ctl_table
*table
, int write
,
236 void __user
*buffer
, size_t *lenp
,
241 error
= proc_dointvec(table
, write
, buffer
, lenp
, ppos
);
246 sysrq_toggle_support(__sysrq_enabled
);
253 static struct ctl_table kern_table
[];
254 static struct ctl_table vm_table
[];
255 static struct ctl_table fs_table
[];
256 static struct ctl_table debug_table
[];
257 static struct ctl_table dev_table
[];
258 extern struct ctl_table random_table
[];
260 extern struct ctl_table epoll_table
[];
263 #ifdef CONFIG_FW_LOADER_USER_HELPER
264 extern struct ctl_table firmware_config_table
[];
267 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
268 int sysctl_legacy_va_layout
;
271 /* The default sysctl tables: */
273 static struct ctl_table sysctl_base_table
[] = {
275 .procname
= "kernel",
292 .child
= debug_table
,
302 #ifdef CONFIG_SCHED_DEBUG
303 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
304 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
305 static int min_wakeup_granularity_ns
; /* 0 usecs */
306 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
308 static int min_sched_tunable_scaling
= SCHED_TUNABLESCALING_NONE
;
309 static int max_sched_tunable_scaling
= SCHED_TUNABLESCALING_END
-1;
310 #endif /* CONFIG_SMP */
311 #endif /* CONFIG_SCHED_DEBUG */
313 #ifdef CONFIG_COMPACTION
314 static int min_extfrag_threshold
;
315 static int max_extfrag_threshold
= 1000;
318 static struct ctl_table kern_table
[] = {
320 .procname
= "sched_child_runs_first",
321 .data
= &sysctl_sched_child_runs_first
,
322 .maxlen
= sizeof(unsigned int),
324 .proc_handler
= proc_dointvec
,
326 #ifdef CONFIG_SCHED_DEBUG
328 .procname
= "sched_min_granularity_ns",
329 .data
= &sysctl_sched_min_granularity
,
330 .maxlen
= sizeof(unsigned int),
332 .proc_handler
= sched_proc_update_handler
,
333 .extra1
= &min_sched_granularity_ns
,
334 .extra2
= &max_sched_granularity_ns
,
337 .procname
= "sched_latency_ns",
338 .data
= &sysctl_sched_latency
,
339 .maxlen
= sizeof(unsigned int),
341 .proc_handler
= sched_proc_update_handler
,
342 .extra1
= &min_sched_granularity_ns
,
343 .extra2
= &max_sched_granularity_ns
,
346 .procname
= "sched_wakeup_granularity_ns",
347 .data
= &sysctl_sched_wakeup_granularity
,
348 .maxlen
= sizeof(unsigned int),
350 .proc_handler
= sched_proc_update_handler
,
351 .extra1
= &min_wakeup_granularity_ns
,
352 .extra2
= &max_wakeup_granularity_ns
,
356 .procname
= "sched_tunable_scaling",
357 .data
= &sysctl_sched_tunable_scaling
,
358 .maxlen
= sizeof(enum sched_tunable_scaling
),
360 .proc_handler
= sched_proc_update_handler
,
361 .extra1
= &min_sched_tunable_scaling
,
362 .extra2
= &max_sched_tunable_scaling
,
365 .procname
= "sched_migration_cost_ns",
366 .data
= &sysctl_sched_migration_cost
,
367 .maxlen
= sizeof(unsigned int),
369 .proc_handler
= proc_dointvec
,
372 .procname
= "sched_nr_migrate",
373 .data
= &sysctl_sched_nr_migrate
,
374 .maxlen
= sizeof(unsigned int),
376 .proc_handler
= proc_dointvec
,
378 #ifdef CONFIG_SCHEDSTATS
380 .procname
= "sched_schedstats",
382 .maxlen
= sizeof(unsigned int),
384 .proc_handler
= sysctl_schedstats
,
385 .extra1
= SYSCTL_ZERO
,
386 .extra2
= SYSCTL_ONE
,
388 #endif /* CONFIG_SCHEDSTATS */
389 #endif /* CONFIG_SMP */
390 #ifdef CONFIG_NUMA_BALANCING
392 .procname
= "numa_balancing_scan_delay_ms",
393 .data
= &sysctl_numa_balancing_scan_delay
,
394 .maxlen
= sizeof(unsigned int),
396 .proc_handler
= proc_dointvec
,
399 .procname
= "numa_balancing_scan_period_min_ms",
400 .data
= &sysctl_numa_balancing_scan_period_min
,
401 .maxlen
= sizeof(unsigned int),
403 .proc_handler
= proc_dointvec
,
406 .procname
= "numa_balancing_scan_period_max_ms",
407 .data
= &sysctl_numa_balancing_scan_period_max
,
408 .maxlen
= sizeof(unsigned int),
410 .proc_handler
= proc_dointvec
,
413 .procname
= "numa_balancing_scan_size_mb",
414 .data
= &sysctl_numa_balancing_scan_size
,
415 .maxlen
= sizeof(unsigned int),
417 .proc_handler
= proc_dointvec_minmax
,
418 .extra1
= SYSCTL_ONE
,
421 .procname
= "numa_balancing",
422 .data
= NULL
, /* filled in by handler */
423 .maxlen
= sizeof(unsigned int),
425 .proc_handler
= sysctl_numa_balancing
,
426 .extra1
= SYSCTL_ZERO
,
427 .extra2
= SYSCTL_ONE
,
429 #endif /* CONFIG_NUMA_BALANCING */
430 #endif /* CONFIG_SCHED_DEBUG */
432 .procname
= "sched_rt_period_us",
433 .data
= &sysctl_sched_rt_period
,
434 .maxlen
= sizeof(unsigned int),
436 .proc_handler
= sched_rt_handler
,
439 .procname
= "sched_rt_runtime_us",
440 .data
= &sysctl_sched_rt_runtime
,
441 .maxlen
= sizeof(int),
443 .proc_handler
= sched_rt_handler
,
446 .procname
= "sched_rr_timeslice_ms",
447 .data
= &sysctl_sched_rr_timeslice
,
448 .maxlen
= sizeof(int),
450 .proc_handler
= sched_rr_handler
,
452 #ifdef CONFIG_UCLAMP_TASK
454 .procname
= "sched_util_clamp_min",
455 .data
= &sysctl_sched_uclamp_util_min
,
456 .maxlen
= sizeof(unsigned int),
458 .proc_handler
= sysctl_sched_uclamp_handler
,
461 .procname
= "sched_util_clamp_max",
462 .data
= &sysctl_sched_uclamp_util_max
,
463 .maxlen
= sizeof(unsigned int),
465 .proc_handler
= sysctl_sched_uclamp_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
,
475 .extra1
= SYSCTL_ZERO
,
476 .extra2
= SYSCTL_ONE
,
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
,
486 .extra1
= SYSCTL_ONE
,
489 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
491 .procname
= "sched_energy_aware",
492 .data
= &sysctl_sched_energy_aware
,
493 .maxlen
= sizeof(unsigned int),
495 .proc_handler
= sched_energy_aware_handler
,
496 .extra1
= SYSCTL_ZERO
,
497 .extra2
= SYSCTL_ONE
,
500 #ifdef CONFIG_PROVE_LOCKING
502 .procname
= "prove_locking",
503 .data
= &prove_locking
,
504 .maxlen
= sizeof(int),
506 .proc_handler
= proc_dointvec
,
509 #ifdef CONFIG_LOCK_STAT
511 .procname
= "lock_stat",
513 .maxlen
= sizeof(int),
515 .proc_handler
= proc_dointvec
,
520 .data
= &panic_timeout
,
521 .maxlen
= sizeof(int),
523 .proc_handler
= proc_dointvec
,
525 #ifdef CONFIG_COREDUMP
527 .procname
= "core_uses_pid",
528 .data
= &core_uses_pid
,
529 .maxlen
= sizeof(int),
531 .proc_handler
= proc_dointvec
,
534 .procname
= "core_pattern",
535 .data
= core_pattern
,
536 .maxlen
= CORENAME_MAX_SIZE
,
538 .proc_handler
= proc_dostring_coredump
,
541 .procname
= "core_pipe_limit",
542 .data
= &core_pipe_limit
,
543 .maxlen
= sizeof(unsigned int),
545 .proc_handler
= proc_dointvec
,
548 #ifdef CONFIG_PROC_SYSCTL
550 .procname
= "tainted",
551 .maxlen
= sizeof(long),
553 .proc_handler
= proc_taint
,
556 .procname
= "sysctl_writes_strict",
557 .data
= &sysctl_writes_strict
,
558 .maxlen
= sizeof(int),
560 .proc_handler
= proc_dointvec_minmax
,
562 .extra2
= SYSCTL_ONE
,
565 #ifdef CONFIG_LATENCYTOP
567 .procname
= "latencytop",
568 .data
= &latencytop_enabled
,
569 .maxlen
= sizeof(int),
571 .proc_handler
= sysctl_latencytop
,
574 #ifdef CONFIG_BLK_DEV_INITRD
576 .procname
= "real-root-dev",
577 .data
= &real_root_dev
,
578 .maxlen
= sizeof(int),
580 .proc_handler
= proc_dointvec
,
584 .procname
= "print-fatal-signals",
585 .data
= &print_fatal_signals
,
586 .maxlen
= sizeof(int),
588 .proc_handler
= proc_dointvec
,
592 .procname
= "reboot-cmd",
593 .data
= reboot_command
,
596 .proc_handler
= proc_dostring
,
599 .procname
= "stop-a",
600 .data
= &stop_a_enabled
,
601 .maxlen
= sizeof (int),
603 .proc_handler
= proc_dointvec
,
606 .procname
= "scons-poweroff",
607 .data
= &scons_pwroff
,
608 .maxlen
= sizeof (int),
610 .proc_handler
= proc_dointvec
,
613 #ifdef CONFIG_SPARC64
615 .procname
= "tsb-ratio",
616 .data
= &sysctl_tsb_ratio
,
617 .maxlen
= sizeof (int),
619 .proc_handler
= proc_dointvec
,
624 .procname
= "soft-power",
625 .data
= &pwrsw_enabled
,
626 .maxlen
= sizeof (int),
628 .proc_handler
= proc_dointvec
,
631 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
633 .procname
= "unaligned-trap",
634 .data
= &unaligned_enabled
,
635 .maxlen
= sizeof (int),
637 .proc_handler
= proc_dointvec
,
641 .procname
= "ctrl-alt-del",
643 .maxlen
= sizeof(int),
645 .proc_handler
= proc_dointvec
,
647 #ifdef CONFIG_FUNCTION_TRACER
649 .procname
= "ftrace_enabled",
650 .data
= &ftrace_enabled
,
651 .maxlen
= sizeof(int),
653 .proc_handler
= ftrace_enable_sysctl
,
656 #ifdef CONFIG_STACK_TRACER
658 .procname
= "stack_tracer_enabled",
659 .data
= &stack_tracer_enabled
,
660 .maxlen
= sizeof(int),
662 .proc_handler
= stack_trace_sysctl
,
665 #ifdef CONFIG_TRACING
667 .procname
= "ftrace_dump_on_oops",
668 .data
= &ftrace_dump_on_oops
,
669 .maxlen
= sizeof(int),
671 .proc_handler
= proc_dointvec
,
674 .procname
= "traceoff_on_warning",
675 .data
= &__disable_trace_on_warning
,
676 .maxlen
= sizeof(__disable_trace_on_warning
),
678 .proc_handler
= proc_dointvec
,
681 .procname
= "tracepoint_printk",
682 .data
= &tracepoint_printk
,
683 .maxlen
= sizeof(tracepoint_printk
),
685 .proc_handler
= tracepoint_printk_sysctl
,
688 #ifdef CONFIG_KEXEC_CORE
690 .procname
= "kexec_load_disabled",
691 .data
= &kexec_load_disabled
,
692 .maxlen
= sizeof(int),
694 /* only handle a transition from default "0" to "1" */
695 .proc_handler
= proc_dointvec_minmax
,
696 .extra1
= SYSCTL_ONE
,
697 .extra2
= SYSCTL_ONE
,
700 #ifdef CONFIG_MODULES
702 .procname
= "modprobe",
703 .data
= &modprobe_path
,
704 .maxlen
= KMOD_PATH_LEN
,
706 .proc_handler
= proc_dostring
,
709 .procname
= "modules_disabled",
710 .data
= &modules_disabled
,
711 .maxlen
= sizeof(int),
713 /* only handle a transition from default "0" to "1" */
714 .proc_handler
= proc_dointvec_minmax
,
715 .extra1
= SYSCTL_ONE
,
716 .extra2
= SYSCTL_ONE
,
719 #ifdef CONFIG_UEVENT_HELPER
721 .procname
= "hotplug",
722 .data
= &uevent_helper
,
723 .maxlen
= UEVENT_HELPER_PATH_LEN
,
725 .proc_handler
= proc_dostring
,
728 #ifdef CONFIG_CHR_DEV_SG
730 .procname
= "sg-big-buff",
731 .data
= &sg_big_buff
,
732 .maxlen
= sizeof (int),
734 .proc_handler
= proc_dointvec
,
737 #ifdef CONFIG_BSD_PROCESS_ACCT
741 .maxlen
= 3*sizeof(int),
743 .proc_handler
= proc_dointvec
,
746 #ifdef CONFIG_MAGIC_SYSRQ
749 .data
= &__sysrq_enabled
,
750 .maxlen
= sizeof (int),
752 .proc_handler
= sysrq_sysctl_handler
,
755 #ifdef CONFIG_PROC_SYSCTL
757 .procname
= "cad_pid",
759 .maxlen
= sizeof (int),
761 .proc_handler
= proc_do_cad_pid
,
765 .procname
= "threads-max",
767 .maxlen
= sizeof(int),
769 .proc_handler
= sysctl_max_threads
,
772 .procname
= "random",
774 .child
= random_table
,
777 .procname
= "usermodehelper",
779 .child
= usermodehelper_table
,
781 #ifdef CONFIG_FW_LOADER_USER_HELPER
783 .procname
= "firmware_config",
785 .child
= firmware_config_table
,
789 .procname
= "overflowuid",
790 .data
= &overflowuid
,
791 .maxlen
= sizeof(int),
793 .proc_handler
= proc_dointvec_minmax
,
794 .extra1
= &minolduid
,
795 .extra2
= &maxolduid
,
798 .procname
= "overflowgid",
799 .data
= &overflowgid
,
800 .maxlen
= sizeof(int),
802 .proc_handler
= proc_dointvec_minmax
,
803 .extra1
= &minolduid
,
804 .extra2
= &maxolduid
,
807 #ifdef CONFIG_MATHEMU
809 .procname
= "ieee_emulation_warnings",
810 .data
= &sysctl_ieee_emulation_warnings
,
811 .maxlen
= sizeof(int),
813 .proc_handler
= proc_dointvec
,
817 .procname
= "userprocess_debug",
818 .data
= &show_unhandled_signals
,
819 .maxlen
= sizeof(int),
821 .proc_handler
= proc_dointvec
,
825 .procname
= "pid_max",
827 .maxlen
= sizeof (int),
829 .proc_handler
= proc_dointvec_minmax
,
830 .extra1
= &pid_max_min
,
831 .extra2
= &pid_max_max
,
834 .procname
= "panic_on_oops",
835 .data
= &panic_on_oops
,
836 .maxlen
= sizeof(int),
838 .proc_handler
= proc_dointvec
,
841 .procname
= "panic_print",
842 .data
= &panic_print
,
843 .maxlen
= sizeof(unsigned long),
845 .proc_handler
= proc_doulongvec_minmax
,
847 #if defined CONFIG_PRINTK
849 .procname
= "printk",
850 .data
= &console_loglevel
,
851 .maxlen
= 4*sizeof(int),
853 .proc_handler
= proc_dointvec
,
856 .procname
= "printk_ratelimit",
857 .data
= &printk_ratelimit_state
.interval
,
858 .maxlen
= sizeof(int),
860 .proc_handler
= proc_dointvec_jiffies
,
863 .procname
= "printk_ratelimit_burst",
864 .data
= &printk_ratelimit_state
.burst
,
865 .maxlen
= sizeof(int),
867 .proc_handler
= proc_dointvec
,
870 .procname
= "printk_delay",
871 .data
= &printk_delay_msec
,
872 .maxlen
= sizeof(int),
874 .proc_handler
= proc_dointvec_minmax
,
875 .extra1
= SYSCTL_ZERO
,
876 .extra2
= &ten_thousand
,
879 .procname
= "printk_devkmsg",
880 .data
= devkmsg_log_str
,
881 .maxlen
= DEVKMSG_STR_MAX_SIZE
,
883 .proc_handler
= devkmsg_sysctl_set_loglvl
,
886 .procname
= "dmesg_restrict",
887 .data
= &dmesg_restrict
,
888 .maxlen
= sizeof(int),
890 .proc_handler
= proc_dointvec_minmax_sysadmin
,
891 .extra1
= SYSCTL_ZERO
,
892 .extra2
= SYSCTL_ONE
,
895 .procname
= "kptr_restrict",
896 .data
= &kptr_restrict
,
897 .maxlen
= sizeof(int),
899 .proc_handler
= proc_dointvec_minmax_sysadmin
,
900 .extra1
= SYSCTL_ZERO
,
905 .procname
= "ngroups_max",
906 .data
= &ngroups_max
,
907 .maxlen
= sizeof (int),
909 .proc_handler
= proc_dointvec
,
912 .procname
= "cap_last_cap",
913 .data
= (void *)&cap_last_cap
,
914 .maxlen
= sizeof(int),
916 .proc_handler
= proc_dointvec
,
918 #if defined(CONFIG_LOCKUP_DETECTOR)
920 .procname
= "watchdog",
921 .data
= &watchdog_user_enabled
,
922 .maxlen
= sizeof(int),
924 .proc_handler
= proc_watchdog
,
925 .extra1
= SYSCTL_ZERO
,
926 .extra2
= SYSCTL_ONE
,
929 .procname
= "watchdog_thresh",
930 .data
= &watchdog_thresh
,
931 .maxlen
= sizeof(int),
933 .proc_handler
= proc_watchdog_thresh
,
934 .extra1
= SYSCTL_ZERO
,
938 .procname
= "nmi_watchdog",
939 .data
= &nmi_watchdog_user_enabled
,
940 .maxlen
= sizeof(int),
941 .mode
= NMI_WATCHDOG_SYSCTL_PERM
,
942 .proc_handler
= proc_nmi_watchdog
,
943 .extra1
= SYSCTL_ZERO
,
944 .extra2
= SYSCTL_ONE
,
947 .procname
= "watchdog_cpumask",
948 .data
= &watchdog_cpumask_bits
,
951 .proc_handler
= proc_watchdog_cpumask
,
953 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
955 .procname
= "soft_watchdog",
956 .data
= &soft_watchdog_user_enabled
,
957 .maxlen
= sizeof(int),
959 .proc_handler
= proc_soft_watchdog
,
960 .extra1
= SYSCTL_ZERO
,
961 .extra2
= SYSCTL_ONE
,
964 .procname
= "softlockup_panic",
965 .data
= &softlockup_panic
,
966 .maxlen
= sizeof(int),
968 .proc_handler
= proc_dointvec_minmax
,
969 .extra1
= SYSCTL_ZERO
,
970 .extra2
= SYSCTL_ONE
,
974 .procname
= "softlockup_all_cpu_backtrace",
975 .data
= &sysctl_softlockup_all_cpu_backtrace
,
976 .maxlen
= sizeof(int),
978 .proc_handler
= proc_dointvec_minmax
,
979 .extra1
= SYSCTL_ZERO
,
980 .extra2
= SYSCTL_ONE
,
982 #endif /* CONFIG_SMP */
984 #ifdef CONFIG_HARDLOCKUP_DETECTOR
986 .procname
= "hardlockup_panic",
987 .data
= &hardlockup_panic
,
988 .maxlen
= sizeof(int),
990 .proc_handler
= proc_dointvec_minmax
,
991 .extra1
= SYSCTL_ZERO
,
992 .extra2
= SYSCTL_ONE
,
996 .procname
= "hardlockup_all_cpu_backtrace",
997 .data
= &sysctl_hardlockup_all_cpu_backtrace
,
998 .maxlen
= sizeof(int),
1000 .proc_handler
= proc_dointvec_minmax
,
1001 .extra1
= SYSCTL_ZERO
,
1002 .extra2
= SYSCTL_ONE
,
1004 #endif /* CONFIG_SMP */
1008 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1010 .procname
= "unknown_nmi_panic",
1011 .data
= &unknown_nmi_panic
,
1012 .maxlen
= sizeof (int),
1014 .proc_handler
= proc_dointvec
,
1017 #if defined(CONFIG_X86)
1019 .procname
= "panic_on_unrecovered_nmi",
1020 .data
= &panic_on_unrecovered_nmi
,
1021 .maxlen
= sizeof(int),
1023 .proc_handler
= proc_dointvec
,
1026 .procname
= "panic_on_io_nmi",
1027 .data
= &panic_on_io_nmi
,
1028 .maxlen
= sizeof(int),
1030 .proc_handler
= proc_dointvec
,
1032 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1034 .procname
= "panic_on_stackoverflow",
1035 .data
= &sysctl_panic_on_stackoverflow
,
1036 .maxlen
= sizeof(int),
1038 .proc_handler
= proc_dointvec
,
1042 .procname
= "bootloader_type",
1043 .data
= &bootloader_type
,
1044 .maxlen
= sizeof (int),
1046 .proc_handler
= proc_dointvec
,
1049 .procname
= "bootloader_version",
1050 .data
= &bootloader_version
,
1051 .maxlen
= sizeof (int),
1053 .proc_handler
= proc_dointvec
,
1056 .procname
= "io_delay_type",
1057 .data
= &io_delay_type
,
1058 .maxlen
= sizeof(int),
1060 .proc_handler
= proc_dointvec
,
1063 #if defined(CONFIG_MMU)
1065 .procname
= "randomize_va_space",
1066 .data
= &randomize_va_space
,
1067 .maxlen
= sizeof(int),
1069 .proc_handler
= proc_dointvec
,
1072 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1074 .procname
= "spin_retry",
1075 .data
= &spin_retry
,
1076 .maxlen
= sizeof (int),
1078 .proc_handler
= proc_dointvec
,
1081 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1083 .procname
= "acpi_video_flags",
1084 .data
= &acpi_realmode_flags
,
1085 .maxlen
= sizeof (unsigned long),
1087 .proc_handler
= proc_doulongvec_minmax
,
1090 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1092 .procname
= "ignore-unaligned-usertrap",
1093 .data
= &no_unaligned_warning
,
1094 .maxlen
= sizeof (int),
1096 .proc_handler
= proc_dointvec
,
1101 .procname
= "unaligned-dump-stack",
1102 .data
= &unaligned_dump_stack
,
1103 .maxlen
= sizeof (int),
1105 .proc_handler
= proc_dointvec
,
1108 #ifdef CONFIG_DETECT_HUNG_TASK
1110 .procname
= "hung_task_panic",
1111 .data
= &sysctl_hung_task_panic
,
1112 .maxlen
= sizeof(int),
1114 .proc_handler
= proc_dointvec_minmax
,
1115 .extra1
= SYSCTL_ZERO
,
1116 .extra2
= SYSCTL_ONE
,
1119 .procname
= "hung_task_check_count",
1120 .data
= &sysctl_hung_task_check_count
,
1121 .maxlen
= sizeof(int),
1123 .proc_handler
= proc_dointvec_minmax
,
1124 .extra1
= SYSCTL_ZERO
,
1127 .procname
= "hung_task_timeout_secs",
1128 .data
= &sysctl_hung_task_timeout_secs
,
1129 .maxlen
= sizeof(unsigned long),
1131 .proc_handler
= proc_dohung_task_timeout_secs
,
1132 .extra2
= &hung_task_timeout_max
,
1135 .procname
= "hung_task_check_interval_secs",
1136 .data
= &sysctl_hung_task_check_interval_secs
,
1137 .maxlen
= sizeof(unsigned long),
1139 .proc_handler
= proc_dohung_task_timeout_secs
,
1140 .extra2
= &hung_task_timeout_max
,
1143 .procname
= "hung_task_warnings",
1144 .data
= &sysctl_hung_task_warnings
,
1145 .maxlen
= sizeof(int),
1147 .proc_handler
= proc_dointvec_minmax
,
1151 #ifdef CONFIG_RT_MUTEXES
1153 .procname
= "max_lock_depth",
1154 .data
= &max_lock_depth
,
1155 .maxlen
= sizeof(int),
1157 .proc_handler
= proc_dointvec
,
1161 .procname
= "poweroff_cmd",
1162 .data
= &poweroff_cmd
,
1163 .maxlen
= POWEROFF_CMD_PATH_LEN
,
1165 .proc_handler
= proc_dostring
,
1171 .child
= key_sysctls
,
1174 #ifdef CONFIG_PERF_EVENTS
1176 * User-space scripts rely on the existence of this file
1177 * as a feature check for perf_events being enabled.
1179 * So it's an ABI, do not remove!
1182 .procname
= "perf_event_paranoid",
1183 .data
= &sysctl_perf_event_paranoid
,
1184 .maxlen
= sizeof(sysctl_perf_event_paranoid
),
1186 .proc_handler
= proc_dointvec
,
1189 .procname
= "perf_event_mlock_kb",
1190 .data
= &sysctl_perf_event_mlock
,
1191 .maxlen
= sizeof(sysctl_perf_event_mlock
),
1193 .proc_handler
= proc_dointvec
,
1196 .procname
= "perf_event_max_sample_rate",
1197 .data
= &sysctl_perf_event_sample_rate
,
1198 .maxlen
= sizeof(sysctl_perf_event_sample_rate
),
1200 .proc_handler
= perf_proc_update_handler
,
1201 .extra1
= SYSCTL_ONE
,
1204 .procname
= "perf_cpu_time_max_percent",
1205 .data
= &sysctl_perf_cpu_time_max_percent
,
1206 .maxlen
= sizeof(sysctl_perf_cpu_time_max_percent
),
1208 .proc_handler
= perf_cpu_time_max_percent_handler
,
1209 .extra1
= SYSCTL_ZERO
,
1210 .extra2
= &one_hundred
,
1213 .procname
= "perf_event_max_stack",
1214 .data
= &sysctl_perf_event_max_stack
,
1215 .maxlen
= sizeof(sysctl_perf_event_max_stack
),
1217 .proc_handler
= perf_event_max_stack_handler
,
1218 .extra1
= SYSCTL_ZERO
,
1219 .extra2
= &six_hundred_forty_kb
,
1222 .procname
= "perf_event_max_contexts_per_stack",
1223 .data
= &sysctl_perf_event_max_contexts_per_stack
,
1224 .maxlen
= sizeof(sysctl_perf_event_max_contexts_per_stack
),
1226 .proc_handler
= perf_event_max_stack_handler
,
1227 .extra1
= SYSCTL_ZERO
,
1228 .extra2
= &one_thousand
,
1232 .procname
= "panic_on_warn",
1233 .data
= &panic_on_warn
,
1234 .maxlen
= sizeof(int),
1236 .proc_handler
= proc_dointvec_minmax
,
1237 .extra1
= SYSCTL_ZERO
,
1238 .extra2
= SYSCTL_ONE
,
1240 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1242 .procname
= "timer_migration",
1243 .data
= &sysctl_timer_migration
,
1244 .maxlen
= sizeof(unsigned int),
1246 .proc_handler
= timer_migration_handler
,
1247 .extra1
= SYSCTL_ZERO
,
1248 .extra2
= SYSCTL_ONE
,
1251 #ifdef CONFIG_BPF_SYSCALL
1253 .procname
= "unprivileged_bpf_disabled",
1254 .data
= &sysctl_unprivileged_bpf_disabled
,
1255 .maxlen
= sizeof(sysctl_unprivileged_bpf_disabled
),
1257 /* only handle a transition from default "0" to "1" */
1258 .proc_handler
= proc_dointvec_minmax
,
1259 .extra1
= SYSCTL_ONE
,
1260 .extra2
= SYSCTL_ONE
,
1263 .procname
= "bpf_stats_enabled",
1264 .data
= &bpf_stats_enabled_key
.key
,
1265 .maxlen
= sizeof(bpf_stats_enabled_key
),
1267 .proc_handler
= proc_do_static_key
,
1270 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1272 .procname
= "panic_on_rcu_stall",
1273 .data
= &sysctl_panic_on_rcu_stall
,
1274 .maxlen
= sizeof(sysctl_panic_on_rcu_stall
),
1276 .proc_handler
= proc_dointvec_minmax
,
1277 .extra1
= SYSCTL_ZERO
,
1278 .extra2
= SYSCTL_ONE
,
1281 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1283 .procname
= "stack_erasing",
1285 .maxlen
= sizeof(int),
1287 .proc_handler
= stack_erasing_sysctl
,
1288 .extra1
= SYSCTL_ZERO
,
1289 .extra2
= SYSCTL_ONE
,
1295 static struct ctl_table vm_table
[] = {
1297 .procname
= "overcommit_memory",
1298 .data
= &sysctl_overcommit_memory
,
1299 .maxlen
= sizeof(sysctl_overcommit_memory
),
1301 .proc_handler
= proc_dointvec_minmax
,
1302 .extra1
= SYSCTL_ZERO
,
1306 .procname
= "panic_on_oom",
1307 .data
= &sysctl_panic_on_oom
,
1308 .maxlen
= sizeof(sysctl_panic_on_oom
),
1310 .proc_handler
= proc_dointvec_minmax
,
1311 .extra1
= SYSCTL_ZERO
,
1315 .procname
= "oom_kill_allocating_task",
1316 .data
= &sysctl_oom_kill_allocating_task
,
1317 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
1319 .proc_handler
= proc_dointvec
,
1322 .procname
= "oom_dump_tasks",
1323 .data
= &sysctl_oom_dump_tasks
,
1324 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
1326 .proc_handler
= proc_dointvec
,
1329 .procname
= "overcommit_ratio",
1330 .data
= &sysctl_overcommit_ratio
,
1331 .maxlen
= sizeof(sysctl_overcommit_ratio
),
1333 .proc_handler
= overcommit_ratio_handler
,
1336 .procname
= "overcommit_kbytes",
1337 .data
= &sysctl_overcommit_kbytes
,
1338 .maxlen
= sizeof(sysctl_overcommit_kbytes
),
1340 .proc_handler
= overcommit_kbytes_handler
,
1343 .procname
= "page-cluster",
1344 .data
= &page_cluster
,
1345 .maxlen
= sizeof(int),
1347 .proc_handler
= proc_dointvec_minmax
,
1348 .extra1
= SYSCTL_ZERO
,
1351 .procname
= "dirty_background_ratio",
1352 .data
= &dirty_background_ratio
,
1353 .maxlen
= sizeof(dirty_background_ratio
),
1355 .proc_handler
= dirty_background_ratio_handler
,
1356 .extra1
= SYSCTL_ZERO
,
1357 .extra2
= &one_hundred
,
1360 .procname
= "dirty_background_bytes",
1361 .data
= &dirty_background_bytes
,
1362 .maxlen
= sizeof(dirty_background_bytes
),
1364 .proc_handler
= dirty_background_bytes_handler
,
1368 .procname
= "dirty_ratio",
1369 .data
= &vm_dirty_ratio
,
1370 .maxlen
= sizeof(vm_dirty_ratio
),
1372 .proc_handler
= dirty_ratio_handler
,
1373 .extra1
= SYSCTL_ZERO
,
1374 .extra2
= &one_hundred
,
1377 .procname
= "dirty_bytes",
1378 .data
= &vm_dirty_bytes
,
1379 .maxlen
= sizeof(vm_dirty_bytes
),
1381 .proc_handler
= dirty_bytes_handler
,
1382 .extra1
= &dirty_bytes_min
,
1385 .procname
= "dirty_writeback_centisecs",
1386 .data
= &dirty_writeback_interval
,
1387 .maxlen
= sizeof(dirty_writeback_interval
),
1389 .proc_handler
= dirty_writeback_centisecs_handler
,
1392 .procname
= "dirty_expire_centisecs",
1393 .data
= &dirty_expire_interval
,
1394 .maxlen
= sizeof(dirty_expire_interval
),
1396 .proc_handler
= proc_dointvec_minmax
,
1397 .extra1
= SYSCTL_ZERO
,
1400 .procname
= "dirtytime_expire_seconds",
1401 .data
= &dirtytime_expire_interval
,
1402 .maxlen
= sizeof(dirtytime_expire_interval
),
1404 .proc_handler
= dirtytime_interval_handler
,
1405 .extra1
= SYSCTL_ZERO
,
1408 .procname
= "swappiness",
1409 .data
= &vm_swappiness
,
1410 .maxlen
= sizeof(vm_swappiness
),
1412 .proc_handler
= proc_dointvec_minmax
,
1413 .extra1
= SYSCTL_ZERO
,
1414 .extra2
= &one_hundred
,
1416 #ifdef CONFIG_HUGETLB_PAGE
1418 .procname
= "nr_hugepages",
1420 .maxlen
= sizeof(unsigned long),
1422 .proc_handler
= hugetlb_sysctl_handler
,
1426 .procname
= "nr_hugepages_mempolicy",
1428 .maxlen
= sizeof(unsigned long),
1430 .proc_handler
= &hugetlb_mempolicy_sysctl_handler
,
1433 .procname
= "numa_stat",
1434 .data
= &sysctl_vm_numa_stat
,
1435 .maxlen
= sizeof(int),
1437 .proc_handler
= sysctl_vm_numa_stat_handler
,
1438 .extra1
= SYSCTL_ZERO
,
1439 .extra2
= SYSCTL_ONE
,
1443 .procname
= "hugetlb_shm_group",
1444 .data
= &sysctl_hugetlb_shm_group
,
1445 .maxlen
= sizeof(gid_t
),
1447 .proc_handler
= proc_dointvec
,
1450 .procname
= "nr_overcommit_hugepages",
1452 .maxlen
= sizeof(unsigned long),
1454 .proc_handler
= hugetlb_overcommit_handler
,
1458 .procname
= "lowmem_reserve_ratio",
1459 .data
= &sysctl_lowmem_reserve_ratio
,
1460 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
1462 .proc_handler
= lowmem_reserve_ratio_sysctl_handler
,
1465 .procname
= "drop_caches",
1466 .data
= &sysctl_drop_caches
,
1467 .maxlen
= sizeof(int),
1469 .proc_handler
= drop_caches_sysctl_handler
,
1470 .extra1
= SYSCTL_ONE
,
1473 #ifdef CONFIG_COMPACTION
1475 .procname
= "compact_memory",
1476 .data
= &sysctl_compact_memory
,
1477 .maxlen
= sizeof(int),
1479 .proc_handler
= sysctl_compaction_handler
,
1482 .procname
= "extfrag_threshold",
1483 .data
= &sysctl_extfrag_threshold
,
1484 .maxlen
= sizeof(int),
1486 .proc_handler
= proc_dointvec_minmax
,
1487 .extra1
= &min_extfrag_threshold
,
1488 .extra2
= &max_extfrag_threshold
,
1491 .procname
= "compact_unevictable_allowed",
1492 .data
= &sysctl_compact_unevictable_allowed
,
1493 .maxlen
= sizeof(int),
1495 .proc_handler
= proc_dointvec
,
1496 .extra1
= SYSCTL_ZERO
,
1497 .extra2
= SYSCTL_ONE
,
1500 #endif /* CONFIG_COMPACTION */
1502 .procname
= "min_free_kbytes",
1503 .data
= &min_free_kbytes
,
1504 .maxlen
= sizeof(min_free_kbytes
),
1506 .proc_handler
= min_free_kbytes_sysctl_handler
,
1507 .extra1
= SYSCTL_ZERO
,
1510 .procname
= "watermark_boost_factor",
1511 .data
= &watermark_boost_factor
,
1512 .maxlen
= sizeof(watermark_boost_factor
),
1514 .proc_handler
= watermark_boost_factor_sysctl_handler
,
1515 .extra1
= SYSCTL_ZERO
,
1518 .procname
= "watermark_scale_factor",
1519 .data
= &watermark_scale_factor
,
1520 .maxlen
= sizeof(watermark_scale_factor
),
1522 .proc_handler
= watermark_scale_factor_sysctl_handler
,
1523 .extra1
= SYSCTL_ONE
,
1524 .extra2
= &one_thousand
,
1527 .procname
= "percpu_pagelist_fraction",
1528 .data
= &percpu_pagelist_fraction
,
1529 .maxlen
= sizeof(percpu_pagelist_fraction
),
1531 .proc_handler
= percpu_pagelist_fraction_sysctl_handler
,
1532 .extra1
= SYSCTL_ZERO
,
1536 .procname
= "max_map_count",
1537 .data
= &sysctl_max_map_count
,
1538 .maxlen
= sizeof(sysctl_max_map_count
),
1540 .proc_handler
= proc_dointvec_minmax
,
1541 .extra1
= SYSCTL_ZERO
,
1545 .procname
= "nr_trim_pages",
1546 .data
= &sysctl_nr_trim_pages
,
1547 .maxlen
= sizeof(sysctl_nr_trim_pages
),
1549 .proc_handler
= proc_dointvec_minmax
,
1550 .extra1
= SYSCTL_ZERO
,
1554 .procname
= "laptop_mode",
1555 .data
= &laptop_mode
,
1556 .maxlen
= sizeof(laptop_mode
),
1558 .proc_handler
= proc_dointvec_jiffies
,
1561 .procname
= "block_dump",
1562 .data
= &block_dump
,
1563 .maxlen
= sizeof(block_dump
),
1565 .proc_handler
= proc_dointvec
,
1566 .extra1
= SYSCTL_ZERO
,
1569 .procname
= "vfs_cache_pressure",
1570 .data
= &sysctl_vfs_cache_pressure
,
1571 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1573 .proc_handler
= proc_dointvec
,
1574 .extra1
= SYSCTL_ZERO
,
1576 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1578 .procname
= "legacy_va_layout",
1579 .data
= &sysctl_legacy_va_layout
,
1580 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1582 .proc_handler
= proc_dointvec
,
1583 .extra1
= SYSCTL_ZERO
,
1588 .procname
= "zone_reclaim_mode",
1589 .data
= &node_reclaim_mode
,
1590 .maxlen
= sizeof(node_reclaim_mode
),
1592 .proc_handler
= proc_dointvec
,
1593 .extra1
= SYSCTL_ZERO
,
1596 .procname
= "min_unmapped_ratio",
1597 .data
= &sysctl_min_unmapped_ratio
,
1598 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1600 .proc_handler
= sysctl_min_unmapped_ratio_sysctl_handler
,
1601 .extra1
= SYSCTL_ZERO
,
1602 .extra2
= &one_hundred
,
1605 .procname
= "min_slab_ratio",
1606 .data
= &sysctl_min_slab_ratio
,
1607 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1609 .proc_handler
= sysctl_min_slab_ratio_sysctl_handler
,
1610 .extra1
= SYSCTL_ZERO
,
1611 .extra2
= &one_hundred
,
1616 .procname
= "stat_interval",
1617 .data
= &sysctl_stat_interval
,
1618 .maxlen
= sizeof(sysctl_stat_interval
),
1620 .proc_handler
= proc_dointvec_jiffies
,
1623 .procname
= "stat_refresh",
1627 .proc_handler
= vmstat_refresh
,
1632 .procname
= "mmap_min_addr",
1633 .data
= &dac_mmap_min_addr
,
1634 .maxlen
= sizeof(unsigned long),
1636 .proc_handler
= mmap_min_addr_handler
,
1641 .procname
= "numa_zonelist_order",
1642 .data
= &numa_zonelist_order
,
1643 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1645 .proc_handler
= numa_zonelist_order_handler
,
1648 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1649 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1651 .procname
= "vdso_enabled",
1652 #ifdef CONFIG_X86_32
1653 .data
= &vdso32_enabled
,
1654 .maxlen
= sizeof(vdso32_enabled
),
1656 .data
= &vdso_enabled
,
1657 .maxlen
= sizeof(vdso_enabled
),
1660 .proc_handler
= proc_dointvec
,
1661 .extra1
= SYSCTL_ZERO
,
1664 #ifdef CONFIG_HIGHMEM
1666 .procname
= "highmem_is_dirtyable",
1667 .data
= &vm_highmem_is_dirtyable
,
1668 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1670 .proc_handler
= proc_dointvec_minmax
,
1671 .extra1
= SYSCTL_ZERO
,
1672 .extra2
= SYSCTL_ONE
,
1675 #ifdef CONFIG_MEMORY_FAILURE
1677 .procname
= "memory_failure_early_kill",
1678 .data
= &sysctl_memory_failure_early_kill
,
1679 .maxlen
= sizeof(sysctl_memory_failure_early_kill
),
1681 .proc_handler
= proc_dointvec_minmax
,
1682 .extra1
= SYSCTL_ZERO
,
1683 .extra2
= SYSCTL_ONE
,
1686 .procname
= "memory_failure_recovery",
1687 .data
= &sysctl_memory_failure_recovery
,
1688 .maxlen
= sizeof(sysctl_memory_failure_recovery
),
1690 .proc_handler
= proc_dointvec_minmax
,
1691 .extra1
= SYSCTL_ZERO
,
1692 .extra2
= SYSCTL_ONE
,
1696 .procname
= "user_reserve_kbytes",
1697 .data
= &sysctl_user_reserve_kbytes
,
1698 .maxlen
= sizeof(sysctl_user_reserve_kbytes
),
1700 .proc_handler
= proc_doulongvec_minmax
,
1703 .procname
= "admin_reserve_kbytes",
1704 .data
= &sysctl_admin_reserve_kbytes
,
1705 .maxlen
= sizeof(sysctl_admin_reserve_kbytes
),
1707 .proc_handler
= proc_doulongvec_minmax
,
1709 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1711 .procname
= "mmap_rnd_bits",
1712 .data
= &mmap_rnd_bits
,
1713 .maxlen
= sizeof(mmap_rnd_bits
),
1715 .proc_handler
= proc_dointvec_minmax
,
1716 .extra1
= (void *)&mmap_rnd_bits_min
,
1717 .extra2
= (void *)&mmap_rnd_bits_max
,
1720 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1722 .procname
= "mmap_rnd_compat_bits",
1723 .data
= &mmap_rnd_compat_bits
,
1724 .maxlen
= sizeof(mmap_rnd_compat_bits
),
1726 .proc_handler
= proc_dointvec_minmax
,
1727 .extra1
= (void *)&mmap_rnd_compat_bits_min
,
1728 .extra2
= (void *)&mmap_rnd_compat_bits_max
,
1731 #ifdef CONFIG_USERFAULTFD
1733 .procname
= "unprivileged_userfaultfd",
1734 .data
= &sysctl_unprivileged_userfaultfd
,
1735 .maxlen
= sizeof(sysctl_unprivileged_userfaultfd
),
1737 .proc_handler
= proc_dointvec_minmax
,
1738 .extra1
= SYSCTL_ZERO
,
1739 .extra2
= SYSCTL_ONE
,
1745 static struct ctl_table fs_table
[] = {
1747 .procname
= "inode-nr",
1748 .data
= &inodes_stat
,
1749 .maxlen
= 2*sizeof(long),
1751 .proc_handler
= proc_nr_inodes
,
1754 .procname
= "inode-state",
1755 .data
= &inodes_stat
,
1756 .maxlen
= 7*sizeof(long),
1758 .proc_handler
= proc_nr_inodes
,
1761 .procname
= "file-nr",
1762 .data
= &files_stat
,
1763 .maxlen
= sizeof(files_stat
),
1765 .proc_handler
= proc_nr_files
,
1768 .procname
= "file-max",
1769 .data
= &files_stat
.max_files
,
1770 .maxlen
= sizeof(files_stat
.max_files
),
1772 .proc_handler
= proc_doulongvec_minmax
,
1774 .extra2
= &long_max
,
1777 .procname
= "nr_open",
1778 .data
= &sysctl_nr_open
,
1779 .maxlen
= sizeof(unsigned int),
1781 .proc_handler
= proc_dointvec_minmax
,
1782 .extra1
= &sysctl_nr_open_min
,
1783 .extra2
= &sysctl_nr_open_max
,
1786 .procname
= "dentry-state",
1787 .data
= &dentry_stat
,
1788 .maxlen
= 6*sizeof(long),
1790 .proc_handler
= proc_nr_dentry
,
1793 .procname
= "overflowuid",
1794 .data
= &fs_overflowuid
,
1795 .maxlen
= sizeof(int),
1797 .proc_handler
= proc_dointvec_minmax
,
1798 .extra1
= &minolduid
,
1799 .extra2
= &maxolduid
,
1802 .procname
= "overflowgid",
1803 .data
= &fs_overflowgid
,
1804 .maxlen
= sizeof(int),
1806 .proc_handler
= proc_dointvec_minmax
,
1807 .extra1
= &minolduid
,
1808 .extra2
= &maxolduid
,
1810 #ifdef CONFIG_FILE_LOCKING
1812 .procname
= "leases-enable",
1813 .data
= &leases_enable
,
1814 .maxlen
= sizeof(int),
1816 .proc_handler
= proc_dointvec
,
1819 #ifdef CONFIG_DNOTIFY
1821 .procname
= "dir-notify-enable",
1822 .data
= &dir_notify_enable
,
1823 .maxlen
= sizeof(int),
1825 .proc_handler
= proc_dointvec
,
1829 #ifdef CONFIG_FILE_LOCKING
1831 .procname
= "lease-break-time",
1832 .data
= &lease_break_time
,
1833 .maxlen
= sizeof(int),
1835 .proc_handler
= proc_dointvec
,
1840 .procname
= "aio-nr",
1842 .maxlen
= sizeof(aio_nr
),
1844 .proc_handler
= proc_doulongvec_minmax
,
1847 .procname
= "aio-max-nr",
1848 .data
= &aio_max_nr
,
1849 .maxlen
= sizeof(aio_max_nr
),
1851 .proc_handler
= proc_doulongvec_minmax
,
1853 #endif /* CONFIG_AIO */
1854 #ifdef CONFIG_INOTIFY_USER
1856 .procname
= "inotify",
1858 .child
= inotify_table
,
1863 .procname
= "epoll",
1865 .child
= epoll_table
,
1870 .procname
= "protected_symlinks",
1871 .data
= &sysctl_protected_symlinks
,
1872 .maxlen
= sizeof(int),
1874 .proc_handler
= proc_dointvec_minmax
,
1875 .extra1
= SYSCTL_ZERO
,
1876 .extra2
= SYSCTL_ONE
,
1879 .procname
= "protected_hardlinks",
1880 .data
= &sysctl_protected_hardlinks
,
1881 .maxlen
= sizeof(int),
1883 .proc_handler
= proc_dointvec_minmax
,
1884 .extra1
= SYSCTL_ZERO
,
1885 .extra2
= SYSCTL_ONE
,
1888 .procname
= "protected_fifos",
1889 .data
= &sysctl_protected_fifos
,
1890 .maxlen
= sizeof(int),
1892 .proc_handler
= proc_dointvec_minmax
,
1893 .extra1
= SYSCTL_ZERO
,
1897 .procname
= "protected_regular",
1898 .data
= &sysctl_protected_regular
,
1899 .maxlen
= sizeof(int),
1901 .proc_handler
= proc_dointvec_minmax
,
1902 .extra1
= SYSCTL_ZERO
,
1906 .procname
= "suid_dumpable",
1907 .data
= &suid_dumpable
,
1908 .maxlen
= sizeof(int),
1910 .proc_handler
= proc_dointvec_minmax_coredump
,
1911 .extra1
= SYSCTL_ZERO
,
1914 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1916 .procname
= "binfmt_misc",
1918 .child
= sysctl_mount_point
,
1922 .procname
= "pipe-max-size",
1923 .data
= &pipe_max_size
,
1924 .maxlen
= sizeof(pipe_max_size
),
1926 .proc_handler
= proc_dopipe_max_size
,
1929 .procname
= "pipe-user-pages-hard",
1930 .data
= &pipe_user_pages_hard
,
1931 .maxlen
= sizeof(pipe_user_pages_hard
),
1933 .proc_handler
= proc_doulongvec_minmax
,
1936 .procname
= "pipe-user-pages-soft",
1937 .data
= &pipe_user_pages_soft
,
1938 .maxlen
= sizeof(pipe_user_pages_soft
),
1940 .proc_handler
= proc_doulongvec_minmax
,
1943 .procname
= "mount-max",
1944 .data
= &sysctl_mount_max
,
1945 .maxlen
= sizeof(unsigned int),
1947 .proc_handler
= proc_dointvec_minmax
,
1948 .extra1
= SYSCTL_ONE
,
1953 static struct ctl_table debug_table
[] = {
1954 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1956 .procname
= "exception-trace",
1957 .data
= &show_unhandled_signals
,
1958 .maxlen
= sizeof(int),
1960 .proc_handler
= proc_dointvec
1963 #if defined(CONFIG_OPTPROBES)
1965 .procname
= "kprobes-optimization",
1966 .data
= &sysctl_kprobes_optimization
,
1967 .maxlen
= sizeof(int),
1969 .proc_handler
= proc_kprobes_optimization_handler
,
1970 .extra1
= SYSCTL_ZERO
,
1971 .extra2
= SYSCTL_ONE
,
1977 static struct ctl_table dev_table
[] = {
1981 int __init
sysctl_init(void)
1983 struct ctl_table_header
*hdr
;
1985 hdr
= register_sysctl_table(sysctl_base_table
);
1986 kmemleak_not_leak(hdr
);
1990 #endif /* CONFIG_SYSCTL */
1996 #ifdef CONFIG_PROC_SYSCTL
1998 static int _proc_do_string(char *data
, int maxlen
, int write
,
1999 char __user
*buffer
,
2000 size_t *lenp
, loff_t
*ppos
)
2006 if (!data
|| !maxlen
|| !*lenp
) {
2012 if (sysctl_writes_strict
== SYSCTL_WRITES_STRICT
) {
2013 /* Only continue writes not past the end of buffer. */
2015 if (len
> maxlen
- 1)
2022 /* Start writing from beginning of buffer. */
2028 while ((p
- buffer
) < *lenp
&& len
< maxlen
- 1) {
2029 if (get_user(c
, p
++))
2031 if (c
== 0 || c
== '\n')
2052 if (copy_to_user(buffer
, data
, len
))
2055 if (put_user('\n', buffer
+ len
))
2065 static void warn_sysctl_write(struct ctl_table
*table
)
2067 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2068 "This will not be supported in the future. To silence this\n"
2069 "warning, set kernel.sysctl_writes_strict = -1\n",
2070 current
->comm
, table
->procname
);
2074 * proc_first_pos_non_zero_ignore - check if first position is allowed
2075 * @ppos: file position
2076 * @table: the sysctl table
2078 * Returns true if the first position is non-zero and the sysctl_writes_strict
2079 * mode indicates this is not allowed for numeric input types. String proc
2080 * handlers can ignore the return value.
2082 static bool proc_first_pos_non_zero_ignore(loff_t
*ppos
,
2083 struct ctl_table
*table
)
2088 switch (sysctl_writes_strict
) {
2089 case SYSCTL_WRITES_STRICT
:
2091 case SYSCTL_WRITES_WARN
:
2092 warn_sysctl_write(table
);
2100 * proc_dostring - read a string sysctl
2101 * @table: the sysctl table
2102 * @write: %TRUE if this is a write to the sysctl file
2103 * @buffer: the user buffer
2104 * @lenp: the size of the user buffer
2105 * @ppos: file position
2107 * Reads/writes a string from/to the user buffer. If the kernel
2108 * buffer provided is not large enough to hold the string, the
2109 * string is truncated. The copied string is %NULL-terminated.
2110 * If the string is being read by the user process, it is copied
2111 * and a newline '\n' is added. It is truncated if the buffer is
2114 * Returns 0 on success.
2116 int proc_dostring(struct ctl_table
*table
, int write
,
2117 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2120 proc_first_pos_non_zero_ignore(ppos
, table
);
2122 return _proc_do_string((char *)(table
->data
), table
->maxlen
, write
,
2123 (char __user
*)buffer
, lenp
, ppos
);
2126 static size_t proc_skip_spaces(char **buf
)
2129 char *tmp
= skip_spaces(*buf
);
2135 static void proc_skip_char(char **buf
, size_t *size
, const char v
)
2146 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2149 * @cp: kernel buffer containing the string to parse
2150 * @endp: pointer to store the trailing characters
2151 * @base: the base to use
2152 * @res: where the parsed integer will be stored
2154 * In case of success 0 is returned and @res will contain the parsed integer,
2155 * @endp will hold any trailing characters.
2156 * This function will fail the parse on overflow. If there wasn't an overflow
2157 * the function will defer the decision what characters count as invalid to the
2160 static int strtoul_lenient(const char *cp
, char **endp
, unsigned int base
,
2163 unsigned long long result
;
2166 cp
= _parse_integer_fixup_radix(cp
, &base
);
2167 rv
= _parse_integer(cp
, base
, &result
);
2168 if ((rv
& KSTRTOX_OVERFLOW
) || (result
!= (unsigned long)result
))
2176 *res
= (unsigned long)result
;
2180 #define TMPBUFLEN 22
2182 * proc_get_long - reads an ASCII formatted integer from a user buffer
2184 * @buf: a kernel buffer
2185 * @size: size of the kernel buffer
2186 * @val: this is where the number will be stored
2187 * @neg: set to %TRUE if number is negative
2188 * @perm_tr: a vector which contains the allowed trailers
2189 * @perm_tr_len: size of the perm_tr vector
2190 * @tr: pointer to store the trailer character
2192 * In case of success %0 is returned and @buf and @size are updated with
2193 * the amount of bytes read. If @tr is non-NULL and a trailing
2194 * character exists (size is non-zero after returning from this
2195 * function), @tr is updated with the trailing character.
2197 static int proc_get_long(char **buf
, size_t *size
,
2198 unsigned long *val
, bool *neg
,
2199 const char *perm_tr
, unsigned perm_tr_len
, char *tr
)
2202 char *p
, tmp
[TMPBUFLEN
];
2208 if (len
> TMPBUFLEN
- 1)
2209 len
= TMPBUFLEN
- 1;
2211 memcpy(tmp
, *buf
, len
);
2215 if (*p
== '-' && *size
> 1) {
2223 if (strtoul_lenient(p
, &p
, 0, val
))
2228 /* We don't know if the next char is whitespace thus we may accept
2229 * invalid integers (e.g. 1234...a) or two integers instead of one
2230 * (e.g. 123...1). So lets not allow such large numbers. */
2231 if (len
== TMPBUFLEN
- 1)
2234 if (len
< *size
&& perm_tr_len
&& !memchr(perm_tr
, *p
, perm_tr_len
))
2237 if (tr
&& (len
< *size
))
2247 * proc_put_long - converts an integer to a decimal ASCII formatted string
2249 * @buf: the user buffer
2250 * @size: the size of the user buffer
2251 * @val: the integer to be converted
2252 * @neg: sign of the number, %TRUE for negative
2254 * In case of success %0 is returned and @buf and @size are updated with
2255 * the amount of bytes written.
2257 static int proc_put_long(void __user
**buf
, size_t *size
, unsigned long val
,
2261 char tmp
[TMPBUFLEN
], *p
= tmp
;
2263 sprintf(p
, "%s%lu", neg
? "-" : "", val
);
2267 if (copy_to_user(*buf
, tmp
, len
))
2275 static int proc_put_char(void __user
**buf
, size_t *size
, char c
)
2278 char __user
**buffer
= (char __user
**)buf
;
2279 if (put_user(c
, *buffer
))
2281 (*size
)--, (*buffer
)++;
2287 static int do_proc_dointvec_conv(bool *negp
, unsigned long *lvalp
,
2289 int write
, void *data
)
2293 if (*lvalp
> (unsigned long) INT_MAX
+ 1)
2297 if (*lvalp
> (unsigned long) INT_MAX
)
2305 *lvalp
= -(unsigned long)val
;
2308 *lvalp
= (unsigned long)val
;
2314 static int do_proc_douintvec_conv(unsigned long *lvalp
,
2316 int write
, void *data
)
2319 if (*lvalp
> UINT_MAX
)
2323 unsigned int val
= *valp
;
2324 *lvalp
= (unsigned long)val
;
2329 static const char proc_wspace_sep
[] = { ' ', '\t', '\n' };
2331 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2332 int write
, void __user
*buffer
,
2333 size_t *lenp
, loff_t
*ppos
,
2334 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2335 int write
, void *data
),
2338 int *i
, vleft
, first
= 1, err
= 0;
2340 char *kbuf
= NULL
, *p
;
2342 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2347 i
= (int *) tbl_data
;
2348 vleft
= table
->maxlen
/ sizeof(*i
);
2352 conv
= do_proc_dointvec_conv
;
2355 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2358 if (left
> PAGE_SIZE
- 1)
2359 left
= PAGE_SIZE
- 1;
2360 p
= kbuf
= memdup_user_nul(buffer
, left
);
2362 return PTR_ERR(kbuf
);
2365 for (; left
&& vleft
--; i
++, first
=0) {
2370 left
-= proc_skip_spaces(&p
);
2374 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2376 sizeof(proc_wspace_sep
), NULL
);
2379 if (conv(&neg
, &lval
, i
, 1, data
)) {
2384 if (conv(&neg
, &lval
, i
, 0, data
)) {
2389 err
= proc_put_char(&buffer
, &left
, '\t');
2392 err
= proc_put_long(&buffer
, &left
, lval
, neg
);
2398 if (!write
&& !first
&& left
&& !err
)
2399 err
= proc_put_char(&buffer
, &left
, '\n');
2400 if (write
&& !err
&& left
)
2401 left
-= proc_skip_spaces(&p
);
2405 return err
? : -EINVAL
;
2413 static int do_proc_dointvec(struct ctl_table
*table
, int write
,
2414 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2415 int (*conv
)(bool *negp
, unsigned long *lvalp
, int *valp
,
2416 int write
, void *data
),
2419 return __do_proc_dointvec(table
->data
, table
, write
,
2420 buffer
, lenp
, ppos
, conv
, data
);
2423 static int do_proc_douintvec_w(unsigned int *tbl_data
,
2424 struct ctl_table
*table
,
2425 void __user
*buffer
,
2426 size_t *lenp
, loff_t
*ppos
,
2427 int (*conv
)(unsigned long *lvalp
,
2429 int write
, void *data
),
2436 char *kbuf
= NULL
, *p
;
2440 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2443 if (left
> PAGE_SIZE
- 1)
2444 left
= PAGE_SIZE
- 1;
2446 p
= kbuf
= memdup_user_nul(buffer
, left
);
2450 left
-= proc_skip_spaces(&p
);
2456 err
= proc_get_long(&p
, &left
, &lval
, &neg
,
2458 sizeof(proc_wspace_sep
), NULL
);
2464 if (conv(&lval
, tbl_data
, 1, data
)) {
2470 left
-= proc_skip_spaces(&p
);
2479 /* This is in keeping with old __do_proc_dointvec() */
2485 static int do_proc_douintvec_r(unsigned int *tbl_data
, void __user
*buffer
,
2486 size_t *lenp
, loff_t
*ppos
,
2487 int (*conv
)(unsigned long *lvalp
,
2489 int write
, void *data
),
2498 if (conv(&lval
, tbl_data
, 0, data
)) {
2503 err
= proc_put_long(&buffer
, &left
, lval
, false);
2507 err
= proc_put_char(&buffer
, &left
, '\n');
2516 static int __do_proc_douintvec(void *tbl_data
, struct ctl_table
*table
,
2517 int write
, void __user
*buffer
,
2518 size_t *lenp
, loff_t
*ppos
,
2519 int (*conv
)(unsigned long *lvalp
,
2521 int write
, void *data
),
2524 unsigned int *i
, vleft
;
2526 if (!tbl_data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2531 i
= (unsigned int *) tbl_data
;
2532 vleft
= table
->maxlen
/ sizeof(*i
);
2535 * Arrays are not supported, keep this simple. *Do not* add
2544 conv
= do_proc_douintvec_conv
;
2547 return do_proc_douintvec_w(i
, table
, buffer
, lenp
, ppos
,
2549 return do_proc_douintvec_r(i
, buffer
, lenp
, ppos
, conv
, data
);
2552 static int do_proc_douintvec(struct ctl_table
*table
, int write
,
2553 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2554 int (*conv
)(unsigned long *lvalp
,
2556 int write
, void *data
),
2559 return __do_proc_douintvec(table
->data
, table
, write
,
2560 buffer
, lenp
, ppos
, conv
, data
);
2564 * proc_dointvec - read a vector of integers
2565 * @table: the sysctl table
2566 * @write: %TRUE if this is a write to the sysctl file
2567 * @buffer: the user buffer
2568 * @lenp: the size of the user buffer
2569 * @ppos: file position
2571 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2572 * values from/to the user buffer, treated as an ASCII string.
2574 * Returns 0 on success.
2576 int proc_dointvec(struct ctl_table
*table
, int write
,
2577 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2579 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
, NULL
, NULL
);
2583 * proc_douintvec - read a vector of unsigned integers
2584 * @table: the sysctl table
2585 * @write: %TRUE if this is a write to the sysctl file
2586 * @buffer: the user buffer
2587 * @lenp: the size of the user buffer
2588 * @ppos: file position
2590 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2591 * values from/to the user buffer, treated as an ASCII string.
2593 * Returns 0 on success.
2595 int proc_douintvec(struct ctl_table
*table
, int write
,
2596 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2598 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2599 do_proc_douintvec_conv
, NULL
);
2603 * Taint values can only be increased
2604 * This means we can safely use a temporary.
2606 static int proc_taint(struct ctl_table
*table
, int write
,
2607 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2610 unsigned long tmptaint
= get_taint();
2613 if (write
&& !capable(CAP_SYS_ADMIN
))
2618 err
= proc_doulongvec_minmax(&t
, write
, buffer
, lenp
, ppos
);
2624 * Poor man's atomic or. Not worth adding a primitive
2625 * to everyone's atomic.h for this
2628 for (i
= 0; i
< BITS_PER_LONG
&& tmptaint
>> i
; i
++) {
2629 if ((tmptaint
>> i
) & 1)
2630 add_taint(i
, LOCKDEP_STILL_OK
);
2637 #ifdef CONFIG_PRINTK
2638 static int proc_dointvec_minmax_sysadmin(struct ctl_table
*table
, int write
,
2639 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2641 if (write
&& !capable(CAP_SYS_ADMIN
))
2644 return proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2649 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2650 * @min: pointer to minimum allowable value
2651 * @max: pointer to maximum allowable value
2653 * The do_proc_dointvec_minmax_conv_param structure provides the
2654 * minimum and maximum values for doing range checking for those sysctl
2655 * parameters that use the proc_dointvec_minmax() handler.
2657 struct do_proc_dointvec_minmax_conv_param
{
2662 static int do_proc_dointvec_minmax_conv(bool *negp
, unsigned long *lvalp
,
2664 int write
, void *data
)
2667 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2669 * If writing, first do so via a temporary local int so we can
2670 * bounds-check it before touching *valp.
2672 int *ip
= write
? &tmp
: valp
;
2674 ret
= do_proc_dointvec_conv(negp
, lvalp
, ip
, write
, data
);
2679 if ((param
->min
&& *param
->min
> tmp
) ||
2680 (param
->max
&& *param
->max
< tmp
))
2689 * proc_dointvec_minmax - read a vector of integers with min/max values
2690 * @table: the sysctl table
2691 * @write: %TRUE if this is a write to the sysctl file
2692 * @buffer: the user buffer
2693 * @lenp: the size of the user buffer
2694 * @ppos: file position
2696 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2697 * values from/to the user buffer, treated as an ASCII string.
2699 * This routine will ensure the values are within the range specified by
2700 * table->extra1 (min) and table->extra2 (max).
2702 * Returns 0 on success or -EINVAL on write when the range check fails.
2704 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
2705 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2707 struct do_proc_dointvec_minmax_conv_param param
= {
2708 .min
= (int *) table
->extra1
,
2709 .max
= (int *) table
->extra2
,
2711 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
2712 do_proc_dointvec_minmax_conv
, ¶m
);
2716 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2717 * @min: pointer to minimum allowable value
2718 * @max: pointer to maximum allowable value
2720 * The do_proc_douintvec_minmax_conv_param structure provides the
2721 * minimum and maximum values for doing range checking for those sysctl
2722 * parameters that use the proc_douintvec_minmax() handler.
2724 struct do_proc_douintvec_minmax_conv_param
{
2729 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp
,
2731 int write
, void *data
)
2735 struct do_proc_douintvec_minmax_conv_param
*param
= data
;
2736 /* write via temporary local uint for bounds-checking */
2737 unsigned int *up
= write
? &tmp
: valp
;
2739 ret
= do_proc_douintvec_conv(lvalp
, up
, write
, data
);
2744 if ((param
->min
&& *param
->min
> tmp
) ||
2745 (param
->max
&& *param
->max
< tmp
))
2755 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2756 * @table: the sysctl table
2757 * @write: %TRUE if this is a write to the sysctl file
2758 * @buffer: the user buffer
2759 * @lenp: the size of the user buffer
2760 * @ppos: file position
2762 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2763 * values from/to the user buffer, treated as an ASCII string. Negative
2764 * strings are not allowed.
2766 * This routine will ensure the values are within the range specified by
2767 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2768 * check for UINT_MAX to avoid having to support wrap around uses from
2771 * Returns 0 on success or -ERANGE on write when the range check fails.
2773 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
2774 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2776 struct do_proc_douintvec_minmax_conv_param param
= {
2777 .min
= (unsigned int *) table
->extra1
,
2778 .max
= (unsigned int *) table
->extra2
,
2780 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2781 do_proc_douintvec_minmax_conv
, ¶m
);
2784 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp
,
2786 int write
, void *data
)
2791 val
= round_pipe_size(*lvalp
);
2797 unsigned int val
= *valp
;
2798 *lvalp
= (unsigned long) val
;
2804 static int proc_dopipe_max_size(struct ctl_table
*table
, int write
,
2805 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2807 return do_proc_douintvec(table
, write
, buffer
, lenp
, ppos
,
2808 do_proc_dopipe_max_size_conv
, NULL
);
2811 static void validate_coredump_safety(void)
2813 #ifdef CONFIG_COREDUMP
2814 if (suid_dumpable
== SUID_DUMP_ROOT
&&
2815 core_pattern
[0] != '/' && core_pattern
[0] != '|') {
2817 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2818 "Pipe handler or fully qualified core dump path required.\n"
2819 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2825 static int proc_dointvec_minmax_coredump(struct ctl_table
*table
, int write
,
2826 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2828 int error
= proc_dointvec_minmax(table
, write
, buffer
, lenp
, ppos
);
2830 validate_coredump_safety();
2834 #ifdef CONFIG_COREDUMP
2835 static int proc_dostring_coredump(struct ctl_table
*table
, int write
,
2836 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2838 int error
= proc_dostring(table
, write
, buffer
, lenp
, ppos
);
2840 validate_coredump_safety();
2845 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2846 void __user
*buffer
,
2847 size_t *lenp
, loff_t
*ppos
,
2848 unsigned long convmul
,
2849 unsigned long convdiv
)
2851 unsigned long *i
, *min
, *max
;
2852 int vleft
, first
= 1, err
= 0;
2854 char *kbuf
= NULL
, *p
;
2856 if (!data
|| !table
->maxlen
|| !*lenp
|| (*ppos
&& !write
)) {
2861 i
= (unsigned long *) data
;
2862 min
= (unsigned long *) table
->extra1
;
2863 max
= (unsigned long *) table
->extra2
;
2864 vleft
= table
->maxlen
/ sizeof(unsigned long);
2868 if (proc_first_pos_non_zero_ignore(ppos
, table
))
2871 if (left
> PAGE_SIZE
- 1)
2872 left
= PAGE_SIZE
- 1;
2873 p
= kbuf
= memdup_user_nul(buffer
, left
);
2875 return PTR_ERR(kbuf
);
2878 for (; left
&& vleft
--; i
++, first
= 0) {
2884 left
-= proc_skip_spaces(&p
);
2888 err
= proc_get_long(&p
, &left
, &val
, &neg
,
2890 sizeof(proc_wspace_sep
), NULL
);
2895 val
= convmul
* val
/ convdiv
;
2896 if ((min
&& val
< *min
) || (max
&& val
> *max
)) {
2902 val
= convdiv
* (*i
) / convmul
;
2904 err
= proc_put_char(&buffer
, &left
, '\t');
2908 err
= proc_put_long(&buffer
, &left
, val
, false);
2914 if (!write
&& !first
&& left
&& !err
)
2915 err
= proc_put_char(&buffer
, &left
, '\n');
2917 left
-= proc_skip_spaces(&p
);
2921 return err
? : -EINVAL
;
2929 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2930 void __user
*buffer
,
2931 size_t *lenp
, loff_t
*ppos
,
2932 unsigned long convmul
,
2933 unsigned long convdiv
)
2935 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2936 buffer
, lenp
, ppos
, convmul
, convdiv
);
2940 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2941 * @table: the sysctl table
2942 * @write: %TRUE if this is a write to the sysctl file
2943 * @buffer: the user buffer
2944 * @lenp: the size of the user buffer
2945 * @ppos: file position
2947 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2948 * values from/to the user buffer, treated as an ASCII string.
2950 * This routine will ensure the values are within the range specified by
2951 * table->extra1 (min) and table->extra2 (max).
2953 * Returns 0 on success.
2955 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2956 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2958 return do_proc_doulongvec_minmax(table
, write
, buffer
, lenp
, ppos
, 1l, 1l);
2962 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2963 * @table: the sysctl table
2964 * @write: %TRUE if this is a write to the sysctl file
2965 * @buffer: the user buffer
2966 * @lenp: the size of the user buffer
2967 * @ppos: file position
2969 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2970 * values from/to the user buffer, treated as an ASCII string. The values
2971 * are treated as milliseconds, and converted to jiffies when they are stored.
2973 * This routine will ensure the values are within the range specified by
2974 * table->extra1 (min) and table->extra2 (max).
2976 * Returns 0 on success.
2978 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2979 void __user
*buffer
,
2980 size_t *lenp
, loff_t
*ppos
)
2982 return do_proc_doulongvec_minmax(table
, write
, buffer
,
2983 lenp
, ppos
, HZ
, 1000l);
2987 static int do_proc_dointvec_jiffies_conv(bool *negp
, unsigned long *lvalp
,
2989 int write
, void *data
)
2992 if (*lvalp
> INT_MAX
/ HZ
)
2994 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
3000 lval
= -(unsigned long)val
;
3003 lval
= (unsigned long)val
;
3010 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp
, unsigned long *lvalp
,
3012 int write
, void *data
)
3015 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
3017 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
3023 lval
= -(unsigned long)val
;
3026 lval
= (unsigned long)val
;
3028 *lvalp
= jiffies_to_clock_t(lval
);
3033 static int do_proc_dointvec_ms_jiffies_conv(bool *negp
, unsigned long *lvalp
,
3035 int write
, void *data
)
3038 unsigned long jif
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
3048 lval
= -(unsigned long)val
;
3051 lval
= (unsigned long)val
;
3053 *lvalp
= jiffies_to_msecs(lval
);
3059 * proc_dointvec_jiffies - read a vector of integers as seconds
3060 * @table: the sysctl table
3061 * @write: %TRUE if this is a write to the sysctl file
3062 * @buffer: the user buffer
3063 * @lenp: the size of the user buffer
3064 * @ppos: file position
3066 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3067 * values from/to the user buffer, treated as an ASCII string.
3068 * The values read are assumed to be in seconds, and are converted into
3071 * Returns 0 on success.
3073 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3074 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3076 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
3077 do_proc_dointvec_jiffies_conv
,NULL
);
3081 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3082 * @table: the sysctl table
3083 * @write: %TRUE if this is a write to the sysctl file
3084 * @buffer: the user buffer
3085 * @lenp: the size of the user buffer
3086 * @ppos: pointer to the file position
3088 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3089 * values from/to the user buffer, treated as an ASCII string.
3090 * The values read are assumed to be in 1/USER_HZ seconds, and
3091 * are converted into jiffies.
3093 * Returns 0 on success.
3095 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3096 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3098 return do_proc_dointvec(table
,write
,buffer
,lenp
,ppos
,
3099 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
3103 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3104 * @table: the sysctl table
3105 * @write: %TRUE if this is a write to the sysctl file
3106 * @buffer: the user buffer
3107 * @lenp: the size of the user buffer
3108 * @ppos: file position
3109 * @ppos: the current position in the file
3111 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3112 * values from/to the user buffer, treated as an ASCII string.
3113 * The values read are assumed to be in 1/1000 seconds, and
3114 * are converted into jiffies.
3116 * Returns 0 on success.
3118 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3119 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3121 return do_proc_dointvec(table
, write
, buffer
, lenp
, ppos
,
3122 do_proc_dointvec_ms_jiffies_conv
, NULL
);
3125 static int proc_do_cad_pid(struct ctl_table
*table
, int write
,
3126 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3128 struct pid
*new_pid
;
3132 tmp
= pid_vnr(cad_pid
);
3134 r
= __do_proc_dointvec(&tmp
, table
, write
, buffer
,
3135 lenp
, ppos
, NULL
, NULL
);
3139 new_pid
= find_get_pid(tmp
);
3143 put_pid(xchg(&cad_pid
, new_pid
));
3148 * proc_do_large_bitmap - read/write from/to a large bitmap
3149 * @table: the sysctl table
3150 * @write: %TRUE if this is a write to the sysctl file
3151 * @buffer: the user buffer
3152 * @lenp: the size of the user buffer
3153 * @ppos: file position
3155 * The bitmap is stored at table->data and the bitmap length (in bits)
3158 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3159 * large bitmaps may be represented in a compact manner. Writing into
3160 * the file will clear the bitmap then update it with the given input.
3162 * Returns 0 on success.
3164 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
3165 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3169 size_t left
= *lenp
;
3170 unsigned long bitmap_len
= table
->maxlen
;
3171 unsigned long *bitmap
= *(unsigned long **) table
->data
;
3172 unsigned long *tmp_bitmap
= NULL
;
3173 char tr_a
[] = { '-', ',', '\n' }, tr_b
[] = { ',', '\n', 0 }, c
;
3175 if (!bitmap
|| !bitmap_len
|| !left
|| (*ppos
&& !write
)) {
3184 if (left
> PAGE_SIZE
- 1) {
3185 left
= PAGE_SIZE
- 1;
3186 /* How much of the buffer we'll skip this pass */
3187 skipped
= *lenp
- left
;
3190 p
= kbuf
= memdup_user_nul(buffer
, left
);
3192 return PTR_ERR(kbuf
);
3194 tmp_bitmap
= bitmap_zalloc(bitmap_len
, GFP_KERNEL
);
3199 proc_skip_char(&p
, &left
, '\n');
3200 while (!err
&& left
) {
3201 unsigned long val_a
, val_b
;
3205 /* In case we stop parsing mid-number, we can reset */
3207 err
= proc_get_long(&p
, &left
, &val_a
, &neg
, tr_a
,
3210 * If we consumed the entirety of a truncated buffer or
3211 * only one char is left (may be a "-"), then stop here,
3212 * reset, & come back for more.
3214 if ((left
<= 1) && skipped
) {
3221 if (val_a
>= bitmap_len
|| neg
) {
3233 err
= proc_get_long(&p
, &left
, &val_b
,
3234 &neg
, tr_b
, sizeof(tr_b
),
3237 * If we consumed all of a truncated buffer or
3238 * then stop here, reset, & come back for more.
3240 if (!left
&& skipped
) {
3247 if (val_b
>= bitmap_len
|| neg
||
3258 bitmap_set(tmp_bitmap
, val_a
, val_b
- val_a
+ 1);
3260 proc_skip_char(&p
, &left
, '\n');
3265 unsigned long bit_a
, bit_b
= 0;
3268 bit_a
= find_next_bit(bitmap
, bitmap_len
, bit_b
);
3269 if (bit_a
>= bitmap_len
)
3271 bit_b
= find_next_zero_bit(bitmap
, bitmap_len
,
3275 err
= proc_put_char(&buffer
, &left
, ',');
3279 err
= proc_put_long(&buffer
, &left
, bit_a
, false);
3282 if (bit_a
!= bit_b
) {
3283 err
= proc_put_char(&buffer
, &left
, '-');
3286 err
= proc_put_long(&buffer
, &left
, bit_b
, false);
3294 err
= proc_put_char(&buffer
, &left
, '\n');
3300 bitmap_or(bitmap
, bitmap
, tmp_bitmap
, bitmap_len
);
3302 bitmap_copy(bitmap
, tmp_bitmap
, bitmap_len
);
3308 bitmap_free(tmp_bitmap
);
3312 #else /* CONFIG_PROC_SYSCTL */
3314 int proc_dostring(struct ctl_table
*table
, int write
,
3315 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3320 int proc_dointvec(struct ctl_table
*table
, int write
,
3321 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3326 int proc_douintvec(struct ctl_table
*table
, int write
,
3327 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3332 int proc_dointvec_minmax(struct ctl_table
*table
, int write
,
3333 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3338 int proc_douintvec_minmax(struct ctl_table
*table
, int write
,
3339 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3344 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
,
3345 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3350 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
,
3351 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3356 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
,
3357 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3362 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
3363 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3368 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
3369 void __user
*buffer
,
3370 size_t *lenp
, loff_t
*ppos
)
3375 int proc_do_large_bitmap(struct ctl_table
*table
, int write
,
3376 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3381 #endif /* CONFIG_PROC_SYSCTL */
3383 #if defined(CONFIG_SYSCTL)
3384 int proc_do_static_key(struct ctl_table
*table
, int write
,
3385 void __user
*buffer
, size_t *lenp
,
3388 struct static_key
*key
= (struct static_key
*)table
->data
;
3389 static DEFINE_MUTEX(static_key_mutex
);
3391 struct ctl_table tmp
= {
3393 .maxlen
= sizeof(val
),
3394 .mode
= table
->mode
,
3395 .extra1
= SYSCTL_ZERO
,
3396 .extra2
= SYSCTL_ONE
,
3399 if (write
&& !capable(CAP_SYS_ADMIN
))
3402 mutex_lock(&static_key_mutex
);
3403 val
= static_key_enabled(key
);
3404 ret
= proc_dointvec_minmax(&tmp
, write
, buffer
, lenp
, ppos
);
3405 if (write
&& !ret
) {
3407 static_key_enable(key
);
3409 static_key_disable(key
);
3411 mutex_unlock(&static_key_mutex
);
3416 * No sense putting this after each symbol definition, twice,
3417 * exception granted :-)
3419 EXPORT_SYMBOL(proc_dointvec
);
3420 EXPORT_SYMBOL(proc_douintvec
);
3421 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3422 EXPORT_SYMBOL(proc_dointvec_minmax
);
3423 EXPORT_SYMBOL_GPL(proc_douintvec_minmax
);
3424 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3425 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3426 EXPORT_SYMBOL(proc_dostring
);
3427 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3428 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3429 EXPORT_SYMBOL(proc_do_large_bitmap
);