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;
130 static int __maybe_unused one = 1;
131 static int __maybe_unused two = 2;
132 static int __maybe_unused four = 4;
133 static unsigned long zero_ul;
134 static unsigned long one_ul = 1;
135 static unsigned long long_max = LONG_MAX;
136 static int one_hundred = 100;
137 static int one_thousand = 1000;
139 static int ten_thousand = 10000;
141 #ifdef CONFIG_PERF_EVENTS
142 static int six_hundred_forty_kb = 640 * 1024;
145 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
146 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
148 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
149 static int maxolduid = 65535;
150 static int minolduid;
152 static int ngroups_max = NGROUPS_MAX;
153 static const int cap_last_cap = CAP_LAST_CAP;
156 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
157 * and hung_task_check_interval_secs
159 #ifdef CONFIG_DETECT_HUNG_TASK
160 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
163 #ifdef CONFIG_INOTIFY_USER
164 #include <linux/inotify.h>
170 extern int pwrsw_enabled;
173 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
174 extern int unaligned_enabled;
178 extern int unaligned_dump_stack;
181 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
182 extern int no_unaligned_warning;
185 #ifdef CONFIG_PROC_SYSCTL
188 * enum sysctl_writes_mode - supported sysctl write modes
190 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
191 * to be written, and multiple writes on the same sysctl file descriptor
192 * will rewrite the sysctl value, regardless of file position. No warning
193 * is issued when the initial position is not 0.
194 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
196 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
197 * file position 0 and the value must be fully contained in the buffer
198 * sent to the write syscall. If dealing with strings respect the file
199 * position, but restrict this to the max length of the buffer, anything
200 * passed the max lenght will be ignored. Multiple writes will append
203 * These write modes control how current file position affects the behavior of
204 * updating sysctl values through the proc interface on each write.
206 enum sysctl_writes_mode {
207 SYSCTL_WRITES_LEGACY = -1,
208 SYSCTL_WRITES_WARN = 0,
209 SYSCTL_WRITES_STRICT = 1,
212 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
214 static int proc_do_cad_pid(struct ctl_table *table, int write,
215 void __user *buffer, size_t *lenp, loff_t *ppos);
216 static int proc_taint(struct ctl_table *table, int write,
217 void __user *buffer, size_t *lenp, loff_t *ppos);
221 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
222 void __user *buffer, size_t *lenp, loff_t *ppos);
225 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos);
227 #ifdef CONFIG_COREDUMP
228 static int proc_dostring_coredump(struct ctl_table *table, int write,
229 void __user *buffer, size_t *lenp, loff_t *ppos);
231 static int proc_dopipe_max_size(struct ctl_table *table, int write,
232 void __user *buffer, size_t *lenp, loff_t *ppos);
234 #ifdef CONFIG_MAGIC_SYSRQ
235 /* Note: sysrq code uses its own private copy */
236 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
238 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
239 void __user *buffer, size_t *lenp,
244 error = proc_dointvec(table, write, buffer, lenp, ppos);
249 sysrq_toggle_support(__sysrq_enabled);
256 static struct ctl_table kern_table[];
257 static struct ctl_table vm_table[];
258 static struct ctl_table fs_table[];
259 static struct ctl_table debug_table[];
260 static struct ctl_table dev_table[];
261 extern struct ctl_table random_table[];
263 extern struct ctl_table epoll_table[];
266 #ifdef CONFIG_FW_LOADER_USER_HELPER
267 extern struct ctl_table firmware_config_table[];
270 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
271 int sysctl_legacy_va_layout;
274 /* The default sysctl tables: */
276 static struct ctl_table sysctl_base_table[] = {
278 .procname = "kernel",
295 .child = debug_table,
305 #ifdef CONFIG_SCHED_DEBUG
306 static int min_sched_granularity_ns = 100000; /* 100 usecs */
307 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
308 static int min_wakeup_granularity_ns; /* 0 usecs */
309 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
311 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
312 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
313 #endif /* CONFIG_SMP */
314 #endif /* CONFIG_SCHED_DEBUG */
316 #ifdef CONFIG_COMPACTION
317 static int min_extfrag_threshold;
318 static int max_extfrag_threshold = 1000;
321 static struct ctl_table kern_table[] = {
323 .procname = "sched_child_runs_first",
324 .data = &sysctl_sched_child_runs_first,
325 .maxlen = sizeof(unsigned int),
327 .proc_handler = proc_dointvec,
329 #ifdef CONFIG_SCHED_DEBUG
331 .procname = "sched_min_granularity_ns",
332 .data = &sysctl_sched_min_granularity,
333 .maxlen = sizeof(unsigned int),
335 .proc_handler = sched_proc_update_handler,
336 .extra1 = &min_sched_granularity_ns,
337 .extra2 = &max_sched_granularity_ns,
340 .procname = "sched_latency_ns",
341 .data = &sysctl_sched_latency,
342 .maxlen = sizeof(unsigned int),
344 .proc_handler = sched_proc_update_handler,
345 .extra1 = &min_sched_granularity_ns,
346 .extra2 = &max_sched_granularity_ns,
349 .procname = "sched_wakeup_granularity_ns",
350 .data = &sysctl_sched_wakeup_granularity,
351 .maxlen = sizeof(unsigned int),
353 .proc_handler = sched_proc_update_handler,
354 .extra1 = &min_wakeup_granularity_ns,
355 .extra2 = &max_wakeup_granularity_ns,
359 .procname = "sched_tunable_scaling",
360 .data = &sysctl_sched_tunable_scaling,
361 .maxlen = sizeof(enum sched_tunable_scaling),
363 .proc_handler = sched_proc_update_handler,
364 .extra1 = &min_sched_tunable_scaling,
365 .extra2 = &max_sched_tunable_scaling,
368 .procname = "sched_migration_cost_ns",
369 .data = &sysctl_sched_migration_cost,
370 .maxlen = sizeof(unsigned int),
372 .proc_handler = proc_dointvec,
375 .procname = "sched_nr_migrate",
376 .data = &sysctl_sched_nr_migrate,
377 .maxlen = sizeof(unsigned int),
379 .proc_handler = proc_dointvec,
381 #ifdef CONFIG_SCHEDSTATS
383 .procname = "sched_schedstats",
385 .maxlen = sizeof(unsigned int),
387 .proc_handler = sysctl_schedstats,
391 #endif /* CONFIG_SCHEDSTATS */
392 #endif /* CONFIG_SMP */
393 #ifdef CONFIG_NUMA_BALANCING
395 .procname = "numa_balancing_scan_delay_ms",
396 .data = &sysctl_numa_balancing_scan_delay,
397 .maxlen = sizeof(unsigned int),
399 .proc_handler = proc_dointvec,
402 .procname = "numa_balancing_scan_period_min_ms",
403 .data = &sysctl_numa_balancing_scan_period_min,
404 .maxlen = sizeof(unsigned int),
406 .proc_handler = proc_dointvec,
409 .procname = "numa_balancing_scan_period_max_ms",
410 .data = &sysctl_numa_balancing_scan_period_max,
411 .maxlen = sizeof(unsigned int),
413 .proc_handler = proc_dointvec,
416 .procname = "numa_balancing_scan_size_mb",
417 .data = &sysctl_numa_balancing_scan_size,
418 .maxlen = sizeof(unsigned int),
420 .proc_handler = proc_dointvec_minmax,
424 .procname = "numa_balancing",
425 .data = NULL, /* filled in by handler */
426 .maxlen = sizeof(unsigned int),
428 .proc_handler = sysctl_numa_balancing,
432 #endif /* CONFIG_NUMA_BALANCING */
433 #endif /* CONFIG_SCHED_DEBUG */
435 .procname = "sched_rt_period_us",
436 .data = &sysctl_sched_rt_period,
437 .maxlen = sizeof(unsigned int),
439 .proc_handler = sched_rt_handler,
442 .procname = "sched_rt_runtime_us",
443 .data = &sysctl_sched_rt_runtime,
444 .maxlen = sizeof(int),
446 .proc_handler = sched_rt_handler,
449 .procname = "sched_rr_timeslice_ms",
450 .data = &sysctl_sched_rr_timeslice,
451 .maxlen = sizeof(int),
453 .proc_handler = sched_rr_handler,
455 #ifdef CONFIG_SCHED_AUTOGROUP
457 .procname = "sched_autogroup_enabled",
458 .data = &sysctl_sched_autogroup_enabled,
459 .maxlen = sizeof(unsigned int),
461 .proc_handler = proc_dointvec_minmax,
466 #ifdef CONFIG_CFS_BANDWIDTH
468 .procname = "sched_cfs_bandwidth_slice_us",
469 .data = &sysctl_sched_cfs_bandwidth_slice,
470 .maxlen = sizeof(unsigned int),
472 .proc_handler = proc_dointvec_minmax,
476 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
478 .procname = "sched_energy_aware",
479 .data = &sysctl_sched_energy_aware,
480 .maxlen = sizeof(unsigned int),
482 .proc_handler = sched_energy_aware_handler,
487 #ifdef CONFIG_PROVE_LOCKING
489 .procname = "prove_locking",
490 .data = &prove_locking,
491 .maxlen = sizeof(int),
493 .proc_handler = proc_dointvec,
496 #ifdef CONFIG_LOCK_STAT
498 .procname = "lock_stat",
500 .maxlen = sizeof(int),
502 .proc_handler = proc_dointvec,
507 .data = &panic_timeout,
508 .maxlen = sizeof(int),
510 .proc_handler = proc_dointvec,
512 #ifdef CONFIG_COREDUMP
514 .procname = "core_uses_pid",
515 .data = &core_uses_pid,
516 .maxlen = sizeof(int),
518 .proc_handler = proc_dointvec,
521 .procname = "core_pattern",
522 .data = core_pattern,
523 .maxlen = CORENAME_MAX_SIZE,
525 .proc_handler = proc_dostring_coredump,
528 .procname = "core_pipe_limit",
529 .data = &core_pipe_limit,
530 .maxlen = sizeof(unsigned int),
532 .proc_handler = proc_dointvec,
535 #ifdef CONFIG_PROC_SYSCTL
537 .procname = "tainted",
538 .maxlen = sizeof(long),
540 .proc_handler = proc_taint,
543 .procname = "sysctl_writes_strict",
544 .data = &sysctl_writes_strict,
545 .maxlen = sizeof(int),
547 .proc_handler = proc_dointvec_minmax,
552 #ifdef CONFIG_LATENCYTOP
554 .procname = "latencytop",
555 .data = &latencytop_enabled,
556 .maxlen = sizeof(int),
558 .proc_handler = sysctl_latencytop,
561 #ifdef CONFIG_BLK_DEV_INITRD
563 .procname = "real-root-dev",
564 .data = &real_root_dev,
565 .maxlen = sizeof(int),
567 .proc_handler = proc_dointvec,
571 .procname = "print-fatal-signals",
572 .data = &print_fatal_signals,
573 .maxlen = sizeof(int),
575 .proc_handler = proc_dointvec,
579 .procname = "reboot-cmd",
580 .data = reboot_command,
583 .proc_handler = proc_dostring,
586 .procname = "stop-a",
587 .data = &stop_a_enabled,
588 .maxlen = sizeof (int),
590 .proc_handler = proc_dointvec,
593 .procname = "scons-poweroff",
594 .data = &scons_pwroff,
595 .maxlen = sizeof (int),
597 .proc_handler = proc_dointvec,
600 #ifdef CONFIG_SPARC64
602 .procname = "tsb-ratio",
603 .data = &sysctl_tsb_ratio,
604 .maxlen = sizeof (int),
606 .proc_handler = proc_dointvec,
611 .procname = "soft-power",
612 .data = &pwrsw_enabled,
613 .maxlen = sizeof (int),
615 .proc_handler = proc_dointvec,
618 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
620 .procname = "unaligned-trap",
621 .data = &unaligned_enabled,
622 .maxlen = sizeof (int),
624 .proc_handler = proc_dointvec,
628 .procname = "ctrl-alt-del",
630 .maxlen = sizeof(int),
632 .proc_handler = proc_dointvec,
634 #ifdef CONFIG_FUNCTION_TRACER
636 .procname = "ftrace_enabled",
637 .data = &ftrace_enabled,
638 .maxlen = sizeof(int),
640 .proc_handler = ftrace_enable_sysctl,
643 #ifdef CONFIG_STACK_TRACER
645 .procname = "stack_tracer_enabled",
646 .data = &stack_tracer_enabled,
647 .maxlen = sizeof(int),
649 .proc_handler = stack_trace_sysctl,
652 #ifdef CONFIG_TRACING
654 .procname = "ftrace_dump_on_oops",
655 .data = &ftrace_dump_on_oops,
656 .maxlen = sizeof(int),
658 .proc_handler = proc_dointvec,
661 .procname = "traceoff_on_warning",
662 .data = &__disable_trace_on_warning,
663 .maxlen = sizeof(__disable_trace_on_warning),
665 .proc_handler = proc_dointvec,
668 .procname = "tracepoint_printk",
669 .data = &tracepoint_printk,
670 .maxlen = sizeof(tracepoint_printk),
672 .proc_handler = tracepoint_printk_sysctl,
675 #ifdef CONFIG_KEXEC_CORE
677 .procname = "kexec_load_disabled",
678 .data = &kexec_load_disabled,
679 .maxlen = sizeof(int),
681 /* only handle a transition from default "0" to "1" */
682 .proc_handler = proc_dointvec_minmax,
687 #ifdef CONFIG_MODULES
689 .procname = "modprobe",
690 .data = &modprobe_path,
691 .maxlen = KMOD_PATH_LEN,
693 .proc_handler = proc_dostring,
696 .procname = "modules_disabled",
697 .data = &modules_disabled,
698 .maxlen = sizeof(int),
700 /* only handle a transition from default "0" to "1" */
701 .proc_handler = proc_dointvec_minmax,
706 #ifdef CONFIG_UEVENT_HELPER
708 .procname = "hotplug",
709 .data = &uevent_helper,
710 .maxlen = UEVENT_HELPER_PATH_LEN,
712 .proc_handler = proc_dostring,
715 #ifdef CONFIG_CHR_DEV_SG
717 .procname = "sg-big-buff",
718 .data = &sg_big_buff,
719 .maxlen = sizeof (int),
721 .proc_handler = proc_dointvec,
724 #ifdef CONFIG_BSD_PROCESS_ACCT
728 .maxlen = 3*sizeof(int),
730 .proc_handler = proc_dointvec,
733 #ifdef CONFIG_MAGIC_SYSRQ
736 .data = &__sysrq_enabled,
737 .maxlen = sizeof (int),
739 .proc_handler = sysrq_sysctl_handler,
742 #ifdef CONFIG_PROC_SYSCTL
744 .procname = "cad_pid",
746 .maxlen = sizeof (int),
748 .proc_handler = proc_do_cad_pid,
752 .procname = "threads-max",
754 .maxlen = sizeof(int),
756 .proc_handler = sysctl_max_threads,
759 .procname = "random",
761 .child = random_table,
764 .procname = "usermodehelper",
766 .child = usermodehelper_table,
768 #ifdef CONFIG_FW_LOADER_USER_HELPER
770 .procname = "firmware_config",
772 .child = firmware_config_table,
776 .procname = "overflowuid",
777 .data = &overflowuid,
778 .maxlen = sizeof(int),
780 .proc_handler = proc_dointvec_minmax,
781 .extra1 = &minolduid,
782 .extra2 = &maxolduid,
785 .procname = "overflowgid",
786 .data = &overflowgid,
787 .maxlen = sizeof(int),
789 .proc_handler = proc_dointvec_minmax,
790 .extra1 = &minolduid,
791 .extra2 = &maxolduid,
794 #ifdef CONFIG_MATHEMU
796 .procname = "ieee_emulation_warnings",
797 .data = &sysctl_ieee_emulation_warnings,
798 .maxlen = sizeof(int),
800 .proc_handler = proc_dointvec,
804 .procname = "userprocess_debug",
805 .data = &show_unhandled_signals,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec,
812 .procname = "pid_max",
814 .maxlen = sizeof (int),
816 .proc_handler = proc_dointvec_minmax,
817 .extra1 = &pid_max_min,
818 .extra2 = &pid_max_max,
821 .procname = "panic_on_oops",
822 .data = &panic_on_oops,
823 .maxlen = sizeof(int),
825 .proc_handler = proc_dointvec,
828 .procname = "panic_print",
829 .data = &panic_print,
830 .maxlen = sizeof(unsigned long),
832 .proc_handler = proc_doulongvec_minmax,
834 #if defined CONFIG_PRINTK
836 .procname = "printk",
837 .data = &console_loglevel,
838 .maxlen = 4*sizeof(int),
840 .proc_handler = proc_dointvec,
843 .procname = "printk_ratelimit",
844 .data = &printk_ratelimit_state.interval,
845 .maxlen = sizeof(int),
847 .proc_handler = proc_dointvec_jiffies,
850 .procname = "printk_ratelimit_burst",
851 .data = &printk_ratelimit_state.burst,
852 .maxlen = sizeof(int),
854 .proc_handler = proc_dointvec,
857 .procname = "printk_delay",
858 .data = &printk_delay_msec,
859 .maxlen = sizeof(int),
861 .proc_handler = proc_dointvec_minmax,
863 .extra2 = &ten_thousand,
866 .procname = "printk_devkmsg",
867 .data = devkmsg_log_str,
868 .maxlen = DEVKMSG_STR_MAX_SIZE,
870 .proc_handler = devkmsg_sysctl_set_loglvl,
873 .procname = "dmesg_restrict",
874 .data = &dmesg_restrict,
875 .maxlen = sizeof(int),
877 .proc_handler = proc_dointvec_minmax_sysadmin,
882 .procname = "kptr_restrict",
883 .data = &kptr_restrict,
884 .maxlen = sizeof(int),
886 .proc_handler = proc_dointvec_minmax_sysadmin,
892 .procname = "ngroups_max",
893 .data = &ngroups_max,
894 .maxlen = sizeof (int),
896 .proc_handler = proc_dointvec,
899 .procname = "cap_last_cap",
900 .data = (void *)&cap_last_cap,
901 .maxlen = sizeof(int),
903 .proc_handler = proc_dointvec,
905 #if defined(CONFIG_LOCKUP_DETECTOR)
907 .procname = "watchdog",
908 .data = &watchdog_user_enabled,
909 .maxlen = sizeof(int),
911 .proc_handler = proc_watchdog,
916 .procname = "watchdog_thresh",
917 .data = &watchdog_thresh,
918 .maxlen = sizeof(int),
920 .proc_handler = proc_watchdog_thresh,
925 .procname = "nmi_watchdog",
926 .data = &nmi_watchdog_user_enabled,
927 .maxlen = sizeof(int),
928 .mode = NMI_WATCHDOG_SYSCTL_PERM,
929 .proc_handler = proc_nmi_watchdog,
934 .procname = "watchdog_cpumask",
935 .data = &watchdog_cpumask_bits,
938 .proc_handler = proc_watchdog_cpumask,
940 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
942 .procname = "soft_watchdog",
943 .data = &soft_watchdog_user_enabled,
944 .maxlen = sizeof(int),
946 .proc_handler = proc_soft_watchdog,
951 .procname = "softlockup_panic",
952 .data = &softlockup_panic,
953 .maxlen = sizeof(int),
955 .proc_handler = proc_dointvec_minmax,
961 .procname = "softlockup_all_cpu_backtrace",
962 .data = &sysctl_softlockup_all_cpu_backtrace,
963 .maxlen = sizeof(int),
965 .proc_handler = proc_dointvec_minmax,
969 #endif /* CONFIG_SMP */
971 #ifdef CONFIG_HARDLOCKUP_DETECTOR
973 .procname = "hardlockup_panic",
974 .data = &hardlockup_panic,
975 .maxlen = sizeof(int),
977 .proc_handler = proc_dointvec_minmax,
983 .procname = "hardlockup_all_cpu_backtrace",
984 .data = &sysctl_hardlockup_all_cpu_backtrace,
985 .maxlen = sizeof(int),
987 .proc_handler = proc_dointvec_minmax,
991 #endif /* CONFIG_SMP */
995 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
997 .procname = "unknown_nmi_panic",
998 .data = &unknown_nmi_panic,
999 .maxlen = sizeof (int),
1001 .proc_handler = proc_dointvec,
1004 #if defined(CONFIG_X86)
1006 .procname = "panic_on_unrecovered_nmi",
1007 .data = &panic_on_unrecovered_nmi,
1008 .maxlen = sizeof(int),
1010 .proc_handler = proc_dointvec,
1013 .procname = "panic_on_io_nmi",
1014 .data = &panic_on_io_nmi,
1015 .maxlen = sizeof(int),
1017 .proc_handler = proc_dointvec,
1019 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1021 .procname = "panic_on_stackoverflow",
1022 .data = &sysctl_panic_on_stackoverflow,
1023 .maxlen = sizeof(int),
1025 .proc_handler = proc_dointvec,
1029 .procname = "bootloader_type",
1030 .data = &bootloader_type,
1031 .maxlen = sizeof (int),
1033 .proc_handler = proc_dointvec,
1036 .procname = "bootloader_version",
1037 .data = &bootloader_version,
1038 .maxlen = sizeof (int),
1040 .proc_handler = proc_dointvec,
1043 .procname = "io_delay_type",
1044 .data = &io_delay_type,
1045 .maxlen = sizeof(int),
1047 .proc_handler = proc_dointvec,
1050 #if defined(CONFIG_MMU)
1052 .procname = "randomize_va_space",
1053 .data = &randomize_va_space,
1054 .maxlen = sizeof(int),
1056 .proc_handler = proc_dointvec,
1059 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1061 .procname = "spin_retry",
1062 .data = &spin_retry,
1063 .maxlen = sizeof (int),
1065 .proc_handler = proc_dointvec,
1068 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1070 .procname = "acpi_video_flags",
1071 .data = &acpi_realmode_flags,
1072 .maxlen = sizeof (unsigned long),
1074 .proc_handler = proc_doulongvec_minmax,
1077 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1079 .procname = "ignore-unaligned-usertrap",
1080 .data = &no_unaligned_warning,
1081 .maxlen = sizeof (int),
1083 .proc_handler = proc_dointvec,
1088 .procname = "unaligned-dump-stack",
1089 .data = &unaligned_dump_stack,
1090 .maxlen = sizeof (int),
1092 .proc_handler = proc_dointvec,
1095 #ifdef CONFIG_DETECT_HUNG_TASK
1097 .procname = "hung_task_panic",
1098 .data = &sysctl_hung_task_panic,
1099 .maxlen = sizeof(int),
1101 .proc_handler = proc_dointvec_minmax,
1106 .procname = "hung_task_check_count",
1107 .data = &sysctl_hung_task_check_count,
1108 .maxlen = sizeof(int),
1110 .proc_handler = proc_dointvec_minmax,
1114 .procname = "hung_task_timeout_secs",
1115 .data = &sysctl_hung_task_timeout_secs,
1116 .maxlen = sizeof(unsigned long),
1118 .proc_handler = proc_dohung_task_timeout_secs,
1119 .extra2 = &hung_task_timeout_max,
1122 .procname = "hung_task_check_interval_secs",
1123 .data = &sysctl_hung_task_check_interval_secs,
1124 .maxlen = sizeof(unsigned long),
1126 .proc_handler = proc_dohung_task_timeout_secs,
1127 .extra2 = &hung_task_timeout_max,
1130 .procname = "hung_task_warnings",
1131 .data = &sysctl_hung_task_warnings,
1132 .maxlen = sizeof(int),
1134 .proc_handler = proc_dointvec_minmax,
1138 #ifdef CONFIG_RT_MUTEXES
1140 .procname = "max_lock_depth",
1141 .data = &max_lock_depth,
1142 .maxlen = sizeof(int),
1144 .proc_handler = proc_dointvec,
1148 .procname = "poweroff_cmd",
1149 .data = &poweroff_cmd,
1150 .maxlen = POWEROFF_CMD_PATH_LEN,
1152 .proc_handler = proc_dostring,
1158 .child = key_sysctls,
1161 #ifdef CONFIG_PERF_EVENTS
1163 * User-space scripts rely on the existence of this file
1164 * as a feature check for perf_events being enabled.
1166 * So it's an ABI, do not remove!
1169 .procname = "perf_event_paranoid",
1170 .data = &sysctl_perf_event_paranoid,
1171 .maxlen = sizeof(sysctl_perf_event_paranoid),
1173 .proc_handler = proc_dointvec,
1176 .procname = "perf_event_mlock_kb",
1177 .data = &sysctl_perf_event_mlock,
1178 .maxlen = sizeof(sysctl_perf_event_mlock),
1180 .proc_handler = proc_dointvec,
1183 .procname = "perf_event_max_sample_rate",
1184 .data = &sysctl_perf_event_sample_rate,
1185 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1187 .proc_handler = perf_proc_update_handler,
1191 .procname = "perf_cpu_time_max_percent",
1192 .data = &sysctl_perf_cpu_time_max_percent,
1193 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1195 .proc_handler = perf_cpu_time_max_percent_handler,
1197 .extra2 = &one_hundred,
1200 .procname = "perf_event_max_stack",
1201 .data = &sysctl_perf_event_max_stack,
1202 .maxlen = sizeof(sysctl_perf_event_max_stack),
1204 .proc_handler = perf_event_max_stack_handler,
1206 .extra2 = &six_hundred_forty_kb,
1209 .procname = "perf_event_max_contexts_per_stack",
1210 .data = &sysctl_perf_event_max_contexts_per_stack,
1211 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1213 .proc_handler = perf_event_max_stack_handler,
1215 .extra2 = &one_thousand,
1219 .procname = "panic_on_warn",
1220 .data = &panic_on_warn,
1221 .maxlen = sizeof(int),
1223 .proc_handler = proc_dointvec_minmax,
1227 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1229 .procname = "timer_migration",
1230 .data = &sysctl_timer_migration,
1231 .maxlen = sizeof(unsigned int),
1233 .proc_handler = timer_migration_handler,
1238 #ifdef CONFIG_BPF_SYSCALL
1240 .procname = "unprivileged_bpf_disabled",
1241 .data = &sysctl_unprivileged_bpf_disabled,
1242 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1244 /* only handle a transition from default "0" to "1" */
1245 .proc_handler = proc_dointvec_minmax,
1250 .procname = "bpf_stats_enabled",
1251 .data = &bpf_stats_enabled_key.key,
1252 .maxlen = sizeof(bpf_stats_enabled_key),
1254 .proc_handler = proc_do_static_key,
1257 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1259 .procname = "panic_on_rcu_stall",
1260 .data = &sysctl_panic_on_rcu_stall,
1261 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1263 .proc_handler = proc_dointvec_minmax,
1268 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1270 .procname = "stack_erasing",
1272 .maxlen = sizeof(int),
1274 .proc_handler = stack_erasing_sysctl,
1282 static struct ctl_table vm_table[] = {
1284 .procname = "overcommit_memory",
1285 .data = &sysctl_overcommit_memory,
1286 .maxlen = sizeof(sysctl_overcommit_memory),
1288 .proc_handler = proc_dointvec_minmax,
1293 .procname = "panic_on_oom",
1294 .data = &sysctl_panic_on_oom,
1295 .maxlen = sizeof(sysctl_panic_on_oom),
1297 .proc_handler = proc_dointvec_minmax,
1302 .procname = "oom_kill_allocating_task",
1303 .data = &sysctl_oom_kill_allocating_task,
1304 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1306 .proc_handler = proc_dointvec,
1309 .procname = "oom_dump_tasks",
1310 .data = &sysctl_oom_dump_tasks,
1311 .maxlen = sizeof(sysctl_oom_dump_tasks),
1313 .proc_handler = proc_dointvec,
1316 .procname = "overcommit_ratio",
1317 .data = &sysctl_overcommit_ratio,
1318 .maxlen = sizeof(sysctl_overcommit_ratio),
1320 .proc_handler = overcommit_ratio_handler,
1323 .procname = "overcommit_kbytes",
1324 .data = &sysctl_overcommit_kbytes,
1325 .maxlen = sizeof(sysctl_overcommit_kbytes),
1327 .proc_handler = overcommit_kbytes_handler,
1330 .procname = "page-cluster",
1331 .data = &page_cluster,
1332 .maxlen = sizeof(int),
1334 .proc_handler = proc_dointvec_minmax,
1338 .procname = "dirty_background_ratio",
1339 .data = &dirty_background_ratio,
1340 .maxlen = sizeof(dirty_background_ratio),
1342 .proc_handler = dirty_background_ratio_handler,
1344 .extra2 = &one_hundred,
1347 .procname = "dirty_background_bytes",
1348 .data = &dirty_background_bytes,
1349 .maxlen = sizeof(dirty_background_bytes),
1351 .proc_handler = dirty_background_bytes_handler,
1355 .procname = "dirty_ratio",
1356 .data = &vm_dirty_ratio,
1357 .maxlen = sizeof(vm_dirty_ratio),
1359 .proc_handler = dirty_ratio_handler,
1361 .extra2 = &one_hundred,
1364 .procname = "dirty_bytes",
1365 .data = &vm_dirty_bytes,
1366 .maxlen = sizeof(vm_dirty_bytes),
1368 .proc_handler = dirty_bytes_handler,
1369 .extra1 = &dirty_bytes_min,
1372 .procname = "dirty_writeback_centisecs",
1373 .data = &dirty_writeback_interval,
1374 .maxlen = sizeof(dirty_writeback_interval),
1376 .proc_handler = dirty_writeback_centisecs_handler,
1379 .procname = "dirty_expire_centisecs",
1380 .data = &dirty_expire_interval,
1381 .maxlen = sizeof(dirty_expire_interval),
1383 .proc_handler = proc_dointvec_minmax,
1387 .procname = "dirtytime_expire_seconds",
1388 .data = &dirtytime_expire_interval,
1389 .maxlen = sizeof(dirtytime_expire_interval),
1391 .proc_handler = dirtytime_interval_handler,
1395 .procname = "swappiness",
1396 .data = &vm_swappiness,
1397 .maxlen = sizeof(vm_swappiness),
1399 .proc_handler = proc_dointvec_minmax,
1401 .extra2 = &one_hundred,
1403 #ifdef CONFIG_HUGETLB_PAGE
1405 .procname = "nr_hugepages",
1407 .maxlen = sizeof(unsigned long),
1409 .proc_handler = hugetlb_sysctl_handler,
1413 .procname = "nr_hugepages_mempolicy",
1415 .maxlen = sizeof(unsigned long),
1417 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1420 .procname = "numa_stat",
1421 .data = &sysctl_vm_numa_stat,
1422 .maxlen = sizeof(int),
1424 .proc_handler = sysctl_vm_numa_stat_handler,
1430 .procname = "hugetlb_shm_group",
1431 .data = &sysctl_hugetlb_shm_group,
1432 .maxlen = sizeof(gid_t),
1434 .proc_handler = proc_dointvec,
1437 .procname = "nr_overcommit_hugepages",
1439 .maxlen = sizeof(unsigned long),
1441 .proc_handler = hugetlb_overcommit_handler,
1445 .procname = "lowmem_reserve_ratio",
1446 .data = &sysctl_lowmem_reserve_ratio,
1447 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1449 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1452 .procname = "drop_caches",
1453 .data = &sysctl_drop_caches,
1454 .maxlen = sizeof(int),
1456 .proc_handler = drop_caches_sysctl_handler,
1460 #ifdef CONFIG_COMPACTION
1462 .procname = "compact_memory",
1463 .data = &sysctl_compact_memory,
1464 .maxlen = sizeof(int),
1466 .proc_handler = sysctl_compaction_handler,
1469 .procname = "extfrag_threshold",
1470 .data = &sysctl_extfrag_threshold,
1471 .maxlen = sizeof(int),
1473 .proc_handler = proc_dointvec_minmax,
1474 .extra1 = &min_extfrag_threshold,
1475 .extra2 = &max_extfrag_threshold,
1478 .procname = "compact_unevictable_allowed",
1479 .data = &sysctl_compact_unevictable_allowed,
1480 .maxlen = sizeof(int),
1482 .proc_handler = proc_dointvec,
1487 #endif /* CONFIG_COMPACTION */
1489 .procname = "min_free_kbytes",
1490 .data = &min_free_kbytes,
1491 .maxlen = sizeof(min_free_kbytes),
1493 .proc_handler = min_free_kbytes_sysctl_handler,
1497 .procname = "watermark_boost_factor",
1498 .data = &watermark_boost_factor,
1499 .maxlen = sizeof(watermark_boost_factor),
1501 .proc_handler = watermark_boost_factor_sysctl_handler,
1505 .procname = "watermark_scale_factor",
1506 .data = &watermark_scale_factor,
1507 .maxlen = sizeof(watermark_scale_factor),
1509 .proc_handler = watermark_scale_factor_sysctl_handler,
1511 .extra2 = &one_thousand,
1514 .procname = "percpu_pagelist_fraction",
1515 .data = &percpu_pagelist_fraction,
1516 .maxlen = sizeof(percpu_pagelist_fraction),
1518 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1523 .procname = "max_map_count",
1524 .data = &sysctl_max_map_count,
1525 .maxlen = sizeof(sysctl_max_map_count),
1527 .proc_handler = proc_dointvec_minmax,
1532 .procname = "nr_trim_pages",
1533 .data = &sysctl_nr_trim_pages,
1534 .maxlen = sizeof(sysctl_nr_trim_pages),
1536 .proc_handler = proc_dointvec_minmax,
1541 .procname = "laptop_mode",
1542 .data = &laptop_mode,
1543 .maxlen = sizeof(laptop_mode),
1545 .proc_handler = proc_dointvec_jiffies,
1548 .procname = "block_dump",
1549 .data = &block_dump,
1550 .maxlen = sizeof(block_dump),
1552 .proc_handler = proc_dointvec,
1556 .procname = "vfs_cache_pressure",
1557 .data = &sysctl_vfs_cache_pressure,
1558 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1560 .proc_handler = proc_dointvec,
1563 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1565 .procname = "legacy_va_layout",
1566 .data = &sysctl_legacy_va_layout,
1567 .maxlen = sizeof(sysctl_legacy_va_layout),
1569 .proc_handler = proc_dointvec,
1575 .procname = "zone_reclaim_mode",
1576 .data = &node_reclaim_mode,
1577 .maxlen = sizeof(node_reclaim_mode),
1579 .proc_handler = proc_dointvec,
1583 .procname = "min_unmapped_ratio",
1584 .data = &sysctl_min_unmapped_ratio,
1585 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1587 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1589 .extra2 = &one_hundred,
1592 .procname = "min_slab_ratio",
1593 .data = &sysctl_min_slab_ratio,
1594 .maxlen = sizeof(sysctl_min_slab_ratio),
1596 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1598 .extra2 = &one_hundred,
1603 .procname = "stat_interval",
1604 .data = &sysctl_stat_interval,
1605 .maxlen = sizeof(sysctl_stat_interval),
1607 .proc_handler = proc_dointvec_jiffies,
1610 .procname = "stat_refresh",
1614 .proc_handler = vmstat_refresh,
1619 .procname = "mmap_min_addr",
1620 .data = &dac_mmap_min_addr,
1621 .maxlen = sizeof(unsigned long),
1623 .proc_handler = mmap_min_addr_handler,
1628 .procname = "numa_zonelist_order",
1629 .data = &numa_zonelist_order,
1630 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1632 .proc_handler = numa_zonelist_order_handler,
1635 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1636 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1638 .procname = "vdso_enabled",
1639 #ifdef CONFIG_X86_32
1640 .data = &vdso32_enabled,
1641 .maxlen = sizeof(vdso32_enabled),
1643 .data = &vdso_enabled,
1644 .maxlen = sizeof(vdso_enabled),
1647 .proc_handler = proc_dointvec,
1651 #ifdef CONFIG_HIGHMEM
1653 .procname = "highmem_is_dirtyable",
1654 .data = &vm_highmem_is_dirtyable,
1655 .maxlen = sizeof(vm_highmem_is_dirtyable),
1657 .proc_handler = proc_dointvec_minmax,
1662 #ifdef CONFIG_MEMORY_FAILURE
1664 .procname = "memory_failure_early_kill",
1665 .data = &sysctl_memory_failure_early_kill,
1666 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1668 .proc_handler = proc_dointvec_minmax,
1673 .procname = "memory_failure_recovery",
1674 .data = &sysctl_memory_failure_recovery,
1675 .maxlen = sizeof(sysctl_memory_failure_recovery),
1677 .proc_handler = proc_dointvec_minmax,
1683 .procname = "user_reserve_kbytes",
1684 .data = &sysctl_user_reserve_kbytes,
1685 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1687 .proc_handler = proc_doulongvec_minmax,
1690 .procname = "admin_reserve_kbytes",
1691 .data = &sysctl_admin_reserve_kbytes,
1692 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1694 .proc_handler = proc_doulongvec_minmax,
1696 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1698 .procname = "mmap_rnd_bits",
1699 .data = &mmap_rnd_bits,
1700 .maxlen = sizeof(mmap_rnd_bits),
1702 .proc_handler = proc_dointvec_minmax,
1703 .extra1 = (void *)&mmap_rnd_bits_min,
1704 .extra2 = (void *)&mmap_rnd_bits_max,
1707 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1709 .procname = "mmap_rnd_compat_bits",
1710 .data = &mmap_rnd_compat_bits,
1711 .maxlen = sizeof(mmap_rnd_compat_bits),
1713 .proc_handler = proc_dointvec_minmax,
1714 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1715 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1718 #ifdef CONFIG_USERFAULTFD
1720 .procname = "unprivileged_userfaultfd",
1721 .data = &sysctl_unprivileged_userfaultfd,
1722 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
1724 .proc_handler = proc_dointvec_minmax,
1732 static struct ctl_table fs_table[] = {
1734 .procname = "inode-nr",
1735 .data = &inodes_stat,
1736 .maxlen = 2*sizeof(long),
1738 .proc_handler = proc_nr_inodes,
1741 .procname = "inode-state",
1742 .data = &inodes_stat,
1743 .maxlen = 7*sizeof(long),
1745 .proc_handler = proc_nr_inodes,
1748 .procname = "file-nr",
1749 .data = &files_stat,
1750 .maxlen = sizeof(files_stat),
1752 .proc_handler = proc_nr_files,
1755 .procname = "file-max",
1756 .data = &files_stat.max_files,
1757 .maxlen = sizeof(files_stat.max_files),
1759 .proc_handler = proc_doulongvec_minmax,
1761 .extra2 = &long_max,
1764 .procname = "nr_open",
1765 .data = &sysctl_nr_open,
1766 .maxlen = sizeof(unsigned int),
1768 .proc_handler = proc_dointvec_minmax,
1769 .extra1 = &sysctl_nr_open_min,
1770 .extra2 = &sysctl_nr_open_max,
1773 .procname = "dentry-state",
1774 .data = &dentry_stat,
1775 .maxlen = 6*sizeof(long),
1777 .proc_handler = proc_nr_dentry,
1780 .procname = "overflowuid",
1781 .data = &fs_overflowuid,
1782 .maxlen = sizeof(int),
1784 .proc_handler = proc_dointvec_minmax,
1785 .extra1 = &minolduid,
1786 .extra2 = &maxolduid,
1789 .procname = "overflowgid",
1790 .data = &fs_overflowgid,
1791 .maxlen = sizeof(int),
1793 .proc_handler = proc_dointvec_minmax,
1794 .extra1 = &minolduid,
1795 .extra2 = &maxolduid,
1797 #ifdef CONFIG_FILE_LOCKING
1799 .procname = "leases-enable",
1800 .data = &leases_enable,
1801 .maxlen = sizeof(int),
1803 .proc_handler = proc_dointvec,
1806 #ifdef CONFIG_DNOTIFY
1808 .procname = "dir-notify-enable",
1809 .data = &dir_notify_enable,
1810 .maxlen = sizeof(int),
1812 .proc_handler = proc_dointvec,
1816 #ifdef CONFIG_FILE_LOCKING
1818 .procname = "lease-break-time",
1819 .data = &lease_break_time,
1820 .maxlen = sizeof(int),
1822 .proc_handler = proc_dointvec,
1827 .procname = "aio-nr",
1829 .maxlen = sizeof(aio_nr),
1831 .proc_handler = proc_doulongvec_minmax,
1834 .procname = "aio-max-nr",
1835 .data = &aio_max_nr,
1836 .maxlen = sizeof(aio_max_nr),
1838 .proc_handler = proc_doulongvec_minmax,
1840 #endif /* CONFIG_AIO */
1841 #ifdef CONFIG_INOTIFY_USER
1843 .procname = "inotify",
1845 .child = inotify_table,
1850 .procname = "epoll",
1852 .child = epoll_table,
1857 .procname = "protected_symlinks",
1858 .data = &sysctl_protected_symlinks,
1859 .maxlen = sizeof(int),
1861 .proc_handler = proc_dointvec_minmax,
1866 .procname = "protected_hardlinks",
1867 .data = &sysctl_protected_hardlinks,
1868 .maxlen = sizeof(int),
1870 .proc_handler = proc_dointvec_minmax,
1875 .procname = "protected_fifos",
1876 .data = &sysctl_protected_fifos,
1877 .maxlen = sizeof(int),
1879 .proc_handler = proc_dointvec_minmax,
1884 .procname = "protected_regular",
1885 .data = &sysctl_protected_regular,
1886 .maxlen = sizeof(int),
1888 .proc_handler = proc_dointvec_minmax,
1893 .procname = "suid_dumpable",
1894 .data = &suid_dumpable,
1895 .maxlen = sizeof(int),
1897 .proc_handler = proc_dointvec_minmax_coredump,
1901 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1903 .procname = "binfmt_misc",
1905 .child = sysctl_mount_point,
1909 .procname = "pipe-max-size",
1910 .data = &pipe_max_size,
1911 .maxlen = sizeof(pipe_max_size),
1913 .proc_handler = proc_dopipe_max_size,
1916 .procname = "pipe-user-pages-hard",
1917 .data = &pipe_user_pages_hard,
1918 .maxlen = sizeof(pipe_user_pages_hard),
1920 .proc_handler = proc_doulongvec_minmax,
1923 .procname = "pipe-user-pages-soft",
1924 .data = &pipe_user_pages_soft,
1925 .maxlen = sizeof(pipe_user_pages_soft),
1927 .proc_handler = proc_doulongvec_minmax,
1930 .procname = "mount-max",
1931 .data = &sysctl_mount_max,
1932 .maxlen = sizeof(unsigned int),
1934 .proc_handler = proc_dointvec_minmax,
1940 static struct ctl_table debug_table[] = {
1941 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1943 .procname = "exception-trace",
1944 .data = &show_unhandled_signals,
1945 .maxlen = sizeof(int),
1947 .proc_handler = proc_dointvec
1950 #if defined(CONFIG_OPTPROBES)
1952 .procname = "kprobes-optimization",
1953 .data = &sysctl_kprobes_optimization,
1954 .maxlen = sizeof(int),
1956 .proc_handler = proc_kprobes_optimization_handler,
1964 static struct ctl_table dev_table[] = {
1968 int __init sysctl_init(void)
1970 struct ctl_table_header *hdr;
1972 hdr = register_sysctl_table(sysctl_base_table);
1973 kmemleak_not_leak(hdr);
1977 #endif /* CONFIG_SYSCTL */
1983 #ifdef CONFIG_PROC_SYSCTL
1985 static int _proc_do_string(char *data, int maxlen, int write,
1986 char __user *buffer,
1987 size_t *lenp, loff_t *ppos)
1993 if (!data || !maxlen || !*lenp) {
1999 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
2000 /* Only continue writes not past the end of buffer. */
2002 if (len > maxlen - 1)
2009 /* Start writing from beginning of buffer. */
2015 while ((p - buffer) < *lenp && len < maxlen - 1) {
2016 if (get_user(c, p++))
2018 if (c == 0 || c == '\n')
2039 if (copy_to_user(buffer, data, len))
2042 if (put_user('\n', buffer + len))
2052 static void warn_sysctl_write(struct ctl_table *table)
2054 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2055 "This will not be supported in the future. To silence this\n"
2056 "warning, set kernel.sysctl_writes_strict = -1\n",
2057 current->comm, table->procname);
2061 * proc_first_pos_non_zero_ignore - check if first position is allowed
2062 * @ppos: file position
2063 * @table: the sysctl table
2065 * Returns true if the first position is non-zero and the sysctl_writes_strict
2066 * mode indicates this is not allowed for numeric input types. String proc
2067 * handlers can ignore the return value.
2069 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2070 struct ctl_table *table)
2075 switch (sysctl_writes_strict) {
2076 case SYSCTL_WRITES_STRICT:
2078 case SYSCTL_WRITES_WARN:
2079 warn_sysctl_write(table);
2087 * proc_dostring - read a string sysctl
2088 * @table: the sysctl table
2089 * @write: %TRUE if this is a write to the sysctl file
2090 * @buffer: the user buffer
2091 * @lenp: the size of the user buffer
2092 * @ppos: file position
2094 * Reads/writes a string from/to the user buffer. If the kernel
2095 * buffer provided is not large enough to hold the string, the
2096 * string is truncated. The copied string is %NULL-terminated.
2097 * If the string is being read by the user process, it is copied
2098 * and a newline '\n' is added. It is truncated if the buffer is
2101 * Returns 0 on success.
2103 int proc_dostring(struct ctl_table *table, int write,
2104 void __user *buffer, size_t *lenp, loff_t *ppos)
2107 proc_first_pos_non_zero_ignore(ppos, table);
2109 return _proc_do_string((char *)(table->data), table->maxlen, write,
2110 (char __user *)buffer, lenp, ppos);
2113 static size_t proc_skip_spaces(char **buf)
2116 char *tmp = skip_spaces(*buf);
2122 static void proc_skip_char(char **buf, size_t *size, const char v)
2133 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2136 * @cp: kernel buffer containing the string to parse
2137 * @endp: pointer to store the trailing characters
2138 * @base: the base to use
2139 * @res: where the parsed integer will be stored
2141 * In case of success 0 is returned and @res will contain the parsed integer,
2142 * @endp will hold any trailing characters.
2143 * This function will fail the parse on overflow. If there wasn't an overflow
2144 * the function will defer the decision what characters count as invalid to the
2147 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2150 unsigned long long result;
2153 cp = _parse_integer_fixup_radix(cp, &base);
2154 rv = _parse_integer(cp, base, &result);
2155 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2163 *res = (unsigned long)result;
2167 #define TMPBUFLEN 22
2169 * proc_get_long - reads an ASCII formatted integer from a user buffer
2171 * @buf: a kernel buffer
2172 * @size: size of the kernel buffer
2173 * @val: this is where the number will be stored
2174 * @neg: set to %TRUE if number is negative
2175 * @perm_tr: a vector which contains the allowed trailers
2176 * @perm_tr_len: size of the perm_tr vector
2177 * @tr: pointer to store the trailer character
2179 * In case of success %0 is returned and @buf and @size are updated with
2180 * the amount of bytes read. If @tr is non-NULL and a trailing
2181 * character exists (size is non-zero after returning from this
2182 * function), @tr is updated with the trailing character.
2184 static int proc_get_long(char **buf, size_t *size,
2185 unsigned long *val, bool *neg,
2186 const char *perm_tr, unsigned perm_tr_len, char *tr)
2189 char *p, tmp[TMPBUFLEN];
2195 if (len > TMPBUFLEN - 1)
2196 len = TMPBUFLEN - 1;
2198 memcpy(tmp, *buf, len);
2202 if (*p == '-' && *size > 1) {
2210 if (strtoul_lenient(p, &p, 0, val))
2215 /* We don't know if the next char is whitespace thus we may accept
2216 * invalid integers (e.g. 1234...a) or two integers instead of one
2217 * (e.g. 123...1). So lets not allow such large numbers. */
2218 if (len == TMPBUFLEN - 1)
2221 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2224 if (tr && (len < *size))
2234 * proc_put_long - converts an integer to a decimal ASCII formatted string
2236 * @buf: the user buffer
2237 * @size: the size of the user buffer
2238 * @val: the integer to be converted
2239 * @neg: sign of the number, %TRUE for negative
2241 * In case of success %0 is returned and @buf and @size are updated with
2242 * the amount of bytes written.
2244 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2248 char tmp[TMPBUFLEN], *p = tmp;
2250 sprintf(p, "%s%lu", neg ? "-" : "", val);
2254 if (copy_to_user(*buf, tmp, len))
2262 static int proc_put_char(void __user **buf, size_t *size, char c)
2265 char __user **buffer = (char __user **)buf;
2266 if (put_user(c, *buffer))
2268 (*size)--, (*buffer)++;
2274 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2276 int write, void *data)
2280 if (*lvalp > (unsigned long) INT_MAX + 1)
2284 if (*lvalp > (unsigned long) INT_MAX)
2292 *lvalp = -(unsigned long)val;
2295 *lvalp = (unsigned long)val;
2301 static int do_proc_douintvec_conv(unsigned long *lvalp,
2303 int write, void *data)
2306 if (*lvalp > UINT_MAX)
2310 unsigned int val = *valp;
2311 *lvalp = (unsigned long)val;
2316 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2318 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2319 int write, void __user *buffer,
2320 size_t *lenp, loff_t *ppos,
2321 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2322 int write, void *data),
2325 int *i, vleft, first = 1, err = 0;
2327 char *kbuf = NULL, *p;
2329 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2334 i = (int *) tbl_data;
2335 vleft = table->maxlen / sizeof(*i);
2339 conv = do_proc_dointvec_conv;
2342 if (proc_first_pos_non_zero_ignore(ppos, table))
2345 if (left > PAGE_SIZE - 1)
2346 left = PAGE_SIZE - 1;
2347 p = kbuf = memdup_user_nul(buffer, left);
2349 return PTR_ERR(kbuf);
2352 for (; left && vleft--; i++, first=0) {
2357 left -= proc_skip_spaces(&p);
2361 err = proc_get_long(&p, &left, &lval, &neg,
2363 sizeof(proc_wspace_sep), NULL);
2366 if (conv(&neg, &lval, i, 1, data)) {
2371 if (conv(&neg, &lval, i, 0, data)) {
2376 err = proc_put_char(&buffer, &left, '\t');
2379 err = proc_put_long(&buffer, &left, lval, neg);
2385 if (!write && !first && left && !err)
2386 err = proc_put_char(&buffer, &left, '\n');
2387 if (write && !err && left)
2388 left -= proc_skip_spaces(&p);
2392 return err ? : -EINVAL;
2400 static int do_proc_dointvec(struct ctl_table *table, int write,
2401 void __user *buffer, size_t *lenp, loff_t *ppos,
2402 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2403 int write, void *data),
2406 return __do_proc_dointvec(table->data, table, write,
2407 buffer, lenp, ppos, conv, data);
2410 static int do_proc_douintvec_w(unsigned int *tbl_data,
2411 struct ctl_table *table,
2412 void __user *buffer,
2413 size_t *lenp, loff_t *ppos,
2414 int (*conv)(unsigned long *lvalp,
2416 int write, void *data),
2423 char *kbuf = NULL, *p;
2427 if (proc_first_pos_non_zero_ignore(ppos, table))
2430 if (left > PAGE_SIZE - 1)
2431 left = PAGE_SIZE - 1;
2433 p = kbuf = memdup_user_nul(buffer, left);
2437 left -= proc_skip_spaces(&p);
2443 err = proc_get_long(&p, &left, &lval, &neg,
2445 sizeof(proc_wspace_sep), NULL);
2451 if (conv(&lval, tbl_data, 1, data)) {
2457 left -= proc_skip_spaces(&p);
2466 /* This is in keeping with old __do_proc_dointvec() */
2472 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2473 size_t *lenp, loff_t *ppos,
2474 int (*conv)(unsigned long *lvalp,
2476 int write, void *data),
2485 if (conv(&lval, tbl_data, 0, data)) {
2490 err = proc_put_long(&buffer, &left, lval, false);
2494 err = proc_put_char(&buffer, &left, '\n');
2503 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2504 int write, void __user *buffer,
2505 size_t *lenp, loff_t *ppos,
2506 int (*conv)(unsigned long *lvalp,
2508 int write, void *data),
2511 unsigned int *i, vleft;
2513 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2518 i = (unsigned int *) tbl_data;
2519 vleft = table->maxlen / sizeof(*i);
2522 * Arrays are not supported, keep this simple. *Do not* add
2531 conv = do_proc_douintvec_conv;
2534 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2536 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2539 static int do_proc_douintvec(struct ctl_table *table, int write,
2540 void __user *buffer, size_t *lenp, loff_t *ppos,
2541 int (*conv)(unsigned long *lvalp,
2543 int write, void *data),
2546 return __do_proc_douintvec(table->data, table, write,
2547 buffer, lenp, ppos, conv, data);
2551 * proc_dointvec - read a vector of integers
2552 * @table: the sysctl table
2553 * @write: %TRUE if this is a write to the sysctl file
2554 * @buffer: the user buffer
2555 * @lenp: the size of the user buffer
2556 * @ppos: file position
2558 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2559 * values from/to the user buffer, treated as an ASCII string.
2561 * Returns 0 on success.
2563 int proc_dointvec(struct ctl_table *table, int write,
2564 void __user *buffer, size_t *lenp, loff_t *ppos)
2566 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2570 * proc_douintvec - read a vector of unsigned integers
2571 * @table: the sysctl table
2572 * @write: %TRUE if this is a write to the sysctl file
2573 * @buffer: the user buffer
2574 * @lenp: the size of the user buffer
2575 * @ppos: file position
2577 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2578 * values from/to the user buffer, treated as an ASCII string.
2580 * Returns 0 on success.
2582 int proc_douintvec(struct ctl_table *table, int write,
2583 void __user *buffer, size_t *lenp, loff_t *ppos)
2585 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2586 do_proc_douintvec_conv, NULL);
2590 * Taint values can only be increased
2591 * This means we can safely use a temporary.
2593 static int proc_taint(struct ctl_table *table, int write,
2594 void __user *buffer, size_t *lenp, loff_t *ppos)
2597 unsigned long tmptaint = get_taint();
2600 if (write && !capable(CAP_SYS_ADMIN))
2605 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2611 * Poor man's atomic or. Not worth adding a primitive
2612 * to everyone's atomic.h for this
2615 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2616 if ((tmptaint >> i) & 1)
2617 add_taint(i, LOCKDEP_STILL_OK);
2624 #ifdef CONFIG_PRINTK
2625 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2626 void __user *buffer, size_t *lenp, loff_t *ppos)
2628 if (write && !capable(CAP_SYS_ADMIN))
2631 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2636 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2637 * @min: pointer to minimum allowable value
2638 * @max: pointer to maximum allowable value
2640 * The do_proc_dointvec_minmax_conv_param structure provides the
2641 * minimum and maximum values for doing range checking for those sysctl
2642 * parameters that use the proc_dointvec_minmax() handler.
2644 struct do_proc_dointvec_minmax_conv_param {
2649 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2651 int write, void *data)
2654 struct do_proc_dointvec_minmax_conv_param *param = data;
2656 * If writing, first do so via a temporary local int so we can
2657 * bounds-check it before touching *valp.
2659 int *ip = write ? &tmp : valp;
2661 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
2666 if ((param->min && *param->min > tmp) ||
2667 (param->max && *param->max < tmp))
2676 * proc_dointvec_minmax - read a vector of integers with min/max values
2677 * @table: the sysctl table
2678 * @write: %TRUE if this is a write to the sysctl file
2679 * @buffer: the user buffer
2680 * @lenp: the size of the user buffer
2681 * @ppos: file position
2683 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2684 * values from/to the user buffer, treated as an ASCII string.
2686 * This routine will ensure the values are within the range specified by
2687 * table->extra1 (min) and table->extra2 (max).
2689 * Returns 0 on success or -EINVAL on write when the range check fails.
2691 int proc_dointvec_minmax(struct ctl_table *table, int write,
2692 void __user *buffer, size_t *lenp, loff_t *ppos)
2694 struct do_proc_dointvec_minmax_conv_param param = {
2695 .min = (int *) table->extra1,
2696 .max = (int *) table->extra2,
2698 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2699 do_proc_dointvec_minmax_conv, ¶m);
2703 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2704 * @min: pointer to minimum allowable value
2705 * @max: pointer to maximum allowable value
2707 * The do_proc_douintvec_minmax_conv_param structure provides the
2708 * minimum and maximum values for doing range checking for those sysctl
2709 * parameters that use the proc_douintvec_minmax() handler.
2711 struct do_proc_douintvec_minmax_conv_param {
2716 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2718 int write, void *data)
2722 struct do_proc_douintvec_minmax_conv_param *param = data;
2723 /* write via temporary local uint for bounds-checking */
2724 unsigned int *up = write ? &tmp : valp;
2726 ret = do_proc_douintvec_conv(lvalp, up, write, data);
2731 if ((param->min && *param->min > tmp) ||
2732 (param->max && *param->max < tmp))
2742 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2743 * @table: the sysctl table
2744 * @write: %TRUE if this is a write to the sysctl file
2745 * @buffer: the user buffer
2746 * @lenp: the size of the user buffer
2747 * @ppos: file position
2749 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2750 * values from/to the user buffer, treated as an ASCII string. Negative
2751 * strings are not allowed.
2753 * This routine will ensure the values are within the range specified by
2754 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2755 * check for UINT_MAX to avoid having to support wrap around uses from
2758 * Returns 0 on success or -ERANGE on write when the range check fails.
2760 int proc_douintvec_minmax(struct ctl_table *table, int write,
2761 void __user *buffer, size_t *lenp, loff_t *ppos)
2763 struct do_proc_douintvec_minmax_conv_param param = {
2764 .min = (unsigned int *) table->extra1,
2765 .max = (unsigned int *) table->extra2,
2767 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2768 do_proc_douintvec_minmax_conv, ¶m);
2771 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2773 int write, void *data)
2778 val = round_pipe_size(*lvalp);
2784 unsigned int val = *valp;
2785 *lvalp = (unsigned long) val;
2791 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2792 void __user *buffer, size_t *lenp, loff_t *ppos)
2794 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2795 do_proc_dopipe_max_size_conv, NULL);
2798 static void validate_coredump_safety(void)
2800 #ifdef CONFIG_COREDUMP
2801 if (suid_dumpable == SUID_DUMP_ROOT &&
2802 core_pattern[0] != '/' && core_pattern[0] != '|') {
2804 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2805 "Pipe handler or fully qualified core dump path required.\n"
2806 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2812 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2813 void __user *buffer, size_t *lenp, loff_t *ppos)
2815 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2817 validate_coredump_safety();
2821 #ifdef CONFIG_COREDUMP
2822 static int proc_dostring_coredump(struct ctl_table *table, int write,
2823 void __user *buffer, size_t *lenp, loff_t *ppos)
2825 int error = proc_dostring(table, write, buffer, lenp, ppos);
2827 validate_coredump_safety();
2832 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2833 void __user *buffer,
2834 size_t *lenp, loff_t *ppos,
2835 unsigned long convmul,
2836 unsigned long convdiv)
2838 unsigned long *i, *min, *max;
2839 int vleft, first = 1, err = 0;
2841 char *kbuf = NULL, *p;
2843 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2848 i = (unsigned long *) data;
2849 min = (unsigned long *) table->extra1;
2850 max = (unsigned long *) table->extra2;
2851 vleft = table->maxlen / sizeof(unsigned long);
2855 if (proc_first_pos_non_zero_ignore(ppos, table))
2858 if (left > PAGE_SIZE - 1)
2859 left = PAGE_SIZE - 1;
2860 p = kbuf = memdup_user_nul(buffer, left);
2862 return PTR_ERR(kbuf);
2865 for (; left && vleft--; i++, first = 0) {
2871 left -= proc_skip_spaces(&p);
2875 err = proc_get_long(&p, &left, &val, &neg,
2877 sizeof(proc_wspace_sep), NULL);
2882 val = convmul * val / convdiv;
2883 if ((min && val < *min) || (max && val > *max)) {
2889 val = convdiv * (*i) / convmul;
2891 err = proc_put_char(&buffer, &left, '\t');
2895 err = proc_put_long(&buffer, &left, val, false);
2901 if (!write && !first && left && !err)
2902 err = proc_put_char(&buffer, &left, '\n');
2904 left -= proc_skip_spaces(&p);
2908 return err ? : -EINVAL;
2916 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2917 void __user *buffer,
2918 size_t *lenp, loff_t *ppos,
2919 unsigned long convmul,
2920 unsigned long convdiv)
2922 return __do_proc_doulongvec_minmax(table->data, table, write,
2923 buffer, lenp, ppos, convmul, convdiv);
2927 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2928 * @table: the sysctl table
2929 * @write: %TRUE if this is a write to the sysctl file
2930 * @buffer: the user buffer
2931 * @lenp: the size of the user buffer
2932 * @ppos: file position
2934 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2935 * values from/to the user buffer, treated as an ASCII string.
2937 * This routine will ensure the values are within the range specified by
2938 * table->extra1 (min) and table->extra2 (max).
2940 * Returns 0 on success.
2942 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2943 void __user *buffer, size_t *lenp, loff_t *ppos)
2945 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2949 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2950 * @table: the sysctl table
2951 * @write: %TRUE if this is a write to the sysctl file
2952 * @buffer: the user buffer
2953 * @lenp: the size of the user buffer
2954 * @ppos: file position
2956 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2957 * values from/to the user buffer, treated as an ASCII string. The values
2958 * are treated as milliseconds, and converted to jiffies when they are stored.
2960 * This routine will ensure the values are within the range specified by
2961 * table->extra1 (min) and table->extra2 (max).
2963 * Returns 0 on success.
2965 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2966 void __user *buffer,
2967 size_t *lenp, loff_t *ppos)
2969 return do_proc_doulongvec_minmax(table, write, buffer,
2970 lenp, ppos, HZ, 1000l);
2974 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2976 int write, void *data)
2979 if (*lvalp > INT_MAX / HZ)
2981 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2987 lval = -(unsigned long)val;
2990 lval = (unsigned long)val;
2997 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2999 int write, void *data)
3002 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
3004 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
3010 lval = -(unsigned long)val;
3013 lval = (unsigned long)val;
3015 *lvalp = jiffies_to_clock_t(lval);
3020 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
3022 int write, void *data)
3025 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
3035 lval = -(unsigned long)val;
3038 lval = (unsigned long)val;
3040 *lvalp = jiffies_to_msecs(lval);
3046 * proc_dointvec_jiffies - read a vector of integers as seconds
3047 * @table: the sysctl table
3048 * @write: %TRUE if this is a write to the sysctl file
3049 * @buffer: the user buffer
3050 * @lenp: the size of the user buffer
3051 * @ppos: file position
3053 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3054 * values from/to the user buffer, treated as an ASCII string.
3055 * The values read are assumed to be in seconds, and are converted into
3058 * Returns 0 on success.
3060 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3061 void __user *buffer, size_t *lenp, loff_t *ppos)
3063 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3064 do_proc_dointvec_jiffies_conv,NULL);
3068 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3069 * @table: the sysctl table
3070 * @write: %TRUE if this is a write to the sysctl file
3071 * @buffer: the user buffer
3072 * @lenp: the size of the user buffer
3073 * @ppos: pointer to the file position
3075 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3076 * values from/to the user buffer, treated as an ASCII string.
3077 * The values read are assumed to be in 1/USER_HZ seconds, and
3078 * are converted into jiffies.
3080 * Returns 0 on success.
3082 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3083 void __user *buffer, size_t *lenp, loff_t *ppos)
3085 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3086 do_proc_dointvec_userhz_jiffies_conv,NULL);
3090 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3091 * @table: the sysctl table
3092 * @write: %TRUE if this is a write to the sysctl file
3093 * @buffer: the user buffer
3094 * @lenp: the size of the user buffer
3095 * @ppos: file position
3096 * @ppos: the current position in the file
3098 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3099 * values from/to the user buffer, treated as an ASCII string.
3100 * The values read are assumed to be in 1/1000 seconds, and
3101 * are converted into jiffies.
3103 * Returns 0 on success.
3105 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3106 void __user *buffer, size_t *lenp, loff_t *ppos)
3108 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3109 do_proc_dointvec_ms_jiffies_conv, NULL);
3112 static int proc_do_cad_pid(struct ctl_table *table, int write,
3113 void __user *buffer, size_t *lenp, loff_t *ppos)
3115 struct pid *new_pid;
3119 tmp = pid_vnr(cad_pid);
3121 r = __do_proc_dointvec(&tmp, table, write, buffer,
3122 lenp, ppos, NULL, NULL);
3126 new_pid = find_get_pid(tmp);
3130 put_pid(xchg(&cad_pid, new_pid));
3135 * proc_do_large_bitmap - read/write from/to a large bitmap
3136 * @table: the sysctl table
3137 * @write: %TRUE if this is a write to the sysctl file
3138 * @buffer: the user buffer
3139 * @lenp: the size of the user buffer
3140 * @ppos: file position
3142 * The bitmap is stored at table->data and the bitmap length (in bits)
3145 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3146 * large bitmaps may be represented in a compact manner. Writing into
3147 * the file will clear the bitmap then update it with the given input.
3149 * Returns 0 on success.
3151 int proc_do_large_bitmap(struct ctl_table *table, int write,
3152 void __user *buffer, size_t *lenp, loff_t *ppos)
3156 size_t left = *lenp;
3157 unsigned long bitmap_len = table->maxlen;
3158 unsigned long *bitmap = *(unsigned long **) table->data;
3159 unsigned long *tmp_bitmap = NULL;
3160 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3162 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3171 if (left > PAGE_SIZE - 1) {
3172 left = PAGE_SIZE - 1;
3173 /* How much of the buffer we'll skip this pass */
3174 skipped = *lenp - left;
3177 p = kbuf = memdup_user_nul(buffer, left);
3179 return PTR_ERR(kbuf);
3181 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
3186 proc_skip_char(&p, &left, '\n');
3187 while (!err && left) {
3188 unsigned long val_a, val_b;
3192 /* In case we stop parsing mid-number, we can reset */
3194 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3197 * If we consumed the entirety of a truncated buffer or
3198 * only one char is left (may be a "-"), then stop here,
3199 * reset, & come back for more.
3201 if ((left <= 1) && skipped) {
3208 if (val_a >= bitmap_len || neg) {
3220 err = proc_get_long(&p, &left, &val_b,
3221 &neg, tr_b, sizeof(tr_b),
3224 * If we consumed all of a truncated buffer or
3225 * then stop here, reset, & come back for more.
3227 if (!left && skipped) {
3234 if (val_b >= bitmap_len || neg ||
3245 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3247 proc_skip_char(&p, &left, '\n');
3252 unsigned long bit_a, bit_b = 0;
3255 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3256 if (bit_a >= bitmap_len)
3258 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3262 err = proc_put_char(&buffer, &left, ',');
3266 err = proc_put_long(&buffer, &left, bit_a, false);
3269 if (bit_a != bit_b) {
3270 err = proc_put_char(&buffer, &left, '-');
3273 err = proc_put_long(&buffer, &left, bit_b, false);
3281 err = proc_put_char(&buffer, &left, '\n');
3287 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3289 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3295 bitmap_free(tmp_bitmap);
3299 #else /* CONFIG_PROC_SYSCTL */
3301 int proc_dostring(struct ctl_table *table, int write,
3302 void __user *buffer, size_t *lenp, loff_t *ppos)
3307 int proc_dointvec(struct ctl_table *table, int write,
3308 void __user *buffer, size_t *lenp, loff_t *ppos)
3313 int proc_douintvec(struct ctl_table *table, int write,
3314 void __user *buffer, size_t *lenp, loff_t *ppos)
3319 int proc_dointvec_minmax(struct ctl_table *table, int write,
3320 void __user *buffer, size_t *lenp, loff_t *ppos)
3325 int proc_douintvec_minmax(struct ctl_table *table, int write,
3326 void __user *buffer, size_t *lenp, loff_t *ppos)
3331 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3332 void __user *buffer, size_t *lenp, loff_t *ppos)
3337 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3338 void __user *buffer, size_t *lenp, loff_t *ppos)
3343 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3344 void __user *buffer, size_t *lenp, loff_t *ppos)
3349 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3350 void __user *buffer, size_t *lenp, loff_t *ppos)
3355 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3356 void __user *buffer,
3357 size_t *lenp, loff_t *ppos)
3362 int proc_do_large_bitmap(struct ctl_table *table, int write,
3363 void __user *buffer, size_t *lenp, loff_t *ppos)
3368 #endif /* CONFIG_PROC_SYSCTL */
3370 #if defined(CONFIG_SYSCTL)
3371 int proc_do_static_key(struct ctl_table *table, int write,
3372 void __user *buffer, size_t *lenp,
3375 struct static_key *key = (struct static_key *)table->data;
3376 static DEFINE_MUTEX(static_key_mutex);
3378 struct ctl_table tmp = {
3380 .maxlen = sizeof(val),
3381 .mode = table->mode,
3386 if (write && !capable(CAP_SYS_ADMIN))
3389 mutex_lock(&static_key_mutex);
3390 val = static_key_enabled(key);
3391 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3392 if (write && !ret) {
3394 static_key_enable(key);
3396 static_key_disable(key);
3398 mutex_unlock(&static_key_mutex);
3403 * No sense putting this after each symbol definition, twice,
3404 * exception granted :-)
3406 EXPORT_SYMBOL(proc_dointvec);
3407 EXPORT_SYMBOL(proc_douintvec);
3408 EXPORT_SYMBOL(proc_dointvec_jiffies);
3409 EXPORT_SYMBOL(proc_dointvec_minmax);
3410 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3411 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3412 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3413 EXPORT_SYMBOL(proc_dostring);
3414 EXPORT_SYMBOL(proc_doulongvec_minmax);
3415 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3416 EXPORT_SYMBOL(proc_do_large_bitmap);