2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
70 #include <asm/uaccess.h>
71 #include <asm/processor.h>
75 #include <asm/stacktrace.h>
79 #include <asm/setup.h>
81 #ifdef CONFIG_BSD_PROCESS_ACCT
82 #include <linux/acct.h>
84 #ifdef CONFIG_RT_MUTEXES
85 #include <linux/rtmutex.h>
87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88 #include <linux/lockdep.h>
90 #ifdef CONFIG_CHR_DEV_SG
94 #ifdef CONFIG_LOCKUP_DETECTOR
95 #include <linux/nmi.h>
98 #if defined(CONFIG_SYSCTL)
100 /* External variables not in a header file. */
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int compat_log;
111 extern int latencytop_enabled;
112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
114 extern int sysctl_nr_trim_pages;
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
122 static int __maybe_unused neg_one = -1;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 static int one_thousand = 1000;
132 static int ten_thousand = 10000;
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb = 640 * 1024;
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149 #ifdef CONFIG_DETECT_HUNG_TASK
150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
153 #ifdef CONFIG_INOTIFY_USER
154 #include <linux/inotify.h>
160 extern int pwrsw_enabled;
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
168 extern int unaligned_dump_stack;
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
175 #ifdef CONFIG_PROC_SYSCTL
177 #define SYSCTL_WRITES_LEGACY -1
178 #define SYSCTL_WRITES_WARN 0
179 #define SYSCTL_WRITES_STRICT 1
181 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
183 static int proc_do_cad_pid(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
185 static int proc_taint(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
190 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
194 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
195 void __user *buffer, size_t *lenp, loff_t *ppos);
196 #ifdef CONFIG_COREDUMP
197 static int proc_dostring_coredump(struct ctl_table *table, int write,
198 void __user *buffer, size_t *lenp, loff_t *ppos);
201 #ifdef CONFIG_MAGIC_SYSRQ
202 /* Note: sysrq code uses it's own private copy */
203 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
205 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
206 void __user *buffer, size_t *lenp,
211 error = proc_dointvec(table, write, buffer, lenp, ppos);
216 sysrq_toggle_support(__sysrq_enabled);
223 static struct ctl_table kern_table[];
224 static struct ctl_table vm_table[];
225 static struct ctl_table fs_table[];
226 static struct ctl_table debug_table[];
227 static struct ctl_table dev_table[];
228 extern struct ctl_table random_table[];
230 extern struct ctl_table epoll_table[];
233 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
234 int sysctl_legacy_va_layout;
237 /* The default sysctl tables: */
239 static struct ctl_table sysctl_base_table[] = {
241 .procname = "kernel",
258 .child = debug_table,
268 #ifdef CONFIG_SCHED_DEBUG
269 static int min_sched_granularity_ns = 100000; /* 100 usecs */
270 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
271 static int min_wakeup_granularity_ns; /* 0 usecs */
272 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
274 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
275 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
276 #endif /* CONFIG_SMP */
277 #endif /* CONFIG_SCHED_DEBUG */
279 #ifdef CONFIG_COMPACTION
280 static int min_extfrag_threshold;
281 static int max_extfrag_threshold = 1000;
284 static struct ctl_table kern_table[] = {
286 .procname = "sched_child_runs_first",
287 .data = &sysctl_sched_child_runs_first,
288 .maxlen = sizeof(unsigned int),
290 .proc_handler = proc_dointvec,
292 #ifdef CONFIG_SCHED_DEBUG
294 .procname = "sched_min_granularity_ns",
295 .data = &sysctl_sched_min_granularity,
296 .maxlen = sizeof(unsigned int),
298 .proc_handler = sched_proc_update_handler,
299 .extra1 = &min_sched_granularity_ns,
300 .extra2 = &max_sched_granularity_ns,
303 .procname = "sched_latency_ns",
304 .data = &sysctl_sched_latency,
305 .maxlen = sizeof(unsigned int),
307 .proc_handler = sched_proc_update_handler,
308 .extra1 = &min_sched_granularity_ns,
309 .extra2 = &max_sched_granularity_ns,
312 .procname = "sched_wakeup_granularity_ns",
313 .data = &sysctl_sched_wakeup_granularity,
314 .maxlen = sizeof(unsigned int),
316 .proc_handler = sched_proc_update_handler,
317 .extra1 = &min_wakeup_granularity_ns,
318 .extra2 = &max_wakeup_granularity_ns,
322 .procname = "sched_tunable_scaling",
323 .data = &sysctl_sched_tunable_scaling,
324 .maxlen = sizeof(enum sched_tunable_scaling),
326 .proc_handler = sched_proc_update_handler,
327 .extra1 = &min_sched_tunable_scaling,
328 .extra2 = &max_sched_tunable_scaling,
331 .procname = "sched_migration_cost_ns",
332 .data = &sysctl_sched_migration_cost,
333 .maxlen = sizeof(unsigned int),
335 .proc_handler = proc_dointvec,
338 .procname = "sched_nr_migrate",
339 .data = &sysctl_sched_nr_migrate,
340 .maxlen = sizeof(unsigned int),
342 .proc_handler = proc_dointvec,
345 .procname = "sched_time_avg_ms",
346 .data = &sysctl_sched_time_avg,
347 .maxlen = sizeof(unsigned int),
349 .proc_handler = proc_dointvec,
352 .procname = "sched_shares_window_ns",
353 .data = &sysctl_sched_shares_window,
354 .maxlen = sizeof(unsigned int),
356 .proc_handler = proc_dointvec,
358 #ifdef CONFIG_SCHEDSTATS
360 .procname = "sched_schedstats",
362 .maxlen = sizeof(unsigned int),
364 .proc_handler = sysctl_schedstats,
368 #endif /* CONFIG_SCHEDSTATS */
369 #endif /* CONFIG_SMP */
370 #ifdef CONFIG_NUMA_BALANCING
372 .procname = "numa_balancing_scan_delay_ms",
373 .data = &sysctl_numa_balancing_scan_delay,
374 .maxlen = sizeof(unsigned int),
376 .proc_handler = proc_dointvec,
379 .procname = "numa_balancing_scan_period_min_ms",
380 .data = &sysctl_numa_balancing_scan_period_min,
381 .maxlen = sizeof(unsigned int),
383 .proc_handler = proc_dointvec,
386 .procname = "numa_balancing_scan_period_max_ms",
387 .data = &sysctl_numa_balancing_scan_period_max,
388 .maxlen = sizeof(unsigned int),
390 .proc_handler = proc_dointvec,
393 .procname = "numa_balancing_scan_size_mb",
394 .data = &sysctl_numa_balancing_scan_size,
395 .maxlen = sizeof(unsigned int),
397 .proc_handler = proc_dointvec_minmax,
401 .procname = "numa_balancing",
402 .data = NULL, /* filled in by handler */
403 .maxlen = sizeof(unsigned int),
405 .proc_handler = sysctl_numa_balancing,
409 #endif /* CONFIG_NUMA_BALANCING */
410 #endif /* CONFIG_SCHED_DEBUG */
412 .procname = "sched_rt_period_us",
413 .data = &sysctl_sched_rt_period,
414 .maxlen = sizeof(unsigned int),
416 .proc_handler = sched_rt_handler,
419 .procname = "sched_rt_runtime_us",
420 .data = &sysctl_sched_rt_runtime,
421 .maxlen = sizeof(int),
423 .proc_handler = sched_rt_handler,
426 .procname = "sched_rr_timeslice_ms",
427 .data = &sched_rr_timeslice,
428 .maxlen = sizeof(int),
430 .proc_handler = sched_rr_handler,
432 #ifdef CONFIG_SCHED_AUTOGROUP
434 .procname = "sched_autogroup_enabled",
435 .data = &sysctl_sched_autogroup_enabled,
436 .maxlen = sizeof(unsigned int),
438 .proc_handler = proc_dointvec_minmax,
443 #ifdef CONFIG_CFS_BANDWIDTH
445 .procname = "sched_cfs_bandwidth_slice_us",
446 .data = &sysctl_sched_cfs_bandwidth_slice,
447 .maxlen = sizeof(unsigned int),
449 .proc_handler = proc_dointvec_minmax,
453 #ifdef CONFIG_PROVE_LOCKING
455 .procname = "prove_locking",
456 .data = &prove_locking,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec,
462 #ifdef CONFIG_LOCK_STAT
464 .procname = "lock_stat",
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec,
473 .data = &panic_timeout,
474 .maxlen = sizeof(int),
476 .proc_handler = proc_dointvec,
478 #ifdef CONFIG_COREDUMP
480 .procname = "core_uses_pid",
481 .data = &core_uses_pid,
482 .maxlen = sizeof(int),
484 .proc_handler = proc_dointvec,
487 .procname = "core_pattern",
488 .data = core_pattern,
489 .maxlen = CORENAME_MAX_SIZE,
491 .proc_handler = proc_dostring_coredump,
494 .procname = "core_pipe_limit",
495 .data = &core_pipe_limit,
496 .maxlen = sizeof(unsigned int),
498 .proc_handler = proc_dointvec,
501 #ifdef CONFIG_PROC_SYSCTL
503 .procname = "tainted",
504 .maxlen = sizeof(long),
506 .proc_handler = proc_taint,
509 .procname = "sysctl_writes_strict",
510 .data = &sysctl_writes_strict,
511 .maxlen = sizeof(int),
513 .proc_handler = proc_dointvec_minmax,
518 #ifdef CONFIG_LATENCYTOP
520 .procname = "latencytop",
521 .data = &latencytop_enabled,
522 .maxlen = sizeof(int),
524 .proc_handler = sysctl_latencytop,
527 #ifdef CONFIG_BLK_DEV_INITRD
529 .procname = "real-root-dev",
530 .data = &real_root_dev,
531 .maxlen = sizeof(int),
533 .proc_handler = proc_dointvec,
537 .procname = "print-fatal-signals",
538 .data = &print_fatal_signals,
539 .maxlen = sizeof(int),
541 .proc_handler = proc_dointvec,
545 .procname = "reboot-cmd",
546 .data = reboot_command,
549 .proc_handler = proc_dostring,
552 .procname = "stop-a",
553 .data = &stop_a_enabled,
554 .maxlen = sizeof (int),
556 .proc_handler = proc_dointvec,
559 .procname = "scons-poweroff",
560 .data = &scons_pwroff,
561 .maxlen = sizeof (int),
563 .proc_handler = proc_dointvec,
566 #ifdef CONFIG_SPARC64
568 .procname = "tsb-ratio",
569 .data = &sysctl_tsb_ratio,
570 .maxlen = sizeof (int),
572 .proc_handler = proc_dointvec,
577 .procname = "soft-power",
578 .data = &pwrsw_enabled,
579 .maxlen = sizeof (int),
581 .proc_handler = proc_dointvec,
584 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
586 .procname = "unaligned-trap",
587 .data = &unaligned_enabled,
588 .maxlen = sizeof (int),
590 .proc_handler = proc_dointvec,
594 .procname = "ctrl-alt-del",
596 .maxlen = sizeof(int),
598 .proc_handler = proc_dointvec,
600 #ifdef CONFIG_FUNCTION_TRACER
602 .procname = "ftrace_enabled",
603 .data = &ftrace_enabled,
604 .maxlen = sizeof(int),
606 .proc_handler = ftrace_enable_sysctl,
609 #ifdef CONFIG_STACK_TRACER
611 .procname = "stack_tracer_enabled",
612 .data = &stack_tracer_enabled,
613 .maxlen = sizeof(int),
615 .proc_handler = stack_trace_sysctl,
618 #ifdef CONFIG_TRACING
620 .procname = "ftrace_dump_on_oops",
621 .data = &ftrace_dump_on_oops,
622 .maxlen = sizeof(int),
624 .proc_handler = proc_dointvec,
627 .procname = "traceoff_on_warning",
628 .data = &__disable_trace_on_warning,
629 .maxlen = sizeof(__disable_trace_on_warning),
631 .proc_handler = proc_dointvec,
634 .procname = "tracepoint_printk",
635 .data = &tracepoint_printk,
636 .maxlen = sizeof(tracepoint_printk),
638 .proc_handler = proc_dointvec,
641 #ifdef CONFIG_KEXEC_CORE
643 .procname = "kexec_load_disabled",
644 .data = &kexec_load_disabled,
645 .maxlen = sizeof(int),
647 /* only handle a transition from default "0" to "1" */
648 .proc_handler = proc_dointvec_minmax,
653 #ifdef CONFIG_MODULES
655 .procname = "modprobe",
656 .data = &modprobe_path,
657 .maxlen = KMOD_PATH_LEN,
659 .proc_handler = proc_dostring,
662 .procname = "modules_disabled",
663 .data = &modules_disabled,
664 .maxlen = sizeof(int),
666 /* only handle a transition from default "0" to "1" */
667 .proc_handler = proc_dointvec_minmax,
672 #ifdef CONFIG_UEVENT_HELPER
674 .procname = "hotplug",
675 .data = &uevent_helper,
676 .maxlen = UEVENT_HELPER_PATH_LEN,
678 .proc_handler = proc_dostring,
681 #ifdef CONFIG_CHR_DEV_SG
683 .procname = "sg-big-buff",
684 .data = &sg_big_buff,
685 .maxlen = sizeof (int),
687 .proc_handler = proc_dointvec,
690 #ifdef CONFIG_BSD_PROCESS_ACCT
694 .maxlen = 3*sizeof(int),
696 .proc_handler = proc_dointvec,
699 #ifdef CONFIG_MAGIC_SYSRQ
702 .data = &__sysrq_enabled,
703 .maxlen = sizeof (int),
705 .proc_handler = sysrq_sysctl_handler,
708 #ifdef CONFIG_PROC_SYSCTL
710 .procname = "cad_pid",
712 .maxlen = sizeof (int),
714 .proc_handler = proc_do_cad_pid,
718 .procname = "threads-max",
720 .maxlen = sizeof(int),
722 .proc_handler = sysctl_max_threads,
725 .procname = "random",
727 .child = random_table,
730 .procname = "usermodehelper",
732 .child = usermodehelper_table,
735 .procname = "overflowuid",
736 .data = &overflowuid,
737 .maxlen = sizeof(int),
739 .proc_handler = proc_dointvec_minmax,
740 .extra1 = &minolduid,
741 .extra2 = &maxolduid,
744 .procname = "overflowgid",
745 .data = &overflowgid,
746 .maxlen = sizeof(int),
748 .proc_handler = proc_dointvec_minmax,
749 .extra1 = &minolduid,
750 .extra2 = &maxolduid,
753 #ifdef CONFIG_MATHEMU
755 .procname = "ieee_emulation_warnings",
756 .data = &sysctl_ieee_emulation_warnings,
757 .maxlen = sizeof(int),
759 .proc_handler = proc_dointvec,
763 .procname = "userprocess_debug",
764 .data = &show_unhandled_signals,
765 .maxlen = sizeof(int),
767 .proc_handler = proc_dointvec,
771 .procname = "pid_max",
773 .maxlen = sizeof (int),
775 .proc_handler = proc_dointvec_minmax,
776 .extra1 = &pid_max_min,
777 .extra2 = &pid_max_max,
780 .procname = "panic_on_oops",
781 .data = &panic_on_oops,
782 .maxlen = sizeof(int),
784 .proc_handler = proc_dointvec,
786 #if defined CONFIG_PRINTK
788 .procname = "printk",
789 .data = &console_loglevel,
790 .maxlen = 4*sizeof(int),
792 .proc_handler = proc_dointvec,
795 .procname = "printk_ratelimit",
796 .data = &printk_ratelimit_state.interval,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec_jiffies,
802 .procname = "printk_ratelimit_burst",
803 .data = &printk_ratelimit_state.burst,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec,
809 .procname = "printk_delay",
810 .data = &printk_delay_msec,
811 .maxlen = sizeof(int),
813 .proc_handler = proc_dointvec_minmax,
815 .extra2 = &ten_thousand,
818 .procname = "printk_devkmsg",
819 .data = devkmsg_log_str,
820 .maxlen = DEVKMSG_STR_MAX_SIZE,
822 .proc_handler = devkmsg_sysctl_set_loglvl,
825 .procname = "dmesg_restrict",
826 .data = &dmesg_restrict,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dointvec_minmax_sysadmin,
834 .procname = "kptr_restrict",
835 .data = &kptr_restrict,
836 .maxlen = sizeof(int),
838 .proc_handler = proc_dointvec_minmax_sysadmin,
844 .procname = "ngroups_max",
845 .data = &ngroups_max,
846 .maxlen = sizeof (int),
848 .proc_handler = proc_dointvec,
851 .procname = "cap_last_cap",
852 .data = (void *)&cap_last_cap,
853 .maxlen = sizeof(int),
855 .proc_handler = proc_dointvec,
857 #if defined(CONFIG_LOCKUP_DETECTOR)
859 .procname = "watchdog",
860 .data = &watchdog_user_enabled,
861 .maxlen = sizeof (int),
863 .proc_handler = proc_watchdog,
868 .procname = "watchdog_thresh",
869 .data = &watchdog_thresh,
870 .maxlen = sizeof(int),
872 .proc_handler = proc_watchdog_thresh,
877 .procname = "nmi_watchdog",
878 .data = &nmi_watchdog_enabled,
879 .maxlen = sizeof (int),
881 .proc_handler = proc_nmi_watchdog,
883 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
890 .procname = "soft_watchdog",
891 .data = &soft_watchdog_enabled,
892 .maxlen = sizeof (int),
894 .proc_handler = proc_soft_watchdog,
899 .procname = "watchdog_cpumask",
900 .data = &watchdog_cpumask_bits,
903 .proc_handler = proc_watchdog_cpumask,
906 .procname = "softlockup_panic",
907 .data = &softlockup_panic,
908 .maxlen = sizeof(int),
910 .proc_handler = proc_dointvec_minmax,
914 #ifdef CONFIG_HARDLOCKUP_DETECTOR
916 .procname = "hardlockup_panic",
917 .data = &hardlockup_panic,
918 .maxlen = sizeof(int),
920 .proc_handler = proc_dointvec_minmax,
927 .procname = "softlockup_all_cpu_backtrace",
928 .data = &sysctl_softlockup_all_cpu_backtrace,
929 .maxlen = sizeof(int),
931 .proc_handler = proc_dointvec_minmax,
936 .procname = "hardlockup_all_cpu_backtrace",
937 .data = &sysctl_hardlockup_all_cpu_backtrace,
938 .maxlen = sizeof(int),
940 .proc_handler = proc_dointvec_minmax,
944 #endif /* CONFIG_SMP */
946 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
948 .procname = "unknown_nmi_panic",
949 .data = &unknown_nmi_panic,
950 .maxlen = sizeof (int),
952 .proc_handler = proc_dointvec,
955 #if defined(CONFIG_X86)
957 .procname = "panic_on_unrecovered_nmi",
958 .data = &panic_on_unrecovered_nmi,
959 .maxlen = sizeof(int),
961 .proc_handler = proc_dointvec,
964 .procname = "panic_on_io_nmi",
965 .data = &panic_on_io_nmi,
966 .maxlen = sizeof(int),
968 .proc_handler = proc_dointvec,
970 #ifdef CONFIG_DEBUG_STACKOVERFLOW
972 .procname = "panic_on_stackoverflow",
973 .data = &sysctl_panic_on_stackoverflow,
974 .maxlen = sizeof(int),
976 .proc_handler = proc_dointvec,
980 .procname = "bootloader_type",
981 .data = &bootloader_type,
982 .maxlen = sizeof (int),
984 .proc_handler = proc_dointvec,
987 .procname = "bootloader_version",
988 .data = &bootloader_version,
989 .maxlen = sizeof (int),
991 .proc_handler = proc_dointvec,
994 .procname = "kstack_depth_to_print",
995 .data = &kstack_depth_to_print,
996 .maxlen = sizeof(int),
998 .proc_handler = proc_dointvec,
1001 .procname = "io_delay_type",
1002 .data = &io_delay_type,
1003 .maxlen = sizeof(int),
1005 .proc_handler = proc_dointvec,
1008 #if defined(CONFIG_MMU)
1010 .procname = "randomize_va_space",
1011 .data = &randomize_va_space,
1012 .maxlen = sizeof(int),
1014 .proc_handler = proc_dointvec,
1017 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1019 .procname = "spin_retry",
1020 .data = &spin_retry,
1021 .maxlen = sizeof (int),
1023 .proc_handler = proc_dointvec,
1026 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1028 .procname = "acpi_video_flags",
1029 .data = &acpi_realmode_flags,
1030 .maxlen = sizeof (unsigned long),
1032 .proc_handler = proc_doulongvec_minmax,
1035 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1037 .procname = "ignore-unaligned-usertrap",
1038 .data = &no_unaligned_warning,
1039 .maxlen = sizeof (int),
1041 .proc_handler = proc_dointvec,
1046 .procname = "unaligned-dump-stack",
1047 .data = &unaligned_dump_stack,
1048 .maxlen = sizeof (int),
1050 .proc_handler = proc_dointvec,
1053 #ifdef CONFIG_DETECT_HUNG_TASK
1055 .procname = "hung_task_panic",
1056 .data = &sysctl_hung_task_panic,
1057 .maxlen = sizeof(int),
1059 .proc_handler = proc_dointvec_minmax,
1064 .procname = "hung_task_check_count",
1065 .data = &sysctl_hung_task_check_count,
1066 .maxlen = sizeof(int),
1068 .proc_handler = proc_dointvec_minmax,
1072 .procname = "hung_task_timeout_secs",
1073 .data = &sysctl_hung_task_timeout_secs,
1074 .maxlen = sizeof(unsigned long),
1076 .proc_handler = proc_dohung_task_timeout_secs,
1077 .extra2 = &hung_task_timeout_max,
1080 .procname = "hung_task_warnings",
1081 .data = &sysctl_hung_task_warnings,
1082 .maxlen = sizeof(int),
1084 .proc_handler = proc_dointvec_minmax,
1088 #ifdef CONFIG_COMPAT
1090 .procname = "compat-log",
1091 .data = &compat_log,
1092 .maxlen = sizeof (int),
1094 .proc_handler = proc_dointvec,
1097 #ifdef CONFIG_RT_MUTEXES
1099 .procname = "max_lock_depth",
1100 .data = &max_lock_depth,
1101 .maxlen = sizeof(int),
1103 .proc_handler = proc_dointvec,
1107 .procname = "poweroff_cmd",
1108 .data = &poweroff_cmd,
1109 .maxlen = POWEROFF_CMD_PATH_LEN,
1111 .proc_handler = proc_dostring,
1117 .child = key_sysctls,
1120 #ifdef CONFIG_PERF_EVENTS
1122 * User-space scripts rely on the existence of this file
1123 * as a feature check for perf_events being enabled.
1125 * So it's an ABI, do not remove!
1128 .procname = "perf_event_paranoid",
1129 .data = &sysctl_perf_event_paranoid,
1130 .maxlen = sizeof(sysctl_perf_event_paranoid),
1132 .proc_handler = proc_dointvec,
1135 .procname = "perf_event_mlock_kb",
1136 .data = &sysctl_perf_event_mlock,
1137 .maxlen = sizeof(sysctl_perf_event_mlock),
1139 .proc_handler = proc_dointvec,
1142 .procname = "perf_event_max_sample_rate",
1143 .data = &sysctl_perf_event_sample_rate,
1144 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1146 .proc_handler = perf_proc_update_handler,
1150 .procname = "perf_cpu_time_max_percent",
1151 .data = &sysctl_perf_cpu_time_max_percent,
1152 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1154 .proc_handler = perf_cpu_time_max_percent_handler,
1156 .extra2 = &one_hundred,
1159 .procname = "perf_event_max_stack",
1160 .data = &sysctl_perf_event_max_stack,
1161 .maxlen = sizeof(sysctl_perf_event_max_stack),
1163 .proc_handler = perf_event_max_stack_handler,
1165 .extra2 = &six_hundred_forty_kb,
1168 .procname = "perf_event_max_contexts_per_stack",
1169 .data = &sysctl_perf_event_max_contexts_per_stack,
1170 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1172 .proc_handler = perf_event_max_stack_handler,
1174 .extra2 = &one_thousand,
1177 #ifdef CONFIG_KMEMCHECK
1179 .procname = "kmemcheck",
1180 .data = &kmemcheck_enabled,
1181 .maxlen = sizeof(int),
1183 .proc_handler = proc_dointvec,
1187 .procname = "panic_on_warn",
1188 .data = &panic_on_warn,
1189 .maxlen = sizeof(int),
1191 .proc_handler = proc_dointvec_minmax,
1195 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1197 .procname = "timer_migration",
1198 .data = &sysctl_timer_migration,
1199 .maxlen = sizeof(unsigned int),
1201 .proc_handler = timer_migration_handler,
1204 #ifdef CONFIG_BPF_SYSCALL
1206 .procname = "unprivileged_bpf_disabled",
1207 .data = &sysctl_unprivileged_bpf_disabled,
1208 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1210 /* only handle a transition from default "0" to "1" */
1211 .proc_handler = proc_dointvec_minmax,
1216 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1218 .procname = "panic_on_rcu_stall",
1219 .data = &sysctl_panic_on_rcu_stall,
1220 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1222 .proc_handler = proc_dointvec_minmax,
1230 static struct ctl_table vm_table[] = {
1232 .procname = "overcommit_memory",
1233 .data = &sysctl_overcommit_memory,
1234 .maxlen = sizeof(sysctl_overcommit_memory),
1236 .proc_handler = proc_dointvec_minmax,
1241 .procname = "panic_on_oom",
1242 .data = &sysctl_panic_on_oom,
1243 .maxlen = sizeof(sysctl_panic_on_oom),
1245 .proc_handler = proc_dointvec_minmax,
1250 .procname = "oom_kill_allocating_task",
1251 .data = &sysctl_oom_kill_allocating_task,
1252 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1254 .proc_handler = proc_dointvec,
1257 .procname = "oom_dump_tasks",
1258 .data = &sysctl_oom_dump_tasks,
1259 .maxlen = sizeof(sysctl_oom_dump_tasks),
1261 .proc_handler = proc_dointvec,
1264 .procname = "overcommit_ratio",
1265 .data = &sysctl_overcommit_ratio,
1266 .maxlen = sizeof(sysctl_overcommit_ratio),
1268 .proc_handler = overcommit_ratio_handler,
1271 .procname = "overcommit_kbytes",
1272 .data = &sysctl_overcommit_kbytes,
1273 .maxlen = sizeof(sysctl_overcommit_kbytes),
1275 .proc_handler = overcommit_kbytes_handler,
1278 .procname = "page-cluster",
1279 .data = &page_cluster,
1280 .maxlen = sizeof(int),
1282 .proc_handler = proc_dointvec_minmax,
1286 .procname = "dirty_background_ratio",
1287 .data = &dirty_background_ratio,
1288 .maxlen = sizeof(dirty_background_ratio),
1290 .proc_handler = dirty_background_ratio_handler,
1292 .extra2 = &one_hundred,
1295 .procname = "dirty_background_bytes",
1296 .data = &dirty_background_bytes,
1297 .maxlen = sizeof(dirty_background_bytes),
1299 .proc_handler = dirty_background_bytes_handler,
1303 .procname = "dirty_ratio",
1304 .data = &vm_dirty_ratio,
1305 .maxlen = sizeof(vm_dirty_ratio),
1307 .proc_handler = dirty_ratio_handler,
1309 .extra2 = &one_hundred,
1312 .procname = "dirty_bytes",
1313 .data = &vm_dirty_bytes,
1314 .maxlen = sizeof(vm_dirty_bytes),
1316 .proc_handler = dirty_bytes_handler,
1317 .extra1 = &dirty_bytes_min,
1320 .procname = "dirty_writeback_centisecs",
1321 .data = &dirty_writeback_interval,
1322 .maxlen = sizeof(dirty_writeback_interval),
1324 .proc_handler = dirty_writeback_centisecs_handler,
1327 .procname = "dirty_expire_centisecs",
1328 .data = &dirty_expire_interval,
1329 .maxlen = sizeof(dirty_expire_interval),
1331 .proc_handler = proc_dointvec_minmax,
1335 .procname = "dirtytime_expire_seconds",
1336 .data = &dirtytime_expire_interval,
1337 .maxlen = sizeof(dirty_expire_interval),
1339 .proc_handler = dirtytime_interval_handler,
1343 .procname = "nr_pdflush_threads",
1344 .mode = 0444 /* read-only */,
1345 .proc_handler = pdflush_proc_obsolete,
1348 .procname = "swappiness",
1349 .data = &vm_swappiness,
1350 .maxlen = sizeof(vm_swappiness),
1352 .proc_handler = proc_dointvec_minmax,
1354 .extra2 = &one_hundred,
1356 #ifdef CONFIG_HUGETLB_PAGE
1358 .procname = "nr_hugepages",
1360 .maxlen = sizeof(unsigned long),
1362 .proc_handler = hugetlb_sysctl_handler,
1366 .procname = "nr_hugepages_mempolicy",
1368 .maxlen = sizeof(unsigned long),
1370 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1374 .procname = "hugetlb_shm_group",
1375 .data = &sysctl_hugetlb_shm_group,
1376 .maxlen = sizeof(gid_t),
1378 .proc_handler = proc_dointvec,
1381 .procname = "hugepages_treat_as_movable",
1382 .data = &hugepages_treat_as_movable,
1383 .maxlen = sizeof(int),
1385 .proc_handler = proc_dointvec,
1388 .procname = "nr_overcommit_hugepages",
1390 .maxlen = sizeof(unsigned long),
1392 .proc_handler = hugetlb_overcommit_handler,
1396 .procname = "lowmem_reserve_ratio",
1397 .data = &sysctl_lowmem_reserve_ratio,
1398 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1400 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1403 .procname = "drop_caches",
1404 .data = &sysctl_drop_caches,
1405 .maxlen = sizeof(int),
1407 .proc_handler = drop_caches_sysctl_handler,
1411 #ifdef CONFIG_COMPACTION
1413 .procname = "compact_memory",
1414 .data = &sysctl_compact_memory,
1415 .maxlen = sizeof(int),
1417 .proc_handler = sysctl_compaction_handler,
1420 .procname = "extfrag_threshold",
1421 .data = &sysctl_extfrag_threshold,
1422 .maxlen = sizeof(int),
1424 .proc_handler = sysctl_extfrag_handler,
1425 .extra1 = &min_extfrag_threshold,
1426 .extra2 = &max_extfrag_threshold,
1429 .procname = "compact_unevictable_allowed",
1430 .data = &sysctl_compact_unevictable_allowed,
1431 .maxlen = sizeof(int),
1433 .proc_handler = proc_dointvec,
1438 #endif /* CONFIG_COMPACTION */
1440 .procname = "min_free_kbytes",
1441 .data = &min_free_kbytes,
1442 .maxlen = sizeof(min_free_kbytes),
1444 .proc_handler = min_free_kbytes_sysctl_handler,
1448 .procname = "watermark_scale_factor",
1449 .data = &watermark_scale_factor,
1450 .maxlen = sizeof(watermark_scale_factor),
1452 .proc_handler = watermark_scale_factor_sysctl_handler,
1454 .extra2 = &one_thousand,
1457 .procname = "percpu_pagelist_fraction",
1458 .data = &percpu_pagelist_fraction,
1459 .maxlen = sizeof(percpu_pagelist_fraction),
1461 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1466 .procname = "max_map_count",
1467 .data = &sysctl_max_map_count,
1468 .maxlen = sizeof(sysctl_max_map_count),
1470 .proc_handler = proc_dointvec_minmax,
1475 .procname = "nr_trim_pages",
1476 .data = &sysctl_nr_trim_pages,
1477 .maxlen = sizeof(sysctl_nr_trim_pages),
1479 .proc_handler = proc_dointvec_minmax,
1484 .procname = "laptop_mode",
1485 .data = &laptop_mode,
1486 .maxlen = sizeof(laptop_mode),
1488 .proc_handler = proc_dointvec_jiffies,
1491 .procname = "block_dump",
1492 .data = &block_dump,
1493 .maxlen = sizeof(block_dump),
1495 .proc_handler = proc_dointvec,
1499 .procname = "vfs_cache_pressure",
1500 .data = &sysctl_vfs_cache_pressure,
1501 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1503 .proc_handler = proc_dointvec,
1506 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1508 .procname = "legacy_va_layout",
1509 .data = &sysctl_legacy_va_layout,
1510 .maxlen = sizeof(sysctl_legacy_va_layout),
1512 .proc_handler = proc_dointvec,
1518 .procname = "zone_reclaim_mode",
1519 .data = &node_reclaim_mode,
1520 .maxlen = sizeof(node_reclaim_mode),
1522 .proc_handler = proc_dointvec,
1526 .procname = "min_unmapped_ratio",
1527 .data = &sysctl_min_unmapped_ratio,
1528 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1530 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1532 .extra2 = &one_hundred,
1535 .procname = "min_slab_ratio",
1536 .data = &sysctl_min_slab_ratio,
1537 .maxlen = sizeof(sysctl_min_slab_ratio),
1539 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1541 .extra2 = &one_hundred,
1546 .procname = "stat_interval",
1547 .data = &sysctl_stat_interval,
1548 .maxlen = sizeof(sysctl_stat_interval),
1550 .proc_handler = proc_dointvec_jiffies,
1553 .procname = "stat_refresh",
1557 .proc_handler = vmstat_refresh,
1562 .procname = "mmap_min_addr",
1563 .data = &dac_mmap_min_addr,
1564 .maxlen = sizeof(unsigned long),
1566 .proc_handler = mmap_min_addr_handler,
1571 .procname = "numa_zonelist_order",
1572 .data = &numa_zonelist_order,
1573 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1575 .proc_handler = numa_zonelist_order_handler,
1578 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1579 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1581 .procname = "vdso_enabled",
1582 #ifdef CONFIG_X86_32
1583 .data = &vdso32_enabled,
1584 .maxlen = sizeof(vdso32_enabled),
1586 .data = &vdso_enabled,
1587 .maxlen = sizeof(vdso_enabled),
1590 .proc_handler = proc_dointvec,
1594 #ifdef CONFIG_HIGHMEM
1596 .procname = "highmem_is_dirtyable",
1597 .data = &vm_highmem_is_dirtyable,
1598 .maxlen = sizeof(vm_highmem_is_dirtyable),
1600 .proc_handler = proc_dointvec_minmax,
1605 #ifdef CONFIG_MEMORY_FAILURE
1607 .procname = "memory_failure_early_kill",
1608 .data = &sysctl_memory_failure_early_kill,
1609 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1611 .proc_handler = proc_dointvec_minmax,
1616 .procname = "memory_failure_recovery",
1617 .data = &sysctl_memory_failure_recovery,
1618 .maxlen = sizeof(sysctl_memory_failure_recovery),
1620 .proc_handler = proc_dointvec_minmax,
1626 .procname = "user_reserve_kbytes",
1627 .data = &sysctl_user_reserve_kbytes,
1628 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1630 .proc_handler = proc_doulongvec_minmax,
1633 .procname = "admin_reserve_kbytes",
1634 .data = &sysctl_admin_reserve_kbytes,
1635 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1637 .proc_handler = proc_doulongvec_minmax,
1639 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1641 .procname = "mmap_rnd_bits",
1642 .data = &mmap_rnd_bits,
1643 .maxlen = sizeof(mmap_rnd_bits),
1645 .proc_handler = proc_dointvec_minmax,
1646 .extra1 = (void *)&mmap_rnd_bits_min,
1647 .extra2 = (void *)&mmap_rnd_bits_max,
1650 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1652 .procname = "mmap_rnd_compat_bits",
1653 .data = &mmap_rnd_compat_bits,
1654 .maxlen = sizeof(mmap_rnd_compat_bits),
1656 .proc_handler = proc_dointvec_minmax,
1657 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1658 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1664 static struct ctl_table fs_table[] = {
1666 .procname = "inode-nr",
1667 .data = &inodes_stat,
1668 .maxlen = 2*sizeof(long),
1670 .proc_handler = proc_nr_inodes,
1673 .procname = "inode-state",
1674 .data = &inodes_stat,
1675 .maxlen = 7*sizeof(long),
1677 .proc_handler = proc_nr_inodes,
1680 .procname = "file-nr",
1681 .data = &files_stat,
1682 .maxlen = sizeof(files_stat),
1684 .proc_handler = proc_nr_files,
1687 .procname = "file-max",
1688 .data = &files_stat.max_files,
1689 .maxlen = sizeof(files_stat.max_files),
1691 .proc_handler = proc_doulongvec_minmax,
1694 .procname = "nr_open",
1695 .data = &sysctl_nr_open,
1696 .maxlen = sizeof(int),
1698 .proc_handler = proc_dointvec_minmax,
1699 .extra1 = &sysctl_nr_open_min,
1700 .extra2 = &sysctl_nr_open_max,
1703 .procname = "dentry-state",
1704 .data = &dentry_stat,
1705 .maxlen = 6*sizeof(long),
1707 .proc_handler = proc_nr_dentry,
1710 .procname = "overflowuid",
1711 .data = &fs_overflowuid,
1712 .maxlen = sizeof(int),
1714 .proc_handler = proc_dointvec_minmax,
1715 .extra1 = &minolduid,
1716 .extra2 = &maxolduid,
1719 .procname = "overflowgid",
1720 .data = &fs_overflowgid,
1721 .maxlen = sizeof(int),
1723 .proc_handler = proc_dointvec_minmax,
1724 .extra1 = &minolduid,
1725 .extra2 = &maxolduid,
1727 #ifdef CONFIG_FILE_LOCKING
1729 .procname = "leases-enable",
1730 .data = &leases_enable,
1731 .maxlen = sizeof(int),
1733 .proc_handler = proc_dointvec,
1736 #ifdef CONFIG_DNOTIFY
1738 .procname = "dir-notify-enable",
1739 .data = &dir_notify_enable,
1740 .maxlen = sizeof(int),
1742 .proc_handler = proc_dointvec,
1746 #ifdef CONFIG_FILE_LOCKING
1748 .procname = "lease-break-time",
1749 .data = &lease_break_time,
1750 .maxlen = sizeof(int),
1752 .proc_handler = proc_dointvec,
1757 .procname = "aio-nr",
1759 .maxlen = sizeof(aio_nr),
1761 .proc_handler = proc_doulongvec_minmax,
1764 .procname = "aio-max-nr",
1765 .data = &aio_max_nr,
1766 .maxlen = sizeof(aio_max_nr),
1768 .proc_handler = proc_doulongvec_minmax,
1770 #endif /* CONFIG_AIO */
1771 #ifdef CONFIG_INOTIFY_USER
1773 .procname = "inotify",
1775 .child = inotify_table,
1780 .procname = "epoll",
1782 .child = epoll_table,
1787 .procname = "protected_symlinks",
1788 .data = &sysctl_protected_symlinks,
1789 .maxlen = sizeof(int),
1791 .proc_handler = proc_dointvec_minmax,
1796 .procname = "protected_hardlinks",
1797 .data = &sysctl_protected_hardlinks,
1798 .maxlen = sizeof(int),
1800 .proc_handler = proc_dointvec_minmax,
1805 .procname = "suid_dumpable",
1806 .data = &suid_dumpable,
1807 .maxlen = sizeof(int),
1809 .proc_handler = proc_dointvec_minmax_coredump,
1813 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1815 .procname = "binfmt_misc",
1817 .child = sysctl_mount_point,
1821 .procname = "pipe-max-size",
1822 .data = &pipe_max_size,
1823 .maxlen = sizeof(int),
1825 .proc_handler = &pipe_proc_fn,
1826 .extra1 = &pipe_min_size,
1829 .procname = "pipe-user-pages-hard",
1830 .data = &pipe_user_pages_hard,
1831 .maxlen = sizeof(pipe_user_pages_hard),
1833 .proc_handler = proc_doulongvec_minmax,
1836 .procname = "pipe-user-pages-soft",
1837 .data = &pipe_user_pages_soft,
1838 .maxlen = sizeof(pipe_user_pages_soft),
1840 .proc_handler = proc_doulongvec_minmax,
1843 .procname = "mount-max",
1844 .data = &sysctl_mount_max,
1845 .maxlen = sizeof(unsigned int),
1847 .proc_handler = proc_dointvec_minmax,
1853 static struct ctl_table debug_table[] = {
1854 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1856 .procname = "exception-trace",
1857 .data = &show_unhandled_signals,
1858 .maxlen = sizeof(int),
1860 .proc_handler = proc_dointvec
1863 #if defined(CONFIG_OPTPROBES)
1865 .procname = "kprobes-optimization",
1866 .data = &sysctl_kprobes_optimization,
1867 .maxlen = sizeof(int),
1869 .proc_handler = proc_kprobes_optimization_handler,
1877 static struct ctl_table dev_table[] = {
1881 int __init sysctl_init(void)
1883 struct ctl_table_header *hdr;
1885 hdr = register_sysctl_table(sysctl_base_table);
1886 kmemleak_not_leak(hdr);
1890 #endif /* CONFIG_SYSCTL */
1896 #ifdef CONFIG_PROC_SYSCTL
1898 static int _proc_do_string(char *data, int maxlen, int write,
1899 char __user *buffer,
1900 size_t *lenp, loff_t *ppos)
1906 if (!data || !maxlen || !*lenp) {
1912 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1913 /* Only continue writes not past the end of buffer. */
1915 if (len > maxlen - 1)
1922 /* Start writing from beginning of buffer. */
1928 while ((p - buffer) < *lenp && len < maxlen - 1) {
1929 if (get_user(c, p++))
1931 if (c == 0 || c == '\n')
1952 if (copy_to_user(buffer, data, len))
1955 if (put_user('\n', buffer + len))
1965 static void warn_sysctl_write(struct ctl_table *table)
1967 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1968 "This will not be supported in the future. To silence this\n"
1969 "warning, set kernel.sysctl_writes_strict = -1\n",
1970 current->comm, table->procname);
1974 * proc_dostring - read a string sysctl
1975 * @table: the sysctl table
1976 * @write: %TRUE if this is a write to the sysctl file
1977 * @buffer: the user buffer
1978 * @lenp: the size of the user buffer
1979 * @ppos: file position
1981 * Reads/writes a string from/to the user buffer. If the kernel
1982 * buffer provided is not large enough to hold the string, the
1983 * string is truncated. The copied string is %NULL-terminated.
1984 * If the string is being read by the user process, it is copied
1985 * and a newline '\n' is added. It is truncated if the buffer is
1988 * Returns 0 on success.
1990 int proc_dostring(struct ctl_table *table, int write,
1991 void __user *buffer, size_t *lenp, loff_t *ppos)
1993 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1994 warn_sysctl_write(table);
1996 return _proc_do_string((char *)(table->data), table->maxlen, write,
1997 (char __user *)buffer, lenp, ppos);
2000 static size_t proc_skip_spaces(char **buf)
2003 char *tmp = skip_spaces(*buf);
2009 static void proc_skip_char(char **buf, size_t *size, const char v)
2019 #define TMPBUFLEN 22
2021 * proc_get_long - reads an ASCII formatted integer from a user buffer
2023 * @buf: a kernel buffer
2024 * @size: size of the kernel buffer
2025 * @val: this is where the number will be stored
2026 * @neg: set to %TRUE if number is negative
2027 * @perm_tr: a vector which contains the allowed trailers
2028 * @perm_tr_len: size of the perm_tr vector
2029 * @tr: pointer to store the trailer character
2031 * In case of success %0 is returned and @buf and @size are updated with
2032 * the amount of bytes read. If @tr is non-NULL and a trailing
2033 * character exists (size is non-zero after returning from this
2034 * function), @tr is updated with the trailing character.
2036 static int proc_get_long(char **buf, size_t *size,
2037 unsigned long *val, bool *neg,
2038 const char *perm_tr, unsigned perm_tr_len, char *tr)
2041 char *p, tmp[TMPBUFLEN];
2047 if (len > TMPBUFLEN - 1)
2048 len = TMPBUFLEN - 1;
2050 memcpy(tmp, *buf, len);
2054 if (*p == '-' && *size > 1) {
2062 *val = simple_strtoul(p, &p, 0);
2066 /* We don't know if the next char is whitespace thus we may accept
2067 * invalid integers (e.g. 1234...a) or two integers instead of one
2068 * (e.g. 123...1). So lets not allow such large numbers. */
2069 if (len == TMPBUFLEN - 1)
2072 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2075 if (tr && (len < *size))
2085 * proc_put_long - converts an integer to a decimal ASCII formatted string
2087 * @buf: the user buffer
2088 * @size: the size of the user buffer
2089 * @val: the integer to be converted
2090 * @neg: sign of the number, %TRUE for negative
2092 * In case of success %0 is returned and @buf and @size are updated with
2093 * the amount of bytes written.
2095 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2099 char tmp[TMPBUFLEN], *p = tmp;
2101 sprintf(p, "%s%lu", neg ? "-" : "", val);
2105 if (copy_to_user(*buf, tmp, len))
2113 static int proc_put_char(void __user **buf, size_t *size, char c)
2116 char __user **buffer = (char __user **)buf;
2117 if (put_user(c, *buffer))
2119 (*size)--, (*buffer)++;
2125 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2127 int write, void *data)
2131 if (*lvalp > (unsigned long) INT_MAX + 1)
2135 if (*lvalp > (unsigned long) INT_MAX)
2143 *lvalp = -(unsigned long)val;
2146 *lvalp = (unsigned long)val;
2152 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2154 int write, void *data)
2161 unsigned int val = *valp;
2162 *lvalp = (unsigned long)val;
2167 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2169 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2170 int write, void __user *buffer,
2171 size_t *lenp, loff_t *ppos,
2172 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2173 int write, void *data),
2176 int *i, vleft, first = 1, err = 0;
2178 char *kbuf = NULL, *p;
2180 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2185 i = (int *) tbl_data;
2186 vleft = table->maxlen / sizeof(*i);
2190 conv = do_proc_dointvec_conv;
2194 switch (sysctl_writes_strict) {
2195 case SYSCTL_WRITES_STRICT:
2197 case SYSCTL_WRITES_WARN:
2198 warn_sysctl_write(table);
2205 if (left > PAGE_SIZE - 1)
2206 left = PAGE_SIZE - 1;
2207 p = kbuf = memdup_user_nul(buffer, left);
2209 return PTR_ERR(kbuf);
2212 for (; left && vleft--; i++, first=0) {
2217 left -= proc_skip_spaces(&p);
2221 err = proc_get_long(&p, &left, &lval, &neg,
2223 sizeof(proc_wspace_sep), NULL);
2226 if (conv(&neg, &lval, i, 1, data)) {
2231 if (conv(&neg, &lval, i, 0, data)) {
2236 err = proc_put_char(&buffer, &left, '\t');
2239 err = proc_put_long(&buffer, &left, lval, neg);
2245 if (!write && !first && left && !err)
2246 err = proc_put_char(&buffer, &left, '\n');
2247 if (write && !err && left)
2248 left -= proc_skip_spaces(&p);
2252 return err ? : -EINVAL;
2260 static int do_proc_dointvec(struct ctl_table *table, int write,
2261 void __user *buffer, size_t *lenp, loff_t *ppos,
2262 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2263 int write, void *data),
2266 return __do_proc_dointvec(table->data, table, write,
2267 buffer, lenp, ppos, conv, data);
2271 * proc_dointvec - read a vector of integers
2272 * @table: the sysctl table
2273 * @write: %TRUE if this is a write to the sysctl file
2274 * @buffer: the user buffer
2275 * @lenp: the size of the user buffer
2276 * @ppos: file position
2278 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2279 * values from/to the user buffer, treated as an ASCII string.
2281 * Returns 0 on success.
2283 int proc_dointvec(struct ctl_table *table, int write,
2284 void __user *buffer, size_t *lenp, loff_t *ppos)
2286 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2290 * proc_douintvec - read a vector of unsigned integers
2291 * @table: the sysctl table
2292 * @write: %TRUE if this is a write to the sysctl file
2293 * @buffer: the user buffer
2294 * @lenp: the size of the user buffer
2295 * @ppos: file position
2297 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2298 * values from/to the user buffer, treated as an ASCII string.
2300 * Returns 0 on success.
2302 int proc_douintvec(struct ctl_table *table, int write,
2303 void __user *buffer, size_t *lenp, loff_t *ppos)
2305 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2306 do_proc_douintvec_conv, NULL);
2310 * Taint values can only be increased
2311 * This means we can safely use a temporary.
2313 static int proc_taint(struct ctl_table *table, int write,
2314 void __user *buffer, size_t *lenp, loff_t *ppos)
2317 unsigned long tmptaint = get_taint();
2320 if (write && !capable(CAP_SYS_ADMIN))
2325 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2331 * Poor man's atomic or. Not worth adding a primitive
2332 * to everyone's atomic.h for this
2335 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2336 if ((tmptaint >> i) & 1)
2337 add_taint(i, LOCKDEP_STILL_OK);
2344 #ifdef CONFIG_PRINTK
2345 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2346 void __user *buffer, size_t *lenp, loff_t *ppos)
2348 if (write && !capable(CAP_SYS_ADMIN))
2351 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2355 struct do_proc_dointvec_minmax_conv_param {
2360 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2362 int write, void *data)
2364 struct do_proc_dointvec_minmax_conv_param *param = data;
2366 int val = *negp ? -*lvalp : *lvalp;
2367 if ((param->min && *param->min > val) ||
2368 (param->max && *param->max < val))
2375 *lvalp = -(unsigned long)val;
2378 *lvalp = (unsigned long)val;
2385 * proc_dointvec_minmax - read a vector of integers with min/max values
2386 * @table: the sysctl table
2387 * @write: %TRUE if this is a write to the sysctl file
2388 * @buffer: the user buffer
2389 * @lenp: the size of the user buffer
2390 * @ppos: file position
2392 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2393 * values from/to the user buffer, treated as an ASCII string.
2395 * This routine will ensure the values are within the range specified by
2396 * table->extra1 (min) and table->extra2 (max).
2398 * Returns 0 on success.
2400 int proc_dointvec_minmax(struct ctl_table *table, int write,
2401 void __user *buffer, size_t *lenp, loff_t *ppos)
2403 struct do_proc_dointvec_minmax_conv_param param = {
2404 .min = (int *) table->extra1,
2405 .max = (int *) table->extra2,
2407 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2408 do_proc_dointvec_minmax_conv, ¶m);
2411 static void validate_coredump_safety(void)
2413 #ifdef CONFIG_COREDUMP
2414 if (suid_dumpable == SUID_DUMP_ROOT &&
2415 core_pattern[0] != '/' && core_pattern[0] != '|') {
2416 printk(KERN_WARNING "Unsafe core_pattern used with "\
2417 "suid_dumpable=2. Pipe handler or fully qualified "\
2418 "core dump path required.\n");
2423 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2424 void __user *buffer, size_t *lenp, loff_t *ppos)
2426 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2428 validate_coredump_safety();
2432 #ifdef CONFIG_COREDUMP
2433 static int proc_dostring_coredump(struct ctl_table *table, int write,
2434 void __user *buffer, size_t *lenp, loff_t *ppos)
2436 int error = proc_dostring(table, write, buffer, lenp, ppos);
2438 validate_coredump_safety();
2443 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2444 void __user *buffer,
2445 size_t *lenp, loff_t *ppos,
2446 unsigned long convmul,
2447 unsigned long convdiv)
2449 unsigned long *i, *min, *max;
2450 int vleft, first = 1, err = 0;
2452 char *kbuf = NULL, *p;
2454 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2459 i = (unsigned long *) data;
2460 min = (unsigned long *) table->extra1;
2461 max = (unsigned long *) table->extra2;
2462 vleft = table->maxlen / sizeof(unsigned long);
2467 switch (sysctl_writes_strict) {
2468 case SYSCTL_WRITES_STRICT:
2470 case SYSCTL_WRITES_WARN:
2471 warn_sysctl_write(table);
2478 if (left > PAGE_SIZE - 1)
2479 left = PAGE_SIZE - 1;
2480 p = kbuf = memdup_user_nul(buffer, left);
2482 return PTR_ERR(kbuf);
2485 for (; left && vleft--; i++, first = 0) {
2491 left -= proc_skip_spaces(&p);
2493 err = proc_get_long(&p, &left, &val, &neg,
2495 sizeof(proc_wspace_sep), NULL);
2500 if ((min && val < *min) || (max && val > *max))
2504 val = convdiv * (*i) / convmul;
2506 err = proc_put_char(&buffer, &left, '\t');
2510 err = proc_put_long(&buffer, &left, val, false);
2516 if (!write && !first && left && !err)
2517 err = proc_put_char(&buffer, &left, '\n');
2519 left -= proc_skip_spaces(&p);
2523 return err ? : -EINVAL;
2531 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2532 void __user *buffer,
2533 size_t *lenp, loff_t *ppos,
2534 unsigned long convmul,
2535 unsigned long convdiv)
2537 return __do_proc_doulongvec_minmax(table->data, table, write,
2538 buffer, lenp, ppos, convmul, convdiv);
2542 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2543 * @table: the sysctl table
2544 * @write: %TRUE if this is a write to the sysctl file
2545 * @buffer: the user buffer
2546 * @lenp: the size of the user buffer
2547 * @ppos: file position
2549 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2550 * values from/to the user buffer, treated as an ASCII string.
2552 * This routine will ensure the values are within the range specified by
2553 * table->extra1 (min) and table->extra2 (max).
2555 * Returns 0 on success.
2557 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2560 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2564 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
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 long) unsigned long
2572 * values from/to the user buffer, treated as an ASCII string. The values
2573 * are treated as milliseconds, and converted to jiffies when they are stored.
2575 * This routine will ensure the values are within the range specified by
2576 * table->extra1 (min) and table->extra2 (max).
2578 * Returns 0 on success.
2580 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2581 void __user *buffer,
2582 size_t *lenp, loff_t *ppos)
2584 return do_proc_doulongvec_minmax(table, write, buffer,
2585 lenp, ppos, HZ, 1000l);
2589 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2591 int write, void *data)
2594 if (*lvalp > LONG_MAX / HZ)
2596 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2602 lval = -(unsigned long)val;
2605 lval = (unsigned long)val;
2612 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2614 int write, void *data)
2617 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2619 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2625 lval = -(unsigned long)val;
2628 lval = (unsigned long)val;
2630 *lvalp = jiffies_to_clock_t(lval);
2635 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2637 int write, void *data)
2640 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2650 lval = -(unsigned long)val;
2653 lval = (unsigned long)val;
2655 *lvalp = jiffies_to_msecs(lval);
2661 * proc_dointvec_jiffies - read a vector of integers as seconds
2662 * @table: the sysctl table
2663 * @write: %TRUE if this is a write to the sysctl file
2664 * @buffer: the user buffer
2665 * @lenp: the size of the user buffer
2666 * @ppos: file position
2668 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2669 * values from/to the user buffer, treated as an ASCII string.
2670 * The values read are assumed to be in seconds, and are converted into
2673 * Returns 0 on success.
2675 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2676 void __user *buffer, size_t *lenp, loff_t *ppos)
2678 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2679 do_proc_dointvec_jiffies_conv,NULL);
2683 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2684 * @table: the sysctl table
2685 * @write: %TRUE if this is a write to the sysctl file
2686 * @buffer: the user buffer
2687 * @lenp: the size of the user buffer
2688 * @ppos: pointer to the file position
2690 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2691 * values from/to the user buffer, treated as an ASCII string.
2692 * The values read are assumed to be in 1/USER_HZ seconds, and
2693 * are converted into jiffies.
2695 * Returns 0 on success.
2697 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2698 void __user *buffer, size_t *lenp, loff_t *ppos)
2700 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2701 do_proc_dointvec_userhz_jiffies_conv,NULL);
2705 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2706 * @table: the sysctl table
2707 * @write: %TRUE if this is a write to the sysctl file
2708 * @buffer: the user buffer
2709 * @lenp: the size of the user buffer
2710 * @ppos: file position
2711 * @ppos: the current position in the file
2713 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2714 * values from/to the user buffer, treated as an ASCII string.
2715 * The values read are assumed to be in 1/1000 seconds, and
2716 * are converted into jiffies.
2718 * Returns 0 on success.
2720 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2721 void __user *buffer, size_t *lenp, loff_t *ppos)
2723 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2724 do_proc_dointvec_ms_jiffies_conv, NULL);
2727 static int proc_do_cad_pid(struct ctl_table *table, int write,
2728 void __user *buffer, size_t *lenp, loff_t *ppos)
2730 struct pid *new_pid;
2734 tmp = pid_vnr(cad_pid);
2736 r = __do_proc_dointvec(&tmp, table, write, buffer,
2737 lenp, ppos, NULL, NULL);
2741 new_pid = find_get_pid(tmp);
2745 put_pid(xchg(&cad_pid, new_pid));
2750 * proc_do_large_bitmap - read/write from/to a large bitmap
2751 * @table: the sysctl table
2752 * @write: %TRUE if this is a write to the sysctl file
2753 * @buffer: the user buffer
2754 * @lenp: the size of the user buffer
2755 * @ppos: file position
2757 * The bitmap is stored at table->data and the bitmap length (in bits)
2760 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2761 * large bitmaps may be represented in a compact manner. Writing into
2762 * the file will clear the bitmap then update it with the given input.
2764 * Returns 0 on success.
2766 int proc_do_large_bitmap(struct ctl_table *table, int write,
2767 void __user *buffer, size_t *lenp, loff_t *ppos)
2771 size_t left = *lenp;
2772 unsigned long bitmap_len = table->maxlen;
2773 unsigned long *bitmap = *(unsigned long **) table->data;
2774 unsigned long *tmp_bitmap = NULL;
2775 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2777 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2785 if (left > PAGE_SIZE - 1)
2786 left = PAGE_SIZE - 1;
2788 p = kbuf = memdup_user_nul(buffer, left);
2790 return PTR_ERR(kbuf);
2792 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2798 proc_skip_char(&p, &left, '\n');
2799 while (!err && left) {
2800 unsigned long val_a, val_b;
2803 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2807 if (val_a >= bitmap_len || neg) {
2819 err = proc_get_long(&p, &left, &val_b,
2820 &neg, tr_b, sizeof(tr_b),
2824 if (val_b >= bitmap_len || neg ||
2835 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2837 proc_skip_char(&p, &left, '\n');
2841 unsigned long bit_a, bit_b = 0;
2844 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2845 if (bit_a >= bitmap_len)
2847 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2851 err = proc_put_char(&buffer, &left, ',');
2855 err = proc_put_long(&buffer, &left, bit_a, false);
2858 if (bit_a != bit_b) {
2859 err = proc_put_char(&buffer, &left, '-');
2862 err = proc_put_long(&buffer, &left, bit_b, false);
2870 err = proc_put_char(&buffer, &left, '\n');
2876 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2878 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2890 #else /* CONFIG_PROC_SYSCTL */
2892 int proc_dostring(struct ctl_table *table, int write,
2893 void __user *buffer, size_t *lenp, loff_t *ppos)
2898 int proc_dointvec(struct ctl_table *table, int write,
2899 void __user *buffer, size_t *lenp, loff_t *ppos)
2904 int proc_douintvec(struct ctl_table *table, int write,
2905 void __user *buffer, size_t *lenp, loff_t *ppos)
2910 int proc_dointvec_minmax(struct ctl_table *table, int write,
2911 void __user *buffer, size_t *lenp, loff_t *ppos)
2916 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2917 void __user *buffer, size_t *lenp, loff_t *ppos)
2922 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2923 void __user *buffer, size_t *lenp, loff_t *ppos)
2928 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2934 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2935 void __user *buffer, size_t *lenp, loff_t *ppos)
2940 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2941 void __user *buffer,
2942 size_t *lenp, loff_t *ppos)
2948 #endif /* CONFIG_PROC_SYSCTL */
2951 * No sense putting this after each symbol definition, twice,
2952 * exception granted :-)
2954 EXPORT_SYMBOL(proc_dointvec);
2955 EXPORT_SYMBOL(proc_douintvec);
2956 EXPORT_SYMBOL(proc_dointvec_jiffies);
2957 EXPORT_SYMBOL(proc_dointvec_minmax);
2958 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2959 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2960 EXPORT_SYMBOL(proc_dostring);
2961 EXPORT_SYMBOL(proc_doulongvec_minmax);
2962 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);