2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/sched/coredump.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
70 #include <linux/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 latencytop_enabled;
111 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 extern int sysctl_nr_trim_pages;
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
121 static int __maybe_unused neg_one = -1;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long zero_ul;
128 static unsigned long one_ul = 1;
129 static unsigned long long_max = LONG_MAX;
130 static int one_hundred = 100;
131 static int one_thousand = 1000;
133 static int ten_thousand = 10000;
135 #ifdef CONFIG_PERF_EVENTS
136 static int six_hundred_forty_kb = 640 * 1024;
139 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
140 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
142 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
143 static int maxolduid = 65535;
144 static int minolduid;
146 static int ngroups_max = NGROUPS_MAX;
147 static const int cap_last_cap = CAP_LAST_CAP;
149 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
150 #ifdef CONFIG_DETECT_HUNG_TASK
151 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
154 #ifdef CONFIG_INOTIFY_USER
155 #include <linux/inotify.h>
161 extern int pwrsw_enabled;
164 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
165 extern int unaligned_enabled;
169 extern int unaligned_dump_stack;
172 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
173 extern int no_unaligned_warning;
176 #ifdef CONFIG_PROC_SYSCTL
179 * enum sysctl_writes_mode - supported sysctl write modes
181 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
182 * to be written, and multiple writes on the same sysctl file descriptor
183 * will rewrite the sysctl value, regardless of file position. No warning
184 * is issued when the initial position is not 0.
185 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
187 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
188 * file position 0 and the value must be fully contained in the buffer
189 * sent to the write syscall. If dealing with strings respect the file
190 * position, but restrict this to the max length of the buffer, anything
191 * passed the max lenght will be ignored. Multiple writes will append
194 * These write modes control how current file position affects the behavior of
195 * updating sysctl values through the proc interface on each write.
197 enum sysctl_writes_mode {
198 SYSCTL_WRITES_LEGACY = -1,
199 SYSCTL_WRITES_WARN = 0,
200 SYSCTL_WRITES_STRICT = 1,
203 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
205 static int proc_do_cad_pid(struct ctl_table *table, int write,
206 void __user *buffer, size_t *lenp, loff_t *ppos);
207 static int proc_taint(struct ctl_table *table, int write,
208 void __user *buffer, size_t *lenp, loff_t *ppos);
212 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
213 void __user *buffer, size_t *lenp, loff_t *ppos);
216 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
217 void __user *buffer, size_t *lenp, loff_t *ppos);
218 #ifdef CONFIG_COREDUMP
219 static int proc_dostring_coredump(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos);
223 #ifdef CONFIG_MAGIC_SYSRQ
224 /* Note: sysrq code uses it's own private copy */
225 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
227 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
228 void __user *buffer, size_t *lenp,
233 error = proc_dointvec(table, write, buffer, lenp, ppos);
238 sysrq_toggle_support(__sysrq_enabled);
245 #ifdef CONFIG_BPF_SYSCALL
247 void __weak unpriv_ebpf_notify(int new_state)
251 static int bpf_unpriv_handler(struct ctl_table *table, int write,
252 void *buffer, size_t *lenp, loff_t *ppos)
254 int ret, unpriv_enable = *(int *)table->data;
255 bool locked_state = unpriv_enable == 1;
256 struct ctl_table tmp = *table;
258 if (write && !capable(CAP_SYS_ADMIN))
261 tmp.data = &unpriv_enable;
262 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
264 if (locked_state && unpriv_enable != 1)
266 *(int *)table->data = unpriv_enable;
269 unpriv_ebpf_notify(unpriv_enable);
275 static struct ctl_table kern_table[];
276 static struct ctl_table vm_table[];
277 static struct ctl_table fs_table[];
278 static struct ctl_table debug_table[];
279 static struct ctl_table dev_table[];
280 extern struct ctl_table random_table[];
282 extern struct ctl_table epoll_table[];
285 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
286 int sysctl_legacy_va_layout;
289 /* The default sysctl tables: */
291 static struct ctl_table sysctl_base_table[] = {
293 .procname = "kernel",
310 .child = debug_table,
320 #ifdef CONFIG_SCHED_DEBUG
321 static int min_sched_granularity_ns = 100000; /* 100 usecs */
322 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
323 static int min_wakeup_granularity_ns; /* 0 usecs */
324 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
326 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
327 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
328 #endif /* CONFIG_SMP */
329 #endif /* CONFIG_SCHED_DEBUG */
331 #ifdef CONFIG_COMPACTION
332 static int min_extfrag_threshold;
333 static int max_extfrag_threshold = 1000;
336 static struct ctl_table kern_table[] = {
338 .procname = "sched_child_runs_first",
339 .data = &sysctl_sched_child_runs_first,
340 .maxlen = sizeof(unsigned int),
342 .proc_handler = proc_dointvec,
344 #ifdef CONFIG_SCHED_DEBUG
346 .procname = "sched_min_granularity_ns",
347 .data = &sysctl_sched_min_granularity,
348 .maxlen = sizeof(unsigned int),
350 .proc_handler = sched_proc_update_handler,
351 .extra1 = &min_sched_granularity_ns,
352 .extra2 = &max_sched_granularity_ns,
355 .procname = "sched_latency_ns",
356 .data = &sysctl_sched_latency,
357 .maxlen = sizeof(unsigned int),
359 .proc_handler = sched_proc_update_handler,
360 .extra1 = &min_sched_granularity_ns,
361 .extra2 = &max_sched_granularity_ns,
364 .procname = "sched_wakeup_granularity_ns",
365 .data = &sysctl_sched_wakeup_granularity,
366 .maxlen = sizeof(unsigned int),
368 .proc_handler = sched_proc_update_handler,
369 .extra1 = &min_wakeup_granularity_ns,
370 .extra2 = &max_wakeup_granularity_ns,
374 .procname = "sched_tunable_scaling",
375 .data = &sysctl_sched_tunable_scaling,
376 .maxlen = sizeof(enum sched_tunable_scaling),
378 .proc_handler = sched_proc_update_handler,
379 .extra1 = &min_sched_tunable_scaling,
380 .extra2 = &max_sched_tunable_scaling,
383 .procname = "sched_migration_cost_ns",
384 .data = &sysctl_sched_migration_cost,
385 .maxlen = sizeof(unsigned int),
387 .proc_handler = proc_dointvec,
390 .procname = "sched_nr_migrate",
391 .data = &sysctl_sched_nr_migrate,
392 .maxlen = sizeof(unsigned int),
394 .proc_handler = proc_dointvec,
397 .procname = "sched_time_avg_ms",
398 .data = &sysctl_sched_time_avg,
399 .maxlen = sizeof(unsigned int),
401 .proc_handler = proc_dointvec_minmax,
404 #ifdef CONFIG_SCHEDSTATS
406 .procname = "sched_schedstats",
408 .maxlen = sizeof(unsigned int),
410 .proc_handler = sysctl_schedstats,
414 #endif /* CONFIG_SCHEDSTATS */
415 #endif /* CONFIG_SMP */
416 #ifdef CONFIG_NUMA_BALANCING
418 .procname = "numa_balancing_scan_delay_ms",
419 .data = &sysctl_numa_balancing_scan_delay,
420 .maxlen = sizeof(unsigned int),
422 .proc_handler = proc_dointvec,
425 .procname = "numa_balancing_scan_period_min_ms",
426 .data = &sysctl_numa_balancing_scan_period_min,
427 .maxlen = sizeof(unsigned int),
429 .proc_handler = proc_dointvec,
432 .procname = "numa_balancing_scan_period_max_ms",
433 .data = &sysctl_numa_balancing_scan_period_max,
434 .maxlen = sizeof(unsigned int),
436 .proc_handler = proc_dointvec,
439 .procname = "numa_balancing_scan_size_mb",
440 .data = &sysctl_numa_balancing_scan_size,
441 .maxlen = sizeof(unsigned int),
443 .proc_handler = proc_dointvec_minmax,
447 .procname = "numa_balancing",
448 .data = NULL, /* filled in by handler */
449 .maxlen = sizeof(unsigned int),
451 .proc_handler = sysctl_numa_balancing,
455 #endif /* CONFIG_NUMA_BALANCING */
456 #endif /* CONFIG_SCHED_DEBUG */
458 .procname = "sched_rt_period_us",
459 .data = &sysctl_sched_rt_period,
460 .maxlen = sizeof(unsigned int),
462 .proc_handler = sched_rt_handler,
465 .procname = "sched_rt_runtime_us",
466 .data = &sysctl_sched_rt_runtime,
467 .maxlen = sizeof(int),
469 .proc_handler = sched_rt_handler,
472 .procname = "sched_rr_timeslice_ms",
473 .data = &sysctl_sched_rr_timeslice,
474 .maxlen = sizeof(int),
476 .proc_handler = sched_rr_handler,
478 #ifdef CONFIG_SCHED_AUTOGROUP
480 .procname = "sched_autogroup_enabled",
481 .data = &sysctl_sched_autogroup_enabled,
482 .maxlen = sizeof(unsigned int),
484 .proc_handler = proc_dointvec_minmax,
489 #ifdef CONFIG_CFS_BANDWIDTH
491 .procname = "sched_cfs_bandwidth_slice_us",
492 .data = &sysctl_sched_cfs_bandwidth_slice,
493 .maxlen = sizeof(unsigned int),
495 .proc_handler = proc_dointvec_minmax,
499 #ifdef CONFIG_PROVE_LOCKING
501 .procname = "prove_locking",
502 .data = &prove_locking,
503 .maxlen = sizeof(int),
505 .proc_handler = proc_dointvec,
508 #ifdef CONFIG_LOCK_STAT
510 .procname = "lock_stat",
512 .maxlen = sizeof(int),
514 .proc_handler = proc_dointvec,
519 .data = &panic_timeout,
520 .maxlen = sizeof(int),
522 .proc_handler = proc_dointvec,
524 #ifdef CONFIG_COREDUMP
526 .procname = "core_uses_pid",
527 .data = &core_uses_pid,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec,
533 .procname = "core_pattern",
534 .data = core_pattern,
535 .maxlen = CORENAME_MAX_SIZE,
537 .proc_handler = proc_dostring_coredump,
540 .procname = "core_pipe_limit",
541 .data = &core_pipe_limit,
542 .maxlen = sizeof(unsigned int),
544 .proc_handler = proc_dointvec,
547 #ifdef CONFIG_PROC_SYSCTL
549 .procname = "tainted",
550 .maxlen = sizeof(long),
552 .proc_handler = proc_taint,
555 .procname = "sysctl_writes_strict",
556 .data = &sysctl_writes_strict,
557 .maxlen = sizeof(int),
559 .proc_handler = proc_dointvec_minmax,
564 #ifdef CONFIG_LATENCYTOP
566 .procname = "latencytop",
567 .data = &latencytop_enabled,
568 .maxlen = sizeof(int),
570 .proc_handler = sysctl_latencytop,
573 #ifdef CONFIG_BLK_DEV_INITRD
575 .procname = "real-root-dev",
576 .data = &real_root_dev,
577 .maxlen = sizeof(int),
579 .proc_handler = proc_dointvec,
583 .procname = "print-fatal-signals",
584 .data = &print_fatal_signals,
585 .maxlen = sizeof(int),
587 .proc_handler = proc_dointvec,
591 .procname = "reboot-cmd",
592 .data = reboot_command,
595 .proc_handler = proc_dostring,
598 .procname = "stop-a",
599 .data = &stop_a_enabled,
600 .maxlen = sizeof (int),
602 .proc_handler = proc_dointvec,
605 .procname = "scons-poweroff",
606 .data = &scons_pwroff,
607 .maxlen = sizeof (int),
609 .proc_handler = proc_dointvec,
612 #ifdef CONFIG_SPARC64
614 .procname = "tsb-ratio",
615 .data = &sysctl_tsb_ratio,
616 .maxlen = sizeof (int),
618 .proc_handler = proc_dointvec,
623 .procname = "soft-power",
624 .data = &pwrsw_enabled,
625 .maxlen = sizeof (int),
627 .proc_handler = proc_dointvec,
630 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
632 .procname = "unaligned-trap",
633 .data = &unaligned_enabled,
634 .maxlen = sizeof (int),
636 .proc_handler = proc_dointvec,
640 .procname = "ctrl-alt-del",
642 .maxlen = sizeof(int),
644 .proc_handler = proc_dointvec,
646 #ifdef CONFIG_FUNCTION_TRACER
648 .procname = "ftrace_enabled",
649 .data = &ftrace_enabled,
650 .maxlen = sizeof(int),
652 .proc_handler = ftrace_enable_sysctl,
655 #ifdef CONFIG_STACK_TRACER
657 .procname = "stack_tracer_enabled",
658 .data = &stack_tracer_enabled,
659 .maxlen = sizeof(int),
661 .proc_handler = stack_trace_sysctl,
664 #ifdef CONFIG_TRACING
666 .procname = "ftrace_dump_on_oops",
667 .data = &ftrace_dump_on_oops,
668 .maxlen = sizeof(int),
670 .proc_handler = proc_dointvec,
673 .procname = "traceoff_on_warning",
674 .data = &__disable_trace_on_warning,
675 .maxlen = sizeof(__disable_trace_on_warning),
677 .proc_handler = proc_dointvec,
680 .procname = "tracepoint_printk",
681 .data = &tracepoint_printk,
682 .maxlen = sizeof(tracepoint_printk),
684 .proc_handler = tracepoint_printk_sysctl,
687 #ifdef CONFIG_KEXEC_CORE
689 .procname = "kexec_load_disabled",
690 .data = &kexec_load_disabled,
691 .maxlen = sizeof(int),
693 /* only handle a transition from default "0" to "1" */
694 .proc_handler = proc_dointvec_minmax,
699 #ifdef CONFIG_MODULES
701 .procname = "modprobe",
702 .data = &modprobe_path,
703 .maxlen = KMOD_PATH_LEN,
705 .proc_handler = proc_dostring,
708 .procname = "modules_disabled",
709 .data = &modules_disabled,
710 .maxlen = sizeof(int),
712 /* only handle a transition from default "0" to "1" */
713 .proc_handler = proc_dointvec_minmax,
718 #ifdef CONFIG_UEVENT_HELPER
720 .procname = "hotplug",
721 .data = &uevent_helper,
722 .maxlen = UEVENT_HELPER_PATH_LEN,
724 .proc_handler = proc_dostring,
727 #ifdef CONFIG_CHR_DEV_SG
729 .procname = "sg-big-buff",
730 .data = &sg_big_buff,
731 .maxlen = sizeof (int),
733 .proc_handler = proc_dointvec,
736 #ifdef CONFIG_BSD_PROCESS_ACCT
740 .maxlen = 3*sizeof(int),
742 .proc_handler = proc_dointvec,
745 #ifdef CONFIG_MAGIC_SYSRQ
748 .data = &__sysrq_enabled,
749 .maxlen = sizeof (int),
751 .proc_handler = sysrq_sysctl_handler,
754 #ifdef CONFIG_PROC_SYSCTL
756 .procname = "cad_pid",
758 .maxlen = sizeof (int),
760 .proc_handler = proc_do_cad_pid,
764 .procname = "threads-max",
766 .maxlen = sizeof(int),
768 .proc_handler = sysctl_max_threads,
771 .procname = "random",
773 .child = random_table,
776 .procname = "usermodehelper",
778 .child = usermodehelper_table,
781 .procname = "overflowuid",
782 .data = &overflowuid,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec_minmax,
786 .extra1 = &minolduid,
787 .extra2 = &maxolduid,
790 .procname = "overflowgid",
791 .data = &overflowgid,
792 .maxlen = sizeof(int),
794 .proc_handler = proc_dointvec_minmax,
795 .extra1 = &minolduid,
796 .extra2 = &maxolduid,
799 #ifdef CONFIG_MATHEMU
801 .procname = "ieee_emulation_warnings",
802 .data = &sysctl_ieee_emulation_warnings,
803 .maxlen = sizeof(int),
805 .proc_handler = proc_dointvec,
809 .procname = "userprocess_debug",
810 .data = &show_unhandled_signals,
811 .maxlen = sizeof(int),
813 .proc_handler = proc_dointvec,
817 .procname = "pid_max",
819 .maxlen = sizeof (int),
821 .proc_handler = proc_dointvec_minmax,
822 .extra1 = &pid_max_min,
823 .extra2 = &pid_max_max,
826 .procname = "panic_on_oops",
827 .data = &panic_on_oops,
828 .maxlen = sizeof(int),
830 .proc_handler = proc_dointvec,
832 #if defined CONFIG_PRINTK
834 .procname = "printk",
835 .data = &console_loglevel,
836 .maxlen = 4*sizeof(int),
838 .proc_handler = proc_dointvec,
841 .procname = "printk_ratelimit",
842 .data = &printk_ratelimit_state.interval,
843 .maxlen = sizeof(int),
845 .proc_handler = proc_dointvec_jiffies,
848 .procname = "printk_ratelimit_burst",
849 .data = &printk_ratelimit_state.burst,
850 .maxlen = sizeof(int),
852 .proc_handler = proc_dointvec,
855 .procname = "printk_delay",
856 .data = &printk_delay_msec,
857 .maxlen = sizeof(int),
859 .proc_handler = proc_dointvec_minmax,
861 .extra2 = &ten_thousand,
864 .procname = "printk_devkmsg",
865 .data = devkmsg_log_str,
866 .maxlen = DEVKMSG_STR_MAX_SIZE,
868 .proc_handler = devkmsg_sysctl_set_loglvl,
871 .procname = "dmesg_restrict",
872 .data = &dmesg_restrict,
873 .maxlen = sizeof(int),
875 .proc_handler = proc_dointvec_minmax_sysadmin,
880 .procname = "kptr_restrict",
881 .data = &kptr_restrict,
882 .maxlen = sizeof(int),
884 .proc_handler = proc_dointvec_minmax_sysadmin,
890 .procname = "ngroups_max",
891 .data = &ngroups_max,
892 .maxlen = sizeof (int),
894 .proc_handler = proc_dointvec,
897 .procname = "cap_last_cap",
898 .data = (void *)&cap_last_cap,
899 .maxlen = sizeof(int),
901 .proc_handler = proc_dointvec,
903 #if defined(CONFIG_LOCKUP_DETECTOR)
905 .procname = "watchdog",
906 .data = &watchdog_user_enabled,
907 .maxlen = sizeof(int),
909 .proc_handler = proc_watchdog,
914 .procname = "watchdog_thresh",
915 .data = &watchdog_thresh,
916 .maxlen = sizeof(int),
918 .proc_handler = proc_watchdog_thresh,
923 .procname = "nmi_watchdog",
924 .data = &nmi_watchdog_user_enabled,
925 .maxlen = sizeof(int),
926 .mode = NMI_WATCHDOG_SYSCTL_PERM,
927 .proc_handler = proc_nmi_watchdog,
932 .procname = "watchdog_cpumask",
933 .data = &watchdog_cpumask_bits,
936 .proc_handler = proc_watchdog_cpumask,
938 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
940 .procname = "soft_watchdog",
941 .data = &soft_watchdog_user_enabled,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_soft_watchdog,
949 .procname = "softlockup_panic",
950 .data = &softlockup_panic,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec_minmax,
959 .procname = "softlockup_all_cpu_backtrace",
960 .data = &sysctl_softlockup_all_cpu_backtrace,
961 .maxlen = sizeof(int),
963 .proc_handler = proc_dointvec_minmax,
967 #endif /* CONFIG_SMP */
969 #ifdef CONFIG_HARDLOCKUP_DETECTOR
971 .procname = "hardlockup_panic",
972 .data = &hardlockup_panic,
973 .maxlen = sizeof(int),
975 .proc_handler = proc_dointvec_minmax,
981 .procname = "hardlockup_all_cpu_backtrace",
982 .data = &sysctl_hardlockup_all_cpu_backtrace,
983 .maxlen = sizeof(int),
985 .proc_handler = proc_dointvec_minmax,
989 #endif /* CONFIG_SMP */
993 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
995 .procname = "unknown_nmi_panic",
996 .data = &unknown_nmi_panic,
997 .maxlen = sizeof (int),
999 .proc_handler = proc_dointvec,
1002 #if defined(CONFIG_X86)
1004 .procname = "panic_on_unrecovered_nmi",
1005 .data = &panic_on_unrecovered_nmi,
1006 .maxlen = sizeof(int),
1008 .proc_handler = proc_dointvec,
1011 .procname = "panic_on_io_nmi",
1012 .data = &panic_on_io_nmi,
1013 .maxlen = sizeof(int),
1015 .proc_handler = proc_dointvec,
1017 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1019 .procname = "panic_on_stackoverflow",
1020 .data = &sysctl_panic_on_stackoverflow,
1021 .maxlen = sizeof(int),
1023 .proc_handler = proc_dointvec,
1027 .procname = "bootloader_type",
1028 .data = &bootloader_type,
1029 .maxlen = sizeof (int),
1031 .proc_handler = proc_dointvec,
1034 .procname = "bootloader_version",
1035 .data = &bootloader_version,
1036 .maxlen = sizeof (int),
1038 .proc_handler = proc_dointvec,
1041 .procname = "io_delay_type",
1042 .data = &io_delay_type,
1043 .maxlen = sizeof(int),
1045 .proc_handler = proc_dointvec,
1048 #if defined(CONFIG_MMU)
1050 .procname = "randomize_va_space",
1051 .data = &randomize_va_space,
1052 .maxlen = sizeof(int),
1054 .proc_handler = proc_dointvec,
1057 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1059 .procname = "spin_retry",
1060 .data = &spin_retry,
1061 .maxlen = sizeof (int),
1063 .proc_handler = proc_dointvec,
1066 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1068 .procname = "acpi_video_flags",
1069 .data = &acpi_realmode_flags,
1070 .maxlen = sizeof (unsigned long),
1072 .proc_handler = proc_doulongvec_minmax,
1075 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1077 .procname = "ignore-unaligned-usertrap",
1078 .data = &no_unaligned_warning,
1079 .maxlen = sizeof (int),
1081 .proc_handler = proc_dointvec,
1086 .procname = "unaligned-dump-stack",
1087 .data = &unaligned_dump_stack,
1088 .maxlen = sizeof (int),
1090 .proc_handler = proc_dointvec,
1093 #ifdef CONFIG_DETECT_HUNG_TASK
1095 .procname = "hung_task_panic",
1096 .data = &sysctl_hung_task_panic,
1097 .maxlen = sizeof(int),
1099 .proc_handler = proc_dointvec_minmax,
1104 .procname = "hung_task_check_count",
1105 .data = &sysctl_hung_task_check_count,
1106 .maxlen = sizeof(int),
1108 .proc_handler = proc_dointvec_minmax,
1112 .procname = "hung_task_timeout_secs",
1113 .data = &sysctl_hung_task_timeout_secs,
1114 .maxlen = sizeof(unsigned long),
1116 .proc_handler = proc_dohung_task_timeout_secs,
1117 .extra2 = &hung_task_timeout_max,
1120 .procname = "hung_task_warnings",
1121 .data = &sysctl_hung_task_warnings,
1122 .maxlen = sizeof(int),
1124 .proc_handler = proc_dointvec_minmax,
1128 #ifdef CONFIG_RT_MUTEXES
1130 .procname = "max_lock_depth",
1131 .data = &max_lock_depth,
1132 .maxlen = sizeof(int),
1134 .proc_handler = proc_dointvec,
1138 .procname = "poweroff_cmd",
1139 .data = &poweroff_cmd,
1140 .maxlen = POWEROFF_CMD_PATH_LEN,
1142 .proc_handler = proc_dostring,
1148 .child = key_sysctls,
1151 #ifdef CONFIG_PERF_EVENTS
1153 * User-space scripts rely on the existence of this file
1154 * as a feature check for perf_events being enabled.
1156 * So it's an ABI, do not remove!
1159 .procname = "perf_event_paranoid",
1160 .data = &sysctl_perf_event_paranoid,
1161 .maxlen = sizeof(sysctl_perf_event_paranoid),
1163 .proc_handler = proc_dointvec,
1166 .procname = "perf_event_mlock_kb",
1167 .data = &sysctl_perf_event_mlock,
1168 .maxlen = sizeof(sysctl_perf_event_mlock),
1170 .proc_handler = proc_dointvec,
1173 .procname = "perf_event_max_sample_rate",
1174 .data = &sysctl_perf_event_sample_rate,
1175 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1177 .proc_handler = perf_proc_update_handler,
1181 .procname = "perf_cpu_time_max_percent",
1182 .data = &sysctl_perf_cpu_time_max_percent,
1183 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1185 .proc_handler = perf_cpu_time_max_percent_handler,
1187 .extra2 = &one_hundred,
1190 .procname = "perf_event_max_stack",
1191 .data = &sysctl_perf_event_max_stack,
1192 .maxlen = sizeof(sysctl_perf_event_max_stack),
1194 .proc_handler = perf_event_max_stack_handler,
1196 .extra2 = &six_hundred_forty_kb,
1199 .procname = "perf_event_max_contexts_per_stack",
1200 .data = &sysctl_perf_event_max_contexts_per_stack,
1201 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1203 .proc_handler = perf_event_max_stack_handler,
1205 .extra2 = &one_thousand,
1209 .procname = "panic_on_warn",
1210 .data = &panic_on_warn,
1211 .maxlen = sizeof(int),
1213 .proc_handler = proc_dointvec_minmax,
1217 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1219 .procname = "timer_migration",
1220 .data = &sysctl_timer_migration,
1221 .maxlen = sizeof(unsigned int),
1223 .proc_handler = timer_migration_handler,
1228 #ifdef CONFIG_BPF_SYSCALL
1230 .procname = "unprivileged_bpf_disabled",
1231 .data = &sysctl_unprivileged_bpf_disabled,
1232 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1234 .proc_handler = bpf_unpriv_handler,
1239 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1241 .procname = "panic_on_rcu_stall",
1242 .data = &sysctl_panic_on_rcu_stall,
1243 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1245 .proc_handler = proc_dointvec_minmax,
1253 static struct ctl_table vm_table[] = {
1255 .procname = "overcommit_memory",
1256 .data = &sysctl_overcommit_memory,
1257 .maxlen = sizeof(sysctl_overcommit_memory),
1259 .proc_handler = proc_dointvec_minmax,
1264 .procname = "panic_on_oom",
1265 .data = &sysctl_panic_on_oom,
1266 .maxlen = sizeof(sysctl_panic_on_oom),
1268 .proc_handler = proc_dointvec_minmax,
1273 .procname = "oom_kill_allocating_task",
1274 .data = &sysctl_oom_kill_allocating_task,
1275 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1277 .proc_handler = proc_dointvec,
1280 .procname = "oom_dump_tasks",
1281 .data = &sysctl_oom_dump_tasks,
1282 .maxlen = sizeof(sysctl_oom_dump_tasks),
1284 .proc_handler = proc_dointvec,
1287 .procname = "overcommit_ratio",
1288 .data = &sysctl_overcommit_ratio,
1289 .maxlen = sizeof(sysctl_overcommit_ratio),
1291 .proc_handler = overcommit_ratio_handler,
1294 .procname = "overcommit_kbytes",
1295 .data = &sysctl_overcommit_kbytes,
1296 .maxlen = sizeof(sysctl_overcommit_kbytes),
1298 .proc_handler = overcommit_kbytes_handler,
1301 .procname = "page-cluster",
1302 .data = &page_cluster,
1303 .maxlen = sizeof(int),
1305 .proc_handler = proc_dointvec_minmax,
1309 .procname = "dirty_background_ratio",
1310 .data = &dirty_background_ratio,
1311 .maxlen = sizeof(dirty_background_ratio),
1313 .proc_handler = dirty_background_ratio_handler,
1315 .extra2 = &one_hundred,
1318 .procname = "dirty_background_bytes",
1319 .data = &dirty_background_bytes,
1320 .maxlen = sizeof(dirty_background_bytes),
1322 .proc_handler = dirty_background_bytes_handler,
1326 .procname = "dirty_ratio",
1327 .data = &vm_dirty_ratio,
1328 .maxlen = sizeof(vm_dirty_ratio),
1330 .proc_handler = dirty_ratio_handler,
1332 .extra2 = &one_hundred,
1335 .procname = "dirty_bytes",
1336 .data = &vm_dirty_bytes,
1337 .maxlen = sizeof(vm_dirty_bytes),
1339 .proc_handler = dirty_bytes_handler,
1340 .extra1 = &dirty_bytes_min,
1343 .procname = "dirty_writeback_centisecs",
1344 .data = &dirty_writeback_interval,
1345 .maxlen = sizeof(dirty_writeback_interval),
1347 .proc_handler = dirty_writeback_centisecs_handler,
1350 .procname = "dirty_expire_centisecs",
1351 .data = &dirty_expire_interval,
1352 .maxlen = sizeof(dirty_expire_interval),
1354 .proc_handler = proc_dointvec_minmax,
1358 .procname = "dirtytime_expire_seconds",
1359 .data = &dirtytime_expire_interval,
1360 .maxlen = sizeof(dirty_expire_interval),
1362 .proc_handler = dirtytime_interval_handler,
1366 .procname = "nr_pdflush_threads",
1367 .mode = 0444 /* read-only */,
1368 .proc_handler = pdflush_proc_obsolete,
1371 .procname = "swappiness",
1372 .data = &vm_swappiness,
1373 .maxlen = sizeof(vm_swappiness),
1375 .proc_handler = proc_dointvec_minmax,
1377 .extra2 = &one_hundred,
1379 #ifdef CONFIG_HUGETLB_PAGE
1381 .procname = "nr_hugepages",
1383 .maxlen = sizeof(unsigned long),
1385 .proc_handler = hugetlb_sysctl_handler,
1389 .procname = "nr_hugepages_mempolicy",
1391 .maxlen = sizeof(unsigned long),
1393 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1397 .procname = "hugetlb_shm_group",
1398 .data = &sysctl_hugetlb_shm_group,
1399 .maxlen = sizeof(gid_t),
1401 .proc_handler = proc_dointvec,
1404 .procname = "hugepages_treat_as_movable",
1405 .data = &hugepages_treat_as_movable,
1406 .maxlen = sizeof(int),
1408 .proc_handler = proc_dointvec,
1411 .procname = "nr_overcommit_hugepages",
1413 .maxlen = sizeof(unsigned long),
1415 .proc_handler = hugetlb_overcommit_handler,
1419 .procname = "lowmem_reserve_ratio",
1420 .data = &sysctl_lowmem_reserve_ratio,
1421 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1423 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1426 .procname = "drop_caches",
1427 .data = &sysctl_drop_caches,
1428 .maxlen = sizeof(int),
1430 .proc_handler = drop_caches_sysctl_handler,
1434 #ifdef CONFIG_COMPACTION
1436 .procname = "compact_memory",
1437 .data = &sysctl_compact_memory,
1438 .maxlen = sizeof(int),
1440 .proc_handler = sysctl_compaction_handler,
1443 .procname = "extfrag_threshold",
1444 .data = &sysctl_extfrag_threshold,
1445 .maxlen = sizeof(int),
1447 .proc_handler = sysctl_extfrag_handler,
1448 .extra1 = &min_extfrag_threshold,
1449 .extra2 = &max_extfrag_threshold,
1452 .procname = "compact_unevictable_allowed",
1453 .data = &sysctl_compact_unevictable_allowed,
1454 .maxlen = sizeof(int),
1456 .proc_handler = proc_dointvec,
1461 #endif /* CONFIG_COMPACTION */
1463 .procname = "min_free_kbytes",
1464 .data = &min_free_kbytes,
1465 .maxlen = sizeof(min_free_kbytes),
1467 .proc_handler = min_free_kbytes_sysctl_handler,
1471 .procname = "watermark_scale_factor",
1472 .data = &watermark_scale_factor,
1473 .maxlen = sizeof(watermark_scale_factor),
1475 .proc_handler = watermark_scale_factor_sysctl_handler,
1477 .extra2 = &one_thousand,
1480 .procname = "percpu_pagelist_fraction",
1481 .data = &percpu_pagelist_fraction,
1482 .maxlen = sizeof(percpu_pagelist_fraction),
1484 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1489 .procname = "max_map_count",
1490 .data = &sysctl_max_map_count,
1491 .maxlen = sizeof(sysctl_max_map_count),
1493 .proc_handler = proc_dointvec_minmax,
1498 .procname = "nr_trim_pages",
1499 .data = &sysctl_nr_trim_pages,
1500 .maxlen = sizeof(sysctl_nr_trim_pages),
1502 .proc_handler = proc_dointvec_minmax,
1507 .procname = "laptop_mode",
1508 .data = &laptop_mode,
1509 .maxlen = sizeof(laptop_mode),
1511 .proc_handler = proc_dointvec_jiffies,
1514 .procname = "block_dump",
1515 .data = &block_dump,
1516 .maxlen = sizeof(block_dump),
1518 .proc_handler = proc_dointvec,
1522 .procname = "vfs_cache_pressure",
1523 .data = &sysctl_vfs_cache_pressure,
1524 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1526 .proc_handler = proc_dointvec,
1529 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1531 .procname = "legacy_va_layout",
1532 .data = &sysctl_legacy_va_layout,
1533 .maxlen = sizeof(sysctl_legacy_va_layout),
1535 .proc_handler = proc_dointvec,
1541 .procname = "zone_reclaim_mode",
1542 .data = &node_reclaim_mode,
1543 .maxlen = sizeof(node_reclaim_mode),
1545 .proc_handler = proc_dointvec,
1549 .procname = "min_unmapped_ratio",
1550 .data = &sysctl_min_unmapped_ratio,
1551 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1553 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1555 .extra2 = &one_hundred,
1558 .procname = "min_slab_ratio",
1559 .data = &sysctl_min_slab_ratio,
1560 .maxlen = sizeof(sysctl_min_slab_ratio),
1562 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1564 .extra2 = &one_hundred,
1569 .procname = "stat_interval",
1570 .data = &sysctl_stat_interval,
1571 .maxlen = sizeof(sysctl_stat_interval),
1573 .proc_handler = proc_dointvec_jiffies,
1576 .procname = "stat_refresh",
1580 .proc_handler = vmstat_refresh,
1585 .procname = "mmap_min_addr",
1586 .data = &dac_mmap_min_addr,
1587 .maxlen = sizeof(unsigned long),
1589 .proc_handler = mmap_min_addr_handler,
1594 .procname = "numa_zonelist_order",
1595 .data = &numa_zonelist_order,
1596 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1598 .proc_handler = numa_zonelist_order_handler,
1601 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1602 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1604 .procname = "vdso_enabled",
1605 #ifdef CONFIG_X86_32
1606 .data = &vdso32_enabled,
1607 .maxlen = sizeof(vdso32_enabled),
1609 .data = &vdso_enabled,
1610 .maxlen = sizeof(vdso_enabled),
1613 .proc_handler = proc_dointvec,
1617 #ifdef CONFIG_HIGHMEM
1619 .procname = "highmem_is_dirtyable",
1620 .data = &vm_highmem_is_dirtyable,
1621 .maxlen = sizeof(vm_highmem_is_dirtyable),
1623 .proc_handler = proc_dointvec_minmax,
1628 #ifdef CONFIG_MEMORY_FAILURE
1630 .procname = "memory_failure_early_kill",
1631 .data = &sysctl_memory_failure_early_kill,
1632 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1634 .proc_handler = proc_dointvec_minmax,
1639 .procname = "memory_failure_recovery",
1640 .data = &sysctl_memory_failure_recovery,
1641 .maxlen = sizeof(sysctl_memory_failure_recovery),
1643 .proc_handler = proc_dointvec_minmax,
1649 .procname = "user_reserve_kbytes",
1650 .data = &sysctl_user_reserve_kbytes,
1651 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1653 .proc_handler = proc_doulongvec_minmax,
1656 .procname = "admin_reserve_kbytes",
1657 .data = &sysctl_admin_reserve_kbytes,
1658 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1660 .proc_handler = proc_doulongvec_minmax,
1662 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1664 .procname = "mmap_rnd_bits",
1665 .data = &mmap_rnd_bits,
1666 .maxlen = sizeof(mmap_rnd_bits),
1668 .proc_handler = proc_dointvec_minmax,
1669 .extra1 = (void *)&mmap_rnd_bits_min,
1670 .extra2 = (void *)&mmap_rnd_bits_max,
1673 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1675 .procname = "mmap_rnd_compat_bits",
1676 .data = &mmap_rnd_compat_bits,
1677 .maxlen = sizeof(mmap_rnd_compat_bits),
1679 .proc_handler = proc_dointvec_minmax,
1680 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1681 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1687 static struct ctl_table fs_table[] = {
1689 .procname = "inode-nr",
1690 .data = &inodes_stat,
1691 .maxlen = 2*sizeof(long),
1693 .proc_handler = proc_nr_inodes,
1696 .procname = "inode-state",
1697 .data = &inodes_stat,
1698 .maxlen = 7*sizeof(long),
1700 .proc_handler = proc_nr_inodes,
1703 .procname = "file-nr",
1704 .data = &files_stat,
1705 .maxlen = sizeof(files_stat),
1707 .proc_handler = proc_nr_files,
1710 .procname = "file-max",
1711 .data = &files_stat.max_files,
1712 .maxlen = sizeof(files_stat.max_files),
1714 .proc_handler = proc_doulongvec_minmax,
1716 .extra2 = &long_max,
1719 .procname = "nr_open",
1720 .data = &sysctl_nr_open,
1721 .maxlen = sizeof(unsigned int),
1723 .proc_handler = proc_dointvec_minmax,
1724 .extra1 = &sysctl_nr_open_min,
1725 .extra2 = &sysctl_nr_open_max,
1728 .procname = "dentry-state",
1729 .data = &dentry_stat,
1730 .maxlen = 6*sizeof(long),
1732 .proc_handler = proc_nr_dentry,
1735 .procname = "overflowuid",
1736 .data = &fs_overflowuid,
1737 .maxlen = sizeof(int),
1739 .proc_handler = proc_dointvec_minmax,
1740 .extra1 = &minolduid,
1741 .extra2 = &maxolduid,
1744 .procname = "overflowgid",
1745 .data = &fs_overflowgid,
1746 .maxlen = sizeof(int),
1748 .proc_handler = proc_dointvec_minmax,
1749 .extra1 = &minolduid,
1750 .extra2 = &maxolduid,
1752 #ifdef CONFIG_FILE_LOCKING
1754 .procname = "leases-enable",
1755 .data = &leases_enable,
1756 .maxlen = sizeof(int),
1758 .proc_handler = proc_dointvec,
1761 #ifdef CONFIG_DNOTIFY
1763 .procname = "dir-notify-enable",
1764 .data = &dir_notify_enable,
1765 .maxlen = sizeof(int),
1767 .proc_handler = proc_dointvec,
1771 #ifdef CONFIG_FILE_LOCKING
1773 .procname = "lease-break-time",
1774 .data = &lease_break_time,
1775 .maxlen = sizeof(int),
1777 .proc_handler = proc_dointvec,
1782 .procname = "aio-nr",
1784 .maxlen = sizeof(aio_nr),
1786 .proc_handler = proc_doulongvec_minmax,
1789 .procname = "aio-max-nr",
1790 .data = &aio_max_nr,
1791 .maxlen = sizeof(aio_max_nr),
1793 .proc_handler = proc_doulongvec_minmax,
1795 #endif /* CONFIG_AIO */
1796 #ifdef CONFIG_INOTIFY_USER
1798 .procname = "inotify",
1800 .child = inotify_table,
1805 .procname = "epoll",
1807 .child = epoll_table,
1812 .procname = "protected_symlinks",
1813 .data = &sysctl_protected_symlinks,
1814 .maxlen = sizeof(int),
1816 .proc_handler = proc_dointvec_minmax,
1821 .procname = "protected_hardlinks",
1822 .data = &sysctl_protected_hardlinks,
1823 .maxlen = sizeof(int),
1825 .proc_handler = proc_dointvec_minmax,
1830 .procname = "protected_fifos",
1831 .data = &sysctl_protected_fifos,
1832 .maxlen = sizeof(int),
1834 .proc_handler = proc_dointvec_minmax,
1839 .procname = "protected_regular",
1840 .data = &sysctl_protected_regular,
1841 .maxlen = sizeof(int),
1843 .proc_handler = proc_dointvec_minmax,
1848 .procname = "suid_dumpable",
1849 .data = &suid_dumpable,
1850 .maxlen = sizeof(int),
1852 .proc_handler = proc_dointvec_minmax_coredump,
1856 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1858 .procname = "binfmt_misc",
1860 .child = sysctl_mount_point,
1864 .procname = "pipe-max-size",
1865 .data = &pipe_max_size,
1866 .maxlen = sizeof(pipe_max_size),
1868 .proc_handler = &pipe_proc_fn,
1869 .extra1 = &pipe_min_size,
1872 .procname = "pipe-user-pages-hard",
1873 .data = &pipe_user_pages_hard,
1874 .maxlen = sizeof(pipe_user_pages_hard),
1876 .proc_handler = proc_doulongvec_minmax,
1879 .procname = "pipe-user-pages-soft",
1880 .data = &pipe_user_pages_soft,
1881 .maxlen = sizeof(pipe_user_pages_soft),
1883 .proc_handler = proc_doulongvec_minmax,
1886 .procname = "mount-max",
1887 .data = &sysctl_mount_max,
1888 .maxlen = sizeof(unsigned int),
1890 .proc_handler = proc_dointvec_minmax,
1896 static struct ctl_table debug_table[] = {
1897 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1899 .procname = "exception-trace",
1900 .data = &show_unhandled_signals,
1901 .maxlen = sizeof(int),
1903 .proc_handler = proc_dointvec
1906 #if defined(CONFIG_OPTPROBES)
1908 .procname = "kprobes-optimization",
1909 .data = &sysctl_kprobes_optimization,
1910 .maxlen = sizeof(int),
1912 .proc_handler = proc_kprobes_optimization_handler,
1920 static struct ctl_table dev_table[] = {
1924 int __init sysctl_init(void)
1926 struct ctl_table_header *hdr;
1928 hdr = register_sysctl_table(sysctl_base_table);
1929 kmemleak_not_leak(hdr);
1933 #endif /* CONFIG_SYSCTL */
1939 #ifdef CONFIG_PROC_SYSCTL
1941 static int _proc_do_string(char *data, int maxlen, int write,
1942 char __user *buffer,
1943 size_t *lenp, loff_t *ppos)
1949 if (!data || !maxlen || !*lenp) {
1955 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1956 /* Only continue writes not past the end of buffer. */
1958 if (len > maxlen - 1)
1965 /* Start writing from beginning of buffer. */
1971 while ((p - buffer) < *lenp && len < maxlen - 1) {
1972 if (get_user(c, p++))
1974 if (c == 0 || c == '\n')
1995 if (copy_to_user(buffer, data, len))
1998 if (put_user('\n', buffer + len))
2008 static void warn_sysctl_write(struct ctl_table *table)
2010 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2011 "This will not be supported in the future. To silence this\n"
2012 "warning, set kernel.sysctl_writes_strict = -1\n",
2013 current->comm, table->procname);
2017 * proc_first_pos_non_zero_ignore - check if firs position is allowed
2018 * @ppos: file position
2019 * @table: the sysctl table
2021 * Returns true if the first position is non-zero and the sysctl_writes_strict
2022 * mode indicates this is not allowed for numeric input types. String proc
2023 * hadlers can ignore the return value.
2025 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2026 struct ctl_table *table)
2031 switch (sysctl_writes_strict) {
2032 case SYSCTL_WRITES_STRICT:
2034 case SYSCTL_WRITES_WARN:
2035 warn_sysctl_write(table);
2043 * proc_dostring - read a string sysctl
2044 * @table: the sysctl table
2045 * @write: %TRUE if this is a write to the sysctl file
2046 * @buffer: the user buffer
2047 * @lenp: the size of the user buffer
2048 * @ppos: file position
2050 * Reads/writes a string from/to the user buffer. If the kernel
2051 * buffer provided is not large enough to hold the string, the
2052 * string is truncated. The copied string is %NULL-terminated.
2053 * If the string is being read by the user process, it is copied
2054 * and a newline '\n' is added. It is truncated if the buffer is
2057 * Returns 0 on success.
2059 int proc_dostring(struct ctl_table *table, int write,
2060 void __user *buffer, size_t *lenp, loff_t *ppos)
2063 proc_first_pos_non_zero_ignore(ppos, table);
2065 return _proc_do_string((char *)(table->data), table->maxlen, write,
2066 (char __user *)buffer, lenp, ppos);
2069 static void proc_skip_spaces(char **buf, size_t *size)
2072 if (!isspace(**buf))
2079 static void proc_skip_char(char **buf, size_t *size, const char v)
2089 #define TMPBUFLEN 22
2091 * proc_get_long - reads an ASCII formatted integer from a user buffer
2093 * @buf: a kernel buffer
2094 * @size: size of the kernel buffer
2095 * @val: this is where the number will be stored
2096 * @neg: set to %TRUE if number is negative
2097 * @perm_tr: a vector which contains the allowed trailers
2098 * @perm_tr_len: size of the perm_tr vector
2099 * @tr: pointer to store the trailer character
2101 * In case of success %0 is returned and @buf and @size are updated with
2102 * the amount of bytes read. If @tr is non-NULL and a trailing
2103 * character exists (size is non-zero after returning from this
2104 * function), @tr is updated with the trailing character.
2106 static int proc_get_long(char **buf, size_t *size,
2107 unsigned long *val, bool *neg,
2108 const char *perm_tr, unsigned perm_tr_len, char *tr)
2110 char *p, tmp[TMPBUFLEN];
2111 ssize_t len = *size;
2116 if (len > TMPBUFLEN - 1)
2117 len = TMPBUFLEN - 1;
2119 memcpy(tmp, *buf, len);
2123 if (*p == '-' && *size > 1) {
2131 *val = simple_strtoul(p, &p, 0);
2135 /* We don't know if the next char is whitespace thus we may accept
2136 * invalid integers (e.g. 1234...a) or two integers instead of one
2137 * (e.g. 123...1). So lets not allow such large numbers. */
2138 if (len == TMPBUFLEN - 1)
2141 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2144 if (tr && (len < *size))
2154 * proc_put_long - converts an integer to a decimal ASCII formatted string
2156 * @buf: the user buffer
2157 * @size: the size of the user buffer
2158 * @val: the integer to be converted
2159 * @neg: sign of the number, %TRUE for negative
2161 * In case of success %0 is returned and @buf and @size are updated with
2162 * the amount of bytes written.
2164 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2168 char tmp[TMPBUFLEN], *p = tmp;
2170 sprintf(p, "%s%lu", neg ? "-" : "", val);
2174 if (copy_to_user(*buf, tmp, len))
2182 static int proc_put_char(void __user **buf, size_t *size, char c)
2185 char __user **buffer = (char __user **)buf;
2186 if (put_user(c, *buffer))
2188 (*size)--, (*buffer)++;
2194 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2196 int write, void *data)
2200 if (*lvalp > (unsigned long) INT_MAX + 1)
2204 if (*lvalp > (unsigned long) INT_MAX)
2212 *lvalp = -(unsigned long)val;
2215 *lvalp = (unsigned long)val;
2221 static int do_proc_douintvec_conv(unsigned long *lvalp,
2223 int write, void *data)
2226 if (*lvalp > UINT_MAX)
2230 unsigned int val = *valp;
2231 *lvalp = (unsigned long)val;
2236 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2238 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2239 int write, void __user *buffer,
2240 size_t *lenp, loff_t *ppos,
2241 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2242 int write, void *data),
2245 int *i, vleft, first = 1, err = 0;
2247 char *kbuf = NULL, *p;
2249 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2254 i = (int *) tbl_data;
2255 vleft = table->maxlen / sizeof(*i);
2259 conv = do_proc_dointvec_conv;
2262 if (proc_first_pos_non_zero_ignore(ppos, table))
2265 if (left > PAGE_SIZE - 1)
2266 left = PAGE_SIZE - 1;
2267 p = kbuf = memdup_user_nul(buffer, left);
2269 return PTR_ERR(kbuf);
2272 for (; left && vleft--; i++, first=0) {
2277 proc_skip_spaces(&p, &left);
2281 err = proc_get_long(&p, &left, &lval, &neg,
2283 sizeof(proc_wspace_sep), NULL);
2286 if (conv(&neg, &lval, i, 1, data)) {
2291 if (conv(&neg, &lval, i, 0, data)) {
2296 err = proc_put_char(&buffer, &left, '\t');
2299 err = proc_put_long(&buffer, &left, lval, neg);
2305 if (!write && !first && left && !err)
2306 err = proc_put_char(&buffer, &left, '\n');
2307 if (write && !err && left)
2308 proc_skip_spaces(&p, &left);
2312 return err ? : -EINVAL;
2320 static int do_proc_dointvec(struct ctl_table *table, int write,
2321 void __user *buffer, size_t *lenp, loff_t *ppos,
2322 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2323 int write, void *data),
2326 return __do_proc_dointvec(table->data, table, write,
2327 buffer, lenp, ppos, conv, data);
2330 static int do_proc_douintvec_w(unsigned int *tbl_data,
2331 struct ctl_table *table,
2332 void __user *buffer,
2333 size_t *lenp, loff_t *ppos,
2334 int (*conv)(unsigned long *lvalp,
2336 int write, void *data),
2343 char *kbuf = NULL, *p;
2347 if (proc_first_pos_non_zero_ignore(ppos, table))
2350 if (left > PAGE_SIZE - 1)
2351 left = PAGE_SIZE - 1;
2353 p = kbuf = memdup_user_nul(buffer, left);
2357 proc_skip_spaces(&p, &left);
2363 err = proc_get_long(&p, &left, &lval, &neg,
2365 sizeof(proc_wspace_sep), NULL);
2371 if (conv(&lval, tbl_data, 1, data)) {
2377 proc_skip_spaces(&p, &left);
2386 /* This is in keeping with old __do_proc_dointvec() */
2392 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2393 size_t *lenp, loff_t *ppos,
2394 int (*conv)(unsigned long *lvalp,
2396 int write, void *data),
2405 if (conv(&lval, tbl_data, 0, data)) {
2410 err = proc_put_long(&buffer, &left, lval, false);
2414 err = proc_put_char(&buffer, &left, '\n');
2423 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2424 int write, void __user *buffer,
2425 size_t *lenp, loff_t *ppos,
2426 int (*conv)(unsigned long *lvalp,
2428 int write, void *data),
2431 unsigned int *i, vleft;
2433 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2438 i = (unsigned int *) tbl_data;
2439 vleft = table->maxlen / sizeof(*i);
2442 * Arrays are not supported, keep this simple. *Do not* add
2451 conv = do_proc_douintvec_conv;
2454 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2456 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2459 static int do_proc_douintvec(struct ctl_table *table, int write,
2460 void __user *buffer, size_t *lenp, loff_t *ppos,
2461 int (*conv)(unsigned long *lvalp,
2463 int write, void *data),
2466 return __do_proc_douintvec(table->data, table, write,
2467 buffer, lenp, ppos, conv, data);
2471 * proc_dointvec - read a vector of integers
2472 * @table: the sysctl table
2473 * @write: %TRUE if this is a write to the sysctl file
2474 * @buffer: the user buffer
2475 * @lenp: the size of the user buffer
2476 * @ppos: file position
2478 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2479 * values from/to the user buffer, treated as an ASCII string.
2481 * Returns 0 on success.
2483 int proc_dointvec(struct ctl_table *table, int write,
2484 void __user *buffer, size_t *lenp, loff_t *ppos)
2486 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2490 * proc_douintvec - read a vector of unsigned integers
2491 * @table: the sysctl table
2492 * @write: %TRUE if this is a write to the sysctl file
2493 * @buffer: the user buffer
2494 * @lenp: the size of the user buffer
2495 * @ppos: file position
2497 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2498 * values from/to the user buffer, treated as an ASCII string.
2500 * Returns 0 on success.
2502 int proc_douintvec(struct ctl_table *table, int write,
2503 void __user *buffer, size_t *lenp, loff_t *ppos)
2505 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2506 do_proc_douintvec_conv, NULL);
2510 * Taint values can only be increased
2511 * This means we can safely use a temporary.
2513 static int proc_taint(struct ctl_table *table, int write,
2514 void __user *buffer, size_t *lenp, loff_t *ppos)
2517 unsigned long tmptaint = get_taint();
2520 if (write && !capable(CAP_SYS_ADMIN))
2525 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2531 * Poor man's atomic or. Not worth adding a primitive
2532 * to everyone's atomic.h for this
2535 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2536 if ((tmptaint >> i) & 1)
2537 add_taint(i, LOCKDEP_STILL_OK);
2544 #ifdef CONFIG_PRINTK
2545 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2546 void __user *buffer, size_t *lenp, loff_t *ppos)
2548 if (write && !capable(CAP_SYS_ADMIN))
2551 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2555 struct do_proc_dointvec_minmax_conv_param {
2560 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2562 int write, void *data)
2564 struct do_proc_dointvec_minmax_conv_param *param = data;
2568 if (*lvalp > (unsigned long) INT_MAX + 1)
2572 if (*lvalp > (unsigned long) INT_MAX)
2576 if ((param->min && *param->min > val) ||
2577 (param->max && *param->max < val))
2584 *lvalp = -(unsigned long)val;
2587 *lvalp = (unsigned long)val;
2594 * proc_dointvec_minmax - read a vector of integers with min/max values
2595 * @table: the sysctl table
2596 * @write: %TRUE if this is a write to the sysctl file
2597 * @buffer: the user buffer
2598 * @lenp: the size of the user buffer
2599 * @ppos: file position
2601 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2602 * values from/to the user buffer, treated as an ASCII string.
2604 * This routine will ensure the values are within the range specified by
2605 * table->extra1 (min) and table->extra2 (max).
2607 * Returns 0 on success.
2609 int proc_dointvec_minmax(struct ctl_table *table, int write,
2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2612 struct do_proc_dointvec_minmax_conv_param param = {
2613 .min = (int *) table->extra1,
2614 .max = (int *) table->extra2,
2616 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2617 do_proc_dointvec_minmax_conv, ¶m);
2620 struct do_proc_douintvec_minmax_conv_param {
2625 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2627 int write, void *data)
2629 struct do_proc_douintvec_minmax_conv_param *param = data;
2632 unsigned int val = *lvalp;
2634 if ((param->min && *param->min > val) ||
2635 (param->max && *param->max < val))
2638 if (*lvalp > UINT_MAX)
2642 unsigned int val = *valp;
2643 *lvalp = (unsigned long) val;
2650 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2651 * @table: the sysctl table
2652 * @write: %TRUE if this is a write to the sysctl file
2653 * @buffer: the user buffer
2654 * @lenp: the size of the user buffer
2655 * @ppos: file position
2657 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2658 * values from/to the user buffer, treated as an ASCII string. Negative
2659 * strings are not allowed.
2661 * This routine will ensure the values are within the range specified by
2662 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2663 * check for UINT_MAX to avoid having to support wrap around uses from
2666 * Returns 0 on success.
2668 int proc_douintvec_minmax(struct ctl_table *table, int write,
2669 void __user *buffer, size_t *lenp, loff_t *ppos)
2671 struct do_proc_douintvec_minmax_conv_param param = {
2672 .min = (unsigned int *) table->extra1,
2673 .max = (unsigned int *) table->extra2,
2675 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2676 do_proc_douintvec_minmax_conv, ¶m);
2679 static void validate_coredump_safety(void)
2681 #ifdef CONFIG_COREDUMP
2682 if (suid_dumpable == SUID_DUMP_ROOT &&
2683 core_pattern[0] != '/' && core_pattern[0] != '|') {
2685 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2686 "Pipe handler or fully qualified core dump path required.\n"
2687 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2693 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2694 void __user *buffer, size_t *lenp, loff_t *ppos)
2696 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2698 validate_coredump_safety();
2702 #ifdef CONFIG_COREDUMP
2703 static int proc_dostring_coredump(struct ctl_table *table, int write,
2704 void __user *buffer, size_t *lenp, loff_t *ppos)
2706 int error = proc_dostring(table, write, buffer, lenp, ppos);
2708 validate_coredump_safety();
2713 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2714 void __user *buffer,
2715 size_t *lenp, loff_t *ppos,
2716 unsigned long convmul,
2717 unsigned long convdiv)
2719 unsigned long *i, *min, *max;
2720 int vleft, first = 1, err = 0;
2722 char *kbuf = NULL, *p;
2724 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2729 i = (unsigned long *) data;
2730 min = (unsigned long *) table->extra1;
2731 max = (unsigned long *) table->extra2;
2732 vleft = table->maxlen / sizeof(unsigned long);
2736 if (proc_first_pos_non_zero_ignore(ppos, table))
2739 if (left > PAGE_SIZE - 1)
2740 left = PAGE_SIZE - 1;
2741 p = kbuf = memdup_user_nul(buffer, left);
2743 return PTR_ERR(kbuf);
2746 for (; left && vleft--; i++, first = 0) {
2752 proc_skip_spaces(&p, &left);
2756 err = proc_get_long(&p, &left, &val, &neg,
2758 sizeof(proc_wspace_sep), NULL);
2763 val = convmul * val / convdiv;
2764 if ((min && val < *min) || (max && val > *max)) {
2770 val = convdiv * (*i) / convmul;
2772 err = proc_put_char(&buffer, &left, '\t');
2776 err = proc_put_long(&buffer, &left, val, false);
2782 if (!write && !first && left && !err)
2783 err = proc_put_char(&buffer, &left, '\n');
2785 proc_skip_spaces(&p, &left);
2789 return err ? : -EINVAL;
2797 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2798 void __user *buffer,
2799 size_t *lenp, loff_t *ppos,
2800 unsigned long convmul,
2801 unsigned long convdiv)
2803 return __do_proc_doulongvec_minmax(table->data, table, write,
2804 buffer, lenp, ppos, convmul, convdiv);
2808 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2809 * @table: the sysctl table
2810 * @write: %TRUE if this is a write to the sysctl file
2811 * @buffer: the user buffer
2812 * @lenp: the size of the user buffer
2813 * @ppos: file position
2815 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2816 * values from/to the user buffer, treated as an ASCII string.
2818 * This routine will ensure the values are within the range specified by
2819 * table->extra1 (min) and table->extra2 (max).
2821 * Returns 0 on success.
2823 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2824 void __user *buffer, size_t *lenp, loff_t *ppos)
2826 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2830 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2831 * @table: the sysctl table
2832 * @write: %TRUE if this is a write to the sysctl file
2833 * @buffer: the user buffer
2834 * @lenp: the size of the user buffer
2835 * @ppos: file position
2837 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2838 * values from/to the user buffer, treated as an ASCII string. The values
2839 * are treated as milliseconds, and converted to jiffies when they are stored.
2841 * This routine will ensure the values are within the range specified by
2842 * table->extra1 (min) and table->extra2 (max).
2844 * Returns 0 on success.
2846 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2847 void __user *buffer,
2848 size_t *lenp, loff_t *ppos)
2850 return do_proc_doulongvec_minmax(table, write, buffer,
2851 lenp, ppos, HZ, 1000l);
2855 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2857 int write, void *data)
2860 if (*lvalp > INT_MAX / HZ)
2862 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2868 lval = -(unsigned long)val;
2871 lval = (unsigned long)val;
2878 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2880 int write, void *data)
2883 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2885 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2891 lval = -(unsigned long)val;
2894 lval = (unsigned long)val;
2896 *lvalp = jiffies_to_clock_t(lval);
2901 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2903 int write, void *data)
2906 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2916 lval = -(unsigned long)val;
2919 lval = (unsigned long)val;
2921 *lvalp = jiffies_to_msecs(lval);
2927 * proc_dointvec_jiffies - read a vector of integers as seconds
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 int) integer
2935 * values from/to the user buffer, treated as an ASCII string.
2936 * The values read are assumed to be in seconds, and are converted into
2939 * Returns 0 on success.
2941 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2942 void __user *buffer, size_t *lenp, loff_t *ppos)
2944 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2945 do_proc_dointvec_jiffies_conv,NULL);
2949 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
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: pointer to the file position
2956 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2957 * values from/to the user buffer, treated as an ASCII string.
2958 * The values read are assumed to be in 1/USER_HZ seconds, and
2959 * are converted into jiffies.
2961 * Returns 0 on success.
2963 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2964 void __user *buffer, size_t *lenp, loff_t *ppos)
2966 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2967 do_proc_dointvec_userhz_jiffies_conv,NULL);
2971 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2972 * @table: the sysctl table
2973 * @write: %TRUE if this is a write to the sysctl file
2974 * @buffer: the user buffer
2975 * @lenp: the size of the user buffer
2976 * @ppos: file position
2977 * @ppos: the current position in the file
2979 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2980 * values from/to the user buffer, treated as an ASCII string.
2981 * The values read are assumed to be in 1/1000 seconds, and
2982 * are converted into jiffies.
2984 * Returns 0 on success.
2986 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2987 void __user *buffer, size_t *lenp, loff_t *ppos)
2989 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2990 do_proc_dointvec_ms_jiffies_conv, NULL);
2993 static int proc_do_cad_pid(struct ctl_table *table, int write,
2994 void __user *buffer, size_t *lenp, loff_t *ppos)
2996 struct pid *new_pid;
3000 tmp = pid_vnr(cad_pid);
3002 r = __do_proc_dointvec(&tmp, table, write, buffer,
3003 lenp, ppos, NULL, NULL);
3007 new_pid = find_get_pid(tmp);
3011 put_pid(xchg(&cad_pid, new_pid));
3016 * proc_do_large_bitmap - read/write from/to a large bitmap
3017 * @table: the sysctl table
3018 * @write: %TRUE if this is a write to the sysctl file
3019 * @buffer: the user buffer
3020 * @lenp: the size of the user buffer
3021 * @ppos: file position
3023 * The bitmap is stored at table->data and the bitmap length (in bits)
3026 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3027 * large bitmaps may be represented in a compact manner. Writing into
3028 * the file will clear the bitmap then update it with the given input.
3030 * Returns 0 on success.
3032 int proc_do_large_bitmap(struct ctl_table *table, int write,
3033 void __user *buffer, size_t *lenp, loff_t *ppos)
3037 size_t left = *lenp;
3038 unsigned long bitmap_len = table->maxlen;
3039 unsigned long *bitmap = *(unsigned long **) table->data;
3040 unsigned long *tmp_bitmap = NULL;
3041 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3043 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3051 if (left > PAGE_SIZE - 1)
3052 left = PAGE_SIZE - 1;
3054 p = kbuf = memdup_user_nul(buffer, left);
3056 return PTR_ERR(kbuf);
3058 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3064 proc_skip_char(&p, &left, '\n');
3065 while (!err && left) {
3066 unsigned long val_a, val_b;
3069 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3073 if (val_a >= bitmap_len || neg) {
3085 err = proc_get_long(&p, &left, &val_b,
3086 &neg, tr_b, sizeof(tr_b),
3090 if (val_b >= bitmap_len || neg ||
3101 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3103 proc_skip_char(&p, &left, '\n');
3107 unsigned long bit_a, bit_b = 0;
3110 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3111 if (bit_a >= bitmap_len)
3113 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3117 err = proc_put_char(&buffer, &left, ',');
3121 err = proc_put_long(&buffer, &left, bit_a, false);
3124 if (bit_a != bit_b) {
3125 err = proc_put_char(&buffer, &left, '-');
3128 err = proc_put_long(&buffer, &left, bit_b, false);
3136 err = proc_put_char(&buffer, &left, '\n');
3142 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3144 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3156 #else /* CONFIG_PROC_SYSCTL */
3158 int proc_dostring(struct ctl_table *table, int write,
3159 void __user *buffer, size_t *lenp, loff_t *ppos)
3164 int proc_dointvec(struct ctl_table *table, int write,
3165 void __user *buffer, size_t *lenp, loff_t *ppos)
3170 int proc_douintvec(struct ctl_table *table, int write,
3171 void __user *buffer, size_t *lenp, loff_t *ppos)
3176 int proc_dointvec_minmax(struct ctl_table *table, int write,
3177 void __user *buffer, size_t *lenp, loff_t *ppos)
3182 int proc_douintvec_minmax(struct ctl_table *table, int write,
3183 void __user *buffer, size_t *lenp, loff_t *ppos)
3188 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3189 void __user *buffer, size_t *lenp, loff_t *ppos)
3194 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3195 void __user *buffer, size_t *lenp, loff_t *ppos)
3200 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3201 void __user *buffer, size_t *lenp, loff_t *ppos)
3206 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3207 void __user *buffer, size_t *lenp, loff_t *ppos)
3212 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3213 void __user *buffer,
3214 size_t *lenp, loff_t *ppos)
3220 #endif /* CONFIG_PROC_SYSCTL */
3223 * No sense putting this after each symbol definition, twice,
3224 * exception granted :-)
3226 EXPORT_SYMBOL(proc_dointvec);
3227 EXPORT_SYMBOL(proc_douintvec);
3228 EXPORT_SYMBOL(proc_dointvec_jiffies);
3229 EXPORT_SYMBOL(proc_dointvec_minmax);
3230 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3231 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3232 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3233 EXPORT_SYMBOL(proc_dostring);
3234 EXPORT_SYMBOL(proc_doulongvec_minmax);
3235 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);