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
93 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
94 #include <linux/stackleak.h>
96 #ifdef CONFIG_LOCKUP_DETECTOR
97 #include <linux/nmi.h>
100 #if defined(CONFIG_SYSCTL)
102 /* External variables not in a header file. */
103 extern int suid_dumpable;
104 #ifdef CONFIG_COREDUMP
105 extern int core_uses_pid;
106 extern char core_pattern[];
107 extern unsigned int core_pipe_limit;
110 extern int pid_max_min, pid_max_max;
111 extern int percpu_pagelist_fraction;
112 extern int latencytop_enabled;
113 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
115 extern int sysctl_nr_trim_pages;
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty = 60;
123 static int __maybe_unused neg_one = -1;
126 static int __maybe_unused one = 1;
127 static int __maybe_unused two = 2;
128 static int __maybe_unused four = 4;
129 static unsigned long one_ul = 1;
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;
150 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
151 * and hung_task_check_interval_secs
153 #ifdef CONFIG_DETECT_HUNG_TASK
154 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
157 #ifdef CONFIG_INOTIFY_USER
158 #include <linux/inotify.h>
164 extern int pwrsw_enabled;
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
168 extern int unaligned_enabled;
172 extern int unaligned_dump_stack;
175 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
176 extern int no_unaligned_warning;
179 #ifdef CONFIG_PROC_SYSCTL
182 * enum sysctl_writes_mode - supported sysctl write modes
184 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
185 * to be written, and multiple writes on the same sysctl file descriptor
186 * will rewrite the sysctl value, regardless of file position. No warning
187 * is issued when the initial position is not 0.
188 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
190 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
191 * file position 0 and the value must be fully contained in the buffer
192 * sent to the write syscall. If dealing with strings respect the file
193 * position, but restrict this to the max length of the buffer, anything
194 * passed the max lenght will be ignored. Multiple writes will append
197 * These write modes control how current file position affects the behavior of
198 * updating sysctl values through the proc interface on each write.
200 enum sysctl_writes_mode {
201 SYSCTL_WRITES_LEGACY = -1,
202 SYSCTL_WRITES_WARN = 0,
203 SYSCTL_WRITES_STRICT = 1,
206 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
208 static int proc_do_cad_pid(struct ctl_table *table, int write,
209 void __user *buffer, size_t *lenp, loff_t *ppos);
210 static int proc_taint(struct ctl_table *table, int write,
211 void __user *buffer, size_t *lenp, loff_t *ppos);
215 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
216 void __user *buffer, size_t *lenp, loff_t *ppos);
219 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos);
221 #ifdef CONFIG_COREDUMP
222 static int proc_dostring_coredump(struct ctl_table *table, int write,
223 void __user *buffer, size_t *lenp, loff_t *ppos);
225 static int proc_dopipe_max_size(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos);
228 #ifdef CONFIG_MAGIC_SYSRQ
229 /* Note: sysrq code uses its own private copy */
230 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
232 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
233 void __user *buffer, size_t *lenp,
238 error = proc_dointvec(table, write, buffer, lenp, ppos);
243 sysrq_toggle_support(__sysrq_enabled);
250 static struct ctl_table kern_table[];
251 static struct ctl_table vm_table[];
252 static struct ctl_table fs_table[];
253 static struct ctl_table debug_table[];
254 static struct ctl_table dev_table[];
255 extern struct ctl_table random_table[];
257 extern struct ctl_table epoll_table[];
260 #ifdef CONFIG_FW_LOADER_USER_HELPER
261 extern struct ctl_table firmware_config_table[];
264 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
265 int sysctl_legacy_va_layout;
268 /* The default sysctl tables: */
270 static struct ctl_table sysctl_base_table[] = {
272 .procname = "kernel",
289 .child = debug_table,
299 #ifdef CONFIG_SCHED_DEBUG
300 static int min_sched_granularity_ns = 100000; /* 100 usecs */
301 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
302 static int min_wakeup_granularity_ns; /* 0 usecs */
303 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
305 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
306 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
307 #endif /* CONFIG_SMP */
308 #endif /* CONFIG_SCHED_DEBUG */
310 #ifdef CONFIG_COMPACTION
311 static int min_extfrag_threshold;
312 static int max_extfrag_threshold = 1000;
315 static struct ctl_table kern_table[] = {
317 .procname = "sched_child_runs_first",
318 .data = &sysctl_sched_child_runs_first,
319 .maxlen = sizeof(unsigned int),
321 .proc_handler = proc_dointvec,
323 #ifdef CONFIG_SCHED_DEBUG
325 .procname = "sched_min_granularity_ns",
326 .data = &sysctl_sched_min_granularity,
327 .maxlen = sizeof(unsigned int),
329 .proc_handler = sched_proc_update_handler,
330 .extra1 = &min_sched_granularity_ns,
331 .extra2 = &max_sched_granularity_ns,
334 .procname = "sched_latency_ns",
335 .data = &sysctl_sched_latency,
336 .maxlen = sizeof(unsigned int),
338 .proc_handler = sched_proc_update_handler,
339 .extra1 = &min_sched_granularity_ns,
340 .extra2 = &max_sched_granularity_ns,
343 .procname = "sched_wakeup_granularity_ns",
344 .data = &sysctl_sched_wakeup_granularity,
345 .maxlen = sizeof(unsigned int),
347 .proc_handler = sched_proc_update_handler,
348 .extra1 = &min_wakeup_granularity_ns,
349 .extra2 = &max_wakeup_granularity_ns,
353 .procname = "sched_tunable_scaling",
354 .data = &sysctl_sched_tunable_scaling,
355 .maxlen = sizeof(enum sched_tunable_scaling),
357 .proc_handler = sched_proc_update_handler,
358 .extra1 = &min_sched_tunable_scaling,
359 .extra2 = &max_sched_tunable_scaling,
362 .procname = "sched_migration_cost_ns",
363 .data = &sysctl_sched_migration_cost,
364 .maxlen = sizeof(unsigned int),
366 .proc_handler = proc_dointvec,
369 .procname = "sched_nr_migrate",
370 .data = &sysctl_sched_nr_migrate,
371 .maxlen = sizeof(unsigned int),
373 .proc_handler = proc_dointvec,
375 #ifdef CONFIG_SCHEDSTATS
377 .procname = "sched_schedstats",
379 .maxlen = sizeof(unsigned int),
381 .proc_handler = sysctl_schedstats,
385 #endif /* CONFIG_SCHEDSTATS */
386 #endif /* CONFIG_SMP */
387 #ifdef CONFIG_NUMA_BALANCING
389 .procname = "numa_balancing_scan_delay_ms",
390 .data = &sysctl_numa_balancing_scan_delay,
391 .maxlen = sizeof(unsigned int),
393 .proc_handler = proc_dointvec,
396 .procname = "numa_balancing_scan_period_min_ms",
397 .data = &sysctl_numa_balancing_scan_period_min,
398 .maxlen = sizeof(unsigned int),
400 .proc_handler = proc_dointvec,
403 .procname = "numa_balancing_scan_period_max_ms",
404 .data = &sysctl_numa_balancing_scan_period_max,
405 .maxlen = sizeof(unsigned int),
407 .proc_handler = proc_dointvec,
410 .procname = "numa_balancing_scan_size_mb",
411 .data = &sysctl_numa_balancing_scan_size,
412 .maxlen = sizeof(unsigned int),
414 .proc_handler = proc_dointvec_minmax,
418 .procname = "numa_balancing",
419 .data = NULL, /* filled in by handler */
420 .maxlen = sizeof(unsigned int),
422 .proc_handler = sysctl_numa_balancing,
426 #endif /* CONFIG_NUMA_BALANCING */
427 #endif /* CONFIG_SCHED_DEBUG */
429 .procname = "sched_rt_period_us",
430 .data = &sysctl_sched_rt_period,
431 .maxlen = sizeof(unsigned int),
433 .proc_handler = sched_rt_handler,
436 .procname = "sched_rt_runtime_us",
437 .data = &sysctl_sched_rt_runtime,
438 .maxlen = sizeof(int),
440 .proc_handler = sched_rt_handler,
443 .procname = "sched_rr_timeslice_ms",
444 .data = &sysctl_sched_rr_timeslice,
445 .maxlen = sizeof(int),
447 .proc_handler = sched_rr_handler,
449 #ifdef CONFIG_SCHED_AUTOGROUP
451 .procname = "sched_autogroup_enabled",
452 .data = &sysctl_sched_autogroup_enabled,
453 .maxlen = sizeof(unsigned int),
455 .proc_handler = proc_dointvec_minmax,
460 #ifdef CONFIG_CFS_BANDWIDTH
462 .procname = "sched_cfs_bandwidth_slice_us",
463 .data = &sysctl_sched_cfs_bandwidth_slice,
464 .maxlen = sizeof(unsigned int),
466 .proc_handler = proc_dointvec_minmax,
470 #ifdef CONFIG_PROVE_LOCKING
472 .procname = "prove_locking",
473 .data = &prove_locking,
474 .maxlen = sizeof(int),
476 .proc_handler = proc_dointvec,
479 #ifdef CONFIG_LOCK_STAT
481 .procname = "lock_stat",
483 .maxlen = sizeof(int),
485 .proc_handler = proc_dointvec,
490 .data = &panic_timeout,
491 .maxlen = sizeof(int),
493 .proc_handler = proc_dointvec,
495 #ifdef CONFIG_COREDUMP
497 .procname = "core_uses_pid",
498 .data = &core_uses_pid,
499 .maxlen = sizeof(int),
501 .proc_handler = proc_dointvec,
504 .procname = "core_pattern",
505 .data = core_pattern,
506 .maxlen = CORENAME_MAX_SIZE,
508 .proc_handler = proc_dostring_coredump,
511 .procname = "core_pipe_limit",
512 .data = &core_pipe_limit,
513 .maxlen = sizeof(unsigned int),
515 .proc_handler = proc_dointvec,
518 #ifdef CONFIG_PROC_SYSCTL
520 .procname = "tainted",
521 .maxlen = sizeof(long),
523 .proc_handler = proc_taint,
526 .procname = "sysctl_writes_strict",
527 .data = &sysctl_writes_strict,
528 .maxlen = sizeof(int),
530 .proc_handler = proc_dointvec_minmax,
535 #ifdef CONFIG_LATENCYTOP
537 .procname = "latencytop",
538 .data = &latencytop_enabled,
539 .maxlen = sizeof(int),
541 .proc_handler = sysctl_latencytop,
544 #ifdef CONFIG_BLK_DEV_INITRD
546 .procname = "real-root-dev",
547 .data = &real_root_dev,
548 .maxlen = sizeof(int),
550 .proc_handler = proc_dointvec,
554 .procname = "print-fatal-signals",
555 .data = &print_fatal_signals,
556 .maxlen = sizeof(int),
558 .proc_handler = proc_dointvec,
562 .procname = "reboot-cmd",
563 .data = reboot_command,
566 .proc_handler = proc_dostring,
569 .procname = "stop-a",
570 .data = &stop_a_enabled,
571 .maxlen = sizeof (int),
573 .proc_handler = proc_dointvec,
576 .procname = "scons-poweroff",
577 .data = &scons_pwroff,
578 .maxlen = sizeof (int),
580 .proc_handler = proc_dointvec,
583 #ifdef CONFIG_SPARC64
585 .procname = "tsb-ratio",
586 .data = &sysctl_tsb_ratio,
587 .maxlen = sizeof (int),
589 .proc_handler = proc_dointvec,
594 .procname = "soft-power",
595 .data = &pwrsw_enabled,
596 .maxlen = sizeof (int),
598 .proc_handler = proc_dointvec,
601 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
603 .procname = "unaligned-trap",
604 .data = &unaligned_enabled,
605 .maxlen = sizeof (int),
607 .proc_handler = proc_dointvec,
611 .procname = "ctrl-alt-del",
613 .maxlen = sizeof(int),
615 .proc_handler = proc_dointvec,
617 #ifdef CONFIG_FUNCTION_TRACER
619 .procname = "ftrace_enabled",
620 .data = &ftrace_enabled,
621 .maxlen = sizeof(int),
623 .proc_handler = ftrace_enable_sysctl,
626 #ifdef CONFIG_STACK_TRACER
628 .procname = "stack_tracer_enabled",
629 .data = &stack_tracer_enabled,
630 .maxlen = sizeof(int),
632 .proc_handler = stack_trace_sysctl,
635 #ifdef CONFIG_TRACING
637 .procname = "ftrace_dump_on_oops",
638 .data = &ftrace_dump_on_oops,
639 .maxlen = sizeof(int),
641 .proc_handler = proc_dointvec,
644 .procname = "traceoff_on_warning",
645 .data = &__disable_trace_on_warning,
646 .maxlen = sizeof(__disable_trace_on_warning),
648 .proc_handler = proc_dointvec,
651 .procname = "tracepoint_printk",
652 .data = &tracepoint_printk,
653 .maxlen = sizeof(tracepoint_printk),
655 .proc_handler = tracepoint_printk_sysctl,
658 #ifdef CONFIG_KEXEC_CORE
660 .procname = "kexec_load_disabled",
661 .data = &kexec_load_disabled,
662 .maxlen = sizeof(int),
664 /* only handle a transition from default "0" to "1" */
665 .proc_handler = proc_dointvec_minmax,
670 #ifdef CONFIG_MODULES
672 .procname = "modprobe",
673 .data = &modprobe_path,
674 .maxlen = KMOD_PATH_LEN,
676 .proc_handler = proc_dostring,
679 .procname = "modules_disabled",
680 .data = &modules_disabled,
681 .maxlen = sizeof(int),
683 /* only handle a transition from default "0" to "1" */
684 .proc_handler = proc_dointvec_minmax,
689 #ifdef CONFIG_UEVENT_HELPER
691 .procname = "hotplug",
692 .data = &uevent_helper,
693 .maxlen = UEVENT_HELPER_PATH_LEN,
695 .proc_handler = proc_dostring,
698 #ifdef CONFIG_CHR_DEV_SG
700 .procname = "sg-big-buff",
701 .data = &sg_big_buff,
702 .maxlen = sizeof (int),
704 .proc_handler = proc_dointvec,
707 #ifdef CONFIG_BSD_PROCESS_ACCT
711 .maxlen = 3*sizeof(int),
713 .proc_handler = proc_dointvec,
716 #ifdef CONFIG_MAGIC_SYSRQ
719 .data = &__sysrq_enabled,
720 .maxlen = sizeof (int),
722 .proc_handler = sysrq_sysctl_handler,
725 #ifdef CONFIG_PROC_SYSCTL
727 .procname = "cad_pid",
729 .maxlen = sizeof (int),
731 .proc_handler = proc_do_cad_pid,
735 .procname = "threads-max",
737 .maxlen = sizeof(int),
739 .proc_handler = sysctl_max_threads,
742 .procname = "random",
744 .child = random_table,
747 .procname = "usermodehelper",
749 .child = usermodehelper_table,
751 #ifdef CONFIG_FW_LOADER_USER_HELPER
753 .procname = "firmware_config",
755 .child = firmware_config_table,
759 .procname = "overflowuid",
760 .data = &overflowuid,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &minolduid,
765 .extra2 = &maxolduid,
768 .procname = "overflowgid",
769 .data = &overflowgid,
770 .maxlen = sizeof(int),
772 .proc_handler = proc_dointvec_minmax,
773 .extra1 = &minolduid,
774 .extra2 = &maxolduid,
777 #ifdef CONFIG_MATHEMU
779 .procname = "ieee_emulation_warnings",
780 .data = &sysctl_ieee_emulation_warnings,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_dointvec,
787 .procname = "userprocess_debug",
788 .data = &show_unhandled_signals,
789 .maxlen = sizeof(int),
791 .proc_handler = proc_dointvec,
795 .procname = "pid_max",
797 .maxlen = sizeof (int),
799 .proc_handler = proc_dointvec_minmax,
800 .extra1 = &pid_max_min,
801 .extra2 = &pid_max_max,
804 .procname = "panic_on_oops",
805 .data = &panic_on_oops,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec,
810 #if defined CONFIG_PRINTK
812 .procname = "printk",
813 .data = &console_loglevel,
814 .maxlen = 4*sizeof(int),
816 .proc_handler = proc_dointvec,
819 .procname = "printk_ratelimit",
820 .data = &printk_ratelimit_state.interval,
821 .maxlen = sizeof(int),
823 .proc_handler = proc_dointvec_jiffies,
826 .procname = "printk_ratelimit_burst",
827 .data = &printk_ratelimit_state.burst,
828 .maxlen = sizeof(int),
830 .proc_handler = proc_dointvec,
833 .procname = "printk_delay",
834 .data = &printk_delay_msec,
835 .maxlen = sizeof(int),
837 .proc_handler = proc_dointvec_minmax,
839 .extra2 = &ten_thousand,
842 .procname = "printk_devkmsg",
843 .data = devkmsg_log_str,
844 .maxlen = DEVKMSG_STR_MAX_SIZE,
846 .proc_handler = devkmsg_sysctl_set_loglvl,
849 .procname = "dmesg_restrict",
850 .data = &dmesg_restrict,
851 .maxlen = sizeof(int),
853 .proc_handler = proc_dointvec_minmax_sysadmin,
858 .procname = "kptr_restrict",
859 .data = &kptr_restrict,
860 .maxlen = sizeof(int),
862 .proc_handler = proc_dointvec_minmax_sysadmin,
868 .procname = "ngroups_max",
869 .data = &ngroups_max,
870 .maxlen = sizeof (int),
872 .proc_handler = proc_dointvec,
875 .procname = "cap_last_cap",
876 .data = (void *)&cap_last_cap,
877 .maxlen = sizeof(int),
879 .proc_handler = proc_dointvec,
881 #if defined(CONFIG_LOCKUP_DETECTOR)
883 .procname = "watchdog",
884 .data = &watchdog_user_enabled,
885 .maxlen = sizeof(int),
887 .proc_handler = proc_watchdog,
892 .procname = "watchdog_thresh",
893 .data = &watchdog_thresh,
894 .maxlen = sizeof(int),
896 .proc_handler = proc_watchdog_thresh,
901 .procname = "nmi_watchdog",
902 .data = &nmi_watchdog_user_enabled,
903 .maxlen = sizeof(int),
904 .mode = NMI_WATCHDOG_SYSCTL_PERM,
905 .proc_handler = proc_nmi_watchdog,
910 .procname = "watchdog_cpumask",
911 .data = &watchdog_cpumask_bits,
914 .proc_handler = proc_watchdog_cpumask,
916 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
918 .procname = "soft_watchdog",
919 .data = &soft_watchdog_user_enabled,
920 .maxlen = sizeof(int),
922 .proc_handler = proc_soft_watchdog,
927 .procname = "softlockup_panic",
928 .data = &softlockup_panic,
929 .maxlen = sizeof(int),
931 .proc_handler = proc_dointvec_minmax,
937 .procname = "softlockup_all_cpu_backtrace",
938 .data = &sysctl_softlockup_all_cpu_backtrace,
939 .maxlen = sizeof(int),
941 .proc_handler = proc_dointvec_minmax,
945 #endif /* CONFIG_SMP */
947 #ifdef CONFIG_HARDLOCKUP_DETECTOR
949 .procname = "hardlockup_panic",
950 .data = &hardlockup_panic,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec_minmax,
959 .procname = "hardlockup_all_cpu_backtrace",
960 .data = &sysctl_hardlockup_all_cpu_backtrace,
961 .maxlen = sizeof(int),
963 .proc_handler = proc_dointvec_minmax,
967 #endif /* CONFIG_SMP */
971 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
973 .procname = "unknown_nmi_panic",
974 .data = &unknown_nmi_panic,
975 .maxlen = sizeof (int),
977 .proc_handler = proc_dointvec,
980 #if defined(CONFIG_X86)
982 .procname = "panic_on_unrecovered_nmi",
983 .data = &panic_on_unrecovered_nmi,
984 .maxlen = sizeof(int),
986 .proc_handler = proc_dointvec,
989 .procname = "panic_on_io_nmi",
990 .data = &panic_on_io_nmi,
991 .maxlen = sizeof(int),
993 .proc_handler = proc_dointvec,
995 #ifdef CONFIG_DEBUG_STACKOVERFLOW
997 .procname = "panic_on_stackoverflow",
998 .data = &sysctl_panic_on_stackoverflow,
999 .maxlen = sizeof(int),
1001 .proc_handler = proc_dointvec,
1005 .procname = "bootloader_type",
1006 .data = &bootloader_type,
1007 .maxlen = sizeof (int),
1009 .proc_handler = proc_dointvec,
1012 .procname = "bootloader_version",
1013 .data = &bootloader_version,
1014 .maxlen = sizeof (int),
1016 .proc_handler = proc_dointvec,
1019 .procname = "io_delay_type",
1020 .data = &io_delay_type,
1021 .maxlen = sizeof(int),
1023 .proc_handler = proc_dointvec,
1026 #if defined(CONFIG_MMU)
1028 .procname = "randomize_va_space",
1029 .data = &randomize_va_space,
1030 .maxlen = sizeof(int),
1032 .proc_handler = proc_dointvec,
1035 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1037 .procname = "spin_retry",
1038 .data = &spin_retry,
1039 .maxlen = sizeof (int),
1041 .proc_handler = proc_dointvec,
1044 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1046 .procname = "acpi_video_flags",
1047 .data = &acpi_realmode_flags,
1048 .maxlen = sizeof (unsigned long),
1050 .proc_handler = proc_doulongvec_minmax,
1053 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1055 .procname = "ignore-unaligned-usertrap",
1056 .data = &no_unaligned_warning,
1057 .maxlen = sizeof (int),
1059 .proc_handler = proc_dointvec,
1064 .procname = "unaligned-dump-stack",
1065 .data = &unaligned_dump_stack,
1066 .maxlen = sizeof (int),
1068 .proc_handler = proc_dointvec,
1071 #ifdef CONFIG_DETECT_HUNG_TASK
1073 .procname = "hung_task_panic",
1074 .data = &sysctl_hung_task_panic,
1075 .maxlen = sizeof(int),
1077 .proc_handler = proc_dointvec_minmax,
1082 .procname = "hung_task_check_count",
1083 .data = &sysctl_hung_task_check_count,
1084 .maxlen = sizeof(int),
1086 .proc_handler = proc_dointvec_minmax,
1090 .procname = "hung_task_timeout_secs",
1091 .data = &sysctl_hung_task_timeout_secs,
1092 .maxlen = sizeof(unsigned long),
1094 .proc_handler = proc_dohung_task_timeout_secs,
1095 .extra2 = &hung_task_timeout_max,
1098 .procname = "hung_task_check_interval_secs",
1099 .data = &sysctl_hung_task_check_interval_secs,
1100 .maxlen = sizeof(unsigned long),
1102 .proc_handler = proc_dohung_task_timeout_secs,
1103 .extra2 = &hung_task_timeout_max,
1106 .procname = "hung_task_warnings",
1107 .data = &sysctl_hung_task_warnings,
1108 .maxlen = sizeof(int),
1110 .proc_handler = proc_dointvec_minmax,
1114 #ifdef CONFIG_RT_MUTEXES
1116 .procname = "max_lock_depth",
1117 .data = &max_lock_depth,
1118 .maxlen = sizeof(int),
1120 .proc_handler = proc_dointvec,
1124 .procname = "poweroff_cmd",
1125 .data = &poweroff_cmd,
1126 .maxlen = POWEROFF_CMD_PATH_LEN,
1128 .proc_handler = proc_dostring,
1134 .child = key_sysctls,
1137 #ifdef CONFIG_PERF_EVENTS
1139 * User-space scripts rely on the existence of this file
1140 * as a feature check for perf_events being enabled.
1142 * So it's an ABI, do not remove!
1145 .procname = "perf_event_paranoid",
1146 .data = &sysctl_perf_event_paranoid,
1147 .maxlen = sizeof(sysctl_perf_event_paranoid),
1149 .proc_handler = proc_dointvec,
1152 .procname = "perf_event_mlock_kb",
1153 .data = &sysctl_perf_event_mlock,
1154 .maxlen = sizeof(sysctl_perf_event_mlock),
1156 .proc_handler = proc_dointvec,
1159 .procname = "perf_event_max_sample_rate",
1160 .data = &sysctl_perf_event_sample_rate,
1161 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1163 .proc_handler = perf_proc_update_handler,
1167 .procname = "perf_cpu_time_max_percent",
1168 .data = &sysctl_perf_cpu_time_max_percent,
1169 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1171 .proc_handler = perf_cpu_time_max_percent_handler,
1173 .extra2 = &one_hundred,
1176 .procname = "perf_event_max_stack",
1177 .data = &sysctl_perf_event_max_stack,
1178 .maxlen = sizeof(sysctl_perf_event_max_stack),
1180 .proc_handler = perf_event_max_stack_handler,
1182 .extra2 = &six_hundred_forty_kb,
1185 .procname = "perf_event_max_contexts_per_stack",
1186 .data = &sysctl_perf_event_max_contexts_per_stack,
1187 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1189 .proc_handler = perf_event_max_stack_handler,
1191 .extra2 = &one_thousand,
1195 .procname = "panic_on_warn",
1196 .data = &panic_on_warn,
1197 .maxlen = sizeof(int),
1199 .proc_handler = proc_dointvec_minmax,
1203 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1205 .procname = "timer_migration",
1206 .data = &sysctl_timer_migration,
1207 .maxlen = sizeof(unsigned int),
1209 .proc_handler = timer_migration_handler,
1214 #ifdef CONFIG_BPF_SYSCALL
1216 .procname = "unprivileged_bpf_disabled",
1217 .data = &sysctl_unprivileged_bpf_disabled,
1218 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1220 /* only handle a transition from default "0" to "1" */
1221 .proc_handler = proc_dointvec_minmax,
1226 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1228 .procname = "panic_on_rcu_stall",
1229 .data = &sysctl_panic_on_rcu_stall,
1230 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1232 .proc_handler = proc_dointvec_minmax,
1237 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1239 .procname = "stack_erasing",
1241 .maxlen = sizeof(int),
1243 .proc_handler = stack_erasing_sysctl,
1251 static struct ctl_table vm_table[] = {
1253 .procname = "overcommit_memory",
1254 .data = &sysctl_overcommit_memory,
1255 .maxlen = sizeof(sysctl_overcommit_memory),
1257 .proc_handler = proc_dointvec_minmax,
1262 .procname = "panic_on_oom",
1263 .data = &sysctl_panic_on_oom,
1264 .maxlen = sizeof(sysctl_panic_on_oom),
1266 .proc_handler = proc_dointvec_minmax,
1271 .procname = "oom_kill_allocating_task",
1272 .data = &sysctl_oom_kill_allocating_task,
1273 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1275 .proc_handler = proc_dointvec,
1278 .procname = "oom_dump_tasks",
1279 .data = &sysctl_oom_dump_tasks,
1280 .maxlen = sizeof(sysctl_oom_dump_tasks),
1282 .proc_handler = proc_dointvec,
1285 .procname = "overcommit_ratio",
1286 .data = &sysctl_overcommit_ratio,
1287 .maxlen = sizeof(sysctl_overcommit_ratio),
1289 .proc_handler = overcommit_ratio_handler,
1292 .procname = "overcommit_kbytes",
1293 .data = &sysctl_overcommit_kbytes,
1294 .maxlen = sizeof(sysctl_overcommit_kbytes),
1296 .proc_handler = overcommit_kbytes_handler,
1299 .procname = "page-cluster",
1300 .data = &page_cluster,
1301 .maxlen = sizeof(int),
1303 .proc_handler = proc_dointvec_minmax,
1307 .procname = "dirty_background_ratio",
1308 .data = &dirty_background_ratio,
1309 .maxlen = sizeof(dirty_background_ratio),
1311 .proc_handler = dirty_background_ratio_handler,
1313 .extra2 = &one_hundred,
1316 .procname = "dirty_background_bytes",
1317 .data = &dirty_background_bytes,
1318 .maxlen = sizeof(dirty_background_bytes),
1320 .proc_handler = dirty_background_bytes_handler,
1324 .procname = "dirty_ratio",
1325 .data = &vm_dirty_ratio,
1326 .maxlen = sizeof(vm_dirty_ratio),
1328 .proc_handler = dirty_ratio_handler,
1330 .extra2 = &one_hundred,
1333 .procname = "dirty_bytes",
1334 .data = &vm_dirty_bytes,
1335 .maxlen = sizeof(vm_dirty_bytes),
1337 .proc_handler = dirty_bytes_handler,
1338 .extra1 = &dirty_bytes_min,
1341 .procname = "dirty_writeback_centisecs",
1342 .data = &dirty_writeback_interval,
1343 .maxlen = sizeof(dirty_writeback_interval),
1345 .proc_handler = dirty_writeback_centisecs_handler,
1348 .procname = "dirty_expire_centisecs",
1349 .data = &dirty_expire_interval,
1350 .maxlen = sizeof(dirty_expire_interval),
1352 .proc_handler = proc_dointvec_minmax,
1356 .procname = "dirtytime_expire_seconds",
1357 .data = &dirtytime_expire_interval,
1358 .maxlen = sizeof(dirtytime_expire_interval),
1360 .proc_handler = dirtytime_interval_handler,
1364 .procname = "swappiness",
1365 .data = &vm_swappiness,
1366 .maxlen = sizeof(vm_swappiness),
1368 .proc_handler = proc_dointvec_minmax,
1370 .extra2 = &one_hundred,
1372 #ifdef CONFIG_HUGETLB_PAGE
1374 .procname = "nr_hugepages",
1376 .maxlen = sizeof(unsigned long),
1378 .proc_handler = hugetlb_sysctl_handler,
1382 .procname = "nr_hugepages_mempolicy",
1384 .maxlen = sizeof(unsigned long),
1386 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1389 .procname = "numa_stat",
1390 .data = &sysctl_vm_numa_stat,
1391 .maxlen = sizeof(int),
1393 .proc_handler = sysctl_vm_numa_stat_handler,
1399 .procname = "hugetlb_shm_group",
1400 .data = &sysctl_hugetlb_shm_group,
1401 .maxlen = sizeof(gid_t),
1403 .proc_handler = proc_dointvec,
1406 .procname = "nr_overcommit_hugepages",
1408 .maxlen = sizeof(unsigned long),
1410 .proc_handler = hugetlb_overcommit_handler,
1414 .procname = "lowmem_reserve_ratio",
1415 .data = &sysctl_lowmem_reserve_ratio,
1416 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1418 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1421 .procname = "drop_caches",
1422 .data = &sysctl_drop_caches,
1423 .maxlen = sizeof(int),
1425 .proc_handler = drop_caches_sysctl_handler,
1429 #ifdef CONFIG_COMPACTION
1431 .procname = "compact_memory",
1432 .data = &sysctl_compact_memory,
1433 .maxlen = sizeof(int),
1435 .proc_handler = sysctl_compaction_handler,
1438 .procname = "extfrag_threshold",
1439 .data = &sysctl_extfrag_threshold,
1440 .maxlen = sizeof(int),
1442 .proc_handler = sysctl_extfrag_handler,
1443 .extra1 = &min_extfrag_threshold,
1444 .extra2 = &max_extfrag_threshold,
1447 .procname = "compact_unevictable_allowed",
1448 .data = &sysctl_compact_unevictable_allowed,
1449 .maxlen = sizeof(int),
1451 .proc_handler = proc_dointvec,
1456 #endif /* CONFIG_COMPACTION */
1458 .procname = "min_free_kbytes",
1459 .data = &min_free_kbytes,
1460 .maxlen = sizeof(min_free_kbytes),
1462 .proc_handler = min_free_kbytes_sysctl_handler,
1466 .procname = "watermark_boost_factor",
1467 .data = &watermark_boost_factor,
1468 .maxlen = sizeof(watermark_boost_factor),
1470 .proc_handler = watermark_boost_factor_sysctl_handler,
1474 .procname = "watermark_scale_factor",
1475 .data = &watermark_scale_factor,
1476 .maxlen = sizeof(watermark_scale_factor),
1478 .proc_handler = watermark_scale_factor_sysctl_handler,
1480 .extra2 = &one_thousand,
1483 .procname = "percpu_pagelist_fraction",
1484 .data = &percpu_pagelist_fraction,
1485 .maxlen = sizeof(percpu_pagelist_fraction),
1487 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1492 .procname = "max_map_count",
1493 .data = &sysctl_max_map_count,
1494 .maxlen = sizeof(sysctl_max_map_count),
1496 .proc_handler = proc_dointvec_minmax,
1501 .procname = "nr_trim_pages",
1502 .data = &sysctl_nr_trim_pages,
1503 .maxlen = sizeof(sysctl_nr_trim_pages),
1505 .proc_handler = proc_dointvec_minmax,
1510 .procname = "laptop_mode",
1511 .data = &laptop_mode,
1512 .maxlen = sizeof(laptop_mode),
1514 .proc_handler = proc_dointvec_jiffies,
1517 .procname = "block_dump",
1518 .data = &block_dump,
1519 .maxlen = sizeof(block_dump),
1521 .proc_handler = proc_dointvec,
1525 .procname = "vfs_cache_pressure",
1526 .data = &sysctl_vfs_cache_pressure,
1527 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1529 .proc_handler = proc_dointvec,
1532 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1534 .procname = "legacy_va_layout",
1535 .data = &sysctl_legacy_va_layout,
1536 .maxlen = sizeof(sysctl_legacy_va_layout),
1538 .proc_handler = proc_dointvec,
1544 .procname = "zone_reclaim_mode",
1545 .data = &node_reclaim_mode,
1546 .maxlen = sizeof(node_reclaim_mode),
1548 .proc_handler = proc_dointvec,
1552 .procname = "min_unmapped_ratio",
1553 .data = &sysctl_min_unmapped_ratio,
1554 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1556 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1558 .extra2 = &one_hundred,
1561 .procname = "min_slab_ratio",
1562 .data = &sysctl_min_slab_ratio,
1563 .maxlen = sizeof(sysctl_min_slab_ratio),
1565 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1567 .extra2 = &one_hundred,
1572 .procname = "stat_interval",
1573 .data = &sysctl_stat_interval,
1574 .maxlen = sizeof(sysctl_stat_interval),
1576 .proc_handler = proc_dointvec_jiffies,
1579 .procname = "stat_refresh",
1583 .proc_handler = vmstat_refresh,
1588 .procname = "mmap_min_addr",
1589 .data = &dac_mmap_min_addr,
1590 .maxlen = sizeof(unsigned long),
1592 .proc_handler = mmap_min_addr_handler,
1597 .procname = "numa_zonelist_order",
1598 .data = &numa_zonelist_order,
1599 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1601 .proc_handler = numa_zonelist_order_handler,
1604 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1605 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1607 .procname = "vdso_enabled",
1608 #ifdef CONFIG_X86_32
1609 .data = &vdso32_enabled,
1610 .maxlen = sizeof(vdso32_enabled),
1612 .data = &vdso_enabled,
1613 .maxlen = sizeof(vdso_enabled),
1616 .proc_handler = proc_dointvec,
1620 #ifdef CONFIG_HIGHMEM
1622 .procname = "highmem_is_dirtyable",
1623 .data = &vm_highmem_is_dirtyable,
1624 .maxlen = sizeof(vm_highmem_is_dirtyable),
1626 .proc_handler = proc_dointvec_minmax,
1631 #ifdef CONFIG_MEMORY_FAILURE
1633 .procname = "memory_failure_early_kill",
1634 .data = &sysctl_memory_failure_early_kill,
1635 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1637 .proc_handler = proc_dointvec_minmax,
1642 .procname = "memory_failure_recovery",
1643 .data = &sysctl_memory_failure_recovery,
1644 .maxlen = sizeof(sysctl_memory_failure_recovery),
1646 .proc_handler = proc_dointvec_minmax,
1652 .procname = "user_reserve_kbytes",
1653 .data = &sysctl_user_reserve_kbytes,
1654 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1656 .proc_handler = proc_doulongvec_minmax,
1659 .procname = "admin_reserve_kbytes",
1660 .data = &sysctl_admin_reserve_kbytes,
1661 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1663 .proc_handler = proc_doulongvec_minmax,
1665 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1667 .procname = "mmap_rnd_bits",
1668 .data = &mmap_rnd_bits,
1669 .maxlen = sizeof(mmap_rnd_bits),
1671 .proc_handler = proc_dointvec_minmax,
1672 .extra1 = (void *)&mmap_rnd_bits_min,
1673 .extra2 = (void *)&mmap_rnd_bits_max,
1676 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1678 .procname = "mmap_rnd_compat_bits",
1679 .data = &mmap_rnd_compat_bits,
1680 .maxlen = sizeof(mmap_rnd_compat_bits),
1682 .proc_handler = proc_dointvec_minmax,
1683 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1684 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1690 static struct ctl_table fs_table[] = {
1692 .procname = "inode-nr",
1693 .data = &inodes_stat,
1694 .maxlen = 2*sizeof(long),
1696 .proc_handler = proc_nr_inodes,
1699 .procname = "inode-state",
1700 .data = &inodes_stat,
1701 .maxlen = 7*sizeof(long),
1703 .proc_handler = proc_nr_inodes,
1706 .procname = "file-nr",
1707 .data = &files_stat,
1708 .maxlen = sizeof(files_stat),
1710 .proc_handler = proc_nr_files,
1713 .procname = "file-max",
1714 .data = &files_stat.max_files,
1715 .maxlen = sizeof(files_stat.max_files),
1717 .proc_handler = proc_doulongvec_minmax,
1720 .procname = "nr_open",
1721 .data = &sysctl_nr_open,
1722 .maxlen = sizeof(unsigned int),
1724 .proc_handler = proc_dointvec_minmax,
1725 .extra1 = &sysctl_nr_open_min,
1726 .extra2 = &sysctl_nr_open_max,
1729 .procname = "dentry-state",
1730 .data = &dentry_stat,
1731 .maxlen = 6*sizeof(long),
1733 .proc_handler = proc_nr_dentry,
1736 .procname = "overflowuid",
1737 .data = &fs_overflowuid,
1738 .maxlen = sizeof(int),
1740 .proc_handler = proc_dointvec_minmax,
1741 .extra1 = &minolduid,
1742 .extra2 = &maxolduid,
1745 .procname = "overflowgid",
1746 .data = &fs_overflowgid,
1747 .maxlen = sizeof(int),
1749 .proc_handler = proc_dointvec_minmax,
1750 .extra1 = &minolduid,
1751 .extra2 = &maxolduid,
1753 #ifdef CONFIG_FILE_LOCKING
1755 .procname = "leases-enable",
1756 .data = &leases_enable,
1757 .maxlen = sizeof(int),
1759 .proc_handler = proc_dointvec,
1762 #ifdef CONFIG_DNOTIFY
1764 .procname = "dir-notify-enable",
1765 .data = &dir_notify_enable,
1766 .maxlen = sizeof(int),
1768 .proc_handler = proc_dointvec,
1772 #ifdef CONFIG_FILE_LOCKING
1774 .procname = "lease-break-time",
1775 .data = &lease_break_time,
1776 .maxlen = sizeof(int),
1778 .proc_handler = proc_dointvec,
1783 .procname = "aio-nr",
1785 .maxlen = sizeof(aio_nr),
1787 .proc_handler = proc_doulongvec_minmax,
1790 .procname = "aio-max-nr",
1791 .data = &aio_max_nr,
1792 .maxlen = sizeof(aio_max_nr),
1794 .proc_handler = proc_doulongvec_minmax,
1796 #endif /* CONFIG_AIO */
1797 #ifdef CONFIG_INOTIFY_USER
1799 .procname = "inotify",
1801 .child = inotify_table,
1806 .procname = "epoll",
1808 .child = epoll_table,
1813 .procname = "protected_symlinks",
1814 .data = &sysctl_protected_symlinks,
1815 .maxlen = sizeof(int),
1817 .proc_handler = proc_dointvec_minmax,
1822 .procname = "protected_hardlinks",
1823 .data = &sysctl_protected_hardlinks,
1824 .maxlen = sizeof(int),
1826 .proc_handler = proc_dointvec_minmax,
1831 .procname = "protected_fifos",
1832 .data = &sysctl_protected_fifos,
1833 .maxlen = sizeof(int),
1835 .proc_handler = proc_dointvec_minmax,
1840 .procname = "protected_regular",
1841 .data = &sysctl_protected_regular,
1842 .maxlen = sizeof(int),
1844 .proc_handler = proc_dointvec_minmax,
1849 .procname = "suid_dumpable",
1850 .data = &suid_dumpable,
1851 .maxlen = sizeof(int),
1853 .proc_handler = proc_dointvec_minmax_coredump,
1857 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1859 .procname = "binfmt_misc",
1861 .child = sysctl_mount_point,
1865 .procname = "pipe-max-size",
1866 .data = &pipe_max_size,
1867 .maxlen = sizeof(pipe_max_size),
1869 .proc_handler = proc_dopipe_max_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 first 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 * handlers 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 size_t proc_skip_spaces(char **buf)
2072 char *tmp = skip_spaces(*buf);
2078 static void proc_skip_char(char **buf, size_t *size, const char v)
2088 #define TMPBUFLEN 22
2090 * proc_get_long - reads an ASCII formatted integer from a user buffer
2092 * @buf: a kernel buffer
2093 * @size: size of the kernel buffer
2094 * @val: this is where the number will be stored
2095 * @neg: set to %TRUE if number is negative
2096 * @perm_tr: a vector which contains the allowed trailers
2097 * @perm_tr_len: size of the perm_tr vector
2098 * @tr: pointer to store the trailer character
2100 * In case of success %0 is returned and @buf and @size are updated with
2101 * the amount of bytes read. If @tr is non-NULL and a trailing
2102 * character exists (size is non-zero after returning from this
2103 * function), @tr is updated with the trailing character.
2105 static int proc_get_long(char **buf, size_t *size,
2106 unsigned long *val, bool *neg,
2107 const char *perm_tr, unsigned perm_tr_len, char *tr)
2110 char *p, tmp[TMPBUFLEN];
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 left -= proc_skip_spaces(&p);
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 left -= proc_skip_spaces(&p);
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 left -= proc_skip_spaces(&p);
2363 err = proc_get_long(&p, &left, &lval, &neg,
2365 sizeof(proc_wspace_sep), NULL);
2371 if (conv(&lval, tbl_data, 1, data)) {
2377 left -= proc_skip_spaces(&p);
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);
2556 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2557 * @min: pointer to minimum allowable value
2558 * @max: pointer to maximum allowable value
2560 * The do_proc_dointvec_minmax_conv_param structure provides the
2561 * minimum and maximum values for doing range checking for those sysctl
2562 * parameters that use the proc_dointvec_minmax() handler.
2564 struct do_proc_dointvec_minmax_conv_param {
2569 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2571 int write, void *data)
2573 struct do_proc_dointvec_minmax_conv_param *param = data;
2575 int val = *negp ? -*lvalp : *lvalp;
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 or -EINVAL on write when the range check fails.
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);
2621 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2622 * @min: pointer to minimum allowable value
2623 * @max: pointer to maximum allowable value
2625 * The do_proc_douintvec_minmax_conv_param structure provides the
2626 * minimum and maximum values for doing range checking for those sysctl
2627 * parameters that use the proc_douintvec_minmax() handler.
2629 struct do_proc_douintvec_minmax_conv_param {
2634 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2636 int write, void *data)
2638 struct do_proc_douintvec_minmax_conv_param *param = data;
2641 unsigned int val = *lvalp;
2643 if (*lvalp > UINT_MAX)
2646 if ((param->min && *param->min > val) ||
2647 (param->max && *param->max < val))
2652 unsigned int val = *valp;
2653 *lvalp = (unsigned long) val;
2660 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2661 * @table: the sysctl table
2662 * @write: %TRUE if this is a write to the sysctl file
2663 * @buffer: the user buffer
2664 * @lenp: the size of the user buffer
2665 * @ppos: file position
2667 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2668 * values from/to the user buffer, treated as an ASCII string. Negative
2669 * strings are not allowed.
2671 * This routine will ensure the values are within the range specified by
2672 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2673 * check for UINT_MAX to avoid having to support wrap around uses from
2676 * Returns 0 on success or -ERANGE on write when the range check fails.
2678 int proc_douintvec_minmax(struct ctl_table *table, int write,
2679 void __user *buffer, size_t *lenp, loff_t *ppos)
2681 struct do_proc_douintvec_minmax_conv_param param = {
2682 .min = (unsigned int *) table->extra1,
2683 .max = (unsigned int *) table->extra2,
2685 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2686 do_proc_douintvec_minmax_conv, ¶m);
2689 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2691 int write, void *data)
2696 val = round_pipe_size(*lvalp);
2702 unsigned int val = *valp;
2703 *lvalp = (unsigned long) val;
2709 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2710 void __user *buffer, size_t *lenp, loff_t *ppos)
2712 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2713 do_proc_dopipe_max_size_conv, NULL);
2716 static void validate_coredump_safety(void)
2718 #ifdef CONFIG_COREDUMP
2719 if (suid_dumpable == SUID_DUMP_ROOT &&
2720 core_pattern[0] != '/' && core_pattern[0] != '|') {
2722 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2723 "Pipe handler or fully qualified core dump path required.\n"
2724 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2730 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2731 void __user *buffer, size_t *lenp, loff_t *ppos)
2733 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2735 validate_coredump_safety();
2739 #ifdef CONFIG_COREDUMP
2740 static int proc_dostring_coredump(struct ctl_table *table, int write,
2741 void __user *buffer, size_t *lenp, loff_t *ppos)
2743 int error = proc_dostring(table, write, buffer, lenp, ppos);
2745 validate_coredump_safety();
2750 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2751 void __user *buffer,
2752 size_t *lenp, loff_t *ppos,
2753 unsigned long convmul,
2754 unsigned long convdiv)
2756 unsigned long *i, *min, *max;
2757 int vleft, first = 1, err = 0;
2759 char *kbuf = NULL, *p;
2761 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2766 i = (unsigned long *) data;
2767 min = (unsigned long *) table->extra1;
2768 max = (unsigned long *) table->extra2;
2769 vleft = table->maxlen / sizeof(unsigned long);
2773 if (proc_first_pos_non_zero_ignore(ppos, table))
2776 if (left > PAGE_SIZE - 1)
2777 left = PAGE_SIZE - 1;
2778 p = kbuf = memdup_user_nul(buffer, left);
2780 return PTR_ERR(kbuf);
2783 for (; left && vleft--; i++, first = 0) {
2789 left -= proc_skip_spaces(&p);
2791 err = proc_get_long(&p, &left, &val, &neg,
2793 sizeof(proc_wspace_sep), NULL);
2798 val = convmul * val / convdiv;
2799 if ((min && val < *min) || (max && val > *max))
2803 val = convdiv * (*i) / convmul;
2805 err = proc_put_char(&buffer, &left, '\t');
2809 err = proc_put_long(&buffer, &left, val, false);
2815 if (!write && !first && left && !err)
2816 err = proc_put_char(&buffer, &left, '\n');
2818 left -= proc_skip_spaces(&p);
2822 return err ? : -EINVAL;
2830 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2831 void __user *buffer,
2832 size_t *lenp, loff_t *ppos,
2833 unsigned long convmul,
2834 unsigned long convdiv)
2836 return __do_proc_doulongvec_minmax(table->data, table, write,
2837 buffer, lenp, ppos, convmul, convdiv);
2841 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2842 * @table: the sysctl table
2843 * @write: %TRUE if this is a write to the sysctl file
2844 * @buffer: the user buffer
2845 * @lenp: the size of the user buffer
2846 * @ppos: file position
2848 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2849 * values from/to the user buffer, treated as an ASCII string.
2851 * This routine will ensure the values are within the range specified by
2852 * table->extra1 (min) and table->extra2 (max).
2854 * Returns 0 on success.
2856 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2857 void __user *buffer, size_t *lenp, loff_t *ppos)
2859 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2863 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2864 * @table: the sysctl table
2865 * @write: %TRUE if this is a write to the sysctl file
2866 * @buffer: the user buffer
2867 * @lenp: the size of the user buffer
2868 * @ppos: file position
2870 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2871 * values from/to the user buffer, treated as an ASCII string. The values
2872 * are treated as milliseconds, and converted to jiffies when they are stored.
2874 * This routine will ensure the values are within the range specified by
2875 * table->extra1 (min) and table->extra2 (max).
2877 * Returns 0 on success.
2879 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2880 void __user *buffer,
2881 size_t *lenp, loff_t *ppos)
2883 return do_proc_doulongvec_minmax(table, write, buffer,
2884 lenp, ppos, HZ, 1000l);
2888 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2890 int write, void *data)
2893 if (*lvalp > INT_MAX / HZ)
2895 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2901 lval = -(unsigned long)val;
2904 lval = (unsigned long)val;
2911 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2913 int write, void *data)
2916 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2918 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2924 lval = -(unsigned long)val;
2927 lval = (unsigned long)val;
2929 *lvalp = jiffies_to_clock_t(lval);
2934 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2936 int write, void *data)
2939 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2949 lval = -(unsigned long)val;
2952 lval = (unsigned long)val;
2954 *lvalp = jiffies_to_msecs(lval);
2960 * proc_dointvec_jiffies - read a vector of integers as seconds
2961 * @table: the sysctl table
2962 * @write: %TRUE if this is a write to the sysctl file
2963 * @buffer: the user buffer
2964 * @lenp: the size of the user buffer
2965 * @ppos: file position
2967 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2968 * values from/to the user buffer, treated as an ASCII string.
2969 * The values read are assumed to be in seconds, and are converted into
2972 * Returns 0 on success.
2974 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2975 void __user *buffer, size_t *lenp, loff_t *ppos)
2977 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2978 do_proc_dointvec_jiffies_conv,NULL);
2982 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2983 * @table: the sysctl table
2984 * @write: %TRUE if this is a write to the sysctl file
2985 * @buffer: the user buffer
2986 * @lenp: the size of the user buffer
2987 * @ppos: pointer to the file position
2989 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2990 * values from/to the user buffer, treated as an ASCII string.
2991 * The values read are assumed to be in 1/USER_HZ seconds, and
2992 * are converted into jiffies.
2994 * Returns 0 on success.
2996 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2997 void __user *buffer, size_t *lenp, loff_t *ppos)
2999 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3000 do_proc_dointvec_userhz_jiffies_conv,NULL);
3004 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3005 * @table: the sysctl table
3006 * @write: %TRUE if this is a write to the sysctl file
3007 * @buffer: the user buffer
3008 * @lenp: the size of the user buffer
3009 * @ppos: file position
3010 * @ppos: the current position in the file
3012 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3013 * values from/to the user buffer, treated as an ASCII string.
3014 * The values read are assumed to be in 1/1000 seconds, and
3015 * are converted into jiffies.
3017 * Returns 0 on success.
3019 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3020 void __user *buffer, size_t *lenp, loff_t *ppos)
3022 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3023 do_proc_dointvec_ms_jiffies_conv, NULL);
3026 static int proc_do_cad_pid(struct ctl_table *table, int write,
3027 void __user *buffer, size_t *lenp, loff_t *ppos)
3029 struct pid *new_pid;
3033 tmp = pid_vnr(cad_pid);
3035 r = __do_proc_dointvec(&tmp, table, write, buffer,
3036 lenp, ppos, NULL, NULL);
3040 new_pid = find_get_pid(tmp);
3044 put_pid(xchg(&cad_pid, new_pid));
3049 * proc_do_large_bitmap - read/write from/to a large bitmap
3050 * @table: the sysctl table
3051 * @write: %TRUE if this is a write to the sysctl file
3052 * @buffer: the user buffer
3053 * @lenp: the size of the user buffer
3054 * @ppos: file position
3056 * The bitmap is stored at table->data and the bitmap length (in bits)
3059 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3060 * large bitmaps may be represented in a compact manner. Writing into
3061 * the file will clear the bitmap then update it with the given input.
3063 * Returns 0 on success.
3065 int proc_do_large_bitmap(struct ctl_table *table, int write,
3066 void __user *buffer, size_t *lenp, loff_t *ppos)
3070 size_t left = *lenp;
3071 unsigned long bitmap_len = table->maxlen;
3072 unsigned long *bitmap = *(unsigned long **) table->data;
3073 unsigned long *tmp_bitmap = NULL;
3074 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3076 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3084 if (left > PAGE_SIZE - 1)
3085 left = PAGE_SIZE - 1;
3087 p = kbuf = memdup_user_nul(buffer, left);
3089 return PTR_ERR(kbuf);
3091 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3092 sizeof(unsigned long),
3098 proc_skip_char(&p, &left, '\n');
3099 while (!err && left) {
3100 unsigned long val_a, val_b;
3103 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3107 if (val_a >= bitmap_len || neg) {
3119 err = proc_get_long(&p, &left, &val_b,
3120 &neg, tr_b, sizeof(tr_b),
3124 if (val_b >= bitmap_len || neg ||
3135 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3137 proc_skip_char(&p, &left, '\n');
3141 unsigned long bit_a, bit_b = 0;
3144 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3145 if (bit_a >= bitmap_len)
3147 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3151 err = proc_put_char(&buffer, &left, ',');
3155 err = proc_put_long(&buffer, &left, bit_a, false);
3158 if (bit_a != bit_b) {
3159 err = proc_put_char(&buffer, &left, '-');
3162 err = proc_put_long(&buffer, &left, bit_b, false);
3170 err = proc_put_char(&buffer, &left, '\n');
3176 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3178 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3188 #else /* CONFIG_PROC_SYSCTL */
3190 int proc_dostring(struct ctl_table *table, int write,
3191 void __user *buffer, size_t *lenp, loff_t *ppos)
3196 int proc_dointvec(struct ctl_table *table, int write,
3197 void __user *buffer, size_t *lenp, loff_t *ppos)
3202 int proc_douintvec(struct ctl_table *table, int write,
3203 void __user *buffer, size_t *lenp, loff_t *ppos)
3208 int proc_dointvec_minmax(struct ctl_table *table, int write,
3209 void __user *buffer, size_t *lenp, loff_t *ppos)
3214 int proc_douintvec_minmax(struct ctl_table *table, int write,
3215 void __user *buffer, size_t *lenp, loff_t *ppos)
3220 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3221 void __user *buffer, size_t *lenp, loff_t *ppos)
3226 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3227 void __user *buffer, size_t *lenp, loff_t *ppos)
3232 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3233 void __user *buffer, size_t *lenp, loff_t *ppos)
3238 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3239 void __user *buffer, size_t *lenp, loff_t *ppos)
3244 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3245 void __user *buffer,
3246 size_t *lenp, loff_t *ppos)
3252 #endif /* CONFIG_PROC_SYSCTL */
3255 * No sense putting this after each symbol definition, twice,
3256 * exception granted :-)
3258 EXPORT_SYMBOL(proc_dointvec);
3259 EXPORT_SYMBOL(proc_douintvec);
3260 EXPORT_SYMBOL(proc_dointvec_jiffies);
3261 EXPORT_SYMBOL(proc_dointvec_minmax);
3262 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3263 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3264 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3265 EXPORT_SYMBOL(proc_dostring);
3266 EXPORT_SYMBOL(proc_doulongvec_minmax);
3267 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);