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>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.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>
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
71 #include <asm/stacktrace.h>
75 #include <asm/setup.h>
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
86 #ifdef CONFIG_CHR_DEV_SG
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
95 #if defined(CONFIG_SYSCTL)
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
100 extern int max_threads;
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int compat_log;
111 extern int latencytop_enabled;
112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
114 extern int sysctl_nr_trim_pages;
117 extern int blk_iopoll_enabled;
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty = 60;
126 static int __maybe_unused one = 1;
127 static int __maybe_unused two = 2;
128 static int __maybe_unused three = 3;
129 static unsigned long one_ul = 1;
130 static int one_hundred = 100;
132 static int ten_thousand = 10000;
135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
139 static int maxolduid = 65535;
140 static int minolduid;
141 static int min_percpu_pagelist_fract = 8;
143 static int ngroups_max = NGROUPS_MAX;
144 static const int cap_last_cap = CAP_LAST_CAP;
146 #ifdef CONFIG_INOTIFY_USER
147 #include <linux/inotify.h>
152 #ifdef CONFIG_SPARC64
153 extern int sysctl_tsb_ratio;
157 extern int pwrsw_enabled;
160 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
161 extern int unaligned_enabled;
165 extern int unaligned_dump_stack;
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
169 extern int no_unaligned_warning;
172 #ifdef CONFIG_PROC_SYSCTL
173 static int proc_do_cad_pid(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175 static int proc_taint(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
184 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #ifdef CONFIG_COREDUMP
187 static int proc_dostring_coredump(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #ifdef CONFIG_MAGIC_SYSRQ
192 /* Note: sysrq code uses it's own private copy */
193 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
195 static int sysrq_sysctl_handler(ctl_table *table, int write,
196 void __user *buffer, size_t *lenp,
201 error = proc_dointvec(table, write, buffer, lenp, ppos);
206 sysrq_toggle_support(__sysrq_enabled);
213 static struct ctl_table kern_table[];
214 static struct ctl_table vm_table[];
215 static struct ctl_table fs_table[];
216 static struct ctl_table debug_table[];
217 static struct ctl_table dev_table[];
218 extern struct ctl_table random_table[];
220 extern struct ctl_table epoll_table[];
223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
224 int sysctl_legacy_va_layout;
227 /* The default sysctl tables: */
229 static struct ctl_table sysctl_base_table[] = {
231 .procname = "kernel",
248 .child = debug_table,
258 #ifdef CONFIG_SCHED_DEBUG
259 static int min_sched_granularity_ns = 100000; /* 100 usecs */
260 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 static int min_wakeup_granularity_ns; /* 0 usecs */
262 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
265 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
266 #endif /* CONFIG_SMP */
267 #endif /* CONFIG_SCHED_DEBUG */
269 #ifdef CONFIG_COMPACTION
270 static int min_extfrag_threshold;
271 static int max_extfrag_threshold = 1000;
274 static struct ctl_table kern_table[] = {
276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
280 .proc_handler = proc_dointvec,
282 #ifdef CONFIG_SCHED_DEBUG
284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
286 .maxlen = sizeof(unsigned int),
288 .proc_handler = sched_proc_update_handler,
289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
295 .maxlen = sizeof(unsigned int),
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
302 .procname = "sched_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
312 .procname = "sched_tunable_scaling",
313 .data = &sysctl_sched_tunable_scaling,
314 .maxlen = sizeof(enum sched_tunable_scaling),
316 .proc_handler = sched_proc_update_handler,
317 .extra1 = &min_sched_tunable_scaling,
318 .extra2 = &max_sched_tunable_scaling,
321 .procname = "sched_migration_cost_ns",
322 .data = &sysctl_sched_migration_cost,
323 .maxlen = sizeof(unsigned int),
325 .proc_handler = proc_dointvec,
328 .procname = "sched_nr_migrate",
329 .data = &sysctl_sched_nr_migrate,
330 .maxlen = sizeof(unsigned int),
332 .proc_handler = proc_dointvec,
335 .procname = "sched_time_avg_ms",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
339 .proc_handler = proc_dointvec,
342 .procname = "sched_shares_window_ns",
343 .data = &sysctl_sched_shares_window,
344 .maxlen = sizeof(unsigned int),
346 .proc_handler = proc_dointvec,
349 .procname = "timer_migration",
350 .data = &sysctl_timer_migration,
351 .maxlen = sizeof(unsigned int),
353 .proc_handler = proc_dointvec_minmax,
357 #endif /* CONFIG_SMP */
358 #ifdef CONFIG_NUMA_BALANCING
360 .procname = "numa_balancing_scan_delay_ms",
361 .data = &sysctl_numa_balancing_scan_delay,
362 .maxlen = sizeof(unsigned int),
364 .proc_handler = proc_dointvec,
367 .procname = "numa_balancing_scan_period_min_ms",
368 .data = &sysctl_numa_balancing_scan_period_min,
369 .maxlen = sizeof(unsigned int),
371 .proc_handler = proc_dointvec,
374 .procname = "numa_balancing_scan_period_reset",
375 .data = &sysctl_numa_balancing_scan_period_reset,
376 .maxlen = sizeof(unsigned int),
378 .proc_handler = proc_dointvec,
381 .procname = "numa_balancing_scan_period_max_ms",
382 .data = &sysctl_numa_balancing_scan_period_max,
383 .maxlen = sizeof(unsigned int),
385 .proc_handler = proc_dointvec,
388 .procname = "numa_balancing_scan_size_mb",
389 .data = &sysctl_numa_balancing_scan_size,
390 .maxlen = sizeof(unsigned int),
392 .proc_handler = proc_dointvec,
394 #endif /* CONFIG_NUMA_BALANCING */
395 #endif /* CONFIG_SCHED_DEBUG */
397 .procname = "sched_rt_period_us",
398 .data = &sysctl_sched_rt_period,
399 .maxlen = sizeof(unsigned int),
401 .proc_handler = sched_rt_handler,
404 .procname = "sched_rt_runtime_us",
405 .data = &sysctl_sched_rt_runtime,
406 .maxlen = sizeof(int),
408 .proc_handler = sched_rt_handler,
411 .procname = "sched_rr_timeslice_ms",
412 .data = &sched_rr_timeslice,
413 .maxlen = sizeof(int),
415 .proc_handler = sched_rr_handler,
417 #ifdef CONFIG_SCHED_AUTOGROUP
419 .procname = "sched_autogroup_enabled",
420 .data = &sysctl_sched_autogroup_enabled,
421 .maxlen = sizeof(unsigned int),
423 .proc_handler = proc_dointvec_minmax,
428 #ifdef CONFIG_CFS_BANDWIDTH
430 .procname = "sched_cfs_bandwidth_slice_us",
431 .data = &sysctl_sched_cfs_bandwidth_slice,
432 .maxlen = sizeof(unsigned int),
434 .proc_handler = proc_dointvec_minmax,
438 #ifdef CONFIG_PROVE_LOCKING
440 .procname = "prove_locking",
441 .data = &prove_locking,
442 .maxlen = sizeof(int),
444 .proc_handler = proc_dointvec,
447 #ifdef CONFIG_LOCK_STAT
449 .procname = "lock_stat",
451 .maxlen = sizeof(int),
453 .proc_handler = proc_dointvec,
458 .data = &panic_timeout,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec,
463 #ifdef CONFIG_COREDUMP
465 .procname = "core_uses_pid",
466 .data = &core_uses_pid,
467 .maxlen = sizeof(int),
469 .proc_handler = proc_dointvec,
472 .procname = "core_pattern",
473 .data = core_pattern,
474 .maxlen = CORENAME_MAX_SIZE,
476 .proc_handler = proc_dostring_coredump,
479 .procname = "core_pipe_limit",
480 .data = &core_pipe_limit,
481 .maxlen = sizeof(unsigned int),
483 .proc_handler = proc_dointvec,
486 #ifdef CONFIG_PROC_SYSCTL
488 .procname = "tainted",
489 .maxlen = sizeof(long),
491 .proc_handler = proc_taint,
494 #ifdef CONFIG_LATENCYTOP
496 .procname = "latencytop",
497 .data = &latencytop_enabled,
498 .maxlen = sizeof(int),
500 .proc_handler = proc_dointvec,
503 #ifdef CONFIG_BLK_DEV_INITRD
505 .procname = "real-root-dev",
506 .data = &real_root_dev,
507 .maxlen = sizeof(int),
509 .proc_handler = proc_dointvec,
513 .procname = "print-fatal-signals",
514 .data = &print_fatal_signals,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec,
521 .procname = "reboot-cmd",
522 .data = reboot_command,
525 .proc_handler = proc_dostring,
528 .procname = "stop-a",
529 .data = &stop_a_enabled,
530 .maxlen = sizeof (int),
532 .proc_handler = proc_dointvec,
535 .procname = "scons-poweroff",
536 .data = &scons_pwroff,
537 .maxlen = sizeof (int),
539 .proc_handler = proc_dointvec,
542 #ifdef CONFIG_SPARC64
544 .procname = "tsb-ratio",
545 .data = &sysctl_tsb_ratio,
546 .maxlen = sizeof (int),
548 .proc_handler = proc_dointvec,
553 .procname = "soft-power",
554 .data = &pwrsw_enabled,
555 .maxlen = sizeof (int),
557 .proc_handler = proc_dointvec,
560 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
562 .procname = "unaligned-trap",
563 .data = &unaligned_enabled,
564 .maxlen = sizeof (int),
566 .proc_handler = proc_dointvec,
570 .procname = "ctrl-alt-del",
572 .maxlen = sizeof(int),
574 .proc_handler = proc_dointvec,
576 #ifdef CONFIG_FUNCTION_TRACER
578 .procname = "ftrace_enabled",
579 .data = &ftrace_enabled,
580 .maxlen = sizeof(int),
582 .proc_handler = ftrace_enable_sysctl,
585 #ifdef CONFIG_STACK_TRACER
587 .procname = "stack_tracer_enabled",
588 .data = &stack_tracer_enabled,
589 .maxlen = sizeof(int),
591 .proc_handler = stack_trace_sysctl,
594 #ifdef CONFIG_TRACING
596 .procname = "ftrace_dump_on_oops",
597 .data = &ftrace_dump_on_oops,
598 .maxlen = sizeof(int),
600 .proc_handler = proc_dointvec,
603 .procname = "traceoff_on_warning",
604 .data = &__disable_trace_on_warning,
605 .maxlen = sizeof(__disable_trace_on_warning),
607 .proc_handler = proc_dointvec,
610 #ifdef CONFIG_MODULES
612 .procname = "modprobe",
613 .data = &modprobe_path,
614 .maxlen = KMOD_PATH_LEN,
616 .proc_handler = proc_dostring,
619 .procname = "modules_disabled",
620 .data = &modules_disabled,
621 .maxlen = sizeof(int),
623 /* only handle a transition from default "0" to "1" */
624 .proc_handler = proc_dointvec_minmax,
631 .procname = "hotplug",
632 .data = &uevent_helper,
633 .maxlen = UEVENT_HELPER_PATH_LEN,
635 .proc_handler = proc_dostring,
638 #ifdef CONFIG_CHR_DEV_SG
640 .procname = "sg-big-buff",
641 .data = &sg_big_buff,
642 .maxlen = sizeof (int),
644 .proc_handler = proc_dointvec,
647 #ifdef CONFIG_BSD_PROCESS_ACCT
651 .maxlen = 3*sizeof(int),
653 .proc_handler = proc_dointvec,
656 #ifdef CONFIG_MAGIC_SYSRQ
659 .data = &__sysrq_enabled,
660 .maxlen = sizeof (int),
662 .proc_handler = sysrq_sysctl_handler,
665 #ifdef CONFIG_PROC_SYSCTL
667 .procname = "cad_pid",
669 .maxlen = sizeof (int),
671 .proc_handler = proc_do_cad_pid,
675 .procname = "threads-max",
676 .data = &max_threads,
677 .maxlen = sizeof(int),
679 .proc_handler = proc_dointvec,
682 .procname = "random",
684 .child = random_table,
687 .procname = "usermodehelper",
689 .child = usermodehelper_table,
692 .procname = "overflowuid",
693 .data = &overflowuid,
694 .maxlen = sizeof(int),
696 .proc_handler = proc_dointvec_minmax,
697 .extra1 = &minolduid,
698 .extra2 = &maxolduid,
701 .procname = "overflowgid",
702 .data = &overflowgid,
703 .maxlen = sizeof(int),
705 .proc_handler = proc_dointvec_minmax,
706 .extra1 = &minolduid,
707 .extra2 = &maxolduid,
710 #ifdef CONFIG_MATHEMU
712 .procname = "ieee_emulation_warnings",
713 .data = &sysctl_ieee_emulation_warnings,
714 .maxlen = sizeof(int),
716 .proc_handler = proc_dointvec,
720 .procname = "userprocess_debug",
721 .data = &show_unhandled_signals,
722 .maxlen = sizeof(int),
724 .proc_handler = proc_dointvec,
728 .procname = "pid_max",
730 .maxlen = sizeof (int),
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &pid_max_min,
734 .extra2 = &pid_max_max,
737 .procname = "panic_on_oops",
738 .data = &panic_on_oops,
739 .maxlen = sizeof(int),
741 .proc_handler = proc_dointvec,
743 #if defined CONFIG_PRINTK
745 .procname = "printk",
746 .data = &console_loglevel,
747 .maxlen = 4*sizeof(int),
749 .proc_handler = proc_dointvec,
752 .procname = "printk_ratelimit",
753 .data = &printk_ratelimit_state.interval,
754 .maxlen = sizeof(int),
756 .proc_handler = proc_dointvec_jiffies,
759 .procname = "printk_ratelimit_burst",
760 .data = &printk_ratelimit_state.burst,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec,
766 .procname = "printk_delay",
767 .data = &printk_delay_msec,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec_minmax,
772 .extra2 = &ten_thousand,
775 .procname = "dmesg_restrict",
776 .data = &dmesg_restrict,
777 .maxlen = sizeof(int),
779 .proc_handler = proc_dointvec_minmax_sysadmin,
784 .procname = "kptr_restrict",
785 .data = &kptr_restrict,
786 .maxlen = sizeof(int),
788 .proc_handler = proc_dointvec_minmax_sysadmin,
794 .procname = "ngroups_max",
795 .data = &ngroups_max,
796 .maxlen = sizeof (int),
798 .proc_handler = proc_dointvec,
801 .procname = "cap_last_cap",
802 .data = (void *)&cap_last_cap,
803 .maxlen = sizeof(int),
805 .proc_handler = proc_dointvec,
807 #if defined(CONFIG_LOCKUP_DETECTOR)
809 .procname = "watchdog",
810 .data = &watchdog_user_enabled,
811 .maxlen = sizeof (int),
813 .proc_handler = proc_dowatchdog,
818 .procname = "watchdog_thresh",
819 .data = &watchdog_thresh,
820 .maxlen = sizeof(int),
822 .proc_handler = proc_dowatchdog,
827 .procname = "softlockup_panic",
828 .data = &softlockup_panic,
829 .maxlen = sizeof(int),
831 .proc_handler = proc_dointvec_minmax,
836 .procname = "nmi_watchdog",
837 .data = &watchdog_user_enabled,
838 .maxlen = sizeof (int),
840 .proc_handler = proc_dowatchdog,
845 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
847 .procname = "unknown_nmi_panic",
848 .data = &unknown_nmi_panic,
849 .maxlen = sizeof (int),
851 .proc_handler = proc_dointvec,
854 #if defined(CONFIG_X86)
856 .procname = "panic_on_unrecovered_nmi",
857 .data = &panic_on_unrecovered_nmi,
858 .maxlen = sizeof(int),
860 .proc_handler = proc_dointvec,
863 .procname = "panic_on_io_nmi",
864 .data = &panic_on_io_nmi,
865 .maxlen = sizeof(int),
867 .proc_handler = proc_dointvec,
869 #ifdef CONFIG_DEBUG_STACKOVERFLOW
871 .procname = "panic_on_stackoverflow",
872 .data = &sysctl_panic_on_stackoverflow,
873 .maxlen = sizeof(int),
875 .proc_handler = proc_dointvec,
879 .procname = "bootloader_type",
880 .data = &bootloader_type,
881 .maxlen = sizeof (int),
883 .proc_handler = proc_dointvec,
886 .procname = "bootloader_version",
887 .data = &bootloader_version,
888 .maxlen = sizeof (int),
890 .proc_handler = proc_dointvec,
893 .procname = "kstack_depth_to_print",
894 .data = &kstack_depth_to_print,
895 .maxlen = sizeof(int),
897 .proc_handler = proc_dointvec,
900 .procname = "io_delay_type",
901 .data = &io_delay_type,
902 .maxlen = sizeof(int),
904 .proc_handler = proc_dointvec,
907 #if defined(CONFIG_MMU)
909 .procname = "randomize_va_space",
910 .data = &randomize_va_space,
911 .maxlen = sizeof(int),
913 .proc_handler = proc_dointvec,
916 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
918 .procname = "spin_retry",
920 .maxlen = sizeof (int),
922 .proc_handler = proc_dointvec,
925 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
927 .procname = "acpi_video_flags",
928 .data = &acpi_realmode_flags,
929 .maxlen = sizeof (unsigned long),
931 .proc_handler = proc_doulongvec_minmax,
934 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
936 .procname = "ignore-unaligned-usertrap",
937 .data = &no_unaligned_warning,
938 .maxlen = sizeof (int),
940 .proc_handler = proc_dointvec,
945 .procname = "unaligned-dump-stack",
946 .data = &unaligned_dump_stack,
947 .maxlen = sizeof (int),
949 .proc_handler = proc_dointvec,
952 #ifdef CONFIG_DETECT_HUNG_TASK
954 .procname = "hung_task_panic",
955 .data = &sysctl_hung_task_panic,
956 .maxlen = sizeof(int),
958 .proc_handler = proc_dointvec_minmax,
963 .procname = "hung_task_check_count",
964 .data = &sysctl_hung_task_check_count,
965 .maxlen = sizeof(unsigned long),
967 .proc_handler = proc_doulongvec_minmax,
970 .procname = "hung_task_timeout_secs",
971 .data = &sysctl_hung_task_timeout_secs,
972 .maxlen = sizeof(unsigned long),
974 .proc_handler = proc_dohung_task_timeout_secs,
977 .procname = "hung_task_warnings",
978 .data = &sysctl_hung_task_warnings,
979 .maxlen = sizeof(unsigned long),
981 .proc_handler = proc_doulongvec_minmax,
986 .procname = "compat-log",
988 .maxlen = sizeof (int),
990 .proc_handler = proc_dointvec,
993 #ifdef CONFIG_RT_MUTEXES
995 .procname = "max_lock_depth",
996 .data = &max_lock_depth,
997 .maxlen = sizeof(int),
999 .proc_handler = proc_dointvec,
1003 .procname = "poweroff_cmd",
1004 .data = &poweroff_cmd,
1005 .maxlen = POWEROFF_CMD_PATH_LEN,
1007 .proc_handler = proc_dostring,
1013 .child = key_sysctls,
1016 #ifdef CONFIG_RCU_TORTURE_TEST
1018 .procname = "rcutorture_runnable",
1019 .data = &rcutorture_runnable,
1020 .maxlen = sizeof(int),
1022 .proc_handler = proc_dointvec,
1025 #ifdef CONFIG_PERF_EVENTS
1027 * User-space scripts rely on the existence of this file
1028 * as a feature check for perf_events being enabled.
1030 * So it's an ABI, do not remove!
1033 .procname = "perf_event_paranoid",
1034 .data = &sysctl_perf_event_paranoid,
1035 .maxlen = sizeof(sysctl_perf_event_paranoid),
1037 .proc_handler = proc_dointvec,
1040 .procname = "perf_event_mlock_kb",
1041 .data = &sysctl_perf_event_mlock,
1042 .maxlen = sizeof(sysctl_perf_event_mlock),
1044 .proc_handler = proc_dointvec,
1047 .procname = "perf_event_max_sample_rate",
1048 .data = &sysctl_perf_event_sample_rate,
1049 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1051 .proc_handler = perf_proc_update_handler,
1054 .procname = "perf_cpu_time_max_percent",
1055 .data = &sysctl_perf_cpu_time_max_percent,
1056 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1058 .proc_handler = perf_cpu_time_max_percent_handler,
1060 .extra2 = &one_hundred,
1063 #ifdef CONFIG_KMEMCHECK
1065 .procname = "kmemcheck",
1066 .data = &kmemcheck_enabled,
1067 .maxlen = sizeof(int),
1069 .proc_handler = proc_dointvec,
1074 .procname = "blk_iopoll",
1075 .data = &blk_iopoll_enabled,
1076 .maxlen = sizeof(int),
1078 .proc_handler = proc_dointvec,
1084 static struct ctl_table vm_table[] = {
1086 .procname = "overcommit_memory",
1087 .data = &sysctl_overcommit_memory,
1088 .maxlen = sizeof(sysctl_overcommit_memory),
1090 .proc_handler = proc_dointvec_minmax,
1095 .procname = "panic_on_oom",
1096 .data = &sysctl_panic_on_oom,
1097 .maxlen = sizeof(sysctl_panic_on_oom),
1099 .proc_handler = proc_dointvec_minmax,
1104 .procname = "oom_kill_allocating_task",
1105 .data = &sysctl_oom_kill_allocating_task,
1106 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1108 .proc_handler = proc_dointvec,
1111 .procname = "oom_dump_tasks",
1112 .data = &sysctl_oom_dump_tasks,
1113 .maxlen = sizeof(sysctl_oom_dump_tasks),
1115 .proc_handler = proc_dointvec,
1118 .procname = "overcommit_ratio",
1119 .data = &sysctl_overcommit_ratio,
1120 .maxlen = sizeof(sysctl_overcommit_ratio),
1122 .proc_handler = proc_dointvec,
1125 .procname = "page-cluster",
1126 .data = &page_cluster,
1127 .maxlen = sizeof(int),
1129 .proc_handler = proc_dointvec_minmax,
1133 .procname = "dirty_background_ratio",
1134 .data = &dirty_background_ratio,
1135 .maxlen = sizeof(dirty_background_ratio),
1137 .proc_handler = dirty_background_ratio_handler,
1139 .extra2 = &one_hundred,
1142 .procname = "dirty_background_bytes",
1143 .data = &dirty_background_bytes,
1144 .maxlen = sizeof(dirty_background_bytes),
1146 .proc_handler = dirty_background_bytes_handler,
1150 .procname = "dirty_ratio",
1151 .data = &vm_dirty_ratio,
1152 .maxlen = sizeof(vm_dirty_ratio),
1154 .proc_handler = dirty_ratio_handler,
1156 .extra2 = &one_hundred,
1159 .procname = "dirty_bytes",
1160 .data = &vm_dirty_bytes,
1161 .maxlen = sizeof(vm_dirty_bytes),
1163 .proc_handler = dirty_bytes_handler,
1164 .extra1 = &dirty_bytes_min,
1167 .procname = "dirty_writeback_centisecs",
1168 .data = &dirty_writeback_interval,
1169 .maxlen = sizeof(dirty_writeback_interval),
1171 .proc_handler = dirty_writeback_centisecs_handler,
1174 .procname = "dirty_expire_centisecs",
1175 .data = &dirty_expire_interval,
1176 .maxlen = sizeof(dirty_expire_interval),
1178 .proc_handler = proc_dointvec_minmax,
1182 .procname = "nr_pdflush_threads",
1183 .mode = 0444 /* read-only */,
1184 .proc_handler = pdflush_proc_obsolete,
1187 .procname = "swappiness",
1188 .data = &vm_swappiness,
1189 .maxlen = sizeof(vm_swappiness),
1191 .proc_handler = proc_dointvec_minmax,
1193 .extra2 = &one_hundred,
1195 #ifdef CONFIG_HUGETLB_PAGE
1197 .procname = "nr_hugepages",
1199 .maxlen = sizeof(unsigned long),
1201 .proc_handler = hugetlb_sysctl_handler,
1202 .extra1 = (void *)&hugetlb_zero,
1203 .extra2 = (void *)&hugetlb_infinity,
1207 .procname = "nr_hugepages_mempolicy",
1209 .maxlen = sizeof(unsigned long),
1211 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1212 .extra1 = (void *)&hugetlb_zero,
1213 .extra2 = (void *)&hugetlb_infinity,
1217 .procname = "hugetlb_shm_group",
1218 .data = &sysctl_hugetlb_shm_group,
1219 .maxlen = sizeof(gid_t),
1221 .proc_handler = proc_dointvec,
1224 .procname = "hugepages_treat_as_movable",
1225 .data = &hugepages_treat_as_movable,
1226 .maxlen = sizeof(int),
1228 .proc_handler = hugetlb_treat_movable_handler,
1231 .procname = "nr_overcommit_hugepages",
1233 .maxlen = sizeof(unsigned long),
1235 .proc_handler = hugetlb_overcommit_handler,
1236 .extra1 = (void *)&hugetlb_zero,
1237 .extra2 = (void *)&hugetlb_infinity,
1241 .procname = "lowmem_reserve_ratio",
1242 .data = &sysctl_lowmem_reserve_ratio,
1243 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1245 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1248 .procname = "drop_caches",
1249 .data = &sysctl_drop_caches,
1250 .maxlen = sizeof(int),
1252 .proc_handler = drop_caches_sysctl_handler,
1256 #ifdef CONFIG_COMPACTION
1258 .procname = "compact_memory",
1259 .data = &sysctl_compact_memory,
1260 .maxlen = sizeof(int),
1262 .proc_handler = sysctl_compaction_handler,
1265 .procname = "extfrag_threshold",
1266 .data = &sysctl_extfrag_threshold,
1267 .maxlen = sizeof(int),
1269 .proc_handler = sysctl_extfrag_handler,
1270 .extra1 = &min_extfrag_threshold,
1271 .extra2 = &max_extfrag_threshold,
1274 #endif /* CONFIG_COMPACTION */
1276 .procname = "min_free_kbytes",
1277 .data = &min_free_kbytes,
1278 .maxlen = sizeof(min_free_kbytes),
1280 .proc_handler = min_free_kbytes_sysctl_handler,
1284 .procname = "percpu_pagelist_fraction",
1285 .data = &percpu_pagelist_fraction,
1286 .maxlen = sizeof(percpu_pagelist_fraction),
1288 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1289 .extra1 = &min_percpu_pagelist_fract,
1293 .procname = "max_map_count",
1294 .data = &sysctl_max_map_count,
1295 .maxlen = sizeof(sysctl_max_map_count),
1297 .proc_handler = proc_dointvec_minmax,
1302 .procname = "nr_trim_pages",
1303 .data = &sysctl_nr_trim_pages,
1304 .maxlen = sizeof(sysctl_nr_trim_pages),
1306 .proc_handler = proc_dointvec_minmax,
1311 .procname = "laptop_mode",
1312 .data = &laptop_mode,
1313 .maxlen = sizeof(laptop_mode),
1315 .proc_handler = proc_dointvec_jiffies,
1318 .procname = "block_dump",
1319 .data = &block_dump,
1320 .maxlen = sizeof(block_dump),
1322 .proc_handler = proc_dointvec,
1326 .procname = "vfs_cache_pressure",
1327 .data = &sysctl_vfs_cache_pressure,
1328 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1330 .proc_handler = proc_dointvec,
1333 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1335 .procname = "legacy_va_layout",
1336 .data = &sysctl_legacy_va_layout,
1337 .maxlen = sizeof(sysctl_legacy_va_layout),
1339 .proc_handler = proc_dointvec,
1345 .procname = "zone_reclaim_mode",
1346 .data = &zone_reclaim_mode,
1347 .maxlen = sizeof(zone_reclaim_mode),
1349 .proc_handler = proc_dointvec,
1353 .procname = "min_unmapped_ratio",
1354 .data = &sysctl_min_unmapped_ratio,
1355 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1357 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1359 .extra2 = &one_hundred,
1362 .procname = "min_slab_ratio",
1363 .data = &sysctl_min_slab_ratio,
1364 .maxlen = sizeof(sysctl_min_slab_ratio),
1366 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1368 .extra2 = &one_hundred,
1373 .procname = "stat_interval",
1374 .data = &sysctl_stat_interval,
1375 .maxlen = sizeof(sysctl_stat_interval),
1377 .proc_handler = proc_dointvec_jiffies,
1382 .procname = "mmap_min_addr",
1383 .data = &dac_mmap_min_addr,
1384 .maxlen = sizeof(unsigned long),
1386 .proc_handler = mmap_min_addr_handler,
1391 .procname = "numa_zonelist_order",
1392 .data = &numa_zonelist_order,
1393 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1395 .proc_handler = numa_zonelist_order_handler,
1398 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1399 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1401 .procname = "vdso_enabled",
1402 .data = &vdso_enabled,
1403 .maxlen = sizeof(vdso_enabled),
1405 .proc_handler = proc_dointvec,
1409 #ifdef CONFIG_HIGHMEM
1411 .procname = "highmem_is_dirtyable",
1412 .data = &vm_highmem_is_dirtyable,
1413 .maxlen = sizeof(vm_highmem_is_dirtyable),
1415 .proc_handler = proc_dointvec_minmax,
1421 .procname = "scan_unevictable_pages",
1422 .data = &scan_unevictable_pages,
1423 .maxlen = sizeof(scan_unevictable_pages),
1425 .proc_handler = scan_unevictable_handler,
1427 #ifdef CONFIG_MEMORY_FAILURE
1429 .procname = "memory_failure_early_kill",
1430 .data = &sysctl_memory_failure_early_kill,
1431 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1433 .proc_handler = proc_dointvec_minmax,
1438 .procname = "memory_failure_recovery",
1439 .data = &sysctl_memory_failure_recovery,
1440 .maxlen = sizeof(sysctl_memory_failure_recovery),
1442 .proc_handler = proc_dointvec_minmax,
1448 .procname = "user_reserve_kbytes",
1449 .data = &sysctl_user_reserve_kbytes,
1450 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1452 .proc_handler = proc_doulongvec_minmax,
1455 .procname = "admin_reserve_kbytes",
1456 .data = &sysctl_admin_reserve_kbytes,
1457 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1459 .proc_handler = proc_doulongvec_minmax,
1464 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1465 static struct ctl_table binfmt_misc_table[] = {
1470 static struct ctl_table fs_table[] = {
1472 .procname = "inode-nr",
1473 .data = &inodes_stat,
1474 .maxlen = 2*sizeof(long),
1476 .proc_handler = proc_nr_inodes,
1479 .procname = "inode-state",
1480 .data = &inodes_stat,
1481 .maxlen = 7*sizeof(long),
1483 .proc_handler = proc_nr_inodes,
1486 .procname = "file-nr",
1487 .data = &files_stat,
1488 .maxlen = sizeof(files_stat),
1490 .proc_handler = proc_nr_files,
1493 .procname = "file-max",
1494 .data = &files_stat.max_files,
1495 .maxlen = sizeof(files_stat.max_files),
1497 .proc_handler = proc_doulongvec_minmax,
1500 .procname = "nr_open",
1501 .data = &sysctl_nr_open,
1502 .maxlen = sizeof(int),
1504 .proc_handler = proc_dointvec_minmax,
1505 .extra1 = &sysctl_nr_open_min,
1506 .extra2 = &sysctl_nr_open_max,
1509 .procname = "dentry-state",
1510 .data = &dentry_stat,
1511 .maxlen = 6*sizeof(long),
1513 .proc_handler = proc_nr_dentry,
1516 .procname = "overflowuid",
1517 .data = &fs_overflowuid,
1518 .maxlen = sizeof(int),
1520 .proc_handler = proc_dointvec_minmax,
1521 .extra1 = &minolduid,
1522 .extra2 = &maxolduid,
1525 .procname = "overflowgid",
1526 .data = &fs_overflowgid,
1527 .maxlen = sizeof(int),
1529 .proc_handler = proc_dointvec_minmax,
1530 .extra1 = &minolduid,
1531 .extra2 = &maxolduid,
1533 #ifdef CONFIG_FILE_LOCKING
1535 .procname = "leases-enable",
1536 .data = &leases_enable,
1537 .maxlen = sizeof(int),
1539 .proc_handler = proc_dointvec,
1542 #ifdef CONFIG_DNOTIFY
1544 .procname = "dir-notify-enable",
1545 .data = &dir_notify_enable,
1546 .maxlen = sizeof(int),
1548 .proc_handler = proc_dointvec,
1552 #ifdef CONFIG_FILE_LOCKING
1554 .procname = "lease-break-time",
1555 .data = &lease_break_time,
1556 .maxlen = sizeof(int),
1558 .proc_handler = proc_dointvec,
1563 .procname = "aio-nr",
1565 .maxlen = sizeof(aio_nr),
1567 .proc_handler = proc_doulongvec_minmax,
1570 .procname = "aio-max-nr",
1571 .data = &aio_max_nr,
1572 .maxlen = sizeof(aio_max_nr),
1574 .proc_handler = proc_doulongvec_minmax,
1576 #endif /* CONFIG_AIO */
1577 #ifdef CONFIG_INOTIFY_USER
1579 .procname = "inotify",
1581 .child = inotify_table,
1586 .procname = "epoll",
1588 .child = epoll_table,
1593 .procname = "protected_symlinks",
1594 .data = &sysctl_protected_symlinks,
1595 .maxlen = sizeof(int),
1597 .proc_handler = proc_dointvec_minmax,
1602 .procname = "protected_hardlinks",
1603 .data = &sysctl_protected_hardlinks,
1604 .maxlen = sizeof(int),
1606 .proc_handler = proc_dointvec_minmax,
1611 .procname = "suid_dumpable",
1612 .data = &suid_dumpable,
1613 .maxlen = sizeof(int),
1615 .proc_handler = proc_dointvec_minmax_coredump,
1619 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1621 .procname = "binfmt_misc",
1623 .child = binfmt_misc_table,
1627 .procname = "pipe-max-size",
1628 .data = &pipe_max_size,
1629 .maxlen = sizeof(int),
1631 .proc_handler = &pipe_proc_fn,
1632 .extra1 = &pipe_min_size,
1637 static struct ctl_table debug_table[] = {
1638 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1640 .procname = "exception-trace",
1641 .data = &show_unhandled_signals,
1642 .maxlen = sizeof(int),
1644 .proc_handler = proc_dointvec
1647 #if defined(CONFIG_OPTPROBES)
1649 .procname = "kprobes-optimization",
1650 .data = &sysctl_kprobes_optimization,
1651 .maxlen = sizeof(int),
1653 .proc_handler = proc_kprobes_optimization_handler,
1661 static struct ctl_table dev_table[] = {
1665 int __init sysctl_init(void)
1667 struct ctl_table_header *hdr;
1669 hdr = register_sysctl_table(sysctl_base_table);
1670 kmemleak_not_leak(hdr);
1674 #endif /* CONFIG_SYSCTL */
1680 #ifdef CONFIG_PROC_SYSCTL
1682 static int _proc_do_string(void* data, int maxlen, int write,
1683 void __user *buffer,
1684 size_t *lenp, loff_t *ppos)
1690 if (!data || !maxlen || !*lenp) {
1698 while (len < *lenp) {
1699 if (get_user(c, p++))
1701 if (c == 0 || c == '\n')
1707 if(copy_from_user(data, buffer, len))
1709 ((char *) data)[len] = 0;
1727 if(copy_to_user(buffer, data, len))
1730 if(put_user('\n', ((char __user *) buffer) + len))
1741 * proc_dostring - read a string sysctl
1742 * @table: the sysctl table
1743 * @write: %TRUE if this is a write to the sysctl file
1744 * @buffer: the user buffer
1745 * @lenp: the size of the user buffer
1746 * @ppos: file position
1748 * Reads/writes a string from/to the user buffer. If the kernel
1749 * buffer provided is not large enough to hold the string, the
1750 * string is truncated. The copied string is %NULL-terminated.
1751 * If the string is being read by the user process, it is copied
1752 * and a newline '\n' is added. It is truncated if the buffer is
1755 * Returns 0 on success.
1757 int proc_dostring(struct ctl_table *table, int write,
1758 void __user *buffer, size_t *lenp, loff_t *ppos)
1760 return _proc_do_string(table->data, table->maxlen, write,
1761 buffer, lenp, ppos);
1764 static size_t proc_skip_spaces(char **buf)
1767 char *tmp = skip_spaces(*buf);
1773 static void proc_skip_char(char **buf, size_t *size, const char v)
1783 #define TMPBUFLEN 22
1785 * proc_get_long - reads an ASCII formatted integer from a user buffer
1787 * @buf: a kernel buffer
1788 * @size: size of the kernel buffer
1789 * @val: this is where the number will be stored
1790 * @neg: set to %TRUE if number is negative
1791 * @perm_tr: a vector which contains the allowed trailers
1792 * @perm_tr_len: size of the perm_tr vector
1793 * @tr: pointer to store the trailer character
1795 * In case of success %0 is returned and @buf and @size are updated with
1796 * the amount of bytes read. If @tr is non-NULL and a trailing
1797 * character exists (size is non-zero after returning from this
1798 * function), @tr is updated with the trailing character.
1800 static int proc_get_long(char **buf, size_t *size,
1801 unsigned long *val, bool *neg,
1802 const char *perm_tr, unsigned perm_tr_len, char *tr)
1805 char *p, tmp[TMPBUFLEN];
1811 if (len > TMPBUFLEN - 1)
1812 len = TMPBUFLEN - 1;
1814 memcpy(tmp, *buf, len);
1818 if (*p == '-' && *size > 1) {
1826 *val = simple_strtoul(p, &p, 0);
1830 /* We don't know if the next char is whitespace thus we may accept
1831 * invalid integers (e.g. 1234...a) or two integers instead of one
1832 * (e.g. 123...1). So lets not allow such large numbers. */
1833 if (len == TMPBUFLEN - 1)
1836 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1839 if (tr && (len < *size))
1849 * proc_put_long - converts an integer to a decimal ASCII formatted string
1851 * @buf: the user buffer
1852 * @size: the size of the user buffer
1853 * @val: the integer to be converted
1854 * @neg: sign of the number, %TRUE for negative
1856 * In case of success %0 is returned and @buf and @size are updated with
1857 * the amount of bytes written.
1859 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1863 char tmp[TMPBUFLEN], *p = tmp;
1865 sprintf(p, "%s%lu", neg ? "-" : "", val);
1869 if (copy_to_user(*buf, tmp, len))
1877 static int proc_put_char(void __user **buf, size_t *size, char c)
1880 char __user **buffer = (char __user **)buf;
1881 if (put_user(c, *buffer))
1883 (*size)--, (*buffer)++;
1889 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1891 int write, void *data)
1894 *valp = *negp ? -*lvalp : *lvalp;
1899 *lvalp = (unsigned long)-val;
1902 *lvalp = (unsigned long)val;
1908 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1910 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1911 int write, void __user *buffer,
1912 size_t *lenp, loff_t *ppos,
1913 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1914 int write, void *data),
1917 int *i, vleft, first = 1, err = 0;
1918 unsigned long page = 0;
1922 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1927 i = (int *) tbl_data;
1928 vleft = table->maxlen / sizeof(*i);
1932 conv = do_proc_dointvec_conv;
1935 if (left > PAGE_SIZE - 1)
1936 left = PAGE_SIZE - 1;
1937 page = __get_free_page(GFP_TEMPORARY);
1938 kbuf = (char *) page;
1941 if (copy_from_user(kbuf, buffer, left)) {
1948 for (; left && vleft--; i++, first=0) {
1953 left -= proc_skip_spaces(&kbuf);
1957 err = proc_get_long(&kbuf, &left, &lval, &neg,
1959 sizeof(proc_wspace_sep), NULL);
1962 if (conv(&neg, &lval, i, 1, data)) {
1967 if (conv(&neg, &lval, i, 0, data)) {
1972 err = proc_put_char(&buffer, &left, '\t');
1975 err = proc_put_long(&buffer, &left, lval, neg);
1981 if (!write && !first && left && !err)
1982 err = proc_put_char(&buffer, &left, '\n');
1983 if (write && !err && left)
1984 left -= proc_skip_spaces(&kbuf);
1989 return err ? : -EINVAL;
1996 static int do_proc_dointvec(struct ctl_table *table, int write,
1997 void __user *buffer, size_t *lenp, loff_t *ppos,
1998 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1999 int write, void *data),
2002 return __do_proc_dointvec(table->data, table, write,
2003 buffer, lenp, ppos, conv, data);
2007 * proc_dointvec - read a vector of integers
2008 * @table: the sysctl table
2009 * @write: %TRUE if this is a write to the sysctl file
2010 * @buffer: the user buffer
2011 * @lenp: the size of the user buffer
2012 * @ppos: file position
2014 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2015 * values from/to the user buffer, treated as an ASCII string.
2017 * Returns 0 on success.
2019 int proc_dointvec(struct ctl_table *table, int write,
2020 void __user *buffer, size_t *lenp, loff_t *ppos)
2022 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2027 * Taint values can only be increased
2028 * This means we can safely use a temporary.
2030 static int proc_taint(struct ctl_table *table, int write,
2031 void __user *buffer, size_t *lenp, loff_t *ppos)
2034 unsigned long tmptaint = get_taint();
2037 if (write && !capable(CAP_SYS_ADMIN))
2042 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2048 * Poor man's atomic or. Not worth adding a primitive
2049 * to everyone's atomic.h for this
2052 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2053 if ((tmptaint >> i) & 1)
2054 add_taint(i, LOCKDEP_STILL_OK);
2061 #ifdef CONFIG_PRINTK
2062 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2063 void __user *buffer, size_t *lenp, loff_t *ppos)
2065 if (write && !capable(CAP_SYS_ADMIN))
2068 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2072 struct do_proc_dointvec_minmax_conv_param {
2077 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2079 int write, void *data)
2081 struct do_proc_dointvec_minmax_conv_param *param = data;
2083 int val = *negp ? -*lvalp : *lvalp;
2084 if ((param->min && *param->min > val) ||
2085 (param->max && *param->max < val))
2092 *lvalp = (unsigned long)-val;
2095 *lvalp = (unsigned long)val;
2102 * proc_dointvec_minmax - read a vector of integers with min/max values
2103 * @table: the sysctl table
2104 * @write: %TRUE if this is a write to the sysctl file
2105 * @buffer: the user buffer
2106 * @lenp: the size of the user buffer
2107 * @ppos: file position
2109 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2110 * values from/to the user buffer, treated as an ASCII string.
2112 * This routine will ensure the values are within the range specified by
2113 * table->extra1 (min) and table->extra2 (max).
2115 * Returns 0 on success.
2117 int proc_dointvec_minmax(struct ctl_table *table, int write,
2118 void __user *buffer, size_t *lenp, loff_t *ppos)
2120 struct do_proc_dointvec_minmax_conv_param param = {
2121 .min = (int *) table->extra1,
2122 .max = (int *) table->extra2,
2124 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2125 do_proc_dointvec_minmax_conv, ¶m);
2128 static void validate_coredump_safety(void)
2130 #ifdef CONFIG_COREDUMP
2131 if (suid_dumpable == SUID_DUMP_ROOT &&
2132 core_pattern[0] != '/' && core_pattern[0] != '|') {
2133 printk(KERN_WARNING "Unsafe core_pattern used with "\
2134 "suid_dumpable=2. Pipe handler or fully qualified "\
2135 "core dump path required.\n");
2140 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2141 void __user *buffer, size_t *lenp, loff_t *ppos)
2143 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2145 validate_coredump_safety();
2149 #ifdef CONFIG_COREDUMP
2150 static int proc_dostring_coredump(struct ctl_table *table, int write,
2151 void __user *buffer, size_t *lenp, loff_t *ppos)
2153 int error = proc_dostring(table, write, buffer, lenp, ppos);
2155 validate_coredump_safety();
2160 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2161 void __user *buffer,
2162 size_t *lenp, loff_t *ppos,
2163 unsigned long convmul,
2164 unsigned long convdiv)
2166 unsigned long *i, *min, *max;
2167 int vleft, first = 1, err = 0;
2168 unsigned long page = 0;
2172 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2177 i = (unsigned long *) data;
2178 min = (unsigned long *) table->extra1;
2179 max = (unsigned long *) table->extra2;
2180 vleft = table->maxlen / sizeof(unsigned long);
2184 if (left > PAGE_SIZE - 1)
2185 left = PAGE_SIZE - 1;
2186 page = __get_free_page(GFP_TEMPORARY);
2187 kbuf = (char *) page;
2190 if (copy_from_user(kbuf, buffer, left)) {
2197 for (; left && vleft--; i++, first = 0) {
2203 left -= proc_skip_spaces(&kbuf);
2205 err = proc_get_long(&kbuf, &left, &val, &neg,
2207 sizeof(proc_wspace_sep), NULL);
2212 if ((min && val < *min) || (max && val > *max))
2216 val = convdiv * (*i) / convmul;
2218 err = proc_put_char(&buffer, &left, '\t');
2219 err = proc_put_long(&buffer, &left, val, false);
2225 if (!write && !first && left && !err)
2226 err = proc_put_char(&buffer, &left, '\n');
2228 left -= proc_skip_spaces(&kbuf);
2233 return err ? : -EINVAL;
2240 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2241 void __user *buffer,
2242 size_t *lenp, loff_t *ppos,
2243 unsigned long convmul,
2244 unsigned long convdiv)
2246 return __do_proc_doulongvec_minmax(table->data, table, write,
2247 buffer, lenp, ppos, convmul, convdiv);
2251 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2252 * @table: the sysctl table
2253 * @write: %TRUE if this is a write to the sysctl file
2254 * @buffer: the user buffer
2255 * @lenp: the size of the user buffer
2256 * @ppos: file position
2258 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2259 * values from/to the user buffer, treated as an ASCII string.
2261 * This routine will ensure the values are within the range specified by
2262 * table->extra1 (min) and table->extra2 (max).
2264 * Returns 0 on success.
2266 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2267 void __user *buffer, size_t *lenp, loff_t *ppos)
2269 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2273 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: file position
2280 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2281 * values from/to the user buffer, treated as an ASCII string. The values
2282 * are treated as milliseconds, and converted to jiffies when they are stored.
2284 * This routine will ensure the values are within the range specified by
2285 * table->extra1 (min) and table->extra2 (max).
2287 * Returns 0 on success.
2289 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2290 void __user *buffer,
2291 size_t *lenp, loff_t *ppos)
2293 return do_proc_doulongvec_minmax(table, write, buffer,
2294 lenp, ppos, HZ, 1000l);
2298 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2300 int write, void *data)
2303 if (*lvalp > LONG_MAX / HZ)
2305 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2311 lval = (unsigned long)-val;
2314 lval = (unsigned long)val;
2321 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2323 int write, void *data)
2326 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2328 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2334 lval = (unsigned long)-val;
2337 lval = (unsigned long)val;
2339 *lvalp = jiffies_to_clock_t(lval);
2344 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2346 int write, void *data)
2349 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2355 lval = (unsigned long)-val;
2358 lval = (unsigned long)val;
2360 *lvalp = jiffies_to_msecs(lval);
2366 * proc_dointvec_jiffies - read a vector of integers as seconds
2367 * @table: the sysctl table
2368 * @write: %TRUE if this is a write to the sysctl file
2369 * @buffer: the user buffer
2370 * @lenp: the size of the user buffer
2371 * @ppos: file position
2373 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2374 * values from/to the user buffer, treated as an ASCII string.
2375 * The values read are assumed to be in seconds, and are converted into
2378 * Returns 0 on success.
2380 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2381 void __user *buffer, size_t *lenp, loff_t *ppos)
2383 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2384 do_proc_dointvec_jiffies_conv,NULL);
2388 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2389 * @table: the sysctl table
2390 * @write: %TRUE if this is a write to the sysctl file
2391 * @buffer: the user buffer
2392 * @lenp: the size of the user buffer
2393 * @ppos: pointer to the file position
2395 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2396 * values from/to the user buffer, treated as an ASCII string.
2397 * The values read are assumed to be in 1/USER_HZ seconds, and
2398 * are converted into jiffies.
2400 * Returns 0 on success.
2402 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2403 void __user *buffer, size_t *lenp, loff_t *ppos)
2405 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2406 do_proc_dointvec_userhz_jiffies_conv,NULL);
2410 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2411 * @table: the sysctl table
2412 * @write: %TRUE if this is a write to the sysctl file
2413 * @buffer: the user buffer
2414 * @lenp: the size of the user buffer
2415 * @ppos: file position
2416 * @ppos: the current position in the file
2418 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2419 * values from/to the user buffer, treated as an ASCII string.
2420 * The values read are assumed to be in 1/1000 seconds, and
2421 * are converted into jiffies.
2423 * Returns 0 on success.
2425 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2426 void __user *buffer, size_t *lenp, loff_t *ppos)
2428 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2429 do_proc_dointvec_ms_jiffies_conv, NULL);
2432 static int proc_do_cad_pid(struct ctl_table *table, int write,
2433 void __user *buffer, size_t *lenp, loff_t *ppos)
2435 struct pid *new_pid;
2439 tmp = pid_vnr(cad_pid);
2441 r = __do_proc_dointvec(&tmp, table, write, buffer,
2442 lenp, ppos, NULL, NULL);
2446 new_pid = find_get_pid(tmp);
2450 put_pid(xchg(&cad_pid, new_pid));
2455 * proc_do_large_bitmap - read/write from/to a large bitmap
2456 * @table: the sysctl table
2457 * @write: %TRUE if this is a write to the sysctl file
2458 * @buffer: the user buffer
2459 * @lenp: the size of the user buffer
2460 * @ppos: file position
2462 * The bitmap is stored at table->data and the bitmap length (in bits)
2465 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2466 * large bitmaps may be represented in a compact manner. Writing into
2467 * the file will clear the bitmap then update it with the given input.
2469 * Returns 0 on success.
2471 int proc_do_large_bitmap(struct ctl_table *table, int write,
2472 void __user *buffer, size_t *lenp, loff_t *ppos)
2476 size_t left = *lenp;
2477 unsigned long bitmap_len = table->maxlen;
2478 unsigned long *bitmap = (unsigned long *) table->data;
2479 unsigned long *tmp_bitmap = NULL;
2480 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2482 if (!bitmap_len || !left || (*ppos && !write)) {
2488 unsigned long page = 0;
2491 if (left > PAGE_SIZE - 1)
2492 left = PAGE_SIZE - 1;
2494 page = __get_free_page(GFP_TEMPORARY);
2495 kbuf = (char *) page;
2498 if (copy_from_user(kbuf, buffer, left)) {
2504 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2510 proc_skip_char(&kbuf, &left, '\n');
2511 while (!err && left) {
2512 unsigned long val_a, val_b;
2515 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2519 if (val_a >= bitmap_len || neg) {
2531 err = proc_get_long(&kbuf, &left, &val_b,
2532 &neg, tr_b, sizeof(tr_b),
2536 if (val_b >= bitmap_len || neg ||
2547 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2549 proc_skip_char(&kbuf, &left, '\n');
2553 unsigned long bit_a, bit_b = 0;
2556 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2557 if (bit_a >= bitmap_len)
2559 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2563 err = proc_put_char(&buffer, &left, ',');
2567 err = proc_put_long(&buffer, &left, bit_a, false);
2570 if (bit_a != bit_b) {
2571 err = proc_put_char(&buffer, &left, '-');
2574 err = proc_put_long(&buffer, &left, bit_b, false);
2582 err = proc_put_char(&buffer, &left, '\n');
2588 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2590 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2602 #else /* CONFIG_PROC_SYSCTL */
2604 int proc_dostring(struct ctl_table *table, int write,
2605 void __user *buffer, size_t *lenp, loff_t *ppos)
2610 int proc_dointvec(struct ctl_table *table, int write,
2611 void __user *buffer, size_t *lenp, loff_t *ppos)
2616 int proc_dointvec_minmax(struct ctl_table *table, int write,
2617 void __user *buffer, size_t *lenp, loff_t *ppos)
2622 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2623 void __user *buffer, size_t *lenp, loff_t *ppos)
2628 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2629 void __user *buffer, size_t *lenp, loff_t *ppos)
2634 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2635 void __user *buffer, size_t *lenp, loff_t *ppos)
2640 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2641 void __user *buffer, size_t *lenp, loff_t *ppos)
2646 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2647 void __user *buffer,
2648 size_t *lenp, loff_t *ppos)
2654 #endif /* CONFIG_PROC_SYSCTL */
2657 * No sense putting this after each symbol definition, twice,
2658 * exception granted :-)
2660 EXPORT_SYMBOL(proc_dointvec);
2661 EXPORT_SYMBOL(proc_dointvec_jiffies);
2662 EXPORT_SYMBOL(proc_dointvec_minmax);
2663 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2664 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2665 EXPORT_SYMBOL(proc_dostring);
2666 EXPORT_SYMBOL(proc_doulongvec_minmax);
2667 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);