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_max_ms",
375 .data = &sysctl_numa_balancing_scan_period_max,
376 .maxlen = sizeof(unsigned int),
378 .proc_handler = proc_dointvec,
381 .procname = "numa_balancing_scan_size_mb",
382 .data = &sysctl_numa_balancing_scan_size,
383 .maxlen = sizeof(unsigned int),
385 .proc_handler = proc_dointvec,
388 .procname = "numa_balancing_settle_count",
389 .data = &sysctl_numa_balancing_settle_count,
390 .maxlen = sizeof(unsigned int),
392 .proc_handler = proc_dointvec,
395 .procname = "numa_balancing_migrate_deferred",
396 .data = &sysctl_numa_balancing_migrate_deferred,
397 .maxlen = sizeof(unsigned int),
399 .proc_handler = proc_dointvec,
401 #endif /* CONFIG_NUMA_BALANCING */
402 #endif /* CONFIG_SCHED_DEBUG */
404 .procname = "sched_rt_period_us",
405 .data = &sysctl_sched_rt_period,
406 .maxlen = sizeof(unsigned int),
408 .proc_handler = sched_rt_handler,
411 .procname = "sched_rt_runtime_us",
412 .data = &sysctl_sched_rt_runtime,
413 .maxlen = sizeof(int),
415 .proc_handler = sched_rt_handler,
418 .procname = "sched_rr_timeslice_ms",
419 .data = &sched_rr_timeslice,
420 .maxlen = sizeof(int),
422 .proc_handler = sched_rr_handler,
424 #ifdef CONFIG_SCHED_AUTOGROUP
426 .procname = "sched_autogroup_enabled",
427 .data = &sysctl_sched_autogroup_enabled,
428 .maxlen = sizeof(unsigned int),
430 .proc_handler = proc_dointvec_minmax,
435 #ifdef CONFIG_CFS_BANDWIDTH
437 .procname = "sched_cfs_bandwidth_slice_us",
438 .data = &sysctl_sched_cfs_bandwidth_slice,
439 .maxlen = sizeof(unsigned int),
441 .proc_handler = proc_dointvec_minmax,
445 #ifdef CONFIG_PROVE_LOCKING
447 .procname = "prove_locking",
448 .data = &prove_locking,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec,
454 #ifdef CONFIG_LOCK_STAT
456 .procname = "lock_stat",
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec,
465 .data = &panic_timeout,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec,
470 #ifdef CONFIG_COREDUMP
472 .procname = "core_uses_pid",
473 .data = &core_uses_pid,
474 .maxlen = sizeof(int),
476 .proc_handler = proc_dointvec,
479 .procname = "core_pattern",
480 .data = core_pattern,
481 .maxlen = CORENAME_MAX_SIZE,
483 .proc_handler = proc_dostring_coredump,
486 .procname = "core_pipe_limit",
487 .data = &core_pipe_limit,
488 .maxlen = sizeof(unsigned int),
490 .proc_handler = proc_dointvec,
493 #ifdef CONFIG_PROC_SYSCTL
495 .procname = "tainted",
496 .maxlen = sizeof(long),
498 .proc_handler = proc_taint,
501 #ifdef CONFIG_LATENCYTOP
503 .procname = "latencytop",
504 .data = &latencytop_enabled,
505 .maxlen = sizeof(int),
507 .proc_handler = proc_dointvec,
510 #ifdef CONFIG_BLK_DEV_INITRD
512 .procname = "real-root-dev",
513 .data = &real_root_dev,
514 .maxlen = sizeof(int),
516 .proc_handler = proc_dointvec,
520 .procname = "print-fatal-signals",
521 .data = &print_fatal_signals,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec,
528 .procname = "reboot-cmd",
529 .data = reboot_command,
532 .proc_handler = proc_dostring,
535 .procname = "stop-a",
536 .data = &stop_a_enabled,
537 .maxlen = sizeof (int),
539 .proc_handler = proc_dointvec,
542 .procname = "scons-poweroff",
543 .data = &scons_pwroff,
544 .maxlen = sizeof (int),
546 .proc_handler = proc_dointvec,
549 #ifdef CONFIG_SPARC64
551 .procname = "tsb-ratio",
552 .data = &sysctl_tsb_ratio,
553 .maxlen = sizeof (int),
555 .proc_handler = proc_dointvec,
560 .procname = "soft-power",
561 .data = &pwrsw_enabled,
562 .maxlen = sizeof (int),
564 .proc_handler = proc_dointvec,
567 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
569 .procname = "unaligned-trap",
570 .data = &unaligned_enabled,
571 .maxlen = sizeof (int),
573 .proc_handler = proc_dointvec,
577 .procname = "ctrl-alt-del",
579 .maxlen = sizeof(int),
581 .proc_handler = proc_dointvec,
583 #ifdef CONFIG_FUNCTION_TRACER
585 .procname = "ftrace_enabled",
586 .data = &ftrace_enabled,
587 .maxlen = sizeof(int),
589 .proc_handler = ftrace_enable_sysctl,
592 #ifdef CONFIG_STACK_TRACER
594 .procname = "stack_tracer_enabled",
595 .data = &stack_tracer_enabled,
596 .maxlen = sizeof(int),
598 .proc_handler = stack_trace_sysctl,
601 #ifdef CONFIG_TRACING
603 .procname = "ftrace_dump_on_oops",
604 .data = &ftrace_dump_on_oops,
605 .maxlen = sizeof(int),
607 .proc_handler = proc_dointvec,
610 .procname = "traceoff_on_warning",
611 .data = &__disable_trace_on_warning,
612 .maxlen = sizeof(__disable_trace_on_warning),
614 .proc_handler = proc_dointvec,
617 #ifdef CONFIG_MODULES
619 .procname = "modprobe",
620 .data = &modprobe_path,
621 .maxlen = KMOD_PATH_LEN,
623 .proc_handler = proc_dostring,
626 .procname = "modules_disabled",
627 .data = &modules_disabled,
628 .maxlen = sizeof(int),
630 /* only handle a transition from default "0" to "1" */
631 .proc_handler = proc_dointvec_minmax,
638 .procname = "hotplug",
639 .data = &uevent_helper,
640 .maxlen = UEVENT_HELPER_PATH_LEN,
642 .proc_handler = proc_dostring,
645 #ifdef CONFIG_CHR_DEV_SG
647 .procname = "sg-big-buff",
648 .data = &sg_big_buff,
649 .maxlen = sizeof (int),
651 .proc_handler = proc_dointvec,
654 #ifdef CONFIG_BSD_PROCESS_ACCT
658 .maxlen = 3*sizeof(int),
660 .proc_handler = proc_dointvec,
663 #ifdef CONFIG_MAGIC_SYSRQ
666 .data = &__sysrq_enabled,
667 .maxlen = sizeof (int),
669 .proc_handler = sysrq_sysctl_handler,
672 #ifdef CONFIG_PROC_SYSCTL
674 .procname = "cad_pid",
676 .maxlen = sizeof (int),
678 .proc_handler = proc_do_cad_pid,
682 .procname = "threads-max",
683 .data = &max_threads,
684 .maxlen = sizeof(int),
686 .proc_handler = proc_dointvec,
689 .procname = "random",
691 .child = random_table,
694 .procname = "usermodehelper",
696 .child = usermodehelper_table,
699 .procname = "overflowuid",
700 .data = &overflowuid,
701 .maxlen = sizeof(int),
703 .proc_handler = proc_dointvec_minmax,
704 .extra1 = &minolduid,
705 .extra2 = &maxolduid,
708 .procname = "overflowgid",
709 .data = &overflowgid,
710 .maxlen = sizeof(int),
712 .proc_handler = proc_dointvec_minmax,
713 .extra1 = &minolduid,
714 .extra2 = &maxolduid,
717 #ifdef CONFIG_MATHEMU
719 .procname = "ieee_emulation_warnings",
720 .data = &sysctl_ieee_emulation_warnings,
721 .maxlen = sizeof(int),
723 .proc_handler = proc_dointvec,
727 .procname = "userprocess_debug",
728 .data = &show_unhandled_signals,
729 .maxlen = sizeof(int),
731 .proc_handler = proc_dointvec,
735 .procname = "pid_max",
737 .maxlen = sizeof (int),
739 .proc_handler = proc_dointvec_minmax,
740 .extra1 = &pid_max_min,
741 .extra2 = &pid_max_max,
744 .procname = "panic_on_oops",
745 .data = &panic_on_oops,
746 .maxlen = sizeof(int),
748 .proc_handler = proc_dointvec,
750 #if defined CONFIG_PRINTK
752 .procname = "printk",
753 .data = &console_loglevel,
754 .maxlen = 4*sizeof(int),
756 .proc_handler = proc_dointvec,
759 .procname = "printk_ratelimit",
760 .data = &printk_ratelimit_state.interval,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec_jiffies,
766 .procname = "printk_ratelimit_burst",
767 .data = &printk_ratelimit_state.burst,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec,
773 .procname = "printk_delay",
774 .data = &printk_delay_msec,
775 .maxlen = sizeof(int),
777 .proc_handler = proc_dointvec_minmax,
779 .extra2 = &ten_thousand,
782 .procname = "dmesg_restrict",
783 .data = &dmesg_restrict,
784 .maxlen = sizeof(int),
786 .proc_handler = proc_dointvec_minmax_sysadmin,
791 .procname = "kptr_restrict",
792 .data = &kptr_restrict,
793 .maxlen = sizeof(int),
795 .proc_handler = proc_dointvec_minmax_sysadmin,
801 .procname = "ngroups_max",
802 .data = &ngroups_max,
803 .maxlen = sizeof (int),
805 .proc_handler = proc_dointvec,
808 .procname = "cap_last_cap",
809 .data = (void *)&cap_last_cap,
810 .maxlen = sizeof(int),
812 .proc_handler = proc_dointvec,
814 #if defined(CONFIG_LOCKUP_DETECTOR)
816 .procname = "watchdog",
817 .data = &watchdog_user_enabled,
818 .maxlen = sizeof (int),
820 .proc_handler = proc_dowatchdog,
825 .procname = "watchdog_thresh",
826 .data = &watchdog_thresh,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dowatchdog,
834 .procname = "softlockup_panic",
835 .data = &softlockup_panic,
836 .maxlen = sizeof(int),
838 .proc_handler = proc_dointvec_minmax,
843 .procname = "nmi_watchdog",
844 .data = &watchdog_user_enabled,
845 .maxlen = sizeof (int),
847 .proc_handler = proc_dowatchdog,
852 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
854 .procname = "unknown_nmi_panic",
855 .data = &unknown_nmi_panic,
856 .maxlen = sizeof (int),
858 .proc_handler = proc_dointvec,
861 #if defined(CONFIG_X86)
863 .procname = "panic_on_unrecovered_nmi",
864 .data = &panic_on_unrecovered_nmi,
865 .maxlen = sizeof(int),
867 .proc_handler = proc_dointvec,
870 .procname = "panic_on_io_nmi",
871 .data = &panic_on_io_nmi,
872 .maxlen = sizeof(int),
874 .proc_handler = proc_dointvec,
876 #ifdef CONFIG_DEBUG_STACKOVERFLOW
878 .procname = "panic_on_stackoverflow",
879 .data = &sysctl_panic_on_stackoverflow,
880 .maxlen = sizeof(int),
882 .proc_handler = proc_dointvec,
886 .procname = "bootloader_type",
887 .data = &bootloader_type,
888 .maxlen = sizeof (int),
890 .proc_handler = proc_dointvec,
893 .procname = "bootloader_version",
894 .data = &bootloader_version,
895 .maxlen = sizeof (int),
897 .proc_handler = proc_dointvec,
900 .procname = "kstack_depth_to_print",
901 .data = &kstack_depth_to_print,
902 .maxlen = sizeof(int),
904 .proc_handler = proc_dointvec,
907 .procname = "io_delay_type",
908 .data = &io_delay_type,
909 .maxlen = sizeof(int),
911 .proc_handler = proc_dointvec,
914 #if defined(CONFIG_MMU)
916 .procname = "randomize_va_space",
917 .data = &randomize_va_space,
918 .maxlen = sizeof(int),
920 .proc_handler = proc_dointvec,
923 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
925 .procname = "spin_retry",
927 .maxlen = sizeof (int),
929 .proc_handler = proc_dointvec,
932 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
934 .procname = "acpi_video_flags",
935 .data = &acpi_realmode_flags,
936 .maxlen = sizeof (unsigned long),
938 .proc_handler = proc_doulongvec_minmax,
941 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
943 .procname = "ignore-unaligned-usertrap",
944 .data = &no_unaligned_warning,
945 .maxlen = sizeof (int),
947 .proc_handler = proc_dointvec,
952 .procname = "unaligned-dump-stack",
953 .data = &unaligned_dump_stack,
954 .maxlen = sizeof (int),
956 .proc_handler = proc_dointvec,
959 #ifdef CONFIG_DETECT_HUNG_TASK
961 .procname = "hung_task_panic",
962 .data = &sysctl_hung_task_panic,
963 .maxlen = sizeof(int),
965 .proc_handler = proc_dointvec_minmax,
970 .procname = "hung_task_check_count",
971 .data = &sysctl_hung_task_check_count,
972 .maxlen = sizeof(unsigned long),
974 .proc_handler = proc_doulongvec_minmax,
977 .procname = "hung_task_timeout_secs",
978 .data = &sysctl_hung_task_timeout_secs,
979 .maxlen = sizeof(unsigned long),
981 .proc_handler = proc_dohung_task_timeout_secs,
984 .procname = "hung_task_warnings",
985 .data = &sysctl_hung_task_warnings,
986 .maxlen = sizeof(unsigned long),
988 .proc_handler = proc_doulongvec_minmax,
993 .procname = "compat-log",
995 .maxlen = sizeof (int),
997 .proc_handler = proc_dointvec,
1000 #ifdef CONFIG_RT_MUTEXES
1002 .procname = "max_lock_depth",
1003 .data = &max_lock_depth,
1004 .maxlen = sizeof(int),
1006 .proc_handler = proc_dointvec,
1010 .procname = "poweroff_cmd",
1011 .data = &poweroff_cmd,
1012 .maxlen = POWEROFF_CMD_PATH_LEN,
1014 .proc_handler = proc_dostring,
1020 .child = key_sysctls,
1023 #ifdef CONFIG_RCU_TORTURE_TEST
1025 .procname = "rcutorture_runnable",
1026 .data = &rcutorture_runnable,
1027 .maxlen = sizeof(int),
1029 .proc_handler = proc_dointvec,
1032 #ifdef CONFIG_PERF_EVENTS
1034 * User-space scripts rely on the existence of this file
1035 * as a feature check for perf_events being enabled.
1037 * So it's an ABI, do not remove!
1040 .procname = "perf_event_paranoid",
1041 .data = &sysctl_perf_event_paranoid,
1042 .maxlen = sizeof(sysctl_perf_event_paranoid),
1044 .proc_handler = proc_dointvec,
1047 .procname = "perf_event_mlock_kb",
1048 .data = &sysctl_perf_event_mlock,
1049 .maxlen = sizeof(sysctl_perf_event_mlock),
1051 .proc_handler = proc_dointvec,
1054 .procname = "perf_event_max_sample_rate",
1055 .data = &sysctl_perf_event_sample_rate,
1056 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1058 .proc_handler = perf_proc_update_handler,
1061 .procname = "perf_cpu_time_max_percent",
1062 .data = &sysctl_perf_cpu_time_max_percent,
1063 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1065 .proc_handler = perf_cpu_time_max_percent_handler,
1067 .extra2 = &one_hundred,
1070 #ifdef CONFIG_KMEMCHECK
1072 .procname = "kmemcheck",
1073 .data = &kmemcheck_enabled,
1074 .maxlen = sizeof(int),
1076 .proc_handler = proc_dointvec,
1081 .procname = "blk_iopoll",
1082 .data = &blk_iopoll_enabled,
1083 .maxlen = sizeof(int),
1085 .proc_handler = proc_dointvec,
1091 static struct ctl_table vm_table[] = {
1093 .procname = "overcommit_memory",
1094 .data = &sysctl_overcommit_memory,
1095 .maxlen = sizeof(sysctl_overcommit_memory),
1097 .proc_handler = proc_dointvec_minmax,
1102 .procname = "panic_on_oom",
1103 .data = &sysctl_panic_on_oom,
1104 .maxlen = sizeof(sysctl_panic_on_oom),
1106 .proc_handler = proc_dointvec_minmax,
1111 .procname = "oom_kill_allocating_task",
1112 .data = &sysctl_oom_kill_allocating_task,
1113 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1115 .proc_handler = proc_dointvec,
1118 .procname = "oom_dump_tasks",
1119 .data = &sysctl_oom_dump_tasks,
1120 .maxlen = sizeof(sysctl_oom_dump_tasks),
1122 .proc_handler = proc_dointvec,
1125 .procname = "overcommit_ratio",
1126 .data = &sysctl_overcommit_ratio,
1127 .maxlen = sizeof(sysctl_overcommit_ratio),
1129 .proc_handler = proc_dointvec,
1132 .procname = "page-cluster",
1133 .data = &page_cluster,
1134 .maxlen = sizeof(int),
1136 .proc_handler = proc_dointvec_minmax,
1140 .procname = "dirty_background_ratio",
1141 .data = &dirty_background_ratio,
1142 .maxlen = sizeof(dirty_background_ratio),
1144 .proc_handler = dirty_background_ratio_handler,
1146 .extra2 = &one_hundred,
1149 .procname = "dirty_background_bytes",
1150 .data = &dirty_background_bytes,
1151 .maxlen = sizeof(dirty_background_bytes),
1153 .proc_handler = dirty_background_bytes_handler,
1157 .procname = "dirty_ratio",
1158 .data = &vm_dirty_ratio,
1159 .maxlen = sizeof(vm_dirty_ratio),
1161 .proc_handler = dirty_ratio_handler,
1163 .extra2 = &one_hundred,
1166 .procname = "dirty_bytes",
1167 .data = &vm_dirty_bytes,
1168 .maxlen = sizeof(vm_dirty_bytes),
1170 .proc_handler = dirty_bytes_handler,
1171 .extra1 = &dirty_bytes_min,
1174 .procname = "dirty_writeback_centisecs",
1175 .data = &dirty_writeback_interval,
1176 .maxlen = sizeof(dirty_writeback_interval),
1178 .proc_handler = dirty_writeback_centisecs_handler,
1181 .procname = "dirty_expire_centisecs",
1182 .data = &dirty_expire_interval,
1183 .maxlen = sizeof(dirty_expire_interval),
1185 .proc_handler = proc_dointvec_minmax,
1189 .procname = "nr_pdflush_threads",
1190 .mode = 0444 /* read-only */,
1191 .proc_handler = pdflush_proc_obsolete,
1194 .procname = "swappiness",
1195 .data = &vm_swappiness,
1196 .maxlen = sizeof(vm_swappiness),
1198 .proc_handler = proc_dointvec_minmax,
1200 .extra2 = &one_hundred,
1202 #ifdef CONFIG_HUGETLB_PAGE
1204 .procname = "nr_hugepages",
1206 .maxlen = sizeof(unsigned long),
1208 .proc_handler = hugetlb_sysctl_handler,
1209 .extra1 = (void *)&hugetlb_zero,
1210 .extra2 = (void *)&hugetlb_infinity,
1214 .procname = "nr_hugepages_mempolicy",
1216 .maxlen = sizeof(unsigned long),
1218 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1219 .extra1 = (void *)&hugetlb_zero,
1220 .extra2 = (void *)&hugetlb_infinity,
1224 .procname = "hugetlb_shm_group",
1225 .data = &sysctl_hugetlb_shm_group,
1226 .maxlen = sizeof(gid_t),
1228 .proc_handler = proc_dointvec,
1231 .procname = "hugepages_treat_as_movable",
1232 .data = &hugepages_treat_as_movable,
1233 .maxlen = sizeof(int),
1235 .proc_handler = proc_dointvec,
1238 .procname = "nr_overcommit_hugepages",
1240 .maxlen = sizeof(unsigned long),
1242 .proc_handler = hugetlb_overcommit_handler,
1243 .extra1 = (void *)&hugetlb_zero,
1244 .extra2 = (void *)&hugetlb_infinity,
1248 .procname = "lowmem_reserve_ratio",
1249 .data = &sysctl_lowmem_reserve_ratio,
1250 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1252 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1255 .procname = "drop_caches",
1256 .data = &sysctl_drop_caches,
1257 .maxlen = sizeof(int),
1259 .proc_handler = drop_caches_sysctl_handler,
1263 #ifdef CONFIG_COMPACTION
1265 .procname = "compact_memory",
1266 .data = &sysctl_compact_memory,
1267 .maxlen = sizeof(int),
1269 .proc_handler = sysctl_compaction_handler,
1272 .procname = "extfrag_threshold",
1273 .data = &sysctl_extfrag_threshold,
1274 .maxlen = sizeof(int),
1276 .proc_handler = sysctl_extfrag_handler,
1277 .extra1 = &min_extfrag_threshold,
1278 .extra2 = &max_extfrag_threshold,
1281 #endif /* CONFIG_COMPACTION */
1283 .procname = "min_free_kbytes",
1284 .data = &min_free_kbytes,
1285 .maxlen = sizeof(min_free_kbytes),
1287 .proc_handler = min_free_kbytes_sysctl_handler,
1291 .procname = "percpu_pagelist_fraction",
1292 .data = &percpu_pagelist_fraction,
1293 .maxlen = sizeof(percpu_pagelist_fraction),
1295 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1296 .extra1 = &min_percpu_pagelist_fract,
1300 .procname = "max_map_count",
1301 .data = &sysctl_max_map_count,
1302 .maxlen = sizeof(sysctl_max_map_count),
1304 .proc_handler = proc_dointvec_minmax,
1309 .procname = "nr_trim_pages",
1310 .data = &sysctl_nr_trim_pages,
1311 .maxlen = sizeof(sysctl_nr_trim_pages),
1313 .proc_handler = proc_dointvec_minmax,
1318 .procname = "laptop_mode",
1319 .data = &laptop_mode,
1320 .maxlen = sizeof(laptop_mode),
1322 .proc_handler = proc_dointvec_jiffies,
1325 .procname = "block_dump",
1326 .data = &block_dump,
1327 .maxlen = sizeof(block_dump),
1329 .proc_handler = proc_dointvec,
1333 .procname = "vfs_cache_pressure",
1334 .data = &sysctl_vfs_cache_pressure,
1335 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1337 .proc_handler = proc_dointvec,
1340 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1342 .procname = "legacy_va_layout",
1343 .data = &sysctl_legacy_va_layout,
1344 .maxlen = sizeof(sysctl_legacy_va_layout),
1346 .proc_handler = proc_dointvec,
1352 .procname = "zone_reclaim_mode",
1353 .data = &zone_reclaim_mode,
1354 .maxlen = sizeof(zone_reclaim_mode),
1356 .proc_handler = proc_dointvec,
1360 .procname = "min_unmapped_ratio",
1361 .data = &sysctl_min_unmapped_ratio,
1362 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1364 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1366 .extra2 = &one_hundred,
1369 .procname = "min_slab_ratio",
1370 .data = &sysctl_min_slab_ratio,
1371 .maxlen = sizeof(sysctl_min_slab_ratio),
1373 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1375 .extra2 = &one_hundred,
1380 .procname = "stat_interval",
1381 .data = &sysctl_stat_interval,
1382 .maxlen = sizeof(sysctl_stat_interval),
1384 .proc_handler = proc_dointvec_jiffies,
1389 .procname = "mmap_min_addr",
1390 .data = &dac_mmap_min_addr,
1391 .maxlen = sizeof(unsigned long),
1393 .proc_handler = mmap_min_addr_handler,
1398 .procname = "numa_zonelist_order",
1399 .data = &numa_zonelist_order,
1400 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1402 .proc_handler = numa_zonelist_order_handler,
1405 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1406 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1408 .procname = "vdso_enabled",
1409 .data = &vdso_enabled,
1410 .maxlen = sizeof(vdso_enabled),
1412 .proc_handler = proc_dointvec,
1416 #ifdef CONFIG_HIGHMEM
1418 .procname = "highmem_is_dirtyable",
1419 .data = &vm_highmem_is_dirtyable,
1420 .maxlen = sizeof(vm_highmem_is_dirtyable),
1422 .proc_handler = proc_dointvec_minmax,
1428 .procname = "scan_unevictable_pages",
1429 .data = &scan_unevictable_pages,
1430 .maxlen = sizeof(scan_unevictable_pages),
1432 .proc_handler = scan_unevictable_handler,
1434 #ifdef CONFIG_MEMORY_FAILURE
1436 .procname = "memory_failure_early_kill",
1437 .data = &sysctl_memory_failure_early_kill,
1438 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1440 .proc_handler = proc_dointvec_minmax,
1445 .procname = "memory_failure_recovery",
1446 .data = &sysctl_memory_failure_recovery,
1447 .maxlen = sizeof(sysctl_memory_failure_recovery),
1449 .proc_handler = proc_dointvec_minmax,
1455 .procname = "user_reserve_kbytes",
1456 .data = &sysctl_user_reserve_kbytes,
1457 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1459 .proc_handler = proc_doulongvec_minmax,
1462 .procname = "admin_reserve_kbytes",
1463 .data = &sysctl_admin_reserve_kbytes,
1464 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1466 .proc_handler = proc_doulongvec_minmax,
1471 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1472 static struct ctl_table binfmt_misc_table[] = {
1477 static struct ctl_table fs_table[] = {
1479 .procname = "inode-nr",
1480 .data = &inodes_stat,
1481 .maxlen = 2*sizeof(long),
1483 .proc_handler = proc_nr_inodes,
1486 .procname = "inode-state",
1487 .data = &inodes_stat,
1488 .maxlen = 7*sizeof(long),
1490 .proc_handler = proc_nr_inodes,
1493 .procname = "file-nr",
1494 .data = &files_stat,
1495 .maxlen = sizeof(files_stat),
1497 .proc_handler = proc_nr_files,
1500 .procname = "file-max",
1501 .data = &files_stat.max_files,
1502 .maxlen = sizeof(files_stat.max_files),
1504 .proc_handler = proc_doulongvec_minmax,
1507 .procname = "nr_open",
1508 .data = &sysctl_nr_open,
1509 .maxlen = sizeof(int),
1511 .proc_handler = proc_dointvec_minmax,
1512 .extra1 = &sysctl_nr_open_min,
1513 .extra2 = &sysctl_nr_open_max,
1516 .procname = "dentry-state",
1517 .data = &dentry_stat,
1518 .maxlen = 6*sizeof(long),
1520 .proc_handler = proc_nr_dentry,
1523 .procname = "overflowuid",
1524 .data = &fs_overflowuid,
1525 .maxlen = sizeof(int),
1527 .proc_handler = proc_dointvec_minmax,
1528 .extra1 = &minolduid,
1529 .extra2 = &maxolduid,
1532 .procname = "overflowgid",
1533 .data = &fs_overflowgid,
1534 .maxlen = sizeof(int),
1536 .proc_handler = proc_dointvec_minmax,
1537 .extra1 = &minolduid,
1538 .extra2 = &maxolduid,
1540 #ifdef CONFIG_FILE_LOCKING
1542 .procname = "leases-enable",
1543 .data = &leases_enable,
1544 .maxlen = sizeof(int),
1546 .proc_handler = proc_dointvec,
1549 #ifdef CONFIG_DNOTIFY
1551 .procname = "dir-notify-enable",
1552 .data = &dir_notify_enable,
1553 .maxlen = sizeof(int),
1555 .proc_handler = proc_dointvec,
1559 #ifdef CONFIG_FILE_LOCKING
1561 .procname = "lease-break-time",
1562 .data = &lease_break_time,
1563 .maxlen = sizeof(int),
1565 .proc_handler = proc_dointvec,
1570 .procname = "aio-nr",
1572 .maxlen = sizeof(aio_nr),
1574 .proc_handler = proc_doulongvec_minmax,
1577 .procname = "aio-max-nr",
1578 .data = &aio_max_nr,
1579 .maxlen = sizeof(aio_max_nr),
1581 .proc_handler = proc_doulongvec_minmax,
1583 #endif /* CONFIG_AIO */
1584 #ifdef CONFIG_INOTIFY_USER
1586 .procname = "inotify",
1588 .child = inotify_table,
1593 .procname = "epoll",
1595 .child = epoll_table,
1600 .procname = "protected_symlinks",
1601 .data = &sysctl_protected_symlinks,
1602 .maxlen = sizeof(int),
1604 .proc_handler = proc_dointvec_minmax,
1609 .procname = "protected_hardlinks",
1610 .data = &sysctl_protected_hardlinks,
1611 .maxlen = sizeof(int),
1613 .proc_handler = proc_dointvec_minmax,
1618 .procname = "suid_dumpable",
1619 .data = &suid_dumpable,
1620 .maxlen = sizeof(int),
1622 .proc_handler = proc_dointvec_minmax_coredump,
1626 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1628 .procname = "binfmt_misc",
1630 .child = binfmt_misc_table,
1634 .procname = "pipe-max-size",
1635 .data = &pipe_max_size,
1636 .maxlen = sizeof(int),
1638 .proc_handler = &pipe_proc_fn,
1639 .extra1 = &pipe_min_size,
1644 static struct ctl_table debug_table[] = {
1645 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1647 .procname = "exception-trace",
1648 .data = &show_unhandled_signals,
1649 .maxlen = sizeof(int),
1651 .proc_handler = proc_dointvec
1654 #if defined(CONFIG_OPTPROBES)
1656 .procname = "kprobes-optimization",
1657 .data = &sysctl_kprobes_optimization,
1658 .maxlen = sizeof(int),
1660 .proc_handler = proc_kprobes_optimization_handler,
1668 static struct ctl_table dev_table[] = {
1672 int __init sysctl_init(void)
1674 struct ctl_table_header *hdr;
1676 hdr = register_sysctl_table(sysctl_base_table);
1677 kmemleak_not_leak(hdr);
1681 #endif /* CONFIG_SYSCTL */
1687 #ifdef CONFIG_PROC_SYSCTL
1689 static int _proc_do_string(void* data, int maxlen, int write,
1690 void __user *buffer,
1691 size_t *lenp, loff_t *ppos)
1697 if (!data || !maxlen || !*lenp) {
1705 while (len < *lenp) {
1706 if (get_user(c, p++))
1708 if (c == 0 || c == '\n')
1714 if(copy_from_user(data, buffer, len))
1716 ((char *) data)[len] = 0;
1734 if(copy_to_user(buffer, data, len))
1737 if(put_user('\n', ((char __user *) buffer) + len))
1748 * proc_dostring - read a string sysctl
1749 * @table: the sysctl table
1750 * @write: %TRUE if this is a write to the sysctl file
1751 * @buffer: the user buffer
1752 * @lenp: the size of the user buffer
1753 * @ppos: file position
1755 * Reads/writes a string from/to the user buffer. If the kernel
1756 * buffer provided is not large enough to hold the string, the
1757 * string is truncated. The copied string is %NULL-terminated.
1758 * If the string is being read by the user process, it is copied
1759 * and a newline '\n' is added. It is truncated if the buffer is
1762 * Returns 0 on success.
1764 int proc_dostring(struct ctl_table *table, int write,
1765 void __user *buffer, size_t *lenp, loff_t *ppos)
1767 return _proc_do_string(table->data, table->maxlen, write,
1768 buffer, lenp, ppos);
1771 static size_t proc_skip_spaces(char **buf)
1774 char *tmp = skip_spaces(*buf);
1780 static void proc_skip_char(char **buf, size_t *size, const char v)
1790 #define TMPBUFLEN 22
1792 * proc_get_long - reads an ASCII formatted integer from a user buffer
1794 * @buf: a kernel buffer
1795 * @size: size of the kernel buffer
1796 * @val: this is where the number will be stored
1797 * @neg: set to %TRUE if number is negative
1798 * @perm_tr: a vector which contains the allowed trailers
1799 * @perm_tr_len: size of the perm_tr vector
1800 * @tr: pointer to store the trailer character
1802 * In case of success %0 is returned and @buf and @size are updated with
1803 * the amount of bytes read. If @tr is non-NULL and a trailing
1804 * character exists (size is non-zero after returning from this
1805 * function), @tr is updated with the trailing character.
1807 static int proc_get_long(char **buf, size_t *size,
1808 unsigned long *val, bool *neg,
1809 const char *perm_tr, unsigned perm_tr_len, char *tr)
1812 char *p, tmp[TMPBUFLEN];
1818 if (len > TMPBUFLEN - 1)
1819 len = TMPBUFLEN - 1;
1821 memcpy(tmp, *buf, len);
1825 if (*p == '-' && *size > 1) {
1833 *val = simple_strtoul(p, &p, 0);
1837 /* We don't know if the next char is whitespace thus we may accept
1838 * invalid integers (e.g. 1234...a) or two integers instead of one
1839 * (e.g. 123...1). So lets not allow such large numbers. */
1840 if (len == TMPBUFLEN - 1)
1843 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1846 if (tr && (len < *size))
1856 * proc_put_long - converts an integer to a decimal ASCII formatted string
1858 * @buf: the user buffer
1859 * @size: the size of the user buffer
1860 * @val: the integer to be converted
1861 * @neg: sign of the number, %TRUE for negative
1863 * In case of success %0 is returned and @buf and @size are updated with
1864 * the amount of bytes written.
1866 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1870 char tmp[TMPBUFLEN], *p = tmp;
1872 sprintf(p, "%s%lu", neg ? "-" : "", val);
1876 if (copy_to_user(*buf, tmp, len))
1884 static int proc_put_char(void __user **buf, size_t *size, char c)
1887 char __user **buffer = (char __user **)buf;
1888 if (put_user(c, *buffer))
1890 (*size)--, (*buffer)++;
1896 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1898 int write, void *data)
1901 *valp = *negp ? -*lvalp : *lvalp;
1906 *lvalp = (unsigned long)-val;
1909 *lvalp = (unsigned long)val;
1915 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1917 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1918 int write, void __user *buffer,
1919 size_t *lenp, loff_t *ppos,
1920 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1921 int write, void *data),
1924 int *i, vleft, first = 1, err = 0;
1925 unsigned long page = 0;
1929 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1934 i = (int *) tbl_data;
1935 vleft = table->maxlen / sizeof(*i);
1939 conv = do_proc_dointvec_conv;
1942 if (left > PAGE_SIZE - 1)
1943 left = PAGE_SIZE - 1;
1944 page = __get_free_page(GFP_TEMPORARY);
1945 kbuf = (char *) page;
1948 if (copy_from_user(kbuf, buffer, left)) {
1955 for (; left && vleft--; i++, first=0) {
1960 left -= proc_skip_spaces(&kbuf);
1964 err = proc_get_long(&kbuf, &left, &lval, &neg,
1966 sizeof(proc_wspace_sep), NULL);
1969 if (conv(&neg, &lval, i, 1, data)) {
1974 if (conv(&neg, &lval, i, 0, data)) {
1979 err = proc_put_char(&buffer, &left, '\t');
1982 err = proc_put_long(&buffer, &left, lval, neg);
1988 if (!write && !first && left && !err)
1989 err = proc_put_char(&buffer, &left, '\n');
1990 if (write && !err && left)
1991 left -= proc_skip_spaces(&kbuf);
1996 return err ? : -EINVAL;
2003 static int do_proc_dointvec(struct ctl_table *table, int write,
2004 void __user *buffer, size_t *lenp, loff_t *ppos,
2005 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2006 int write, void *data),
2009 return __do_proc_dointvec(table->data, table, write,
2010 buffer, lenp, ppos, conv, data);
2014 * proc_dointvec - read a vector of integers
2015 * @table: the sysctl table
2016 * @write: %TRUE if this is a write to the sysctl file
2017 * @buffer: the user buffer
2018 * @lenp: the size of the user buffer
2019 * @ppos: file position
2021 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2022 * values from/to the user buffer, treated as an ASCII string.
2024 * Returns 0 on success.
2026 int proc_dointvec(struct ctl_table *table, int write,
2027 void __user *buffer, size_t *lenp, loff_t *ppos)
2029 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2034 * Taint values can only be increased
2035 * This means we can safely use a temporary.
2037 static int proc_taint(struct ctl_table *table, int write,
2038 void __user *buffer, size_t *lenp, loff_t *ppos)
2041 unsigned long tmptaint = get_taint();
2044 if (write && !capable(CAP_SYS_ADMIN))
2049 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2055 * Poor man's atomic or. Not worth adding a primitive
2056 * to everyone's atomic.h for this
2059 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2060 if ((tmptaint >> i) & 1)
2061 add_taint(i, LOCKDEP_STILL_OK);
2068 #ifdef CONFIG_PRINTK
2069 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2070 void __user *buffer, size_t *lenp, loff_t *ppos)
2072 if (write && !capable(CAP_SYS_ADMIN))
2075 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2079 struct do_proc_dointvec_minmax_conv_param {
2084 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2086 int write, void *data)
2088 struct do_proc_dointvec_minmax_conv_param *param = data;
2090 int val = *negp ? -*lvalp : *lvalp;
2091 if ((param->min && *param->min > val) ||
2092 (param->max && *param->max < val))
2099 *lvalp = (unsigned long)-val;
2102 *lvalp = (unsigned long)val;
2109 * proc_dointvec_minmax - read a vector of integers with min/max values
2110 * @table: the sysctl table
2111 * @write: %TRUE if this is a write to the sysctl file
2112 * @buffer: the user buffer
2113 * @lenp: the size of the user buffer
2114 * @ppos: file position
2116 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2117 * values from/to the user buffer, treated as an ASCII string.
2119 * This routine will ensure the values are within the range specified by
2120 * table->extra1 (min) and table->extra2 (max).
2122 * Returns 0 on success.
2124 int proc_dointvec_minmax(struct ctl_table *table, int write,
2125 void __user *buffer, size_t *lenp, loff_t *ppos)
2127 struct do_proc_dointvec_minmax_conv_param param = {
2128 .min = (int *) table->extra1,
2129 .max = (int *) table->extra2,
2131 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2132 do_proc_dointvec_minmax_conv, ¶m);
2135 static void validate_coredump_safety(void)
2137 #ifdef CONFIG_COREDUMP
2138 if (suid_dumpable == SUID_DUMP_ROOT &&
2139 core_pattern[0] != '/' && core_pattern[0] != '|') {
2140 printk(KERN_WARNING "Unsafe core_pattern used with "\
2141 "suid_dumpable=2. Pipe handler or fully qualified "\
2142 "core dump path required.\n");
2147 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2148 void __user *buffer, size_t *lenp, loff_t *ppos)
2150 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2152 validate_coredump_safety();
2156 #ifdef CONFIG_COREDUMP
2157 static int proc_dostring_coredump(struct ctl_table *table, int write,
2158 void __user *buffer, size_t *lenp, loff_t *ppos)
2160 int error = proc_dostring(table, write, buffer, lenp, ppos);
2162 validate_coredump_safety();
2167 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2168 void __user *buffer,
2169 size_t *lenp, loff_t *ppos,
2170 unsigned long convmul,
2171 unsigned long convdiv)
2173 unsigned long *i, *min, *max;
2174 int vleft, first = 1, err = 0;
2175 unsigned long page = 0;
2179 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2184 i = (unsigned long *) data;
2185 min = (unsigned long *) table->extra1;
2186 max = (unsigned long *) table->extra2;
2187 vleft = table->maxlen / sizeof(unsigned long);
2191 if (left > PAGE_SIZE - 1)
2192 left = PAGE_SIZE - 1;
2193 page = __get_free_page(GFP_TEMPORARY);
2194 kbuf = (char *) page;
2197 if (copy_from_user(kbuf, buffer, left)) {
2204 for (; left && vleft--; i++, first = 0) {
2210 left -= proc_skip_spaces(&kbuf);
2212 err = proc_get_long(&kbuf, &left, &val, &neg,
2214 sizeof(proc_wspace_sep), NULL);
2219 if ((min && val < *min) || (max && val > *max))
2223 val = convdiv * (*i) / convmul;
2225 err = proc_put_char(&buffer, &left, '\t');
2226 err = proc_put_long(&buffer, &left, val, false);
2232 if (!write && !first && left && !err)
2233 err = proc_put_char(&buffer, &left, '\n');
2235 left -= proc_skip_spaces(&kbuf);
2240 return err ? : -EINVAL;
2247 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2248 void __user *buffer,
2249 size_t *lenp, loff_t *ppos,
2250 unsigned long convmul,
2251 unsigned long convdiv)
2253 return __do_proc_doulongvec_minmax(table->data, table, write,
2254 buffer, lenp, ppos, convmul, convdiv);
2258 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2259 * @table: the sysctl table
2260 * @write: %TRUE if this is a write to the sysctl file
2261 * @buffer: the user buffer
2262 * @lenp: the size of the user buffer
2263 * @ppos: file position
2265 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2266 * values from/to the user buffer, treated as an ASCII string.
2268 * This routine will ensure the values are within the range specified by
2269 * table->extra1 (min) and table->extra2 (max).
2271 * Returns 0 on success.
2273 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2274 void __user *buffer, size_t *lenp, loff_t *ppos)
2276 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2280 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2281 * @table: the sysctl table
2282 * @write: %TRUE if this is a write to the sysctl file
2283 * @buffer: the user buffer
2284 * @lenp: the size of the user buffer
2285 * @ppos: file position
2287 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2288 * values from/to the user buffer, treated as an ASCII string. The values
2289 * are treated as milliseconds, and converted to jiffies when they are stored.
2291 * This routine will ensure the values are within the range specified by
2292 * table->extra1 (min) and table->extra2 (max).
2294 * Returns 0 on success.
2296 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2297 void __user *buffer,
2298 size_t *lenp, loff_t *ppos)
2300 return do_proc_doulongvec_minmax(table, write, buffer,
2301 lenp, ppos, HZ, 1000l);
2305 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2307 int write, void *data)
2310 if (*lvalp > LONG_MAX / HZ)
2312 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2318 lval = (unsigned long)-val;
2321 lval = (unsigned long)val;
2328 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2330 int write, void *data)
2333 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2335 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2341 lval = (unsigned long)-val;
2344 lval = (unsigned long)val;
2346 *lvalp = jiffies_to_clock_t(lval);
2351 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2353 int write, void *data)
2356 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2366 lval = (unsigned long)-val;
2369 lval = (unsigned long)val;
2371 *lvalp = jiffies_to_msecs(lval);
2377 * proc_dointvec_jiffies - read a vector of integers as seconds
2378 * @table: the sysctl table
2379 * @write: %TRUE if this is a write to the sysctl file
2380 * @buffer: the user buffer
2381 * @lenp: the size of the user buffer
2382 * @ppos: file position
2384 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2385 * values from/to the user buffer, treated as an ASCII string.
2386 * The values read are assumed to be in seconds, and are converted into
2389 * Returns 0 on success.
2391 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2392 void __user *buffer, size_t *lenp, loff_t *ppos)
2394 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2395 do_proc_dointvec_jiffies_conv,NULL);
2399 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2400 * @table: the sysctl table
2401 * @write: %TRUE if this is a write to the sysctl file
2402 * @buffer: the user buffer
2403 * @lenp: the size of the user buffer
2404 * @ppos: pointer to the file position
2406 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2407 * values from/to the user buffer, treated as an ASCII string.
2408 * The values read are assumed to be in 1/USER_HZ seconds, and
2409 * are converted into jiffies.
2411 * Returns 0 on success.
2413 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2414 void __user *buffer, size_t *lenp, loff_t *ppos)
2416 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2417 do_proc_dointvec_userhz_jiffies_conv,NULL);
2421 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2422 * @table: the sysctl table
2423 * @write: %TRUE if this is a write to the sysctl file
2424 * @buffer: the user buffer
2425 * @lenp: the size of the user buffer
2426 * @ppos: file position
2427 * @ppos: the current position in the file
2429 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2430 * values from/to the user buffer, treated as an ASCII string.
2431 * The values read are assumed to be in 1/1000 seconds, and
2432 * are converted into jiffies.
2434 * Returns 0 on success.
2436 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2437 void __user *buffer, size_t *lenp, loff_t *ppos)
2439 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2440 do_proc_dointvec_ms_jiffies_conv, NULL);
2443 static int proc_do_cad_pid(struct ctl_table *table, int write,
2444 void __user *buffer, size_t *lenp, loff_t *ppos)
2446 struct pid *new_pid;
2450 tmp = pid_vnr(cad_pid);
2452 r = __do_proc_dointvec(&tmp, table, write, buffer,
2453 lenp, ppos, NULL, NULL);
2457 new_pid = find_get_pid(tmp);
2461 put_pid(xchg(&cad_pid, new_pid));
2466 * proc_do_large_bitmap - read/write from/to a large bitmap
2467 * @table: the sysctl table
2468 * @write: %TRUE if this is a write to the sysctl file
2469 * @buffer: the user buffer
2470 * @lenp: the size of the user buffer
2471 * @ppos: file position
2473 * The bitmap is stored at table->data and the bitmap length (in bits)
2476 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2477 * large bitmaps may be represented in a compact manner. Writing into
2478 * the file will clear the bitmap then update it with the given input.
2480 * Returns 0 on success.
2482 int proc_do_large_bitmap(struct ctl_table *table, int write,
2483 void __user *buffer, size_t *lenp, loff_t *ppos)
2487 size_t left = *lenp;
2488 unsigned long bitmap_len = table->maxlen;
2489 unsigned long *bitmap = (unsigned long *) table->data;
2490 unsigned long *tmp_bitmap = NULL;
2491 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2493 if (!bitmap_len || !left || (*ppos && !write)) {
2499 unsigned long page = 0;
2502 if (left > PAGE_SIZE - 1)
2503 left = PAGE_SIZE - 1;
2505 page = __get_free_page(GFP_TEMPORARY);
2506 kbuf = (char *) page;
2509 if (copy_from_user(kbuf, buffer, left)) {
2515 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2521 proc_skip_char(&kbuf, &left, '\n');
2522 while (!err && left) {
2523 unsigned long val_a, val_b;
2526 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2530 if (val_a >= bitmap_len || neg) {
2542 err = proc_get_long(&kbuf, &left, &val_b,
2543 &neg, tr_b, sizeof(tr_b),
2547 if (val_b >= bitmap_len || neg ||
2558 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2560 proc_skip_char(&kbuf, &left, '\n');
2564 unsigned long bit_a, bit_b = 0;
2567 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2568 if (bit_a >= bitmap_len)
2570 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2574 err = proc_put_char(&buffer, &left, ',');
2578 err = proc_put_long(&buffer, &left, bit_a, false);
2581 if (bit_a != bit_b) {
2582 err = proc_put_char(&buffer, &left, '-');
2585 err = proc_put_long(&buffer, &left, bit_b, false);
2593 err = proc_put_char(&buffer, &left, '\n');
2599 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2601 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2613 #else /* CONFIG_PROC_SYSCTL */
2615 int proc_dostring(struct ctl_table *table, int write,
2616 void __user *buffer, size_t *lenp, loff_t *ppos)
2621 int proc_dointvec(struct ctl_table *table, int write,
2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2627 int proc_dointvec_minmax(struct ctl_table *table, int write,
2628 void __user *buffer, size_t *lenp, loff_t *ppos)
2633 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2634 void __user *buffer, size_t *lenp, loff_t *ppos)
2639 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2640 void __user *buffer, size_t *lenp, loff_t *ppos)
2645 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2646 void __user *buffer, size_t *lenp, loff_t *ppos)
2651 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2652 void __user *buffer, size_t *lenp, loff_t *ppos)
2657 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2658 void __user *buffer,
2659 size_t *lenp, loff_t *ppos)
2665 #endif /* CONFIG_PROC_SYSCTL */
2668 * No sense putting this after each symbol definition, twice,
2669 * exception granted :-)
2671 EXPORT_SYMBOL(proc_dointvec);
2672 EXPORT_SYMBOL(proc_dointvec_jiffies);
2673 EXPORT_SYMBOL(proc_dointvec_minmax);
2674 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2675 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2676 EXPORT_SYMBOL(proc_dostring);
2677 EXPORT_SYMBOL(proc_doulongvec_minmax);
2678 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);