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>
65 #include <linux/kexec.h>
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
72 #include <asm/stacktrace.h>
76 #include <asm/setup.h>
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
87 #ifdef CONFIG_CHR_DEV_SG
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
96 #if defined(CONFIG_SYSCTL)
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
113 extern int sysctl_nr_trim_pages;
116 extern int blk_iopoll_enabled;
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty = 60;
124 static int __maybe_unused neg_one = -1;
127 static int __maybe_unused one = 1;
128 static int __maybe_unused two = 2;
129 static int __maybe_unused three = 3;
130 static unsigned long one_ul = 1;
131 static int one_hundred = 100;
133 static int ten_thousand = 10000;
136 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
137 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
139 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
140 static int maxolduid = 65535;
141 static int minolduid;
142 static int min_percpu_pagelist_fract = 8;
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
147 #ifdef CONFIG_INOTIFY_USER
148 #include <linux/inotify.h>
153 #ifdef CONFIG_SPARC64
154 extern int sysctl_tsb_ratio;
158 extern int pwrsw_enabled;
161 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
162 extern int unaligned_enabled;
166 extern int unaligned_dump_stack;
169 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
170 extern int no_unaligned_warning;
173 #ifdef CONFIG_PROC_SYSCTL
174 static int proc_do_cad_pid(struct ctl_table *table, int write,
175 void __user *buffer, size_t *lenp, loff_t *ppos);
176 static int proc_taint(struct ctl_table *table, int write,
177 void __user *buffer, size_t *lenp, loff_t *ppos);
181 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
185 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #ifdef CONFIG_COREDUMP
188 static int proc_dostring_coredump(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #ifdef CONFIG_MAGIC_SYSRQ
193 /* Note: sysrq code uses it's own private copy */
194 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
196 static int sysrq_sysctl_handler(ctl_table *table, int write,
197 void __user *buffer, size_t *lenp,
202 error = proc_dointvec(table, write, buffer, lenp, ppos);
207 sysrq_toggle_support(__sysrq_enabled);
214 static struct ctl_table kern_table[];
215 static struct ctl_table vm_table[];
216 static struct ctl_table fs_table[];
217 static struct ctl_table debug_table[];
218 static struct ctl_table dev_table[];
219 extern struct ctl_table random_table[];
221 extern struct ctl_table epoll_table[];
224 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
225 int sysctl_legacy_va_layout;
228 /* The default sysctl tables: */
230 static struct ctl_table sysctl_base_table[] = {
232 .procname = "kernel",
249 .child = debug_table,
259 #ifdef CONFIG_SCHED_DEBUG
260 static int min_sched_granularity_ns = 100000; /* 100 usecs */
261 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
262 static int min_wakeup_granularity_ns; /* 0 usecs */
263 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
267 #endif /* CONFIG_SMP */
268 #endif /* CONFIG_SCHED_DEBUG */
270 #ifdef CONFIG_COMPACTION
271 static int min_extfrag_threshold;
272 static int max_extfrag_threshold = 1000;
275 static struct ctl_table kern_table[] = {
277 .procname = "sched_child_runs_first",
278 .data = &sysctl_sched_child_runs_first,
279 .maxlen = sizeof(unsigned int),
281 .proc_handler = proc_dointvec,
283 #ifdef CONFIG_SCHED_DEBUG
285 .procname = "sched_min_granularity_ns",
286 .data = &sysctl_sched_min_granularity,
287 .maxlen = sizeof(unsigned int),
289 .proc_handler = sched_proc_update_handler,
290 .extra1 = &min_sched_granularity_ns,
291 .extra2 = &max_sched_granularity_ns,
294 .procname = "sched_latency_ns",
295 .data = &sysctl_sched_latency,
296 .maxlen = sizeof(unsigned int),
298 .proc_handler = sched_proc_update_handler,
299 .extra1 = &min_sched_granularity_ns,
300 .extra2 = &max_sched_granularity_ns,
303 .procname = "sched_wakeup_granularity_ns",
304 .data = &sysctl_sched_wakeup_granularity,
305 .maxlen = sizeof(unsigned int),
307 .proc_handler = sched_proc_update_handler,
308 .extra1 = &min_wakeup_granularity_ns,
309 .extra2 = &max_wakeup_granularity_ns,
313 .procname = "sched_tunable_scaling",
314 .data = &sysctl_sched_tunable_scaling,
315 .maxlen = sizeof(enum sched_tunable_scaling),
317 .proc_handler = sched_proc_update_handler,
318 .extra1 = &min_sched_tunable_scaling,
319 .extra2 = &max_sched_tunable_scaling,
322 .procname = "sched_migration_cost_ns",
323 .data = &sysctl_sched_migration_cost,
324 .maxlen = sizeof(unsigned int),
326 .proc_handler = proc_dointvec,
329 .procname = "sched_nr_migrate",
330 .data = &sysctl_sched_nr_migrate,
331 .maxlen = sizeof(unsigned int),
333 .proc_handler = proc_dointvec,
336 .procname = "sched_time_avg_ms",
337 .data = &sysctl_sched_time_avg,
338 .maxlen = sizeof(unsigned int),
340 .proc_handler = proc_dointvec,
343 .procname = "sched_shares_window_ns",
344 .data = &sysctl_sched_shares_window,
345 .maxlen = sizeof(unsigned int),
347 .proc_handler = proc_dointvec,
350 .procname = "timer_migration",
351 .data = &sysctl_timer_migration,
352 .maxlen = sizeof(unsigned int),
354 .proc_handler = proc_dointvec_minmax,
358 #endif /* CONFIG_SMP */
359 #ifdef CONFIG_NUMA_BALANCING
361 .procname = "numa_balancing_scan_delay_ms",
362 .data = &sysctl_numa_balancing_scan_delay,
363 .maxlen = sizeof(unsigned int),
365 .proc_handler = proc_dointvec,
368 .procname = "numa_balancing_scan_period_min_ms",
369 .data = &sysctl_numa_balancing_scan_period_min,
370 .maxlen = sizeof(unsigned int),
372 .proc_handler = proc_dointvec,
375 .procname = "numa_balancing_scan_period_max_ms",
376 .data = &sysctl_numa_balancing_scan_period_max,
377 .maxlen = sizeof(unsigned int),
379 .proc_handler = proc_dointvec,
382 .procname = "numa_balancing_scan_size_mb",
383 .data = &sysctl_numa_balancing_scan_size,
384 .maxlen = sizeof(unsigned int),
386 .proc_handler = proc_dointvec,
389 .procname = "numa_balancing_migrate_deferred",
390 .data = &sysctl_numa_balancing_migrate_deferred,
391 .maxlen = sizeof(unsigned int),
393 .proc_handler = proc_dointvec,
396 .procname = "numa_balancing",
397 .data = NULL, /* filled in by handler */
398 .maxlen = sizeof(unsigned int),
400 .proc_handler = sysctl_numa_balancing,
404 #endif /* CONFIG_NUMA_BALANCING */
405 #endif /* CONFIG_SCHED_DEBUG */
407 .procname = "sched_rt_period_us",
408 .data = &sysctl_sched_rt_period,
409 .maxlen = sizeof(unsigned int),
411 .proc_handler = sched_rt_handler,
414 .procname = "sched_rt_runtime_us",
415 .data = &sysctl_sched_rt_runtime,
416 .maxlen = sizeof(int),
418 .proc_handler = sched_rt_handler,
421 .procname = "sched_rr_timeslice_ms",
422 .data = &sched_rr_timeslice,
423 .maxlen = sizeof(int),
425 .proc_handler = sched_rr_handler,
427 #ifdef CONFIG_SCHED_AUTOGROUP
429 .procname = "sched_autogroup_enabled",
430 .data = &sysctl_sched_autogroup_enabled,
431 .maxlen = sizeof(unsigned int),
433 .proc_handler = proc_dointvec_minmax,
438 #ifdef CONFIG_CFS_BANDWIDTH
440 .procname = "sched_cfs_bandwidth_slice_us",
441 .data = &sysctl_sched_cfs_bandwidth_slice,
442 .maxlen = sizeof(unsigned int),
444 .proc_handler = proc_dointvec_minmax,
448 #ifdef CONFIG_PROVE_LOCKING
450 .procname = "prove_locking",
451 .data = &prove_locking,
452 .maxlen = sizeof(int),
454 .proc_handler = proc_dointvec,
457 #ifdef CONFIG_LOCK_STAT
459 .procname = "lock_stat",
461 .maxlen = sizeof(int),
463 .proc_handler = proc_dointvec,
468 .data = &panic_timeout,
469 .maxlen = sizeof(int),
471 .proc_handler = proc_dointvec,
473 #ifdef CONFIG_COREDUMP
475 .procname = "core_uses_pid",
476 .data = &core_uses_pid,
477 .maxlen = sizeof(int),
479 .proc_handler = proc_dointvec,
482 .procname = "core_pattern",
483 .data = core_pattern,
484 .maxlen = CORENAME_MAX_SIZE,
486 .proc_handler = proc_dostring_coredump,
489 .procname = "core_pipe_limit",
490 .data = &core_pipe_limit,
491 .maxlen = sizeof(unsigned int),
493 .proc_handler = proc_dointvec,
496 #ifdef CONFIG_PROC_SYSCTL
498 .procname = "tainted",
499 .maxlen = sizeof(long),
501 .proc_handler = proc_taint,
504 #ifdef CONFIG_LATENCYTOP
506 .procname = "latencytop",
507 .data = &latencytop_enabled,
508 .maxlen = sizeof(int),
510 .proc_handler = proc_dointvec,
513 #ifdef CONFIG_BLK_DEV_INITRD
515 .procname = "real-root-dev",
516 .data = &real_root_dev,
517 .maxlen = sizeof(int),
519 .proc_handler = proc_dointvec,
523 .procname = "print-fatal-signals",
524 .data = &print_fatal_signals,
525 .maxlen = sizeof(int),
527 .proc_handler = proc_dointvec,
531 .procname = "reboot-cmd",
532 .data = reboot_command,
535 .proc_handler = proc_dostring,
538 .procname = "stop-a",
539 .data = &stop_a_enabled,
540 .maxlen = sizeof (int),
542 .proc_handler = proc_dointvec,
545 .procname = "scons-poweroff",
546 .data = &scons_pwroff,
547 .maxlen = sizeof (int),
549 .proc_handler = proc_dointvec,
552 #ifdef CONFIG_SPARC64
554 .procname = "tsb-ratio",
555 .data = &sysctl_tsb_ratio,
556 .maxlen = sizeof (int),
558 .proc_handler = proc_dointvec,
563 .procname = "soft-power",
564 .data = &pwrsw_enabled,
565 .maxlen = sizeof (int),
567 .proc_handler = proc_dointvec,
570 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
572 .procname = "unaligned-trap",
573 .data = &unaligned_enabled,
574 .maxlen = sizeof (int),
576 .proc_handler = proc_dointvec,
580 .procname = "ctrl-alt-del",
582 .maxlen = sizeof(int),
584 .proc_handler = proc_dointvec,
586 #ifdef CONFIG_FUNCTION_TRACER
588 .procname = "ftrace_enabled",
589 .data = &ftrace_enabled,
590 .maxlen = sizeof(int),
592 .proc_handler = ftrace_enable_sysctl,
595 #ifdef CONFIG_STACK_TRACER
597 .procname = "stack_tracer_enabled",
598 .data = &stack_tracer_enabled,
599 .maxlen = sizeof(int),
601 .proc_handler = stack_trace_sysctl,
604 #ifdef CONFIG_TRACING
606 .procname = "ftrace_dump_on_oops",
607 .data = &ftrace_dump_on_oops,
608 .maxlen = sizeof(int),
610 .proc_handler = proc_dointvec,
613 .procname = "traceoff_on_warning",
614 .data = &__disable_trace_on_warning,
615 .maxlen = sizeof(__disable_trace_on_warning),
617 .proc_handler = proc_dointvec,
622 .procname = "kexec_load_disabled",
623 .data = &kexec_load_disabled,
624 .maxlen = sizeof(int),
626 /* only handle a transition from default "0" to "1" */
627 .proc_handler = proc_dointvec_minmax,
632 #ifdef CONFIG_MODULES
634 .procname = "modprobe",
635 .data = &modprobe_path,
636 .maxlen = KMOD_PATH_LEN,
638 .proc_handler = proc_dostring,
641 .procname = "modules_disabled",
642 .data = &modules_disabled,
643 .maxlen = sizeof(int),
645 /* only handle a transition from default "0" to "1" */
646 .proc_handler = proc_dointvec_minmax,
653 .procname = "hotplug",
654 .data = &uevent_helper,
655 .maxlen = UEVENT_HELPER_PATH_LEN,
657 .proc_handler = proc_dostring,
660 #ifdef CONFIG_CHR_DEV_SG
662 .procname = "sg-big-buff",
663 .data = &sg_big_buff,
664 .maxlen = sizeof (int),
666 .proc_handler = proc_dointvec,
669 #ifdef CONFIG_BSD_PROCESS_ACCT
673 .maxlen = 3*sizeof(int),
675 .proc_handler = proc_dointvec,
678 #ifdef CONFIG_MAGIC_SYSRQ
681 .data = &__sysrq_enabled,
682 .maxlen = sizeof (int),
684 .proc_handler = sysrq_sysctl_handler,
687 #ifdef CONFIG_PROC_SYSCTL
689 .procname = "cad_pid",
691 .maxlen = sizeof (int),
693 .proc_handler = proc_do_cad_pid,
697 .procname = "threads-max",
698 .data = &max_threads,
699 .maxlen = sizeof(int),
701 .proc_handler = proc_dointvec,
704 .procname = "random",
706 .child = random_table,
709 .procname = "usermodehelper",
711 .child = usermodehelper_table,
714 .procname = "overflowuid",
715 .data = &overflowuid,
716 .maxlen = sizeof(int),
718 .proc_handler = proc_dointvec_minmax,
719 .extra1 = &minolduid,
720 .extra2 = &maxolduid,
723 .procname = "overflowgid",
724 .data = &overflowgid,
725 .maxlen = sizeof(int),
727 .proc_handler = proc_dointvec_minmax,
728 .extra1 = &minolduid,
729 .extra2 = &maxolduid,
732 #ifdef CONFIG_MATHEMU
734 .procname = "ieee_emulation_warnings",
735 .data = &sysctl_ieee_emulation_warnings,
736 .maxlen = sizeof(int),
738 .proc_handler = proc_dointvec,
742 .procname = "userprocess_debug",
743 .data = &show_unhandled_signals,
744 .maxlen = sizeof(int),
746 .proc_handler = proc_dointvec,
750 .procname = "pid_max",
752 .maxlen = sizeof (int),
754 .proc_handler = proc_dointvec_minmax,
755 .extra1 = &pid_max_min,
756 .extra2 = &pid_max_max,
759 .procname = "panic_on_oops",
760 .data = &panic_on_oops,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec,
765 #if defined CONFIG_PRINTK
767 .procname = "printk",
768 .data = &console_loglevel,
769 .maxlen = 4*sizeof(int),
771 .proc_handler = proc_dointvec,
774 .procname = "printk_ratelimit",
775 .data = &printk_ratelimit_state.interval,
776 .maxlen = sizeof(int),
778 .proc_handler = proc_dointvec_jiffies,
781 .procname = "printk_ratelimit_burst",
782 .data = &printk_ratelimit_state.burst,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec,
788 .procname = "printk_delay",
789 .data = &printk_delay_msec,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec_minmax,
794 .extra2 = &ten_thousand,
797 .procname = "dmesg_restrict",
798 .data = &dmesg_restrict,
799 .maxlen = sizeof(int),
801 .proc_handler = proc_dointvec_minmax_sysadmin,
806 .procname = "kptr_restrict",
807 .data = &kptr_restrict,
808 .maxlen = sizeof(int),
810 .proc_handler = proc_dointvec_minmax_sysadmin,
816 .procname = "ngroups_max",
817 .data = &ngroups_max,
818 .maxlen = sizeof (int),
820 .proc_handler = proc_dointvec,
823 .procname = "cap_last_cap",
824 .data = (void *)&cap_last_cap,
825 .maxlen = sizeof(int),
827 .proc_handler = proc_dointvec,
829 #if defined(CONFIG_LOCKUP_DETECTOR)
831 .procname = "watchdog",
832 .data = &watchdog_user_enabled,
833 .maxlen = sizeof (int),
835 .proc_handler = proc_dowatchdog,
840 .procname = "watchdog_thresh",
841 .data = &watchdog_thresh,
842 .maxlen = sizeof(int),
844 .proc_handler = proc_dowatchdog,
849 .procname = "softlockup_panic",
850 .data = &softlockup_panic,
851 .maxlen = sizeof(int),
853 .proc_handler = proc_dointvec_minmax,
858 .procname = "nmi_watchdog",
859 .data = &watchdog_user_enabled,
860 .maxlen = sizeof (int),
862 .proc_handler = proc_dowatchdog,
867 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
869 .procname = "unknown_nmi_panic",
870 .data = &unknown_nmi_panic,
871 .maxlen = sizeof (int),
873 .proc_handler = proc_dointvec,
876 #if defined(CONFIG_X86)
878 .procname = "panic_on_unrecovered_nmi",
879 .data = &panic_on_unrecovered_nmi,
880 .maxlen = sizeof(int),
882 .proc_handler = proc_dointvec,
885 .procname = "panic_on_io_nmi",
886 .data = &panic_on_io_nmi,
887 .maxlen = sizeof(int),
889 .proc_handler = proc_dointvec,
891 #ifdef CONFIG_DEBUG_STACKOVERFLOW
893 .procname = "panic_on_stackoverflow",
894 .data = &sysctl_panic_on_stackoverflow,
895 .maxlen = sizeof(int),
897 .proc_handler = proc_dointvec,
901 .procname = "bootloader_type",
902 .data = &bootloader_type,
903 .maxlen = sizeof (int),
905 .proc_handler = proc_dointvec,
908 .procname = "bootloader_version",
909 .data = &bootloader_version,
910 .maxlen = sizeof (int),
912 .proc_handler = proc_dointvec,
915 .procname = "kstack_depth_to_print",
916 .data = &kstack_depth_to_print,
917 .maxlen = sizeof(int),
919 .proc_handler = proc_dointvec,
922 .procname = "io_delay_type",
923 .data = &io_delay_type,
924 .maxlen = sizeof(int),
926 .proc_handler = proc_dointvec,
929 #if defined(CONFIG_MMU)
931 .procname = "randomize_va_space",
932 .data = &randomize_va_space,
933 .maxlen = sizeof(int),
935 .proc_handler = proc_dointvec,
938 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
940 .procname = "spin_retry",
942 .maxlen = sizeof (int),
944 .proc_handler = proc_dointvec,
947 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
949 .procname = "acpi_video_flags",
950 .data = &acpi_realmode_flags,
951 .maxlen = sizeof (unsigned long),
953 .proc_handler = proc_doulongvec_minmax,
956 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
958 .procname = "ignore-unaligned-usertrap",
959 .data = &no_unaligned_warning,
960 .maxlen = sizeof (int),
962 .proc_handler = proc_dointvec,
967 .procname = "unaligned-dump-stack",
968 .data = &unaligned_dump_stack,
969 .maxlen = sizeof (int),
971 .proc_handler = proc_dointvec,
974 #ifdef CONFIG_DETECT_HUNG_TASK
976 .procname = "hung_task_panic",
977 .data = &sysctl_hung_task_panic,
978 .maxlen = sizeof(int),
980 .proc_handler = proc_dointvec_minmax,
985 .procname = "hung_task_check_count",
986 .data = &sysctl_hung_task_check_count,
987 .maxlen = sizeof(int),
989 .proc_handler = proc_dointvec_minmax,
993 .procname = "hung_task_timeout_secs",
994 .data = &sysctl_hung_task_timeout_secs,
995 .maxlen = sizeof(unsigned long),
997 .proc_handler = proc_dohung_task_timeout_secs,
1000 .procname = "hung_task_warnings",
1001 .data = &sysctl_hung_task_warnings,
1002 .maxlen = sizeof(int),
1004 .proc_handler = proc_dointvec_minmax,
1008 #ifdef CONFIG_COMPAT
1010 .procname = "compat-log",
1011 .data = &compat_log,
1012 .maxlen = sizeof (int),
1014 .proc_handler = proc_dointvec,
1017 #ifdef CONFIG_RT_MUTEXES
1019 .procname = "max_lock_depth",
1020 .data = &max_lock_depth,
1021 .maxlen = sizeof(int),
1023 .proc_handler = proc_dointvec,
1027 .procname = "poweroff_cmd",
1028 .data = &poweroff_cmd,
1029 .maxlen = POWEROFF_CMD_PATH_LEN,
1031 .proc_handler = proc_dostring,
1037 .child = key_sysctls,
1040 #ifdef CONFIG_RCU_TORTURE_TEST
1042 .procname = "rcutorture_runnable",
1043 .data = &rcutorture_runnable,
1044 .maxlen = sizeof(int),
1046 .proc_handler = proc_dointvec,
1049 #ifdef CONFIG_PERF_EVENTS
1051 * User-space scripts rely on the existence of this file
1052 * as a feature check for perf_events being enabled.
1054 * So it's an ABI, do not remove!
1057 .procname = "perf_event_paranoid",
1058 .data = &sysctl_perf_event_paranoid,
1059 .maxlen = sizeof(sysctl_perf_event_paranoid),
1061 .proc_handler = proc_dointvec,
1064 .procname = "perf_event_mlock_kb",
1065 .data = &sysctl_perf_event_mlock,
1066 .maxlen = sizeof(sysctl_perf_event_mlock),
1068 .proc_handler = proc_dointvec,
1071 .procname = "perf_event_max_sample_rate",
1072 .data = &sysctl_perf_event_sample_rate,
1073 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1075 .proc_handler = perf_proc_update_handler,
1079 .procname = "perf_cpu_time_max_percent",
1080 .data = &sysctl_perf_cpu_time_max_percent,
1081 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1083 .proc_handler = perf_cpu_time_max_percent_handler,
1085 .extra2 = &one_hundred,
1088 #ifdef CONFIG_KMEMCHECK
1090 .procname = "kmemcheck",
1091 .data = &kmemcheck_enabled,
1092 .maxlen = sizeof(int),
1094 .proc_handler = proc_dointvec,
1099 .procname = "blk_iopoll",
1100 .data = &blk_iopoll_enabled,
1101 .maxlen = sizeof(int),
1103 .proc_handler = proc_dointvec,
1109 static struct ctl_table vm_table[] = {
1111 .procname = "overcommit_memory",
1112 .data = &sysctl_overcommit_memory,
1113 .maxlen = sizeof(sysctl_overcommit_memory),
1115 .proc_handler = proc_dointvec_minmax,
1120 .procname = "panic_on_oom",
1121 .data = &sysctl_panic_on_oom,
1122 .maxlen = sizeof(sysctl_panic_on_oom),
1124 .proc_handler = proc_dointvec_minmax,
1129 .procname = "oom_kill_allocating_task",
1130 .data = &sysctl_oom_kill_allocating_task,
1131 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1133 .proc_handler = proc_dointvec,
1136 .procname = "oom_dump_tasks",
1137 .data = &sysctl_oom_dump_tasks,
1138 .maxlen = sizeof(sysctl_oom_dump_tasks),
1140 .proc_handler = proc_dointvec,
1143 .procname = "overcommit_ratio",
1144 .data = &sysctl_overcommit_ratio,
1145 .maxlen = sizeof(sysctl_overcommit_ratio),
1147 .proc_handler = overcommit_ratio_handler,
1150 .procname = "overcommit_kbytes",
1151 .data = &sysctl_overcommit_kbytes,
1152 .maxlen = sizeof(sysctl_overcommit_kbytes),
1154 .proc_handler = overcommit_kbytes_handler,
1157 .procname = "page-cluster",
1158 .data = &page_cluster,
1159 .maxlen = sizeof(int),
1161 .proc_handler = proc_dointvec_minmax,
1165 .procname = "dirty_background_ratio",
1166 .data = &dirty_background_ratio,
1167 .maxlen = sizeof(dirty_background_ratio),
1169 .proc_handler = dirty_background_ratio_handler,
1171 .extra2 = &one_hundred,
1174 .procname = "dirty_background_bytes",
1175 .data = &dirty_background_bytes,
1176 .maxlen = sizeof(dirty_background_bytes),
1178 .proc_handler = dirty_background_bytes_handler,
1182 .procname = "dirty_ratio",
1183 .data = &vm_dirty_ratio,
1184 .maxlen = sizeof(vm_dirty_ratio),
1186 .proc_handler = dirty_ratio_handler,
1188 .extra2 = &one_hundred,
1191 .procname = "dirty_bytes",
1192 .data = &vm_dirty_bytes,
1193 .maxlen = sizeof(vm_dirty_bytes),
1195 .proc_handler = dirty_bytes_handler,
1196 .extra1 = &dirty_bytes_min,
1199 .procname = "dirty_writeback_centisecs",
1200 .data = &dirty_writeback_interval,
1201 .maxlen = sizeof(dirty_writeback_interval),
1203 .proc_handler = dirty_writeback_centisecs_handler,
1206 .procname = "dirty_expire_centisecs",
1207 .data = &dirty_expire_interval,
1208 .maxlen = sizeof(dirty_expire_interval),
1210 .proc_handler = proc_dointvec_minmax,
1214 .procname = "nr_pdflush_threads",
1215 .mode = 0444 /* read-only */,
1216 .proc_handler = pdflush_proc_obsolete,
1219 .procname = "swappiness",
1220 .data = &vm_swappiness,
1221 .maxlen = sizeof(vm_swappiness),
1223 .proc_handler = proc_dointvec_minmax,
1225 .extra2 = &one_hundred,
1227 #ifdef CONFIG_HUGETLB_PAGE
1229 .procname = "nr_hugepages",
1231 .maxlen = sizeof(unsigned long),
1233 .proc_handler = hugetlb_sysctl_handler,
1234 .extra1 = (void *)&hugetlb_zero,
1235 .extra2 = (void *)&hugetlb_infinity,
1239 .procname = "nr_hugepages_mempolicy",
1241 .maxlen = sizeof(unsigned long),
1243 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1244 .extra1 = (void *)&hugetlb_zero,
1245 .extra2 = (void *)&hugetlb_infinity,
1249 .procname = "hugetlb_shm_group",
1250 .data = &sysctl_hugetlb_shm_group,
1251 .maxlen = sizeof(gid_t),
1253 .proc_handler = proc_dointvec,
1256 .procname = "hugepages_treat_as_movable",
1257 .data = &hugepages_treat_as_movable,
1258 .maxlen = sizeof(int),
1260 .proc_handler = proc_dointvec,
1263 .procname = "nr_overcommit_hugepages",
1265 .maxlen = sizeof(unsigned long),
1267 .proc_handler = hugetlb_overcommit_handler,
1268 .extra1 = (void *)&hugetlb_zero,
1269 .extra2 = (void *)&hugetlb_infinity,
1273 .procname = "lowmem_reserve_ratio",
1274 .data = &sysctl_lowmem_reserve_ratio,
1275 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1277 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1280 .procname = "drop_caches",
1281 .data = &sysctl_drop_caches,
1282 .maxlen = sizeof(int),
1284 .proc_handler = drop_caches_sysctl_handler,
1288 #ifdef CONFIG_COMPACTION
1290 .procname = "compact_memory",
1291 .data = &sysctl_compact_memory,
1292 .maxlen = sizeof(int),
1294 .proc_handler = sysctl_compaction_handler,
1297 .procname = "extfrag_threshold",
1298 .data = &sysctl_extfrag_threshold,
1299 .maxlen = sizeof(int),
1301 .proc_handler = sysctl_extfrag_handler,
1302 .extra1 = &min_extfrag_threshold,
1303 .extra2 = &max_extfrag_threshold,
1306 #endif /* CONFIG_COMPACTION */
1308 .procname = "min_free_kbytes",
1309 .data = &min_free_kbytes,
1310 .maxlen = sizeof(min_free_kbytes),
1312 .proc_handler = min_free_kbytes_sysctl_handler,
1316 .procname = "percpu_pagelist_fraction",
1317 .data = &percpu_pagelist_fraction,
1318 .maxlen = sizeof(percpu_pagelist_fraction),
1320 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1321 .extra1 = &min_percpu_pagelist_fract,
1325 .procname = "max_map_count",
1326 .data = &sysctl_max_map_count,
1327 .maxlen = sizeof(sysctl_max_map_count),
1329 .proc_handler = proc_dointvec_minmax,
1334 .procname = "nr_trim_pages",
1335 .data = &sysctl_nr_trim_pages,
1336 .maxlen = sizeof(sysctl_nr_trim_pages),
1338 .proc_handler = proc_dointvec_minmax,
1343 .procname = "laptop_mode",
1344 .data = &laptop_mode,
1345 .maxlen = sizeof(laptop_mode),
1347 .proc_handler = proc_dointvec_jiffies,
1350 .procname = "block_dump",
1351 .data = &block_dump,
1352 .maxlen = sizeof(block_dump),
1354 .proc_handler = proc_dointvec,
1358 .procname = "vfs_cache_pressure",
1359 .data = &sysctl_vfs_cache_pressure,
1360 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1362 .proc_handler = proc_dointvec,
1365 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1367 .procname = "legacy_va_layout",
1368 .data = &sysctl_legacy_va_layout,
1369 .maxlen = sizeof(sysctl_legacy_va_layout),
1371 .proc_handler = proc_dointvec,
1377 .procname = "zone_reclaim_mode",
1378 .data = &zone_reclaim_mode,
1379 .maxlen = sizeof(zone_reclaim_mode),
1381 .proc_handler = proc_dointvec,
1385 .procname = "min_unmapped_ratio",
1386 .data = &sysctl_min_unmapped_ratio,
1387 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1389 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1391 .extra2 = &one_hundred,
1394 .procname = "min_slab_ratio",
1395 .data = &sysctl_min_slab_ratio,
1396 .maxlen = sizeof(sysctl_min_slab_ratio),
1398 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1400 .extra2 = &one_hundred,
1405 .procname = "stat_interval",
1406 .data = &sysctl_stat_interval,
1407 .maxlen = sizeof(sysctl_stat_interval),
1409 .proc_handler = proc_dointvec_jiffies,
1414 .procname = "mmap_min_addr",
1415 .data = &dac_mmap_min_addr,
1416 .maxlen = sizeof(unsigned long),
1418 .proc_handler = mmap_min_addr_handler,
1423 .procname = "numa_zonelist_order",
1424 .data = &numa_zonelist_order,
1425 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1427 .proc_handler = numa_zonelist_order_handler,
1430 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1431 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1433 .procname = "vdso_enabled",
1434 .data = &vdso_enabled,
1435 .maxlen = sizeof(vdso_enabled),
1437 .proc_handler = proc_dointvec,
1441 #ifdef CONFIG_HIGHMEM
1443 .procname = "highmem_is_dirtyable",
1444 .data = &vm_highmem_is_dirtyable,
1445 .maxlen = sizeof(vm_highmem_is_dirtyable),
1447 .proc_handler = proc_dointvec_minmax,
1453 .procname = "scan_unevictable_pages",
1454 .data = &scan_unevictable_pages,
1455 .maxlen = sizeof(scan_unevictable_pages),
1457 .proc_handler = scan_unevictable_handler,
1459 #ifdef CONFIG_MEMORY_FAILURE
1461 .procname = "memory_failure_early_kill",
1462 .data = &sysctl_memory_failure_early_kill,
1463 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1465 .proc_handler = proc_dointvec_minmax,
1470 .procname = "memory_failure_recovery",
1471 .data = &sysctl_memory_failure_recovery,
1472 .maxlen = sizeof(sysctl_memory_failure_recovery),
1474 .proc_handler = proc_dointvec_minmax,
1480 .procname = "user_reserve_kbytes",
1481 .data = &sysctl_user_reserve_kbytes,
1482 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1484 .proc_handler = proc_doulongvec_minmax,
1487 .procname = "admin_reserve_kbytes",
1488 .data = &sysctl_admin_reserve_kbytes,
1489 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1491 .proc_handler = proc_doulongvec_minmax,
1496 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1497 static struct ctl_table binfmt_misc_table[] = {
1502 static struct ctl_table fs_table[] = {
1504 .procname = "inode-nr",
1505 .data = &inodes_stat,
1506 .maxlen = 2*sizeof(long),
1508 .proc_handler = proc_nr_inodes,
1511 .procname = "inode-state",
1512 .data = &inodes_stat,
1513 .maxlen = 7*sizeof(long),
1515 .proc_handler = proc_nr_inodes,
1518 .procname = "file-nr",
1519 .data = &files_stat,
1520 .maxlen = sizeof(files_stat),
1522 .proc_handler = proc_nr_files,
1525 .procname = "file-max",
1526 .data = &files_stat.max_files,
1527 .maxlen = sizeof(files_stat.max_files),
1529 .proc_handler = proc_doulongvec_minmax,
1532 .procname = "nr_open",
1533 .data = &sysctl_nr_open,
1534 .maxlen = sizeof(int),
1536 .proc_handler = proc_dointvec_minmax,
1537 .extra1 = &sysctl_nr_open_min,
1538 .extra2 = &sysctl_nr_open_max,
1541 .procname = "dentry-state",
1542 .data = &dentry_stat,
1543 .maxlen = 6*sizeof(long),
1545 .proc_handler = proc_nr_dentry,
1548 .procname = "overflowuid",
1549 .data = &fs_overflowuid,
1550 .maxlen = sizeof(int),
1552 .proc_handler = proc_dointvec_minmax,
1553 .extra1 = &minolduid,
1554 .extra2 = &maxolduid,
1557 .procname = "overflowgid",
1558 .data = &fs_overflowgid,
1559 .maxlen = sizeof(int),
1561 .proc_handler = proc_dointvec_minmax,
1562 .extra1 = &minolduid,
1563 .extra2 = &maxolduid,
1565 #ifdef CONFIG_FILE_LOCKING
1567 .procname = "leases-enable",
1568 .data = &leases_enable,
1569 .maxlen = sizeof(int),
1571 .proc_handler = proc_dointvec,
1574 #ifdef CONFIG_DNOTIFY
1576 .procname = "dir-notify-enable",
1577 .data = &dir_notify_enable,
1578 .maxlen = sizeof(int),
1580 .proc_handler = proc_dointvec,
1584 #ifdef CONFIG_FILE_LOCKING
1586 .procname = "lease-break-time",
1587 .data = &lease_break_time,
1588 .maxlen = sizeof(int),
1590 .proc_handler = proc_dointvec,
1595 .procname = "aio-nr",
1597 .maxlen = sizeof(aio_nr),
1599 .proc_handler = proc_doulongvec_minmax,
1602 .procname = "aio-max-nr",
1603 .data = &aio_max_nr,
1604 .maxlen = sizeof(aio_max_nr),
1606 .proc_handler = proc_doulongvec_minmax,
1608 #endif /* CONFIG_AIO */
1609 #ifdef CONFIG_INOTIFY_USER
1611 .procname = "inotify",
1613 .child = inotify_table,
1618 .procname = "epoll",
1620 .child = epoll_table,
1625 .procname = "protected_symlinks",
1626 .data = &sysctl_protected_symlinks,
1627 .maxlen = sizeof(int),
1629 .proc_handler = proc_dointvec_minmax,
1634 .procname = "protected_hardlinks",
1635 .data = &sysctl_protected_hardlinks,
1636 .maxlen = sizeof(int),
1638 .proc_handler = proc_dointvec_minmax,
1643 .procname = "suid_dumpable",
1644 .data = &suid_dumpable,
1645 .maxlen = sizeof(int),
1647 .proc_handler = proc_dointvec_minmax_coredump,
1651 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1653 .procname = "binfmt_misc",
1655 .child = binfmt_misc_table,
1659 .procname = "pipe-max-size",
1660 .data = &pipe_max_size,
1661 .maxlen = sizeof(int),
1663 .proc_handler = &pipe_proc_fn,
1664 .extra1 = &pipe_min_size,
1669 static struct ctl_table debug_table[] = {
1670 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1672 .procname = "exception-trace",
1673 .data = &show_unhandled_signals,
1674 .maxlen = sizeof(int),
1676 .proc_handler = proc_dointvec
1679 #if defined(CONFIG_OPTPROBES)
1681 .procname = "kprobes-optimization",
1682 .data = &sysctl_kprobes_optimization,
1683 .maxlen = sizeof(int),
1685 .proc_handler = proc_kprobes_optimization_handler,
1693 static struct ctl_table dev_table[] = {
1697 int __init sysctl_init(void)
1699 struct ctl_table_header *hdr;
1701 hdr = register_sysctl_table(sysctl_base_table);
1702 kmemleak_not_leak(hdr);
1706 #endif /* CONFIG_SYSCTL */
1712 #ifdef CONFIG_PROC_SYSCTL
1714 static int _proc_do_string(void* data, int maxlen, int write,
1715 void __user *buffer,
1716 size_t *lenp, loff_t *ppos)
1722 if (!data || !maxlen || !*lenp) {
1730 while (len < *lenp) {
1731 if (get_user(c, p++))
1733 if (c == 0 || c == '\n')
1739 if(copy_from_user(data, buffer, len))
1741 ((char *) data)[len] = 0;
1759 if(copy_to_user(buffer, data, len))
1762 if(put_user('\n', ((char __user *) buffer) + len))
1773 * proc_dostring - read a string sysctl
1774 * @table: the sysctl table
1775 * @write: %TRUE if this is a write to the sysctl file
1776 * @buffer: the user buffer
1777 * @lenp: the size of the user buffer
1778 * @ppos: file position
1780 * Reads/writes a string from/to the user buffer. If the kernel
1781 * buffer provided is not large enough to hold the string, the
1782 * string is truncated. The copied string is %NULL-terminated.
1783 * If the string is being read by the user process, it is copied
1784 * and a newline '\n' is added. It is truncated if the buffer is
1787 * Returns 0 on success.
1789 int proc_dostring(struct ctl_table *table, int write,
1790 void __user *buffer, size_t *lenp, loff_t *ppos)
1792 return _proc_do_string(table->data, table->maxlen, write,
1793 buffer, lenp, ppos);
1796 static size_t proc_skip_spaces(char **buf)
1799 char *tmp = skip_spaces(*buf);
1805 static void proc_skip_char(char **buf, size_t *size, const char v)
1815 #define TMPBUFLEN 22
1817 * proc_get_long - reads an ASCII formatted integer from a user buffer
1819 * @buf: a kernel buffer
1820 * @size: size of the kernel buffer
1821 * @val: this is where the number will be stored
1822 * @neg: set to %TRUE if number is negative
1823 * @perm_tr: a vector which contains the allowed trailers
1824 * @perm_tr_len: size of the perm_tr vector
1825 * @tr: pointer to store the trailer character
1827 * In case of success %0 is returned and @buf and @size are updated with
1828 * the amount of bytes read. If @tr is non-NULL and a trailing
1829 * character exists (size is non-zero after returning from this
1830 * function), @tr is updated with the trailing character.
1832 static int proc_get_long(char **buf, size_t *size,
1833 unsigned long *val, bool *neg,
1834 const char *perm_tr, unsigned perm_tr_len, char *tr)
1837 char *p, tmp[TMPBUFLEN];
1843 if (len > TMPBUFLEN - 1)
1844 len = TMPBUFLEN - 1;
1846 memcpy(tmp, *buf, len);
1850 if (*p == '-' && *size > 1) {
1858 *val = simple_strtoul(p, &p, 0);
1862 /* We don't know if the next char is whitespace thus we may accept
1863 * invalid integers (e.g. 1234...a) or two integers instead of one
1864 * (e.g. 123...1). So lets not allow such large numbers. */
1865 if (len == TMPBUFLEN - 1)
1868 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1871 if (tr && (len < *size))
1881 * proc_put_long - converts an integer to a decimal ASCII formatted string
1883 * @buf: the user buffer
1884 * @size: the size of the user buffer
1885 * @val: the integer to be converted
1886 * @neg: sign of the number, %TRUE for negative
1888 * In case of success %0 is returned and @buf and @size are updated with
1889 * the amount of bytes written.
1891 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1895 char tmp[TMPBUFLEN], *p = tmp;
1897 sprintf(p, "%s%lu", neg ? "-" : "", val);
1901 if (copy_to_user(*buf, tmp, len))
1909 static int proc_put_char(void __user **buf, size_t *size, char c)
1912 char __user **buffer = (char __user **)buf;
1913 if (put_user(c, *buffer))
1915 (*size)--, (*buffer)++;
1921 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1923 int write, void *data)
1926 *valp = *negp ? -*lvalp : *lvalp;
1931 *lvalp = (unsigned long)-val;
1934 *lvalp = (unsigned long)val;
1940 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1942 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1943 int write, void __user *buffer,
1944 size_t *lenp, loff_t *ppos,
1945 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1946 int write, void *data),
1949 int *i, vleft, first = 1, err = 0;
1950 unsigned long page = 0;
1954 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1959 i = (int *) tbl_data;
1960 vleft = table->maxlen / sizeof(*i);
1964 conv = do_proc_dointvec_conv;
1967 if (left > PAGE_SIZE - 1)
1968 left = PAGE_SIZE - 1;
1969 page = __get_free_page(GFP_TEMPORARY);
1970 kbuf = (char *) page;
1973 if (copy_from_user(kbuf, buffer, left)) {
1980 for (; left && vleft--; i++, first=0) {
1985 left -= proc_skip_spaces(&kbuf);
1989 err = proc_get_long(&kbuf, &left, &lval, &neg,
1991 sizeof(proc_wspace_sep), NULL);
1994 if (conv(&neg, &lval, i, 1, data)) {
1999 if (conv(&neg, &lval, i, 0, data)) {
2004 err = proc_put_char(&buffer, &left, '\t');
2007 err = proc_put_long(&buffer, &left, lval, neg);
2013 if (!write && !first && left && !err)
2014 err = proc_put_char(&buffer, &left, '\n');
2015 if (write && !err && left)
2016 left -= proc_skip_spaces(&kbuf);
2021 return err ? : -EINVAL;
2028 static int do_proc_dointvec(struct ctl_table *table, int write,
2029 void __user *buffer, size_t *lenp, loff_t *ppos,
2030 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2031 int write, void *data),
2034 return __do_proc_dointvec(table->data, table, write,
2035 buffer, lenp, ppos, conv, data);
2039 * proc_dointvec - read a vector of integers
2040 * @table: the sysctl table
2041 * @write: %TRUE if this is a write to the sysctl file
2042 * @buffer: the user buffer
2043 * @lenp: the size of the user buffer
2044 * @ppos: file position
2046 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2047 * values from/to the user buffer, treated as an ASCII string.
2049 * Returns 0 on success.
2051 int proc_dointvec(struct ctl_table *table, int write,
2052 void __user *buffer, size_t *lenp, loff_t *ppos)
2054 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2059 * Taint values can only be increased
2060 * This means we can safely use a temporary.
2062 static int proc_taint(struct ctl_table *table, int write,
2063 void __user *buffer, size_t *lenp, loff_t *ppos)
2066 unsigned long tmptaint = get_taint();
2069 if (write && !capable(CAP_SYS_ADMIN))
2074 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2080 * Poor man's atomic or. Not worth adding a primitive
2081 * to everyone's atomic.h for this
2084 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2085 if ((tmptaint >> i) & 1)
2086 add_taint(i, LOCKDEP_STILL_OK);
2093 #ifdef CONFIG_PRINTK
2094 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2095 void __user *buffer, size_t *lenp, loff_t *ppos)
2097 if (write && !capable(CAP_SYS_ADMIN))
2100 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2104 struct do_proc_dointvec_minmax_conv_param {
2109 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2111 int write, void *data)
2113 struct do_proc_dointvec_minmax_conv_param *param = data;
2115 int val = *negp ? -*lvalp : *lvalp;
2116 if ((param->min && *param->min > val) ||
2117 (param->max && *param->max < val))
2124 *lvalp = (unsigned long)-val;
2127 *lvalp = (unsigned long)val;
2134 * proc_dointvec_minmax - read a vector of integers with min/max values
2135 * @table: the sysctl table
2136 * @write: %TRUE if this is a write to the sysctl file
2137 * @buffer: the user buffer
2138 * @lenp: the size of the user buffer
2139 * @ppos: file position
2141 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2142 * values from/to the user buffer, treated as an ASCII string.
2144 * This routine will ensure the values are within the range specified by
2145 * table->extra1 (min) and table->extra2 (max).
2147 * Returns 0 on success.
2149 int proc_dointvec_minmax(struct ctl_table *table, int write,
2150 void __user *buffer, size_t *lenp, loff_t *ppos)
2152 struct do_proc_dointvec_minmax_conv_param param = {
2153 .min = (int *) table->extra1,
2154 .max = (int *) table->extra2,
2156 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2157 do_proc_dointvec_minmax_conv, ¶m);
2160 static void validate_coredump_safety(void)
2162 #ifdef CONFIG_COREDUMP
2163 if (suid_dumpable == SUID_DUMP_ROOT &&
2164 core_pattern[0] != '/' && core_pattern[0] != '|') {
2165 printk(KERN_WARNING "Unsafe core_pattern used with "\
2166 "suid_dumpable=2. Pipe handler or fully qualified "\
2167 "core dump path required.\n");
2172 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2173 void __user *buffer, size_t *lenp, loff_t *ppos)
2175 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2177 validate_coredump_safety();
2181 #ifdef CONFIG_COREDUMP
2182 static int proc_dostring_coredump(struct ctl_table *table, int write,
2183 void __user *buffer, size_t *lenp, loff_t *ppos)
2185 int error = proc_dostring(table, write, buffer, lenp, ppos);
2187 validate_coredump_safety();
2192 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2193 void __user *buffer,
2194 size_t *lenp, loff_t *ppos,
2195 unsigned long convmul,
2196 unsigned long convdiv)
2198 unsigned long *i, *min, *max;
2199 int vleft, first = 1, err = 0;
2200 unsigned long page = 0;
2204 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2209 i = (unsigned long *) data;
2210 min = (unsigned long *) table->extra1;
2211 max = (unsigned long *) table->extra2;
2212 vleft = table->maxlen / sizeof(unsigned long);
2216 if (left > PAGE_SIZE - 1)
2217 left = PAGE_SIZE - 1;
2218 page = __get_free_page(GFP_TEMPORARY);
2219 kbuf = (char *) page;
2222 if (copy_from_user(kbuf, buffer, left)) {
2229 for (; left && vleft--; i++, first = 0) {
2235 left -= proc_skip_spaces(&kbuf);
2237 err = proc_get_long(&kbuf, &left, &val, &neg,
2239 sizeof(proc_wspace_sep), NULL);
2244 if ((min && val < *min) || (max && val > *max))
2248 val = convdiv * (*i) / convmul;
2250 err = proc_put_char(&buffer, &left, '\t');
2254 err = proc_put_long(&buffer, &left, val, false);
2260 if (!write && !first && left && !err)
2261 err = proc_put_char(&buffer, &left, '\n');
2263 left -= proc_skip_spaces(&kbuf);
2268 return err ? : -EINVAL;
2275 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2276 void __user *buffer,
2277 size_t *lenp, loff_t *ppos,
2278 unsigned long convmul,
2279 unsigned long convdiv)
2281 return __do_proc_doulongvec_minmax(table->data, table, write,
2282 buffer, lenp, ppos, convmul, convdiv);
2286 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2287 * @table: the sysctl table
2288 * @write: %TRUE if this is a write to the sysctl file
2289 * @buffer: the user buffer
2290 * @lenp: the size of the user buffer
2291 * @ppos: file position
2293 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2294 * values from/to the user buffer, treated as an ASCII string.
2296 * This routine will ensure the values are within the range specified by
2297 * table->extra1 (min) and table->extra2 (max).
2299 * Returns 0 on success.
2301 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2302 void __user *buffer, size_t *lenp, loff_t *ppos)
2304 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2308 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2309 * @table: the sysctl table
2310 * @write: %TRUE if this is a write to the sysctl file
2311 * @buffer: the user buffer
2312 * @lenp: the size of the user buffer
2313 * @ppos: file position
2315 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2316 * values from/to the user buffer, treated as an ASCII string. The values
2317 * are treated as milliseconds, and converted to jiffies when they are stored.
2319 * This routine will ensure the values are within the range specified by
2320 * table->extra1 (min) and table->extra2 (max).
2322 * Returns 0 on success.
2324 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2325 void __user *buffer,
2326 size_t *lenp, loff_t *ppos)
2328 return do_proc_doulongvec_minmax(table, write, buffer,
2329 lenp, ppos, HZ, 1000l);
2333 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2335 int write, void *data)
2338 if (*lvalp > LONG_MAX / HZ)
2340 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2346 lval = (unsigned long)-val;
2349 lval = (unsigned long)val;
2356 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2358 int write, void *data)
2361 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2363 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2369 lval = (unsigned long)-val;
2372 lval = (unsigned long)val;
2374 *lvalp = jiffies_to_clock_t(lval);
2379 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2381 int write, void *data)
2384 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2394 lval = (unsigned long)-val;
2397 lval = (unsigned long)val;
2399 *lvalp = jiffies_to_msecs(lval);
2405 * proc_dointvec_jiffies - read a vector of integers as seconds
2406 * @table: the sysctl table
2407 * @write: %TRUE if this is a write to the sysctl file
2408 * @buffer: the user buffer
2409 * @lenp: the size of the user buffer
2410 * @ppos: file position
2412 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2413 * values from/to the user buffer, treated as an ASCII string.
2414 * The values read are assumed to be in seconds, and are converted into
2417 * Returns 0 on success.
2419 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2420 void __user *buffer, size_t *lenp, loff_t *ppos)
2422 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2423 do_proc_dointvec_jiffies_conv,NULL);
2427 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2428 * @table: the sysctl table
2429 * @write: %TRUE if this is a write to the sysctl file
2430 * @buffer: the user buffer
2431 * @lenp: the size of the user buffer
2432 * @ppos: pointer to the file position
2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2435 * values from/to the user buffer, treated as an ASCII string.
2436 * The values read are assumed to be in 1/USER_HZ seconds, and
2437 * are converted into jiffies.
2439 * Returns 0 on success.
2441 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2442 void __user *buffer, size_t *lenp, loff_t *ppos)
2444 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2445 do_proc_dointvec_userhz_jiffies_conv,NULL);
2449 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2455 * @ppos: the current position in the file
2457 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2458 * values from/to the user buffer, treated as an ASCII string.
2459 * The values read are assumed to be in 1/1000 seconds, and
2460 * are converted into jiffies.
2462 * Returns 0 on success.
2464 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2467 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2468 do_proc_dointvec_ms_jiffies_conv, NULL);
2471 static int proc_do_cad_pid(struct ctl_table *table, int write,
2472 void __user *buffer, size_t *lenp, loff_t *ppos)
2474 struct pid *new_pid;
2478 tmp = pid_vnr(cad_pid);
2480 r = __do_proc_dointvec(&tmp, table, write, buffer,
2481 lenp, ppos, NULL, NULL);
2485 new_pid = find_get_pid(tmp);
2489 put_pid(xchg(&cad_pid, new_pid));
2494 * proc_do_large_bitmap - read/write from/to a large bitmap
2495 * @table: the sysctl table
2496 * @write: %TRUE if this is a write to the sysctl file
2497 * @buffer: the user buffer
2498 * @lenp: the size of the user buffer
2499 * @ppos: file position
2501 * The bitmap is stored at table->data and the bitmap length (in bits)
2504 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2505 * large bitmaps may be represented in a compact manner. Writing into
2506 * the file will clear the bitmap then update it with the given input.
2508 * Returns 0 on success.
2510 int proc_do_large_bitmap(struct ctl_table *table, int write,
2511 void __user *buffer, size_t *lenp, loff_t *ppos)
2515 size_t left = *lenp;
2516 unsigned long bitmap_len = table->maxlen;
2517 unsigned long *bitmap = (unsigned long *) table->data;
2518 unsigned long *tmp_bitmap = NULL;
2519 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2521 if (!bitmap_len || !left || (*ppos && !write)) {
2527 unsigned long page = 0;
2530 if (left > PAGE_SIZE - 1)
2531 left = PAGE_SIZE - 1;
2533 page = __get_free_page(GFP_TEMPORARY);
2534 kbuf = (char *) page;
2537 if (copy_from_user(kbuf, buffer, left)) {
2543 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2549 proc_skip_char(&kbuf, &left, '\n');
2550 while (!err && left) {
2551 unsigned long val_a, val_b;
2554 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2558 if (val_a >= bitmap_len || neg) {
2570 err = proc_get_long(&kbuf, &left, &val_b,
2571 &neg, tr_b, sizeof(tr_b),
2575 if (val_b >= bitmap_len || neg ||
2586 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2588 proc_skip_char(&kbuf, &left, '\n');
2592 unsigned long bit_a, bit_b = 0;
2595 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2596 if (bit_a >= bitmap_len)
2598 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2602 err = proc_put_char(&buffer, &left, ',');
2606 err = proc_put_long(&buffer, &left, bit_a, false);
2609 if (bit_a != bit_b) {
2610 err = proc_put_char(&buffer, &left, '-');
2613 err = proc_put_long(&buffer, &left, bit_b, false);
2621 err = proc_put_char(&buffer, &left, '\n');
2627 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2629 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2641 #else /* CONFIG_PROC_SYSCTL */
2643 int proc_dostring(struct ctl_table *table, int write,
2644 void __user *buffer, size_t *lenp, loff_t *ppos)
2649 int proc_dointvec(struct ctl_table *table, int write,
2650 void __user *buffer, size_t *lenp, loff_t *ppos)
2655 int proc_dointvec_minmax(struct ctl_table *table, int write,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2661 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2662 void __user *buffer, size_t *lenp, loff_t *ppos)
2667 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2668 void __user *buffer, size_t *lenp, loff_t *ppos)
2673 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2674 void __user *buffer, size_t *lenp, loff_t *ppos)
2679 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2680 void __user *buffer, size_t *lenp, loff_t *ppos)
2685 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2686 void __user *buffer,
2687 size_t *lenp, loff_t *ppos)
2693 #endif /* CONFIG_PROC_SYSCTL */
2696 * No sense putting this after each symbol definition, twice,
2697 * exception granted :-)
2699 EXPORT_SYMBOL(proc_dointvec);
2700 EXPORT_SYMBOL(proc_dointvec_jiffies);
2701 EXPORT_SYMBOL(proc_dointvec_minmax);
2702 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2703 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2704 EXPORT_SYMBOL(proc_dostring);
2705 EXPORT_SYMBOL(proc_doulongvec_minmax);
2706 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);