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",
390 .data = NULL, /* filled in by handler */
391 .maxlen = sizeof(unsigned int),
393 .proc_handler = sysctl_numa_balancing,
397 #endif /* CONFIG_NUMA_BALANCING */
398 #endif /* CONFIG_SCHED_DEBUG */
400 .procname = "sched_rt_period_us",
401 .data = &sysctl_sched_rt_period,
402 .maxlen = sizeof(unsigned int),
404 .proc_handler = sched_rt_handler,
407 .procname = "sched_rt_runtime_us",
408 .data = &sysctl_sched_rt_runtime,
409 .maxlen = sizeof(int),
411 .proc_handler = sched_rt_handler,
414 .procname = "sched_rr_timeslice_ms",
415 .data = &sched_rr_timeslice,
416 .maxlen = sizeof(int),
418 .proc_handler = sched_rr_handler,
420 #ifdef CONFIG_SCHED_AUTOGROUP
422 .procname = "sched_autogroup_enabled",
423 .data = &sysctl_sched_autogroup_enabled,
424 .maxlen = sizeof(unsigned int),
426 .proc_handler = proc_dointvec_minmax,
431 #ifdef CONFIG_CFS_BANDWIDTH
433 .procname = "sched_cfs_bandwidth_slice_us",
434 .data = &sysctl_sched_cfs_bandwidth_slice,
435 .maxlen = sizeof(unsigned int),
437 .proc_handler = proc_dointvec_minmax,
441 #ifdef CONFIG_PROVE_LOCKING
443 .procname = "prove_locking",
444 .data = &prove_locking,
445 .maxlen = sizeof(int),
447 .proc_handler = proc_dointvec,
450 #ifdef CONFIG_LOCK_STAT
452 .procname = "lock_stat",
454 .maxlen = sizeof(int),
456 .proc_handler = proc_dointvec,
461 .data = &panic_timeout,
462 .maxlen = sizeof(int),
464 .proc_handler = proc_dointvec,
466 #ifdef CONFIG_COREDUMP
468 .procname = "core_uses_pid",
469 .data = &core_uses_pid,
470 .maxlen = sizeof(int),
472 .proc_handler = proc_dointvec,
475 .procname = "core_pattern",
476 .data = core_pattern,
477 .maxlen = CORENAME_MAX_SIZE,
479 .proc_handler = proc_dostring_coredump,
482 .procname = "core_pipe_limit",
483 .data = &core_pipe_limit,
484 .maxlen = sizeof(unsigned int),
486 .proc_handler = proc_dointvec,
489 #ifdef CONFIG_PROC_SYSCTL
491 .procname = "tainted",
492 .maxlen = sizeof(long),
494 .proc_handler = proc_taint,
497 #ifdef CONFIG_LATENCYTOP
499 .procname = "latencytop",
500 .data = &latencytop_enabled,
501 .maxlen = sizeof(int),
503 .proc_handler = proc_dointvec,
506 #ifdef CONFIG_BLK_DEV_INITRD
508 .procname = "real-root-dev",
509 .data = &real_root_dev,
510 .maxlen = sizeof(int),
512 .proc_handler = proc_dointvec,
516 .procname = "print-fatal-signals",
517 .data = &print_fatal_signals,
518 .maxlen = sizeof(int),
520 .proc_handler = proc_dointvec,
524 .procname = "reboot-cmd",
525 .data = reboot_command,
528 .proc_handler = proc_dostring,
531 .procname = "stop-a",
532 .data = &stop_a_enabled,
533 .maxlen = sizeof (int),
535 .proc_handler = proc_dointvec,
538 .procname = "scons-poweroff",
539 .data = &scons_pwroff,
540 .maxlen = sizeof (int),
542 .proc_handler = proc_dointvec,
545 #ifdef CONFIG_SPARC64
547 .procname = "tsb-ratio",
548 .data = &sysctl_tsb_ratio,
549 .maxlen = sizeof (int),
551 .proc_handler = proc_dointvec,
556 .procname = "soft-power",
557 .data = &pwrsw_enabled,
558 .maxlen = sizeof (int),
560 .proc_handler = proc_dointvec,
563 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
565 .procname = "unaligned-trap",
566 .data = &unaligned_enabled,
567 .maxlen = sizeof (int),
569 .proc_handler = proc_dointvec,
573 .procname = "ctrl-alt-del",
575 .maxlen = sizeof(int),
577 .proc_handler = proc_dointvec,
579 #ifdef CONFIG_FUNCTION_TRACER
581 .procname = "ftrace_enabled",
582 .data = &ftrace_enabled,
583 .maxlen = sizeof(int),
585 .proc_handler = ftrace_enable_sysctl,
588 #ifdef CONFIG_STACK_TRACER
590 .procname = "stack_tracer_enabled",
591 .data = &stack_tracer_enabled,
592 .maxlen = sizeof(int),
594 .proc_handler = stack_trace_sysctl,
597 #ifdef CONFIG_TRACING
599 .procname = "ftrace_dump_on_oops",
600 .data = &ftrace_dump_on_oops,
601 .maxlen = sizeof(int),
603 .proc_handler = proc_dointvec,
606 .procname = "traceoff_on_warning",
607 .data = &__disable_trace_on_warning,
608 .maxlen = sizeof(__disable_trace_on_warning),
610 .proc_handler = proc_dointvec,
615 .procname = "kexec_load_disabled",
616 .data = &kexec_load_disabled,
617 .maxlen = sizeof(int),
619 /* only handle a transition from default "0" to "1" */
620 .proc_handler = proc_dointvec_minmax,
625 #ifdef CONFIG_MODULES
627 .procname = "modprobe",
628 .data = &modprobe_path,
629 .maxlen = KMOD_PATH_LEN,
631 .proc_handler = proc_dostring,
634 .procname = "modules_disabled",
635 .data = &modules_disabled,
636 .maxlen = sizeof(int),
638 /* only handle a transition from default "0" to "1" */
639 .proc_handler = proc_dointvec_minmax,
646 .procname = "hotplug",
647 .data = &uevent_helper,
648 .maxlen = UEVENT_HELPER_PATH_LEN,
650 .proc_handler = proc_dostring,
653 #ifdef CONFIG_CHR_DEV_SG
655 .procname = "sg-big-buff",
656 .data = &sg_big_buff,
657 .maxlen = sizeof (int),
659 .proc_handler = proc_dointvec,
662 #ifdef CONFIG_BSD_PROCESS_ACCT
666 .maxlen = 3*sizeof(int),
668 .proc_handler = proc_dointvec,
671 #ifdef CONFIG_MAGIC_SYSRQ
674 .data = &__sysrq_enabled,
675 .maxlen = sizeof (int),
677 .proc_handler = sysrq_sysctl_handler,
680 #ifdef CONFIG_PROC_SYSCTL
682 .procname = "cad_pid",
684 .maxlen = sizeof (int),
686 .proc_handler = proc_do_cad_pid,
690 .procname = "threads-max",
691 .data = &max_threads,
692 .maxlen = sizeof(int),
694 .proc_handler = proc_dointvec,
697 .procname = "random",
699 .child = random_table,
702 .procname = "usermodehelper",
704 .child = usermodehelper_table,
707 .procname = "overflowuid",
708 .data = &overflowuid,
709 .maxlen = sizeof(int),
711 .proc_handler = proc_dointvec_minmax,
712 .extra1 = &minolduid,
713 .extra2 = &maxolduid,
716 .procname = "overflowgid",
717 .data = &overflowgid,
718 .maxlen = sizeof(int),
720 .proc_handler = proc_dointvec_minmax,
721 .extra1 = &minolduid,
722 .extra2 = &maxolduid,
725 #ifdef CONFIG_MATHEMU
727 .procname = "ieee_emulation_warnings",
728 .data = &sysctl_ieee_emulation_warnings,
729 .maxlen = sizeof(int),
731 .proc_handler = proc_dointvec,
735 .procname = "userprocess_debug",
736 .data = &show_unhandled_signals,
737 .maxlen = sizeof(int),
739 .proc_handler = proc_dointvec,
743 .procname = "pid_max",
745 .maxlen = sizeof (int),
747 .proc_handler = proc_dointvec_minmax,
748 .extra1 = &pid_max_min,
749 .extra2 = &pid_max_max,
752 .procname = "panic_on_oops",
753 .data = &panic_on_oops,
754 .maxlen = sizeof(int),
756 .proc_handler = proc_dointvec,
758 #if defined CONFIG_PRINTK
760 .procname = "printk",
761 .data = &console_loglevel,
762 .maxlen = 4*sizeof(int),
764 .proc_handler = proc_dointvec,
767 .procname = "printk_ratelimit",
768 .data = &printk_ratelimit_state.interval,
769 .maxlen = sizeof(int),
771 .proc_handler = proc_dointvec_jiffies,
774 .procname = "printk_ratelimit_burst",
775 .data = &printk_ratelimit_state.burst,
776 .maxlen = sizeof(int),
778 .proc_handler = proc_dointvec,
781 .procname = "printk_delay",
782 .data = &printk_delay_msec,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec_minmax,
787 .extra2 = &ten_thousand,
790 .procname = "dmesg_restrict",
791 .data = &dmesg_restrict,
792 .maxlen = sizeof(int),
794 .proc_handler = proc_dointvec_minmax_sysadmin,
799 .procname = "kptr_restrict",
800 .data = &kptr_restrict,
801 .maxlen = sizeof(int),
803 .proc_handler = proc_dointvec_minmax_sysadmin,
809 .procname = "ngroups_max",
810 .data = &ngroups_max,
811 .maxlen = sizeof (int),
813 .proc_handler = proc_dointvec,
816 .procname = "cap_last_cap",
817 .data = (void *)&cap_last_cap,
818 .maxlen = sizeof(int),
820 .proc_handler = proc_dointvec,
822 #if defined(CONFIG_LOCKUP_DETECTOR)
824 .procname = "watchdog",
825 .data = &watchdog_user_enabled,
826 .maxlen = sizeof (int),
828 .proc_handler = proc_dowatchdog,
833 .procname = "watchdog_thresh",
834 .data = &watchdog_thresh,
835 .maxlen = sizeof(int),
837 .proc_handler = proc_dowatchdog,
842 .procname = "softlockup_panic",
843 .data = &softlockup_panic,
844 .maxlen = sizeof(int),
846 .proc_handler = proc_dointvec_minmax,
851 .procname = "nmi_watchdog",
852 .data = &watchdog_user_enabled,
853 .maxlen = sizeof (int),
855 .proc_handler = proc_dowatchdog,
860 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
862 .procname = "unknown_nmi_panic",
863 .data = &unknown_nmi_panic,
864 .maxlen = sizeof (int),
866 .proc_handler = proc_dointvec,
869 #if defined(CONFIG_X86)
871 .procname = "panic_on_unrecovered_nmi",
872 .data = &panic_on_unrecovered_nmi,
873 .maxlen = sizeof(int),
875 .proc_handler = proc_dointvec,
878 .procname = "panic_on_io_nmi",
879 .data = &panic_on_io_nmi,
880 .maxlen = sizeof(int),
882 .proc_handler = proc_dointvec,
884 #ifdef CONFIG_DEBUG_STACKOVERFLOW
886 .procname = "panic_on_stackoverflow",
887 .data = &sysctl_panic_on_stackoverflow,
888 .maxlen = sizeof(int),
890 .proc_handler = proc_dointvec,
894 .procname = "bootloader_type",
895 .data = &bootloader_type,
896 .maxlen = sizeof (int),
898 .proc_handler = proc_dointvec,
901 .procname = "bootloader_version",
902 .data = &bootloader_version,
903 .maxlen = sizeof (int),
905 .proc_handler = proc_dointvec,
908 .procname = "kstack_depth_to_print",
909 .data = &kstack_depth_to_print,
910 .maxlen = sizeof(int),
912 .proc_handler = proc_dointvec,
915 .procname = "io_delay_type",
916 .data = &io_delay_type,
917 .maxlen = sizeof(int),
919 .proc_handler = proc_dointvec,
922 #if defined(CONFIG_MMU)
924 .procname = "randomize_va_space",
925 .data = &randomize_va_space,
926 .maxlen = sizeof(int),
928 .proc_handler = proc_dointvec,
931 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
933 .procname = "spin_retry",
935 .maxlen = sizeof (int),
937 .proc_handler = proc_dointvec,
940 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
942 .procname = "acpi_video_flags",
943 .data = &acpi_realmode_flags,
944 .maxlen = sizeof (unsigned long),
946 .proc_handler = proc_doulongvec_minmax,
949 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
951 .procname = "ignore-unaligned-usertrap",
952 .data = &no_unaligned_warning,
953 .maxlen = sizeof (int),
955 .proc_handler = proc_dointvec,
960 .procname = "unaligned-dump-stack",
961 .data = &unaligned_dump_stack,
962 .maxlen = sizeof (int),
964 .proc_handler = proc_dointvec,
967 #ifdef CONFIG_DETECT_HUNG_TASK
969 .procname = "hung_task_panic",
970 .data = &sysctl_hung_task_panic,
971 .maxlen = sizeof(int),
973 .proc_handler = proc_dointvec_minmax,
978 .procname = "hung_task_check_count",
979 .data = &sysctl_hung_task_check_count,
980 .maxlen = sizeof(int),
982 .proc_handler = proc_dointvec_minmax,
986 .procname = "hung_task_timeout_secs",
987 .data = &sysctl_hung_task_timeout_secs,
988 .maxlen = sizeof(unsigned long),
990 .proc_handler = proc_dohung_task_timeout_secs,
993 .procname = "hung_task_warnings",
994 .data = &sysctl_hung_task_warnings,
995 .maxlen = sizeof(int),
997 .proc_handler = proc_dointvec_minmax,
1001 #ifdef CONFIG_COMPAT
1003 .procname = "compat-log",
1004 .data = &compat_log,
1005 .maxlen = sizeof (int),
1007 .proc_handler = proc_dointvec,
1010 #ifdef CONFIG_RT_MUTEXES
1012 .procname = "max_lock_depth",
1013 .data = &max_lock_depth,
1014 .maxlen = sizeof(int),
1016 .proc_handler = proc_dointvec,
1020 .procname = "poweroff_cmd",
1021 .data = &poweroff_cmd,
1022 .maxlen = POWEROFF_CMD_PATH_LEN,
1024 .proc_handler = proc_dostring,
1030 .child = key_sysctls,
1033 #ifdef CONFIG_RCU_TORTURE_TEST
1035 .procname = "rcutorture_runnable",
1036 .data = &rcutorture_runnable,
1037 .maxlen = sizeof(int),
1039 .proc_handler = proc_dointvec,
1042 #ifdef CONFIG_PERF_EVENTS
1044 * User-space scripts rely on the existence of this file
1045 * as a feature check for perf_events being enabled.
1047 * So it's an ABI, do not remove!
1050 .procname = "perf_event_paranoid",
1051 .data = &sysctl_perf_event_paranoid,
1052 .maxlen = sizeof(sysctl_perf_event_paranoid),
1054 .proc_handler = proc_dointvec,
1057 .procname = "perf_event_mlock_kb",
1058 .data = &sysctl_perf_event_mlock,
1059 .maxlen = sizeof(sysctl_perf_event_mlock),
1061 .proc_handler = proc_dointvec,
1064 .procname = "perf_event_max_sample_rate",
1065 .data = &sysctl_perf_event_sample_rate,
1066 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1068 .proc_handler = perf_proc_update_handler,
1072 .procname = "perf_cpu_time_max_percent",
1073 .data = &sysctl_perf_cpu_time_max_percent,
1074 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1076 .proc_handler = perf_cpu_time_max_percent_handler,
1078 .extra2 = &one_hundred,
1081 #ifdef CONFIG_KMEMCHECK
1083 .procname = "kmemcheck",
1084 .data = &kmemcheck_enabled,
1085 .maxlen = sizeof(int),
1087 .proc_handler = proc_dointvec,
1092 .procname = "blk_iopoll",
1093 .data = &blk_iopoll_enabled,
1094 .maxlen = sizeof(int),
1096 .proc_handler = proc_dointvec,
1102 static struct ctl_table vm_table[] = {
1104 .procname = "overcommit_memory",
1105 .data = &sysctl_overcommit_memory,
1106 .maxlen = sizeof(sysctl_overcommit_memory),
1108 .proc_handler = proc_dointvec_minmax,
1113 .procname = "panic_on_oom",
1114 .data = &sysctl_panic_on_oom,
1115 .maxlen = sizeof(sysctl_panic_on_oom),
1117 .proc_handler = proc_dointvec_minmax,
1122 .procname = "oom_kill_allocating_task",
1123 .data = &sysctl_oom_kill_allocating_task,
1124 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1126 .proc_handler = proc_dointvec,
1129 .procname = "oom_dump_tasks",
1130 .data = &sysctl_oom_dump_tasks,
1131 .maxlen = sizeof(sysctl_oom_dump_tasks),
1133 .proc_handler = proc_dointvec,
1136 .procname = "overcommit_ratio",
1137 .data = &sysctl_overcommit_ratio,
1138 .maxlen = sizeof(sysctl_overcommit_ratio),
1140 .proc_handler = overcommit_ratio_handler,
1143 .procname = "overcommit_kbytes",
1144 .data = &sysctl_overcommit_kbytes,
1145 .maxlen = sizeof(sysctl_overcommit_kbytes),
1147 .proc_handler = overcommit_kbytes_handler,
1150 .procname = "page-cluster",
1151 .data = &page_cluster,
1152 .maxlen = sizeof(int),
1154 .proc_handler = proc_dointvec_minmax,
1158 .procname = "dirty_background_ratio",
1159 .data = &dirty_background_ratio,
1160 .maxlen = sizeof(dirty_background_ratio),
1162 .proc_handler = dirty_background_ratio_handler,
1164 .extra2 = &one_hundred,
1167 .procname = "dirty_background_bytes",
1168 .data = &dirty_background_bytes,
1169 .maxlen = sizeof(dirty_background_bytes),
1171 .proc_handler = dirty_background_bytes_handler,
1175 .procname = "dirty_ratio",
1176 .data = &vm_dirty_ratio,
1177 .maxlen = sizeof(vm_dirty_ratio),
1179 .proc_handler = dirty_ratio_handler,
1181 .extra2 = &one_hundred,
1184 .procname = "dirty_bytes",
1185 .data = &vm_dirty_bytes,
1186 .maxlen = sizeof(vm_dirty_bytes),
1188 .proc_handler = dirty_bytes_handler,
1189 .extra1 = &dirty_bytes_min,
1192 .procname = "dirty_writeback_centisecs",
1193 .data = &dirty_writeback_interval,
1194 .maxlen = sizeof(dirty_writeback_interval),
1196 .proc_handler = dirty_writeback_centisecs_handler,
1199 .procname = "dirty_expire_centisecs",
1200 .data = &dirty_expire_interval,
1201 .maxlen = sizeof(dirty_expire_interval),
1203 .proc_handler = proc_dointvec_minmax,
1207 .procname = "nr_pdflush_threads",
1208 .mode = 0444 /* read-only */,
1209 .proc_handler = pdflush_proc_obsolete,
1212 .procname = "swappiness",
1213 .data = &vm_swappiness,
1214 .maxlen = sizeof(vm_swappiness),
1216 .proc_handler = proc_dointvec_minmax,
1218 .extra2 = &one_hundred,
1220 #ifdef CONFIG_HUGETLB_PAGE
1222 .procname = "nr_hugepages",
1224 .maxlen = sizeof(unsigned long),
1226 .proc_handler = hugetlb_sysctl_handler,
1227 .extra1 = (void *)&hugetlb_zero,
1228 .extra2 = (void *)&hugetlb_infinity,
1232 .procname = "nr_hugepages_mempolicy",
1234 .maxlen = sizeof(unsigned long),
1236 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1237 .extra1 = (void *)&hugetlb_zero,
1238 .extra2 = (void *)&hugetlb_infinity,
1242 .procname = "hugetlb_shm_group",
1243 .data = &sysctl_hugetlb_shm_group,
1244 .maxlen = sizeof(gid_t),
1246 .proc_handler = proc_dointvec,
1249 .procname = "hugepages_treat_as_movable",
1250 .data = &hugepages_treat_as_movable,
1251 .maxlen = sizeof(int),
1253 .proc_handler = proc_dointvec,
1256 .procname = "nr_overcommit_hugepages",
1258 .maxlen = sizeof(unsigned long),
1260 .proc_handler = hugetlb_overcommit_handler,
1261 .extra1 = (void *)&hugetlb_zero,
1262 .extra2 = (void *)&hugetlb_infinity,
1266 .procname = "lowmem_reserve_ratio",
1267 .data = &sysctl_lowmem_reserve_ratio,
1268 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1270 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1273 .procname = "drop_caches",
1274 .data = &sysctl_drop_caches,
1275 .maxlen = sizeof(int),
1277 .proc_handler = drop_caches_sysctl_handler,
1281 #ifdef CONFIG_COMPACTION
1283 .procname = "compact_memory",
1284 .data = &sysctl_compact_memory,
1285 .maxlen = sizeof(int),
1287 .proc_handler = sysctl_compaction_handler,
1290 .procname = "extfrag_threshold",
1291 .data = &sysctl_extfrag_threshold,
1292 .maxlen = sizeof(int),
1294 .proc_handler = sysctl_extfrag_handler,
1295 .extra1 = &min_extfrag_threshold,
1296 .extra2 = &max_extfrag_threshold,
1299 #endif /* CONFIG_COMPACTION */
1301 .procname = "min_free_kbytes",
1302 .data = &min_free_kbytes,
1303 .maxlen = sizeof(min_free_kbytes),
1305 .proc_handler = min_free_kbytes_sysctl_handler,
1309 .procname = "percpu_pagelist_fraction",
1310 .data = &percpu_pagelist_fraction,
1311 .maxlen = sizeof(percpu_pagelist_fraction),
1313 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1314 .extra1 = &min_percpu_pagelist_fract,
1318 .procname = "max_map_count",
1319 .data = &sysctl_max_map_count,
1320 .maxlen = sizeof(sysctl_max_map_count),
1322 .proc_handler = proc_dointvec_minmax,
1327 .procname = "nr_trim_pages",
1328 .data = &sysctl_nr_trim_pages,
1329 .maxlen = sizeof(sysctl_nr_trim_pages),
1331 .proc_handler = proc_dointvec_minmax,
1336 .procname = "laptop_mode",
1337 .data = &laptop_mode,
1338 .maxlen = sizeof(laptop_mode),
1340 .proc_handler = proc_dointvec_jiffies,
1343 .procname = "block_dump",
1344 .data = &block_dump,
1345 .maxlen = sizeof(block_dump),
1347 .proc_handler = proc_dointvec,
1351 .procname = "vfs_cache_pressure",
1352 .data = &sysctl_vfs_cache_pressure,
1353 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1355 .proc_handler = proc_dointvec,
1358 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1360 .procname = "legacy_va_layout",
1361 .data = &sysctl_legacy_va_layout,
1362 .maxlen = sizeof(sysctl_legacy_va_layout),
1364 .proc_handler = proc_dointvec,
1370 .procname = "zone_reclaim_mode",
1371 .data = &zone_reclaim_mode,
1372 .maxlen = sizeof(zone_reclaim_mode),
1374 .proc_handler = proc_dointvec,
1378 .procname = "min_unmapped_ratio",
1379 .data = &sysctl_min_unmapped_ratio,
1380 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1382 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1384 .extra2 = &one_hundred,
1387 .procname = "min_slab_ratio",
1388 .data = &sysctl_min_slab_ratio,
1389 .maxlen = sizeof(sysctl_min_slab_ratio),
1391 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1393 .extra2 = &one_hundred,
1398 .procname = "stat_interval",
1399 .data = &sysctl_stat_interval,
1400 .maxlen = sizeof(sysctl_stat_interval),
1402 .proc_handler = proc_dointvec_jiffies,
1407 .procname = "mmap_min_addr",
1408 .data = &dac_mmap_min_addr,
1409 .maxlen = sizeof(unsigned long),
1411 .proc_handler = mmap_min_addr_handler,
1416 .procname = "numa_zonelist_order",
1417 .data = &numa_zonelist_order,
1418 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1420 .proc_handler = numa_zonelist_order_handler,
1423 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1424 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1426 .procname = "vdso_enabled",
1427 .data = &vdso_enabled,
1428 .maxlen = sizeof(vdso_enabled),
1430 .proc_handler = proc_dointvec,
1434 #ifdef CONFIG_HIGHMEM
1436 .procname = "highmem_is_dirtyable",
1437 .data = &vm_highmem_is_dirtyable,
1438 .maxlen = sizeof(vm_highmem_is_dirtyable),
1440 .proc_handler = proc_dointvec_minmax,
1446 .procname = "scan_unevictable_pages",
1447 .data = &scan_unevictable_pages,
1448 .maxlen = sizeof(scan_unevictable_pages),
1450 .proc_handler = scan_unevictable_handler,
1452 #ifdef CONFIG_MEMORY_FAILURE
1454 .procname = "memory_failure_early_kill",
1455 .data = &sysctl_memory_failure_early_kill,
1456 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1458 .proc_handler = proc_dointvec_minmax,
1463 .procname = "memory_failure_recovery",
1464 .data = &sysctl_memory_failure_recovery,
1465 .maxlen = sizeof(sysctl_memory_failure_recovery),
1467 .proc_handler = proc_dointvec_minmax,
1473 .procname = "user_reserve_kbytes",
1474 .data = &sysctl_user_reserve_kbytes,
1475 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1477 .proc_handler = proc_doulongvec_minmax,
1480 .procname = "admin_reserve_kbytes",
1481 .data = &sysctl_admin_reserve_kbytes,
1482 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1484 .proc_handler = proc_doulongvec_minmax,
1489 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1490 static struct ctl_table binfmt_misc_table[] = {
1495 static struct ctl_table fs_table[] = {
1497 .procname = "inode-nr",
1498 .data = &inodes_stat,
1499 .maxlen = 2*sizeof(long),
1501 .proc_handler = proc_nr_inodes,
1504 .procname = "inode-state",
1505 .data = &inodes_stat,
1506 .maxlen = 7*sizeof(long),
1508 .proc_handler = proc_nr_inodes,
1511 .procname = "file-nr",
1512 .data = &files_stat,
1513 .maxlen = sizeof(files_stat),
1515 .proc_handler = proc_nr_files,
1518 .procname = "file-max",
1519 .data = &files_stat.max_files,
1520 .maxlen = sizeof(files_stat.max_files),
1522 .proc_handler = proc_doulongvec_minmax,
1525 .procname = "nr_open",
1526 .data = &sysctl_nr_open,
1527 .maxlen = sizeof(int),
1529 .proc_handler = proc_dointvec_minmax,
1530 .extra1 = &sysctl_nr_open_min,
1531 .extra2 = &sysctl_nr_open_max,
1534 .procname = "dentry-state",
1535 .data = &dentry_stat,
1536 .maxlen = 6*sizeof(long),
1538 .proc_handler = proc_nr_dentry,
1541 .procname = "overflowuid",
1542 .data = &fs_overflowuid,
1543 .maxlen = sizeof(int),
1545 .proc_handler = proc_dointvec_minmax,
1546 .extra1 = &minolduid,
1547 .extra2 = &maxolduid,
1550 .procname = "overflowgid",
1551 .data = &fs_overflowgid,
1552 .maxlen = sizeof(int),
1554 .proc_handler = proc_dointvec_minmax,
1555 .extra1 = &minolduid,
1556 .extra2 = &maxolduid,
1558 #ifdef CONFIG_FILE_LOCKING
1560 .procname = "leases-enable",
1561 .data = &leases_enable,
1562 .maxlen = sizeof(int),
1564 .proc_handler = proc_dointvec,
1567 #ifdef CONFIG_DNOTIFY
1569 .procname = "dir-notify-enable",
1570 .data = &dir_notify_enable,
1571 .maxlen = sizeof(int),
1573 .proc_handler = proc_dointvec,
1577 #ifdef CONFIG_FILE_LOCKING
1579 .procname = "lease-break-time",
1580 .data = &lease_break_time,
1581 .maxlen = sizeof(int),
1583 .proc_handler = proc_dointvec,
1588 .procname = "aio-nr",
1590 .maxlen = sizeof(aio_nr),
1592 .proc_handler = proc_doulongvec_minmax,
1595 .procname = "aio-max-nr",
1596 .data = &aio_max_nr,
1597 .maxlen = sizeof(aio_max_nr),
1599 .proc_handler = proc_doulongvec_minmax,
1601 #endif /* CONFIG_AIO */
1602 #ifdef CONFIG_INOTIFY_USER
1604 .procname = "inotify",
1606 .child = inotify_table,
1611 .procname = "epoll",
1613 .child = epoll_table,
1618 .procname = "protected_symlinks",
1619 .data = &sysctl_protected_symlinks,
1620 .maxlen = sizeof(int),
1622 .proc_handler = proc_dointvec_minmax,
1627 .procname = "protected_hardlinks",
1628 .data = &sysctl_protected_hardlinks,
1629 .maxlen = sizeof(int),
1631 .proc_handler = proc_dointvec_minmax,
1636 .procname = "suid_dumpable",
1637 .data = &suid_dumpable,
1638 .maxlen = sizeof(int),
1640 .proc_handler = proc_dointvec_minmax_coredump,
1644 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1646 .procname = "binfmt_misc",
1648 .child = binfmt_misc_table,
1652 .procname = "pipe-max-size",
1653 .data = &pipe_max_size,
1654 .maxlen = sizeof(int),
1656 .proc_handler = &pipe_proc_fn,
1657 .extra1 = &pipe_min_size,
1662 static struct ctl_table debug_table[] = {
1663 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1665 .procname = "exception-trace",
1666 .data = &show_unhandled_signals,
1667 .maxlen = sizeof(int),
1669 .proc_handler = proc_dointvec
1672 #if defined(CONFIG_OPTPROBES)
1674 .procname = "kprobes-optimization",
1675 .data = &sysctl_kprobes_optimization,
1676 .maxlen = sizeof(int),
1678 .proc_handler = proc_kprobes_optimization_handler,
1686 static struct ctl_table dev_table[] = {
1690 int __init sysctl_init(void)
1692 struct ctl_table_header *hdr;
1694 hdr = register_sysctl_table(sysctl_base_table);
1695 kmemleak_not_leak(hdr);
1699 #endif /* CONFIG_SYSCTL */
1705 #ifdef CONFIG_PROC_SYSCTL
1707 static int _proc_do_string(void* data, int maxlen, int write,
1708 void __user *buffer,
1709 size_t *lenp, loff_t *ppos)
1715 if (!data || !maxlen || !*lenp) {
1723 while (len < *lenp) {
1724 if (get_user(c, p++))
1726 if (c == 0 || c == '\n')
1732 if(copy_from_user(data, buffer, len))
1734 ((char *) data)[len] = 0;
1752 if(copy_to_user(buffer, data, len))
1755 if(put_user('\n', ((char __user *) buffer) + len))
1766 * proc_dostring - read a string sysctl
1767 * @table: the sysctl table
1768 * @write: %TRUE if this is a write to the sysctl file
1769 * @buffer: the user buffer
1770 * @lenp: the size of the user buffer
1771 * @ppos: file position
1773 * Reads/writes a string from/to the user buffer. If the kernel
1774 * buffer provided is not large enough to hold the string, the
1775 * string is truncated. The copied string is %NULL-terminated.
1776 * If the string is being read by the user process, it is copied
1777 * and a newline '\n' is added. It is truncated if the buffer is
1780 * Returns 0 on success.
1782 int proc_dostring(struct ctl_table *table, int write,
1783 void __user *buffer, size_t *lenp, loff_t *ppos)
1785 return _proc_do_string(table->data, table->maxlen, write,
1786 buffer, lenp, ppos);
1789 static size_t proc_skip_spaces(char **buf)
1792 char *tmp = skip_spaces(*buf);
1798 static void proc_skip_char(char **buf, size_t *size, const char v)
1808 #define TMPBUFLEN 22
1810 * proc_get_long - reads an ASCII formatted integer from a user buffer
1812 * @buf: a kernel buffer
1813 * @size: size of the kernel buffer
1814 * @val: this is where the number will be stored
1815 * @neg: set to %TRUE if number is negative
1816 * @perm_tr: a vector which contains the allowed trailers
1817 * @perm_tr_len: size of the perm_tr vector
1818 * @tr: pointer to store the trailer character
1820 * In case of success %0 is returned and @buf and @size are updated with
1821 * the amount of bytes read. If @tr is non-NULL and a trailing
1822 * character exists (size is non-zero after returning from this
1823 * function), @tr is updated with the trailing character.
1825 static int proc_get_long(char **buf, size_t *size,
1826 unsigned long *val, bool *neg,
1827 const char *perm_tr, unsigned perm_tr_len, char *tr)
1830 char *p, tmp[TMPBUFLEN];
1836 if (len > TMPBUFLEN - 1)
1837 len = TMPBUFLEN - 1;
1839 memcpy(tmp, *buf, len);
1843 if (*p == '-' && *size > 1) {
1851 *val = simple_strtoul(p, &p, 0);
1855 /* We don't know if the next char is whitespace thus we may accept
1856 * invalid integers (e.g. 1234...a) or two integers instead of one
1857 * (e.g. 123...1). So lets not allow such large numbers. */
1858 if (len == TMPBUFLEN - 1)
1861 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1864 if (tr && (len < *size))
1874 * proc_put_long - converts an integer to a decimal ASCII formatted string
1876 * @buf: the user buffer
1877 * @size: the size of the user buffer
1878 * @val: the integer to be converted
1879 * @neg: sign of the number, %TRUE for negative
1881 * In case of success %0 is returned and @buf and @size are updated with
1882 * the amount of bytes written.
1884 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1888 char tmp[TMPBUFLEN], *p = tmp;
1890 sprintf(p, "%s%lu", neg ? "-" : "", val);
1894 if (copy_to_user(*buf, tmp, len))
1902 static int proc_put_char(void __user **buf, size_t *size, char c)
1905 char __user **buffer = (char __user **)buf;
1906 if (put_user(c, *buffer))
1908 (*size)--, (*buffer)++;
1914 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1916 int write, void *data)
1919 *valp = *negp ? -*lvalp : *lvalp;
1924 *lvalp = (unsigned long)-val;
1927 *lvalp = (unsigned long)val;
1933 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1935 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1936 int write, void __user *buffer,
1937 size_t *lenp, loff_t *ppos,
1938 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1939 int write, void *data),
1942 int *i, vleft, first = 1, err = 0;
1943 unsigned long page = 0;
1947 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1952 i = (int *) tbl_data;
1953 vleft = table->maxlen / sizeof(*i);
1957 conv = do_proc_dointvec_conv;
1960 if (left > PAGE_SIZE - 1)
1961 left = PAGE_SIZE - 1;
1962 page = __get_free_page(GFP_TEMPORARY);
1963 kbuf = (char *) page;
1966 if (copy_from_user(kbuf, buffer, left)) {
1973 for (; left && vleft--; i++, first=0) {
1978 left -= proc_skip_spaces(&kbuf);
1982 err = proc_get_long(&kbuf, &left, &lval, &neg,
1984 sizeof(proc_wspace_sep), NULL);
1987 if (conv(&neg, &lval, i, 1, data)) {
1992 if (conv(&neg, &lval, i, 0, data)) {
1997 err = proc_put_char(&buffer, &left, '\t');
2000 err = proc_put_long(&buffer, &left, lval, neg);
2006 if (!write && !first && left && !err)
2007 err = proc_put_char(&buffer, &left, '\n');
2008 if (write && !err && left)
2009 left -= proc_skip_spaces(&kbuf);
2014 return err ? : -EINVAL;
2021 static int do_proc_dointvec(struct ctl_table *table, int write,
2022 void __user *buffer, size_t *lenp, loff_t *ppos,
2023 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2024 int write, void *data),
2027 return __do_proc_dointvec(table->data, table, write,
2028 buffer, lenp, ppos, conv, data);
2032 * proc_dointvec - read a vector of integers
2033 * @table: the sysctl table
2034 * @write: %TRUE if this is a write to the sysctl file
2035 * @buffer: the user buffer
2036 * @lenp: the size of the user buffer
2037 * @ppos: file position
2039 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2040 * values from/to the user buffer, treated as an ASCII string.
2042 * Returns 0 on success.
2044 int proc_dointvec(struct ctl_table *table, int write,
2045 void __user *buffer, size_t *lenp, loff_t *ppos)
2047 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2052 * Taint values can only be increased
2053 * This means we can safely use a temporary.
2055 static int proc_taint(struct ctl_table *table, int write,
2056 void __user *buffer, size_t *lenp, loff_t *ppos)
2059 unsigned long tmptaint = get_taint();
2062 if (write && !capable(CAP_SYS_ADMIN))
2067 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2073 * Poor man's atomic or. Not worth adding a primitive
2074 * to everyone's atomic.h for this
2077 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2078 if ((tmptaint >> i) & 1)
2079 add_taint(i, LOCKDEP_STILL_OK);
2086 #ifdef CONFIG_PRINTK
2087 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2088 void __user *buffer, size_t *lenp, loff_t *ppos)
2090 if (write && !capable(CAP_SYS_ADMIN))
2093 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2097 struct do_proc_dointvec_minmax_conv_param {
2102 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2104 int write, void *data)
2106 struct do_proc_dointvec_minmax_conv_param *param = data;
2108 int val = *negp ? -*lvalp : *lvalp;
2109 if ((param->min && *param->min > val) ||
2110 (param->max && *param->max < val))
2117 *lvalp = (unsigned long)-val;
2120 *lvalp = (unsigned long)val;
2127 * proc_dointvec_minmax - read a vector of integers with min/max values
2128 * @table: the sysctl table
2129 * @write: %TRUE if this is a write to the sysctl file
2130 * @buffer: the user buffer
2131 * @lenp: the size of the user buffer
2132 * @ppos: file position
2134 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2135 * values from/to the user buffer, treated as an ASCII string.
2137 * This routine will ensure the values are within the range specified by
2138 * table->extra1 (min) and table->extra2 (max).
2140 * Returns 0 on success.
2142 int proc_dointvec_minmax(struct ctl_table *table, int write,
2143 void __user *buffer, size_t *lenp, loff_t *ppos)
2145 struct do_proc_dointvec_minmax_conv_param param = {
2146 .min = (int *) table->extra1,
2147 .max = (int *) table->extra2,
2149 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2150 do_proc_dointvec_minmax_conv, ¶m);
2153 static void validate_coredump_safety(void)
2155 #ifdef CONFIG_COREDUMP
2156 if (suid_dumpable == SUID_DUMP_ROOT &&
2157 core_pattern[0] != '/' && core_pattern[0] != '|') {
2158 printk(KERN_WARNING "Unsafe core_pattern used with "\
2159 "suid_dumpable=2. Pipe handler or fully qualified "\
2160 "core dump path required.\n");
2165 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2166 void __user *buffer, size_t *lenp, loff_t *ppos)
2168 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2170 validate_coredump_safety();
2174 #ifdef CONFIG_COREDUMP
2175 static int proc_dostring_coredump(struct ctl_table *table, int write,
2176 void __user *buffer, size_t *lenp, loff_t *ppos)
2178 int error = proc_dostring(table, write, buffer, lenp, ppos);
2180 validate_coredump_safety();
2185 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2186 void __user *buffer,
2187 size_t *lenp, loff_t *ppos,
2188 unsigned long convmul,
2189 unsigned long convdiv)
2191 unsigned long *i, *min, *max;
2192 int vleft, first = 1, err = 0;
2193 unsigned long page = 0;
2197 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2202 i = (unsigned long *) data;
2203 min = (unsigned long *) table->extra1;
2204 max = (unsigned long *) table->extra2;
2205 vleft = table->maxlen / sizeof(unsigned long);
2209 if (left > PAGE_SIZE - 1)
2210 left = PAGE_SIZE - 1;
2211 page = __get_free_page(GFP_TEMPORARY);
2212 kbuf = (char *) page;
2215 if (copy_from_user(kbuf, buffer, left)) {
2222 for (; left && vleft--; i++, first = 0) {
2228 left -= proc_skip_spaces(&kbuf);
2230 err = proc_get_long(&kbuf, &left, &val, &neg,
2232 sizeof(proc_wspace_sep), NULL);
2237 if ((min && val < *min) || (max && val > *max))
2241 val = convdiv * (*i) / convmul;
2243 err = proc_put_char(&buffer, &left, '\t');
2247 err = proc_put_long(&buffer, &left, val, false);
2253 if (!write && !first && left && !err)
2254 err = proc_put_char(&buffer, &left, '\n');
2256 left -= proc_skip_spaces(&kbuf);
2261 return err ? : -EINVAL;
2268 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2269 void __user *buffer,
2270 size_t *lenp, loff_t *ppos,
2271 unsigned long convmul,
2272 unsigned long convdiv)
2274 return __do_proc_doulongvec_minmax(table->data, table, write,
2275 buffer, lenp, ppos, convmul, convdiv);
2279 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2280 * @table: the sysctl table
2281 * @write: %TRUE if this is a write to the sysctl file
2282 * @buffer: the user buffer
2283 * @lenp: the size of the user buffer
2284 * @ppos: file position
2286 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2287 * values from/to the user buffer, treated as an ASCII string.
2289 * This routine will ensure the values are within the range specified by
2290 * table->extra1 (min) and table->extra2 (max).
2292 * Returns 0 on success.
2294 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2295 void __user *buffer, size_t *lenp, loff_t *ppos)
2297 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2301 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2302 * @table: the sysctl table
2303 * @write: %TRUE if this is a write to the sysctl file
2304 * @buffer: the user buffer
2305 * @lenp: the size of the user buffer
2306 * @ppos: file position
2308 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2309 * values from/to the user buffer, treated as an ASCII string. The values
2310 * are treated as milliseconds, and converted to jiffies when they are stored.
2312 * This routine will ensure the values are within the range specified by
2313 * table->extra1 (min) and table->extra2 (max).
2315 * Returns 0 on success.
2317 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2318 void __user *buffer,
2319 size_t *lenp, loff_t *ppos)
2321 return do_proc_doulongvec_minmax(table, write, buffer,
2322 lenp, ppos, HZ, 1000l);
2326 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2328 int write, void *data)
2331 if (*lvalp > LONG_MAX / HZ)
2333 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2339 lval = (unsigned long)-val;
2342 lval = (unsigned long)val;
2349 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2351 int write, void *data)
2354 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2356 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2362 lval = (unsigned long)-val;
2365 lval = (unsigned long)val;
2367 *lvalp = jiffies_to_clock_t(lval);
2372 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2374 int write, void *data)
2377 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2387 lval = (unsigned long)-val;
2390 lval = (unsigned long)val;
2392 *lvalp = jiffies_to_msecs(lval);
2398 * proc_dointvec_jiffies - read a vector of integers as seconds
2399 * @table: the sysctl table
2400 * @write: %TRUE if this is a write to the sysctl file
2401 * @buffer: the user buffer
2402 * @lenp: the size of the user buffer
2403 * @ppos: file position
2405 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2406 * values from/to the user buffer, treated as an ASCII string.
2407 * The values read are assumed to be in seconds, and are converted into
2410 * Returns 0 on success.
2412 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2413 void __user *buffer, size_t *lenp, loff_t *ppos)
2415 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2416 do_proc_dointvec_jiffies_conv,NULL);
2420 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2421 * @table: the sysctl table
2422 * @write: %TRUE if this is a write to the sysctl file
2423 * @buffer: the user buffer
2424 * @lenp: the size of the user buffer
2425 * @ppos: pointer to the file position
2427 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2428 * values from/to the user buffer, treated as an ASCII string.
2429 * The values read are assumed to be in 1/USER_HZ seconds, and
2430 * are converted into jiffies.
2432 * Returns 0 on success.
2434 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2435 void __user *buffer, size_t *lenp, loff_t *ppos)
2437 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2438 do_proc_dointvec_userhz_jiffies_conv,NULL);
2442 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2443 * @table: the sysctl table
2444 * @write: %TRUE if this is a write to the sysctl file
2445 * @buffer: the user buffer
2446 * @lenp: the size of the user buffer
2447 * @ppos: file position
2448 * @ppos: the current position in the file
2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2451 * values from/to the user buffer, treated as an ASCII string.
2452 * The values read are assumed to be in 1/1000 seconds, and
2453 * are converted into jiffies.
2455 * Returns 0 on success.
2457 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2458 void __user *buffer, size_t *lenp, loff_t *ppos)
2460 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2461 do_proc_dointvec_ms_jiffies_conv, NULL);
2464 static int proc_do_cad_pid(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2467 struct pid *new_pid;
2471 tmp = pid_vnr(cad_pid);
2473 r = __do_proc_dointvec(&tmp, table, write, buffer,
2474 lenp, ppos, NULL, NULL);
2478 new_pid = find_get_pid(tmp);
2482 put_pid(xchg(&cad_pid, new_pid));
2487 * proc_do_large_bitmap - read/write from/to a large bitmap
2488 * @table: the sysctl table
2489 * @write: %TRUE if this is a write to the sysctl file
2490 * @buffer: the user buffer
2491 * @lenp: the size of the user buffer
2492 * @ppos: file position
2494 * The bitmap is stored at table->data and the bitmap length (in bits)
2497 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2498 * large bitmaps may be represented in a compact manner. Writing into
2499 * the file will clear the bitmap then update it with the given input.
2501 * Returns 0 on success.
2503 int proc_do_large_bitmap(struct ctl_table *table, int write,
2504 void __user *buffer, size_t *lenp, loff_t *ppos)
2508 size_t left = *lenp;
2509 unsigned long bitmap_len = table->maxlen;
2510 unsigned long *bitmap = (unsigned long *) table->data;
2511 unsigned long *tmp_bitmap = NULL;
2512 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2514 if (!bitmap_len || !left || (*ppos && !write)) {
2520 unsigned long page = 0;
2523 if (left > PAGE_SIZE - 1)
2524 left = PAGE_SIZE - 1;
2526 page = __get_free_page(GFP_TEMPORARY);
2527 kbuf = (char *) page;
2530 if (copy_from_user(kbuf, buffer, left)) {
2536 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2542 proc_skip_char(&kbuf, &left, '\n');
2543 while (!err && left) {
2544 unsigned long val_a, val_b;
2547 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2551 if (val_a >= bitmap_len || neg) {
2563 err = proc_get_long(&kbuf, &left, &val_b,
2564 &neg, tr_b, sizeof(tr_b),
2568 if (val_b >= bitmap_len || neg ||
2579 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2581 proc_skip_char(&kbuf, &left, '\n');
2585 unsigned long bit_a, bit_b = 0;
2588 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2589 if (bit_a >= bitmap_len)
2591 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2595 err = proc_put_char(&buffer, &left, ',');
2599 err = proc_put_long(&buffer, &left, bit_a, false);
2602 if (bit_a != bit_b) {
2603 err = proc_put_char(&buffer, &left, '-');
2606 err = proc_put_long(&buffer, &left, bit_b, false);
2614 err = proc_put_char(&buffer, &left, '\n');
2620 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2622 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2634 #else /* CONFIG_PROC_SYSCTL */
2636 int proc_dostring(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2642 int proc_dointvec(struct ctl_table *table, int write,
2643 void __user *buffer, size_t *lenp, loff_t *ppos)
2648 int proc_dointvec_minmax(struct ctl_table *table, int write,
2649 void __user *buffer, size_t *lenp, loff_t *ppos)
2654 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2655 void __user *buffer, size_t *lenp, loff_t *ppos)
2660 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2661 void __user *buffer, size_t *lenp, loff_t *ppos)
2666 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2667 void __user *buffer, size_t *lenp, loff_t *ppos)
2672 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2673 void __user *buffer, size_t *lenp, loff_t *ppos)
2678 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2679 void __user *buffer,
2680 size_t *lenp, loff_t *ppos)
2686 #endif /* CONFIG_PROC_SYSCTL */
2689 * No sense putting this after each symbol definition, twice,
2690 * exception granted :-)
2692 EXPORT_SYMBOL(proc_dointvec);
2693 EXPORT_SYMBOL(proc_dointvec_jiffies);
2694 EXPORT_SYMBOL(proc_dointvec_minmax);
2695 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2696 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2697 EXPORT_SYMBOL(proc_dostring);
2698 EXPORT_SYMBOL(proc_doulongvec_minmax);
2699 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);