2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
71 #include <asm/stacktrace.h>
75 #include <asm/setup.h>
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
86 #ifdef CONFIG_CHR_DEV_SG
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
95 #if defined(CONFIG_SYSCTL)
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
100 extern int max_threads;
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
108 extern int min_free_kbytes;
109 extern int pid_max_min, pid_max_max;
110 extern int sysctl_drop_caches;
111 extern int percpu_pagelist_fraction;
112 extern int compat_log;
113 extern int latencytop_enabled;
114 extern int sysctl_nr_open_min, sysctl_nr_open_max;
116 extern int sysctl_nr_trim_pages;
119 extern int blk_iopoll_enabled;
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 static int neg_one = -1;
129 static int __maybe_unused one = 1;
130 static int __maybe_unused two = 2;
131 static int __maybe_unused three = 3;
132 static unsigned long one_ul = 1;
133 static int one_hundred = 100;
135 static int ten_thousand = 10000;
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144 static int min_percpu_pagelist_fract = 8;
146 static int ngroups_max = NGROUPS_MAX;
147 static const int cap_last_cap = CAP_LAST_CAP;
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
155 #ifdef CONFIG_SPARC64
156 extern int sysctl_tsb_ratio;
160 extern int pwrsw_enabled;
161 extern int unaligned_enabled;
165 extern int unaligned_dump_stack;
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
169 extern int no_unaligned_warning;
172 #ifdef CONFIG_PROC_SYSCTL
173 static int proc_do_cad_pid(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175 static int proc_taint(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
184 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #ifdef CONFIG_COREDUMP
187 static int proc_dostring_coredump(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #ifdef CONFIG_MAGIC_SYSRQ
192 /* Note: sysrq code uses it's own private copy */
193 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
195 static int sysrq_sysctl_handler(ctl_table *table, int write,
196 void __user *buffer, size_t *lenp,
201 error = proc_dointvec(table, write, buffer, lenp, ppos);
206 sysrq_toggle_support(__sysrq_enabled);
213 static struct ctl_table kern_table[];
214 static struct ctl_table vm_table[];
215 static struct ctl_table fs_table[];
216 static struct ctl_table debug_table[];
217 static struct ctl_table dev_table[];
218 extern struct ctl_table random_table[];
220 extern struct ctl_table epoll_table[];
223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
224 int sysctl_legacy_va_layout;
227 /* The default sysctl tables: */
229 static struct ctl_table sysctl_base_table[] = {
231 .procname = "kernel",
248 .child = debug_table,
258 #ifdef CONFIG_SCHED_DEBUG
259 static int min_sched_granularity_ns = 100000; /* 100 usecs */
260 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 static int min_wakeup_granularity_ns; /* 0 usecs */
262 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
265 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
266 #endif /* CONFIG_SMP */
267 #endif /* CONFIG_SCHED_DEBUG */
269 #ifdef CONFIG_COMPACTION
270 static int min_extfrag_threshold;
271 static int max_extfrag_threshold = 1000;
274 static struct ctl_table kern_table[] = {
276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
280 .proc_handler = proc_dointvec,
282 #ifdef CONFIG_SCHED_DEBUG
284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
286 .maxlen = sizeof(unsigned int),
288 .proc_handler = sched_proc_update_handler,
289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
295 .maxlen = sizeof(unsigned int),
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
302 .procname = "sched_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
312 .procname = "sched_tunable_scaling",
313 .data = &sysctl_sched_tunable_scaling,
314 .maxlen = sizeof(enum sched_tunable_scaling),
316 .proc_handler = sched_proc_update_handler,
317 .extra1 = &min_sched_tunable_scaling,
318 .extra2 = &max_sched_tunable_scaling,
321 .procname = "sched_migration_cost_ns",
322 .data = &sysctl_sched_migration_cost,
323 .maxlen = sizeof(unsigned int),
325 .proc_handler = proc_dointvec,
328 .procname = "sched_nr_migrate",
329 .data = &sysctl_sched_nr_migrate,
330 .maxlen = sizeof(unsigned int),
332 .proc_handler = proc_dointvec,
335 .procname = "sched_time_avg_ms",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
339 .proc_handler = proc_dointvec,
342 .procname = "sched_shares_window_ns",
343 .data = &sysctl_sched_shares_window,
344 .maxlen = sizeof(unsigned int),
346 .proc_handler = proc_dointvec,
349 .procname = "timer_migration",
350 .data = &sysctl_timer_migration,
351 .maxlen = sizeof(unsigned int),
353 .proc_handler = proc_dointvec_minmax,
357 #endif /* CONFIG_SMP */
358 #ifdef CONFIG_NUMA_BALANCING
360 .procname = "numa_balancing_scan_delay_ms",
361 .data = &sysctl_numa_balancing_scan_delay,
362 .maxlen = sizeof(unsigned int),
364 .proc_handler = proc_dointvec,
367 .procname = "numa_balancing_scan_period_min_ms",
368 .data = &sysctl_numa_balancing_scan_period_min,
369 .maxlen = sizeof(unsigned int),
371 .proc_handler = proc_dointvec,
374 .procname = "numa_balancing_scan_period_reset",
375 .data = &sysctl_numa_balancing_scan_period_reset,
376 .maxlen = sizeof(unsigned int),
378 .proc_handler = proc_dointvec,
381 .procname = "numa_balancing_scan_period_max_ms",
382 .data = &sysctl_numa_balancing_scan_period_max,
383 .maxlen = sizeof(unsigned int),
385 .proc_handler = proc_dointvec,
388 .procname = "numa_balancing_scan_size_mb",
389 .data = &sysctl_numa_balancing_scan_size,
390 .maxlen = sizeof(unsigned int),
392 .proc_handler = proc_dointvec,
394 #endif /* CONFIG_NUMA_BALANCING */
395 #endif /* CONFIG_SCHED_DEBUG */
397 .procname = "sched_rt_period_us",
398 .data = &sysctl_sched_rt_period,
399 .maxlen = sizeof(unsigned int),
401 .proc_handler = sched_rt_handler,
404 .procname = "sched_rt_runtime_us",
405 .data = &sysctl_sched_rt_runtime,
406 .maxlen = sizeof(int),
408 .proc_handler = sched_rt_handler,
411 .procname = "sched_rr_timeslice_ms",
412 .data = &sched_rr_timeslice,
413 .maxlen = sizeof(int),
415 .proc_handler = sched_rr_handler,
417 #ifdef CONFIG_SCHED_AUTOGROUP
419 .procname = "sched_autogroup_enabled",
420 .data = &sysctl_sched_autogroup_enabled,
421 .maxlen = sizeof(unsigned int),
423 .proc_handler = proc_dointvec_minmax,
428 #ifdef CONFIG_CFS_BANDWIDTH
430 .procname = "sched_cfs_bandwidth_slice_us",
431 .data = &sysctl_sched_cfs_bandwidth_slice,
432 .maxlen = sizeof(unsigned int),
434 .proc_handler = proc_dointvec_minmax,
438 #ifdef CONFIG_PROVE_LOCKING
440 .procname = "prove_locking",
441 .data = &prove_locking,
442 .maxlen = sizeof(int),
444 .proc_handler = proc_dointvec,
447 #ifdef CONFIG_LOCK_STAT
449 .procname = "lock_stat",
451 .maxlen = sizeof(int),
453 .proc_handler = proc_dointvec,
458 .data = &panic_timeout,
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec,
463 #ifdef CONFIG_COREDUMP
465 .procname = "core_uses_pid",
466 .data = &core_uses_pid,
467 .maxlen = sizeof(int),
469 .proc_handler = proc_dointvec,
472 .procname = "core_pattern",
473 .data = core_pattern,
474 .maxlen = CORENAME_MAX_SIZE,
476 .proc_handler = proc_dostring_coredump,
479 .procname = "core_pipe_limit",
480 .data = &core_pipe_limit,
481 .maxlen = sizeof(unsigned int),
483 .proc_handler = proc_dointvec,
486 #ifdef CONFIG_PROC_SYSCTL
488 .procname = "tainted",
489 .maxlen = sizeof(long),
491 .proc_handler = proc_taint,
494 #ifdef CONFIG_LATENCYTOP
496 .procname = "latencytop",
497 .data = &latencytop_enabled,
498 .maxlen = sizeof(int),
500 .proc_handler = proc_dointvec,
503 #ifdef CONFIG_BLK_DEV_INITRD
505 .procname = "real-root-dev",
506 .data = &real_root_dev,
507 .maxlen = sizeof(int),
509 .proc_handler = proc_dointvec,
513 .procname = "print-fatal-signals",
514 .data = &print_fatal_signals,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec,
521 .procname = "reboot-cmd",
522 .data = reboot_command,
525 .proc_handler = proc_dostring,
528 .procname = "stop-a",
529 .data = &stop_a_enabled,
530 .maxlen = sizeof (int),
532 .proc_handler = proc_dointvec,
535 .procname = "scons-poweroff",
536 .data = &scons_pwroff,
537 .maxlen = sizeof (int),
539 .proc_handler = proc_dointvec,
542 #ifdef CONFIG_SPARC64
544 .procname = "tsb-ratio",
545 .data = &sysctl_tsb_ratio,
546 .maxlen = sizeof (int),
548 .proc_handler = proc_dointvec,
553 .procname = "soft-power",
554 .data = &pwrsw_enabled,
555 .maxlen = sizeof (int),
557 .proc_handler = proc_dointvec,
560 .procname = "unaligned-trap",
561 .data = &unaligned_enabled,
562 .maxlen = sizeof (int),
564 .proc_handler = proc_dointvec,
568 .procname = "ctrl-alt-del",
570 .maxlen = sizeof(int),
572 .proc_handler = proc_dointvec,
574 #ifdef CONFIG_FUNCTION_TRACER
576 .procname = "ftrace_enabled",
577 .data = &ftrace_enabled,
578 .maxlen = sizeof(int),
580 .proc_handler = ftrace_enable_sysctl,
583 #ifdef CONFIG_STACK_TRACER
585 .procname = "stack_tracer_enabled",
586 .data = &stack_tracer_enabled,
587 .maxlen = sizeof(int),
589 .proc_handler = stack_trace_sysctl,
592 #ifdef CONFIG_TRACING
594 .procname = "ftrace_dump_on_oops",
595 .data = &ftrace_dump_on_oops,
596 .maxlen = sizeof(int),
598 .proc_handler = proc_dointvec,
601 #ifdef CONFIG_MODULES
603 .procname = "modprobe",
604 .data = &modprobe_path,
605 .maxlen = KMOD_PATH_LEN,
607 .proc_handler = proc_dostring,
610 .procname = "modules_disabled",
611 .data = &modules_disabled,
612 .maxlen = sizeof(int),
614 /* only handle a transition from default "0" to "1" */
615 .proc_handler = proc_dointvec_minmax,
622 .procname = "hotplug",
623 .data = &uevent_helper,
624 .maxlen = UEVENT_HELPER_PATH_LEN,
626 .proc_handler = proc_dostring,
629 #ifdef CONFIG_CHR_DEV_SG
631 .procname = "sg-big-buff",
632 .data = &sg_big_buff,
633 .maxlen = sizeof (int),
635 .proc_handler = proc_dointvec,
638 #ifdef CONFIG_BSD_PROCESS_ACCT
642 .maxlen = 3*sizeof(int),
644 .proc_handler = proc_dointvec,
647 #ifdef CONFIG_MAGIC_SYSRQ
650 .data = &__sysrq_enabled,
651 .maxlen = sizeof (int),
653 .proc_handler = sysrq_sysctl_handler,
656 #ifdef CONFIG_PROC_SYSCTL
658 .procname = "cad_pid",
660 .maxlen = sizeof (int),
662 .proc_handler = proc_do_cad_pid,
666 .procname = "threads-max",
667 .data = &max_threads,
668 .maxlen = sizeof(int),
670 .proc_handler = proc_dointvec,
673 .procname = "random",
675 .child = random_table,
678 .procname = "usermodehelper",
680 .child = usermodehelper_table,
683 .procname = "overflowuid",
684 .data = &overflowuid,
685 .maxlen = sizeof(int),
687 .proc_handler = proc_dointvec_minmax,
688 .extra1 = &minolduid,
689 .extra2 = &maxolduid,
692 .procname = "overflowgid",
693 .data = &overflowgid,
694 .maxlen = sizeof(int),
696 .proc_handler = proc_dointvec_minmax,
697 .extra1 = &minolduid,
698 .extra2 = &maxolduid,
701 #ifdef CONFIG_MATHEMU
703 .procname = "ieee_emulation_warnings",
704 .data = &sysctl_ieee_emulation_warnings,
705 .maxlen = sizeof(int),
707 .proc_handler = proc_dointvec,
711 .procname = "userprocess_debug",
712 .data = &show_unhandled_signals,
713 .maxlen = sizeof(int),
715 .proc_handler = proc_dointvec,
719 .procname = "pid_max",
721 .maxlen = sizeof (int),
723 .proc_handler = proc_dointvec_minmax,
724 .extra1 = &pid_max_min,
725 .extra2 = &pid_max_max,
728 .procname = "panic_on_oops",
729 .data = &panic_on_oops,
730 .maxlen = sizeof(int),
732 .proc_handler = proc_dointvec,
734 #if defined CONFIG_PRINTK
736 .procname = "printk",
737 .data = &console_loglevel,
738 .maxlen = 4*sizeof(int),
740 .proc_handler = proc_dointvec,
743 .procname = "printk_ratelimit",
744 .data = &printk_ratelimit_state.interval,
745 .maxlen = sizeof(int),
747 .proc_handler = proc_dointvec_jiffies,
750 .procname = "printk_ratelimit_burst",
751 .data = &printk_ratelimit_state.burst,
752 .maxlen = sizeof(int),
754 .proc_handler = proc_dointvec,
757 .procname = "printk_delay",
758 .data = &printk_delay_msec,
759 .maxlen = sizeof(int),
761 .proc_handler = proc_dointvec_minmax,
763 .extra2 = &ten_thousand,
766 .procname = "dmesg_restrict",
767 .data = &dmesg_restrict,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec_minmax_sysadmin,
775 .procname = "kptr_restrict",
776 .data = &kptr_restrict,
777 .maxlen = sizeof(int),
779 .proc_handler = proc_dointvec_minmax_sysadmin,
785 .procname = "ngroups_max",
786 .data = &ngroups_max,
787 .maxlen = sizeof (int),
789 .proc_handler = proc_dointvec,
792 .procname = "cap_last_cap",
793 .data = (void *)&cap_last_cap,
794 .maxlen = sizeof(int),
796 .proc_handler = proc_dointvec,
798 #if defined(CONFIG_LOCKUP_DETECTOR)
800 .procname = "watchdog",
801 .data = &watchdog_enabled,
802 .maxlen = sizeof (int),
804 .proc_handler = proc_dowatchdog,
809 .procname = "watchdog_thresh",
810 .data = &watchdog_thresh,
811 .maxlen = sizeof(int),
813 .proc_handler = proc_dowatchdog,
818 .procname = "softlockup_panic",
819 .data = &softlockup_panic,
820 .maxlen = sizeof(int),
822 .proc_handler = proc_dointvec_minmax,
827 .procname = "nmi_watchdog",
828 .data = &watchdog_enabled,
829 .maxlen = sizeof (int),
831 .proc_handler = proc_dowatchdog,
836 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
838 .procname = "unknown_nmi_panic",
839 .data = &unknown_nmi_panic,
840 .maxlen = sizeof (int),
842 .proc_handler = proc_dointvec,
845 #if defined(CONFIG_X86)
847 .procname = "panic_on_unrecovered_nmi",
848 .data = &panic_on_unrecovered_nmi,
849 .maxlen = sizeof(int),
851 .proc_handler = proc_dointvec,
854 .procname = "panic_on_io_nmi",
855 .data = &panic_on_io_nmi,
856 .maxlen = sizeof(int),
858 .proc_handler = proc_dointvec,
860 #ifdef CONFIG_DEBUG_STACKOVERFLOW
862 .procname = "panic_on_stackoverflow",
863 .data = &sysctl_panic_on_stackoverflow,
864 .maxlen = sizeof(int),
866 .proc_handler = proc_dointvec,
870 .procname = "bootloader_type",
871 .data = &bootloader_type,
872 .maxlen = sizeof (int),
874 .proc_handler = proc_dointvec,
877 .procname = "bootloader_version",
878 .data = &bootloader_version,
879 .maxlen = sizeof (int),
881 .proc_handler = proc_dointvec,
884 .procname = "kstack_depth_to_print",
885 .data = &kstack_depth_to_print,
886 .maxlen = sizeof(int),
888 .proc_handler = proc_dointvec,
891 .procname = "io_delay_type",
892 .data = &io_delay_type,
893 .maxlen = sizeof(int),
895 .proc_handler = proc_dointvec,
898 #if defined(CONFIG_MMU)
900 .procname = "randomize_va_space",
901 .data = &randomize_va_space,
902 .maxlen = sizeof(int),
904 .proc_handler = proc_dointvec,
907 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
909 .procname = "spin_retry",
911 .maxlen = sizeof (int),
913 .proc_handler = proc_dointvec,
916 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
918 .procname = "acpi_video_flags",
919 .data = &acpi_realmode_flags,
920 .maxlen = sizeof (unsigned long),
922 .proc_handler = proc_doulongvec_minmax,
925 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
927 .procname = "ignore-unaligned-usertrap",
928 .data = &no_unaligned_warning,
929 .maxlen = sizeof (int),
931 .proc_handler = proc_dointvec,
936 .procname = "unaligned-dump-stack",
937 .data = &unaligned_dump_stack,
938 .maxlen = sizeof (int),
940 .proc_handler = proc_dointvec,
943 #ifdef CONFIG_DETECT_HUNG_TASK
945 .procname = "hung_task_panic",
946 .data = &sysctl_hung_task_panic,
947 .maxlen = sizeof(int),
949 .proc_handler = proc_dointvec_minmax,
954 .procname = "hung_task_check_count",
955 .data = &sysctl_hung_task_check_count,
956 .maxlen = sizeof(unsigned long),
958 .proc_handler = proc_doulongvec_minmax,
961 .procname = "hung_task_timeout_secs",
962 .data = &sysctl_hung_task_timeout_secs,
963 .maxlen = sizeof(unsigned long),
965 .proc_handler = proc_dohung_task_timeout_secs,
968 .procname = "hung_task_warnings",
969 .data = &sysctl_hung_task_warnings,
970 .maxlen = sizeof(unsigned long),
972 .proc_handler = proc_doulongvec_minmax,
977 .procname = "compat-log",
979 .maxlen = sizeof (int),
981 .proc_handler = proc_dointvec,
984 #ifdef CONFIG_RT_MUTEXES
986 .procname = "max_lock_depth",
987 .data = &max_lock_depth,
988 .maxlen = sizeof(int),
990 .proc_handler = proc_dointvec,
994 .procname = "poweroff_cmd",
995 .data = &poweroff_cmd,
996 .maxlen = POWEROFF_CMD_PATH_LEN,
998 .proc_handler = proc_dostring,
1004 .child = key_sysctls,
1007 #ifdef CONFIG_RCU_TORTURE_TEST
1009 .procname = "rcutorture_runnable",
1010 .data = &rcutorture_runnable,
1011 .maxlen = sizeof(int),
1013 .proc_handler = proc_dointvec,
1016 #ifdef CONFIG_PERF_EVENTS
1018 * User-space scripts rely on the existence of this file
1019 * as a feature check for perf_events being enabled.
1021 * So it's an ABI, do not remove!
1024 .procname = "perf_event_paranoid",
1025 .data = &sysctl_perf_event_paranoid,
1026 .maxlen = sizeof(sysctl_perf_event_paranoid),
1028 .proc_handler = proc_dointvec,
1031 .procname = "perf_event_mlock_kb",
1032 .data = &sysctl_perf_event_mlock,
1033 .maxlen = sizeof(sysctl_perf_event_mlock),
1035 .proc_handler = proc_dointvec,
1038 .procname = "perf_event_max_sample_rate",
1039 .data = &sysctl_perf_event_sample_rate,
1040 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1042 .proc_handler = perf_proc_update_handler,
1045 #ifdef CONFIG_KMEMCHECK
1047 .procname = "kmemcheck",
1048 .data = &kmemcheck_enabled,
1049 .maxlen = sizeof(int),
1051 .proc_handler = proc_dointvec,
1056 .procname = "blk_iopoll",
1057 .data = &blk_iopoll_enabled,
1058 .maxlen = sizeof(int),
1060 .proc_handler = proc_dointvec,
1066 static struct ctl_table vm_table[] = {
1068 .procname = "overcommit_memory",
1069 .data = &sysctl_overcommit_memory,
1070 .maxlen = sizeof(sysctl_overcommit_memory),
1072 .proc_handler = proc_dointvec_minmax,
1077 .procname = "panic_on_oom",
1078 .data = &sysctl_panic_on_oom,
1079 .maxlen = sizeof(sysctl_panic_on_oom),
1081 .proc_handler = proc_dointvec_minmax,
1086 .procname = "oom_kill_allocating_task",
1087 .data = &sysctl_oom_kill_allocating_task,
1088 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1090 .proc_handler = proc_dointvec,
1093 .procname = "oom_dump_tasks",
1094 .data = &sysctl_oom_dump_tasks,
1095 .maxlen = sizeof(sysctl_oom_dump_tasks),
1097 .proc_handler = proc_dointvec,
1100 .procname = "overcommit_ratio",
1101 .data = &sysctl_overcommit_ratio,
1102 .maxlen = sizeof(sysctl_overcommit_ratio),
1104 .proc_handler = proc_dointvec,
1107 .procname = "page-cluster",
1108 .data = &page_cluster,
1109 .maxlen = sizeof(int),
1111 .proc_handler = proc_dointvec_minmax,
1115 .procname = "dirty_background_ratio",
1116 .data = &dirty_background_ratio,
1117 .maxlen = sizeof(dirty_background_ratio),
1119 .proc_handler = dirty_background_ratio_handler,
1121 .extra2 = &one_hundred,
1124 .procname = "dirty_background_bytes",
1125 .data = &dirty_background_bytes,
1126 .maxlen = sizeof(dirty_background_bytes),
1128 .proc_handler = dirty_background_bytes_handler,
1132 .procname = "dirty_ratio",
1133 .data = &vm_dirty_ratio,
1134 .maxlen = sizeof(vm_dirty_ratio),
1136 .proc_handler = dirty_ratio_handler,
1138 .extra2 = &one_hundred,
1141 .procname = "dirty_bytes",
1142 .data = &vm_dirty_bytes,
1143 .maxlen = sizeof(vm_dirty_bytes),
1145 .proc_handler = dirty_bytes_handler,
1146 .extra1 = &dirty_bytes_min,
1149 .procname = "dirty_writeback_centisecs",
1150 .data = &dirty_writeback_interval,
1151 .maxlen = sizeof(dirty_writeback_interval),
1153 .proc_handler = dirty_writeback_centisecs_handler,
1156 .procname = "dirty_expire_centisecs",
1157 .data = &dirty_expire_interval,
1158 .maxlen = sizeof(dirty_expire_interval),
1160 .proc_handler = proc_dointvec_minmax,
1164 .procname = "nr_pdflush_threads",
1165 .mode = 0444 /* read-only */,
1166 .proc_handler = pdflush_proc_obsolete,
1169 .procname = "swappiness",
1170 .data = &vm_swappiness,
1171 .maxlen = sizeof(vm_swappiness),
1173 .proc_handler = proc_dointvec_minmax,
1175 .extra2 = &one_hundred,
1177 #ifdef CONFIG_HUGETLB_PAGE
1179 .procname = "nr_hugepages",
1181 .maxlen = sizeof(unsigned long),
1183 .proc_handler = hugetlb_sysctl_handler,
1184 .extra1 = (void *)&hugetlb_zero,
1185 .extra2 = (void *)&hugetlb_infinity,
1189 .procname = "nr_hugepages_mempolicy",
1191 .maxlen = sizeof(unsigned long),
1193 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1194 .extra1 = (void *)&hugetlb_zero,
1195 .extra2 = (void *)&hugetlb_infinity,
1199 .procname = "hugetlb_shm_group",
1200 .data = &sysctl_hugetlb_shm_group,
1201 .maxlen = sizeof(gid_t),
1203 .proc_handler = proc_dointvec,
1206 .procname = "hugepages_treat_as_movable",
1207 .data = &hugepages_treat_as_movable,
1208 .maxlen = sizeof(int),
1210 .proc_handler = hugetlb_treat_movable_handler,
1213 .procname = "nr_overcommit_hugepages",
1215 .maxlen = sizeof(unsigned long),
1217 .proc_handler = hugetlb_overcommit_handler,
1218 .extra1 = (void *)&hugetlb_zero,
1219 .extra2 = (void *)&hugetlb_infinity,
1223 .procname = "lowmem_reserve_ratio",
1224 .data = &sysctl_lowmem_reserve_ratio,
1225 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1227 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1230 .procname = "drop_caches",
1231 .data = &sysctl_drop_caches,
1232 .maxlen = sizeof(int),
1234 .proc_handler = drop_caches_sysctl_handler,
1238 #ifdef CONFIG_COMPACTION
1240 .procname = "compact_memory",
1241 .data = &sysctl_compact_memory,
1242 .maxlen = sizeof(int),
1244 .proc_handler = sysctl_compaction_handler,
1247 .procname = "extfrag_threshold",
1248 .data = &sysctl_extfrag_threshold,
1249 .maxlen = sizeof(int),
1251 .proc_handler = sysctl_extfrag_handler,
1252 .extra1 = &min_extfrag_threshold,
1253 .extra2 = &max_extfrag_threshold,
1256 #endif /* CONFIG_COMPACTION */
1258 .procname = "min_free_kbytes",
1259 .data = &min_free_kbytes,
1260 .maxlen = sizeof(min_free_kbytes),
1262 .proc_handler = min_free_kbytes_sysctl_handler,
1266 .procname = "percpu_pagelist_fraction",
1267 .data = &percpu_pagelist_fraction,
1268 .maxlen = sizeof(percpu_pagelist_fraction),
1270 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1271 .extra1 = &min_percpu_pagelist_fract,
1275 .procname = "max_map_count",
1276 .data = &sysctl_max_map_count,
1277 .maxlen = sizeof(sysctl_max_map_count),
1279 .proc_handler = proc_dointvec_minmax,
1284 .procname = "nr_trim_pages",
1285 .data = &sysctl_nr_trim_pages,
1286 .maxlen = sizeof(sysctl_nr_trim_pages),
1288 .proc_handler = proc_dointvec_minmax,
1293 .procname = "laptop_mode",
1294 .data = &laptop_mode,
1295 .maxlen = sizeof(laptop_mode),
1297 .proc_handler = proc_dointvec_jiffies,
1300 .procname = "block_dump",
1301 .data = &block_dump,
1302 .maxlen = sizeof(block_dump),
1304 .proc_handler = proc_dointvec,
1308 .procname = "vfs_cache_pressure",
1309 .data = &sysctl_vfs_cache_pressure,
1310 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1312 .proc_handler = proc_dointvec,
1315 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1317 .procname = "legacy_va_layout",
1318 .data = &sysctl_legacy_va_layout,
1319 .maxlen = sizeof(sysctl_legacy_va_layout),
1321 .proc_handler = proc_dointvec,
1327 .procname = "zone_reclaim_mode",
1328 .data = &zone_reclaim_mode,
1329 .maxlen = sizeof(zone_reclaim_mode),
1331 .proc_handler = proc_dointvec,
1335 .procname = "min_unmapped_ratio",
1336 .data = &sysctl_min_unmapped_ratio,
1337 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1339 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1341 .extra2 = &one_hundred,
1344 .procname = "min_slab_ratio",
1345 .data = &sysctl_min_slab_ratio,
1346 .maxlen = sizeof(sysctl_min_slab_ratio),
1348 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1350 .extra2 = &one_hundred,
1355 .procname = "stat_interval",
1356 .data = &sysctl_stat_interval,
1357 .maxlen = sizeof(sysctl_stat_interval),
1359 .proc_handler = proc_dointvec_jiffies,
1364 .procname = "mmap_min_addr",
1365 .data = &dac_mmap_min_addr,
1366 .maxlen = sizeof(unsigned long),
1368 .proc_handler = mmap_min_addr_handler,
1373 .procname = "numa_zonelist_order",
1374 .data = &numa_zonelist_order,
1375 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1377 .proc_handler = numa_zonelist_order_handler,
1380 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1381 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1383 .procname = "vdso_enabled",
1384 .data = &vdso_enabled,
1385 .maxlen = sizeof(vdso_enabled),
1387 .proc_handler = proc_dointvec,
1391 #ifdef CONFIG_HIGHMEM
1393 .procname = "highmem_is_dirtyable",
1394 .data = &vm_highmem_is_dirtyable,
1395 .maxlen = sizeof(vm_highmem_is_dirtyable),
1397 .proc_handler = proc_dointvec_minmax,
1403 .procname = "scan_unevictable_pages",
1404 .data = &scan_unevictable_pages,
1405 .maxlen = sizeof(scan_unevictable_pages),
1407 .proc_handler = scan_unevictable_handler,
1409 #ifdef CONFIG_MEMORY_FAILURE
1411 .procname = "memory_failure_early_kill",
1412 .data = &sysctl_memory_failure_early_kill,
1413 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1415 .proc_handler = proc_dointvec_minmax,
1420 .procname = "memory_failure_recovery",
1421 .data = &sysctl_memory_failure_recovery,
1422 .maxlen = sizeof(sysctl_memory_failure_recovery),
1424 .proc_handler = proc_dointvec_minmax,
1432 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1433 static struct ctl_table binfmt_misc_table[] = {
1438 static struct ctl_table fs_table[] = {
1440 .procname = "inode-nr",
1441 .data = &inodes_stat,
1442 .maxlen = 2*sizeof(int),
1444 .proc_handler = proc_nr_inodes,
1447 .procname = "inode-state",
1448 .data = &inodes_stat,
1449 .maxlen = 7*sizeof(int),
1451 .proc_handler = proc_nr_inodes,
1454 .procname = "file-nr",
1455 .data = &files_stat,
1456 .maxlen = sizeof(files_stat),
1458 .proc_handler = proc_nr_files,
1461 .procname = "file-max",
1462 .data = &files_stat.max_files,
1463 .maxlen = sizeof(files_stat.max_files),
1465 .proc_handler = proc_doulongvec_minmax,
1468 .procname = "nr_open",
1469 .data = &sysctl_nr_open,
1470 .maxlen = sizeof(int),
1472 .proc_handler = proc_dointvec_minmax,
1473 .extra1 = &sysctl_nr_open_min,
1474 .extra2 = &sysctl_nr_open_max,
1477 .procname = "dentry-state",
1478 .data = &dentry_stat,
1479 .maxlen = 6*sizeof(int),
1481 .proc_handler = proc_nr_dentry,
1484 .procname = "overflowuid",
1485 .data = &fs_overflowuid,
1486 .maxlen = sizeof(int),
1488 .proc_handler = proc_dointvec_minmax,
1489 .extra1 = &minolduid,
1490 .extra2 = &maxolduid,
1493 .procname = "overflowgid",
1494 .data = &fs_overflowgid,
1495 .maxlen = sizeof(int),
1497 .proc_handler = proc_dointvec_minmax,
1498 .extra1 = &minolduid,
1499 .extra2 = &maxolduid,
1501 #ifdef CONFIG_FILE_LOCKING
1503 .procname = "leases-enable",
1504 .data = &leases_enable,
1505 .maxlen = sizeof(int),
1507 .proc_handler = proc_dointvec,
1510 #ifdef CONFIG_DNOTIFY
1512 .procname = "dir-notify-enable",
1513 .data = &dir_notify_enable,
1514 .maxlen = sizeof(int),
1516 .proc_handler = proc_dointvec,
1520 #ifdef CONFIG_FILE_LOCKING
1522 .procname = "lease-break-time",
1523 .data = &lease_break_time,
1524 .maxlen = sizeof(int),
1526 .proc_handler = proc_dointvec,
1531 .procname = "aio-nr",
1533 .maxlen = sizeof(aio_nr),
1535 .proc_handler = proc_doulongvec_minmax,
1538 .procname = "aio-max-nr",
1539 .data = &aio_max_nr,
1540 .maxlen = sizeof(aio_max_nr),
1542 .proc_handler = proc_doulongvec_minmax,
1544 #endif /* CONFIG_AIO */
1545 #ifdef CONFIG_INOTIFY_USER
1547 .procname = "inotify",
1549 .child = inotify_table,
1554 .procname = "epoll",
1556 .child = epoll_table,
1561 .procname = "protected_symlinks",
1562 .data = &sysctl_protected_symlinks,
1563 .maxlen = sizeof(int),
1565 .proc_handler = proc_dointvec_minmax,
1570 .procname = "protected_hardlinks",
1571 .data = &sysctl_protected_hardlinks,
1572 .maxlen = sizeof(int),
1574 .proc_handler = proc_dointvec_minmax,
1579 .procname = "suid_dumpable",
1580 .data = &suid_dumpable,
1581 .maxlen = sizeof(int),
1583 .proc_handler = proc_dointvec_minmax_coredump,
1587 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1589 .procname = "binfmt_misc",
1591 .child = binfmt_misc_table,
1595 .procname = "pipe-max-size",
1596 .data = &pipe_max_size,
1597 .maxlen = sizeof(int),
1599 .proc_handler = &pipe_proc_fn,
1600 .extra1 = &pipe_min_size,
1605 static struct ctl_table debug_table[] = {
1606 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1608 .procname = "exception-trace",
1609 .data = &show_unhandled_signals,
1610 .maxlen = sizeof(int),
1612 .proc_handler = proc_dointvec
1615 #if defined(CONFIG_OPTPROBES)
1617 .procname = "kprobes-optimization",
1618 .data = &sysctl_kprobes_optimization,
1619 .maxlen = sizeof(int),
1621 .proc_handler = proc_kprobes_optimization_handler,
1629 static struct ctl_table dev_table[] = {
1633 int __init sysctl_init(void)
1635 struct ctl_table_header *hdr;
1637 hdr = register_sysctl_table(sysctl_base_table);
1638 kmemleak_not_leak(hdr);
1642 #endif /* CONFIG_SYSCTL */
1648 #ifdef CONFIG_PROC_SYSCTL
1650 static int _proc_do_string(void* data, int maxlen, int write,
1651 void __user *buffer,
1652 size_t *lenp, loff_t *ppos)
1658 if (!data || !maxlen || !*lenp) {
1666 while (len < *lenp) {
1667 if (get_user(c, p++))
1669 if (c == 0 || c == '\n')
1675 if(copy_from_user(data, buffer, len))
1677 ((char *) data)[len] = 0;
1695 if(copy_to_user(buffer, data, len))
1698 if(put_user('\n', ((char __user *) buffer) + len))
1709 * proc_dostring - read a string sysctl
1710 * @table: the sysctl table
1711 * @write: %TRUE if this is a write to the sysctl file
1712 * @buffer: the user buffer
1713 * @lenp: the size of the user buffer
1714 * @ppos: file position
1716 * Reads/writes a string from/to the user buffer. If the kernel
1717 * buffer provided is not large enough to hold the string, the
1718 * string is truncated. The copied string is %NULL-terminated.
1719 * If the string is being read by the user process, it is copied
1720 * and a newline '\n' is added. It is truncated if the buffer is
1723 * Returns 0 on success.
1725 int proc_dostring(struct ctl_table *table, int write,
1726 void __user *buffer, size_t *lenp, loff_t *ppos)
1728 return _proc_do_string(table->data, table->maxlen, write,
1729 buffer, lenp, ppos);
1732 static size_t proc_skip_spaces(char **buf)
1735 char *tmp = skip_spaces(*buf);
1741 static void proc_skip_char(char **buf, size_t *size, const char v)
1751 #define TMPBUFLEN 22
1753 * proc_get_long - reads an ASCII formatted integer from a user buffer
1755 * @buf: a kernel buffer
1756 * @size: size of the kernel buffer
1757 * @val: this is where the number will be stored
1758 * @neg: set to %TRUE if number is negative
1759 * @perm_tr: a vector which contains the allowed trailers
1760 * @perm_tr_len: size of the perm_tr vector
1761 * @tr: pointer to store the trailer character
1763 * In case of success %0 is returned and @buf and @size are updated with
1764 * the amount of bytes read. If @tr is non-NULL and a trailing
1765 * character exists (size is non-zero after returning from this
1766 * function), @tr is updated with the trailing character.
1768 static int proc_get_long(char **buf, size_t *size,
1769 unsigned long *val, bool *neg,
1770 const char *perm_tr, unsigned perm_tr_len, char *tr)
1773 char *p, tmp[TMPBUFLEN];
1779 if (len > TMPBUFLEN - 1)
1780 len = TMPBUFLEN - 1;
1782 memcpy(tmp, *buf, len);
1786 if (*p == '-' && *size > 1) {
1794 *val = simple_strtoul(p, &p, 0);
1798 /* We don't know if the next char is whitespace thus we may accept
1799 * invalid integers (e.g. 1234...a) or two integers instead of one
1800 * (e.g. 123...1). So lets not allow such large numbers. */
1801 if (len == TMPBUFLEN - 1)
1804 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1807 if (tr && (len < *size))
1817 * proc_put_long - converts an integer to a decimal ASCII formatted string
1819 * @buf: the user buffer
1820 * @size: the size of the user buffer
1821 * @val: the integer to be converted
1822 * @neg: sign of the number, %TRUE for negative
1824 * In case of success %0 is returned and @buf and @size are updated with
1825 * the amount of bytes written.
1827 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1831 char tmp[TMPBUFLEN], *p = tmp;
1833 sprintf(p, "%s%lu", neg ? "-" : "", val);
1837 if (copy_to_user(*buf, tmp, len))
1845 static int proc_put_char(void __user **buf, size_t *size, char c)
1848 char __user **buffer = (char __user **)buf;
1849 if (put_user(c, *buffer))
1851 (*size)--, (*buffer)++;
1857 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1859 int write, void *data)
1862 *valp = *negp ? -*lvalp : *lvalp;
1867 *lvalp = (unsigned long)-val;
1870 *lvalp = (unsigned long)val;
1876 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1878 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1879 int write, void __user *buffer,
1880 size_t *lenp, loff_t *ppos,
1881 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1882 int write, void *data),
1885 int *i, vleft, first = 1, err = 0;
1886 unsigned long page = 0;
1890 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1895 i = (int *) tbl_data;
1896 vleft = table->maxlen / sizeof(*i);
1900 conv = do_proc_dointvec_conv;
1903 if (left > PAGE_SIZE - 1)
1904 left = PAGE_SIZE - 1;
1905 page = __get_free_page(GFP_TEMPORARY);
1906 kbuf = (char *) page;
1909 if (copy_from_user(kbuf, buffer, left)) {
1916 for (; left && vleft--; i++, first=0) {
1921 left -= proc_skip_spaces(&kbuf);
1925 err = proc_get_long(&kbuf, &left, &lval, &neg,
1927 sizeof(proc_wspace_sep), NULL);
1930 if (conv(&neg, &lval, i, 1, data)) {
1935 if (conv(&neg, &lval, i, 0, data)) {
1940 err = proc_put_char(&buffer, &left, '\t');
1943 err = proc_put_long(&buffer, &left, lval, neg);
1949 if (!write && !first && left && !err)
1950 err = proc_put_char(&buffer, &left, '\n');
1951 if (write && !err && left)
1952 left -= proc_skip_spaces(&kbuf);
1957 return err ? : -EINVAL;
1964 static int do_proc_dointvec(struct ctl_table *table, int write,
1965 void __user *buffer, size_t *lenp, loff_t *ppos,
1966 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1967 int write, void *data),
1970 return __do_proc_dointvec(table->data, table, write,
1971 buffer, lenp, ppos, conv, data);
1975 * proc_dointvec - read a vector of integers
1976 * @table: the sysctl table
1977 * @write: %TRUE if this is a write to the sysctl file
1978 * @buffer: the user buffer
1979 * @lenp: the size of the user buffer
1980 * @ppos: file position
1982 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1983 * values from/to the user buffer, treated as an ASCII string.
1985 * Returns 0 on success.
1987 int proc_dointvec(struct ctl_table *table, int write,
1988 void __user *buffer, size_t *lenp, loff_t *ppos)
1990 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1995 * Taint values can only be increased
1996 * This means we can safely use a temporary.
1998 static int proc_taint(struct ctl_table *table, int write,
1999 void __user *buffer, size_t *lenp, loff_t *ppos)
2002 unsigned long tmptaint = get_taint();
2005 if (write && !capable(CAP_SYS_ADMIN))
2010 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2016 * Poor man's atomic or. Not worth adding a primitive
2017 * to everyone's atomic.h for this
2020 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2021 if ((tmptaint >> i) & 1)
2029 #ifdef CONFIG_PRINTK
2030 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2031 void __user *buffer, size_t *lenp, loff_t *ppos)
2033 if (write && !capable(CAP_SYS_ADMIN))
2036 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2040 struct do_proc_dointvec_minmax_conv_param {
2045 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2047 int write, void *data)
2049 struct do_proc_dointvec_minmax_conv_param *param = data;
2051 int val = *negp ? -*lvalp : *lvalp;
2052 if ((param->min && *param->min > val) ||
2053 (param->max && *param->max < val))
2060 *lvalp = (unsigned long)-val;
2063 *lvalp = (unsigned long)val;
2070 * proc_dointvec_minmax - read a vector of integers with min/max values
2071 * @table: the sysctl table
2072 * @write: %TRUE if this is a write to the sysctl file
2073 * @buffer: the user buffer
2074 * @lenp: the size of the user buffer
2075 * @ppos: file position
2077 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2078 * values from/to the user buffer, treated as an ASCII string.
2080 * This routine will ensure the values are within the range specified by
2081 * table->extra1 (min) and table->extra2 (max).
2083 * Returns 0 on success.
2085 int proc_dointvec_minmax(struct ctl_table *table, int write,
2086 void __user *buffer, size_t *lenp, loff_t *ppos)
2088 struct do_proc_dointvec_minmax_conv_param param = {
2089 .min = (int *) table->extra1,
2090 .max = (int *) table->extra2,
2092 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2093 do_proc_dointvec_minmax_conv, ¶m);
2096 static void validate_coredump_safety(void)
2098 #ifdef CONFIG_COREDUMP
2099 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2100 core_pattern[0] != '/' && core_pattern[0] != '|') {
2101 printk(KERN_WARNING "Unsafe core_pattern used with "\
2102 "suid_dumpable=2. Pipe handler or fully qualified "\
2103 "core dump path required.\n");
2108 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2109 void __user *buffer, size_t *lenp, loff_t *ppos)
2111 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2113 validate_coredump_safety();
2117 #ifdef CONFIG_COREDUMP
2118 static int proc_dostring_coredump(struct ctl_table *table, int write,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2121 int error = proc_dostring(table, write, buffer, lenp, ppos);
2123 validate_coredump_safety();
2128 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2129 void __user *buffer,
2130 size_t *lenp, loff_t *ppos,
2131 unsigned long convmul,
2132 unsigned long convdiv)
2134 unsigned long *i, *min, *max;
2135 int vleft, first = 1, err = 0;
2136 unsigned long page = 0;
2140 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2145 i = (unsigned long *) data;
2146 min = (unsigned long *) table->extra1;
2147 max = (unsigned long *) table->extra2;
2148 vleft = table->maxlen / sizeof(unsigned long);
2152 if (left > PAGE_SIZE - 1)
2153 left = PAGE_SIZE - 1;
2154 page = __get_free_page(GFP_TEMPORARY);
2155 kbuf = (char *) page;
2158 if (copy_from_user(kbuf, buffer, left)) {
2165 for (; left && vleft--; i++, first = 0) {
2171 left -= proc_skip_spaces(&kbuf);
2173 err = proc_get_long(&kbuf, &left, &val, &neg,
2175 sizeof(proc_wspace_sep), NULL);
2180 if ((min && val < *min) || (max && val > *max))
2184 val = convdiv * (*i) / convmul;
2186 err = proc_put_char(&buffer, &left, '\t');
2187 err = proc_put_long(&buffer, &left, val, false);
2193 if (!write && !first && left && !err)
2194 err = proc_put_char(&buffer, &left, '\n');
2196 left -= proc_skip_spaces(&kbuf);
2201 return err ? : -EINVAL;
2208 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2209 void __user *buffer,
2210 size_t *lenp, loff_t *ppos,
2211 unsigned long convmul,
2212 unsigned long convdiv)
2214 return __do_proc_doulongvec_minmax(table->data, table, write,
2215 buffer, lenp, ppos, convmul, convdiv);
2219 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2220 * @table: the sysctl table
2221 * @write: %TRUE if this is a write to the sysctl file
2222 * @buffer: the user buffer
2223 * @lenp: the size of the user buffer
2224 * @ppos: file position
2226 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2227 * values from/to the user buffer, treated as an ASCII string.
2229 * This routine will ensure the values are within the range specified by
2230 * table->extra1 (min) and table->extra2 (max).
2232 * Returns 0 on success.
2234 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2235 void __user *buffer, size_t *lenp, loff_t *ppos)
2237 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2241 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2242 * @table: the sysctl table
2243 * @write: %TRUE if this is a write to the sysctl file
2244 * @buffer: the user buffer
2245 * @lenp: the size of the user buffer
2246 * @ppos: file position
2248 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2249 * values from/to the user buffer, treated as an ASCII string. The values
2250 * are treated as milliseconds, and converted to jiffies when they are stored.
2252 * This routine will ensure the values are within the range specified by
2253 * table->extra1 (min) and table->extra2 (max).
2255 * Returns 0 on success.
2257 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2258 void __user *buffer,
2259 size_t *lenp, loff_t *ppos)
2261 return do_proc_doulongvec_minmax(table, write, buffer,
2262 lenp, ppos, HZ, 1000l);
2266 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2268 int write, void *data)
2271 if (*lvalp > LONG_MAX / HZ)
2273 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2279 lval = (unsigned long)-val;
2282 lval = (unsigned long)val;
2289 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2291 int write, void *data)
2294 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2296 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2302 lval = (unsigned long)-val;
2305 lval = (unsigned long)val;
2307 *lvalp = jiffies_to_clock_t(lval);
2312 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2314 int write, void *data)
2317 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2323 lval = (unsigned long)-val;
2326 lval = (unsigned long)val;
2328 *lvalp = jiffies_to_msecs(lval);
2334 * proc_dointvec_jiffies - read a vector of integers as seconds
2335 * @table: the sysctl table
2336 * @write: %TRUE if this is a write to the sysctl file
2337 * @buffer: the user buffer
2338 * @lenp: the size of the user buffer
2339 * @ppos: file position
2341 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2342 * values from/to the user buffer, treated as an ASCII string.
2343 * The values read are assumed to be in seconds, and are converted into
2346 * Returns 0 on success.
2348 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2349 void __user *buffer, size_t *lenp, loff_t *ppos)
2351 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2352 do_proc_dointvec_jiffies_conv,NULL);
2356 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2357 * @table: the sysctl table
2358 * @write: %TRUE if this is a write to the sysctl file
2359 * @buffer: the user buffer
2360 * @lenp: the size of the user buffer
2361 * @ppos: pointer to the file position
2363 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2364 * values from/to the user buffer, treated as an ASCII string.
2365 * The values read are assumed to be in 1/USER_HZ seconds, and
2366 * are converted into jiffies.
2368 * Returns 0 on success.
2370 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2371 void __user *buffer, size_t *lenp, loff_t *ppos)
2373 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2374 do_proc_dointvec_userhz_jiffies_conv,NULL);
2378 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2379 * @table: the sysctl table
2380 * @write: %TRUE if this is a write to the sysctl file
2381 * @buffer: the user buffer
2382 * @lenp: the size of the user buffer
2383 * @ppos: file position
2384 * @ppos: the current position in the file
2386 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2387 * values from/to the user buffer, treated as an ASCII string.
2388 * The values read are assumed to be in 1/1000 seconds, and
2389 * are converted into jiffies.
2391 * Returns 0 on success.
2393 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2394 void __user *buffer, size_t *lenp, loff_t *ppos)
2396 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2397 do_proc_dointvec_ms_jiffies_conv, NULL);
2400 static int proc_do_cad_pid(struct ctl_table *table, int write,
2401 void __user *buffer, size_t *lenp, loff_t *ppos)
2403 struct pid *new_pid;
2407 tmp = pid_vnr(cad_pid);
2409 r = __do_proc_dointvec(&tmp, table, write, buffer,
2410 lenp, ppos, NULL, NULL);
2414 new_pid = find_get_pid(tmp);
2418 put_pid(xchg(&cad_pid, new_pid));
2423 * proc_do_large_bitmap - read/write from/to a large bitmap
2424 * @table: the sysctl table
2425 * @write: %TRUE if this is a write to the sysctl file
2426 * @buffer: the user buffer
2427 * @lenp: the size of the user buffer
2428 * @ppos: file position
2430 * The bitmap is stored at table->data and the bitmap length (in bits)
2433 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2434 * large bitmaps may be represented in a compact manner. Writing into
2435 * the file will clear the bitmap then update it with the given input.
2437 * Returns 0 on success.
2439 int proc_do_large_bitmap(struct ctl_table *table, int write,
2440 void __user *buffer, size_t *lenp, loff_t *ppos)
2444 size_t left = *lenp;
2445 unsigned long bitmap_len = table->maxlen;
2446 unsigned long *bitmap = (unsigned long *) table->data;
2447 unsigned long *tmp_bitmap = NULL;
2448 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2450 if (!bitmap_len || !left || (*ppos && !write)) {
2456 unsigned long page = 0;
2459 if (left > PAGE_SIZE - 1)
2460 left = PAGE_SIZE - 1;
2462 page = __get_free_page(GFP_TEMPORARY);
2463 kbuf = (char *) page;
2466 if (copy_from_user(kbuf, buffer, left)) {
2472 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2478 proc_skip_char(&kbuf, &left, '\n');
2479 while (!err && left) {
2480 unsigned long val_a, val_b;
2483 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2487 if (val_a >= bitmap_len || neg) {
2499 err = proc_get_long(&kbuf, &left, &val_b,
2500 &neg, tr_b, sizeof(tr_b),
2504 if (val_b >= bitmap_len || neg ||
2515 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2517 proc_skip_char(&kbuf, &left, '\n');
2521 unsigned long bit_a, bit_b = 0;
2524 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2525 if (bit_a >= bitmap_len)
2527 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2531 err = proc_put_char(&buffer, &left, ',');
2535 err = proc_put_long(&buffer, &left, bit_a, false);
2538 if (bit_a != bit_b) {
2539 err = proc_put_char(&buffer, &left, '-');
2542 err = proc_put_long(&buffer, &left, bit_b, false);
2550 err = proc_put_char(&buffer, &left, '\n');
2556 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2558 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2570 #else /* CONFIG_PROC_SYSCTL */
2572 int proc_dostring(struct ctl_table *table, int write,
2573 void __user *buffer, size_t *lenp, loff_t *ppos)
2578 int proc_dointvec(struct ctl_table *table, int write,
2579 void __user *buffer, size_t *lenp, loff_t *ppos)
2584 int proc_dointvec_minmax(struct ctl_table *table, int write,
2585 void __user *buffer, size_t *lenp, loff_t *ppos)
2590 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2591 void __user *buffer, size_t *lenp, loff_t *ppos)
2596 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2602 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2603 void __user *buffer, size_t *lenp, loff_t *ppos)
2608 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2614 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2615 void __user *buffer,
2616 size_t *lenp, loff_t *ppos)
2622 #endif /* CONFIG_PROC_SYSCTL */
2625 * No sense putting this after each symbol definition, twice,
2626 * exception granted :-)
2628 EXPORT_SYMBOL(proc_dointvec);
2629 EXPORT_SYMBOL(proc_dointvec_jiffies);
2630 EXPORT_SYMBOL(proc_dointvec_minmax);
2631 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2632 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2633 EXPORT_SYMBOL(proc_dostring);
2634 EXPORT_SYMBOL(proc_doulongvec_minmax);
2635 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);