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 extra_free_kbytes;
109 extern int min_free_order_shift;
110 extern int pid_max_min, pid_max_max;
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 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
150 #ifdef CONFIG_DETECT_HUNG_TASK
151 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
154 #ifdef CONFIG_INOTIFY_USER
155 #include <linux/inotify.h>
160 #ifdef CONFIG_SPARC64
161 extern int sysctl_tsb_ratio;
165 extern int pwrsw_enabled;
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
169 extern int unaligned_enabled;
173 extern int unaligned_dump_stack;
176 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
177 extern int no_unaligned_warning;
180 #ifdef CONFIG_PROC_SYSCTL
181 static int proc_do_cad_pid(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 static int proc_taint(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
188 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
192 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
194 #ifdef CONFIG_COREDUMP
195 static int proc_dostring_coredump(struct ctl_table *table, int write,
196 void __user *buffer, size_t *lenp, loff_t *ppos);
199 #ifdef CONFIG_MAGIC_SYSRQ
200 /* Note: sysrq code uses it's own private copy */
201 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
203 static int sysrq_sysctl_handler(ctl_table *table, int write,
204 void __user *buffer, size_t *lenp,
209 error = proc_dointvec(table, write, buffer, lenp, ppos);
214 sysrq_toggle_support(__sysrq_enabled);
221 static struct ctl_table kern_table[];
222 static struct ctl_table vm_table[];
223 static struct ctl_table fs_table[];
224 static struct ctl_table debug_table[];
225 static struct ctl_table dev_table[];
226 extern struct ctl_table random_table[];
228 extern struct ctl_table epoll_table[];
231 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
232 int sysctl_legacy_va_layout;
235 /* The default sysctl tables: */
237 static struct ctl_table sysctl_base_table[] = {
239 .procname = "kernel",
256 .child = debug_table,
266 #ifdef CONFIG_SCHED_DEBUG
267 static int min_sched_granularity_ns = 100000; /* 100 usecs */
268 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 static int min_wakeup_granularity_ns; /* 0 usecs */
270 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
272 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
273 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
274 #endif /* CONFIG_SMP */
275 #endif /* CONFIG_SCHED_DEBUG */
277 #ifdef CONFIG_COMPACTION
278 static int min_extfrag_threshold;
279 static int max_extfrag_threshold = 1000;
282 static struct ctl_table kern_table[] = {
284 .procname = "sched_child_runs_first",
285 .data = &sysctl_sched_child_runs_first,
286 .maxlen = sizeof(unsigned int),
288 .proc_handler = proc_dointvec,
290 #ifdef CONFIG_SCHED_DEBUG
292 .procname = "sched_min_granularity_ns",
293 .data = &sysctl_sched_min_granularity,
294 .maxlen = sizeof(unsigned int),
296 .proc_handler = sched_proc_update_handler,
297 .extra1 = &min_sched_granularity_ns,
298 .extra2 = &max_sched_granularity_ns,
301 .procname = "sched_latency_ns",
302 .data = &sysctl_sched_latency,
303 .maxlen = sizeof(unsigned int),
305 .proc_handler = sched_proc_update_handler,
306 .extra1 = &min_sched_granularity_ns,
307 .extra2 = &max_sched_granularity_ns,
310 .procname = "sched_wakeup_granularity_ns",
311 .data = &sysctl_sched_wakeup_granularity,
312 .maxlen = sizeof(unsigned int),
314 .proc_handler = sched_proc_update_handler,
315 .extra1 = &min_wakeup_granularity_ns,
316 .extra2 = &max_wakeup_granularity_ns,
320 .procname = "sched_tunable_scaling",
321 .data = &sysctl_sched_tunable_scaling,
322 .maxlen = sizeof(enum sched_tunable_scaling),
324 .proc_handler = sched_proc_update_handler,
325 .extra1 = &min_sched_tunable_scaling,
326 .extra2 = &max_sched_tunable_scaling,
329 .procname = "sched_migration_cost_ns",
330 .data = &sysctl_sched_migration_cost,
331 .maxlen = sizeof(unsigned int),
333 .proc_handler = proc_dointvec,
336 .procname = "sched_nr_migrate",
337 .data = &sysctl_sched_nr_migrate,
338 .maxlen = sizeof(unsigned int),
340 .proc_handler = proc_dointvec,
343 .procname = "sched_time_avg_ms",
344 .data = &sysctl_sched_time_avg,
345 .maxlen = sizeof(unsigned int),
347 .proc_handler = proc_dointvec,
350 .procname = "sched_shares_window_ns",
351 .data = &sysctl_sched_shares_window,
352 .maxlen = sizeof(unsigned int),
354 .proc_handler = proc_dointvec,
357 .procname = "timer_migration",
358 .data = &sysctl_timer_migration,
359 .maxlen = sizeof(unsigned int),
361 .proc_handler = proc_dointvec_minmax,
365 #endif /* CONFIG_SMP */
366 #ifdef CONFIG_NUMA_BALANCING
368 .procname = "numa_balancing_scan_delay_ms",
369 .data = &sysctl_numa_balancing_scan_delay,
370 .maxlen = sizeof(unsigned int),
372 .proc_handler = proc_dointvec,
375 .procname = "numa_balancing_scan_period_min_ms",
376 .data = &sysctl_numa_balancing_scan_period_min,
377 .maxlen = sizeof(unsigned int),
379 .proc_handler = proc_dointvec,
382 .procname = "numa_balancing_scan_period_reset",
383 .data = &sysctl_numa_balancing_scan_period_reset,
384 .maxlen = sizeof(unsigned int),
386 .proc_handler = proc_dointvec,
389 .procname = "numa_balancing_scan_period_max_ms",
390 .data = &sysctl_numa_balancing_scan_period_max,
391 .maxlen = sizeof(unsigned int),
393 .proc_handler = proc_dointvec,
396 .procname = "numa_balancing_scan_size_mb",
397 .data = &sysctl_numa_balancing_scan_size,
398 .maxlen = sizeof(unsigned int),
400 .proc_handler = proc_dointvec,
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
405 .procname = "sched_rt_period_us",
406 .data = &sysctl_sched_rt_period,
407 .maxlen = sizeof(unsigned int),
409 .proc_handler = sched_rt_handler,
412 .procname = "sched_rt_runtime_us",
413 .data = &sysctl_sched_rt_runtime,
414 .maxlen = sizeof(int),
416 .proc_handler = sched_rt_handler,
419 .procname = "sched_rr_timeslice_ms",
420 .data = &sched_rr_timeslice,
421 .maxlen = sizeof(int),
423 .proc_handler = sched_rr_handler,
425 #ifdef CONFIG_SCHED_AUTOGROUP
427 .procname = "sched_autogroup_enabled",
428 .data = &sysctl_sched_autogroup_enabled,
429 .maxlen = sizeof(unsigned int),
431 .proc_handler = proc_dointvec_minmax,
436 #ifdef CONFIG_CFS_BANDWIDTH
438 .procname = "sched_cfs_bandwidth_slice_us",
439 .data = &sysctl_sched_cfs_bandwidth_slice,
440 .maxlen = sizeof(unsigned int),
442 .proc_handler = proc_dointvec_minmax,
446 #ifdef CONFIG_PROVE_LOCKING
448 .procname = "prove_locking",
449 .data = &prove_locking,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec,
455 #ifdef CONFIG_LOCK_STAT
457 .procname = "lock_stat",
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec,
466 .data = &panic_timeout,
467 .maxlen = sizeof(int),
469 .proc_handler = proc_dointvec,
471 #ifdef CONFIG_COREDUMP
473 .procname = "core_uses_pid",
474 .data = &core_uses_pid,
475 .maxlen = sizeof(int),
477 .proc_handler = proc_dointvec,
480 .procname = "core_pattern",
481 .data = core_pattern,
482 .maxlen = CORENAME_MAX_SIZE,
484 .proc_handler = proc_dostring_coredump,
487 .procname = "core_pipe_limit",
488 .data = &core_pipe_limit,
489 .maxlen = sizeof(unsigned int),
491 .proc_handler = proc_dointvec,
494 #ifdef CONFIG_PROC_SYSCTL
496 .procname = "tainted",
497 .maxlen = sizeof(long),
499 .proc_handler = proc_taint,
502 #ifdef CONFIG_LATENCYTOP
504 .procname = "latencytop",
505 .data = &latencytop_enabled,
506 .maxlen = sizeof(int),
508 .proc_handler = proc_dointvec,
511 #ifdef CONFIG_BLK_DEV_INITRD
513 .procname = "real-root-dev",
514 .data = &real_root_dev,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec,
521 .procname = "print-fatal-signals",
522 .data = &print_fatal_signals,
523 .maxlen = sizeof(int),
525 .proc_handler = proc_dointvec,
529 .procname = "reboot-cmd",
530 .data = reboot_command,
533 .proc_handler = proc_dostring,
536 .procname = "stop-a",
537 .data = &stop_a_enabled,
538 .maxlen = sizeof (int),
540 .proc_handler = proc_dointvec,
543 .procname = "scons-poweroff",
544 .data = &scons_pwroff,
545 .maxlen = sizeof (int),
547 .proc_handler = proc_dointvec,
550 #ifdef CONFIG_SPARC64
552 .procname = "tsb-ratio",
553 .data = &sysctl_tsb_ratio,
554 .maxlen = sizeof (int),
556 .proc_handler = proc_dointvec,
561 .procname = "soft-power",
562 .data = &pwrsw_enabled,
563 .maxlen = sizeof (int),
565 .proc_handler = proc_dointvec,
568 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
570 .procname = "unaligned-trap",
571 .data = &unaligned_enabled,
572 .maxlen = sizeof (int),
574 .proc_handler = proc_dointvec,
578 .procname = "ctrl-alt-del",
580 .maxlen = sizeof(int),
582 .proc_handler = proc_dointvec,
584 #ifdef CONFIG_FUNCTION_TRACER
586 .procname = "ftrace_enabled",
587 .data = &ftrace_enabled,
588 .maxlen = sizeof(int),
590 .proc_handler = ftrace_enable_sysctl,
593 #ifdef CONFIG_STACK_TRACER
595 .procname = "stack_tracer_enabled",
596 .data = &stack_tracer_enabled,
597 .maxlen = sizeof(int),
599 .proc_handler = stack_trace_sysctl,
602 #ifdef CONFIG_TRACING
604 .procname = "ftrace_dump_on_oops",
605 .data = &ftrace_dump_on_oops,
606 .maxlen = sizeof(int),
608 .proc_handler = proc_dointvec,
611 #ifdef CONFIG_MODULES
613 .procname = "modprobe",
614 .data = &modprobe_path,
615 .maxlen = KMOD_PATH_LEN,
617 .proc_handler = proc_dostring,
620 .procname = "modules_disabled",
621 .data = &modules_disabled,
622 .maxlen = sizeof(int),
624 /* only handle a transition from default "0" to "1" */
625 .proc_handler = proc_dointvec_minmax,
632 .procname = "hotplug",
633 .data = &uevent_helper,
634 .maxlen = UEVENT_HELPER_PATH_LEN,
636 .proc_handler = proc_dostring,
639 #ifdef CONFIG_CHR_DEV_SG
641 .procname = "sg-big-buff",
642 .data = &sg_big_buff,
643 .maxlen = sizeof (int),
645 .proc_handler = proc_dointvec,
648 #ifdef CONFIG_BSD_PROCESS_ACCT
652 .maxlen = 3*sizeof(int),
654 .proc_handler = proc_dointvec,
657 #ifdef CONFIG_MAGIC_SYSRQ
660 .data = &__sysrq_enabled,
661 .maxlen = sizeof (int),
663 .proc_handler = sysrq_sysctl_handler,
666 #ifdef CONFIG_PROC_SYSCTL
668 .procname = "cad_pid",
670 .maxlen = sizeof (int),
672 .proc_handler = proc_do_cad_pid,
676 .procname = "threads-max",
677 .data = &max_threads,
678 .maxlen = sizeof(int),
680 .proc_handler = proc_dointvec,
683 .procname = "random",
685 .child = random_table,
688 .procname = "usermodehelper",
690 .child = usermodehelper_table,
693 .procname = "overflowuid",
694 .data = &overflowuid,
695 .maxlen = sizeof(int),
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &minolduid,
699 .extra2 = &maxolduid,
702 .procname = "overflowgid",
703 .data = &overflowgid,
704 .maxlen = sizeof(int),
706 .proc_handler = proc_dointvec_minmax,
707 .extra1 = &minolduid,
708 .extra2 = &maxolduid,
711 #ifdef CONFIG_MATHEMU
713 .procname = "ieee_emulation_warnings",
714 .data = &sysctl_ieee_emulation_warnings,
715 .maxlen = sizeof(int),
717 .proc_handler = proc_dointvec,
721 .procname = "userprocess_debug",
722 .data = &show_unhandled_signals,
723 .maxlen = sizeof(int),
725 .proc_handler = proc_dointvec,
729 .procname = "pid_max",
731 .maxlen = sizeof (int),
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &pid_max_min,
735 .extra2 = &pid_max_max,
738 .procname = "panic_on_oops",
739 .data = &panic_on_oops,
740 .maxlen = sizeof(int),
742 .proc_handler = proc_dointvec,
744 #if defined CONFIG_PRINTK
746 .procname = "printk",
747 .data = &console_loglevel,
748 .maxlen = 4*sizeof(int),
750 .proc_handler = proc_dointvec,
753 .procname = "printk_ratelimit",
754 .data = &printk_ratelimit_state.interval,
755 .maxlen = sizeof(int),
757 .proc_handler = proc_dointvec_jiffies,
760 .procname = "printk_ratelimit_burst",
761 .data = &printk_ratelimit_state.burst,
762 .maxlen = sizeof(int),
764 .proc_handler = proc_dointvec,
767 .procname = "printk_delay",
768 .data = &printk_delay_msec,
769 .maxlen = sizeof(int),
771 .proc_handler = proc_dointvec_minmax,
773 .extra2 = &ten_thousand,
776 .procname = "dmesg_restrict",
777 .data = &dmesg_restrict,
778 .maxlen = sizeof(int),
780 .proc_handler = proc_dointvec_minmax_sysadmin,
785 .procname = "kptr_restrict",
786 .data = &kptr_restrict,
787 .maxlen = sizeof(int),
789 .proc_handler = proc_dointvec_minmax_sysadmin,
795 .procname = "ngroups_max",
796 .data = &ngroups_max,
797 .maxlen = sizeof (int),
799 .proc_handler = proc_dointvec,
802 .procname = "cap_last_cap",
803 .data = (void *)&cap_last_cap,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec,
808 #if defined(CONFIG_LOCKUP_DETECTOR)
810 .procname = "watchdog",
811 .data = &watchdog_enabled,
812 .maxlen = sizeof (int),
814 .proc_handler = proc_dowatchdog,
819 .procname = "watchdog_thresh",
820 .data = &watchdog_thresh,
821 .maxlen = sizeof(int),
823 .proc_handler = proc_dowatchdog,
828 .procname = "softlockup_panic",
829 .data = &softlockup_panic,
830 .maxlen = sizeof(int),
832 .proc_handler = proc_dointvec_minmax,
837 .procname = "nmi_watchdog",
838 .data = &watchdog_enabled,
839 .maxlen = sizeof (int),
841 .proc_handler = proc_dowatchdog,
846 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
848 .procname = "unknown_nmi_panic",
849 .data = &unknown_nmi_panic,
850 .maxlen = sizeof (int),
852 .proc_handler = proc_dointvec,
855 #if defined(CONFIG_X86)
857 .procname = "panic_on_unrecovered_nmi",
858 .data = &panic_on_unrecovered_nmi,
859 .maxlen = sizeof(int),
861 .proc_handler = proc_dointvec,
864 .procname = "panic_on_io_nmi",
865 .data = &panic_on_io_nmi,
866 .maxlen = sizeof(int),
868 .proc_handler = proc_dointvec,
870 #ifdef CONFIG_DEBUG_STACKOVERFLOW
872 .procname = "panic_on_stackoverflow",
873 .data = &sysctl_panic_on_stackoverflow,
874 .maxlen = sizeof(int),
876 .proc_handler = proc_dointvec,
880 .procname = "bootloader_type",
881 .data = &bootloader_type,
882 .maxlen = sizeof (int),
884 .proc_handler = proc_dointvec,
887 .procname = "bootloader_version",
888 .data = &bootloader_version,
889 .maxlen = sizeof (int),
891 .proc_handler = proc_dointvec,
894 .procname = "kstack_depth_to_print",
895 .data = &kstack_depth_to_print,
896 .maxlen = sizeof(int),
898 .proc_handler = proc_dointvec,
901 .procname = "io_delay_type",
902 .data = &io_delay_type,
903 .maxlen = sizeof(int),
905 .proc_handler = proc_dointvec,
908 #if defined(CONFIG_MMU)
910 .procname = "randomize_va_space",
911 .data = &randomize_va_space,
912 .maxlen = sizeof(int),
914 .proc_handler = proc_dointvec,
917 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
919 .procname = "spin_retry",
921 .maxlen = sizeof (int),
923 .proc_handler = proc_dointvec,
926 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
928 .procname = "acpi_video_flags",
929 .data = &acpi_realmode_flags,
930 .maxlen = sizeof (unsigned long),
932 .proc_handler = proc_doulongvec_minmax,
935 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
937 .procname = "ignore-unaligned-usertrap",
938 .data = &no_unaligned_warning,
939 .maxlen = sizeof (int),
941 .proc_handler = proc_dointvec,
946 .procname = "unaligned-dump-stack",
947 .data = &unaligned_dump_stack,
948 .maxlen = sizeof (int),
950 .proc_handler = proc_dointvec,
953 #ifdef CONFIG_DETECT_HUNG_TASK
955 .procname = "hung_task_panic",
956 .data = &sysctl_hung_task_panic,
957 .maxlen = sizeof(int),
959 .proc_handler = proc_dointvec_minmax,
964 .procname = "hung_task_check_count",
965 .data = &sysctl_hung_task_check_count,
966 .maxlen = sizeof(unsigned long),
968 .proc_handler = proc_doulongvec_minmax,
971 .procname = "hung_task_timeout_secs",
972 .data = &sysctl_hung_task_timeout_secs,
973 .maxlen = sizeof(unsigned long),
975 .proc_handler = proc_dohung_task_timeout_secs,
976 .extra2 = &hung_task_timeout_max,
979 .procname = "hung_task_warnings",
980 .data = &sysctl_hung_task_warnings,
981 .maxlen = sizeof(unsigned long),
983 .proc_handler = proc_doulongvec_minmax,
988 .procname = "compat-log",
990 .maxlen = sizeof (int),
992 .proc_handler = proc_dointvec,
995 #ifdef CONFIG_RT_MUTEXES
997 .procname = "max_lock_depth",
998 .data = &max_lock_depth,
999 .maxlen = sizeof(int),
1001 .proc_handler = proc_dointvec,
1005 .procname = "poweroff_cmd",
1006 .data = &poweroff_cmd,
1007 .maxlen = POWEROFF_CMD_PATH_LEN,
1009 .proc_handler = proc_dostring,
1015 .child = key_sysctls,
1018 #ifdef CONFIG_RCU_TORTURE_TEST
1020 .procname = "rcutorture_runnable",
1021 .data = &rcutorture_runnable,
1022 .maxlen = sizeof(int),
1024 .proc_handler = proc_dointvec,
1027 #ifdef CONFIG_PERF_EVENTS
1029 * User-space scripts rely on the existence of this file
1030 * as a feature check for perf_events being enabled.
1032 * So it's an ABI, do not remove!
1035 .procname = "perf_event_paranoid",
1036 .data = &sysctl_perf_event_paranoid,
1037 .maxlen = sizeof(sysctl_perf_event_paranoid),
1039 .proc_handler = proc_dointvec,
1042 .procname = "perf_event_mlock_kb",
1043 .data = &sysctl_perf_event_mlock,
1044 .maxlen = sizeof(sysctl_perf_event_mlock),
1046 .proc_handler = proc_dointvec,
1049 .procname = "perf_event_max_sample_rate",
1050 .data = &sysctl_perf_event_sample_rate,
1051 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1053 .proc_handler = perf_proc_update_handler,
1056 #ifdef CONFIG_KMEMCHECK
1058 .procname = "kmemcheck",
1059 .data = &kmemcheck_enabled,
1060 .maxlen = sizeof(int),
1062 .proc_handler = proc_dointvec,
1067 .procname = "blk_iopoll",
1068 .data = &blk_iopoll_enabled,
1069 .maxlen = sizeof(int),
1071 .proc_handler = proc_dointvec,
1077 static struct ctl_table vm_table[] = {
1079 .procname = "overcommit_memory",
1080 .data = &sysctl_overcommit_memory,
1081 .maxlen = sizeof(sysctl_overcommit_memory),
1083 .proc_handler = proc_dointvec_minmax,
1088 .procname = "panic_on_oom",
1089 .data = &sysctl_panic_on_oom,
1090 .maxlen = sizeof(sysctl_panic_on_oom),
1092 .proc_handler = proc_dointvec_minmax,
1097 .procname = "oom_kill_allocating_task",
1098 .data = &sysctl_oom_kill_allocating_task,
1099 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1101 .proc_handler = proc_dointvec,
1104 .procname = "oom_dump_tasks",
1105 .data = &sysctl_oom_dump_tasks,
1106 .maxlen = sizeof(sysctl_oom_dump_tasks),
1108 .proc_handler = proc_dointvec,
1111 .procname = "overcommit_ratio",
1112 .data = &sysctl_overcommit_ratio,
1113 .maxlen = sizeof(sysctl_overcommit_ratio),
1115 .proc_handler = proc_dointvec,
1118 .procname = "page-cluster",
1119 .data = &page_cluster,
1120 .maxlen = sizeof(int),
1122 .proc_handler = proc_dointvec_minmax,
1126 .procname = "dirty_background_ratio",
1127 .data = &dirty_background_ratio,
1128 .maxlen = sizeof(dirty_background_ratio),
1130 .proc_handler = dirty_background_ratio_handler,
1132 .extra2 = &one_hundred,
1135 .procname = "dirty_background_bytes",
1136 .data = &dirty_background_bytes,
1137 .maxlen = sizeof(dirty_background_bytes),
1139 .proc_handler = dirty_background_bytes_handler,
1143 .procname = "dirty_ratio",
1144 .data = &vm_dirty_ratio,
1145 .maxlen = sizeof(vm_dirty_ratio),
1147 .proc_handler = dirty_ratio_handler,
1149 .extra2 = &one_hundred,
1152 .procname = "dirty_bytes",
1153 .data = &vm_dirty_bytes,
1154 .maxlen = sizeof(vm_dirty_bytes),
1156 .proc_handler = dirty_bytes_handler,
1157 .extra1 = &dirty_bytes_min,
1160 .procname = "dirty_writeback_centisecs",
1161 .data = &dirty_writeback_interval,
1162 .maxlen = sizeof(dirty_writeback_interval),
1164 .proc_handler = dirty_writeback_centisecs_handler,
1167 .procname = "dirty_expire_centisecs",
1168 .data = &dirty_expire_interval,
1169 .maxlen = sizeof(dirty_expire_interval),
1171 .proc_handler = proc_dointvec_minmax,
1175 .procname = "nr_pdflush_threads",
1176 .mode = 0444 /* read-only */,
1177 .proc_handler = pdflush_proc_obsolete,
1180 .procname = "swappiness",
1181 .data = &vm_swappiness,
1182 .maxlen = sizeof(vm_swappiness),
1184 .proc_handler = proc_dointvec_minmax,
1186 .extra2 = &one_hundred,
1188 #ifdef CONFIG_HUGETLB_PAGE
1190 .procname = "nr_hugepages",
1192 .maxlen = sizeof(unsigned long),
1194 .proc_handler = hugetlb_sysctl_handler,
1195 .extra1 = (void *)&hugetlb_zero,
1196 .extra2 = (void *)&hugetlb_infinity,
1200 .procname = "nr_hugepages_mempolicy",
1202 .maxlen = sizeof(unsigned long),
1204 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1205 .extra1 = (void *)&hugetlb_zero,
1206 .extra2 = (void *)&hugetlb_infinity,
1210 .procname = "hugetlb_shm_group",
1211 .data = &sysctl_hugetlb_shm_group,
1212 .maxlen = sizeof(gid_t),
1214 .proc_handler = proc_dointvec,
1217 .procname = "hugepages_treat_as_movable",
1218 .data = &hugepages_treat_as_movable,
1219 .maxlen = sizeof(int),
1221 .proc_handler = hugetlb_treat_movable_handler,
1224 .procname = "nr_overcommit_hugepages",
1226 .maxlen = sizeof(unsigned long),
1228 .proc_handler = hugetlb_overcommit_handler,
1229 .extra1 = (void *)&hugetlb_zero,
1230 .extra2 = (void *)&hugetlb_infinity,
1234 .procname = "lowmem_reserve_ratio",
1235 .data = &sysctl_lowmem_reserve_ratio,
1236 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1238 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1241 .procname = "drop_caches",
1242 .data = &sysctl_drop_caches,
1243 .maxlen = sizeof(int),
1245 .proc_handler = drop_caches_sysctl_handler,
1249 #ifdef CONFIG_COMPACTION
1251 .procname = "compact_memory",
1252 .data = &sysctl_compact_memory,
1253 .maxlen = sizeof(int),
1255 .proc_handler = sysctl_compaction_handler,
1258 .procname = "extfrag_threshold",
1259 .data = &sysctl_extfrag_threshold,
1260 .maxlen = sizeof(int),
1262 .proc_handler = sysctl_extfrag_handler,
1263 .extra1 = &min_extfrag_threshold,
1264 .extra2 = &max_extfrag_threshold,
1267 #endif /* CONFIG_COMPACTION */
1269 .procname = "min_free_kbytes",
1270 .data = &min_free_kbytes,
1271 .maxlen = sizeof(min_free_kbytes),
1273 .proc_handler = min_free_kbytes_sysctl_handler,
1277 .procname = "extra_free_kbytes",
1278 .data = &extra_free_kbytes,
1279 .maxlen = sizeof(extra_free_kbytes),
1281 .proc_handler = min_free_kbytes_sysctl_handler,
1285 .procname = "min_free_order_shift",
1286 .data = &min_free_order_shift,
1287 .maxlen = sizeof(min_free_order_shift),
1289 .proc_handler = &proc_dointvec
1292 .procname = "percpu_pagelist_fraction",
1293 .data = &percpu_pagelist_fraction,
1294 .maxlen = sizeof(percpu_pagelist_fraction),
1296 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1297 .extra1 = &min_percpu_pagelist_fract,
1301 .procname = "max_map_count",
1302 .data = &sysctl_max_map_count,
1303 .maxlen = sizeof(sysctl_max_map_count),
1305 .proc_handler = proc_dointvec_minmax,
1310 .procname = "nr_trim_pages",
1311 .data = &sysctl_nr_trim_pages,
1312 .maxlen = sizeof(sysctl_nr_trim_pages),
1314 .proc_handler = proc_dointvec_minmax,
1319 .procname = "laptop_mode",
1320 .data = &laptop_mode,
1321 .maxlen = sizeof(laptop_mode),
1323 .proc_handler = proc_dointvec_jiffies,
1326 .procname = "block_dump",
1327 .data = &block_dump,
1328 .maxlen = sizeof(block_dump),
1330 .proc_handler = proc_dointvec,
1334 .procname = "vfs_cache_pressure",
1335 .data = &sysctl_vfs_cache_pressure,
1336 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1338 .proc_handler = proc_dointvec,
1341 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1343 .procname = "legacy_va_layout",
1344 .data = &sysctl_legacy_va_layout,
1345 .maxlen = sizeof(sysctl_legacy_va_layout),
1347 .proc_handler = proc_dointvec,
1353 .procname = "zone_reclaim_mode",
1354 .data = &zone_reclaim_mode,
1355 .maxlen = sizeof(zone_reclaim_mode),
1357 .proc_handler = proc_dointvec,
1361 .procname = "min_unmapped_ratio",
1362 .data = &sysctl_min_unmapped_ratio,
1363 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1365 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1367 .extra2 = &one_hundred,
1370 .procname = "min_slab_ratio",
1371 .data = &sysctl_min_slab_ratio,
1372 .maxlen = sizeof(sysctl_min_slab_ratio),
1374 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1376 .extra2 = &one_hundred,
1381 .procname = "stat_interval",
1382 .data = &sysctl_stat_interval,
1383 .maxlen = sizeof(sysctl_stat_interval),
1385 .proc_handler = proc_dointvec_jiffies,
1390 .procname = "mmap_min_addr",
1391 .data = &dac_mmap_min_addr,
1392 .maxlen = sizeof(unsigned long),
1394 .proc_handler = mmap_min_addr_handler,
1399 .procname = "numa_zonelist_order",
1400 .data = &numa_zonelist_order,
1401 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1403 .proc_handler = numa_zonelist_order_handler,
1406 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1407 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1409 .procname = "vdso_enabled",
1410 .data = &vdso_enabled,
1411 .maxlen = sizeof(vdso_enabled),
1413 .proc_handler = proc_dointvec,
1417 #ifdef CONFIG_HIGHMEM
1419 .procname = "highmem_is_dirtyable",
1420 .data = &vm_highmem_is_dirtyable,
1421 .maxlen = sizeof(vm_highmem_is_dirtyable),
1423 .proc_handler = proc_dointvec_minmax,
1429 .procname = "scan_unevictable_pages",
1430 .data = &scan_unevictable_pages,
1431 .maxlen = sizeof(scan_unevictable_pages),
1433 .proc_handler = scan_unevictable_handler,
1435 #ifdef CONFIG_MEMORY_FAILURE
1437 .procname = "memory_failure_early_kill",
1438 .data = &sysctl_memory_failure_early_kill,
1439 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1441 .proc_handler = proc_dointvec_minmax,
1446 .procname = "memory_failure_recovery",
1447 .data = &sysctl_memory_failure_recovery,
1448 .maxlen = sizeof(sysctl_memory_failure_recovery),
1450 .proc_handler = proc_dointvec_minmax,
1456 .procname = "user_reserve_kbytes",
1457 .data = &sysctl_user_reserve_kbytes,
1458 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1460 .proc_handler = proc_doulongvec_minmax,
1463 .procname = "admin_reserve_kbytes",
1464 .data = &sysctl_admin_reserve_kbytes,
1465 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1467 .proc_handler = proc_doulongvec_minmax,
1472 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1473 static struct ctl_table binfmt_misc_table[] = {
1478 static struct ctl_table fs_table[] = {
1480 .procname = "inode-nr",
1481 .data = &inodes_stat,
1482 .maxlen = 2*sizeof(int),
1484 .proc_handler = proc_nr_inodes,
1487 .procname = "inode-state",
1488 .data = &inodes_stat,
1489 .maxlen = 7*sizeof(int),
1491 .proc_handler = proc_nr_inodes,
1494 .procname = "file-nr",
1495 .data = &files_stat,
1496 .maxlen = sizeof(files_stat),
1498 .proc_handler = proc_nr_files,
1501 .procname = "file-max",
1502 .data = &files_stat.max_files,
1503 .maxlen = sizeof(files_stat.max_files),
1505 .proc_handler = proc_doulongvec_minmax,
1508 .procname = "nr_open",
1509 .data = &sysctl_nr_open,
1510 .maxlen = sizeof(int),
1512 .proc_handler = proc_dointvec_minmax,
1513 .extra1 = &sysctl_nr_open_min,
1514 .extra2 = &sysctl_nr_open_max,
1517 .procname = "dentry-state",
1518 .data = &dentry_stat,
1519 .maxlen = 6*sizeof(int),
1521 .proc_handler = proc_nr_dentry,
1524 .procname = "overflowuid",
1525 .data = &fs_overflowuid,
1526 .maxlen = sizeof(int),
1528 .proc_handler = proc_dointvec_minmax,
1529 .extra1 = &minolduid,
1530 .extra2 = &maxolduid,
1533 .procname = "overflowgid",
1534 .data = &fs_overflowgid,
1535 .maxlen = sizeof(int),
1537 .proc_handler = proc_dointvec_minmax,
1538 .extra1 = &minolduid,
1539 .extra2 = &maxolduid,
1541 #ifdef CONFIG_FILE_LOCKING
1543 .procname = "leases-enable",
1544 .data = &leases_enable,
1545 .maxlen = sizeof(int),
1547 .proc_handler = proc_dointvec,
1550 #ifdef CONFIG_DNOTIFY
1552 .procname = "dir-notify-enable",
1553 .data = &dir_notify_enable,
1554 .maxlen = sizeof(int),
1556 .proc_handler = proc_dointvec,
1560 #ifdef CONFIG_FILE_LOCKING
1562 .procname = "lease-break-time",
1563 .data = &lease_break_time,
1564 .maxlen = sizeof(int),
1566 .proc_handler = proc_dointvec,
1571 .procname = "aio-nr",
1573 .maxlen = sizeof(aio_nr),
1575 .proc_handler = proc_doulongvec_minmax,
1578 .procname = "aio-max-nr",
1579 .data = &aio_max_nr,
1580 .maxlen = sizeof(aio_max_nr),
1582 .proc_handler = proc_doulongvec_minmax,
1584 #endif /* CONFIG_AIO */
1585 #ifdef CONFIG_INOTIFY_USER
1587 .procname = "inotify",
1589 .child = inotify_table,
1594 .procname = "epoll",
1596 .child = epoll_table,
1601 .procname = "protected_symlinks",
1602 .data = &sysctl_protected_symlinks,
1603 .maxlen = sizeof(int),
1605 .proc_handler = proc_dointvec_minmax,
1610 .procname = "protected_hardlinks",
1611 .data = &sysctl_protected_hardlinks,
1612 .maxlen = sizeof(int),
1614 .proc_handler = proc_dointvec_minmax,
1619 .procname = "suid_dumpable",
1620 .data = &suid_dumpable,
1621 .maxlen = sizeof(int),
1623 .proc_handler = proc_dointvec_minmax_coredump,
1627 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1629 .procname = "binfmt_misc",
1631 .child = binfmt_misc_table,
1635 .procname = "pipe-max-size",
1636 .data = &pipe_max_size,
1637 .maxlen = sizeof(int),
1639 .proc_handler = &pipe_proc_fn,
1640 .extra1 = &pipe_min_size,
1645 static struct ctl_table debug_table[] = {
1646 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1648 .procname = "exception-trace",
1649 .data = &show_unhandled_signals,
1650 .maxlen = sizeof(int),
1652 .proc_handler = proc_dointvec
1655 #if defined(CONFIG_OPTPROBES)
1657 .procname = "kprobes-optimization",
1658 .data = &sysctl_kprobes_optimization,
1659 .maxlen = sizeof(int),
1661 .proc_handler = proc_kprobes_optimization_handler,
1669 static struct ctl_table dev_table[] = {
1673 int __init sysctl_init(void)
1675 struct ctl_table_header *hdr;
1677 hdr = register_sysctl_table(sysctl_base_table);
1678 kmemleak_not_leak(hdr);
1682 #endif /* CONFIG_SYSCTL */
1688 #ifdef CONFIG_PROC_SYSCTL
1690 static int _proc_do_string(void* data, int maxlen, int write,
1691 void __user *buffer,
1692 size_t *lenp, loff_t *ppos)
1698 if (!data || !maxlen || !*lenp) {
1706 while (len < *lenp) {
1707 if (get_user(c, p++))
1709 if (c == 0 || c == '\n')
1715 if(copy_from_user(data, buffer, len))
1717 ((char *) data)[len] = 0;
1735 if(copy_to_user(buffer, data, len))
1738 if(put_user('\n', ((char __user *) buffer) + len))
1749 * proc_dostring - read a string sysctl
1750 * @table: the sysctl table
1751 * @write: %TRUE if this is a write to the sysctl file
1752 * @buffer: the user buffer
1753 * @lenp: the size of the user buffer
1754 * @ppos: file position
1756 * Reads/writes a string from/to the user buffer. If the kernel
1757 * buffer provided is not large enough to hold the string, the
1758 * string is truncated. The copied string is %NULL-terminated.
1759 * If the string is being read by the user process, it is copied
1760 * and a newline '\n' is added. It is truncated if the buffer is
1763 * Returns 0 on success.
1765 int proc_dostring(struct ctl_table *table, int write,
1766 void __user *buffer, size_t *lenp, loff_t *ppos)
1768 return _proc_do_string(table->data, table->maxlen, write,
1769 buffer, lenp, ppos);
1772 static size_t proc_skip_spaces(char **buf)
1775 char *tmp = skip_spaces(*buf);
1781 static void proc_skip_char(char **buf, size_t *size, const char v)
1791 #define TMPBUFLEN 22
1793 * proc_get_long - reads an ASCII formatted integer from a user buffer
1795 * @buf: a kernel buffer
1796 * @size: size of the kernel buffer
1797 * @val: this is where the number will be stored
1798 * @neg: set to %TRUE if number is negative
1799 * @perm_tr: a vector which contains the allowed trailers
1800 * @perm_tr_len: size of the perm_tr vector
1801 * @tr: pointer to store the trailer character
1803 * In case of success %0 is returned and @buf and @size are updated with
1804 * the amount of bytes read. If @tr is non-NULL and a trailing
1805 * character exists (size is non-zero after returning from this
1806 * function), @tr is updated with the trailing character.
1808 static int proc_get_long(char **buf, size_t *size,
1809 unsigned long *val, bool *neg,
1810 const char *perm_tr, unsigned perm_tr_len, char *tr)
1813 char *p, tmp[TMPBUFLEN];
1819 if (len > TMPBUFLEN - 1)
1820 len = TMPBUFLEN - 1;
1822 memcpy(tmp, *buf, len);
1826 if (*p == '-' && *size > 1) {
1834 *val = simple_strtoul(p, &p, 0);
1838 /* We don't know if the next char is whitespace thus we may accept
1839 * invalid integers (e.g. 1234...a) or two integers instead of one
1840 * (e.g. 123...1). So lets not allow such large numbers. */
1841 if (len == TMPBUFLEN - 1)
1844 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1847 if (tr && (len < *size))
1857 * proc_put_long - converts an integer to a decimal ASCII formatted string
1859 * @buf: the user buffer
1860 * @size: the size of the user buffer
1861 * @val: the integer to be converted
1862 * @neg: sign of the number, %TRUE for negative
1864 * In case of success %0 is returned and @buf and @size are updated with
1865 * the amount of bytes written.
1867 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1871 char tmp[TMPBUFLEN], *p = tmp;
1873 sprintf(p, "%s%lu", neg ? "-" : "", val);
1877 if (copy_to_user(*buf, tmp, len))
1885 static int proc_put_char(void __user **buf, size_t *size, char c)
1888 char __user **buffer = (char __user **)buf;
1889 if (put_user(c, *buffer))
1891 (*size)--, (*buffer)++;
1897 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1899 int write, void *data)
1902 *valp = *negp ? -*lvalp : *lvalp;
1907 *lvalp = (unsigned long)-val;
1910 *lvalp = (unsigned long)val;
1916 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1918 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1919 int write, void __user *buffer,
1920 size_t *lenp, loff_t *ppos,
1921 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1922 int write, void *data),
1925 int *i, vleft, first = 1, err = 0;
1926 unsigned long page = 0;
1930 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1935 i = (int *) tbl_data;
1936 vleft = table->maxlen / sizeof(*i);
1940 conv = do_proc_dointvec_conv;
1943 if (left > PAGE_SIZE - 1)
1944 left = PAGE_SIZE - 1;
1945 page = __get_free_page(GFP_TEMPORARY);
1946 kbuf = (char *) page;
1949 if (copy_from_user(kbuf, buffer, left)) {
1956 for (; left && vleft--; i++, first=0) {
1961 left -= proc_skip_spaces(&kbuf);
1965 err = proc_get_long(&kbuf, &left, &lval, &neg,
1967 sizeof(proc_wspace_sep), NULL);
1970 if (conv(&neg, &lval, i, 1, data)) {
1975 if (conv(&neg, &lval, i, 0, data)) {
1980 err = proc_put_char(&buffer, &left, '\t');
1983 err = proc_put_long(&buffer, &left, lval, neg);
1989 if (!write && !first && left && !err)
1990 err = proc_put_char(&buffer, &left, '\n');
1991 if (write && !err && left)
1992 left -= proc_skip_spaces(&kbuf);
1997 return err ? : -EINVAL;
2004 static int do_proc_dointvec(struct ctl_table *table, int write,
2005 void __user *buffer, size_t *lenp, loff_t *ppos,
2006 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2007 int write, void *data),
2010 return __do_proc_dointvec(table->data, table, write,
2011 buffer, lenp, ppos, conv, data);
2015 * proc_dointvec - read a vector of integers
2016 * @table: the sysctl table
2017 * @write: %TRUE if this is a write to the sysctl file
2018 * @buffer: the user buffer
2019 * @lenp: the size of the user buffer
2020 * @ppos: file position
2022 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2023 * values from/to the user buffer, treated as an ASCII string.
2025 * Returns 0 on success.
2027 int proc_dointvec(struct ctl_table *table, int write,
2028 void __user *buffer, size_t *lenp, loff_t *ppos)
2030 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2035 * Taint values can only be increased
2036 * This means we can safely use a temporary.
2038 static int proc_taint(struct ctl_table *table, int write,
2039 void __user *buffer, size_t *lenp, loff_t *ppos)
2042 unsigned long tmptaint = get_taint();
2045 if (write && !capable(CAP_SYS_ADMIN))
2050 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2056 * Poor man's atomic or. Not worth adding a primitive
2057 * to everyone's atomic.h for this
2060 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2061 if ((tmptaint >> i) & 1)
2062 add_taint(i, LOCKDEP_STILL_OK);
2069 #ifdef CONFIG_PRINTK
2070 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2071 void __user *buffer, size_t *lenp, loff_t *ppos)
2073 if (write && !capable(CAP_SYS_ADMIN))
2076 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2080 struct do_proc_dointvec_minmax_conv_param {
2085 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2087 int write, void *data)
2089 struct do_proc_dointvec_minmax_conv_param *param = data;
2091 int val = *negp ? -*lvalp : *lvalp;
2092 if ((param->min && *param->min > val) ||
2093 (param->max && *param->max < val))
2100 *lvalp = (unsigned long)-val;
2103 *lvalp = (unsigned long)val;
2110 * proc_dointvec_minmax - read a vector of integers with min/max values
2111 * @table: the sysctl table
2112 * @write: %TRUE if this is a write to the sysctl file
2113 * @buffer: the user buffer
2114 * @lenp: the size of the user buffer
2115 * @ppos: file position
2117 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2118 * values from/to the user buffer, treated as an ASCII string.
2120 * This routine will ensure the values are within the range specified by
2121 * table->extra1 (min) and table->extra2 (max).
2123 * Returns 0 on success.
2125 int proc_dointvec_minmax(struct ctl_table *table, int write,
2126 void __user *buffer, size_t *lenp, loff_t *ppos)
2128 struct do_proc_dointvec_minmax_conv_param param = {
2129 .min = (int *) table->extra1,
2130 .max = (int *) table->extra2,
2132 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2133 do_proc_dointvec_minmax_conv, ¶m);
2136 static void validate_coredump_safety(void)
2138 #ifdef CONFIG_COREDUMP
2139 if (suid_dumpable == SUID_DUMP_ROOT &&
2140 core_pattern[0] != '/' && core_pattern[0] != '|') {
2141 printk(KERN_WARNING "Unsafe core_pattern used with "\
2142 "suid_dumpable=2. Pipe handler or fully qualified "\
2143 "core dump path required.\n");
2148 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2149 void __user *buffer, size_t *lenp, loff_t *ppos)
2151 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2153 validate_coredump_safety();
2157 #ifdef CONFIG_COREDUMP
2158 static int proc_dostring_coredump(struct ctl_table *table, int write,
2159 void __user *buffer, size_t *lenp, loff_t *ppos)
2161 int error = proc_dostring(table, write, buffer, lenp, ppos);
2163 validate_coredump_safety();
2168 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2169 void __user *buffer,
2170 size_t *lenp, loff_t *ppos,
2171 unsigned long convmul,
2172 unsigned long convdiv)
2174 unsigned long *i, *min, *max;
2175 int vleft, first = 1, err = 0;
2176 unsigned long page = 0;
2180 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2185 i = (unsigned long *) data;
2186 min = (unsigned long *) table->extra1;
2187 max = (unsigned long *) table->extra2;
2188 vleft = table->maxlen / sizeof(unsigned long);
2192 if (left > PAGE_SIZE - 1)
2193 left = PAGE_SIZE - 1;
2194 page = __get_free_page(GFP_TEMPORARY);
2195 kbuf = (char *) page;
2198 if (copy_from_user(kbuf, buffer, left)) {
2205 for (; left && vleft--; i++, first = 0) {
2211 left -= proc_skip_spaces(&kbuf);
2213 err = proc_get_long(&kbuf, &left, &val, &neg,
2215 sizeof(proc_wspace_sep), NULL);
2220 if ((min && val < *min) || (max && val > *max))
2224 val = convdiv * (*i) / convmul;
2226 err = proc_put_char(&buffer, &left, '\t');
2227 err = proc_put_long(&buffer, &left, val, false);
2233 if (!write && !first && left && !err)
2234 err = proc_put_char(&buffer, &left, '\n');
2236 left -= proc_skip_spaces(&kbuf);
2241 return err ? : -EINVAL;
2248 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2249 void __user *buffer,
2250 size_t *lenp, loff_t *ppos,
2251 unsigned long convmul,
2252 unsigned long convdiv)
2254 return __do_proc_doulongvec_minmax(table->data, table, write,
2255 buffer, lenp, ppos, convmul, convdiv);
2259 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2260 * @table: the sysctl table
2261 * @write: %TRUE if this is a write to the sysctl file
2262 * @buffer: the user buffer
2263 * @lenp: the size of the user buffer
2264 * @ppos: file position
2266 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2267 * values from/to the user buffer, treated as an ASCII string.
2269 * This routine will ensure the values are within the range specified by
2270 * table->extra1 (min) and table->extra2 (max).
2272 * Returns 0 on success.
2274 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2275 void __user *buffer, size_t *lenp, loff_t *ppos)
2277 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2281 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2282 * @table: the sysctl table
2283 * @write: %TRUE if this is a write to the sysctl file
2284 * @buffer: the user buffer
2285 * @lenp: the size of the user buffer
2286 * @ppos: file position
2288 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2289 * values from/to the user buffer, treated as an ASCII string. The values
2290 * are treated as milliseconds, and converted to jiffies when they are stored.
2292 * This routine will ensure the values are within the range specified by
2293 * table->extra1 (min) and table->extra2 (max).
2295 * Returns 0 on success.
2297 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2298 void __user *buffer,
2299 size_t *lenp, loff_t *ppos)
2301 return do_proc_doulongvec_minmax(table, write, buffer,
2302 lenp, ppos, HZ, 1000l);
2306 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2308 int write, void *data)
2311 if (*lvalp > LONG_MAX / HZ)
2313 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2319 lval = (unsigned long)-val;
2322 lval = (unsigned long)val;
2329 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2331 int write, void *data)
2334 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2336 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2342 lval = (unsigned long)-val;
2345 lval = (unsigned long)val;
2347 *lvalp = jiffies_to_clock_t(lval);
2352 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2354 int write, void *data)
2357 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2363 lval = (unsigned long)-val;
2366 lval = (unsigned long)val;
2368 *lvalp = jiffies_to_msecs(lval);
2374 * proc_dointvec_jiffies - read a vector of integers as seconds
2375 * @table: the sysctl table
2376 * @write: %TRUE if this is a write to the sysctl file
2377 * @buffer: the user buffer
2378 * @lenp: the size of the user buffer
2379 * @ppos: file position
2381 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2382 * values from/to the user buffer, treated as an ASCII string.
2383 * The values read are assumed to be in seconds, and are converted into
2386 * Returns 0 on success.
2388 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2389 void __user *buffer, size_t *lenp, loff_t *ppos)
2391 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2392 do_proc_dointvec_jiffies_conv,NULL);
2396 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2397 * @table: the sysctl table
2398 * @write: %TRUE if this is a write to the sysctl file
2399 * @buffer: the user buffer
2400 * @lenp: the size of the user buffer
2401 * @ppos: pointer to the file position
2403 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2404 * values from/to the user buffer, treated as an ASCII string.
2405 * The values read are assumed to be in 1/USER_HZ seconds, and
2406 * are converted into jiffies.
2408 * Returns 0 on success.
2410 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2411 void __user *buffer, size_t *lenp, loff_t *ppos)
2413 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2414 do_proc_dointvec_userhz_jiffies_conv,NULL);
2418 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2419 * @table: the sysctl table
2420 * @write: %TRUE if this is a write to the sysctl file
2421 * @buffer: the user buffer
2422 * @lenp: the size of the user buffer
2423 * @ppos: file position
2424 * @ppos: the current position in the file
2426 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2427 * values from/to the user buffer, treated as an ASCII string.
2428 * The values read are assumed to be in 1/1000 seconds, and
2429 * are converted into jiffies.
2431 * Returns 0 on success.
2433 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2434 void __user *buffer, size_t *lenp, loff_t *ppos)
2436 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2437 do_proc_dointvec_ms_jiffies_conv, NULL);
2440 static int proc_do_cad_pid(struct ctl_table *table, int write,
2441 void __user *buffer, size_t *lenp, loff_t *ppos)
2443 struct pid *new_pid;
2447 tmp = pid_vnr(cad_pid);
2449 r = __do_proc_dointvec(&tmp, table, write, buffer,
2450 lenp, ppos, NULL, NULL);
2454 new_pid = find_get_pid(tmp);
2458 put_pid(xchg(&cad_pid, new_pid));
2463 * proc_do_large_bitmap - read/write from/to a large bitmap
2464 * @table: the sysctl table
2465 * @write: %TRUE if this is a write to the sysctl file
2466 * @buffer: the user buffer
2467 * @lenp: the size of the user buffer
2468 * @ppos: file position
2470 * The bitmap is stored at table->data and the bitmap length (in bits)
2473 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2474 * large bitmaps may be represented in a compact manner. Writing into
2475 * the file will clear the bitmap then update it with the given input.
2477 * Returns 0 on success.
2479 int proc_do_large_bitmap(struct ctl_table *table, int write,
2480 void __user *buffer, size_t *lenp, loff_t *ppos)
2484 size_t left = *lenp;
2485 unsigned long bitmap_len = table->maxlen;
2486 unsigned long *bitmap = (unsigned long *) table->data;
2487 unsigned long *tmp_bitmap = NULL;
2488 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2490 if (!bitmap_len || !left || (*ppos && !write)) {
2496 unsigned long page = 0;
2499 if (left > PAGE_SIZE - 1)
2500 left = PAGE_SIZE - 1;
2502 page = __get_free_page(GFP_TEMPORARY);
2503 kbuf = (char *) page;
2506 if (copy_from_user(kbuf, buffer, left)) {
2512 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2518 proc_skip_char(&kbuf, &left, '\n');
2519 while (!err && left) {
2520 unsigned long val_a, val_b;
2523 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2527 if (val_a >= bitmap_len || neg) {
2539 err = proc_get_long(&kbuf, &left, &val_b,
2540 &neg, tr_b, sizeof(tr_b),
2544 if (val_b >= bitmap_len || neg ||
2555 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2557 proc_skip_char(&kbuf, &left, '\n');
2561 unsigned long bit_a, bit_b = 0;
2564 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2565 if (bit_a >= bitmap_len)
2567 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2571 err = proc_put_char(&buffer, &left, ',');
2575 err = proc_put_long(&buffer, &left, bit_a, false);
2578 if (bit_a != bit_b) {
2579 err = proc_put_char(&buffer, &left, '-');
2582 err = proc_put_long(&buffer, &left, bit_b, false);
2590 err = proc_put_char(&buffer, &left, '\n');
2596 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2598 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2610 #else /* CONFIG_PROC_SYSCTL */
2612 int proc_dostring(struct ctl_table *table, int write,
2613 void __user *buffer, size_t *lenp, loff_t *ppos)
2618 int proc_dointvec(struct ctl_table *table, int write,
2619 void __user *buffer, size_t *lenp, loff_t *ppos)
2624 int proc_dointvec_minmax(struct ctl_table *table, int write,
2625 void __user *buffer, size_t *lenp, loff_t *ppos)
2630 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2631 void __user *buffer, size_t *lenp, loff_t *ppos)
2636 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2642 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2643 void __user *buffer, size_t *lenp, loff_t *ppos)
2648 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2649 void __user *buffer, size_t *lenp, loff_t *ppos)
2654 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2655 void __user *buffer,
2656 size_t *lenp, loff_t *ppos)
2662 #endif /* CONFIG_PROC_SYSCTL */
2665 * No sense putting this after each symbol definition, twice,
2666 * exception granted :-)
2668 EXPORT_SYMBOL(proc_dointvec);
2669 EXPORT_SYMBOL(proc_dointvec_jiffies);
2670 EXPORT_SYMBOL(proc_dointvec_minmax);
2671 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2672 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2673 EXPORT_SYMBOL(proc_dostring);
2674 EXPORT_SYMBOL(proc_doulongvec_minmax);
2675 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);