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>
65 #include <asm/uaccess.h>
66 #include <asm/processor.h>
70 #include <asm/stacktrace.h>
74 #include <asm/setup.h>
76 #ifdef CONFIG_BSD_PROCESS_ACCT
77 #include <linux/acct.h>
79 #ifdef CONFIG_RT_MUTEXES
80 #include <linux/rtmutex.h>
82 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
83 #include <linux/lockdep.h>
85 #ifdef CONFIG_CHR_DEV_SG
89 #ifdef CONFIG_LOCKUP_DETECTOR
90 #include <linux/nmi.h>
94 #if defined(CONFIG_SYSCTL)
96 /* External variables not in a header file. */
97 extern int sysctl_overcommit_memory;
98 extern int sysctl_overcommit_ratio;
99 extern int max_threads;
100 extern int core_uses_pid;
101 extern int suid_dumpable;
102 extern char core_pattern[];
103 extern unsigned int core_pipe_limit;
105 extern int min_free_kbytes;
106 extern int pid_max_min, pid_max_max;
107 extern int sysctl_drop_caches;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
113 extern int sysctl_nr_trim_pages;
116 extern int blk_iopoll_enabled;
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty = 60;
122 static int neg_one = -1;
126 static int __maybe_unused one = 1;
127 static int __maybe_unused two = 2;
128 static int __maybe_unused three = 3;
129 static unsigned long one_ul = 1;
130 static int one_hundred = 100;
132 static int ten_thousand = 10000;
135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
139 static int maxolduid = 65535;
140 static int minolduid;
141 static int min_percpu_pagelist_fract = 8;
143 static int ngroups_max = NGROUPS_MAX;
144 static const int cap_last_cap = CAP_LAST_CAP;
146 #ifdef CONFIG_INOTIFY_USER
147 #include <linux/inotify.h>
152 #ifdef CONFIG_SPARC64
153 extern int sysctl_tsb_ratio;
157 extern int pwrsw_enabled;
158 extern int unaligned_enabled;
162 extern int no_unaligned_warning;
163 extern int unaligned_dump_stack;
166 #ifdef CONFIG_PROC_SYSCTL
167 static int proc_do_cad_pid(struct ctl_table *table, int write,
168 void __user *buffer, size_t *lenp, loff_t *ppos);
169 static int proc_taint(struct ctl_table *table, int write,
170 void __user *buffer, size_t *lenp, loff_t *ppos);
174 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
175 void __user *buffer, size_t *lenp, loff_t *ppos);
178 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_dostring_coredump(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #ifdef CONFIG_MAGIC_SYSRQ
184 /* Note: sysrq code uses it's own private copy */
185 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
187 static int sysrq_sysctl_handler(ctl_table *table, int write,
188 void __user *buffer, size_t *lenp,
193 error = proc_dointvec(table, write, buffer, lenp, ppos);
198 sysrq_toggle_support(__sysrq_enabled);
205 static struct ctl_table kern_table[];
206 static struct ctl_table vm_table[];
207 static struct ctl_table fs_table[];
208 static struct ctl_table debug_table[];
209 static struct ctl_table dev_table[];
210 extern struct ctl_table random_table[];
212 extern struct ctl_table epoll_table[];
215 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
216 int sysctl_legacy_va_layout;
219 /* The default sysctl tables: */
221 static struct ctl_table sysctl_base_table[] = {
223 .procname = "kernel",
240 .child = debug_table,
250 #ifdef CONFIG_SCHED_DEBUG
251 static int min_sched_granularity_ns = 100000; /* 100 usecs */
252 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
253 static int min_wakeup_granularity_ns; /* 0 usecs */
254 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
255 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
256 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
259 #ifdef CONFIG_COMPACTION
260 static int min_extfrag_threshold;
261 static int max_extfrag_threshold = 1000;
264 static struct ctl_table kern_table[] = {
266 .procname = "sched_child_runs_first",
267 .data = &sysctl_sched_child_runs_first,
268 .maxlen = sizeof(unsigned int),
270 .proc_handler = proc_dointvec,
272 #ifdef CONFIG_SCHED_DEBUG
274 .procname = "sched_min_granularity_ns",
275 .data = &sysctl_sched_min_granularity,
276 .maxlen = sizeof(unsigned int),
278 .proc_handler = sched_proc_update_handler,
279 .extra1 = &min_sched_granularity_ns,
280 .extra2 = &max_sched_granularity_ns,
283 .procname = "sched_latency_ns",
284 .data = &sysctl_sched_latency,
285 .maxlen = sizeof(unsigned int),
287 .proc_handler = sched_proc_update_handler,
288 .extra1 = &min_sched_granularity_ns,
289 .extra2 = &max_sched_granularity_ns,
292 .procname = "sched_wakeup_granularity_ns",
293 .data = &sysctl_sched_wakeup_granularity,
294 .maxlen = sizeof(unsigned int),
296 .proc_handler = sched_proc_update_handler,
297 .extra1 = &min_wakeup_granularity_ns,
298 .extra2 = &max_wakeup_granularity_ns,
301 .procname = "sched_tunable_scaling",
302 .data = &sysctl_sched_tunable_scaling,
303 .maxlen = sizeof(enum sched_tunable_scaling),
305 .proc_handler = sched_proc_update_handler,
306 .extra1 = &min_sched_tunable_scaling,
307 .extra2 = &max_sched_tunable_scaling,
310 .procname = "sched_migration_cost",
311 .data = &sysctl_sched_migration_cost,
312 .maxlen = sizeof(unsigned int),
314 .proc_handler = proc_dointvec,
317 .procname = "sched_nr_migrate",
318 .data = &sysctl_sched_nr_migrate,
319 .maxlen = sizeof(unsigned int),
321 .proc_handler = proc_dointvec,
324 .procname = "sched_time_avg",
325 .data = &sysctl_sched_time_avg,
326 .maxlen = sizeof(unsigned int),
328 .proc_handler = proc_dointvec,
331 .procname = "sched_shares_window",
332 .data = &sysctl_sched_shares_window,
333 .maxlen = sizeof(unsigned int),
335 .proc_handler = proc_dointvec,
338 .procname = "timer_migration",
339 .data = &sysctl_timer_migration,
340 .maxlen = sizeof(unsigned int),
342 .proc_handler = proc_dointvec_minmax,
348 .procname = "sched_rt_period_us",
349 .data = &sysctl_sched_rt_period,
350 .maxlen = sizeof(unsigned int),
352 .proc_handler = sched_rt_handler,
355 .procname = "sched_rt_runtime_us",
356 .data = &sysctl_sched_rt_runtime,
357 .maxlen = sizeof(int),
359 .proc_handler = sched_rt_handler,
361 #ifdef CONFIG_SCHED_AUTOGROUP
363 .procname = "sched_autogroup_enabled",
364 .data = &sysctl_sched_autogroup_enabled,
365 .maxlen = sizeof(unsigned int),
367 .proc_handler = proc_dointvec_minmax,
372 #ifdef CONFIG_CFS_BANDWIDTH
374 .procname = "sched_cfs_bandwidth_slice_us",
375 .data = &sysctl_sched_cfs_bandwidth_slice,
376 .maxlen = sizeof(unsigned int),
378 .proc_handler = proc_dointvec_minmax,
382 #ifdef CONFIG_PROVE_LOCKING
384 .procname = "prove_locking",
385 .data = &prove_locking,
386 .maxlen = sizeof(int),
388 .proc_handler = proc_dointvec,
391 #ifdef CONFIG_LOCK_STAT
393 .procname = "lock_stat",
395 .maxlen = sizeof(int),
397 .proc_handler = proc_dointvec,
402 .data = &panic_timeout,
403 .maxlen = sizeof(int),
405 .proc_handler = proc_dointvec,
408 .procname = "core_uses_pid",
409 .data = &core_uses_pid,
410 .maxlen = sizeof(int),
412 .proc_handler = proc_dointvec,
415 .procname = "core_pattern",
416 .data = core_pattern,
417 .maxlen = CORENAME_MAX_SIZE,
419 .proc_handler = proc_dostring_coredump,
422 .procname = "core_pipe_limit",
423 .data = &core_pipe_limit,
424 .maxlen = sizeof(unsigned int),
426 .proc_handler = proc_dointvec,
428 #ifdef CONFIG_PROC_SYSCTL
430 .procname = "tainted",
431 .maxlen = sizeof(long),
433 .proc_handler = proc_taint,
436 #ifdef CONFIG_LATENCYTOP
438 .procname = "latencytop",
439 .data = &latencytop_enabled,
440 .maxlen = sizeof(int),
442 .proc_handler = proc_dointvec,
445 #ifdef CONFIG_BLK_DEV_INITRD
447 .procname = "real-root-dev",
448 .data = &real_root_dev,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec,
455 .procname = "print-fatal-signals",
456 .data = &print_fatal_signals,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec,
463 .procname = "reboot-cmd",
464 .data = reboot_command,
467 .proc_handler = proc_dostring,
470 .procname = "stop-a",
471 .data = &stop_a_enabled,
472 .maxlen = sizeof (int),
474 .proc_handler = proc_dointvec,
477 .procname = "scons-poweroff",
478 .data = &scons_pwroff,
479 .maxlen = sizeof (int),
481 .proc_handler = proc_dointvec,
484 #ifdef CONFIG_SPARC64
486 .procname = "tsb-ratio",
487 .data = &sysctl_tsb_ratio,
488 .maxlen = sizeof (int),
490 .proc_handler = proc_dointvec,
495 .procname = "soft-power",
496 .data = &pwrsw_enabled,
497 .maxlen = sizeof (int),
499 .proc_handler = proc_dointvec,
502 .procname = "unaligned-trap",
503 .data = &unaligned_enabled,
504 .maxlen = sizeof (int),
506 .proc_handler = proc_dointvec,
510 .procname = "ctrl-alt-del",
512 .maxlen = sizeof(int),
514 .proc_handler = proc_dointvec,
516 #ifdef CONFIG_FUNCTION_TRACER
518 .procname = "ftrace_enabled",
519 .data = &ftrace_enabled,
520 .maxlen = sizeof(int),
522 .proc_handler = ftrace_enable_sysctl,
525 #ifdef CONFIG_STACK_TRACER
527 .procname = "stack_tracer_enabled",
528 .data = &stack_tracer_enabled,
529 .maxlen = sizeof(int),
531 .proc_handler = stack_trace_sysctl,
534 #ifdef CONFIG_TRACING
536 .procname = "ftrace_dump_on_oops",
537 .data = &ftrace_dump_on_oops,
538 .maxlen = sizeof(int),
540 .proc_handler = proc_dointvec,
543 #ifdef CONFIG_MODULES
545 .procname = "modprobe",
546 .data = &modprobe_path,
547 .maxlen = KMOD_PATH_LEN,
549 .proc_handler = proc_dostring,
552 .procname = "modules_disabled",
553 .data = &modules_disabled,
554 .maxlen = sizeof(int),
556 /* only handle a transition from default "0" to "1" */
557 .proc_handler = proc_dointvec_minmax,
562 #ifdef CONFIG_HOTPLUG
564 .procname = "hotplug",
565 .data = &uevent_helper,
566 .maxlen = UEVENT_HELPER_PATH_LEN,
568 .proc_handler = proc_dostring,
571 #ifdef CONFIG_CHR_DEV_SG
573 .procname = "sg-big-buff",
574 .data = &sg_big_buff,
575 .maxlen = sizeof (int),
577 .proc_handler = proc_dointvec,
580 #ifdef CONFIG_BSD_PROCESS_ACCT
584 .maxlen = 3*sizeof(int),
586 .proc_handler = proc_dointvec,
589 #ifdef CONFIG_MAGIC_SYSRQ
592 .data = &__sysrq_enabled,
593 .maxlen = sizeof (int),
595 .proc_handler = sysrq_sysctl_handler,
598 #ifdef CONFIG_PROC_SYSCTL
600 .procname = "cad_pid",
602 .maxlen = sizeof (int),
604 .proc_handler = proc_do_cad_pid,
608 .procname = "threads-max",
609 .data = &max_threads,
610 .maxlen = sizeof(int),
612 .proc_handler = proc_dointvec,
615 .procname = "random",
617 .child = random_table,
620 .procname = "usermodehelper",
622 .child = usermodehelper_table,
625 .procname = "overflowuid",
626 .data = &overflowuid,
627 .maxlen = sizeof(int),
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
634 .procname = "overflowgid",
635 .data = &overflowgid,
636 .maxlen = sizeof(int),
638 .proc_handler = proc_dointvec_minmax,
639 .extra1 = &minolduid,
640 .extra2 = &maxolduid,
643 #ifdef CONFIG_MATHEMU
645 .procname = "ieee_emulation_warnings",
646 .data = &sysctl_ieee_emulation_warnings,
647 .maxlen = sizeof(int),
649 .proc_handler = proc_dointvec,
653 .procname = "userprocess_debug",
654 .data = &show_unhandled_signals,
655 .maxlen = sizeof(int),
657 .proc_handler = proc_dointvec,
661 .procname = "pid_max",
663 .maxlen = sizeof (int),
665 .proc_handler = proc_dointvec_minmax,
666 .extra1 = &pid_max_min,
667 .extra2 = &pid_max_max,
670 .procname = "panic_on_oops",
671 .data = &panic_on_oops,
672 .maxlen = sizeof(int),
674 .proc_handler = proc_dointvec,
676 #if defined CONFIG_PRINTK
678 .procname = "printk",
679 .data = &console_loglevel,
680 .maxlen = 4*sizeof(int),
682 .proc_handler = proc_dointvec,
685 .procname = "printk_ratelimit",
686 .data = &printk_ratelimit_state.interval,
687 .maxlen = sizeof(int),
689 .proc_handler = proc_dointvec_jiffies,
692 .procname = "printk_ratelimit_burst",
693 .data = &printk_ratelimit_state.burst,
694 .maxlen = sizeof(int),
696 .proc_handler = proc_dointvec,
699 .procname = "printk_delay",
700 .data = &printk_delay_msec,
701 .maxlen = sizeof(int),
703 .proc_handler = proc_dointvec_minmax,
705 .extra2 = &ten_thousand,
708 .procname = "dmesg_restrict",
709 .data = &dmesg_restrict,
710 .maxlen = sizeof(int),
712 .proc_handler = proc_dointvec_minmax_sysadmin,
717 .procname = "kptr_restrict",
718 .data = &kptr_restrict,
719 .maxlen = sizeof(int),
721 .proc_handler = proc_dointvec_minmax_sysadmin,
727 .procname = "ngroups_max",
728 .data = &ngroups_max,
729 .maxlen = sizeof (int),
731 .proc_handler = proc_dointvec,
734 .procname = "cap_last_cap",
735 .data = (void *)&cap_last_cap,
736 .maxlen = sizeof(int),
738 .proc_handler = proc_dointvec,
740 #if defined(CONFIG_LOCKUP_DETECTOR)
742 .procname = "watchdog",
743 .data = &watchdog_enabled,
744 .maxlen = sizeof (int),
746 .proc_handler = proc_dowatchdog,
751 .procname = "watchdog_thresh",
752 .data = &watchdog_thresh,
753 .maxlen = sizeof(int),
755 .proc_handler = proc_dowatchdog,
760 .procname = "softlockup_panic",
761 .data = &softlockup_panic,
762 .maxlen = sizeof(int),
764 .proc_handler = proc_dointvec_minmax,
769 .procname = "nmi_watchdog",
770 .data = &watchdog_enabled,
771 .maxlen = sizeof (int),
773 .proc_handler = proc_dowatchdog,
778 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
780 .procname = "unknown_nmi_panic",
781 .data = &unknown_nmi_panic,
782 .maxlen = sizeof (int),
784 .proc_handler = proc_dointvec,
787 #if defined(CONFIG_X86)
789 .procname = "panic_on_unrecovered_nmi",
790 .data = &panic_on_unrecovered_nmi,
791 .maxlen = sizeof(int),
793 .proc_handler = proc_dointvec,
796 .procname = "panic_on_io_nmi",
797 .data = &panic_on_io_nmi,
798 .maxlen = sizeof(int),
800 .proc_handler = proc_dointvec,
802 #ifdef CONFIG_DEBUG_STACKOVERFLOW
804 .procname = "panic_on_stackoverflow",
805 .data = &sysctl_panic_on_stackoverflow,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec,
812 .procname = "bootloader_type",
813 .data = &bootloader_type,
814 .maxlen = sizeof (int),
816 .proc_handler = proc_dointvec,
819 .procname = "bootloader_version",
820 .data = &bootloader_version,
821 .maxlen = sizeof (int),
823 .proc_handler = proc_dointvec,
826 .procname = "kstack_depth_to_print",
827 .data = &kstack_depth_to_print,
828 .maxlen = sizeof(int),
830 .proc_handler = proc_dointvec,
833 .procname = "io_delay_type",
834 .data = &io_delay_type,
835 .maxlen = sizeof(int),
837 .proc_handler = proc_dointvec,
840 #if defined(CONFIG_MMU)
842 .procname = "randomize_va_space",
843 .data = &randomize_va_space,
844 .maxlen = sizeof(int),
846 .proc_handler = proc_dointvec,
849 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
851 .procname = "spin_retry",
853 .maxlen = sizeof (int),
855 .proc_handler = proc_dointvec,
858 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
860 .procname = "acpi_video_flags",
861 .data = &acpi_realmode_flags,
862 .maxlen = sizeof (unsigned long),
864 .proc_handler = proc_doulongvec_minmax,
869 .procname = "ignore-unaligned-usertrap",
870 .data = &no_unaligned_warning,
871 .maxlen = sizeof (int),
873 .proc_handler = proc_dointvec,
876 .procname = "unaligned-dump-stack",
877 .data = &unaligned_dump_stack,
878 .maxlen = sizeof (int),
880 .proc_handler = proc_dointvec,
883 #ifdef CONFIG_DETECT_HUNG_TASK
885 .procname = "hung_task_panic",
886 .data = &sysctl_hung_task_panic,
887 .maxlen = sizeof(int),
889 .proc_handler = proc_dointvec_minmax,
894 .procname = "hung_task_check_count",
895 .data = &sysctl_hung_task_check_count,
896 .maxlen = sizeof(unsigned long),
898 .proc_handler = proc_doulongvec_minmax,
901 .procname = "hung_task_timeout_secs",
902 .data = &sysctl_hung_task_timeout_secs,
903 .maxlen = sizeof(unsigned long),
905 .proc_handler = proc_dohung_task_timeout_secs,
908 .procname = "hung_task_warnings",
909 .data = &sysctl_hung_task_warnings,
910 .maxlen = sizeof(unsigned long),
912 .proc_handler = proc_doulongvec_minmax,
917 .procname = "compat-log",
919 .maxlen = sizeof (int),
921 .proc_handler = proc_dointvec,
924 #ifdef CONFIG_RT_MUTEXES
926 .procname = "max_lock_depth",
927 .data = &max_lock_depth,
928 .maxlen = sizeof(int),
930 .proc_handler = proc_dointvec,
934 .procname = "poweroff_cmd",
935 .data = &poweroff_cmd,
936 .maxlen = POWEROFF_CMD_PATH_LEN,
938 .proc_handler = proc_dostring,
944 .child = key_sysctls,
947 #ifdef CONFIG_RCU_TORTURE_TEST
949 .procname = "rcutorture_runnable",
950 .data = &rcutorture_runnable,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec,
956 #ifdef CONFIG_PERF_EVENTS
958 * User-space scripts rely on the existence of this file
959 * as a feature check for perf_events being enabled.
961 * So it's an ABI, do not remove!
964 .procname = "perf_event_paranoid",
965 .data = &sysctl_perf_event_paranoid,
966 .maxlen = sizeof(sysctl_perf_event_paranoid),
968 .proc_handler = proc_dointvec,
971 .procname = "perf_event_mlock_kb",
972 .data = &sysctl_perf_event_mlock,
973 .maxlen = sizeof(sysctl_perf_event_mlock),
975 .proc_handler = proc_dointvec,
978 .procname = "perf_event_max_sample_rate",
979 .data = &sysctl_perf_event_sample_rate,
980 .maxlen = sizeof(sysctl_perf_event_sample_rate),
982 .proc_handler = perf_proc_update_handler,
985 #ifdef CONFIG_KMEMCHECK
987 .procname = "kmemcheck",
988 .data = &kmemcheck_enabled,
989 .maxlen = sizeof(int),
991 .proc_handler = proc_dointvec,
996 .procname = "blk_iopoll",
997 .data = &blk_iopoll_enabled,
998 .maxlen = sizeof(int),
1000 .proc_handler = proc_dointvec,
1006 static struct ctl_table vm_table[] = {
1008 .procname = "overcommit_memory",
1009 .data = &sysctl_overcommit_memory,
1010 .maxlen = sizeof(sysctl_overcommit_memory),
1012 .proc_handler = proc_dointvec_minmax,
1017 .procname = "panic_on_oom",
1018 .data = &sysctl_panic_on_oom,
1019 .maxlen = sizeof(sysctl_panic_on_oom),
1021 .proc_handler = proc_dointvec_minmax,
1026 .procname = "oom_kill_allocating_task",
1027 .data = &sysctl_oom_kill_allocating_task,
1028 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1030 .proc_handler = proc_dointvec,
1033 .procname = "oom_dump_tasks",
1034 .data = &sysctl_oom_dump_tasks,
1035 .maxlen = sizeof(sysctl_oom_dump_tasks),
1037 .proc_handler = proc_dointvec,
1040 .procname = "overcommit_ratio",
1041 .data = &sysctl_overcommit_ratio,
1042 .maxlen = sizeof(sysctl_overcommit_ratio),
1044 .proc_handler = proc_dointvec,
1047 .procname = "page-cluster",
1048 .data = &page_cluster,
1049 .maxlen = sizeof(int),
1051 .proc_handler = proc_dointvec_minmax,
1055 .procname = "dirty_background_ratio",
1056 .data = &dirty_background_ratio,
1057 .maxlen = sizeof(dirty_background_ratio),
1059 .proc_handler = dirty_background_ratio_handler,
1061 .extra2 = &one_hundred,
1064 .procname = "dirty_background_bytes",
1065 .data = &dirty_background_bytes,
1066 .maxlen = sizeof(dirty_background_bytes),
1068 .proc_handler = dirty_background_bytes_handler,
1072 .procname = "dirty_ratio",
1073 .data = &vm_dirty_ratio,
1074 .maxlen = sizeof(vm_dirty_ratio),
1076 .proc_handler = dirty_ratio_handler,
1078 .extra2 = &one_hundred,
1081 .procname = "dirty_bytes",
1082 .data = &vm_dirty_bytes,
1083 .maxlen = sizeof(vm_dirty_bytes),
1085 .proc_handler = dirty_bytes_handler,
1086 .extra1 = &dirty_bytes_min,
1089 .procname = "dirty_writeback_centisecs",
1090 .data = &dirty_writeback_interval,
1091 .maxlen = sizeof(dirty_writeback_interval),
1093 .proc_handler = dirty_writeback_centisecs_handler,
1096 .procname = "dirty_expire_centisecs",
1097 .data = &dirty_expire_interval,
1098 .maxlen = sizeof(dirty_expire_interval),
1100 .proc_handler = proc_dointvec_minmax,
1104 .procname = "nr_pdflush_threads",
1105 .mode = 0444 /* read-only */,
1106 .proc_handler = pdflush_proc_obsolete,
1109 .procname = "swappiness",
1110 .data = &vm_swappiness,
1111 .maxlen = sizeof(vm_swappiness),
1113 .proc_handler = proc_dointvec_minmax,
1115 .extra2 = &one_hundred,
1117 #ifdef CONFIG_HUGETLB_PAGE
1119 .procname = "nr_hugepages",
1121 .maxlen = sizeof(unsigned long),
1123 .proc_handler = hugetlb_sysctl_handler,
1124 .extra1 = (void *)&hugetlb_zero,
1125 .extra2 = (void *)&hugetlb_infinity,
1129 .procname = "nr_hugepages_mempolicy",
1131 .maxlen = sizeof(unsigned long),
1133 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1134 .extra1 = (void *)&hugetlb_zero,
1135 .extra2 = (void *)&hugetlb_infinity,
1139 .procname = "hugetlb_shm_group",
1140 .data = &sysctl_hugetlb_shm_group,
1141 .maxlen = sizeof(gid_t),
1143 .proc_handler = proc_dointvec,
1146 .procname = "hugepages_treat_as_movable",
1147 .data = &hugepages_treat_as_movable,
1148 .maxlen = sizeof(int),
1150 .proc_handler = hugetlb_treat_movable_handler,
1153 .procname = "nr_overcommit_hugepages",
1155 .maxlen = sizeof(unsigned long),
1157 .proc_handler = hugetlb_overcommit_handler,
1158 .extra1 = (void *)&hugetlb_zero,
1159 .extra2 = (void *)&hugetlb_infinity,
1163 .procname = "lowmem_reserve_ratio",
1164 .data = &sysctl_lowmem_reserve_ratio,
1165 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1167 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1170 .procname = "drop_caches",
1171 .data = &sysctl_drop_caches,
1172 .maxlen = sizeof(int),
1174 .proc_handler = drop_caches_sysctl_handler,
1178 #ifdef CONFIG_COMPACTION
1180 .procname = "compact_memory",
1181 .data = &sysctl_compact_memory,
1182 .maxlen = sizeof(int),
1184 .proc_handler = sysctl_compaction_handler,
1187 .procname = "extfrag_threshold",
1188 .data = &sysctl_extfrag_threshold,
1189 .maxlen = sizeof(int),
1191 .proc_handler = sysctl_extfrag_handler,
1192 .extra1 = &min_extfrag_threshold,
1193 .extra2 = &max_extfrag_threshold,
1196 #endif /* CONFIG_COMPACTION */
1198 .procname = "min_free_kbytes",
1199 .data = &min_free_kbytes,
1200 .maxlen = sizeof(min_free_kbytes),
1202 .proc_handler = min_free_kbytes_sysctl_handler,
1206 .procname = "percpu_pagelist_fraction",
1207 .data = &percpu_pagelist_fraction,
1208 .maxlen = sizeof(percpu_pagelist_fraction),
1210 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1211 .extra1 = &min_percpu_pagelist_fract,
1215 .procname = "max_map_count",
1216 .data = &sysctl_max_map_count,
1217 .maxlen = sizeof(sysctl_max_map_count),
1219 .proc_handler = proc_dointvec_minmax,
1224 .procname = "nr_trim_pages",
1225 .data = &sysctl_nr_trim_pages,
1226 .maxlen = sizeof(sysctl_nr_trim_pages),
1228 .proc_handler = proc_dointvec_minmax,
1233 .procname = "laptop_mode",
1234 .data = &laptop_mode,
1235 .maxlen = sizeof(laptop_mode),
1237 .proc_handler = proc_dointvec_jiffies,
1240 .procname = "block_dump",
1241 .data = &block_dump,
1242 .maxlen = sizeof(block_dump),
1244 .proc_handler = proc_dointvec,
1248 .procname = "vfs_cache_pressure",
1249 .data = &sysctl_vfs_cache_pressure,
1250 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1252 .proc_handler = proc_dointvec,
1255 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1257 .procname = "legacy_va_layout",
1258 .data = &sysctl_legacy_va_layout,
1259 .maxlen = sizeof(sysctl_legacy_va_layout),
1261 .proc_handler = proc_dointvec,
1267 .procname = "zone_reclaim_mode",
1268 .data = &zone_reclaim_mode,
1269 .maxlen = sizeof(zone_reclaim_mode),
1271 .proc_handler = proc_dointvec,
1275 .procname = "min_unmapped_ratio",
1276 .data = &sysctl_min_unmapped_ratio,
1277 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1279 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1281 .extra2 = &one_hundred,
1284 .procname = "min_slab_ratio",
1285 .data = &sysctl_min_slab_ratio,
1286 .maxlen = sizeof(sysctl_min_slab_ratio),
1288 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1290 .extra2 = &one_hundred,
1295 .procname = "stat_interval",
1296 .data = &sysctl_stat_interval,
1297 .maxlen = sizeof(sysctl_stat_interval),
1299 .proc_handler = proc_dointvec_jiffies,
1304 .procname = "mmap_min_addr",
1305 .data = &dac_mmap_min_addr,
1306 .maxlen = sizeof(unsigned long),
1308 .proc_handler = mmap_min_addr_handler,
1313 .procname = "numa_zonelist_order",
1314 .data = &numa_zonelist_order,
1315 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1317 .proc_handler = numa_zonelist_order_handler,
1320 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1321 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1323 .procname = "vdso_enabled",
1324 .data = &vdso_enabled,
1325 .maxlen = sizeof(vdso_enabled),
1327 .proc_handler = proc_dointvec,
1331 #ifdef CONFIG_HIGHMEM
1333 .procname = "highmem_is_dirtyable",
1334 .data = &vm_highmem_is_dirtyable,
1335 .maxlen = sizeof(vm_highmem_is_dirtyable),
1337 .proc_handler = proc_dointvec_minmax,
1343 .procname = "scan_unevictable_pages",
1344 .data = &scan_unevictable_pages,
1345 .maxlen = sizeof(scan_unevictable_pages),
1347 .proc_handler = scan_unevictable_handler,
1349 #ifdef CONFIG_MEMORY_FAILURE
1351 .procname = "memory_failure_early_kill",
1352 .data = &sysctl_memory_failure_early_kill,
1353 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1355 .proc_handler = proc_dointvec_minmax,
1360 .procname = "memory_failure_recovery",
1361 .data = &sysctl_memory_failure_recovery,
1362 .maxlen = sizeof(sysctl_memory_failure_recovery),
1364 .proc_handler = proc_dointvec_minmax,
1372 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1373 static struct ctl_table binfmt_misc_table[] = {
1378 static struct ctl_table fs_table[] = {
1380 .procname = "inode-nr",
1381 .data = &inodes_stat,
1382 .maxlen = 2*sizeof(int),
1384 .proc_handler = proc_nr_inodes,
1387 .procname = "inode-state",
1388 .data = &inodes_stat,
1389 .maxlen = 7*sizeof(int),
1391 .proc_handler = proc_nr_inodes,
1394 .procname = "file-nr",
1395 .data = &files_stat,
1396 .maxlen = sizeof(files_stat),
1398 .proc_handler = proc_nr_files,
1401 .procname = "file-max",
1402 .data = &files_stat.max_files,
1403 .maxlen = sizeof(files_stat.max_files),
1405 .proc_handler = proc_doulongvec_minmax,
1408 .procname = "nr_open",
1409 .data = &sysctl_nr_open,
1410 .maxlen = sizeof(int),
1412 .proc_handler = proc_dointvec_minmax,
1413 .extra1 = &sysctl_nr_open_min,
1414 .extra2 = &sysctl_nr_open_max,
1417 .procname = "dentry-state",
1418 .data = &dentry_stat,
1419 .maxlen = 6*sizeof(int),
1421 .proc_handler = proc_nr_dentry,
1424 .procname = "overflowuid",
1425 .data = &fs_overflowuid,
1426 .maxlen = sizeof(int),
1428 .proc_handler = proc_dointvec_minmax,
1429 .extra1 = &minolduid,
1430 .extra2 = &maxolduid,
1433 .procname = "overflowgid",
1434 .data = &fs_overflowgid,
1435 .maxlen = sizeof(int),
1437 .proc_handler = proc_dointvec_minmax,
1438 .extra1 = &minolduid,
1439 .extra2 = &maxolduid,
1441 #ifdef CONFIG_FILE_LOCKING
1443 .procname = "leases-enable",
1444 .data = &leases_enable,
1445 .maxlen = sizeof(int),
1447 .proc_handler = proc_dointvec,
1450 #ifdef CONFIG_DNOTIFY
1452 .procname = "dir-notify-enable",
1453 .data = &dir_notify_enable,
1454 .maxlen = sizeof(int),
1456 .proc_handler = proc_dointvec,
1460 #ifdef CONFIG_FILE_LOCKING
1462 .procname = "lease-break-time",
1463 .data = &lease_break_time,
1464 .maxlen = sizeof(int),
1466 .proc_handler = proc_dointvec,
1471 .procname = "aio-nr",
1473 .maxlen = sizeof(aio_nr),
1475 .proc_handler = proc_doulongvec_minmax,
1478 .procname = "aio-max-nr",
1479 .data = &aio_max_nr,
1480 .maxlen = sizeof(aio_max_nr),
1482 .proc_handler = proc_doulongvec_minmax,
1484 #endif /* CONFIG_AIO */
1485 #ifdef CONFIG_INOTIFY_USER
1487 .procname = "inotify",
1489 .child = inotify_table,
1494 .procname = "epoll",
1496 .child = epoll_table,
1501 .procname = "suid_dumpable",
1502 .data = &suid_dumpable,
1503 .maxlen = sizeof(int),
1505 .proc_handler = proc_dointvec_minmax_coredump,
1509 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1511 .procname = "binfmt_misc",
1513 .child = binfmt_misc_table,
1517 .procname = "pipe-max-size",
1518 .data = &pipe_max_size,
1519 .maxlen = sizeof(int),
1521 .proc_handler = &pipe_proc_fn,
1522 .extra1 = &pipe_min_size,
1527 static struct ctl_table debug_table[] = {
1528 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1529 defined(CONFIG_S390) || defined(CONFIG_TILE)
1531 .procname = "exception-trace",
1532 .data = &show_unhandled_signals,
1533 .maxlen = sizeof(int),
1535 .proc_handler = proc_dointvec
1538 #if defined(CONFIG_OPTPROBES)
1540 .procname = "kprobes-optimization",
1541 .data = &sysctl_kprobes_optimization,
1542 .maxlen = sizeof(int),
1544 .proc_handler = proc_kprobes_optimization_handler,
1552 static struct ctl_table dev_table[] = {
1556 int __init sysctl_init(void)
1558 struct ctl_table_header *hdr;
1560 hdr = register_sysctl_table(sysctl_base_table);
1561 kmemleak_not_leak(hdr);
1565 #endif /* CONFIG_SYSCTL */
1571 #ifdef CONFIG_PROC_SYSCTL
1573 static int _proc_do_string(void* data, int maxlen, int write,
1574 void __user *buffer,
1575 size_t *lenp, loff_t *ppos)
1581 if (!data || !maxlen || !*lenp) {
1589 while (len < *lenp) {
1590 if (get_user(c, p++))
1592 if (c == 0 || c == '\n')
1598 if(copy_from_user(data, buffer, len))
1600 ((char *) data)[len] = 0;
1618 if(copy_to_user(buffer, data, len))
1621 if(put_user('\n', ((char __user *) buffer) + len))
1632 * proc_dostring - read a string sysctl
1633 * @table: the sysctl table
1634 * @write: %TRUE if this is a write to the sysctl file
1635 * @buffer: the user buffer
1636 * @lenp: the size of the user buffer
1637 * @ppos: file position
1639 * Reads/writes a string from/to the user buffer. If the kernel
1640 * buffer provided is not large enough to hold the string, the
1641 * string is truncated. The copied string is %NULL-terminated.
1642 * If the string is being read by the user process, it is copied
1643 * and a newline '\n' is added. It is truncated if the buffer is
1646 * Returns 0 on success.
1648 int proc_dostring(struct ctl_table *table, int write,
1649 void __user *buffer, size_t *lenp, loff_t *ppos)
1651 return _proc_do_string(table->data, table->maxlen, write,
1652 buffer, lenp, ppos);
1655 static size_t proc_skip_spaces(char **buf)
1658 char *tmp = skip_spaces(*buf);
1664 static void proc_skip_char(char **buf, size_t *size, const char v)
1674 #define TMPBUFLEN 22
1676 * proc_get_long - reads an ASCII formatted integer from a user buffer
1678 * @buf: a kernel buffer
1679 * @size: size of the kernel buffer
1680 * @val: this is where the number will be stored
1681 * @neg: set to %TRUE if number is negative
1682 * @perm_tr: a vector which contains the allowed trailers
1683 * @perm_tr_len: size of the perm_tr vector
1684 * @tr: pointer to store the trailer character
1686 * In case of success %0 is returned and @buf and @size are updated with
1687 * the amount of bytes read. If @tr is non-NULL and a trailing
1688 * character exists (size is non-zero after returning from this
1689 * function), @tr is updated with the trailing character.
1691 static int proc_get_long(char **buf, size_t *size,
1692 unsigned long *val, bool *neg,
1693 const char *perm_tr, unsigned perm_tr_len, char *tr)
1696 char *p, tmp[TMPBUFLEN];
1702 if (len > TMPBUFLEN - 1)
1703 len = TMPBUFLEN - 1;
1705 memcpy(tmp, *buf, len);
1709 if (*p == '-' && *size > 1) {
1717 *val = simple_strtoul(p, &p, 0);
1721 /* We don't know if the next char is whitespace thus we may accept
1722 * invalid integers (e.g. 1234...a) or two integers instead of one
1723 * (e.g. 123...1). So lets not allow such large numbers. */
1724 if (len == TMPBUFLEN - 1)
1727 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1730 if (tr && (len < *size))
1740 * proc_put_long - converts an integer to a decimal ASCII formatted string
1742 * @buf: the user buffer
1743 * @size: the size of the user buffer
1744 * @val: the integer to be converted
1745 * @neg: sign of the number, %TRUE for negative
1747 * In case of success %0 is returned and @buf and @size are updated with
1748 * the amount of bytes written.
1750 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1754 char tmp[TMPBUFLEN], *p = tmp;
1756 sprintf(p, "%s%lu", neg ? "-" : "", val);
1760 if (copy_to_user(*buf, tmp, len))
1768 static int proc_put_char(void __user **buf, size_t *size, char c)
1771 char __user **buffer = (char __user **)buf;
1772 if (put_user(c, *buffer))
1774 (*size)--, (*buffer)++;
1780 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1782 int write, void *data)
1785 *valp = *negp ? -*lvalp : *lvalp;
1790 *lvalp = (unsigned long)-val;
1793 *lvalp = (unsigned long)val;
1799 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1801 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1802 int write, void __user *buffer,
1803 size_t *lenp, loff_t *ppos,
1804 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1805 int write, void *data),
1808 int *i, vleft, first = 1, err = 0;
1809 unsigned long page = 0;
1813 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1818 i = (int *) tbl_data;
1819 vleft = table->maxlen / sizeof(*i);
1823 conv = do_proc_dointvec_conv;
1826 if (left > PAGE_SIZE - 1)
1827 left = PAGE_SIZE - 1;
1828 page = __get_free_page(GFP_TEMPORARY);
1829 kbuf = (char *) page;
1832 if (copy_from_user(kbuf, buffer, left)) {
1839 for (; left && vleft--; i++, first=0) {
1844 left -= proc_skip_spaces(&kbuf);
1848 err = proc_get_long(&kbuf, &left, &lval, &neg,
1850 sizeof(proc_wspace_sep), NULL);
1853 if (conv(&neg, &lval, i, 1, data)) {
1858 if (conv(&neg, &lval, i, 0, data)) {
1863 err = proc_put_char(&buffer, &left, '\t');
1866 err = proc_put_long(&buffer, &left, lval, neg);
1872 if (!write && !first && left && !err)
1873 err = proc_put_char(&buffer, &left, '\n');
1874 if (write && !err && left)
1875 left -= proc_skip_spaces(&kbuf);
1880 return err ? : -EINVAL;
1887 static int do_proc_dointvec(struct ctl_table *table, int write,
1888 void __user *buffer, size_t *lenp, loff_t *ppos,
1889 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1890 int write, void *data),
1893 return __do_proc_dointvec(table->data, table, write,
1894 buffer, lenp, ppos, conv, data);
1898 * proc_dointvec - read a vector of integers
1899 * @table: the sysctl table
1900 * @write: %TRUE if this is a write to the sysctl file
1901 * @buffer: the user buffer
1902 * @lenp: the size of the user buffer
1903 * @ppos: file position
1905 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1906 * values from/to the user buffer, treated as an ASCII string.
1908 * Returns 0 on success.
1910 int proc_dointvec(struct ctl_table *table, int write,
1911 void __user *buffer, size_t *lenp, loff_t *ppos)
1913 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1918 * Taint values can only be increased
1919 * This means we can safely use a temporary.
1921 static int proc_taint(struct ctl_table *table, int write,
1922 void __user *buffer, size_t *lenp, loff_t *ppos)
1925 unsigned long tmptaint = get_taint();
1928 if (write && !capable(CAP_SYS_ADMIN))
1933 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1939 * Poor man's atomic or. Not worth adding a primitive
1940 * to everyone's atomic.h for this
1943 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1944 if ((tmptaint >> i) & 1)
1952 #ifdef CONFIG_PRINTK
1953 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1954 void __user *buffer, size_t *lenp, loff_t *ppos)
1956 if (write && !capable(CAP_SYS_ADMIN))
1959 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1963 struct do_proc_dointvec_minmax_conv_param {
1968 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1970 int write, void *data)
1972 struct do_proc_dointvec_minmax_conv_param *param = data;
1974 int val = *negp ? -*lvalp : *lvalp;
1975 if ((param->min && *param->min > val) ||
1976 (param->max && *param->max < val))
1983 *lvalp = (unsigned long)-val;
1986 *lvalp = (unsigned long)val;
1993 * proc_dointvec_minmax - read a vector of integers with min/max values
1994 * @table: the sysctl table
1995 * @write: %TRUE if this is a write to the sysctl file
1996 * @buffer: the user buffer
1997 * @lenp: the size of the user buffer
1998 * @ppos: file position
2000 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2001 * values from/to the user buffer, treated as an ASCII string.
2003 * This routine will ensure the values are within the range specified by
2004 * table->extra1 (min) and table->extra2 (max).
2006 * Returns 0 on success.
2008 int proc_dointvec_minmax(struct ctl_table *table, int write,
2009 void __user *buffer, size_t *lenp, loff_t *ppos)
2011 struct do_proc_dointvec_minmax_conv_param param = {
2012 .min = (int *) table->extra1,
2013 .max = (int *) table->extra2,
2015 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2016 do_proc_dointvec_minmax_conv, ¶m);
2019 static void validate_coredump_safety(void)
2021 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2022 core_pattern[0] != '/' && core_pattern[0] != '|') {
2023 printk(KERN_WARNING "Unsafe core_pattern used with "\
2024 "suid_dumpable=2. Pipe handler or fully qualified "\
2025 "core dump path required.\n");
2029 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2030 void __user *buffer, size_t *lenp, loff_t *ppos)
2032 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2034 validate_coredump_safety();
2038 static int proc_dostring_coredump(struct ctl_table *table, int write,
2039 void __user *buffer, size_t *lenp, loff_t *ppos)
2041 int error = proc_dostring(table, write, buffer, lenp, ppos);
2043 validate_coredump_safety();
2047 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2048 void __user *buffer,
2049 size_t *lenp, loff_t *ppos,
2050 unsigned long convmul,
2051 unsigned long convdiv)
2053 unsigned long *i, *min, *max;
2054 int vleft, first = 1, err = 0;
2055 unsigned long page = 0;
2059 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2064 i = (unsigned long *) data;
2065 min = (unsigned long *) table->extra1;
2066 max = (unsigned long *) table->extra2;
2067 vleft = table->maxlen / sizeof(unsigned long);
2071 if (left > PAGE_SIZE - 1)
2072 left = PAGE_SIZE - 1;
2073 page = __get_free_page(GFP_TEMPORARY);
2074 kbuf = (char *) page;
2077 if (copy_from_user(kbuf, buffer, left)) {
2084 for (; left && vleft--; i++, first = 0) {
2090 left -= proc_skip_spaces(&kbuf);
2092 err = proc_get_long(&kbuf, &left, &val, &neg,
2094 sizeof(proc_wspace_sep), NULL);
2099 if ((min && val < *min) || (max && val > *max))
2103 val = convdiv * (*i) / convmul;
2105 err = proc_put_char(&buffer, &left, '\t');
2106 err = proc_put_long(&buffer, &left, val, false);
2112 if (!write && !first && left && !err)
2113 err = proc_put_char(&buffer, &left, '\n');
2115 left -= proc_skip_spaces(&kbuf);
2120 return err ? : -EINVAL;
2127 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2128 void __user *buffer,
2129 size_t *lenp, loff_t *ppos,
2130 unsigned long convmul,
2131 unsigned long convdiv)
2133 return __do_proc_doulongvec_minmax(table->data, table, write,
2134 buffer, lenp, ppos, convmul, convdiv);
2138 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2139 * @table: the sysctl table
2140 * @write: %TRUE if this is a write to the sysctl file
2141 * @buffer: the user buffer
2142 * @lenp: the size of the user buffer
2143 * @ppos: file position
2145 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2146 * values from/to the user buffer, treated as an ASCII string.
2148 * This routine will ensure the values are within the range specified by
2149 * table->extra1 (min) and table->extra2 (max).
2151 * Returns 0 on success.
2153 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2154 void __user *buffer, size_t *lenp, loff_t *ppos)
2156 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2160 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2161 * @table: the sysctl table
2162 * @write: %TRUE if this is a write to the sysctl file
2163 * @buffer: the user buffer
2164 * @lenp: the size of the user buffer
2165 * @ppos: file position
2167 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2168 * values from/to the user buffer, treated as an ASCII string. The values
2169 * are treated as milliseconds, and converted to jiffies when they are stored.
2171 * This routine will ensure the values are within the range specified by
2172 * table->extra1 (min) and table->extra2 (max).
2174 * Returns 0 on success.
2176 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2177 void __user *buffer,
2178 size_t *lenp, loff_t *ppos)
2180 return do_proc_doulongvec_minmax(table, write, buffer,
2181 lenp, ppos, HZ, 1000l);
2185 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2187 int write, void *data)
2190 if (*lvalp > LONG_MAX / HZ)
2192 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2198 lval = (unsigned long)-val;
2201 lval = (unsigned long)val;
2208 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2210 int write, void *data)
2213 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2215 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2221 lval = (unsigned long)-val;
2224 lval = (unsigned long)val;
2226 *lvalp = jiffies_to_clock_t(lval);
2231 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2233 int write, void *data)
2236 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2242 lval = (unsigned long)-val;
2245 lval = (unsigned long)val;
2247 *lvalp = jiffies_to_msecs(lval);
2253 * proc_dointvec_jiffies - read a vector of integers as seconds
2254 * @table: the sysctl table
2255 * @write: %TRUE if this is a write to the sysctl file
2256 * @buffer: the user buffer
2257 * @lenp: the size of the user buffer
2258 * @ppos: file position
2260 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2261 * values from/to the user buffer, treated as an ASCII string.
2262 * The values read are assumed to be in seconds, and are converted into
2265 * Returns 0 on success.
2267 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2268 void __user *buffer, size_t *lenp, loff_t *ppos)
2270 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2271 do_proc_dointvec_jiffies_conv,NULL);
2275 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2276 * @table: the sysctl table
2277 * @write: %TRUE if this is a write to the sysctl file
2278 * @buffer: the user buffer
2279 * @lenp: the size of the user buffer
2280 * @ppos: pointer to the file position
2282 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2283 * values from/to the user buffer, treated as an ASCII string.
2284 * The values read are assumed to be in 1/USER_HZ seconds, and
2285 * are converted into jiffies.
2287 * Returns 0 on success.
2289 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2290 void __user *buffer, size_t *lenp, loff_t *ppos)
2292 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2293 do_proc_dointvec_userhz_jiffies_conv,NULL);
2297 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2298 * @table: the sysctl table
2299 * @write: %TRUE if this is a write to the sysctl file
2300 * @buffer: the user buffer
2301 * @lenp: the size of the user buffer
2302 * @ppos: file position
2303 * @ppos: the current position in the file
2305 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2306 * values from/to the user buffer, treated as an ASCII string.
2307 * The values read are assumed to be in 1/1000 seconds, and
2308 * are converted into jiffies.
2310 * Returns 0 on success.
2312 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2313 void __user *buffer, size_t *lenp, loff_t *ppos)
2315 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2316 do_proc_dointvec_ms_jiffies_conv, NULL);
2319 static int proc_do_cad_pid(struct ctl_table *table, int write,
2320 void __user *buffer, size_t *lenp, loff_t *ppos)
2322 struct pid *new_pid;
2326 tmp = pid_vnr(cad_pid);
2328 r = __do_proc_dointvec(&tmp, table, write, buffer,
2329 lenp, ppos, NULL, NULL);
2333 new_pid = find_get_pid(tmp);
2337 put_pid(xchg(&cad_pid, new_pid));
2342 * proc_do_large_bitmap - read/write from/to a large bitmap
2343 * @table: the sysctl table
2344 * @write: %TRUE if this is a write to the sysctl file
2345 * @buffer: the user buffer
2346 * @lenp: the size of the user buffer
2347 * @ppos: file position
2349 * The bitmap is stored at table->data and the bitmap length (in bits)
2352 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2353 * large bitmaps may be represented in a compact manner. Writing into
2354 * the file will clear the bitmap then update it with the given input.
2356 * Returns 0 on success.
2358 int proc_do_large_bitmap(struct ctl_table *table, int write,
2359 void __user *buffer, size_t *lenp, loff_t *ppos)
2363 size_t left = *lenp;
2364 unsigned long bitmap_len = table->maxlen;
2365 unsigned long *bitmap = (unsigned long *) table->data;
2366 unsigned long *tmp_bitmap = NULL;
2367 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2369 if (!bitmap_len || !left || (*ppos && !write)) {
2375 unsigned long page = 0;
2378 if (left > PAGE_SIZE - 1)
2379 left = PAGE_SIZE - 1;
2381 page = __get_free_page(GFP_TEMPORARY);
2382 kbuf = (char *) page;
2385 if (copy_from_user(kbuf, buffer, left)) {
2391 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2397 proc_skip_char(&kbuf, &left, '\n');
2398 while (!err && left) {
2399 unsigned long val_a, val_b;
2402 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2406 if (val_a >= bitmap_len || neg) {
2418 err = proc_get_long(&kbuf, &left, &val_b,
2419 &neg, tr_b, sizeof(tr_b),
2423 if (val_b >= bitmap_len || neg ||
2434 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2436 proc_skip_char(&kbuf, &left, '\n');
2440 unsigned long bit_a, bit_b = 0;
2443 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2444 if (bit_a >= bitmap_len)
2446 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2450 err = proc_put_char(&buffer, &left, ',');
2454 err = proc_put_long(&buffer, &left, bit_a, false);
2457 if (bit_a != bit_b) {
2458 err = proc_put_char(&buffer, &left, '-');
2461 err = proc_put_long(&buffer, &left, bit_b, false);
2469 err = proc_put_char(&buffer, &left, '\n');
2475 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2477 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2489 #else /* CONFIG_PROC_SYSCTL */
2491 int proc_dostring(struct ctl_table *table, int write,
2492 void __user *buffer, size_t *lenp, loff_t *ppos)
2497 int proc_dointvec(struct ctl_table *table, int write,
2498 void __user *buffer, size_t *lenp, loff_t *ppos)
2503 int proc_dointvec_minmax(struct ctl_table *table, int write,
2504 void __user *buffer, size_t *lenp, loff_t *ppos)
2509 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2515 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2516 void __user *buffer, size_t *lenp, loff_t *ppos)
2521 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2522 void __user *buffer, size_t *lenp, loff_t *ppos)
2527 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos)
2533 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2534 void __user *buffer,
2535 size_t *lenp, loff_t *ppos)
2541 #endif /* CONFIG_PROC_SYSCTL */
2544 * No sense putting this after each symbol definition, twice,
2545 * exception granted :-)
2547 EXPORT_SYMBOL(proc_dointvec);
2548 EXPORT_SYMBOL(proc_dointvec_jiffies);
2549 EXPORT_SYMBOL(proc_dointvec_minmax);
2550 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2551 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2552 EXPORT_SYMBOL(proc_dostring);
2553 EXPORT_SYMBOL(proc_doulongvec_minmax);
2554 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);