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>
34 #include <linux/init.h>
35 #include <linux/kernel.h>
36 #include <linux/kobject.h>
37 #include <linux/net.h>
38 #include <linux/sysrq.h>
39 #include <linux/highuid.h>
40 #include <linux/writeback.h>
41 #include <linux/ratelimit.h>
42 #include <linux/compaction.h>
43 #include <linux/hugetlb.h>
44 #include <linux/initrd.h>
45 #include <linux/key.h>
46 #include <linux/times.h>
47 #include <linux/limits.h>
48 #include <linux/dcache.h>
49 #include <linux/dnotify.h>
50 #include <linux/syscalls.h>
51 #include <linux/vmstat.h>
52 #include <linux/nfs_fs.h>
53 #include <linux/acpi.h>
54 #include <linux/reboot.h>
55 #include <linux/ftrace.h>
56 #include <linux/perf_event.h>
57 #include <linux/kprobes.h>
58 #include <linux/pipe_fs_i.h>
59 #include <linux/oom.h>
60 #include <linux/kmod.h>
61 #include <linux/capability.h>
62 #include <linux/binfmts.h>
64 #include <asm/uaccess.h>
65 #include <asm/processor.h>
69 #include <asm/stacktrace.h>
72 #ifdef CONFIG_BSD_PROCESS_ACCT
73 #include <linux/acct.h>
75 #ifdef CONFIG_RT_MUTEXES
76 #include <linux/rtmutex.h>
78 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
79 #include <linux/lockdep.h>
81 #ifdef CONFIG_CHR_DEV_SG
85 #ifdef CONFIG_LOCKUP_DETECTOR
86 #include <linux/nmi.h>
90 #if defined(CONFIG_SYSCTL)
92 /* External variables not in a header file. */
93 extern int sysctl_overcommit_memory;
94 extern int sysctl_overcommit_ratio;
95 extern int max_threads;
96 extern int core_uses_pid;
97 extern int suid_dumpable;
98 extern char core_pattern[];
99 extern unsigned int core_pipe_limit;
101 extern int min_free_kbytes;
102 extern int pid_max_min, pid_max_max;
103 extern int sysctl_drop_caches;
104 extern int percpu_pagelist_fraction;
105 extern int compat_log;
106 extern int latencytop_enabled;
107 extern int sysctl_nr_open_min, sysctl_nr_open_max;
109 extern int sysctl_nr_trim_pages;
112 extern int blk_iopoll_enabled;
115 /* Constants used for minimum and maximum */
116 #ifdef CONFIG_LOCKUP_DETECTOR
117 static int sixty = 60;
118 static int neg_one = -1;
122 static int __maybe_unused one = 1;
123 static int __maybe_unused two = 2;
124 static int __maybe_unused three = 3;
125 static unsigned long one_ul = 1;
126 static int one_hundred = 100;
128 static int ten_thousand = 10000;
131 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
132 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
134 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
135 static int maxolduid = 65535;
136 static int minolduid;
137 static int min_percpu_pagelist_fract = 8;
139 static int ngroups_max = NGROUPS_MAX;
140 static const int cap_last_cap = CAP_LAST_CAP;
142 #ifdef CONFIG_INOTIFY_USER
143 #include <linux/inotify.h>
146 #include <asm/system.h>
149 #ifdef CONFIG_SPARC64
150 extern int sysctl_tsb_ratio;
154 extern int pwrsw_enabled;
155 extern int unaligned_enabled;
159 extern int no_unaligned_warning;
160 extern int unaligned_dump_stack;
163 #ifdef CONFIG_PROC_SYSCTL
164 static int proc_do_cad_pid(struct ctl_table *table, int write,
165 void __user *buffer, size_t *lenp, loff_t *ppos);
166 static int proc_taint(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
171 static int proc_dmesg_restrict(struct ctl_table *table, int write,
172 void __user *buffer, size_t *lenp, loff_t *ppos);
175 #ifdef CONFIG_MAGIC_SYSRQ
176 /* Note: sysrq code uses it's own private copy */
177 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
179 static int sysrq_sysctl_handler(ctl_table *table, int write,
180 void __user *buffer, size_t *lenp,
185 error = proc_dointvec(table, write, buffer, lenp, ppos);
190 sysrq_toggle_support(__sysrq_enabled);
197 static struct ctl_table kern_table[];
198 static struct ctl_table vm_table[];
199 static struct ctl_table fs_table[];
200 static struct ctl_table debug_table[];
201 static struct ctl_table dev_table[];
202 extern struct ctl_table random_table[];
204 extern struct ctl_table epoll_table[];
207 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
208 int sysctl_legacy_va_layout;
211 /* The default sysctl tables: */
213 static struct ctl_table sysctl_base_table[] = {
215 .procname = "kernel",
232 .child = debug_table,
242 #ifdef CONFIG_SCHED_DEBUG
243 static int min_sched_granularity_ns = 100000; /* 100 usecs */
244 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
245 static int min_wakeup_granularity_ns; /* 0 usecs */
246 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
247 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
248 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
251 #ifdef CONFIG_COMPACTION
252 static int min_extfrag_threshold;
253 static int max_extfrag_threshold = 1000;
256 static struct ctl_table kern_table[] = {
258 .procname = "sched_child_runs_first",
259 .data = &sysctl_sched_child_runs_first,
260 .maxlen = sizeof(unsigned int),
262 .proc_handler = proc_dointvec,
264 #ifdef CONFIG_SCHED_DEBUG
266 .procname = "sched_min_granularity_ns",
267 .data = &sysctl_sched_min_granularity,
268 .maxlen = sizeof(unsigned int),
270 .proc_handler = sched_proc_update_handler,
271 .extra1 = &min_sched_granularity_ns,
272 .extra2 = &max_sched_granularity_ns,
275 .procname = "sched_latency_ns",
276 .data = &sysctl_sched_latency,
277 .maxlen = sizeof(unsigned int),
279 .proc_handler = sched_proc_update_handler,
280 .extra1 = &min_sched_granularity_ns,
281 .extra2 = &max_sched_granularity_ns,
284 .procname = "sched_wakeup_granularity_ns",
285 .data = &sysctl_sched_wakeup_granularity,
286 .maxlen = sizeof(unsigned int),
288 .proc_handler = sched_proc_update_handler,
289 .extra1 = &min_wakeup_granularity_ns,
290 .extra2 = &max_wakeup_granularity_ns,
293 .procname = "sched_tunable_scaling",
294 .data = &sysctl_sched_tunable_scaling,
295 .maxlen = sizeof(enum sched_tunable_scaling),
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_sched_tunable_scaling,
299 .extra2 = &max_sched_tunable_scaling,
302 .procname = "sched_migration_cost",
303 .data = &sysctl_sched_migration_cost,
304 .maxlen = sizeof(unsigned int),
306 .proc_handler = proc_dointvec,
309 .procname = "sched_nr_migrate",
310 .data = &sysctl_sched_nr_migrate,
311 .maxlen = sizeof(unsigned int),
313 .proc_handler = proc_dointvec,
316 .procname = "sched_time_avg",
317 .data = &sysctl_sched_time_avg,
318 .maxlen = sizeof(unsigned int),
320 .proc_handler = proc_dointvec,
323 .procname = "sched_shares_window",
324 .data = &sysctl_sched_shares_window,
325 .maxlen = sizeof(unsigned int),
327 .proc_handler = proc_dointvec,
330 .procname = "timer_migration",
331 .data = &sysctl_timer_migration,
332 .maxlen = sizeof(unsigned int),
334 .proc_handler = proc_dointvec_minmax,
340 .procname = "sched_rt_period_us",
341 .data = &sysctl_sched_rt_period,
342 .maxlen = sizeof(unsigned int),
344 .proc_handler = sched_rt_handler,
347 .procname = "sched_rt_runtime_us",
348 .data = &sysctl_sched_rt_runtime,
349 .maxlen = sizeof(int),
351 .proc_handler = sched_rt_handler,
353 #ifdef CONFIG_SCHED_AUTOGROUP
355 .procname = "sched_autogroup_enabled",
356 .data = &sysctl_sched_autogroup_enabled,
357 .maxlen = sizeof(unsigned int),
359 .proc_handler = proc_dointvec_minmax,
364 #ifdef CONFIG_CFS_BANDWIDTH
366 .procname = "sched_cfs_bandwidth_slice_us",
367 .data = &sysctl_sched_cfs_bandwidth_slice,
368 .maxlen = sizeof(unsigned int),
370 .proc_handler = proc_dointvec_minmax,
374 #ifdef CONFIG_PROVE_LOCKING
376 .procname = "prove_locking",
377 .data = &prove_locking,
378 .maxlen = sizeof(int),
380 .proc_handler = proc_dointvec,
383 #ifdef CONFIG_LOCK_STAT
385 .procname = "lock_stat",
387 .maxlen = sizeof(int),
389 .proc_handler = proc_dointvec,
394 .data = &panic_timeout,
395 .maxlen = sizeof(int),
397 .proc_handler = proc_dointvec,
400 .procname = "core_uses_pid",
401 .data = &core_uses_pid,
402 .maxlen = sizeof(int),
404 .proc_handler = proc_dointvec,
407 .procname = "core_pattern",
408 .data = core_pattern,
409 .maxlen = CORENAME_MAX_SIZE,
411 .proc_handler = proc_dostring,
414 .procname = "core_pipe_limit",
415 .data = &core_pipe_limit,
416 .maxlen = sizeof(unsigned int),
418 .proc_handler = proc_dointvec,
420 #ifdef CONFIG_PROC_SYSCTL
422 .procname = "tainted",
423 .maxlen = sizeof(long),
425 .proc_handler = proc_taint,
428 #ifdef CONFIG_LATENCYTOP
430 .procname = "latencytop",
431 .data = &latencytop_enabled,
432 .maxlen = sizeof(int),
434 .proc_handler = proc_dointvec,
437 #ifdef CONFIG_BLK_DEV_INITRD
439 .procname = "real-root-dev",
440 .data = &real_root_dev,
441 .maxlen = sizeof(int),
443 .proc_handler = proc_dointvec,
447 .procname = "print-fatal-signals",
448 .data = &print_fatal_signals,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec,
455 .procname = "reboot-cmd",
456 .data = reboot_command,
459 .proc_handler = proc_dostring,
462 .procname = "stop-a",
463 .data = &stop_a_enabled,
464 .maxlen = sizeof (int),
466 .proc_handler = proc_dointvec,
469 .procname = "scons-poweroff",
470 .data = &scons_pwroff,
471 .maxlen = sizeof (int),
473 .proc_handler = proc_dointvec,
476 #ifdef CONFIG_SPARC64
478 .procname = "tsb-ratio",
479 .data = &sysctl_tsb_ratio,
480 .maxlen = sizeof (int),
482 .proc_handler = proc_dointvec,
487 .procname = "soft-power",
488 .data = &pwrsw_enabled,
489 .maxlen = sizeof (int),
491 .proc_handler = proc_dointvec,
494 .procname = "unaligned-trap",
495 .data = &unaligned_enabled,
496 .maxlen = sizeof (int),
498 .proc_handler = proc_dointvec,
502 .procname = "ctrl-alt-del",
504 .maxlen = sizeof(int),
506 .proc_handler = proc_dointvec,
508 #ifdef CONFIG_FUNCTION_TRACER
510 .procname = "ftrace_enabled",
511 .data = &ftrace_enabled,
512 .maxlen = sizeof(int),
514 .proc_handler = ftrace_enable_sysctl,
517 #ifdef CONFIG_STACK_TRACER
519 .procname = "stack_tracer_enabled",
520 .data = &stack_tracer_enabled,
521 .maxlen = sizeof(int),
523 .proc_handler = stack_trace_sysctl,
526 #ifdef CONFIG_TRACING
528 .procname = "ftrace_dump_on_oops",
529 .data = &ftrace_dump_on_oops,
530 .maxlen = sizeof(int),
532 .proc_handler = proc_dointvec,
535 #ifdef CONFIG_MODULES
537 .procname = "modprobe",
538 .data = &modprobe_path,
539 .maxlen = KMOD_PATH_LEN,
541 .proc_handler = proc_dostring,
544 .procname = "modules_disabled",
545 .data = &modules_disabled,
546 .maxlen = sizeof(int),
548 /* only handle a transition from default "0" to "1" */
549 .proc_handler = proc_dointvec_minmax,
554 #ifdef CONFIG_HOTPLUG
556 .procname = "hotplug",
557 .data = &uevent_helper,
558 .maxlen = UEVENT_HELPER_PATH_LEN,
560 .proc_handler = proc_dostring,
563 #ifdef CONFIG_CHR_DEV_SG
565 .procname = "sg-big-buff",
566 .data = &sg_big_buff,
567 .maxlen = sizeof (int),
569 .proc_handler = proc_dointvec,
572 #ifdef CONFIG_BSD_PROCESS_ACCT
576 .maxlen = 3*sizeof(int),
578 .proc_handler = proc_dointvec,
581 #ifdef CONFIG_MAGIC_SYSRQ
584 .data = &__sysrq_enabled,
585 .maxlen = sizeof (int),
587 .proc_handler = sysrq_sysctl_handler,
590 #ifdef CONFIG_PROC_SYSCTL
592 .procname = "cad_pid",
594 .maxlen = sizeof (int),
596 .proc_handler = proc_do_cad_pid,
600 .procname = "threads-max",
601 .data = &max_threads,
602 .maxlen = sizeof(int),
604 .proc_handler = proc_dointvec,
607 .procname = "random",
609 .child = random_table,
612 .procname = "usermodehelper",
614 .child = usermodehelper_table,
617 .procname = "overflowuid",
618 .data = &overflowuid,
619 .maxlen = sizeof(int),
621 .proc_handler = proc_dointvec_minmax,
622 .extra1 = &minolduid,
623 .extra2 = &maxolduid,
626 .procname = "overflowgid",
627 .data = &overflowgid,
628 .maxlen = sizeof(int),
630 .proc_handler = proc_dointvec_minmax,
631 .extra1 = &minolduid,
632 .extra2 = &maxolduid,
635 #ifdef CONFIG_MATHEMU
637 .procname = "ieee_emulation_warnings",
638 .data = &sysctl_ieee_emulation_warnings,
639 .maxlen = sizeof(int),
641 .proc_handler = proc_dointvec,
645 .procname = "userprocess_debug",
646 .data = &show_unhandled_signals,
647 .maxlen = sizeof(int),
649 .proc_handler = proc_dointvec,
653 .procname = "pid_max",
655 .maxlen = sizeof (int),
657 .proc_handler = proc_dointvec_minmax,
658 .extra1 = &pid_max_min,
659 .extra2 = &pid_max_max,
662 .procname = "panic_on_oops",
663 .data = &panic_on_oops,
664 .maxlen = sizeof(int),
666 .proc_handler = proc_dointvec,
668 #if defined CONFIG_PRINTK
670 .procname = "printk",
671 .data = &console_loglevel,
672 .maxlen = 4*sizeof(int),
674 .proc_handler = proc_dointvec,
677 .procname = "printk_ratelimit",
678 .data = &printk_ratelimit_state.interval,
679 .maxlen = sizeof(int),
681 .proc_handler = proc_dointvec_jiffies,
684 .procname = "printk_ratelimit_burst",
685 .data = &printk_ratelimit_state.burst,
686 .maxlen = sizeof(int),
688 .proc_handler = proc_dointvec,
691 .procname = "printk_delay",
692 .data = &printk_delay_msec,
693 .maxlen = sizeof(int),
695 .proc_handler = proc_dointvec_minmax,
697 .extra2 = &ten_thousand,
700 .procname = "dmesg_restrict",
701 .data = &dmesg_restrict,
702 .maxlen = sizeof(int),
704 .proc_handler = proc_dointvec_minmax,
709 .procname = "kptr_restrict",
710 .data = &kptr_restrict,
711 .maxlen = sizeof(int),
713 .proc_handler = proc_dmesg_restrict,
719 .procname = "ngroups_max",
720 .data = &ngroups_max,
721 .maxlen = sizeof (int),
723 .proc_handler = proc_dointvec,
726 .procname = "cap_last_cap",
727 .data = (void *)&cap_last_cap,
728 .maxlen = sizeof(int),
730 .proc_handler = proc_dointvec,
732 #if defined(CONFIG_LOCKUP_DETECTOR)
734 .procname = "watchdog",
735 .data = &watchdog_enabled,
736 .maxlen = sizeof (int),
738 .proc_handler = proc_dowatchdog,
743 .procname = "watchdog_thresh",
744 .data = &watchdog_thresh,
745 .maxlen = sizeof(int),
747 .proc_handler = proc_dowatchdog,
752 .procname = "softlockup_panic",
753 .data = &softlockup_panic,
754 .maxlen = sizeof(int),
756 .proc_handler = proc_dointvec_minmax,
761 .procname = "nmi_watchdog",
762 .data = &watchdog_enabled,
763 .maxlen = sizeof (int),
765 .proc_handler = proc_dowatchdog,
770 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
772 .procname = "unknown_nmi_panic",
773 .data = &unknown_nmi_panic,
774 .maxlen = sizeof (int),
776 .proc_handler = proc_dointvec,
779 #if defined(CONFIG_X86)
781 .procname = "panic_on_unrecovered_nmi",
782 .data = &panic_on_unrecovered_nmi,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec,
788 .procname = "panic_on_io_nmi",
789 .data = &panic_on_io_nmi,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec,
794 #ifdef CONFIG_DEBUG_STACKOVERFLOW
796 .procname = "panic_on_stackoverflow",
797 .data = &sysctl_panic_on_stackoverflow,
798 .maxlen = sizeof(int),
800 .proc_handler = proc_dointvec,
804 .procname = "bootloader_type",
805 .data = &bootloader_type,
806 .maxlen = sizeof (int),
808 .proc_handler = proc_dointvec,
811 .procname = "bootloader_version",
812 .data = &bootloader_version,
813 .maxlen = sizeof (int),
815 .proc_handler = proc_dointvec,
818 .procname = "kstack_depth_to_print",
819 .data = &kstack_depth_to_print,
820 .maxlen = sizeof(int),
822 .proc_handler = proc_dointvec,
825 .procname = "io_delay_type",
826 .data = &io_delay_type,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dointvec,
832 #if defined(CONFIG_MMU)
834 .procname = "randomize_va_space",
835 .data = &randomize_va_space,
836 .maxlen = sizeof(int),
838 .proc_handler = proc_dointvec,
841 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
843 .procname = "spin_retry",
845 .maxlen = sizeof (int),
847 .proc_handler = proc_dointvec,
850 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
852 .procname = "acpi_video_flags",
853 .data = &acpi_realmode_flags,
854 .maxlen = sizeof (unsigned long),
856 .proc_handler = proc_doulongvec_minmax,
861 .procname = "ignore-unaligned-usertrap",
862 .data = &no_unaligned_warning,
863 .maxlen = sizeof (int),
865 .proc_handler = proc_dointvec,
868 .procname = "unaligned-dump-stack",
869 .data = &unaligned_dump_stack,
870 .maxlen = sizeof (int),
872 .proc_handler = proc_dointvec,
875 #ifdef CONFIG_DETECT_HUNG_TASK
877 .procname = "hung_task_panic",
878 .data = &sysctl_hung_task_panic,
879 .maxlen = sizeof(int),
881 .proc_handler = proc_dointvec_minmax,
886 .procname = "hung_task_check_count",
887 .data = &sysctl_hung_task_check_count,
888 .maxlen = sizeof(unsigned long),
890 .proc_handler = proc_doulongvec_minmax,
893 .procname = "hung_task_timeout_secs",
894 .data = &sysctl_hung_task_timeout_secs,
895 .maxlen = sizeof(unsigned long),
897 .proc_handler = proc_dohung_task_timeout_secs,
900 .procname = "hung_task_warnings",
901 .data = &sysctl_hung_task_warnings,
902 .maxlen = sizeof(unsigned long),
904 .proc_handler = proc_doulongvec_minmax,
909 .procname = "compat-log",
911 .maxlen = sizeof (int),
913 .proc_handler = proc_dointvec,
916 #ifdef CONFIG_RT_MUTEXES
918 .procname = "max_lock_depth",
919 .data = &max_lock_depth,
920 .maxlen = sizeof(int),
922 .proc_handler = proc_dointvec,
926 .procname = "poweroff_cmd",
927 .data = &poweroff_cmd,
928 .maxlen = POWEROFF_CMD_PATH_LEN,
930 .proc_handler = proc_dostring,
936 .child = key_sysctls,
939 #ifdef CONFIG_RCU_TORTURE_TEST
941 .procname = "rcutorture_runnable",
942 .data = &rcutorture_runnable,
943 .maxlen = sizeof(int),
945 .proc_handler = proc_dointvec,
948 #ifdef CONFIG_PERF_EVENTS
950 * User-space scripts rely on the existence of this file
951 * as a feature check for perf_events being enabled.
953 * So it's an ABI, do not remove!
956 .procname = "perf_event_paranoid",
957 .data = &sysctl_perf_event_paranoid,
958 .maxlen = sizeof(sysctl_perf_event_paranoid),
960 .proc_handler = proc_dointvec,
963 .procname = "perf_event_mlock_kb",
964 .data = &sysctl_perf_event_mlock,
965 .maxlen = sizeof(sysctl_perf_event_mlock),
967 .proc_handler = proc_dointvec,
970 .procname = "perf_event_max_sample_rate",
971 .data = &sysctl_perf_event_sample_rate,
972 .maxlen = sizeof(sysctl_perf_event_sample_rate),
974 .proc_handler = perf_proc_update_handler,
977 #ifdef CONFIG_KMEMCHECK
979 .procname = "kmemcheck",
980 .data = &kmemcheck_enabled,
981 .maxlen = sizeof(int),
983 .proc_handler = proc_dointvec,
988 .procname = "blk_iopoll",
989 .data = &blk_iopoll_enabled,
990 .maxlen = sizeof(int),
992 .proc_handler = proc_dointvec,
998 static struct ctl_table vm_table[] = {
1000 .procname = "overcommit_memory",
1001 .data = &sysctl_overcommit_memory,
1002 .maxlen = sizeof(sysctl_overcommit_memory),
1004 .proc_handler = proc_dointvec_minmax,
1009 .procname = "panic_on_oom",
1010 .data = &sysctl_panic_on_oom,
1011 .maxlen = sizeof(sysctl_panic_on_oom),
1013 .proc_handler = proc_dointvec_minmax,
1018 .procname = "oom_kill_allocating_task",
1019 .data = &sysctl_oom_kill_allocating_task,
1020 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1022 .proc_handler = proc_dointvec,
1025 .procname = "oom_dump_tasks",
1026 .data = &sysctl_oom_dump_tasks,
1027 .maxlen = sizeof(sysctl_oom_dump_tasks),
1029 .proc_handler = proc_dointvec,
1032 .procname = "overcommit_ratio",
1033 .data = &sysctl_overcommit_ratio,
1034 .maxlen = sizeof(sysctl_overcommit_ratio),
1036 .proc_handler = proc_dointvec,
1039 .procname = "page-cluster",
1040 .data = &page_cluster,
1041 .maxlen = sizeof(int),
1043 .proc_handler = proc_dointvec_minmax,
1047 .procname = "dirty_background_ratio",
1048 .data = &dirty_background_ratio,
1049 .maxlen = sizeof(dirty_background_ratio),
1051 .proc_handler = dirty_background_ratio_handler,
1053 .extra2 = &one_hundred,
1056 .procname = "dirty_background_bytes",
1057 .data = &dirty_background_bytes,
1058 .maxlen = sizeof(dirty_background_bytes),
1060 .proc_handler = dirty_background_bytes_handler,
1064 .procname = "dirty_ratio",
1065 .data = &vm_dirty_ratio,
1066 .maxlen = sizeof(vm_dirty_ratio),
1068 .proc_handler = dirty_ratio_handler,
1070 .extra2 = &one_hundred,
1073 .procname = "dirty_bytes",
1074 .data = &vm_dirty_bytes,
1075 .maxlen = sizeof(vm_dirty_bytes),
1077 .proc_handler = dirty_bytes_handler,
1078 .extra1 = &dirty_bytes_min,
1081 .procname = "dirty_writeback_centisecs",
1082 .data = &dirty_writeback_interval,
1083 .maxlen = sizeof(dirty_writeback_interval),
1085 .proc_handler = dirty_writeback_centisecs_handler,
1088 .procname = "dirty_expire_centisecs",
1089 .data = &dirty_expire_interval,
1090 .maxlen = sizeof(dirty_expire_interval),
1092 .proc_handler = proc_dointvec_minmax,
1096 .procname = "nr_pdflush_threads",
1097 .data = &nr_pdflush_threads,
1098 .maxlen = sizeof nr_pdflush_threads,
1099 .mode = 0444 /* read-only*/,
1100 .proc_handler = proc_dointvec,
1103 .procname = "swappiness",
1104 .data = &vm_swappiness,
1105 .maxlen = sizeof(vm_swappiness),
1107 .proc_handler = proc_dointvec_minmax,
1109 .extra2 = &one_hundred,
1111 #ifdef CONFIG_HUGETLB_PAGE
1113 .procname = "nr_hugepages",
1115 .maxlen = sizeof(unsigned long),
1117 .proc_handler = hugetlb_sysctl_handler,
1118 .extra1 = (void *)&hugetlb_zero,
1119 .extra2 = (void *)&hugetlb_infinity,
1123 .procname = "nr_hugepages_mempolicy",
1125 .maxlen = sizeof(unsigned long),
1127 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1128 .extra1 = (void *)&hugetlb_zero,
1129 .extra2 = (void *)&hugetlb_infinity,
1133 .procname = "hugetlb_shm_group",
1134 .data = &sysctl_hugetlb_shm_group,
1135 .maxlen = sizeof(gid_t),
1137 .proc_handler = proc_dointvec,
1140 .procname = "hugepages_treat_as_movable",
1141 .data = &hugepages_treat_as_movable,
1142 .maxlen = sizeof(int),
1144 .proc_handler = hugetlb_treat_movable_handler,
1147 .procname = "nr_overcommit_hugepages",
1149 .maxlen = sizeof(unsigned long),
1151 .proc_handler = hugetlb_overcommit_handler,
1152 .extra1 = (void *)&hugetlb_zero,
1153 .extra2 = (void *)&hugetlb_infinity,
1157 .procname = "lowmem_reserve_ratio",
1158 .data = &sysctl_lowmem_reserve_ratio,
1159 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1161 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1164 .procname = "drop_caches",
1165 .data = &sysctl_drop_caches,
1166 .maxlen = sizeof(int),
1168 .proc_handler = drop_caches_sysctl_handler,
1172 #ifdef CONFIG_COMPACTION
1174 .procname = "compact_memory",
1175 .data = &sysctl_compact_memory,
1176 .maxlen = sizeof(int),
1178 .proc_handler = sysctl_compaction_handler,
1181 .procname = "extfrag_threshold",
1182 .data = &sysctl_extfrag_threshold,
1183 .maxlen = sizeof(int),
1185 .proc_handler = sysctl_extfrag_handler,
1186 .extra1 = &min_extfrag_threshold,
1187 .extra2 = &max_extfrag_threshold,
1190 #endif /* CONFIG_COMPACTION */
1192 .procname = "min_free_kbytes",
1193 .data = &min_free_kbytes,
1194 .maxlen = sizeof(min_free_kbytes),
1196 .proc_handler = min_free_kbytes_sysctl_handler,
1200 .procname = "percpu_pagelist_fraction",
1201 .data = &percpu_pagelist_fraction,
1202 .maxlen = sizeof(percpu_pagelist_fraction),
1204 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1205 .extra1 = &min_percpu_pagelist_fract,
1209 .procname = "max_map_count",
1210 .data = &sysctl_max_map_count,
1211 .maxlen = sizeof(sysctl_max_map_count),
1213 .proc_handler = proc_dointvec_minmax,
1218 .procname = "nr_trim_pages",
1219 .data = &sysctl_nr_trim_pages,
1220 .maxlen = sizeof(sysctl_nr_trim_pages),
1222 .proc_handler = proc_dointvec_minmax,
1227 .procname = "laptop_mode",
1228 .data = &laptop_mode,
1229 .maxlen = sizeof(laptop_mode),
1231 .proc_handler = proc_dointvec_jiffies,
1234 .procname = "block_dump",
1235 .data = &block_dump,
1236 .maxlen = sizeof(block_dump),
1238 .proc_handler = proc_dointvec,
1242 .procname = "vfs_cache_pressure",
1243 .data = &sysctl_vfs_cache_pressure,
1244 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1246 .proc_handler = proc_dointvec,
1249 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1251 .procname = "legacy_va_layout",
1252 .data = &sysctl_legacy_va_layout,
1253 .maxlen = sizeof(sysctl_legacy_va_layout),
1255 .proc_handler = proc_dointvec,
1261 .procname = "zone_reclaim_mode",
1262 .data = &zone_reclaim_mode,
1263 .maxlen = sizeof(zone_reclaim_mode),
1265 .proc_handler = proc_dointvec,
1269 .procname = "min_unmapped_ratio",
1270 .data = &sysctl_min_unmapped_ratio,
1271 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1273 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1275 .extra2 = &one_hundred,
1278 .procname = "min_slab_ratio",
1279 .data = &sysctl_min_slab_ratio,
1280 .maxlen = sizeof(sysctl_min_slab_ratio),
1282 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1284 .extra2 = &one_hundred,
1289 .procname = "stat_interval",
1290 .data = &sysctl_stat_interval,
1291 .maxlen = sizeof(sysctl_stat_interval),
1293 .proc_handler = proc_dointvec_jiffies,
1298 .procname = "mmap_min_addr",
1299 .data = &dac_mmap_min_addr,
1300 .maxlen = sizeof(unsigned long),
1302 .proc_handler = mmap_min_addr_handler,
1307 .procname = "numa_zonelist_order",
1308 .data = &numa_zonelist_order,
1309 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1311 .proc_handler = numa_zonelist_order_handler,
1314 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1315 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1317 .procname = "vdso_enabled",
1318 .data = &vdso_enabled,
1319 .maxlen = sizeof(vdso_enabled),
1321 .proc_handler = proc_dointvec,
1325 #ifdef CONFIG_HIGHMEM
1327 .procname = "highmem_is_dirtyable",
1328 .data = &vm_highmem_is_dirtyable,
1329 .maxlen = sizeof(vm_highmem_is_dirtyable),
1331 .proc_handler = proc_dointvec_minmax,
1337 .procname = "scan_unevictable_pages",
1338 .data = &scan_unevictable_pages,
1339 .maxlen = sizeof(scan_unevictable_pages),
1341 .proc_handler = scan_unevictable_handler,
1343 #ifdef CONFIG_MEMORY_FAILURE
1345 .procname = "memory_failure_early_kill",
1346 .data = &sysctl_memory_failure_early_kill,
1347 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1349 .proc_handler = proc_dointvec_minmax,
1354 .procname = "memory_failure_recovery",
1355 .data = &sysctl_memory_failure_recovery,
1356 .maxlen = sizeof(sysctl_memory_failure_recovery),
1358 .proc_handler = proc_dointvec_minmax,
1366 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1367 static struct ctl_table binfmt_misc_table[] = {
1372 static struct ctl_table fs_table[] = {
1374 .procname = "inode-nr",
1375 .data = &inodes_stat,
1376 .maxlen = 2*sizeof(int),
1378 .proc_handler = proc_nr_inodes,
1381 .procname = "inode-state",
1382 .data = &inodes_stat,
1383 .maxlen = 7*sizeof(int),
1385 .proc_handler = proc_nr_inodes,
1388 .procname = "file-nr",
1389 .data = &files_stat,
1390 .maxlen = sizeof(files_stat),
1392 .proc_handler = proc_nr_files,
1395 .procname = "file-max",
1396 .data = &files_stat.max_files,
1397 .maxlen = sizeof(files_stat.max_files),
1399 .proc_handler = proc_doulongvec_minmax,
1402 .procname = "nr_open",
1403 .data = &sysctl_nr_open,
1404 .maxlen = sizeof(int),
1406 .proc_handler = proc_dointvec_minmax,
1407 .extra1 = &sysctl_nr_open_min,
1408 .extra2 = &sysctl_nr_open_max,
1411 .procname = "dentry-state",
1412 .data = &dentry_stat,
1413 .maxlen = 6*sizeof(int),
1415 .proc_handler = proc_nr_dentry,
1418 .procname = "overflowuid",
1419 .data = &fs_overflowuid,
1420 .maxlen = sizeof(int),
1422 .proc_handler = proc_dointvec_minmax,
1423 .extra1 = &minolduid,
1424 .extra2 = &maxolduid,
1427 .procname = "overflowgid",
1428 .data = &fs_overflowgid,
1429 .maxlen = sizeof(int),
1431 .proc_handler = proc_dointvec_minmax,
1432 .extra1 = &minolduid,
1433 .extra2 = &maxolduid,
1435 #ifdef CONFIG_FILE_LOCKING
1437 .procname = "leases-enable",
1438 .data = &leases_enable,
1439 .maxlen = sizeof(int),
1441 .proc_handler = proc_dointvec,
1444 #ifdef CONFIG_DNOTIFY
1446 .procname = "dir-notify-enable",
1447 .data = &dir_notify_enable,
1448 .maxlen = sizeof(int),
1450 .proc_handler = proc_dointvec,
1454 #ifdef CONFIG_FILE_LOCKING
1456 .procname = "lease-break-time",
1457 .data = &lease_break_time,
1458 .maxlen = sizeof(int),
1460 .proc_handler = proc_dointvec,
1465 .procname = "aio-nr",
1467 .maxlen = sizeof(aio_nr),
1469 .proc_handler = proc_doulongvec_minmax,
1472 .procname = "aio-max-nr",
1473 .data = &aio_max_nr,
1474 .maxlen = sizeof(aio_max_nr),
1476 .proc_handler = proc_doulongvec_minmax,
1478 #endif /* CONFIG_AIO */
1479 #ifdef CONFIG_INOTIFY_USER
1481 .procname = "inotify",
1483 .child = inotify_table,
1488 .procname = "epoll",
1490 .child = epoll_table,
1495 .procname = "suid_dumpable",
1496 .data = &suid_dumpable,
1497 .maxlen = sizeof(int),
1499 .proc_handler = proc_dointvec_minmax,
1503 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1505 .procname = "binfmt_misc",
1507 .child = binfmt_misc_table,
1511 .procname = "pipe-max-size",
1512 .data = &pipe_max_size,
1513 .maxlen = sizeof(int),
1515 .proc_handler = &pipe_proc_fn,
1516 .extra1 = &pipe_min_size,
1521 static struct ctl_table debug_table[] = {
1522 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1523 defined(CONFIG_S390) || defined(CONFIG_TILE)
1525 .procname = "exception-trace",
1526 .data = &show_unhandled_signals,
1527 .maxlen = sizeof(int),
1529 .proc_handler = proc_dointvec
1532 #if defined(CONFIG_OPTPROBES)
1534 .procname = "kprobes-optimization",
1535 .data = &sysctl_kprobes_optimization,
1536 .maxlen = sizeof(int),
1538 .proc_handler = proc_kprobes_optimization_handler,
1546 static struct ctl_table dev_table[] = {
1550 int __init sysctl_init(void)
1552 register_sysctl_table(sysctl_base_table);
1556 #endif /* CONFIG_SYSCTL */
1562 #ifdef CONFIG_PROC_SYSCTL
1564 static int _proc_do_string(void* data, int maxlen, int write,
1565 void __user *buffer,
1566 size_t *lenp, loff_t *ppos)
1572 if (!data || !maxlen || !*lenp) {
1580 while (len < *lenp) {
1581 if (get_user(c, p++))
1583 if (c == 0 || c == '\n')
1589 if(copy_from_user(data, buffer, len))
1591 ((char *) data)[len] = 0;
1609 if(copy_to_user(buffer, data, len))
1612 if(put_user('\n', ((char __user *) buffer) + len))
1623 * proc_dostring - read a string sysctl
1624 * @table: the sysctl table
1625 * @write: %TRUE if this is a write to the sysctl file
1626 * @buffer: the user buffer
1627 * @lenp: the size of the user buffer
1628 * @ppos: file position
1630 * Reads/writes a string from/to the user buffer. If the kernel
1631 * buffer provided is not large enough to hold the string, the
1632 * string is truncated. The copied string is %NULL-terminated.
1633 * If the string is being read by the user process, it is copied
1634 * and a newline '\n' is added. It is truncated if the buffer is
1637 * Returns 0 on success.
1639 int proc_dostring(struct ctl_table *table, int write,
1640 void __user *buffer, size_t *lenp, loff_t *ppos)
1642 return _proc_do_string(table->data, table->maxlen, write,
1643 buffer, lenp, ppos);
1646 static size_t proc_skip_spaces(char **buf)
1649 char *tmp = skip_spaces(*buf);
1655 static void proc_skip_char(char **buf, size_t *size, const char v)
1665 #define TMPBUFLEN 22
1667 * proc_get_long - reads an ASCII formatted integer from a user buffer
1669 * @buf: a kernel buffer
1670 * @size: size of the kernel buffer
1671 * @val: this is where the number will be stored
1672 * @neg: set to %TRUE if number is negative
1673 * @perm_tr: a vector which contains the allowed trailers
1674 * @perm_tr_len: size of the perm_tr vector
1675 * @tr: pointer to store the trailer character
1677 * In case of success %0 is returned and @buf and @size are updated with
1678 * the amount of bytes read. If @tr is non-NULL and a trailing
1679 * character exists (size is non-zero after returning from this
1680 * function), @tr is updated with the trailing character.
1682 static int proc_get_long(char **buf, size_t *size,
1683 unsigned long *val, bool *neg,
1684 const char *perm_tr, unsigned perm_tr_len, char *tr)
1687 char *p, tmp[TMPBUFLEN];
1693 if (len > TMPBUFLEN - 1)
1694 len = TMPBUFLEN - 1;
1696 memcpy(tmp, *buf, len);
1700 if (*p == '-' && *size > 1) {
1708 *val = simple_strtoul(p, &p, 0);
1712 /* We don't know if the next char is whitespace thus we may accept
1713 * invalid integers (e.g. 1234...a) or two integers instead of one
1714 * (e.g. 123...1). So lets not allow such large numbers. */
1715 if (len == TMPBUFLEN - 1)
1718 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1721 if (tr && (len < *size))
1731 * proc_put_long - converts an integer to a decimal ASCII formatted string
1733 * @buf: the user buffer
1734 * @size: the size of the user buffer
1735 * @val: the integer to be converted
1736 * @neg: sign of the number, %TRUE for negative
1738 * In case of success %0 is returned and @buf and @size are updated with
1739 * the amount of bytes written.
1741 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1745 char tmp[TMPBUFLEN], *p = tmp;
1747 sprintf(p, "%s%lu", neg ? "-" : "", val);
1751 if (copy_to_user(*buf, tmp, len))
1759 static int proc_put_char(void __user **buf, size_t *size, char c)
1762 char __user **buffer = (char __user **)buf;
1763 if (put_user(c, *buffer))
1765 (*size)--, (*buffer)++;
1771 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1773 int write, void *data)
1776 *valp = *negp ? -*lvalp : *lvalp;
1781 *lvalp = (unsigned long)-val;
1784 *lvalp = (unsigned long)val;
1790 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1792 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1793 int write, void __user *buffer,
1794 size_t *lenp, loff_t *ppos,
1795 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1796 int write, void *data),
1799 int *i, vleft, first = 1, err = 0;
1800 unsigned long page = 0;
1804 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1809 i = (int *) tbl_data;
1810 vleft = table->maxlen / sizeof(*i);
1814 conv = do_proc_dointvec_conv;
1817 if (left > PAGE_SIZE - 1)
1818 left = PAGE_SIZE - 1;
1819 page = __get_free_page(GFP_TEMPORARY);
1820 kbuf = (char *) page;
1823 if (copy_from_user(kbuf, buffer, left)) {
1830 for (; left && vleft--; i++, first=0) {
1835 left -= proc_skip_spaces(&kbuf);
1839 err = proc_get_long(&kbuf, &left, &lval, &neg,
1841 sizeof(proc_wspace_sep), NULL);
1844 if (conv(&neg, &lval, i, 1, data)) {
1849 if (conv(&neg, &lval, i, 0, data)) {
1854 err = proc_put_char(&buffer, &left, '\t');
1857 err = proc_put_long(&buffer, &left, lval, neg);
1863 if (!write && !first && left && !err)
1864 err = proc_put_char(&buffer, &left, '\n');
1865 if (write && !err && left)
1866 left -= proc_skip_spaces(&kbuf);
1871 return err ? : -EINVAL;
1878 static int do_proc_dointvec(struct ctl_table *table, int write,
1879 void __user *buffer, size_t *lenp, loff_t *ppos,
1880 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1881 int write, void *data),
1884 return __do_proc_dointvec(table->data, table, write,
1885 buffer, lenp, ppos, conv, data);
1889 * proc_dointvec - read a vector of integers
1890 * @table: the sysctl table
1891 * @write: %TRUE if this is a write to the sysctl file
1892 * @buffer: the user buffer
1893 * @lenp: the size of the user buffer
1894 * @ppos: file position
1896 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1897 * values from/to the user buffer, treated as an ASCII string.
1899 * Returns 0 on success.
1901 int proc_dointvec(struct ctl_table *table, int write,
1902 void __user *buffer, size_t *lenp, loff_t *ppos)
1904 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1909 * Taint values can only be increased
1910 * This means we can safely use a temporary.
1912 static int proc_taint(struct ctl_table *table, int write,
1913 void __user *buffer, size_t *lenp, loff_t *ppos)
1916 unsigned long tmptaint = get_taint();
1919 if (write && !capable(CAP_SYS_ADMIN))
1924 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1930 * Poor man's atomic or. Not worth adding a primitive
1931 * to everyone's atomic.h for this
1934 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1935 if ((tmptaint >> i) & 1)
1943 #ifdef CONFIG_PRINTK
1944 static int proc_dmesg_restrict(struct ctl_table *table, int write,
1945 void __user *buffer, size_t *lenp, loff_t *ppos)
1947 if (write && !capable(CAP_SYS_ADMIN))
1950 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1954 struct do_proc_dointvec_minmax_conv_param {
1959 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1961 int write, void *data)
1963 struct do_proc_dointvec_minmax_conv_param *param = data;
1965 int val = *negp ? -*lvalp : *lvalp;
1966 if ((param->min && *param->min > val) ||
1967 (param->max && *param->max < val))
1974 *lvalp = (unsigned long)-val;
1977 *lvalp = (unsigned long)val;
1984 * proc_dointvec_minmax - read a vector of integers with min/max values
1985 * @table: the sysctl table
1986 * @write: %TRUE if this is a write to the sysctl file
1987 * @buffer: the user buffer
1988 * @lenp: the size of the user buffer
1989 * @ppos: file position
1991 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1992 * values from/to the user buffer, treated as an ASCII string.
1994 * This routine will ensure the values are within the range specified by
1995 * table->extra1 (min) and table->extra2 (max).
1997 * Returns 0 on success.
1999 int proc_dointvec_minmax(struct ctl_table *table, int write,
2000 void __user *buffer, size_t *lenp, loff_t *ppos)
2002 struct do_proc_dointvec_minmax_conv_param param = {
2003 .min = (int *) table->extra1,
2004 .max = (int *) table->extra2,
2006 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2007 do_proc_dointvec_minmax_conv, ¶m);
2010 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2011 void __user *buffer,
2012 size_t *lenp, loff_t *ppos,
2013 unsigned long convmul,
2014 unsigned long convdiv)
2016 unsigned long *i, *min, *max;
2017 int vleft, first = 1, err = 0;
2018 unsigned long page = 0;
2022 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2027 i = (unsigned long *) data;
2028 min = (unsigned long *) table->extra1;
2029 max = (unsigned long *) table->extra2;
2030 vleft = table->maxlen / sizeof(unsigned long);
2034 if (left > PAGE_SIZE - 1)
2035 left = PAGE_SIZE - 1;
2036 page = __get_free_page(GFP_TEMPORARY);
2037 kbuf = (char *) page;
2040 if (copy_from_user(kbuf, buffer, left)) {
2047 for (; left && vleft--; i++, first = 0) {
2053 left -= proc_skip_spaces(&kbuf);
2055 err = proc_get_long(&kbuf, &left, &val, &neg,
2057 sizeof(proc_wspace_sep), NULL);
2062 if ((min && val < *min) || (max && val > *max))
2066 val = convdiv * (*i) / convmul;
2068 err = proc_put_char(&buffer, &left, '\t');
2069 err = proc_put_long(&buffer, &left, val, false);
2075 if (!write && !first && left && !err)
2076 err = proc_put_char(&buffer, &left, '\n');
2078 left -= proc_skip_spaces(&kbuf);
2083 return err ? : -EINVAL;
2090 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2091 void __user *buffer,
2092 size_t *lenp, loff_t *ppos,
2093 unsigned long convmul,
2094 unsigned long convdiv)
2096 return __do_proc_doulongvec_minmax(table->data, table, write,
2097 buffer, lenp, ppos, convmul, convdiv);
2101 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2102 * @table: the sysctl table
2103 * @write: %TRUE if this is a write to the sysctl file
2104 * @buffer: the user buffer
2105 * @lenp: the size of the user buffer
2106 * @ppos: file position
2108 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2109 * values from/to the user buffer, treated as an ASCII string.
2111 * This routine will ensure the values are within the range specified by
2112 * table->extra1 (min) and table->extra2 (max).
2114 * Returns 0 on success.
2116 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2117 void __user *buffer, size_t *lenp, loff_t *ppos)
2119 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2123 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2124 * @table: the sysctl table
2125 * @write: %TRUE if this is a write to the sysctl file
2126 * @buffer: the user buffer
2127 * @lenp: the size of the user buffer
2128 * @ppos: file position
2130 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2131 * values from/to the user buffer, treated as an ASCII string. The values
2132 * are treated as milliseconds, and converted to jiffies when they are stored.
2134 * This routine will ensure the values are within the range specified by
2135 * table->extra1 (min) and table->extra2 (max).
2137 * Returns 0 on success.
2139 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2140 void __user *buffer,
2141 size_t *lenp, loff_t *ppos)
2143 return do_proc_doulongvec_minmax(table, write, buffer,
2144 lenp, ppos, HZ, 1000l);
2148 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2150 int write, void *data)
2153 if (*lvalp > LONG_MAX / HZ)
2155 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2161 lval = (unsigned long)-val;
2164 lval = (unsigned long)val;
2171 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2173 int write, void *data)
2176 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2178 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2184 lval = (unsigned long)-val;
2187 lval = (unsigned long)val;
2189 *lvalp = jiffies_to_clock_t(lval);
2194 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2196 int write, void *data)
2199 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2205 lval = (unsigned long)-val;
2208 lval = (unsigned long)val;
2210 *lvalp = jiffies_to_msecs(lval);
2216 * proc_dointvec_jiffies - read a vector of integers as seconds
2217 * @table: the sysctl table
2218 * @write: %TRUE if this is a write to the sysctl file
2219 * @buffer: the user buffer
2220 * @lenp: the size of the user buffer
2221 * @ppos: file position
2223 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2224 * values from/to the user buffer, treated as an ASCII string.
2225 * The values read are assumed to be in seconds, and are converted into
2228 * Returns 0 on success.
2230 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2231 void __user *buffer, size_t *lenp, loff_t *ppos)
2233 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2234 do_proc_dointvec_jiffies_conv,NULL);
2238 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2239 * @table: the sysctl table
2240 * @write: %TRUE if this is a write to the sysctl file
2241 * @buffer: the user buffer
2242 * @lenp: the size of the user buffer
2243 * @ppos: pointer to the file position
2245 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2246 * values from/to the user buffer, treated as an ASCII string.
2247 * The values read are assumed to be in 1/USER_HZ seconds, and
2248 * are converted into jiffies.
2250 * Returns 0 on success.
2252 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2253 void __user *buffer, size_t *lenp, loff_t *ppos)
2255 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2256 do_proc_dointvec_userhz_jiffies_conv,NULL);
2260 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2261 * @table: the sysctl table
2262 * @write: %TRUE if this is a write to the sysctl file
2263 * @buffer: the user buffer
2264 * @lenp: the size of the user buffer
2265 * @ppos: file position
2266 * @ppos: the current position in the file
2268 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2269 * values from/to the user buffer, treated as an ASCII string.
2270 * The values read are assumed to be in 1/1000 seconds, and
2271 * are converted into jiffies.
2273 * Returns 0 on success.
2275 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2276 void __user *buffer, size_t *lenp, loff_t *ppos)
2278 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2279 do_proc_dointvec_ms_jiffies_conv, NULL);
2282 static int proc_do_cad_pid(struct ctl_table *table, int write,
2283 void __user *buffer, size_t *lenp, loff_t *ppos)
2285 struct pid *new_pid;
2289 tmp = pid_vnr(cad_pid);
2291 r = __do_proc_dointvec(&tmp, table, write, buffer,
2292 lenp, ppos, NULL, NULL);
2296 new_pid = find_get_pid(tmp);
2300 put_pid(xchg(&cad_pid, new_pid));
2305 * proc_do_large_bitmap - read/write from/to a large bitmap
2306 * @table: the sysctl table
2307 * @write: %TRUE if this is a write to the sysctl file
2308 * @buffer: the user buffer
2309 * @lenp: the size of the user buffer
2310 * @ppos: file position
2312 * The bitmap is stored at table->data and the bitmap length (in bits)
2315 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2316 * large bitmaps may be represented in a compact manner. Writing into
2317 * the file will clear the bitmap then update it with the given input.
2319 * Returns 0 on success.
2321 int proc_do_large_bitmap(struct ctl_table *table, int write,
2322 void __user *buffer, size_t *lenp, loff_t *ppos)
2326 size_t left = *lenp;
2327 unsigned long bitmap_len = table->maxlen;
2328 unsigned long *bitmap = (unsigned long *) table->data;
2329 unsigned long *tmp_bitmap = NULL;
2330 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2332 if (!bitmap_len || !left || (*ppos && !write)) {
2338 unsigned long page = 0;
2341 if (left > PAGE_SIZE - 1)
2342 left = PAGE_SIZE - 1;
2344 page = __get_free_page(GFP_TEMPORARY);
2345 kbuf = (char *) page;
2348 if (copy_from_user(kbuf, buffer, left)) {
2354 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2360 proc_skip_char(&kbuf, &left, '\n');
2361 while (!err && left) {
2362 unsigned long val_a, val_b;
2365 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2369 if (val_a >= bitmap_len || neg) {
2381 err = proc_get_long(&kbuf, &left, &val_b,
2382 &neg, tr_b, sizeof(tr_b),
2386 if (val_b >= bitmap_len || neg ||
2397 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2399 proc_skip_char(&kbuf, &left, '\n');
2403 unsigned long bit_a, bit_b = 0;
2406 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2407 if (bit_a >= bitmap_len)
2409 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2413 err = proc_put_char(&buffer, &left, ',');
2417 err = proc_put_long(&buffer, &left, bit_a, false);
2420 if (bit_a != bit_b) {
2421 err = proc_put_char(&buffer, &left, '-');
2424 err = proc_put_long(&buffer, &left, bit_b, false);
2432 err = proc_put_char(&buffer, &left, '\n');
2438 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2440 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2452 #else /* CONFIG_PROC_SYSCTL */
2454 int proc_dostring(struct ctl_table *table, int write,
2455 void __user *buffer, size_t *lenp, loff_t *ppos)
2460 int proc_dointvec(struct ctl_table *table, int write,
2461 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 int proc_dointvec_minmax(struct ctl_table *table, int write,
2467 void __user *buffer, size_t *lenp, loff_t *ppos)
2472 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2473 void __user *buffer, size_t *lenp, loff_t *ppos)
2478 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2479 void __user *buffer, size_t *lenp, loff_t *ppos)
2484 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2485 void __user *buffer, size_t *lenp, loff_t *ppos)
2490 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2491 void __user *buffer, size_t *lenp, loff_t *ppos)
2496 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2497 void __user *buffer,
2498 size_t *lenp, loff_t *ppos)
2504 #endif /* CONFIG_PROC_SYSCTL */
2507 * No sense putting this after each symbol definition, twice,
2508 * exception granted :-)
2510 EXPORT_SYMBOL(proc_dointvec);
2511 EXPORT_SYMBOL(proc_dointvec_jiffies);
2512 EXPORT_SYMBOL(proc_dointvec_minmax);
2513 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2514 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2515 EXPORT_SYMBOL(proc_dostring);
2516 EXPORT_SYMBOL(proc_doulongvec_minmax);
2517 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);