2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/kexec.h>
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
72 #include <asm/stacktrace.h>
76 #include <asm/setup.h>
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
87 #ifdef CONFIG_CHR_DEV_SG
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
96 #if defined(CONFIG_SYSCTL)
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
113 extern int sysctl_nr_trim_pages;
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
121 static int __maybe_unused neg_one = -1;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
130 static int ten_thousand = 10000;
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
139 static int min_percpu_pagelist_fract = 8;
141 static int ngroups_max = NGROUPS_MAX;
142 static const int cap_last_cap = CAP_LAST_CAP;
144 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
145 #ifdef CONFIG_DETECT_HUNG_TASK
146 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
156 extern int pwrsw_enabled;
159 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
160 extern int unaligned_enabled;
164 extern int unaligned_dump_stack;
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
168 extern int no_unaligned_warning;
171 #ifdef CONFIG_PROC_SYSCTL
173 #define SYSCTL_WRITES_LEGACY -1
174 #define SYSCTL_WRITES_WARN 0
175 #define SYSCTL_WRITES_STRICT 1
177 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
179 static int proc_do_cad_pid(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 static int proc_taint(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
186 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
190 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #ifdef CONFIG_COREDUMP
193 static int proc_dostring_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
197 #ifdef CONFIG_MAGIC_SYSRQ
198 /* Note: sysrq code uses it's own private copy */
199 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
201 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
202 void __user *buffer, size_t *lenp,
207 error = proc_dointvec(table, write, buffer, lenp, ppos);
212 sysrq_toggle_support(__sysrq_enabled);
219 static struct ctl_table kern_table[];
220 static struct ctl_table vm_table[];
221 static struct ctl_table fs_table[];
222 static struct ctl_table debug_table[];
223 static struct ctl_table dev_table[];
224 extern struct ctl_table random_table[];
226 extern struct ctl_table epoll_table[];
229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
230 int sysctl_legacy_va_layout;
233 /* The default sysctl tables: */
235 static struct ctl_table sysctl_base_table[] = {
237 .procname = "kernel",
254 .child = debug_table,
264 #ifdef CONFIG_SCHED_DEBUG
265 static int min_sched_granularity_ns = 100000; /* 100 usecs */
266 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 static int min_wakeup_granularity_ns; /* 0 usecs */
268 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
272 #endif /* CONFIG_SMP */
273 #endif /* CONFIG_SCHED_DEBUG */
275 #ifdef CONFIG_COMPACTION
276 static int min_extfrag_threshold;
277 static int max_extfrag_threshold = 1000;
280 static struct ctl_table kern_table[] = {
282 .procname = "sched_child_runs_first",
283 .data = &sysctl_sched_child_runs_first,
284 .maxlen = sizeof(unsigned int),
286 .proc_handler = proc_dointvec,
288 #ifdef CONFIG_SCHED_DEBUG
290 .procname = "sched_min_granularity_ns",
291 .data = &sysctl_sched_min_granularity,
292 .maxlen = sizeof(unsigned int),
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
299 .procname = "sched_latency_ns",
300 .data = &sysctl_sched_latency,
301 .maxlen = sizeof(unsigned int),
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_sched_granularity_ns,
305 .extra2 = &max_sched_granularity_ns,
308 .procname = "sched_wakeup_granularity_ns",
309 .data = &sysctl_sched_wakeup_granularity,
310 .maxlen = sizeof(unsigned int),
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_wakeup_granularity_ns,
314 .extra2 = &max_wakeup_granularity_ns,
318 .procname = "sched_tunable_scaling",
319 .data = &sysctl_sched_tunable_scaling,
320 .maxlen = sizeof(enum sched_tunable_scaling),
322 .proc_handler = sched_proc_update_handler,
323 .extra1 = &min_sched_tunable_scaling,
324 .extra2 = &max_sched_tunable_scaling,
327 .procname = "sched_migration_cost_ns",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
331 .proc_handler = proc_dointvec,
334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
338 .proc_handler = proc_dointvec,
341 .procname = "sched_time_avg_ms",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
345 .proc_handler = proc_dointvec,
348 .procname = "sched_shares_window_ns",
349 .data = &sysctl_sched_shares_window,
350 .maxlen = sizeof(unsigned int),
352 .proc_handler = proc_dointvec,
355 .procname = "timer_migration",
356 .data = &sysctl_timer_migration,
357 .maxlen = sizeof(unsigned int),
359 .proc_handler = proc_dointvec_minmax,
363 #endif /* CONFIG_SMP */
364 #ifdef CONFIG_NUMA_BALANCING
366 .procname = "numa_balancing_scan_delay_ms",
367 .data = &sysctl_numa_balancing_scan_delay,
368 .maxlen = sizeof(unsigned int),
370 .proc_handler = proc_dointvec,
373 .procname = "numa_balancing_scan_period_min_ms",
374 .data = &sysctl_numa_balancing_scan_period_min,
375 .maxlen = sizeof(unsigned int),
377 .proc_handler = proc_dointvec,
380 .procname = "numa_balancing_scan_period_max_ms",
381 .data = &sysctl_numa_balancing_scan_period_max,
382 .maxlen = sizeof(unsigned int),
384 .proc_handler = proc_dointvec,
387 .procname = "numa_balancing_scan_size_mb",
388 .data = &sysctl_numa_balancing_scan_size,
389 .maxlen = sizeof(unsigned int),
391 .proc_handler = proc_dointvec,
394 .procname = "numa_balancing",
395 .data = NULL, /* filled in by handler */
396 .maxlen = sizeof(unsigned int),
398 .proc_handler = sysctl_numa_balancing,
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
405 .procname = "sched_rt_period_us",
406 .data = &sysctl_sched_rt_period,
407 .maxlen = sizeof(unsigned int),
409 .proc_handler = sched_rt_handler,
412 .procname = "sched_rt_runtime_us",
413 .data = &sysctl_sched_rt_runtime,
414 .maxlen = sizeof(int),
416 .proc_handler = sched_rt_handler,
419 .procname = "sched_rr_timeslice_ms",
420 .data = &sched_rr_timeslice,
421 .maxlen = sizeof(int),
423 .proc_handler = sched_rr_handler,
425 #ifdef CONFIG_SCHED_AUTOGROUP
427 .procname = "sched_autogroup_enabled",
428 .data = &sysctl_sched_autogroup_enabled,
429 .maxlen = sizeof(unsigned int),
431 .proc_handler = proc_dointvec_minmax,
436 #ifdef CONFIG_CFS_BANDWIDTH
438 .procname = "sched_cfs_bandwidth_slice_us",
439 .data = &sysctl_sched_cfs_bandwidth_slice,
440 .maxlen = sizeof(unsigned int),
442 .proc_handler = proc_dointvec_minmax,
446 #ifdef CONFIG_PROVE_LOCKING
448 .procname = "prove_locking",
449 .data = &prove_locking,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec,
455 #ifdef CONFIG_LOCK_STAT
457 .procname = "lock_stat",
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec,
466 .data = &panic_timeout,
467 .maxlen = sizeof(int),
469 .proc_handler = proc_dointvec,
471 #ifdef CONFIG_COREDUMP
473 .procname = "core_uses_pid",
474 .data = &core_uses_pid,
475 .maxlen = sizeof(int),
477 .proc_handler = proc_dointvec,
480 .procname = "core_pattern",
481 .data = core_pattern,
482 .maxlen = CORENAME_MAX_SIZE,
484 .proc_handler = proc_dostring_coredump,
487 .procname = "core_pipe_limit",
488 .data = &core_pipe_limit,
489 .maxlen = sizeof(unsigned int),
491 .proc_handler = proc_dointvec,
494 #ifdef CONFIG_PROC_SYSCTL
496 .procname = "tainted",
497 .maxlen = sizeof(long),
499 .proc_handler = proc_taint,
502 .procname = "sysctl_writes_strict",
503 .data = &sysctl_writes_strict,
504 .maxlen = sizeof(int),
506 .proc_handler = proc_dointvec_minmax,
511 #ifdef CONFIG_LATENCYTOP
513 .procname = "latencytop",
514 .data = &latencytop_enabled,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec,
520 #ifdef CONFIG_BLK_DEV_INITRD
522 .procname = "real-root-dev",
523 .data = &real_root_dev,
524 .maxlen = sizeof(int),
526 .proc_handler = proc_dointvec,
530 .procname = "print-fatal-signals",
531 .data = &print_fatal_signals,
532 .maxlen = sizeof(int),
534 .proc_handler = proc_dointvec,
538 .procname = "reboot-cmd",
539 .data = reboot_command,
542 .proc_handler = proc_dostring,
545 .procname = "stop-a",
546 .data = &stop_a_enabled,
547 .maxlen = sizeof (int),
549 .proc_handler = proc_dointvec,
552 .procname = "scons-poweroff",
553 .data = &scons_pwroff,
554 .maxlen = sizeof (int),
556 .proc_handler = proc_dointvec,
559 #ifdef CONFIG_SPARC64
561 .procname = "tsb-ratio",
562 .data = &sysctl_tsb_ratio,
563 .maxlen = sizeof (int),
565 .proc_handler = proc_dointvec,
570 .procname = "soft-power",
571 .data = &pwrsw_enabled,
572 .maxlen = sizeof (int),
574 .proc_handler = proc_dointvec,
577 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
579 .procname = "unaligned-trap",
580 .data = &unaligned_enabled,
581 .maxlen = sizeof (int),
583 .proc_handler = proc_dointvec,
587 .procname = "ctrl-alt-del",
589 .maxlen = sizeof(int),
591 .proc_handler = proc_dointvec,
593 #ifdef CONFIG_FUNCTION_TRACER
595 .procname = "ftrace_enabled",
596 .data = &ftrace_enabled,
597 .maxlen = sizeof(int),
599 .proc_handler = ftrace_enable_sysctl,
602 #ifdef CONFIG_STACK_TRACER
604 .procname = "stack_tracer_enabled",
605 .data = &stack_tracer_enabled,
606 .maxlen = sizeof(int),
608 .proc_handler = stack_trace_sysctl,
611 #ifdef CONFIG_TRACING
613 .procname = "ftrace_dump_on_oops",
614 .data = &ftrace_dump_on_oops,
615 .maxlen = sizeof(int),
617 .proc_handler = proc_dointvec,
620 .procname = "traceoff_on_warning",
621 .data = &__disable_trace_on_warning,
622 .maxlen = sizeof(__disable_trace_on_warning),
624 .proc_handler = proc_dointvec,
629 .procname = "kexec_load_disabled",
630 .data = &kexec_load_disabled,
631 .maxlen = sizeof(int),
633 /* only handle a transition from default "0" to "1" */
634 .proc_handler = proc_dointvec_minmax,
639 #ifdef CONFIG_MODULES
641 .procname = "modprobe",
642 .data = &modprobe_path,
643 .maxlen = KMOD_PATH_LEN,
645 .proc_handler = proc_dostring,
648 .procname = "modules_disabled",
649 .data = &modules_disabled,
650 .maxlen = sizeof(int),
652 /* only handle a transition from default "0" to "1" */
653 .proc_handler = proc_dointvec_minmax,
658 #ifdef CONFIG_UEVENT_HELPER
660 .procname = "hotplug",
661 .data = &uevent_helper,
662 .maxlen = UEVENT_HELPER_PATH_LEN,
664 .proc_handler = proc_dostring,
667 #ifdef CONFIG_CHR_DEV_SG
669 .procname = "sg-big-buff",
670 .data = &sg_big_buff,
671 .maxlen = sizeof (int),
673 .proc_handler = proc_dointvec,
676 #ifdef CONFIG_BSD_PROCESS_ACCT
680 .maxlen = 3*sizeof(int),
682 .proc_handler = proc_dointvec,
685 #ifdef CONFIG_MAGIC_SYSRQ
688 .data = &__sysrq_enabled,
689 .maxlen = sizeof (int),
691 .proc_handler = sysrq_sysctl_handler,
694 #ifdef CONFIG_PROC_SYSCTL
696 .procname = "cad_pid",
698 .maxlen = sizeof (int),
700 .proc_handler = proc_do_cad_pid,
704 .procname = "threads-max",
705 .data = &max_threads,
706 .maxlen = sizeof(int),
708 .proc_handler = proc_dointvec,
711 .procname = "random",
713 .child = random_table,
716 .procname = "usermodehelper",
718 .child = usermodehelper_table,
721 .procname = "overflowuid",
722 .data = &overflowuid,
723 .maxlen = sizeof(int),
725 .proc_handler = proc_dointvec_minmax,
726 .extra1 = &minolduid,
727 .extra2 = &maxolduid,
730 .procname = "overflowgid",
731 .data = &overflowgid,
732 .maxlen = sizeof(int),
734 .proc_handler = proc_dointvec_minmax,
735 .extra1 = &minolduid,
736 .extra2 = &maxolduid,
739 #ifdef CONFIG_MATHEMU
741 .procname = "ieee_emulation_warnings",
742 .data = &sysctl_ieee_emulation_warnings,
743 .maxlen = sizeof(int),
745 .proc_handler = proc_dointvec,
749 .procname = "userprocess_debug",
750 .data = &show_unhandled_signals,
751 .maxlen = sizeof(int),
753 .proc_handler = proc_dointvec,
757 .procname = "pid_max",
759 .maxlen = sizeof (int),
761 .proc_handler = proc_dointvec_minmax,
762 .extra1 = &pid_max_min,
763 .extra2 = &pid_max_max,
766 .procname = "panic_on_oops",
767 .data = &panic_on_oops,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec,
772 #if defined CONFIG_PRINTK
774 .procname = "printk",
775 .data = &console_loglevel,
776 .maxlen = 4*sizeof(int),
778 .proc_handler = proc_dointvec,
781 .procname = "printk_ratelimit",
782 .data = &printk_ratelimit_state.interval,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec_jiffies,
788 .procname = "printk_ratelimit_burst",
789 .data = &printk_ratelimit_state.burst,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec,
795 .procname = "printk_delay",
796 .data = &printk_delay_msec,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec_minmax,
801 .extra2 = &ten_thousand,
804 .procname = "dmesg_restrict",
805 .data = &dmesg_restrict,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec_minmax_sysadmin,
813 .procname = "kptr_restrict",
814 .data = &kptr_restrict,
815 .maxlen = sizeof(int),
817 .proc_handler = proc_dointvec_minmax_sysadmin,
823 .procname = "ngroups_max",
824 .data = &ngroups_max,
825 .maxlen = sizeof (int),
827 .proc_handler = proc_dointvec,
830 .procname = "cap_last_cap",
831 .data = (void *)&cap_last_cap,
832 .maxlen = sizeof(int),
834 .proc_handler = proc_dointvec,
836 #if defined(CONFIG_LOCKUP_DETECTOR)
838 .procname = "watchdog",
839 .data = &watchdog_user_enabled,
840 .maxlen = sizeof (int),
842 .proc_handler = proc_dowatchdog,
847 .procname = "watchdog_thresh",
848 .data = &watchdog_thresh,
849 .maxlen = sizeof(int),
851 .proc_handler = proc_dowatchdog,
856 .procname = "softlockup_panic",
857 .data = &softlockup_panic,
858 .maxlen = sizeof(int),
860 .proc_handler = proc_dointvec_minmax,
865 .procname = "nmi_watchdog",
866 .data = &watchdog_user_enabled,
867 .maxlen = sizeof (int),
869 .proc_handler = proc_dowatchdog,
874 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
876 .procname = "unknown_nmi_panic",
877 .data = &unknown_nmi_panic,
878 .maxlen = sizeof (int),
880 .proc_handler = proc_dointvec,
883 #if defined(CONFIG_X86)
885 .procname = "panic_on_unrecovered_nmi",
886 .data = &panic_on_unrecovered_nmi,
887 .maxlen = sizeof(int),
889 .proc_handler = proc_dointvec,
892 .procname = "panic_on_io_nmi",
893 .data = &panic_on_io_nmi,
894 .maxlen = sizeof(int),
896 .proc_handler = proc_dointvec,
898 #ifdef CONFIG_DEBUG_STACKOVERFLOW
900 .procname = "panic_on_stackoverflow",
901 .data = &sysctl_panic_on_stackoverflow,
902 .maxlen = sizeof(int),
904 .proc_handler = proc_dointvec,
908 .procname = "bootloader_type",
909 .data = &bootloader_type,
910 .maxlen = sizeof (int),
912 .proc_handler = proc_dointvec,
915 .procname = "bootloader_version",
916 .data = &bootloader_version,
917 .maxlen = sizeof (int),
919 .proc_handler = proc_dointvec,
922 .procname = "kstack_depth_to_print",
923 .data = &kstack_depth_to_print,
924 .maxlen = sizeof(int),
926 .proc_handler = proc_dointvec,
929 .procname = "io_delay_type",
930 .data = &io_delay_type,
931 .maxlen = sizeof(int),
933 .proc_handler = proc_dointvec,
936 #if defined(CONFIG_MMU)
938 .procname = "randomize_va_space",
939 .data = &randomize_va_space,
940 .maxlen = sizeof(int),
942 .proc_handler = proc_dointvec,
945 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
947 .procname = "spin_retry",
949 .maxlen = sizeof (int),
951 .proc_handler = proc_dointvec,
954 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
956 .procname = "acpi_video_flags",
957 .data = &acpi_realmode_flags,
958 .maxlen = sizeof (unsigned long),
960 .proc_handler = proc_doulongvec_minmax,
963 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
965 .procname = "ignore-unaligned-usertrap",
966 .data = &no_unaligned_warning,
967 .maxlen = sizeof (int),
969 .proc_handler = proc_dointvec,
974 .procname = "unaligned-dump-stack",
975 .data = &unaligned_dump_stack,
976 .maxlen = sizeof (int),
978 .proc_handler = proc_dointvec,
981 #ifdef CONFIG_DETECT_HUNG_TASK
983 .procname = "hung_task_panic",
984 .data = &sysctl_hung_task_panic,
985 .maxlen = sizeof(int),
987 .proc_handler = proc_dointvec_minmax,
992 .procname = "hung_task_check_count",
993 .data = &sysctl_hung_task_check_count,
994 .maxlen = sizeof(int),
996 .proc_handler = proc_dointvec_minmax,
1000 .procname = "hung_task_timeout_secs",
1001 .data = &sysctl_hung_task_timeout_secs,
1002 .maxlen = sizeof(unsigned long),
1004 .proc_handler = proc_dohung_task_timeout_secs,
1005 .extra2 = &hung_task_timeout_max,
1008 .procname = "hung_task_warnings",
1009 .data = &sysctl_hung_task_warnings,
1010 .maxlen = sizeof(int),
1012 .proc_handler = proc_dointvec_minmax,
1016 #ifdef CONFIG_COMPAT
1018 .procname = "compat-log",
1019 .data = &compat_log,
1020 .maxlen = sizeof (int),
1022 .proc_handler = proc_dointvec,
1025 #ifdef CONFIG_RT_MUTEXES
1027 .procname = "max_lock_depth",
1028 .data = &max_lock_depth,
1029 .maxlen = sizeof(int),
1031 .proc_handler = proc_dointvec,
1035 .procname = "poweroff_cmd",
1036 .data = &poweroff_cmd,
1037 .maxlen = POWEROFF_CMD_PATH_LEN,
1039 .proc_handler = proc_dostring,
1045 .child = key_sysctls,
1048 #ifdef CONFIG_RCU_TORTURE_TEST
1050 .procname = "rcutorture_runnable",
1051 .data = &rcutorture_runnable,
1052 .maxlen = sizeof(int),
1054 .proc_handler = proc_dointvec,
1057 #ifdef CONFIG_PERF_EVENTS
1059 * User-space scripts rely on the existence of this file
1060 * as a feature check for perf_events being enabled.
1062 * So it's an ABI, do not remove!
1065 .procname = "perf_event_paranoid",
1066 .data = &sysctl_perf_event_paranoid,
1067 .maxlen = sizeof(sysctl_perf_event_paranoid),
1069 .proc_handler = proc_dointvec,
1072 .procname = "perf_event_mlock_kb",
1073 .data = &sysctl_perf_event_mlock,
1074 .maxlen = sizeof(sysctl_perf_event_mlock),
1076 .proc_handler = proc_dointvec,
1079 .procname = "perf_event_max_sample_rate",
1080 .data = &sysctl_perf_event_sample_rate,
1081 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1083 .proc_handler = perf_proc_update_handler,
1087 .procname = "perf_cpu_time_max_percent",
1088 .data = &sysctl_perf_cpu_time_max_percent,
1089 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1091 .proc_handler = perf_cpu_time_max_percent_handler,
1093 .extra2 = &one_hundred,
1096 #ifdef CONFIG_KMEMCHECK
1098 .procname = "kmemcheck",
1099 .data = &kmemcheck_enabled,
1100 .maxlen = sizeof(int),
1102 .proc_handler = proc_dointvec,
1108 static struct ctl_table vm_table[] = {
1110 .procname = "overcommit_memory",
1111 .data = &sysctl_overcommit_memory,
1112 .maxlen = sizeof(sysctl_overcommit_memory),
1114 .proc_handler = proc_dointvec_minmax,
1119 .procname = "panic_on_oom",
1120 .data = &sysctl_panic_on_oom,
1121 .maxlen = sizeof(sysctl_panic_on_oom),
1123 .proc_handler = proc_dointvec_minmax,
1128 .procname = "oom_kill_allocating_task",
1129 .data = &sysctl_oom_kill_allocating_task,
1130 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1132 .proc_handler = proc_dointvec,
1135 .procname = "oom_dump_tasks",
1136 .data = &sysctl_oom_dump_tasks,
1137 .maxlen = sizeof(sysctl_oom_dump_tasks),
1139 .proc_handler = proc_dointvec,
1142 .procname = "overcommit_ratio",
1143 .data = &sysctl_overcommit_ratio,
1144 .maxlen = sizeof(sysctl_overcommit_ratio),
1146 .proc_handler = overcommit_ratio_handler,
1149 .procname = "overcommit_kbytes",
1150 .data = &sysctl_overcommit_kbytes,
1151 .maxlen = sizeof(sysctl_overcommit_kbytes),
1153 .proc_handler = overcommit_kbytes_handler,
1156 .procname = "page-cluster",
1157 .data = &page_cluster,
1158 .maxlen = sizeof(int),
1160 .proc_handler = proc_dointvec_minmax,
1164 .procname = "dirty_background_ratio",
1165 .data = &dirty_background_ratio,
1166 .maxlen = sizeof(dirty_background_ratio),
1168 .proc_handler = dirty_background_ratio_handler,
1170 .extra2 = &one_hundred,
1173 .procname = "dirty_background_bytes",
1174 .data = &dirty_background_bytes,
1175 .maxlen = sizeof(dirty_background_bytes),
1177 .proc_handler = dirty_background_bytes_handler,
1181 .procname = "dirty_ratio",
1182 .data = &vm_dirty_ratio,
1183 .maxlen = sizeof(vm_dirty_ratio),
1185 .proc_handler = dirty_ratio_handler,
1187 .extra2 = &one_hundred,
1190 .procname = "dirty_bytes",
1191 .data = &vm_dirty_bytes,
1192 .maxlen = sizeof(vm_dirty_bytes),
1194 .proc_handler = dirty_bytes_handler,
1195 .extra1 = &dirty_bytes_min,
1198 .procname = "dirty_writeback_centisecs",
1199 .data = &dirty_writeback_interval,
1200 .maxlen = sizeof(dirty_writeback_interval),
1202 .proc_handler = dirty_writeback_centisecs_handler,
1205 .procname = "dirty_expire_centisecs",
1206 .data = &dirty_expire_interval,
1207 .maxlen = sizeof(dirty_expire_interval),
1209 .proc_handler = proc_dointvec_minmax,
1213 .procname = "nr_pdflush_threads",
1214 .mode = 0444 /* read-only */,
1215 .proc_handler = pdflush_proc_obsolete,
1218 .procname = "swappiness",
1219 .data = &vm_swappiness,
1220 .maxlen = sizeof(vm_swappiness),
1222 .proc_handler = proc_dointvec_minmax,
1224 .extra2 = &one_hundred,
1226 #ifdef CONFIG_HUGETLB_PAGE
1228 .procname = "nr_hugepages",
1230 .maxlen = sizeof(unsigned long),
1232 .proc_handler = hugetlb_sysctl_handler,
1233 .extra1 = (void *)&hugetlb_zero,
1234 .extra2 = (void *)&hugetlb_infinity,
1238 .procname = "nr_hugepages_mempolicy",
1240 .maxlen = sizeof(unsigned long),
1242 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1243 .extra1 = (void *)&hugetlb_zero,
1244 .extra2 = (void *)&hugetlb_infinity,
1248 .procname = "hugetlb_shm_group",
1249 .data = &sysctl_hugetlb_shm_group,
1250 .maxlen = sizeof(gid_t),
1252 .proc_handler = proc_dointvec,
1255 .procname = "hugepages_treat_as_movable",
1256 .data = &hugepages_treat_as_movable,
1257 .maxlen = sizeof(int),
1259 .proc_handler = proc_dointvec,
1262 .procname = "nr_overcommit_hugepages",
1264 .maxlen = sizeof(unsigned long),
1266 .proc_handler = hugetlb_overcommit_handler,
1267 .extra1 = (void *)&hugetlb_zero,
1268 .extra2 = (void *)&hugetlb_infinity,
1272 .procname = "lowmem_reserve_ratio",
1273 .data = &sysctl_lowmem_reserve_ratio,
1274 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1276 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1279 .procname = "drop_caches",
1280 .data = &sysctl_drop_caches,
1281 .maxlen = sizeof(int),
1283 .proc_handler = drop_caches_sysctl_handler,
1287 #ifdef CONFIG_COMPACTION
1289 .procname = "compact_memory",
1290 .data = &sysctl_compact_memory,
1291 .maxlen = sizeof(int),
1293 .proc_handler = sysctl_compaction_handler,
1296 .procname = "extfrag_threshold",
1297 .data = &sysctl_extfrag_threshold,
1298 .maxlen = sizeof(int),
1300 .proc_handler = sysctl_extfrag_handler,
1301 .extra1 = &min_extfrag_threshold,
1302 .extra2 = &max_extfrag_threshold,
1305 #endif /* CONFIG_COMPACTION */
1307 .procname = "min_free_kbytes",
1308 .data = &min_free_kbytes,
1309 .maxlen = sizeof(min_free_kbytes),
1311 .proc_handler = min_free_kbytes_sysctl_handler,
1315 .procname = "percpu_pagelist_fraction",
1316 .data = &percpu_pagelist_fraction,
1317 .maxlen = sizeof(percpu_pagelist_fraction),
1319 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1320 .extra1 = &min_percpu_pagelist_fract,
1324 .procname = "max_map_count",
1325 .data = &sysctl_max_map_count,
1326 .maxlen = sizeof(sysctl_max_map_count),
1328 .proc_handler = proc_dointvec_minmax,
1333 .procname = "nr_trim_pages",
1334 .data = &sysctl_nr_trim_pages,
1335 .maxlen = sizeof(sysctl_nr_trim_pages),
1337 .proc_handler = proc_dointvec_minmax,
1342 .procname = "laptop_mode",
1343 .data = &laptop_mode,
1344 .maxlen = sizeof(laptop_mode),
1346 .proc_handler = proc_dointvec_jiffies,
1349 .procname = "block_dump",
1350 .data = &block_dump,
1351 .maxlen = sizeof(block_dump),
1353 .proc_handler = proc_dointvec,
1357 .procname = "vfs_cache_pressure",
1358 .data = &sysctl_vfs_cache_pressure,
1359 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1361 .proc_handler = proc_dointvec,
1364 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1366 .procname = "legacy_va_layout",
1367 .data = &sysctl_legacy_va_layout,
1368 .maxlen = sizeof(sysctl_legacy_va_layout),
1370 .proc_handler = proc_dointvec,
1376 .procname = "zone_reclaim_mode",
1377 .data = &zone_reclaim_mode,
1378 .maxlen = sizeof(zone_reclaim_mode),
1380 .proc_handler = proc_dointvec,
1384 .procname = "min_unmapped_ratio",
1385 .data = &sysctl_min_unmapped_ratio,
1386 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1388 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1390 .extra2 = &one_hundred,
1393 .procname = "min_slab_ratio",
1394 .data = &sysctl_min_slab_ratio,
1395 .maxlen = sizeof(sysctl_min_slab_ratio),
1397 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1399 .extra2 = &one_hundred,
1404 .procname = "stat_interval",
1405 .data = &sysctl_stat_interval,
1406 .maxlen = sizeof(sysctl_stat_interval),
1408 .proc_handler = proc_dointvec_jiffies,
1413 .procname = "mmap_min_addr",
1414 .data = &dac_mmap_min_addr,
1415 .maxlen = sizeof(unsigned long),
1417 .proc_handler = mmap_min_addr_handler,
1422 .procname = "numa_zonelist_order",
1423 .data = &numa_zonelist_order,
1424 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1426 .proc_handler = numa_zonelist_order_handler,
1429 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1430 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1432 .procname = "vdso_enabled",
1433 #ifdef CONFIG_X86_32
1434 .data = &vdso32_enabled,
1435 .maxlen = sizeof(vdso32_enabled),
1437 .data = &vdso_enabled,
1438 .maxlen = sizeof(vdso_enabled),
1441 .proc_handler = proc_dointvec,
1445 #ifdef CONFIG_HIGHMEM
1447 .procname = "highmem_is_dirtyable",
1448 .data = &vm_highmem_is_dirtyable,
1449 .maxlen = sizeof(vm_highmem_is_dirtyable),
1451 .proc_handler = proc_dointvec_minmax,
1457 .procname = "scan_unevictable_pages",
1458 .data = &scan_unevictable_pages,
1459 .maxlen = sizeof(scan_unevictable_pages),
1461 .proc_handler = scan_unevictable_handler,
1463 #ifdef CONFIG_MEMORY_FAILURE
1465 .procname = "memory_failure_early_kill",
1466 .data = &sysctl_memory_failure_early_kill,
1467 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1469 .proc_handler = proc_dointvec_minmax,
1474 .procname = "memory_failure_recovery",
1475 .data = &sysctl_memory_failure_recovery,
1476 .maxlen = sizeof(sysctl_memory_failure_recovery),
1478 .proc_handler = proc_dointvec_minmax,
1484 .procname = "user_reserve_kbytes",
1485 .data = &sysctl_user_reserve_kbytes,
1486 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1488 .proc_handler = proc_doulongvec_minmax,
1491 .procname = "admin_reserve_kbytes",
1492 .data = &sysctl_admin_reserve_kbytes,
1493 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1495 .proc_handler = proc_doulongvec_minmax,
1500 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1501 static struct ctl_table binfmt_misc_table[] = {
1506 static struct ctl_table fs_table[] = {
1508 .procname = "inode-nr",
1509 .data = &inodes_stat,
1510 .maxlen = 2*sizeof(long),
1512 .proc_handler = proc_nr_inodes,
1515 .procname = "inode-state",
1516 .data = &inodes_stat,
1517 .maxlen = 7*sizeof(long),
1519 .proc_handler = proc_nr_inodes,
1522 .procname = "file-nr",
1523 .data = &files_stat,
1524 .maxlen = sizeof(files_stat),
1526 .proc_handler = proc_nr_files,
1529 .procname = "file-max",
1530 .data = &files_stat.max_files,
1531 .maxlen = sizeof(files_stat.max_files),
1533 .proc_handler = proc_doulongvec_minmax,
1536 .procname = "nr_open",
1537 .data = &sysctl_nr_open,
1538 .maxlen = sizeof(int),
1540 .proc_handler = proc_dointvec_minmax,
1541 .extra1 = &sysctl_nr_open_min,
1542 .extra2 = &sysctl_nr_open_max,
1545 .procname = "dentry-state",
1546 .data = &dentry_stat,
1547 .maxlen = 6*sizeof(long),
1549 .proc_handler = proc_nr_dentry,
1552 .procname = "overflowuid",
1553 .data = &fs_overflowuid,
1554 .maxlen = sizeof(int),
1556 .proc_handler = proc_dointvec_minmax,
1557 .extra1 = &minolduid,
1558 .extra2 = &maxolduid,
1561 .procname = "overflowgid",
1562 .data = &fs_overflowgid,
1563 .maxlen = sizeof(int),
1565 .proc_handler = proc_dointvec_minmax,
1566 .extra1 = &minolduid,
1567 .extra2 = &maxolduid,
1569 #ifdef CONFIG_FILE_LOCKING
1571 .procname = "leases-enable",
1572 .data = &leases_enable,
1573 .maxlen = sizeof(int),
1575 .proc_handler = proc_dointvec,
1578 #ifdef CONFIG_DNOTIFY
1580 .procname = "dir-notify-enable",
1581 .data = &dir_notify_enable,
1582 .maxlen = sizeof(int),
1584 .proc_handler = proc_dointvec,
1588 #ifdef CONFIG_FILE_LOCKING
1590 .procname = "lease-break-time",
1591 .data = &lease_break_time,
1592 .maxlen = sizeof(int),
1594 .proc_handler = proc_dointvec,
1599 .procname = "aio-nr",
1601 .maxlen = sizeof(aio_nr),
1603 .proc_handler = proc_doulongvec_minmax,
1606 .procname = "aio-max-nr",
1607 .data = &aio_max_nr,
1608 .maxlen = sizeof(aio_max_nr),
1610 .proc_handler = proc_doulongvec_minmax,
1612 #endif /* CONFIG_AIO */
1613 #ifdef CONFIG_INOTIFY_USER
1615 .procname = "inotify",
1617 .child = inotify_table,
1622 .procname = "epoll",
1624 .child = epoll_table,
1629 .procname = "protected_symlinks",
1630 .data = &sysctl_protected_symlinks,
1631 .maxlen = sizeof(int),
1633 .proc_handler = proc_dointvec_minmax,
1638 .procname = "protected_hardlinks",
1639 .data = &sysctl_protected_hardlinks,
1640 .maxlen = sizeof(int),
1642 .proc_handler = proc_dointvec_minmax,
1647 .procname = "suid_dumpable",
1648 .data = &suid_dumpable,
1649 .maxlen = sizeof(int),
1651 .proc_handler = proc_dointvec_minmax_coredump,
1655 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1657 .procname = "binfmt_misc",
1659 .child = binfmt_misc_table,
1663 .procname = "pipe-max-size",
1664 .data = &pipe_max_size,
1665 .maxlen = sizeof(int),
1667 .proc_handler = &pipe_proc_fn,
1668 .extra1 = &pipe_min_size,
1673 static struct ctl_table debug_table[] = {
1674 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1676 .procname = "exception-trace",
1677 .data = &show_unhandled_signals,
1678 .maxlen = sizeof(int),
1680 .proc_handler = proc_dointvec
1683 #if defined(CONFIG_OPTPROBES)
1685 .procname = "kprobes-optimization",
1686 .data = &sysctl_kprobes_optimization,
1687 .maxlen = sizeof(int),
1689 .proc_handler = proc_kprobes_optimization_handler,
1697 static struct ctl_table dev_table[] = {
1701 int __init sysctl_init(void)
1703 struct ctl_table_header *hdr;
1705 hdr = register_sysctl_table(sysctl_base_table);
1706 kmemleak_not_leak(hdr);
1710 #endif /* CONFIG_SYSCTL */
1716 #ifdef CONFIG_PROC_SYSCTL
1718 static int _proc_do_string(char *data, int maxlen, int write,
1719 char __user *buffer,
1720 size_t *lenp, loff_t *ppos)
1726 if (!data || !maxlen || !*lenp) {
1732 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1733 /* Only continue writes not past the end of buffer. */
1735 if (len > maxlen - 1)
1742 /* Start writing from beginning of buffer. */
1748 while ((p - buffer) < *lenp && len < maxlen - 1) {
1749 if (get_user(c, p++))
1751 if (c == 0 || c == '\n')
1772 if (copy_to_user(buffer, data, len))
1775 if (put_user('\n', buffer + len))
1785 static void warn_sysctl_write(struct ctl_table *table)
1787 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1788 "This will not be supported in the future. To silence this\n"
1789 "warning, set kernel.sysctl_writes_strict = -1\n",
1790 current->comm, table->procname);
1794 * proc_dostring - read a string sysctl
1795 * @table: the sysctl table
1796 * @write: %TRUE if this is a write to the sysctl file
1797 * @buffer: the user buffer
1798 * @lenp: the size of the user buffer
1799 * @ppos: file position
1801 * Reads/writes a string from/to the user buffer. If the kernel
1802 * buffer provided is not large enough to hold the string, the
1803 * string is truncated. The copied string is %NULL-terminated.
1804 * If the string is being read by the user process, it is copied
1805 * and a newline '\n' is added. It is truncated if the buffer is
1808 * Returns 0 on success.
1810 int proc_dostring(struct ctl_table *table, int write,
1811 void __user *buffer, size_t *lenp, loff_t *ppos)
1813 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1814 warn_sysctl_write(table);
1816 return _proc_do_string((char *)(table->data), table->maxlen, write,
1817 (char __user *)buffer, lenp, ppos);
1820 static size_t proc_skip_spaces(char **buf)
1823 char *tmp = skip_spaces(*buf);
1829 static void proc_skip_char(char **buf, size_t *size, const char v)
1839 #define TMPBUFLEN 22
1841 * proc_get_long - reads an ASCII formatted integer from a user buffer
1843 * @buf: a kernel buffer
1844 * @size: size of the kernel buffer
1845 * @val: this is where the number will be stored
1846 * @neg: set to %TRUE if number is negative
1847 * @perm_tr: a vector which contains the allowed trailers
1848 * @perm_tr_len: size of the perm_tr vector
1849 * @tr: pointer to store the trailer character
1851 * In case of success %0 is returned and @buf and @size are updated with
1852 * the amount of bytes read. If @tr is non-NULL and a trailing
1853 * character exists (size is non-zero after returning from this
1854 * function), @tr is updated with the trailing character.
1856 static int proc_get_long(char **buf, size_t *size,
1857 unsigned long *val, bool *neg,
1858 const char *perm_tr, unsigned perm_tr_len, char *tr)
1861 char *p, tmp[TMPBUFLEN];
1867 if (len > TMPBUFLEN - 1)
1868 len = TMPBUFLEN - 1;
1870 memcpy(tmp, *buf, len);
1874 if (*p == '-' && *size > 1) {
1882 *val = simple_strtoul(p, &p, 0);
1886 /* We don't know if the next char is whitespace thus we may accept
1887 * invalid integers (e.g. 1234...a) or two integers instead of one
1888 * (e.g. 123...1). So lets not allow such large numbers. */
1889 if (len == TMPBUFLEN - 1)
1892 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1895 if (tr && (len < *size))
1905 * proc_put_long - converts an integer to a decimal ASCII formatted string
1907 * @buf: the user buffer
1908 * @size: the size of the user buffer
1909 * @val: the integer to be converted
1910 * @neg: sign of the number, %TRUE for negative
1912 * In case of success %0 is returned and @buf and @size are updated with
1913 * the amount of bytes written.
1915 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1919 char tmp[TMPBUFLEN], *p = tmp;
1921 sprintf(p, "%s%lu", neg ? "-" : "", val);
1925 if (copy_to_user(*buf, tmp, len))
1933 static int proc_put_char(void __user **buf, size_t *size, char c)
1936 char __user **buffer = (char __user **)buf;
1937 if (put_user(c, *buffer))
1939 (*size)--, (*buffer)++;
1945 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1947 int write, void *data)
1950 *valp = *negp ? -*lvalp : *lvalp;
1955 *lvalp = (unsigned long)-val;
1958 *lvalp = (unsigned long)val;
1964 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1966 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1967 int write, void __user *buffer,
1968 size_t *lenp, loff_t *ppos,
1969 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1970 int write, void *data),
1973 int *i, vleft, first = 1, err = 0;
1974 unsigned long page = 0;
1978 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1983 i = (int *) tbl_data;
1984 vleft = table->maxlen / sizeof(*i);
1988 conv = do_proc_dointvec_conv;
1992 switch (sysctl_writes_strict) {
1993 case SYSCTL_WRITES_STRICT:
1995 case SYSCTL_WRITES_WARN:
1996 warn_sysctl_write(table);
2003 if (left > PAGE_SIZE - 1)
2004 left = PAGE_SIZE - 1;
2005 page = __get_free_page(GFP_TEMPORARY);
2006 kbuf = (char *) page;
2009 if (copy_from_user(kbuf, buffer, left)) {
2016 for (; left && vleft--; i++, first=0) {
2021 left -= proc_skip_spaces(&kbuf);
2025 err = proc_get_long(&kbuf, &left, &lval, &neg,
2027 sizeof(proc_wspace_sep), NULL);
2030 if (conv(&neg, &lval, i, 1, data)) {
2035 if (conv(&neg, &lval, i, 0, data)) {
2040 err = proc_put_char(&buffer, &left, '\t');
2043 err = proc_put_long(&buffer, &left, lval, neg);
2049 if (!write && !first && left && !err)
2050 err = proc_put_char(&buffer, &left, '\n');
2051 if (write && !err && left)
2052 left -= proc_skip_spaces(&kbuf);
2057 return err ? : -EINVAL;
2065 static int do_proc_dointvec(struct ctl_table *table, int write,
2066 void __user *buffer, size_t *lenp, loff_t *ppos,
2067 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2068 int write, void *data),
2071 return __do_proc_dointvec(table->data, table, write,
2072 buffer, lenp, ppos, conv, data);
2076 * proc_dointvec - read a vector of integers
2077 * @table: the sysctl table
2078 * @write: %TRUE if this is a write to the sysctl file
2079 * @buffer: the user buffer
2080 * @lenp: the size of the user buffer
2081 * @ppos: file position
2083 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2084 * values from/to the user buffer, treated as an ASCII string.
2086 * Returns 0 on success.
2088 int proc_dointvec(struct ctl_table *table, int write,
2089 void __user *buffer, size_t *lenp, loff_t *ppos)
2091 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2096 * Taint values can only be increased
2097 * This means we can safely use a temporary.
2099 static int proc_taint(struct ctl_table *table, int write,
2100 void __user *buffer, size_t *lenp, loff_t *ppos)
2103 unsigned long tmptaint = get_taint();
2106 if (write && !capable(CAP_SYS_ADMIN))
2111 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2117 * Poor man's atomic or. Not worth adding a primitive
2118 * to everyone's atomic.h for this
2121 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2122 if ((tmptaint >> i) & 1)
2123 add_taint(i, LOCKDEP_STILL_OK);
2130 #ifdef CONFIG_PRINTK
2131 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2132 void __user *buffer, size_t *lenp, loff_t *ppos)
2134 if (write && !capable(CAP_SYS_ADMIN))
2137 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2141 struct do_proc_dointvec_minmax_conv_param {
2146 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2148 int write, void *data)
2150 struct do_proc_dointvec_minmax_conv_param *param = data;
2152 int val = *negp ? -*lvalp : *lvalp;
2153 if ((param->min && *param->min > val) ||
2154 (param->max && *param->max < val))
2161 *lvalp = (unsigned long)-val;
2164 *lvalp = (unsigned long)val;
2171 * proc_dointvec_minmax - read a vector of integers with min/max values
2172 * @table: the sysctl table
2173 * @write: %TRUE if this is a write to the sysctl file
2174 * @buffer: the user buffer
2175 * @lenp: the size of the user buffer
2176 * @ppos: file position
2178 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2179 * values from/to the user buffer, treated as an ASCII string.
2181 * This routine will ensure the values are within the range specified by
2182 * table->extra1 (min) and table->extra2 (max).
2184 * Returns 0 on success.
2186 int proc_dointvec_minmax(struct ctl_table *table, int write,
2187 void __user *buffer, size_t *lenp, loff_t *ppos)
2189 struct do_proc_dointvec_minmax_conv_param param = {
2190 .min = (int *) table->extra1,
2191 .max = (int *) table->extra2,
2193 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2194 do_proc_dointvec_minmax_conv, ¶m);
2197 static void validate_coredump_safety(void)
2199 #ifdef CONFIG_COREDUMP
2200 if (suid_dumpable == SUID_DUMP_ROOT &&
2201 core_pattern[0] != '/' && core_pattern[0] != '|') {
2202 printk(KERN_WARNING "Unsafe core_pattern used with "\
2203 "suid_dumpable=2. Pipe handler or fully qualified "\
2204 "core dump path required.\n");
2209 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2210 void __user *buffer, size_t *lenp, loff_t *ppos)
2212 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2214 validate_coredump_safety();
2218 #ifdef CONFIG_COREDUMP
2219 static int proc_dostring_coredump(struct ctl_table *table, int write,
2220 void __user *buffer, size_t *lenp, loff_t *ppos)
2222 int error = proc_dostring(table, write, buffer, lenp, ppos);
2224 validate_coredump_safety();
2229 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2230 void __user *buffer,
2231 size_t *lenp, loff_t *ppos,
2232 unsigned long convmul,
2233 unsigned long convdiv)
2235 unsigned long *i, *min, *max;
2236 int vleft, first = 1, err = 0;
2237 unsigned long page = 0;
2241 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2246 i = (unsigned long *) data;
2247 min = (unsigned long *) table->extra1;
2248 max = (unsigned long *) table->extra2;
2249 vleft = table->maxlen / sizeof(unsigned long);
2254 switch (sysctl_writes_strict) {
2255 case SYSCTL_WRITES_STRICT:
2257 case SYSCTL_WRITES_WARN:
2258 warn_sysctl_write(table);
2265 if (left > PAGE_SIZE - 1)
2266 left = PAGE_SIZE - 1;
2267 page = __get_free_page(GFP_TEMPORARY);
2268 kbuf = (char *) page;
2271 if (copy_from_user(kbuf, buffer, left)) {
2278 for (; left && vleft--; i++, first = 0) {
2284 left -= proc_skip_spaces(&kbuf);
2286 err = proc_get_long(&kbuf, &left, &val, &neg,
2288 sizeof(proc_wspace_sep), NULL);
2293 if ((min && val < *min) || (max && val > *max))
2297 val = convdiv * (*i) / convmul;
2299 err = proc_put_char(&buffer, &left, '\t');
2303 err = proc_put_long(&buffer, &left, val, false);
2309 if (!write && !first && left && !err)
2310 err = proc_put_char(&buffer, &left, '\n');
2312 left -= proc_skip_spaces(&kbuf);
2317 return err ? : -EINVAL;
2325 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2326 void __user *buffer,
2327 size_t *lenp, loff_t *ppos,
2328 unsigned long convmul,
2329 unsigned long convdiv)
2331 return __do_proc_doulongvec_minmax(table->data, table, write,
2332 buffer, lenp, ppos, convmul, convdiv);
2336 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2337 * @table: the sysctl table
2338 * @write: %TRUE if this is a write to the sysctl file
2339 * @buffer: the user buffer
2340 * @lenp: the size of the user buffer
2341 * @ppos: file position
2343 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2344 * values from/to the user buffer, treated as an ASCII string.
2346 * This routine will ensure the values are within the range specified by
2347 * table->extra1 (min) and table->extra2 (max).
2349 * Returns 0 on success.
2351 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2352 void __user *buffer, size_t *lenp, loff_t *ppos)
2354 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2358 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2359 * @table: the sysctl table
2360 * @write: %TRUE if this is a write to the sysctl file
2361 * @buffer: the user buffer
2362 * @lenp: the size of the user buffer
2363 * @ppos: file position
2365 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2366 * values from/to the user buffer, treated as an ASCII string. The values
2367 * are treated as milliseconds, and converted to jiffies when they are stored.
2369 * This routine will ensure the values are within the range specified by
2370 * table->extra1 (min) and table->extra2 (max).
2372 * Returns 0 on success.
2374 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2375 void __user *buffer,
2376 size_t *lenp, loff_t *ppos)
2378 return do_proc_doulongvec_minmax(table, write, buffer,
2379 lenp, ppos, HZ, 1000l);
2383 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2385 int write, void *data)
2388 if (*lvalp > LONG_MAX / HZ)
2390 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2396 lval = (unsigned long)-val;
2399 lval = (unsigned long)val;
2406 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2408 int write, void *data)
2411 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2413 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2419 lval = (unsigned long)-val;
2422 lval = (unsigned long)val;
2424 *lvalp = jiffies_to_clock_t(lval);
2429 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2431 int write, void *data)
2434 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2444 lval = (unsigned long)-val;
2447 lval = (unsigned long)val;
2449 *lvalp = jiffies_to_msecs(lval);
2455 * proc_dointvec_jiffies - read a vector of integers as seconds
2456 * @table: the sysctl table
2457 * @write: %TRUE if this is a write to the sysctl file
2458 * @buffer: the user buffer
2459 * @lenp: the size of the user buffer
2460 * @ppos: file position
2462 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2463 * values from/to the user buffer, treated as an ASCII string.
2464 * The values read are assumed to be in seconds, and are converted into
2467 * Returns 0 on success.
2469 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2470 void __user *buffer, size_t *lenp, loff_t *ppos)
2472 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2473 do_proc_dointvec_jiffies_conv,NULL);
2477 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2478 * @table: the sysctl table
2479 * @write: %TRUE if this is a write to the sysctl file
2480 * @buffer: the user buffer
2481 * @lenp: the size of the user buffer
2482 * @ppos: pointer to the file position
2484 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2485 * values from/to the user buffer, treated as an ASCII string.
2486 * The values read are assumed to be in 1/USER_HZ seconds, and
2487 * are converted into jiffies.
2489 * Returns 0 on success.
2491 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2492 void __user *buffer, size_t *lenp, loff_t *ppos)
2494 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2495 do_proc_dointvec_userhz_jiffies_conv,NULL);
2499 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2500 * @table: the sysctl table
2501 * @write: %TRUE if this is a write to the sysctl file
2502 * @buffer: the user buffer
2503 * @lenp: the size of the user buffer
2504 * @ppos: file position
2505 * @ppos: the current position in the file
2507 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2508 * values from/to the user buffer, treated as an ASCII string.
2509 * The values read are assumed to be in 1/1000 seconds, and
2510 * are converted into jiffies.
2512 * Returns 0 on success.
2514 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2515 void __user *buffer, size_t *lenp, loff_t *ppos)
2517 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2518 do_proc_dointvec_ms_jiffies_conv, NULL);
2521 static int proc_do_cad_pid(struct ctl_table *table, int write,
2522 void __user *buffer, size_t *lenp, loff_t *ppos)
2524 struct pid *new_pid;
2528 tmp = pid_vnr(cad_pid);
2530 r = __do_proc_dointvec(&tmp, table, write, buffer,
2531 lenp, ppos, NULL, NULL);
2535 new_pid = find_get_pid(tmp);
2539 put_pid(xchg(&cad_pid, new_pid));
2544 * proc_do_large_bitmap - read/write from/to a large bitmap
2545 * @table: the sysctl table
2546 * @write: %TRUE if this is a write to the sysctl file
2547 * @buffer: the user buffer
2548 * @lenp: the size of the user buffer
2549 * @ppos: file position
2551 * The bitmap is stored at table->data and the bitmap length (in bits)
2554 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2555 * large bitmaps may be represented in a compact manner. Writing into
2556 * the file will clear the bitmap then update it with the given input.
2558 * Returns 0 on success.
2560 int proc_do_large_bitmap(struct ctl_table *table, int write,
2561 void __user *buffer, size_t *lenp, loff_t *ppos)
2565 size_t left = *lenp;
2566 unsigned long bitmap_len = table->maxlen;
2567 unsigned long *bitmap = *(unsigned long **) table->data;
2568 unsigned long *tmp_bitmap = NULL;
2569 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2571 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2577 unsigned long page = 0;
2580 if (left > PAGE_SIZE - 1)
2581 left = PAGE_SIZE - 1;
2583 page = __get_free_page(GFP_TEMPORARY);
2584 kbuf = (char *) page;
2587 if (copy_from_user(kbuf, buffer, left)) {
2593 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2599 proc_skip_char(&kbuf, &left, '\n');
2600 while (!err && left) {
2601 unsigned long val_a, val_b;
2604 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2608 if (val_a >= bitmap_len || neg) {
2620 err = proc_get_long(&kbuf, &left, &val_b,
2621 &neg, tr_b, sizeof(tr_b),
2625 if (val_b >= bitmap_len || neg ||
2636 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2638 proc_skip_char(&kbuf, &left, '\n');
2642 unsigned long bit_a, bit_b = 0;
2645 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2646 if (bit_a >= bitmap_len)
2648 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2652 err = proc_put_char(&buffer, &left, ',');
2656 err = proc_put_long(&buffer, &left, bit_a, false);
2659 if (bit_a != bit_b) {
2660 err = proc_put_char(&buffer, &left, '-');
2663 err = proc_put_long(&buffer, &left, bit_b, false);
2671 err = proc_put_char(&buffer, &left, '\n');
2677 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2679 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2691 #else /* CONFIG_PROC_SYSCTL */
2693 int proc_dostring(struct ctl_table *table, int write,
2694 void __user *buffer, size_t *lenp, loff_t *ppos)
2699 int proc_dointvec(struct ctl_table *table, int write,
2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2705 int proc_dointvec_minmax(struct ctl_table *table, int write,
2706 void __user *buffer, size_t *lenp, loff_t *ppos)
2711 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2712 void __user *buffer, size_t *lenp, loff_t *ppos)
2717 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2723 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2729 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2735 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2736 void __user *buffer,
2737 size_t *lenp, loff_t *ppos)
2743 #endif /* CONFIG_PROC_SYSCTL */
2746 * No sense putting this after each symbol definition, twice,
2747 * exception granted :-)
2749 EXPORT_SYMBOL(proc_dointvec);
2750 EXPORT_SYMBOL(proc_dointvec_jiffies);
2751 EXPORT_SYMBOL(proc_dointvec_minmax);
2752 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2753 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2754 EXPORT_SYMBOL(proc_dostring);
2755 EXPORT_SYMBOL(proc_doulongvec_minmax);
2756 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);