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;
140 static int ngroups_max = NGROUPS_MAX;
141 static const int cap_last_cap = CAP_LAST_CAP;
143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
155 extern int pwrsw_enabled;
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled;
163 extern int unaligned_dump_stack;
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning;
170 #ifdef CONFIG_PROC_SYSCTL
172 #define SYSCTL_WRITES_LEGACY -1
173 #define SYSCTL_WRITES_WARN 0
174 #define SYSCTL_WRITES_STRICT 1
176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
178 static int proc_do_cad_pid(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_taint(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #ifdef CONFIG_COREDUMP
192 static int proc_dostring_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
196 #ifdef CONFIG_MAGIC_SYSRQ
197 /* Note: sysrq code uses it's own private copy */
198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
200 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
201 void __user *buffer, size_t *lenp,
206 error = proc_dointvec(table, write, buffer, lenp, ppos);
211 sysrq_toggle_support(__sysrq_enabled);
218 static struct ctl_table kern_table[];
219 static struct ctl_table vm_table[];
220 static struct ctl_table fs_table[];
221 static struct ctl_table debug_table[];
222 static struct ctl_table dev_table[];
223 extern struct ctl_table random_table[];
225 extern struct ctl_table epoll_table[];
228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
229 int sysctl_legacy_va_layout;
232 /* The default sysctl tables: */
234 static struct ctl_table sysctl_base_table[] = {
236 .procname = "kernel",
253 .child = debug_table,
263 #ifdef CONFIG_SCHED_DEBUG
264 static int min_sched_granularity_ns = 100000; /* 100 usecs */
265 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 static int min_wakeup_granularity_ns; /* 0 usecs */
267 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
271 #endif /* CONFIG_SMP */
272 #endif /* CONFIG_SCHED_DEBUG */
274 #ifdef CONFIG_COMPACTION
275 static int min_extfrag_threshold;
276 static int max_extfrag_threshold = 1000;
279 static struct ctl_table kern_table[] = {
281 .procname = "sched_child_runs_first",
282 .data = &sysctl_sched_child_runs_first,
283 .maxlen = sizeof(unsigned int),
285 .proc_handler = proc_dointvec,
287 #ifdef CONFIG_SCHED_DEBUG
289 .procname = "sched_min_granularity_ns",
290 .data = &sysctl_sched_min_granularity,
291 .maxlen = sizeof(unsigned int),
293 .proc_handler = sched_proc_update_handler,
294 .extra1 = &min_sched_granularity_ns,
295 .extra2 = &max_sched_granularity_ns,
298 .procname = "sched_latency_ns",
299 .data = &sysctl_sched_latency,
300 .maxlen = sizeof(unsigned int),
302 .proc_handler = sched_proc_update_handler,
303 .extra1 = &min_sched_granularity_ns,
304 .extra2 = &max_sched_granularity_ns,
307 .procname = "sched_wakeup_granularity_ns",
308 .data = &sysctl_sched_wakeup_granularity,
309 .maxlen = sizeof(unsigned int),
311 .proc_handler = sched_proc_update_handler,
312 .extra1 = &min_wakeup_granularity_ns,
313 .extra2 = &max_wakeup_granularity_ns,
317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
321 .proc_handler = sched_proc_update_handler,
322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
326 .procname = "sched_migration_cost_ns",
327 .data = &sysctl_sched_migration_cost,
328 .maxlen = sizeof(unsigned int),
330 .proc_handler = proc_dointvec,
333 .procname = "sched_nr_migrate",
334 .data = &sysctl_sched_nr_migrate,
335 .maxlen = sizeof(unsigned int),
337 .proc_handler = proc_dointvec,
340 .procname = "sched_time_avg_ms",
341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
344 .proc_handler = proc_dointvec,
347 .procname = "sched_shares_window_ns",
348 .data = &sysctl_sched_shares_window,
349 .maxlen = sizeof(unsigned int),
351 .proc_handler = proc_dointvec,
354 .procname = "timer_migration",
355 .data = &sysctl_timer_migration,
356 .maxlen = sizeof(unsigned int),
358 .proc_handler = proc_dointvec_minmax,
362 #endif /* CONFIG_SMP */
363 #ifdef CONFIG_NUMA_BALANCING
365 .procname = "numa_balancing_scan_delay_ms",
366 .data = &sysctl_numa_balancing_scan_delay,
367 .maxlen = sizeof(unsigned int),
369 .proc_handler = proc_dointvec,
372 .procname = "numa_balancing_scan_period_min_ms",
373 .data = &sysctl_numa_balancing_scan_period_min,
374 .maxlen = sizeof(unsigned int),
376 .proc_handler = proc_dointvec,
379 .procname = "numa_balancing_scan_period_max_ms",
380 .data = &sysctl_numa_balancing_scan_period_max,
381 .maxlen = sizeof(unsigned int),
383 .proc_handler = proc_dointvec,
386 .procname = "numa_balancing_scan_size_mb",
387 .data = &sysctl_numa_balancing_scan_size,
388 .maxlen = sizeof(unsigned int),
390 .proc_handler = proc_dointvec,
393 .procname = "numa_balancing",
394 .data = NULL, /* filled in by handler */
395 .maxlen = sizeof(unsigned int),
397 .proc_handler = sysctl_numa_balancing,
401 #endif /* CONFIG_NUMA_BALANCING */
402 #endif /* CONFIG_SCHED_DEBUG */
404 .procname = "sched_rt_period_us",
405 .data = &sysctl_sched_rt_period,
406 .maxlen = sizeof(unsigned int),
408 .proc_handler = sched_rt_handler,
411 .procname = "sched_rt_runtime_us",
412 .data = &sysctl_sched_rt_runtime,
413 .maxlen = sizeof(int),
415 .proc_handler = sched_rt_handler,
418 .procname = "sched_rr_timeslice_ms",
419 .data = &sched_rr_timeslice,
420 .maxlen = sizeof(int),
422 .proc_handler = sched_rr_handler,
424 #ifdef CONFIG_SCHED_AUTOGROUP
426 .procname = "sched_autogroup_enabled",
427 .data = &sysctl_sched_autogroup_enabled,
428 .maxlen = sizeof(unsigned int),
430 .proc_handler = proc_dointvec_minmax,
435 #ifdef CONFIG_CFS_BANDWIDTH
437 .procname = "sched_cfs_bandwidth_slice_us",
438 .data = &sysctl_sched_cfs_bandwidth_slice,
439 .maxlen = sizeof(unsigned int),
441 .proc_handler = proc_dointvec_minmax,
445 #ifdef CONFIG_PROVE_LOCKING
447 .procname = "prove_locking",
448 .data = &prove_locking,
449 .maxlen = sizeof(int),
451 .proc_handler = proc_dointvec,
454 #ifdef CONFIG_LOCK_STAT
456 .procname = "lock_stat",
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec,
465 .data = &panic_timeout,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec,
470 #ifdef CONFIG_COREDUMP
472 .procname = "core_uses_pid",
473 .data = &core_uses_pid,
474 .maxlen = sizeof(int),
476 .proc_handler = proc_dointvec,
479 .procname = "core_pattern",
480 .data = core_pattern,
481 .maxlen = CORENAME_MAX_SIZE,
483 .proc_handler = proc_dostring_coredump,
486 .procname = "core_pipe_limit",
487 .data = &core_pipe_limit,
488 .maxlen = sizeof(unsigned int),
490 .proc_handler = proc_dointvec,
493 #ifdef CONFIG_PROC_SYSCTL
495 .procname = "tainted",
496 .maxlen = sizeof(long),
498 .proc_handler = proc_taint,
501 .procname = "sysctl_writes_strict",
502 .data = &sysctl_writes_strict,
503 .maxlen = sizeof(int),
505 .proc_handler = proc_dointvec_minmax,
510 #ifdef CONFIG_LATENCYTOP
512 .procname = "latencytop",
513 .data = &latencytop_enabled,
514 .maxlen = sizeof(int),
516 .proc_handler = proc_dointvec,
519 #ifdef CONFIG_BLK_DEV_INITRD
521 .procname = "real-root-dev",
522 .data = &real_root_dev,
523 .maxlen = sizeof(int),
525 .proc_handler = proc_dointvec,
529 .procname = "print-fatal-signals",
530 .data = &print_fatal_signals,
531 .maxlen = sizeof(int),
533 .proc_handler = proc_dointvec,
537 .procname = "reboot-cmd",
538 .data = reboot_command,
541 .proc_handler = proc_dostring,
544 .procname = "stop-a",
545 .data = &stop_a_enabled,
546 .maxlen = sizeof (int),
548 .proc_handler = proc_dointvec,
551 .procname = "scons-poweroff",
552 .data = &scons_pwroff,
553 .maxlen = sizeof (int),
555 .proc_handler = proc_dointvec,
558 #ifdef CONFIG_SPARC64
560 .procname = "tsb-ratio",
561 .data = &sysctl_tsb_ratio,
562 .maxlen = sizeof (int),
564 .proc_handler = proc_dointvec,
569 .procname = "soft-power",
570 .data = &pwrsw_enabled,
571 .maxlen = sizeof (int),
573 .proc_handler = proc_dointvec,
576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
578 .procname = "unaligned-trap",
579 .data = &unaligned_enabled,
580 .maxlen = sizeof (int),
582 .proc_handler = proc_dointvec,
586 .procname = "ctrl-alt-del",
588 .maxlen = sizeof(int),
590 .proc_handler = proc_dointvec,
592 #ifdef CONFIG_FUNCTION_TRACER
594 .procname = "ftrace_enabled",
595 .data = &ftrace_enabled,
596 .maxlen = sizeof(int),
598 .proc_handler = ftrace_enable_sysctl,
601 #ifdef CONFIG_STACK_TRACER
603 .procname = "stack_tracer_enabled",
604 .data = &stack_tracer_enabled,
605 .maxlen = sizeof(int),
607 .proc_handler = stack_trace_sysctl,
610 #ifdef CONFIG_TRACING
612 .procname = "ftrace_dump_on_oops",
613 .data = &ftrace_dump_on_oops,
614 .maxlen = sizeof(int),
616 .proc_handler = proc_dointvec,
619 .procname = "traceoff_on_warning",
620 .data = &__disable_trace_on_warning,
621 .maxlen = sizeof(__disable_trace_on_warning),
623 .proc_handler = proc_dointvec,
628 .procname = "kexec_load_disabled",
629 .data = &kexec_load_disabled,
630 .maxlen = sizeof(int),
632 /* only handle a transition from default "0" to "1" */
633 .proc_handler = proc_dointvec_minmax,
638 #ifdef CONFIG_MODULES
640 .procname = "modprobe",
641 .data = &modprobe_path,
642 .maxlen = KMOD_PATH_LEN,
644 .proc_handler = proc_dostring,
647 .procname = "modules_disabled",
648 .data = &modules_disabled,
649 .maxlen = sizeof(int),
651 /* only handle a transition from default "0" to "1" */
652 .proc_handler = proc_dointvec_minmax,
657 #ifdef CONFIG_UEVENT_HELPER
659 .procname = "hotplug",
660 .data = &uevent_helper,
661 .maxlen = UEVENT_HELPER_PATH_LEN,
663 .proc_handler = proc_dostring,
666 #ifdef CONFIG_CHR_DEV_SG
668 .procname = "sg-big-buff",
669 .data = &sg_big_buff,
670 .maxlen = sizeof (int),
672 .proc_handler = proc_dointvec,
675 #ifdef CONFIG_BSD_PROCESS_ACCT
679 .maxlen = 3*sizeof(int),
681 .proc_handler = proc_dointvec,
684 #ifdef CONFIG_MAGIC_SYSRQ
687 .data = &__sysrq_enabled,
688 .maxlen = sizeof (int),
690 .proc_handler = sysrq_sysctl_handler,
693 #ifdef CONFIG_PROC_SYSCTL
695 .procname = "cad_pid",
697 .maxlen = sizeof (int),
699 .proc_handler = proc_do_cad_pid,
703 .procname = "threads-max",
704 .data = &max_threads,
705 .maxlen = sizeof(int),
707 .proc_handler = proc_dointvec,
710 .procname = "random",
712 .child = random_table,
715 .procname = "usermodehelper",
717 .child = usermodehelper_table,
720 .procname = "overflowuid",
721 .data = &overflowuid,
722 .maxlen = sizeof(int),
724 .proc_handler = proc_dointvec_minmax,
725 .extra1 = &minolduid,
726 .extra2 = &maxolduid,
729 .procname = "overflowgid",
730 .data = &overflowgid,
731 .maxlen = sizeof(int),
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &minolduid,
735 .extra2 = &maxolduid,
738 #ifdef CONFIG_MATHEMU
740 .procname = "ieee_emulation_warnings",
741 .data = &sysctl_ieee_emulation_warnings,
742 .maxlen = sizeof(int),
744 .proc_handler = proc_dointvec,
748 .procname = "userprocess_debug",
749 .data = &show_unhandled_signals,
750 .maxlen = sizeof(int),
752 .proc_handler = proc_dointvec,
756 .procname = "pid_max",
758 .maxlen = sizeof (int),
760 .proc_handler = proc_dointvec_minmax,
761 .extra1 = &pid_max_min,
762 .extra2 = &pid_max_max,
765 .procname = "panic_on_oops",
766 .data = &panic_on_oops,
767 .maxlen = sizeof(int),
769 .proc_handler = proc_dointvec,
771 #if defined CONFIG_PRINTK
773 .procname = "printk",
774 .data = &console_loglevel,
775 .maxlen = 4*sizeof(int),
777 .proc_handler = proc_dointvec,
780 .procname = "printk_ratelimit",
781 .data = &printk_ratelimit_state.interval,
782 .maxlen = sizeof(int),
784 .proc_handler = proc_dointvec_jiffies,
787 .procname = "printk_ratelimit_burst",
788 .data = &printk_ratelimit_state.burst,
789 .maxlen = sizeof(int),
791 .proc_handler = proc_dointvec,
794 .procname = "printk_delay",
795 .data = &printk_delay_msec,
796 .maxlen = sizeof(int),
798 .proc_handler = proc_dointvec_minmax,
800 .extra2 = &ten_thousand,
803 .procname = "dmesg_restrict",
804 .data = &dmesg_restrict,
805 .maxlen = sizeof(int),
807 .proc_handler = proc_dointvec_minmax_sysadmin,
812 .procname = "kptr_restrict",
813 .data = &kptr_restrict,
814 .maxlen = sizeof(int),
816 .proc_handler = proc_dointvec_minmax_sysadmin,
822 .procname = "ngroups_max",
823 .data = &ngroups_max,
824 .maxlen = sizeof (int),
826 .proc_handler = proc_dointvec,
829 .procname = "cap_last_cap",
830 .data = (void *)&cap_last_cap,
831 .maxlen = sizeof(int),
833 .proc_handler = proc_dointvec,
835 #if defined(CONFIG_LOCKUP_DETECTOR)
837 .procname = "watchdog",
838 .data = &watchdog_user_enabled,
839 .maxlen = sizeof (int),
841 .proc_handler = proc_dowatchdog,
846 .procname = "watchdog_thresh",
847 .data = &watchdog_thresh,
848 .maxlen = sizeof(int),
850 .proc_handler = proc_dowatchdog,
855 .procname = "softlockup_panic",
856 .data = &softlockup_panic,
857 .maxlen = sizeof(int),
859 .proc_handler = proc_dointvec_minmax,
865 .procname = "softlockup_all_cpu_backtrace",
866 .data = &sysctl_softlockup_all_cpu_backtrace,
867 .maxlen = sizeof(int),
869 .proc_handler = proc_dointvec_minmax,
873 #endif /* CONFIG_SMP */
875 .procname = "nmi_watchdog",
876 .data = &watchdog_user_enabled,
877 .maxlen = sizeof (int),
879 .proc_handler = proc_dowatchdog,
884 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
886 .procname = "unknown_nmi_panic",
887 .data = &unknown_nmi_panic,
888 .maxlen = sizeof (int),
890 .proc_handler = proc_dointvec,
893 #if defined(CONFIG_X86)
895 .procname = "panic_on_unrecovered_nmi",
896 .data = &panic_on_unrecovered_nmi,
897 .maxlen = sizeof(int),
899 .proc_handler = proc_dointvec,
902 .procname = "panic_on_io_nmi",
903 .data = &panic_on_io_nmi,
904 .maxlen = sizeof(int),
906 .proc_handler = proc_dointvec,
908 #ifdef CONFIG_DEBUG_STACKOVERFLOW
910 .procname = "panic_on_stackoverflow",
911 .data = &sysctl_panic_on_stackoverflow,
912 .maxlen = sizeof(int),
914 .proc_handler = proc_dointvec,
918 .procname = "bootloader_type",
919 .data = &bootloader_type,
920 .maxlen = sizeof (int),
922 .proc_handler = proc_dointvec,
925 .procname = "bootloader_version",
926 .data = &bootloader_version,
927 .maxlen = sizeof (int),
929 .proc_handler = proc_dointvec,
932 .procname = "kstack_depth_to_print",
933 .data = &kstack_depth_to_print,
934 .maxlen = sizeof(int),
936 .proc_handler = proc_dointvec,
939 .procname = "io_delay_type",
940 .data = &io_delay_type,
941 .maxlen = sizeof(int),
943 .proc_handler = proc_dointvec,
946 #if defined(CONFIG_MMU)
948 .procname = "randomize_va_space",
949 .data = &randomize_va_space,
950 .maxlen = sizeof(int),
952 .proc_handler = proc_dointvec,
955 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
957 .procname = "spin_retry",
959 .maxlen = sizeof (int),
961 .proc_handler = proc_dointvec,
964 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
966 .procname = "acpi_video_flags",
967 .data = &acpi_realmode_flags,
968 .maxlen = sizeof (unsigned long),
970 .proc_handler = proc_doulongvec_minmax,
973 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
975 .procname = "ignore-unaligned-usertrap",
976 .data = &no_unaligned_warning,
977 .maxlen = sizeof (int),
979 .proc_handler = proc_dointvec,
984 .procname = "unaligned-dump-stack",
985 .data = &unaligned_dump_stack,
986 .maxlen = sizeof (int),
988 .proc_handler = proc_dointvec,
991 #ifdef CONFIG_DETECT_HUNG_TASK
993 .procname = "hung_task_panic",
994 .data = &sysctl_hung_task_panic,
995 .maxlen = sizeof(int),
997 .proc_handler = proc_dointvec_minmax,
1002 .procname = "hung_task_check_count",
1003 .data = &sysctl_hung_task_check_count,
1004 .maxlen = sizeof(int),
1006 .proc_handler = proc_dointvec_minmax,
1010 .procname = "hung_task_timeout_secs",
1011 .data = &sysctl_hung_task_timeout_secs,
1012 .maxlen = sizeof(unsigned long),
1014 .proc_handler = proc_dohung_task_timeout_secs,
1015 .extra2 = &hung_task_timeout_max,
1018 .procname = "hung_task_warnings",
1019 .data = &sysctl_hung_task_warnings,
1020 .maxlen = sizeof(int),
1022 .proc_handler = proc_dointvec_minmax,
1026 #ifdef CONFIG_COMPAT
1028 .procname = "compat-log",
1029 .data = &compat_log,
1030 .maxlen = sizeof (int),
1032 .proc_handler = proc_dointvec,
1035 #ifdef CONFIG_RT_MUTEXES
1037 .procname = "max_lock_depth",
1038 .data = &max_lock_depth,
1039 .maxlen = sizeof(int),
1041 .proc_handler = proc_dointvec,
1045 .procname = "poweroff_cmd",
1046 .data = &poweroff_cmd,
1047 .maxlen = POWEROFF_CMD_PATH_LEN,
1049 .proc_handler = proc_dostring,
1055 .child = key_sysctls,
1058 #ifdef CONFIG_RCU_TORTURE_TEST
1060 .procname = "rcutorture_runnable",
1061 .data = &rcutorture_runnable,
1062 .maxlen = sizeof(int),
1064 .proc_handler = proc_dointvec,
1067 #ifdef CONFIG_PERF_EVENTS
1069 * User-space scripts rely on the existence of this file
1070 * as a feature check for perf_events being enabled.
1072 * So it's an ABI, do not remove!
1075 .procname = "perf_event_paranoid",
1076 .data = &sysctl_perf_event_paranoid,
1077 .maxlen = sizeof(sysctl_perf_event_paranoid),
1079 .proc_handler = proc_dointvec,
1082 .procname = "perf_event_mlock_kb",
1083 .data = &sysctl_perf_event_mlock,
1084 .maxlen = sizeof(sysctl_perf_event_mlock),
1086 .proc_handler = proc_dointvec,
1089 .procname = "perf_event_max_sample_rate",
1090 .data = &sysctl_perf_event_sample_rate,
1091 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1093 .proc_handler = perf_proc_update_handler,
1097 .procname = "perf_cpu_time_max_percent",
1098 .data = &sysctl_perf_cpu_time_max_percent,
1099 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1101 .proc_handler = perf_cpu_time_max_percent_handler,
1103 .extra2 = &one_hundred,
1106 #ifdef CONFIG_KMEMCHECK
1108 .procname = "kmemcheck",
1109 .data = &kmemcheck_enabled,
1110 .maxlen = sizeof(int),
1112 .proc_handler = proc_dointvec,
1118 static struct ctl_table vm_table[] = {
1120 .procname = "overcommit_memory",
1121 .data = &sysctl_overcommit_memory,
1122 .maxlen = sizeof(sysctl_overcommit_memory),
1124 .proc_handler = proc_dointvec_minmax,
1129 .procname = "panic_on_oom",
1130 .data = &sysctl_panic_on_oom,
1131 .maxlen = sizeof(sysctl_panic_on_oom),
1133 .proc_handler = proc_dointvec_minmax,
1138 .procname = "oom_kill_allocating_task",
1139 .data = &sysctl_oom_kill_allocating_task,
1140 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1142 .proc_handler = proc_dointvec,
1145 .procname = "oom_dump_tasks",
1146 .data = &sysctl_oom_dump_tasks,
1147 .maxlen = sizeof(sysctl_oom_dump_tasks),
1149 .proc_handler = proc_dointvec,
1152 .procname = "overcommit_ratio",
1153 .data = &sysctl_overcommit_ratio,
1154 .maxlen = sizeof(sysctl_overcommit_ratio),
1156 .proc_handler = overcommit_ratio_handler,
1159 .procname = "overcommit_kbytes",
1160 .data = &sysctl_overcommit_kbytes,
1161 .maxlen = sizeof(sysctl_overcommit_kbytes),
1163 .proc_handler = overcommit_kbytes_handler,
1166 .procname = "page-cluster",
1167 .data = &page_cluster,
1168 .maxlen = sizeof(int),
1170 .proc_handler = proc_dointvec_minmax,
1174 .procname = "dirty_background_ratio",
1175 .data = &dirty_background_ratio,
1176 .maxlen = sizeof(dirty_background_ratio),
1178 .proc_handler = dirty_background_ratio_handler,
1180 .extra2 = &one_hundred,
1183 .procname = "dirty_background_bytes",
1184 .data = &dirty_background_bytes,
1185 .maxlen = sizeof(dirty_background_bytes),
1187 .proc_handler = dirty_background_bytes_handler,
1191 .procname = "dirty_ratio",
1192 .data = &vm_dirty_ratio,
1193 .maxlen = sizeof(vm_dirty_ratio),
1195 .proc_handler = dirty_ratio_handler,
1197 .extra2 = &one_hundred,
1200 .procname = "dirty_bytes",
1201 .data = &vm_dirty_bytes,
1202 .maxlen = sizeof(vm_dirty_bytes),
1204 .proc_handler = dirty_bytes_handler,
1205 .extra1 = &dirty_bytes_min,
1208 .procname = "dirty_writeback_centisecs",
1209 .data = &dirty_writeback_interval,
1210 .maxlen = sizeof(dirty_writeback_interval),
1212 .proc_handler = dirty_writeback_centisecs_handler,
1215 .procname = "dirty_expire_centisecs",
1216 .data = &dirty_expire_interval,
1217 .maxlen = sizeof(dirty_expire_interval),
1219 .proc_handler = proc_dointvec_minmax,
1223 .procname = "nr_pdflush_threads",
1224 .mode = 0444 /* read-only */,
1225 .proc_handler = pdflush_proc_obsolete,
1228 .procname = "swappiness",
1229 .data = &vm_swappiness,
1230 .maxlen = sizeof(vm_swappiness),
1232 .proc_handler = proc_dointvec_minmax,
1234 .extra2 = &one_hundred,
1236 #ifdef CONFIG_HUGETLB_PAGE
1238 .procname = "nr_hugepages",
1240 .maxlen = sizeof(unsigned long),
1242 .proc_handler = hugetlb_sysctl_handler,
1243 .extra1 = (void *)&hugetlb_zero,
1244 .extra2 = (void *)&hugetlb_infinity,
1248 .procname = "nr_hugepages_mempolicy",
1250 .maxlen = sizeof(unsigned long),
1252 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1253 .extra1 = (void *)&hugetlb_zero,
1254 .extra2 = (void *)&hugetlb_infinity,
1258 .procname = "hugetlb_shm_group",
1259 .data = &sysctl_hugetlb_shm_group,
1260 .maxlen = sizeof(gid_t),
1262 .proc_handler = proc_dointvec,
1265 .procname = "hugepages_treat_as_movable",
1266 .data = &hugepages_treat_as_movable,
1267 .maxlen = sizeof(int),
1269 .proc_handler = proc_dointvec,
1272 .procname = "nr_overcommit_hugepages",
1274 .maxlen = sizeof(unsigned long),
1276 .proc_handler = hugetlb_overcommit_handler,
1277 .extra1 = (void *)&hugetlb_zero,
1278 .extra2 = (void *)&hugetlb_infinity,
1282 .procname = "lowmem_reserve_ratio",
1283 .data = &sysctl_lowmem_reserve_ratio,
1284 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1286 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1289 .procname = "drop_caches",
1290 .data = &sysctl_drop_caches,
1291 .maxlen = sizeof(int),
1293 .proc_handler = drop_caches_sysctl_handler,
1297 #ifdef CONFIG_COMPACTION
1299 .procname = "compact_memory",
1300 .data = &sysctl_compact_memory,
1301 .maxlen = sizeof(int),
1303 .proc_handler = sysctl_compaction_handler,
1306 .procname = "extfrag_threshold",
1307 .data = &sysctl_extfrag_threshold,
1308 .maxlen = sizeof(int),
1310 .proc_handler = sysctl_extfrag_handler,
1311 .extra1 = &min_extfrag_threshold,
1312 .extra2 = &max_extfrag_threshold,
1315 #endif /* CONFIG_COMPACTION */
1317 .procname = "min_free_kbytes",
1318 .data = &min_free_kbytes,
1319 .maxlen = sizeof(min_free_kbytes),
1321 .proc_handler = min_free_kbytes_sysctl_handler,
1325 .procname = "percpu_pagelist_fraction",
1326 .data = &percpu_pagelist_fraction,
1327 .maxlen = sizeof(percpu_pagelist_fraction),
1329 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1334 .procname = "max_map_count",
1335 .data = &sysctl_max_map_count,
1336 .maxlen = sizeof(sysctl_max_map_count),
1338 .proc_handler = proc_dointvec_minmax,
1343 .procname = "nr_trim_pages",
1344 .data = &sysctl_nr_trim_pages,
1345 .maxlen = sizeof(sysctl_nr_trim_pages),
1347 .proc_handler = proc_dointvec_minmax,
1352 .procname = "laptop_mode",
1353 .data = &laptop_mode,
1354 .maxlen = sizeof(laptop_mode),
1356 .proc_handler = proc_dointvec_jiffies,
1359 .procname = "block_dump",
1360 .data = &block_dump,
1361 .maxlen = sizeof(block_dump),
1363 .proc_handler = proc_dointvec,
1367 .procname = "vfs_cache_pressure",
1368 .data = &sysctl_vfs_cache_pressure,
1369 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1371 .proc_handler = proc_dointvec,
1374 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1376 .procname = "legacy_va_layout",
1377 .data = &sysctl_legacy_va_layout,
1378 .maxlen = sizeof(sysctl_legacy_va_layout),
1380 .proc_handler = proc_dointvec,
1386 .procname = "zone_reclaim_mode",
1387 .data = &zone_reclaim_mode,
1388 .maxlen = sizeof(zone_reclaim_mode),
1390 .proc_handler = proc_dointvec,
1394 .procname = "min_unmapped_ratio",
1395 .data = &sysctl_min_unmapped_ratio,
1396 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1398 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1400 .extra2 = &one_hundred,
1403 .procname = "min_slab_ratio",
1404 .data = &sysctl_min_slab_ratio,
1405 .maxlen = sizeof(sysctl_min_slab_ratio),
1407 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1409 .extra2 = &one_hundred,
1414 .procname = "stat_interval",
1415 .data = &sysctl_stat_interval,
1416 .maxlen = sizeof(sysctl_stat_interval),
1418 .proc_handler = proc_dointvec_jiffies,
1423 .procname = "mmap_min_addr",
1424 .data = &dac_mmap_min_addr,
1425 .maxlen = sizeof(unsigned long),
1427 .proc_handler = mmap_min_addr_handler,
1432 .procname = "numa_zonelist_order",
1433 .data = &numa_zonelist_order,
1434 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1436 .proc_handler = numa_zonelist_order_handler,
1439 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1440 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1442 .procname = "vdso_enabled",
1443 #ifdef CONFIG_X86_32
1444 .data = &vdso32_enabled,
1445 .maxlen = sizeof(vdso32_enabled),
1447 .data = &vdso_enabled,
1448 .maxlen = sizeof(vdso_enabled),
1451 .proc_handler = proc_dointvec,
1455 #ifdef CONFIG_HIGHMEM
1457 .procname = "highmem_is_dirtyable",
1458 .data = &vm_highmem_is_dirtyable,
1459 .maxlen = sizeof(vm_highmem_is_dirtyable),
1461 .proc_handler = proc_dointvec_minmax,
1467 .procname = "scan_unevictable_pages",
1468 .data = &scan_unevictable_pages,
1469 .maxlen = sizeof(scan_unevictable_pages),
1471 .proc_handler = scan_unevictable_handler,
1473 #ifdef CONFIG_MEMORY_FAILURE
1475 .procname = "memory_failure_early_kill",
1476 .data = &sysctl_memory_failure_early_kill,
1477 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1479 .proc_handler = proc_dointvec_minmax,
1484 .procname = "memory_failure_recovery",
1485 .data = &sysctl_memory_failure_recovery,
1486 .maxlen = sizeof(sysctl_memory_failure_recovery),
1488 .proc_handler = proc_dointvec_minmax,
1494 .procname = "user_reserve_kbytes",
1495 .data = &sysctl_user_reserve_kbytes,
1496 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1498 .proc_handler = proc_doulongvec_minmax,
1501 .procname = "admin_reserve_kbytes",
1502 .data = &sysctl_admin_reserve_kbytes,
1503 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1505 .proc_handler = proc_doulongvec_minmax,
1510 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1511 static struct ctl_table binfmt_misc_table[] = {
1516 static struct ctl_table fs_table[] = {
1518 .procname = "inode-nr",
1519 .data = &inodes_stat,
1520 .maxlen = 2*sizeof(long),
1522 .proc_handler = proc_nr_inodes,
1525 .procname = "inode-state",
1526 .data = &inodes_stat,
1527 .maxlen = 7*sizeof(long),
1529 .proc_handler = proc_nr_inodes,
1532 .procname = "file-nr",
1533 .data = &files_stat,
1534 .maxlen = sizeof(files_stat),
1536 .proc_handler = proc_nr_files,
1539 .procname = "file-max",
1540 .data = &files_stat.max_files,
1541 .maxlen = sizeof(files_stat.max_files),
1543 .proc_handler = proc_doulongvec_minmax,
1546 .procname = "nr_open",
1547 .data = &sysctl_nr_open,
1548 .maxlen = sizeof(int),
1550 .proc_handler = proc_dointvec_minmax,
1551 .extra1 = &sysctl_nr_open_min,
1552 .extra2 = &sysctl_nr_open_max,
1555 .procname = "dentry-state",
1556 .data = &dentry_stat,
1557 .maxlen = 6*sizeof(long),
1559 .proc_handler = proc_nr_dentry,
1562 .procname = "overflowuid",
1563 .data = &fs_overflowuid,
1564 .maxlen = sizeof(int),
1566 .proc_handler = proc_dointvec_minmax,
1567 .extra1 = &minolduid,
1568 .extra2 = &maxolduid,
1571 .procname = "overflowgid",
1572 .data = &fs_overflowgid,
1573 .maxlen = sizeof(int),
1575 .proc_handler = proc_dointvec_minmax,
1576 .extra1 = &minolduid,
1577 .extra2 = &maxolduid,
1579 #ifdef CONFIG_FILE_LOCKING
1581 .procname = "leases-enable",
1582 .data = &leases_enable,
1583 .maxlen = sizeof(int),
1585 .proc_handler = proc_dointvec,
1588 #ifdef CONFIG_DNOTIFY
1590 .procname = "dir-notify-enable",
1591 .data = &dir_notify_enable,
1592 .maxlen = sizeof(int),
1594 .proc_handler = proc_dointvec,
1598 #ifdef CONFIG_FILE_LOCKING
1600 .procname = "lease-break-time",
1601 .data = &lease_break_time,
1602 .maxlen = sizeof(int),
1604 .proc_handler = proc_dointvec,
1609 .procname = "aio-nr",
1611 .maxlen = sizeof(aio_nr),
1613 .proc_handler = proc_doulongvec_minmax,
1616 .procname = "aio-max-nr",
1617 .data = &aio_max_nr,
1618 .maxlen = sizeof(aio_max_nr),
1620 .proc_handler = proc_doulongvec_minmax,
1622 #endif /* CONFIG_AIO */
1623 #ifdef CONFIG_INOTIFY_USER
1625 .procname = "inotify",
1627 .child = inotify_table,
1632 .procname = "epoll",
1634 .child = epoll_table,
1639 .procname = "protected_symlinks",
1640 .data = &sysctl_protected_symlinks,
1641 .maxlen = sizeof(int),
1643 .proc_handler = proc_dointvec_minmax,
1648 .procname = "protected_hardlinks",
1649 .data = &sysctl_protected_hardlinks,
1650 .maxlen = sizeof(int),
1652 .proc_handler = proc_dointvec_minmax,
1657 .procname = "suid_dumpable",
1658 .data = &suid_dumpable,
1659 .maxlen = sizeof(int),
1661 .proc_handler = proc_dointvec_minmax_coredump,
1665 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1667 .procname = "binfmt_misc",
1669 .child = binfmt_misc_table,
1673 .procname = "pipe-max-size",
1674 .data = &pipe_max_size,
1675 .maxlen = sizeof(int),
1677 .proc_handler = &pipe_proc_fn,
1678 .extra1 = &pipe_min_size,
1683 static struct ctl_table debug_table[] = {
1684 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1686 .procname = "exception-trace",
1687 .data = &show_unhandled_signals,
1688 .maxlen = sizeof(int),
1690 .proc_handler = proc_dointvec
1693 #if defined(CONFIG_OPTPROBES)
1695 .procname = "kprobes-optimization",
1696 .data = &sysctl_kprobes_optimization,
1697 .maxlen = sizeof(int),
1699 .proc_handler = proc_kprobes_optimization_handler,
1707 static struct ctl_table dev_table[] = {
1711 int __init sysctl_init(void)
1713 struct ctl_table_header *hdr;
1715 hdr = register_sysctl_table(sysctl_base_table);
1716 kmemleak_not_leak(hdr);
1720 #endif /* CONFIG_SYSCTL */
1726 #ifdef CONFIG_PROC_SYSCTL
1728 static int _proc_do_string(char *data, int maxlen, int write,
1729 char __user *buffer,
1730 size_t *lenp, loff_t *ppos)
1736 if (!data || !maxlen || !*lenp) {
1742 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1743 /* Only continue writes not past the end of buffer. */
1745 if (len > maxlen - 1)
1752 /* Start writing from beginning of buffer. */
1758 while ((p - buffer) < *lenp && len < maxlen - 1) {
1759 if (get_user(c, p++))
1761 if (c == 0 || c == '\n')
1782 if (copy_to_user(buffer, data, len))
1785 if (put_user('\n', buffer + len))
1795 static void warn_sysctl_write(struct ctl_table *table)
1797 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1798 "This will not be supported in the future. To silence this\n"
1799 "warning, set kernel.sysctl_writes_strict = -1\n",
1800 current->comm, table->procname);
1804 * proc_dostring - read a string sysctl
1805 * @table: the sysctl table
1806 * @write: %TRUE if this is a write to the sysctl file
1807 * @buffer: the user buffer
1808 * @lenp: the size of the user buffer
1809 * @ppos: file position
1811 * Reads/writes a string from/to the user buffer. If the kernel
1812 * buffer provided is not large enough to hold the string, the
1813 * string is truncated. The copied string is %NULL-terminated.
1814 * If the string is being read by the user process, it is copied
1815 * and a newline '\n' is added. It is truncated if the buffer is
1818 * Returns 0 on success.
1820 int proc_dostring(struct ctl_table *table, int write,
1821 void __user *buffer, size_t *lenp, loff_t *ppos)
1823 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1824 warn_sysctl_write(table);
1826 return _proc_do_string((char *)(table->data), table->maxlen, write,
1827 (char __user *)buffer, lenp, ppos);
1830 static size_t proc_skip_spaces(char **buf)
1833 char *tmp = skip_spaces(*buf);
1839 static void proc_skip_char(char **buf, size_t *size, const char v)
1849 #define TMPBUFLEN 22
1851 * proc_get_long - reads an ASCII formatted integer from a user buffer
1853 * @buf: a kernel buffer
1854 * @size: size of the kernel buffer
1855 * @val: this is where the number will be stored
1856 * @neg: set to %TRUE if number is negative
1857 * @perm_tr: a vector which contains the allowed trailers
1858 * @perm_tr_len: size of the perm_tr vector
1859 * @tr: pointer to store the trailer character
1861 * In case of success %0 is returned and @buf and @size are updated with
1862 * the amount of bytes read. If @tr is non-NULL and a trailing
1863 * character exists (size is non-zero after returning from this
1864 * function), @tr is updated with the trailing character.
1866 static int proc_get_long(char **buf, size_t *size,
1867 unsigned long *val, bool *neg,
1868 const char *perm_tr, unsigned perm_tr_len, char *tr)
1871 char *p, tmp[TMPBUFLEN];
1877 if (len > TMPBUFLEN - 1)
1878 len = TMPBUFLEN - 1;
1880 memcpy(tmp, *buf, len);
1884 if (*p == '-' && *size > 1) {
1892 *val = simple_strtoul(p, &p, 0);
1896 /* We don't know if the next char is whitespace thus we may accept
1897 * invalid integers (e.g. 1234...a) or two integers instead of one
1898 * (e.g. 123...1). So lets not allow such large numbers. */
1899 if (len == TMPBUFLEN - 1)
1902 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1905 if (tr && (len < *size))
1915 * proc_put_long - converts an integer to a decimal ASCII formatted string
1917 * @buf: the user buffer
1918 * @size: the size of the user buffer
1919 * @val: the integer to be converted
1920 * @neg: sign of the number, %TRUE for negative
1922 * In case of success %0 is returned and @buf and @size are updated with
1923 * the amount of bytes written.
1925 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1929 char tmp[TMPBUFLEN], *p = tmp;
1931 sprintf(p, "%s%lu", neg ? "-" : "", val);
1935 if (copy_to_user(*buf, tmp, len))
1943 static int proc_put_char(void __user **buf, size_t *size, char c)
1946 char __user **buffer = (char __user **)buf;
1947 if (put_user(c, *buffer))
1949 (*size)--, (*buffer)++;
1955 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1957 int write, void *data)
1960 *valp = *negp ? -*lvalp : *lvalp;
1965 *lvalp = (unsigned long)-val;
1968 *lvalp = (unsigned long)val;
1974 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1976 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1977 int write, void __user *buffer,
1978 size_t *lenp, loff_t *ppos,
1979 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1980 int write, void *data),
1983 int *i, vleft, first = 1, err = 0;
1984 unsigned long page = 0;
1988 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1993 i = (int *) tbl_data;
1994 vleft = table->maxlen / sizeof(*i);
1998 conv = do_proc_dointvec_conv;
2002 switch (sysctl_writes_strict) {
2003 case SYSCTL_WRITES_STRICT:
2005 case SYSCTL_WRITES_WARN:
2006 warn_sysctl_write(table);
2013 if (left > PAGE_SIZE - 1)
2014 left = PAGE_SIZE - 1;
2015 page = __get_free_page(GFP_TEMPORARY);
2016 kbuf = (char *) page;
2019 if (copy_from_user(kbuf, buffer, left)) {
2026 for (; left && vleft--; i++, first=0) {
2031 left -= proc_skip_spaces(&kbuf);
2035 err = proc_get_long(&kbuf, &left, &lval, &neg,
2037 sizeof(proc_wspace_sep), NULL);
2040 if (conv(&neg, &lval, i, 1, data)) {
2045 if (conv(&neg, &lval, i, 0, data)) {
2050 err = proc_put_char(&buffer, &left, '\t');
2053 err = proc_put_long(&buffer, &left, lval, neg);
2059 if (!write && !first && left && !err)
2060 err = proc_put_char(&buffer, &left, '\n');
2061 if (write && !err && left)
2062 left -= proc_skip_spaces(&kbuf);
2067 return err ? : -EINVAL;
2075 static int do_proc_dointvec(struct ctl_table *table, int write,
2076 void __user *buffer, size_t *lenp, loff_t *ppos,
2077 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2078 int write, void *data),
2081 return __do_proc_dointvec(table->data, table, write,
2082 buffer, lenp, ppos, conv, data);
2086 * proc_dointvec - read a vector of integers
2087 * @table: the sysctl table
2088 * @write: %TRUE if this is a write to the sysctl file
2089 * @buffer: the user buffer
2090 * @lenp: the size of the user buffer
2091 * @ppos: file position
2093 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2094 * values from/to the user buffer, treated as an ASCII string.
2096 * Returns 0 on success.
2098 int proc_dointvec(struct ctl_table *table, int write,
2099 void __user *buffer, size_t *lenp, loff_t *ppos)
2101 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2106 * Taint values can only be increased
2107 * This means we can safely use a temporary.
2109 static int proc_taint(struct ctl_table *table, int write,
2110 void __user *buffer, size_t *lenp, loff_t *ppos)
2113 unsigned long tmptaint = get_taint();
2116 if (write && !capable(CAP_SYS_ADMIN))
2121 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2127 * Poor man's atomic or. Not worth adding a primitive
2128 * to everyone's atomic.h for this
2131 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2132 if ((tmptaint >> i) & 1)
2133 add_taint(i, LOCKDEP_STILL_OK);
2140 #ifdef CONFIG_PRINTK
2141 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2142 void __user *buffer, size_t *lenp, loff_t *ppos)
2144 if (write && !capable(CAP_SYS_ADMIN))
2147 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2151 struct do_proc_dointvec_minmax_conv_param {
2156 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2158 int write, void *data)
2160 struct do_proc_dointvec_minmax_conv_param *param = data;
2162 int val = *negp ? -*lvalp : *lvalp;
2163 if ((param->min && *param->min > val) ||
2164 (param->max && *param->max < val))
2171 *lvalp = (unsigned long)-val;
2174 *lvalp = (unsigned long)val;
2181 * proc_dointvec_minmax - read a vector of integers with min/max values
2182 * @table: the sysctl table
2183 * @write: %TRUE if this is a write to the sysctl file
2184 * @buffer: the user buffer
2185 * @lenp: the size of the user buffer
2186 * @ppos: file position
2188 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2189 * values from/to the user buffer, treated as an ASCII string.
2191 * This routine will ensure the values are within the range specified by
2192 * table->extra1 (min) and table->extra2 (max).
2194 * Returns 0 on success.
2196 int proc_dointvec_minmax(struct ctl_table *table, int write,
2197 void __user *buffer, size_t *lenp, loff_t *ppos)
2199 struct do_proc_dointvec_minmax_conv_param param = {
2200 .min = (int *) table->extra1,
2201 .max = (int *) table->extra2,
2203 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2204 do_proc_dointvec_minmax_conv, ¶m);
2207 static void validate_coredump_safety(void)
2209 #ifdef CONFIG_COREDUMP
2210 if (suid_dumpable == SUID_DUMP_ROOT &&
2211 core_pattern[0] != '/' && core_pattern[0] != '|') {
2212 printk(KERN_WARNING "Unsafe core_pattern used with "\
2213 "suid_dumpable=2. Pipe handler or fully qualified "\
2214 "core dump path required.\n");
2219 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2220 void __user *buffer, size_t *lenp, loff_t *ppos)
2222 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2224 validate_coredump_safety();
2228 #ifdef CONFIG_COREDUMP
2229 static int proc_dostring_coredump(struct ctl_table *table, int write,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2232 int error = proc_dostring(table, write, buffer, lenp, ppos);
2234 validate_coredump_safety();
2239 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2240 void __user *buffer,
2241 size_t *lenp, loff_t *ppos,
2242 unsigned long convmul,
2243 unsigned long convdiv)
2245 unsigned long *i, *min, *max;
2246 int vleft, first = 1, err = 0;
2247 unsigned long page = 0;
2251 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2256 i = (unsigned long *) data;
2257 min = (unsigned long *) table->extra1;
2258 max = (unsigned long *) table->extra2;
2259 vleft = table->maxlen / sizeof(unsigned long);
2264 switch (sysctl_writes_strict) {
2265 case SYSCTL_WRITES_STRICT:
2267 case SYSCTL_WRITES_WARN:
2268 warn_sysctl_write(table);
2275 if (left > PAGE_SIZE - 1)
2276 left = PAGE_SIZE - 1;
2277 page = __get_free_page(GFP_TEMPORARY);
2278 kbuf = (char *) page;
2281 if (copy_from_user(kbuf, buffer, left)) {
2288 for (; left && vleft--; i++, first = 0) {
2294 left -= proc_skip_spaces(&kbuf);
2296 err = proc_get_long(&kbuf, &left, &val, &neg,
2298 sizeof(proc_wspace_sep), NULL);
2303 if ((min && val < *min) || (max && val > *max))
2307 val = convdiv * (*i) / convmul;
2309 err = proc_put_char(&buffer, &left, '\t');
2313 err = proc_put_long(&buffer, &left, val, false);
2319 if (!write && !first && left && !err)
2320 err = proc_put_char(&buffer, &left, '\n');
2322 left -= proc_skip_spaces(&kbuf);
2327 return err ? : -EINVAL;
2335 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2336 void __user *buffer,
2337 size_t *lenp, loff_t *ppos,
2338 unsigned long convmul,
2339 unsigned long convdiv)
2341 return __do_proc_doulongvec_minmax(table->data, table, write,
2342 buffer, lenp, ppos, convmul, convdiv);
2346 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2347 * @table: the sysctl table
2348 * @write: %TRUE if this is a write to the sysctl file
2349 * @buffer: the user buffer
2350 * @lenp: the size of the user buffer
2351 * @ppos: file position
2353 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2354 * values from/to the user buffer, treated as an ASCII string.
2356 * This routine will ensure the values are within the range specified by
2357 * table->extra1 (min) and table->extra2 (max).
2359 * Returns 0 on success.
2361 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2362 void __user *buffer, size_t *lenp, loff_t *ppos)
2364 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2368 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2369 * @table: the sysctl table
2370 * @write: %TRUE if this is a write to the sysctl file
2371 * @buffer: the user buffer
2372 * @lenp: the size of the user buffer
2373 * @ppos: file position
2375 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2376 * values from/to the user buffer, treated as an ASCII string. The values
2377 * are treated as milliseconds, and converted to jiffies when they are stored.
2379 * This routine will ensure the values are within the range specified by
2380 * table->extra1 (min) and table->extra2 (max).
2382 * Returns 0 on success.
2384 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2385 void __user *buffer,
2386 size_t *lenp, loff_t *ppos)
2388 return do_proc_doulongvec_minmax(table, write, buffer,
2389 lenp, ppos, HZ, 1000l);
2393 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2395 int write, void *data)
2398 if (*lvalp > LONG_MAX / HZ)
2400 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2406 lval = (unsigned long)-val;
2409 lval = (unsigned long)val;
2416 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2418 int write, void *data)
2421 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2423 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2429 lval = (unsigned long)-val;
2432 lval = (unsigned long)val;
2434 *lvalp = jiffies_to_clock_t(lval);
2439 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2441 int write, void *data)
2444 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2454 lval = (unsigned long)-val;
2457 lval = (unsigned long)val;
2459 *lvalp = jiffies_to_msecs(lval);
2465 * proc_dointvec_jiffies - read a vector of integers as seconds
2466 * @table: the sysctl table
2467 * @write: %TRUE if this is a write to the sysctl file
2468 * @buffer: the user buffer
2469 * @lenp: the size of the user buffer
2470 * @ppos: file position
2472 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2473 * values from/to the user buffer, treated as an ASCII string.
2474 * The values read are assumed to be in seconds, and are converted into
2477 * Returns 0 on success.
2479 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2480 void __user *buffer, size_t *lenp, loff_t *ppos)
2482 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2483 do_proc_dointvec_jiffies_conv,NULL);
2487 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2488 * @table: the sysctl table
2489 * @write: %TRUE if this is a write to the sysctl file
2490 * @buffer: the user buffer
2491 * @lenp: the size of the user buffer
2492 * @ppos: pointer to the file position
2494 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2495 * values from/to the user buffer, treated as an ASCII string.
2496 * The values read are assumed to be in 1/USER_HZ seconds, and
2497 * are converted into jiffies.
2499 * Returns 0 on success.
2501 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2502 void __user *buffer, size_t *lenp, loff_t *ppos)
2504 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2505 do_proc_dointvec_userhz_jiffies_conv,NULL);
2509 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2510 * @table: the sysctl table
2511 * @write: %TRUE if this is a write to the sysctl file
2512 * @buffer: the user buffer
2513 * @lenp: the size of the user buffer
2514 * @ppos: file position
2515 * @ppos: the current position in the file
2517 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2518 * values from/to the user buffer, treated as an ASCII string.
2519 * The values read are assumed to be in 1/1000 seconds, and
2520 * are converted into jiffies.
2522 * Returns 0 on success.
2524 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2525 void __user *buffer, size_t *lenp, loff_t *ppos)
2527 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2528 do_proc_dointvec_ms_jiffies_conv, NULL);
2531 static int proc_do_cad_pid(struct ctl_table *table, int write,
2532 void __user *buffer, size_t *lenp, loff_t *ppos)
2534 struct pid *new_pid;
2538 tmp = pid_vnr(cad_pid);
2540 r = __do_proc_dointvec(&tmp, table, write, buffer,
2541 lenp, ppos, NULL, NULL);
2545 new_pid = find_get_pid(tmp);
2549 put_pid(xchg(&cad_pid, new_pid));
2554 * proc_do_large_bitmap - read/write from/to a large bitmap
2555 * @table: the sysctl table
2556 * @write: %TRUE if this is a write to the sysctl file
2557 * @buffer: the user buffer
2558 * @lenp: the size of the user buffer
2559 * @ppos: file position
2561 * The bitmap is stored at table->data and the bitmap length (in bits)
2564 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2565 * large bitmaps may be represented in a compact manner. Writing into
2566 * the file will clear the bitmap then update it with the given input.
2568 * Returns 0 on success.
2570 int proc_do_large_bitmap(struct ctl_table *table, int write,
2571 void __user *buffer, size_t *lenp, loff_t *ppos)
2575 size_t left = *lenp;
2576 unsigned long bitmap_len = table->maxlen;
2577 unsigned long *bitmap = *(unsigned long **) table->data;
2578 unsigned long *tmp_bitmap = NULL;
2579 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2581 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2587 unsigned long page = 0;
2590 if (left > PAGE_SIZE - 1)
2591 left = PAGE_SIZE - 1;
2593 page = __get_free_page(GFP_TEMPORARY);
2594 kbuf = (char *) page;
2597 if (copy_from_user(kbuf, buffer, left)) {
2603 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2609 proc_skip_char(&kbuf, &left, '\n');
2610 while (!err && left) {
2611 unsigned long val_a, val_b;
2614 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2618 if (val_a >= bitmap_len || neg) {
2630 err = proc_get_long(&kbuf, &left, &val_b,
2631 &neg, tr_b, sizeof(tr_b),
2635 if (val_b >= bitmap_len || neg ||
2646 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2648 proc_skip_char(&kbuf, &left, '\n');
2652 unsigned long bit_a, bit_b = 0;
2655 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2656 if (bit_a >= bitmap_len)
2658 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2662 err = proc_put_char(&buffer, &left, ',');
2666 err = proc_put_long(&buffer, &left, bit_a, false);
2669 if (bit_a != bit_b) {
2670 err = proc_put_char(&buffer, &left, '-');
2673 err = proc_put_long(&buffer, &left, bit_b, false);
2681 err = proc_put_char(&buffer, &left, '\n');
2687 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2689 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2701 #else /* CONFIG_PROC_SYSCTL */
2703 int proc_dostring(struct ctl_table *table, int write,
2704 void __user *buffer, size_t *lenp, loff_t *ppos)
2709 int proc_dointvec(struct ctl_table *table, int write,
2710 void __user *buffer, size_t *lenp, loff_t *ppos)
2715 int proc_dointvec_minmax(struct ctl_table *table, int write,
2716 void __user *buffer, size_t *lenp, loff_t *ppos)
2721 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2722 void __user *buffer, size_t *lenp, loff_t *ppos)
2727 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2728 void __user *buffer, size_t *lenp, loff_t *ppos)
2733 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2734 void __user *buffer, size_t *lenp, loff_t *ppos)
2739 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2740 void __user *buffer, size_t *lenp, loff_t *ppos)
2745 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2746 void __user *buffer,
2747 size_t *lenp, loff_t *ppos)
2753 #endif /* CONFIG_PROC_SYSCTL */
2756 * No sense putting this after each symbol definition, twice,
2757 * exception granted :-)
2759 EXPORT_SYMBOL(proc_dointvec);
2760 EXPORT_SYMBOL(proc_dointvec_jiffies);
2761 EXPORT_SYMBOL(proc_dointvec_minmax);
2762 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2763 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2764 EXPORT_SYMBOL(proc_dostring);
2765 EXPORT_SYMBOL(proc_doulongvec_minmax);
2766 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);