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>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
68 #include <asm/uaccess.h>
69 #include <asm/processor.h>
73 #include <asm/stacktrace.h>
77 #include <asm/setup.h>
79 #ifdef CONFIG_BSD_PROCESS_ACCT
80 #include <linux/acct.h>
82 #ifdef CONFIG_RT_MUTEXES
83 #include <linux/rtmutex.h>
85 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
86 #include <linux/lockdep.h>
88 #ifdef CONFIG_CHR_DEV_SG
92 #ifdef CONFIG_LOCKUP_DETECTOR
93 #include <linux/nmi.h>
97 #if defined(CONFIG_SYSCTL)
99 /* External variables not in a header file. */
100 extern int max_threads;
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int compat_log;
111 extern int latencytop_enabled;
112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
114 extern int sysctl_nr_trim_pages;
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
122 static int __maybe_unused neg_one = -1;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
131 static int ten_thousand = 10000;
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid = 65535;
139 static int minolduid;
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_minmax,
395 .procname = "numa_balancing",
396 .data = NULL, /* filled in by handler */
397 .maxlen = sizeof(unsigned int),
399 .proc_handler = sysctl_numa_balancing,
403 #endif /* CONFIG_NUMA_BALANCING */
404 #endif /* CONFIG_SCHED_DEBUG */
406 .procname = "sched_rt_period_us",
407 .data = &sysctl_sched_rt_period,
408 .maxlen = sizeof(unsigned int),
410 .proc_handler = sched_rt_handler,
413 .procname = "sched_rt_runtime_us",
414 .data = &sysctl_sched_rt_runtime,
415 .maxlen = sizeof(int),
417 .proc_handler = sched_rt_handler,
420 .procname = "sched_rr_timeslice_ms",
421 .data = &sched_rr_timeslice,
422 .maxlen = sizeof(int),
424 .proc_handler = sched_rr_handler,
426 #ifdef CONFIG_SCHED_AUTOGROUP
428 .procname = "sched_autogroup_enabled",
429 .data = &sysctl_sched_autogroup_enabled,
430 .maxlen = sizeof(unsigned int),
432 .proc_handler = proc_dointvec_minmax,
437 #ifdef CONFIG_CFS_BANDWIDTH
439 .procname = "sched_cfs_bandwidth_slice_us",
440 .data = &sysctl_sched_cfs_bandwidth_slice,
441 .maxlen = sizeof(unsigned int),
443 .proc_handler = proc_dointvec_minmax,
447 #ifdef CONFIG_PROVE_LOCKING
449 .procname = "prove_locking",
450 .data = &prove_locking,
451 .maxlen = sizeof(int),
453 .proc_handler = proc_dointvec,
456 #ifdef CONFIG_LOCK_STAT
458 .procname = "lock_stat",
460 .maxlen = sizeof(int),
462 .proc_handler = proc_dointvec,
467 .data = &panic_timeout,
468 .maxlen = sizeof(int),
470 .proc_handler = proc_dointvec,
472 #ifdef CONFIG_COREDUMP
474 .procname = "core_uses_pid",
475 .data = &core_uses_pid,
476 .maxlen = sizeof(int),
478 .proc_handler = proc_dointvec,
481 .procname = "core_pattern",
482 .data = core_pattern,
483 .maxlen = CORENAME_MAX_SIZE,
485 .proc_handler = proc_dostring_coredump,
488 .procname = "core_pipe_limit",
489 .data = &core_pipe_limit,
490 .maxlen = sizeof(unsigned int),
492 .proc_handler = proc_dointvec,
495 #ifdef CONFIG_PROC_SYSCTL
497 .procname = "tainted",
498 .maxlen = sizeof(long),
500 .proc_handler = proc_taint,
503 .procname = "sysctl_writes_strict",
504 .data = &sysctl_writes_strict,
505 .maxlen = sizeof(int),
507 .proc_handler = proc_dointvec_minmax,
512 #ifdef CONFIG_LATENCYTOP
514 .procname = "latencytop",
515 .data = &latencytop_enabled,
516 .maxlen = sizeof(int),
518 .proc_handler = proc_dointvec,
521 #ifdef CONFIG_BLK_DEV_INITRD
523 .procname = "real-root-dev",
524 .data = &real_root_dev,
525 .maxlen = sizeof(int),
527 .proc_handler = proc_dointvec,
531 .procname = "print-fatal-signals",
532 .data = &print_fatal_signals,
533 .maxlen = sizeof(int),
535 .proc_handler = proc_dointvec,
539 .procname = "reboot-cmd",
540 .data = reboot_command,
543 .proc_handler = proc_dostring,
546 .procname = "stop-a",
547 .data = &stop_a_enabled,
548 .maxlen = sizeof (int),
550 .proc_handler = proc_dointvec,
553 .procname = "scons-poweroff",
554 .data = &scons_pwroff,
555 .maxlen = sizeof (int),
557 .proc_handler = proc_dointvec,
560 #ifdef CONFIG_SPARC64
562 .procname = "tsb-ratio",
563 .data = &sysctl_tsb_ratio,
564 .maxlen = sizeof (int),
566 .proc_handler = proc_dointvec,
571 .procname = "soft-power",
572 .data = &pwrsw_enabled,
573 .maxlen = sizeof (int),
575 .proc_handler = proc_dointvec,
578 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
580 .procname = "unaligned-trap",
581 .data = &unaligned_enabled,
582 .maxlen = sizeof (int),
584 .proc_handler = proc_dointvec,
588 .procname = "ctrl-alt-del",
590 .maxlen = sizeof(int),
592 .proc_handler = proc_dointvec,
594 #ifdef CONFIG_FUNCTION_TRACER
596 .procname = "ftrace_enabled",
597 .data = &ftrace_enabled,
598 .maxlen = sizeof(int),
600 .proc_handler = ftrace_enable_sysctl,
603 #ifdef CONFIG_STACK_TRACER
605 .procname = "stack_tracer_enabled",
606 .data = &stack_tracer_enabled,
607 .maxlen = sizeof(int),
609 .proc_handler = stack_trace_sysctl,
612 #ifdef CONFIG_TRACING
614 .procname = "ftrace_dump_on_oops",
615 .data = &ftrace_dump_on_oops,
616 .maxlen = sizeof(int),
618 .proc_handler = proc_dointvec,
621 .procname = "traceoff_on_warning",
622 .data = &__disable_trace_on_warning,
623 .maxlen = sizeof(__disable_trace_on_warning),
625 .proc_handler = proc_dointvec,
628 .procname = "tracepoint_printk",
629 .data = &tracepoint_printk,
630 .maxlen = sizeof(tracepoint_printk),
632 .proc_handler = proc_dointvec,
637 .procname = "kexec_load_disabled",
638 .data = &kexec_load_disabled,
639 .maxlen = sizeof(int),
641 /* only handle a transition from default "0" to "1" */
642 .proc_handler = proc_dointvec_minmax,
647 #ifdef CONFIG_MODULES
649 .procname = "modprobe",
650 .data = &modprobe_path,
651 .maxlen = KMOD_PATH_LEN,
653 .proc_handler = proc_dostring,
656 .procname = "modules_disabled",
657 .data = &modules_disabled,
658 .maxlen = sizeof(int),
660 /* only handle a transition from default "0" to "1" */
661 .proc_handler = proc_dointvec_minmax,
666 #ifdef CONFIG_UEVENT_HELPER
668 .procname = "hotplug",
669 .data = &uevent_helper,
670 .maxlen = UEVENT_HELPER_PATH_LEN,
672 .proc_handler = proc_dostring,
675 #ifdef CONFIG_CHR_DEV_SG
677 .procname = "sg-big-buff",
678 .data = &sg_big_buff,
679 .maxlen = sizeof (int),
681 .proc_handler = proc_dointvec,
684 #ifdef CONFIG_BSD_PROCESS_ACCT
688 .maxlen = 3*sizeof(int),
690 .proc_handler = proc_dointvec,
693 #ifdef CONFIG_MAGIC_SYSRQ
696 .data = &__sysrq_enabled,
697 .maxlen = sizeof (int),
699 .proc_handler = sysrq_sysctl_handler,
702 #ifdef CONFIG_PROC_SYSCTL
704 .procname = "cad_pid",
706 .maxlen = sizeof (int),
708 .proc_handler = proc_do_cad_pid,
712 .procname = "threads-max",
713 .data = &max_threads,
714 .maxlen = sizeof(int),
716 .proc_handler = proc_dointvec,
719 .procname = "random",
721 .child = random_table,
724 .procname = "usermodehelper",
726 .child = usermodehelper_table,
729 .procname = "overflowuid",
730 .data = &overflowuid,
731 .maxlen = sizeof(int),
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &minolduid,
735 .extra2 = &maxolduid,
738 .procname = "overflowgid",
739 .data = &overflowgid,
740 .maxlen = sizeof(int),
742 .proc_handler = proc_dointvec_minmax,
743 .extra1 = &minolduid,
744 .extra2 = &maxolduid,
747 #ifdef CONFIG_MATHEMU
749 .procname = "ieee_emulation_warnings",
750 .data = &sysctl_ieee_emulation_warnings,
751 .maxlen = sizeof(int),
753 .proc_handler = proc_dointvec,
757 .procname = "userprocess_debug",
758 .data = &show_unhandled_signals,
759 .maxlen = sizeof(int),
761 .proc_handler = proc_dointvec,
765 .procname = "pid_max",
767 .maxlen = sizeof (int),
769 .proc_handler = proc_dointvec_minmax,
770 .extra1 = &pid_max_min,
771 .extra2 = &pid_max_max,
774 .procname = "panic_on_oops",
775 .data = &panic_on_oops,
776 .maxlen = sizeof(int),
778 .proc_handler = proc_dointvec,
780 #if defined CONFIG_PRINTK
782 .procname = "printk",
783 .data = &console_loglevel,
784 .maxlen = 4*sizeof(int),
786 .proc_handler = proc_dointvec,
789 .procname = "printk_ratelimit",
790 .data = &printk_ratelimit_state.interval,
791 .maxlen = sizeof(int),
793 .proc_handler = proc_dointvec_jiffies,
796 .procname = "printk_ratelimit_burst",
797 .data = &printk_ratelimit_state.burst,
798 .maxlen = sizeof(int),
800 .proc_handler = proc_dointvec,
803 .procname = "printk_delay",
804 .data = &printk_delay_msec,
805 .maxlen = sizeof(int),
807 .proc_handler = proc_dointvec_minmax,
809 .extra2 = &ten_thousand,
812 .procname = "dmesg_restrict",
813 .data = &dmesg_restrict,
814 .maxlen = sizeof(int),
816 .proc_handler = proc_dointvec_minmax_sysadmin,
821 .procname = "kptr_restrict",
822 .data = &kptr_restrict,
823 .maxlen = sizeof(int),
825 .proc_handler = proc_dointvec_minmax_sysadmin,
831 .procname = "ngroups_max",
832 .data = &ngroups_max,
833 .maxlen = sizeof (int),
835 .proc_handler = proc_dointvec,
838 .procname = "cap_last_cap",
839 .data = (void *)&cap_last_cap,
840 .maxlen = sizeof(int),
842 .proc_handler = proc_dointvec,
844 #if defined(CONFIG_LOCKUP_DETECTOR)
846 .procname = "watchdog",
847 .data = &watchdog_user_enabled,
848 .maxlen = sizeof (int),
850 .proc_handler = proc_watchdog,
855 .procname = "watchdog_thresh",
856 .data = &watchdog_thresh,
857 .maxlen = sizeof(int),
859 .proc_handler = proc_watchdog_thresh,
864 .procname = "nmi_watchdog",
865 .data = &nmi_watchdog_enabled,
866 .maxlen = sizeof (int),
868 .proc_handler = proc_nmi_watchdog,
870 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
877 .procname = "soft_watchdog",
878 .data = &soft_watchdog_enabled,
879 .maxlen = sizeof (int),
881 .proc_handler = proc_soft_watchdog,
886 .procname = "softlockup_panic",
887 .data = &softlockup_panic,
888 .maxlen = sizeof(int),
890 .proc_handler = proc_dointvec_minmax,
896 .procname = "softlockup_all_cpu_backtrace",
897 .data = &sysctl_softlockup_all_cpu_backtrace,
898 .maxlen = sizeof(int),
900 .proc_handler = proc_dointvec_minmax,
904 #endif /* CONFIG_SMP */
906 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
908 .procname = "unknown_nmi_panic",
909 .data = &unknown_nmi_panic,
910 .maxlen = sizeof (int),
912 .proc_handler = proc_dointvec,
915 #if defined(CONFIG_X86)
917 .procname = "panic_on_unrecovered_nmi",
918 .data = &panic_on_unrecovered_nmi,
919 .maxlen = sizeof(int),
921 .proc_handler = proc_dointvec,
924 .procname = "panic_on_io_nmi",
925 .data = &panic_on_io_nmi,
926 .maxlen = sizeof(int),
928 .proc_handler = proc_dointvec,
930 #ifdef CONFIG_DEBUG_STACKOVERFLOW
932 .procname = "panic_on_stackoverflow",
933 .data = &sysctl_panic_on_stackoverflow,
934 .maxlen = sizeof(int),
936 .proc_handler = proc_dointvec,
940 .procname = "bootloader_type",
941 .data = &bootloader_type,
942 .maxlen = sizeof (int),
944 .proc_handler = proc_dointvec,
947 .procname = "bootloader_version",
948 .data = &bootloader_version,
949 .maxlen = sizeof (int),
951 .proc_handler = proc_dointvec,
954 .procname = "kstack_depth_to_print",
955 .data = &kstack_depth_to_print,
956 .maxlen = sizeof(int),
958 .proc_handler = proc_dointvec,
961 .procname = "io_delay_type",
962 .data = &io_delay_type,
963 .maxlen = sizeof(int),
965 .proc_handler = proc_dointvec,
968 #if defined(CONFIG_MMU)
970 .procname = "randomize_va_space",
971 .data = &randomize_va_space,
972 .maxlen = sizeof(int),
974 .proc_handler = proc_dointvec,
977 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
979 .procname = "spin_retry",
981 .maxlen = sizeof (int),
983 .proc_handler = proc_dointvec,
986 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
988 .procname = "acpi_video_flags",
989 .data = &acpi_realmode_flags,
990 .maxlen = sizeof (unsigned long),
992 .proc_handler = proc_doulongvec_minmax,
995 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
997 .procname = "ignore-unaligned-usertrap",
998 .data = &no_unaligned_warning,
999 .maxlen = sizeof (int),
1001 .proc_handler = proc_dointvec,
1006 .procname = "unaligned-dump-stack",
1007 .data = &unaligned_dump_stack,
1008 .maxlen = sizeof (int),
1010 .proc_handler = proc_dointvec,
1013 #ifdef CONFIG_DETECT_HUNG_TASK
1015 .procname = "hung_task_panic",
1016 .data = &sysctl_hung_task_panic,
1017 .maxlen = sizeof(int),
1019 .proc_handler = proc_dointvec_minmax,
1024 .procname = "hung_task_check_count",
1025 .data = &sysctl_hung_task_check_count,
1026 .maxlen = sizeof(int),
1028 .proc_handler = proc_dointvec_minmax,
1032 .procname = "hung_task_timeout_secs",
1033 .data = &sysctl_hung_task_timeout_secs,
1034 .maxlen = sizeof(unsigned long),
1036 .proc_handler = proc_dohung_task_timeout_secs,
1037 .extra2 = &hung_task_timeout_max,
1040 .procname = "hung_task_warnings",
1041 .data = &sysctl_hung_task_warnings,
1042 .maxlen = sizeof(int),
1044 .proc_handler = proc_dointvec_minmax,
1048 #ifdef CONFIG_COMPAT
1050 .procname = "compat-log",
1051 .data = &compat_log,
1052 .maxlen = sizeof (int),
1054 .proc_handler = proc_dointvec,
1057 #ifdef CONFIG_RT_MUTEXES
1059 .procname = "max_lock_depth",
1060 .data = &max_lock_depth,
1061 .maxlen = sizeof(int),
1063 .proc_handler = proc_dointvec,
1067 .procname = "poweroff_cmd",
1068 .data = &poweroff_cmd,
1069 .maxlen = POWEROFF_CMD_PATH_LEN,
1071 .proc_handler = proc_dostring,
1077 .child = key_sysctls,
1080 #ifdef CONFIG_PERF_EVENTS
1082 * User-space scripts rely on the existence of this file
1083 * as a feature check for perf_events being enabled.
1085 * So it's an ABI, do not remove!
1088 .procname = "perf_event_paranoid",
1089 .data = &sysctl_perf_event_paranoid,
1090 .maxlen = sizeof(sysctl_perf_event_paranoid),
1092 .proc_handler = proc_dointvec,
1095 .procname = "perf_event_mlock_kb",
1096 .data = &sysctl_perf_event_mlock,
1097 .maxlen = sizeof(sysctl_perf_event_mlock),
1099 .proc_handler = proc_dointvec,
1102 .procname = "perf_event_max_sample_rate",
1103 .data = &sysctl_perf_event_sample_rate,
1104 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1106 .proc_handler = perf_proc_update_handler,
1110 .procname = "perf_cpu_time_max_percent",
1111 .data = &sysctl_perf_cpu_time_max_percent,
1112 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1114 .proc_handler = perf_cpu_time_max_percent_handler,
1116 .extra2 = &one_hundred,
1119 #ifdef CONFIG_KMEMCHECK
1121 .procname = "kmemcheck",
1122 .data = &kmemcheck_enabled,
1123 .maxlen = sizeof(int),
1125 .proc_handler = proc_dointvec,
1129 .procname = "panic_on_warn",
1130 .data = &panic_on_warn,
1131 .maxlen = sizeof(int),
1133 .proc_handler = proc_dointvec_minmax,
1140 static struct ctl_table vm_table[] = {
1142 .procname = "overcommit_memory",
1143 .data = &sysctl_overcommit_memory,
1144 .maxlen = sizeof(sysctl_overcommit_memory),
1146 .proc_handler = proc_dointvec_minmax,
1151 .procname = "panic_on_oom",
1152 .data = &sysctl_panic_on_oom,
1153 .maxlen = sizeof(sysctl_panic_on_oom),
1155 .proc_handler = proc_dointvec_minmax,
1160 .procname = "oom_kill_allocating_task",
1161 .data = &sysctl_oom_kill_allocating_task,
1162 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1164 .proc_handler = proc_dointvec,
1167 .procname = "oom_dump_tasks",
1168 .data = &sysctl_oom_dump_tasks,
1169 .maxlen = sizeof(sysctl_oom_dump_tasks),
1171 .proc_handler = proc_dointvec,
1174 .procname = "overcommit_ratio",
1175 .data = &sysctl_overcommit_ratio,
1176 .maxlen = sizeof(sysctl_overcommit_ratio),
1178 .proc_handler = overcommit_ratio_handler,
1181 .procname = "overcommit_kbytes",
1182 .data = &sysctl_overcommit_kbytes,
1183 .maxlen = sizeof(sysctl_overcommit_kbytes),
1185 .proc_handler = overcommit_kbytes_handler,
1188 .procname = "page-cluster",
1189 .data = &page_cluster,
1190 .maxlen = sizeof(int),
1192 .proc_handler = proc_dointvec_minmax,
1196 .procname = "dirty_background_ratio",
1197 .data = &dirty_background_ratio,
1198 .maxlen = sizeof(dirty_background_ratio),
1200 .proc_handler = dirty_background_ratio_handler,
1202 .extra2 = &one_hundred,
1205 .procname = "dirty_background_bytes",
1206 .data = &dirty_background_bytes,
1207 .maxlen = sizeof(dirty_background_bytes),
1209 .proc_handler = dirty_background_bytes_handler,
1213 .procname = "dirty_ratio",
1214 .data = &vm_dirty_ratio,
1215 .maxlen = sizeof(vm_dirty_ratio),
1217 .proc_handler = dirty_ratio_handler,
1219 .extra2 = &one_hundred,
1222 .procname = "dirty_bytes",
1223 .data = &vm_dirty_bytes,
1224 .maxlen = sizeof(vm_dirty_bytes),
1226 .proc_handler = dirty_bytes_handler,
1227 .extra1 = &dirty_bytes_min,
1230 .procname = "dirty_writeback_centisecs",
1231 .data = &dirty_writeback_interval,
1232 .maxlen = sizeof(dirty_writeback_interval),
1234 .proc_handler = dirty_writeback_centisecs_handler,
1237 .procname = "dirty_expire_centisecs",
1238 .data = &dirty_expire_interval,
1239 .maxlen = sizeof(dirty_expire_interval),
1241 .proc_handler = proc_dointvec_minmax,
1245 .procname = "dirtytime_expire_seconds",
1246 .data = &dirtytime_expire_interval,
1247 .maxlen = sizeof(dirty_expire_interval),
1249 .proc_handler = dirtytime_interval_handler,
1253 .procname = "nr_pdflush_threads",
1254 .mode = 0444 /* read-only */,
1255 .proc_handler = pdflush_proc_obsolete,
1258 .procname = "swappiness",
1259 .data = &vm_swappiness,
1260 .maxlen = sizeof(vm_swappiness),
1262 .proc_handler = proc_dointvec_minmax,
1264 .extra2 = &one_hundred,
1266 #ifdef CONFIG_HUGETLB_PAGE
1268 .procname = "nr_hugepages",
1270 .maxlen = sizeof(unsigned long),
1272 .proc_handler = hugetlb_sysctl_handler,
1276 .procname = "nr_hugepages_mempolicy",
1278 .maxlen = sizeof(unsigned long),
1280 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1284 .procname = "hugetlb_shm_group",
1285 .data = &sysctl_hugetlb_shm_group,
1286 .maxlen = sizeof(gid_t),
1288 .proc_handler = proc_dointvec,
1291 .procname = "hugepages_treat_as_movable",
1292 .data = &hugepages_treat_as_movable,
1293 .maxlen = sizeof(int),
1295 .proc_handler = proc_dointvec,
1298 .procname = "nr_overcommit_hugepages",
1300 .maxlen = sizeof(unsigned long),
1302 .proc_handler = hugetlb_overcommit_handler,
1306 .procname = "lowmem_reserve_ratio",
1307 .data = &sysctl_lowmem_reserve_ratio,
1308 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1310 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1313 .procname = "drop_caches",
1314 .data = &sysctl_drop_caches,
1315 .maxlen = sizeof(int),
1317 .proc_handler = drop_caches_sysctl_handler,
1321 #ifdef CONFIG_COMPACTION
1323 .procname = "compact_memory",
1324 .data = &sysctl_compact_memory,
1325 .maxlen = sizeof(int),
1327 .proc_handler = sysctl_compaction_handler,
1330 .procname = "extfrag_threshold",
1331 .data = &sysctl_extfrag_threshold,
1332 .maxlen = sizeof(int),
1334 .proc_handler = sysctl_extfrag_handler,
1335 .extra1 = &min_extfrag_threshold,
1336 .extra2 = &max_extfrag_threshold,
1339 .procname = "compact_unevictable_allowed",
1340 .data = &sysctl_compact_unevictable_allowed,
1341 .maxlen = sizeof(int),
1343 .proc_handler = proc_dointvec,
1348 #endif /* CONFIG_COMPACTION */
1350 .procname = "min_free_kbytes",
1351 .data = &min_free_kbytes,
1352 .maxlen = sizeof(min_free_kbytes),
1354 .proc_handler = min_free_kbytes_sysctl_handler,
1358 .procname = "percpu_pagelist_fraction",
1359 .data = &percpu_pagelist_fraction,
1360 .maxlen = sizeof(percpu_pagelist_fraction),
1362 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1367 .procname = "max_map_count",
1368 .data = &sysctl_max_map_count,
1369 .maxlen = sizeof(sysctl_max_map_count),
1371 .proc_handler = proc_dointvec_minmax,
1376 .procname = "nr_trim_pages",
1377 .data = &sysctl_nr_trim_pages,
1378 .maxlen = sizeof(sysctl_nr_trim_pages),
1380 .proc_handler = proc_dointvec_minmax,
1385 .procname = "laptop_mode",
1386 .data = &laptop_mode,
1387 .maxlen = sizeof(laptop_mode),
1389 .proc_handler = proc_dointvec_jiffies,
1392 .procname = "block_dump",
1393 .data = &block_dump,
1394 .maxlen = sizeof(block_dump),
1396 .proc_handler = proc_dointvec,
1400 .procname = "vfs_cache_pressure",
1401 .data = &sysctl_vfs_cache_pressure,
1402 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1404 .proc_handler = proc_dointvec,
1407 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1409 .procname = "legacy_va_layout",
1410 .data = &sysctl_legacy_va_layout,
1411 .maxlen = sizeof(sysctl_legacy_va_layout),
1413 .proc_handler = proc_dointvec,
1419 .procname = "zone_reclaim_mode",
1420 .data = &zone_reclaim_mode,
1421 .maxlen = sizeof(zone_reclaim_mode),
1423 .proc_handler = proc_dointvec,
1427 .procname = "min_unmapped_ratio",
1428 .data = &sysctl_min_unmapped_ratio,
1429 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1431 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1433 .extra2 = &one_hundred,
1436 .procname = "min_slab_ratio",
1437 .data = &sysctl_min_slab_ratio,
1438 .maxlen = sizeof(sysctl_min_slab_ratio),
1440 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1442 .extra2 = &one_hundred,
1447 .procname = "stat_interval",
1448 .data = &sysctl_stat_interval,
1449 .maxlen = sizeof(sysctl_stat_interval),
1451 .proc_handler = proc_dointvec_jiffies,
1456 .procname = "mmap_min_addr",
1457 .data = &dac_mmap_min_addr,
1458 .maxlen = sizeof(unsigned long),
1460 .proc_handler = mmap_min_addr_handler,
1465 .procname = "numa_zonelist_order",
1466 .data = &numa_zonelist_order,
1467 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1469 .proc_handler = numa_zonelist_order_handler,
1472 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1473 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1475 .procname = "vdso_enabled",
1476 #ifdef CONFIG_X86_32
1477 .data = &vdso32_enabled,
1478 .maxlen = sizeof(vdso32_enabled),
1480 .data = &vdso_enabled,
1481 .maxlen = sizeof(vdso_enabled),
1484 .proc_handler = proc_dointvec,
1488 #ifdef CONFIG_HIGHMEM
1490 .procname = "highmem_is_dirtyable",
1491 .data = &vm_highmem_is_dirtyable,
1492 .maxlen = sizeof(vm_highmem_is_dirtyable),
1494 .proc_handler = proc_dointvec_minmax,
1499 #ifdef CONFIG_MEMORY_FAILURE
1501 .procname = "memory_failure_early_kill",
1502 .data = &sysctl_memory_failure_early_kill,
1503 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1505 .proc_handler = proc_dointvec_minmax,
1510 .procname = "memory_failure_recovery",
1511 .data = &sysctl_memory_failure_recovery,
1512 .maxlen = sizeof(sysctl_memory_failure_recovery),
1514 .proc_handler = proc_dointvec_minmax,
1520 .procname = "user_reserve_kbytes",
1521 .data = &sysctl_user_reserve_kbytes,
1522 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1524 .proc_handler = proc_doulongvec_minmax,
1527 .procname = "admin_reserve_kbytes",
1528 .data = &sysctl_admin_reserve_kbytes,
1529 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1531 .proc_handler = proc_doulongvec_minmax,
1536 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1537 static struct ctl_table binfmt_misc_table[] = {
1542 static struct ctl_table fs_table[] = {
1544 .procname = "inode-nr",
1545 .data = &inodes_stat,
1546 .maxlen = 2*sizeof(long),
1548 .proc_handler = proc_nr_inodes,
1551 .procname = "inode-state",
1552 .data = &inodes_stat,
1553 .maxlen = 7*sizeof(long),
1555 .proc_handler = proc_nr_inodes,
1558 .procname = "file-nr",
1559 .data = &files_stat,
1560 .maxlen = sizeof(files_stat),
1562 .proc_handler = proc_nr_files,
1565 .procname = "file-max",
1566 .data = &files_stat.max_files,
1567 .maxlen = sizeof(files_stat.max_files),
1569 .proc_handler = proc_doulongvec_minmax,
1572 .procname = "nr_open",
1573 .data = &sysctl_nr_open,
1574 .maxlen = sizeof(int),
1576 .proc_handler = proc_dointvec_minmax,
1577 .extra1 = &sysctl_nr_open_min,
1578 .extra2 = &sysctl_nr_open_max,
1581 .procname = "dentry-state",
1582 .data = &dentry_stat,
1583 .maxlen = 6*sizeof(long),
1585 .proc_handler = proc_nr_dentry,
1588 .procname = "overflowuid",
1589 .data = &fs_overflowuid,
1590 .maxlen = sizeof(int),
1592 .proc_handler = proc_dointvec_minmax,
1593 .extra1 = &minolduid,
1594 .extra2 = &maxolduid,
1597 .procname = "overflowgid",
1598 .data = &fs_overflowgid,
1599 .maxlen = sizeof(int),
1601 .proc_handler = proc_dointvec_minmax,
1602 .extra1 = &minolduid,
1603 .extra2 = &maxolduid,
1605 #ifdef CONFIG_FILE_LOCKING
1607 .procname = "leases-enable",
1608 .data = &leases_enable,
1609 .maxlen = sizeof(int),
1611 .proc_handler = proc_dointvec,
1614 #ifdef CONFIG_DNOTIFY
1616 .procname = "dir-notify-enable",
1617 .data = &dir_notify_enable,
1618 .maxlen = sizeof(int),
1620 .proc_handler = proc_dointvec,
1624 #ifdef CONFIG_FILE_LOCKING
1626 .procname = "lease-break-time",
1627 .data = &lease_break_time,
1628 .maxlen = sizeof(int),
1630 .proc_handler = proc_dointvec,
1635 .procname = "aio-nr",
1637 .maxlen = sizeof(aio_nr),
1639 .proc_handler = proc_doulongvec_minmax,
1642 .procname = "aio-max-nr",
1643 .data = &aio_max_nr,
1644 .maxlen = sizeof(aio_max_nr),
1646 .proc_handler = proc_doulongvec_minmax,
1648 #endif /* CONFIG_AIO */
1649 #ifdef CONFIG_INOTIFY_USER
1651 .procname = "inotify",
1653 .child = inotify_table,
1658 .procname = "epoll",
1660 .child = epoll_table,
1665 .procname = "protected_symlinks",
1666 .data = &sysctl_protected_symlinks,
1667 .maxlen = sizeof(int),
1669 .proc_handler = proc_dointvec_minmax,
1674 .procname = "protected_hardlinks",
1675 .data = &sysctl_protected_hardlinks,
1676 .maxlen = sizeof(int),
1678 .proc_handler = proc_dointvec_minmax,
1683 .procname = "suid_dumpable",
1684 .data = &suid_dumpable,
1685 .maxlen = sizeof(int),
1687 .proc_handler = proc_dointvec_minmax_coredump,
1691 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1693 .procname = "binfmt_misc",
1695 .child = binfmt_misc_table,
1699 .procname = "pipe-max-size",
1700 .data = &pipe_max_size,
1701 .maxlen = sizeof(int),
1703 .proc_handler = &pipe_proc_fn,
1704 .extra1 = &pipe_min_size,
1709 static struct ctl_table debug_table[] = {
1710 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1712 .procname = "exception-trace",
1713 .data = &show_unhandled_signals,
1714 .maxlen = sizeof(int),
1716 .proc_handler = proc_dointvec
1719 #if defined(CONFIG_OPTPROBES)
1721 .procname = "kprobes-optimization",
1722 .data = &sysctl_kprobes_optimization,
1723 .maxlen = sizeof(int),
1725 .proc_handler = proc_kprobes_optimization_handler,
1733 static struct ctl_table dev_table[] = {
1737 int __init sysctl_init(void)
1739 struct ctl_table_header *hdr;
1741 hdr = register_sysctl_table(sysctl_base_table);
1742 kmemleak_not_leak(hdr);
1746 #endif /* CONFIG_SYSCTL */
1752 #ifdef CONFIG_PROC_SYSCTL
1754 static int _proc_do_string(char *data, int maxlen, int write,
1755 char __user *buffer,
1756 size_t *lenp, loff_t *ppos)
1762 if (!data || !maxlen || !*lenp) {
1768 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1769 /* Only continue writes not past the end of buffer. */
1771 if (len > maxlen - 1)
1778 /* Start writing from beginning of buffer. */
1784 while ((p - buffer) < *lenp && len < maxlen - 1) {
1785 if (get_user(c, p++))
1787 if (c == 0 || c == '\n')
1808 if (copy_to_user(buffer, data, len))
1811 if (put_user('\n', buffer + len))
1821 static void warn_sysctl_write(struct ctl_table *table)
1823 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1824 "This will not be supported in the future. To silence this\n"
1825 "warning, set kernel.sysctl_writes_strict = -1\n",
1826 current->comm, table->procname);
1830 * proc_dostring - read a string sysctl
1831 * @table: the sysctl table
1832 * @write: %TRUE if this is a write to the sysctl file
1833 * @buffer: the user buffer
1834 * @lenp: the size of the user buffer
1835 * @ppos: file position
1837 * Reads/writes a string from/to the user buffer. If the kernel
1838 * buffer provided is not large enough to hold the string, the
1839 * string is truncated. The copied string is %NULL-terminated.
1840 * If the string is being read by the user process, it is copied
1841 * and a newline '\n' is added. It is truncated if the buffer is
1844 * Returns 0 on success.
1846 int proc_dostring(struct ctl_table *table, int write,
1847 void __user *buffer, size_t *lenp, loff_t *ppos)
1849 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1850 warn_sysctl_write(table);
1852 return _proc_do_string((char *)(table->data), table->maxlen, write,
1853 (char __user *)buffer, lenp, ppos);
1856 static size_t proc_skip_spaces(char **buf)
1859 char *tmp = skip_spaces(*buf);
1865 static void proc_skip_char(char **buf, size_t *size, const char v)
1875 #define TMPBUFLEN 22
1877 * proc_get_long - reads an ASCII formatted integer from a user buffer
1879 * @buf: a kernel buffer
1880 * @size: size of the kernel buffer
1881 * @val: this is where the number will be stored
1882 * @neg: set to %TRUE if number is negative
1883 * @perm_tr: a vector which contains the allowed trailers
1884 * @perm_tr_len: size of the perm_tr vector
1885 * @tr: pointer to store the trailer character
1887 * In case of success %0 is returned and @buf and @size are updated with
1888 * the amount of bytes read. If @tr is non-NULL and a trailing
1889 * character exists (size is non-zero after returning from this
1890 * function), @tr is updated with the trailing character.
1892 static int proc_get_long(char **buf, size_t *size,
1893 unsigned long *val, bool *neg,
1894 const char *perm_tr, unsigned perm_tr_len, char *tr)
1897 char *p, tmp[TMPBUFLEN];
1903 if (len > TMPBUFLEN - 1)
1904 len = TMPBUFLEN - 1;
1906 memcpy(tmp, *buf, len);
1910 if (*p == '-' && *size > 1) {
1918 *val = simple_strtoul(p, &p, 0);
1922 /* We don't know if the next char is whitespace thus we may accept
1923 * invalid integers (e.g. 1234...a) or two integers instead of one
1924 * (e.g. 123...1). So lets not allow such large numbers. */
1925 if (len == TMPBUFLEN - 1)
1928 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1931 if (tr && (len < *size))
1941 * proc_put_long - converts an integer to a decimal ASCII formatted string
1943 * @buf: the user buffer
1944 * @size: the size of the user buffer
1945 * @val: the integer to be converted
1946 * @neg: sign of the number, %TRUE for negative
1948 * In case of success %0 is returned and @buf and @size are updated with
1949 * the amount of bytes written.
1951 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1955 char tmp[TMPBUFLEN], *p = tmp;
1957 sprintf(p, "%s%lu", neg ? "-" : "", val);
1961 if (copy_to_user(*buf, tmp, len))
1969 static int proc_put_char(void __user **buf, size_t *size, char c)
1972 char __user **buffer = (char __user **)buf;
1973 if (put_user(c, *buffer))
1975 (*size)--, (*buffer)++;
1981 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1983 int write, void *data)
1986 *valp = *negp ? -*lvalp : *lvalp;
1991 *lvalp = (unsigned long)-val;
1994 *lvalp = (unsigned long)val;
2000 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2002 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2003 int write, void __user *buffer,
2004 size_t *lenp, loff_t *ppos,
2005 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2006 int write, void *data),
2009 int *i, vleft, first = 1, err = 0;
2010 unsigned long page = 0;
2014 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2019 i = (int *) tbl_data;
2020 vleft = table->maxlen / sizeof(*i);
2024 conv = do_proc_dointvec_conv;
2028 switch (sysctl_writes_strict) {
2029 case SYSCTL_WRITES_STRICT:
2031 case SYSCTL_WRITES_WARN:
2032 warn_sysctl_write(table);
2039 if (left > PAGE_SIZE - 1)
2040 left = PAGE_SIZE - 1;
2041 page = __get_free_page(GFP_TEMPORARY);
2042 kbuf = (char *) page;
2045 if (copy_from_user(kbuf, buffer, left)) {
2052 for (; left && vleft--; i++, first=0) {
2057 left -= proc_skip_spaces(&kbuf);
2061 err = proc_get_long(&kbuf, &left, &lval, &neg,
2063 sizeof(proc_wspace_sep), NULL);
2066 if (conv(&neg, &lval, i, 1, data)) {
2071 if (conv(&neg, &lval, i, 0, data)) {
2076 err = proc_put_char(&buffer, &left, '\t');
2079 err = proc_put_long(&buffer, &left, lval, neg);
2085 if (!write && !first && left && !err)
2086 err = proc_put_char(&buffer, &left, '\n');
2087 if (write && !err && left)
2088 left -= proc_skip_spaces(&kbuf);
2093 return err ? : -EINVAL;
2101 static int do_proc_dointvec(struct ctl_table *table, int write,
2102 void __user *buffer, size_t *lenp, loff_t *ppos,
2103 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2104 int write, void *data),
2107 return __do_proc_dointvec(table->data, table, write,
2108 buffer, lenp, ppos, conv, data);
2112 * proc_dointvec - read a vector of integers
2113 * @table: the sysctl table
2114 * @write: %TRUE if this is a write to the sysctl file
2115 * @buffer: the user buffer
2116 * @lenp: the size of the user buffer
2117 * @ppos: file position
2119 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2120 * values from/to the user buffer, treated as an ASCII string.
2122 * Returns 0 on success.
2124 int proc_dointvec(struct ctl_table *table, int write,
2125 void __user *buffer, size_t *lenp, loff_t *ppos)
2127 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2132 * Taint values can only be increased
2133 * This means we can safely use a temporary.
2135 static int proc_taint(struct ctl_table *table, int write,
2136 void __user *buffer, size_t *lenp, loff_t *ppos)
2139 unsigned long tmptaint = get_taint();
2142 if (write && !capable(CAP_SYS_ADMIN))
2147 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2153 * Poor man's atomic or. Not worth adding a primitive
2154 * to everyone's atomic.h for this
2157 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2158 if ((tmptaint >> i) & 1)
2159 add_taint(i, LOCKDEP_STILL_OK);
2166 #ifdef CONFIG_PRINTK
2167 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2168 void __user *buffer, size_t *lenp, loff_t *ppos)
2170 if (write && !capable(CAP_SYS_ADMIN))
2173 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2177 struct do_proc_dointvec_minmax_conv_param {
2182 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2184 int write, void *data)
2186 struct do_proc_dointvec_minmax_conv_param *param = data;
2188 int val = *negp ? -*lvalp : *lvalp;
2189 if ((param->min && *param->min > val) ||
2190 (param->max && *param->max < val))
2197 *lvalp = (unsigned long)-val;
2200 *lvalp = (unsigned long)val;
2207 * proc_dointvec_minmax - read a vector of integers with min/max values
2208 * @table: the sysctl table
2209 * @write: %TRUE if this is a write to the sysctl file
2210 * @buffer: the user buffer
2211 * @lenp: the size of the user buffer
2212 * @ppos: file position
2214 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2215 * values from/to the user buffer, treated as an ASCII string.
2217 * This routine will ensure the values are within the range specified by
2218 * table->extra1 (min) and table->extra2 (max).
2220 * Returns 0 on success.
2222 int proc_dointvec_minmax(struct ctl_table *table, int write,
2223 void __user *buffer, size_t *lenp, loff_t *ppos)
2225 struct do_proc_dointvec_minmax_conv_param param = {
2226 .min = (int *) table->extra1,
2227 .max = (int *) table->extra2,
2229 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2230 do_proc_dointvec_minmax_conv, ¶m);
2233 static void validate_coredump_safety(void)
2235 #ifdef CONFIG_COREDUMP
2236 if (suid_dumpable == SUID_DUMP_ROOT &&
2237 core_pattern[0] != '/' && core_pattern[0] != '|') {
2238 printk(KERN_WARNING "Unsafe core_pattern used with "\
2239 "suid_dumpable=2. Pipe handler or fully qualified "\
2240 "core dump path required.\n");
2245 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2246 void __user *buffer, size_t *lenp, loff_t *ppos)
2248 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2250 validate_coredump_safety();
2254 #ifdef CONFIG_COREDUMP
2255 static int proc_dostring_coredump(struct ctl_table *table, int write,
2256 void __user *buffer, size_t *lenp, loff_t *ppos)
2258 int error = proc_dostring(table, write, buffer, lenp, ppos);
2260 validate_coredump_safety();
2265 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2266 void __user *buffer,
2267 size_t *lenp, loff_t *ppos,
2268 unsigned long convmul,
2269 unsigned long convdiv)
2271 unsigned long *i, *min, *max;
2272 int vleft, first = 1, err = 0;
2273 unsigned long page = 0;
2277 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2282 i = (unsigned long *) data;
2283 min = (unsigned long *) table->extra1;
2284 max = (unsigned long *) table->extra2;
2285 vleft = table->maxlen / sizeof(unsigned long);
2290 switch (sysctl_writes_strict) {
2291 case SYSCTL_WRITES_STRICT:
2293 case SYSCTL_WRITES_WARN:
2294 warn_sysctl_write(table);
2301 if (left > PAGE_SIZE - 1)
2302 left = PAGE_SIZE - 1;
2303 page = __get_free_page(GFP_TEMPORARY);
2304 kbuf = (char *) page;
2307 if (copy_from_user(kbuf, buffer, left)) {
2314 for (; left && vleft--; i++, first = 0) {
2320 left -= proc_skip_spaces(&kbuf);
2322 err = proc_get_long(&kbuf, &left, &val, &neg,
2324 sizeof(proc_wspace_sep), NULL);
2329 if ((min && val < *min) || (max && val > *max))
2333 val = convdiv * (*i) / convmul;
2335 err = proc_put_char(&buffer, &left, '\t');
2339 err = proc_put_long(&buffer, &left, val, false);
2345 if (!write && !first && left && !err)
2346 err = proc_put_char(&buffer, &left, '\n');
2348 left -= proc_skip_spaces(&kbuf);
2353 return err ? : -EINVAL;
2361 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2362 void __user *buffer,
2363 size_t *lenp, loff_t *ppos,
2364 unsigned long convmul,
2365 unsigned long convdiv)
2367 return __do_proc_doulongvec_minmax(table->data, table, write,
2368 buffer, lenp, ppos, convmul, convdiv);
2372 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2373 * @table: the sysctl table
2374 * @write: %TRUE if this is a write to the sysctl file
2375 * @buffer: the user buffer
2376 * @lenp: the size of the user buffer
2377 * @ppos: file position
2379 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2380 * values from/to the user buffer, treated as an ASCII string.
2382 * This routine will ensure the values are within the range specified by
2383 * table->extra1 (min) and table->extra2 (max).
2385 * Returns 0 on success.
2387 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2388 void __user *buffer, size_t *lenp, loff_t *ppos)
2390 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2394 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2395 * @table: the sysctl table
2396 * @write: %TRUE if this is a write to the sysctl file
2397 * @buffer: the user buffer
2398 * @lenp: the size of the user buffer
2399 * @ppos: file position
2401 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2402 * values from/to the user buffer, treated as an ASCII string. The values
2403 * are treated as milliseconds, and converted to jiffies when they are stored.
2405 * This routine will ensure the values are within the range specified by
2406 * table->extra1 (min) and table->extra2 (max).
2408 * Returns 0 on success.
2410 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2411 void __user *buffer,
2412 size_t *lenp, loff_t *ppos)
2414 return do_proc_doulongvec_minmax(table, write, buffer,
2415 lenp, ppos, HZ, 1000l);
2419 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2421 int write, void *data)
2424 if (*lvalp > LONG_MAX / HZ)
2426 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2432 lval = (unsigned long)-val;
2435 lval = (unsigned long)val;
2442 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2444 int write, void *data)
2447 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2449 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2455 lval = (unsigned long)-val;
2458 lval = (unsigned long)val;
2460 *lvalp = jiffies_to_clock_t(lval);
2465 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2467 int write, void *data)
2470 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2480 lval = (unsigned long)-val;
2483 lval = (unsigned long)val;
2485 *lvalp = jiffies_to_msecs(lval);
2491 * proc_dointvec_jiffies - read a vector of integers as seconds
2492 * @table: the sysctl table
2493 * @write: %TRUE if this is a write to the sysctl file
2494 * @buffer: the user buffer
2495 * @lenp: the size of the user buffer
2496 * @ppos: file position
2498 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2499 * values from/to the user buffer, treated as an ASCII string.
2500 * The values read are assumed to be in seconds, and are converted into
2503 * Returns 0 on success.
2505 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2506 void __user *buffer, size_t *lenp, loff_t *ppos)
2508 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2509 do_proc_dointvec_jiffies_conv,NULL);
2513 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2514 * @table: the sysctl table
2515 * @write: %TRUE if this is a write to the sysctl file
2516 * @buffer: the user buffer
2517 * @lenp: the size of the user buffer
2518 * @ppos: pointer to the file position
2520 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2521 * values from/to the user buffer, treated as an ASCII string.
2522 * The values read are assumed to be in 1/USER_HZ seconds, and
2523 * are converted into jiffies.
2525 * Returns 0 on success.
2527 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos)
2530 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2531 do_proc_dointvec_userhz_jiffies_conv,NULL);
2535 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2536 * @table: the sysctl table
2537 * @write: %TRUE if this is a write to the sysctl file
2538 * @buffer: the user buffer
2539 * @lenp: the size of the user buffer
2540 * @ppos: file position
2541 * @ppos: the current position in the file
2543 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2544 * values from/to the user buffer, treated as an ASCII string.
2545 * The values read are assumed to be in 1/1000 seconds, and
2546 * are converted into jiffies.
2548 * Returns 0 on success.
2550 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2551 void __user *buffer, size_t *lenp, loff_t *ppos)
2553 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2554 do_proc_dointvec_ms_jiffies_conv, NULL);
2557 static int proc_do_cad_pid(struct ctl_table *table, int write,
2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2560 struct pid *new_pid;
2564 tmp = pid_vnr(cad_pid);
2566 r = __do_proc_dointvec(&tmp, table, write, buffer,
2567 lenp, ppos, NULL, NULL);
2571 new_pid = find_get_pid(tmp);
2575 put_pid(xchg(&cad_pid, new_pid));
2580 * proc_do_large_bitmap - read/write from/to a large bitmap
2581 * @table: the sysctl table
2582 * @write: %TRUE if this is a write to the sysctl file
2583 * @buffer: the user buffer
2584 * @lenp: the size of the user buffer
2585 * @ppos: file position
2587 * The bitmap is stored at table->data and the bitmap length (in bits)
2590 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2591 * large bitmaps may be represented in a compact manner. Writing into
2592 * the file will clear the bitmap then update it with the given input.
2594 * Returns 0 on success.
2596 int proc_do_large_bitmap(struct ctl_table *table, int write,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2601 size_t left = *lenp;
2602 unsigned long bitmap_len = table->maxlen;
2603 unsigned long *bitmap = *(unsigned long **) table->data;
2604 unsigned long *tmp_bitmap = NULL;
2605 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2607 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2613 unsigned long page = 0;
2616 if (left > PAGE_SIZE - 1)
2617 left = PAGE_SIZE - 1;
2619 page = __get_free_page(GFP_TEMPORARY);
2620 kbuf = (char *) page;
2623 if (copy_from_user(kbuf, buffer, left)) {
2629 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2635 proc_skip_char(&kbuf, &left, '\n');
2636 while (!err && left) {
2637 unsigned long val_a, val_b;
2640 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2644 if (val_a >= bitmap_len || neg) {
2656 err = proc_get_long(&kbuf, &left, &val_b,
2657 &neg, tr_b, sizeof(tr_b),
2661 if (val_b >= bitmap_len || neg ||
2672 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2674 proc_skip_char(&kbuf, &left, '\n');
2678 unsigned long bit_a, bit_b = 0;
2681 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2682 if (bit_a >= bitmap_len)
2684 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2688 err = proc_put_char(&buffer, &left, ',');
2692 err = proc_put_long(&buffer, &left, bit_a, false);
2695 if (bit_a != bit_b) {
2696 err = proc_put_char(&buffer, &left, '-');
2699 err = proc_put_long(&buffer, &left, bit_b, false);
2707 err = proc_put_char(&buffer, &left, '\n');
2713 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2715 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2727 #else /* CONFIG_PROC_SYSCTL */
2729 int proc_dostring(struct ctl_table *table, int write,
2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2735 int proc_dointvec(struct ctl_table *table, int write,
2736 void __user *buffer, size_t *lenp, loff_t *ppos)
2741 int proc_dointvec_minmax(struct ctl_table *table, int write,
2742 void __user *buffer, size_t *lenp, loff_t *ppos)
2747 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2748 void __user *buffer, size_t *lenp, loff_t *ppos)
2753 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2754 void __user *buffer, size_t *lenp, loff_t *ppos)
2759 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2760 void __user *buffer, size_t *lenp, loff_t *ppos)
2765 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2766 void __user *buffer, size_t *lenp, loff_t *ppos)
2771 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2772 void __user *buffer,
2773 size_t *lenp, loff_t *ppos)
2779 #endif /* CONFIG_PROC_SYSCTL */
2782 * No sense putting this after each symbol definition, twice,
2783 * exception granted :-)
2785 EXPORT_SYMBOL(proc_dointvec);
2786 EXPORT_SYMBOL(proc_dointvec_jiffies);
2787 EXPORT_SYMBOL(proc_dointvec_minmax);
2788 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2789 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2790 EXPORT_SYMBOL(proc_dostring);
2791 EXPORT_SYMBOL(proc_doulongvec_minmax);
2792 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);