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 extern int blk_iopoll_enabled;
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty = 60;
124 static int __maybe_unused neg_one = -1;
127 static int __maybe_unused one = 1;
128 static int __maybe_unused two = 2;
129 static int __maybe_unused three = 3;
130 static unsigned long one_ul = 1;
131 static int one_hundred = 100;
133 static int ten_thousand = 10000;
136 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
137 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
139 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
140 static int maxolduid = 65535;
141 static int minolduid;
142 static int min_percpu_pagelist_fract = 8;
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
148 #ifdef CONFIG_DETECT_HUNG_TASK
149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
152 #ifdef CONFIG_INOTIFY_USER
153 #include <linux/inotify.h>
158 #ifdef CONFIG_SPARC64
159 extern int sysctl_tsb_ratio;
163 extern int pwrsw_enabled;
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
167 extern int unaligned_enabled;
171 extern int unaligned_dump_stack;
174 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
175 extern int no_unaligned_warning;
178 #ifdef CONFIG_PROC_SYSCTL
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(ctl_table *table, int write,
202 void __user *buffer, size_t *lenp,
207 error = proc_dointvec(table, write, buffer, lenp, ppos);
212 sysrq_toggle_support(__sysrq_enabled);
219 static struct ctl_table kern_table[];
220 static struct ctl_table vm_table[];
221 static struct ctl_table fs_table[];
222 static struct ctl_table debug_table[];
223 static struct ctl_table dev_table[];
224 extern struct ctl_table random_table[];
226 extern struct ctl_table epoll_table[];
229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
230 int sysctl_legacy_va_layout;
233 /* The default sysctl tables: */
235 static struct ctl_table sysctl_base_table[] = {
237 .procname = "kernel",
254 .child = debug_table,
264 #ifdef CONFIG_SCHED_DEBUG
265 static int min_sched_granularity_ns = 100000; /* 100 usecs */
266 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 static int min_wakeup_granularity_ns; /* 0 usecs */
268 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
272 #endif /* CONFIG_SMP */
273 #endif /* CONFIG_SCHED_DEBUG */
275 #ifdef CONFIG_COMPACTION
276 static int min_extfrag_threshold;
277 static int max_extfrag_threshold = 1000;
280 static struct ctl_table kern_table[] = {
282 .procname = "sched_child_runs_first",
283 .data = &sysctl_sched_child_runs_first,
284 .maxlen = sizeof(unsigned int),
286 .proc_handler = proc_dointvec,
288 #ifdef CONFIG_SCHED_DEBUG
290 .procname = "sched_min_granularity_ns",
291 .data = &sysctl_sched_min_granularity,
292 .maxlen = sizeof(unsigned int),
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
299 .procname = "sched_latency_ns",
300 .data = &sysctl_sched_latency,
301 .maxlen = sizeof(unsigned int),
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_sched_granularity_ns,
305 .extra2 = &max_sched_granularity_ns,
308 .procname = "sched_wakeup_granularity_ns",
309 .data = &sysctl_sched_wakeup_granularity,
310 .maxlen = sizeof(unsigned int),
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_wakeup_granularity_ns,
314 .extra2 = &max_wakeup_granularity_ns,
318 .procname = "sched_tunable_scaling",
319 .data = &sysctl_sched_tunable_scaling,
320 .maxlen = sizeof(enum sched_tunable_scaling),
322 .proc_handler = sched_proc_update_handler,
323 .extra1 = &min_sched_tunable_scaling,
324 .extra2 = &max_sched_tunable_scaling,
327 .procname = "sched_migration_cost_ns",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
331 .proc_handler = proc_dointvec,
334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
338 .proc_handler = proc_dointvec,
341 .procname = "sched_time_avg_ms",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
345 .proc_handler = proc_dointvec,
348 .procname = "sched_shares_window_ns",
349 .data = &sysctl_sched_shares_window,
350 .maxlen = sizeof(unsigned int),
352 .proc_handler = proc_dointvec,
355 .procname = "timer_migration",
356 .data = &sysctl_timer_migration,
357 .maxlen = sizeof(unsigned int),
359 .proc_handler = proc_dointvec_minmax,
363 #endif /* CONFIG_SMP */
364 #ifdef CONFIG_NUMA_BALANCING
366 .procname = "numa_balancing_scan_delay_ms",
367 .data = &sysctl_numa_balancing_scan_delay,
368 .maxlen = sizeof(unsigned int),
370 .proc_handler = proc_dointvec,
373 .procname = "numa_balancing_scan_period_min_ms",
374 .data = &sysctl_numa_balancing_scan_period_min,
375 .maxlen = sizeof(unsigned int),
377 .proc_handler = proc_dointvec,
380 .procname = "numa_balancing_scan_period_max_ms",
381 .data = &sysctl_numa_balancing_scan_period_max,
382 .maxlen = sizeof(unsigned int),
384 .proc_handler = proc_dointvec,
387 .procname = "numa_balancing_scan_size_mb",
388 .data = &sysctl_numa_balancing_scan_size,
389 .maxlen = sizeof(unsigned int),
391 .proc_handler = proc_dointvec,
394 .procname = "numa_balancing_migrate_deferred",
395 .data = &sysctl_numa_balancing_migrate_deferred,
396 .maxlen = sizeof(unsigned int),
398 .proc_handler = proc_dointvec,
401 .procname = "numa_balancing",
402 .data = NULL, /* filled in by handler */
403 .maxlen = sizeof(unsigned int),
405 .proc_handler = sysctl_numa_balancing,
409 #endif /* CONFIG_NUMA_BALANCING */
410 #endif /* CONFIG_SCHED_DEBUG */
412 .procname = "sched_rt_period_us",
413 .data = &sysctl_sched_rt_period,
414 .maxlen = sizeof(unsigned int),
416 .proc_handler = sched_rt_handler,
419 .procname = "sched_rt_runtime_us",
420 .data = &sysctl_sched_rt_runtime,
421 .maxlen = sizeof(int),
423 .proc_handler = sched_rt_handler,
426 .procname = "sched_rr_timeslice_ms",
427 .data = &sched_rr_timeslice,
428 .maxlen = sizeof(int),
430 .proc_handler = sched_rr_handler,
432 #ifdef CONFIG_SCHED_AUTOGROUP
434 .procname = "sched_autogroup_enabled",
435 .data = &sysctl_sched_autogroup_enabled,
436 .maxlen = sizeof(unsigned int),
438 .proc_handler = proc_dointvec_minmax,
443 #ifdef CONFIG_CFS_BANDWIDTH
445 .procname = "sched_cfs_bandwidth_slice_us",
446 .data = &sysctl_sched_cfs_bandwidth_slice,
447 .maxlen = sizeof(unsigned int),
449 .proc_handler = proc_dointvec_minmax,
453 #ifdef CONFIG_PROVE_LOCKING
455 .procname = "prove_locking",
456 .data = &prove_locking,
457 .maxlen = sizeof(int),
459 .proc_handler = proc_dointvec,
462 #ifdef CONFIG_LOCK_STAT
464 .procname = "lock_stat",
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec,
473 .data = &panic_timeout,
474 .maxlen = sizeof(int),
476 .proc_handler = proc_dointvec,
478 #ifdef CONFIG_COREDUMP
480 .procname = "core_uses_pid",
481 .data = &core_uses_pid,
482 .maxlen = sizeof(int),
484 .proc_handler = proc_dointvec,
487 .procname = "core_pattern",
488 .data = core_pattern,
489 .maxlen = CORENAME_MAX_SIZE,
491 .proc_handler = proc_dostring_coredump,
494 .procname = "core_pipe_limit",
495 .data = &core_pipe_limit,
496 .maxlen = sizeof(unsigned int),
498 .proc_handler = proc_dointvec,
501 #ifdef CONFIG_PROC_SYSCTL
503 .procname = "tainted",
504 .maxlen = sizeof(long),
506 .proc_handler = proc_taint,
509 #ifdef CONFIG_LATENCYTOP
511 .procname = "latencytop",
512 .data = &latencytop_enabled,
513 .maxlen = sizeof(int),
515 .proc_handler = proc_dointvec,
518 #ifdef CONFIG_BLK_DEV_INITRD
520 .procname = "real-root-dev",
521 .data = &real_root_dev,
522 .maxlen = sizeof(int),
524 .proc_handler = proc_dointvec,
528 .procname = "print-fatal-signals",
529 .data = &print_fatal_signals,
530 .maxlen = sizeof(int),
532 .proc_handler = proc_dointvec,
536 .procname = "reboot-cmd",
537 .data = reboot_command,
540 .proc_handler = proc_dostring,
543 .procname = "stop-a",
544 .data = &stop_a_enabled,
545 .maxlen = sizeof (int),
547 .proc_handler = proc_dointvec,
550 .procname = "scons-poweroff",
551 .data = &scons_pwroff,
552 .maxlen = sizeof (int),
554 .proc_handler = proc_dointvec,
557 #ifdef CONFIG_SPARC64
559 .procname = "tsb-ratio",
560 .data = &sysctl_tsb_ratio,
561 .maxlen = sizeof (int),
563 .proc_handler = proc_dointvec,
568 .procname = "soft-power",
569 .data = &pwrsw_enabled,
570 .maxlen = sizeof (int),
572 .proc_handler = proc_dointvec,
575 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
577 .procname = "unaligned-trap",
578 .data = &unaligned_enabled,
579 .maxlen = sizeof (int),
581 .proc_handler = proc_dointvec,
585 .procname = "ctrl-alt-del",
587 .maxlen = sizeof(int),
589 .proc_handler = proc_dointvec,
591 #ifdef CONFIG_FUNCTION_TRACER
593 .procname = "ftrace_enabled",
594 .data = &ftrace_enabled,
595 .maxlen = sizeof(int),
597 .proc_handler = ftrace_enable_sysctl,
600 #ifdef CONFIG_STACK_TRACER
602 .procname = "stack_tracer_enabled",
603 .data = &stack_tracer_enabled,
604 .maxlen = sizeof(int),
606 .proc_handler = stack_trace_sysctl,
609 #ifdef CONFIG_TRACING
611 .procname = "ftrace_dump_on_oops",
612 .data = &ftrace_dump_on_oops,
613 .maxlen = sizeof(int),
615 .proc_handler = proc_dointvec,
618 .procname = "traceoff_on_warning",
619 .data = &__disable_trace_on_warning,
620 .maxlen = sizeof(__disable_trace_on_warning),
622 .proc_handler = proc_dointvec,
627 .procname = "kexec_load_disabled",
628 .data = &kexec_load_disabled,
629 .maxlen = sizeof(int),
631 /* only handle a transition from default "0" to "1" */
632 .proc_handler = proc_dointvec_minmax,
637 #ifdef CONFIG_MODULES
639 .procname = "modprobe",
640 .data = &modprobe_path,
641 .maxlen = KMOD_PATH_LEN,
643 .proc_handler = proc_dostring,
646 .procname = "modules_disabled",
647 .data = &modules_disabled,
648 .maxlen = sizeof(int),
650 /* only handle a transition from default "0" to "1" */
651 .proc_handler = proc_dointvec_minmax,
658 .procname = "hotplug",
659 .data = &uevent_helper,
660 .maxlen = UEVENT_HELPER_PATH_LEN,
662 .proc_handler = proc_dostring,
665 #ifdef CONFIG_CHR_DEV_SG
667 .procname = "sg-big-buff",
668 .data = &sg_big_buff,
669 .maxlen = sizeof (int),
671 .proc_handler = proc_dointvec,
674 #ifdef CONFIG_BSD_PROCESS_ACCT
678 .maxlen = 3*sizeof(int),
680 .proc_handler = proc_dointvec,
683 #ifdef CONFIG_MAGIC_SYSRQ
686 .data = &__sysrq_enabled,
687 .maxlen = sizeof (int),
689 .proc_handler = sysrq_sysctl_handler,
692 #ifdef CONFIG_PROC_SYSCTL
694 .procname = "cad_pid",
696 .maxlen = sizeof (int),
698 .proc_handler = proc_do_cad_pid,
702 .procname = "threads-max",
703 .data = &max_threads,
704 .maxlen = sizeof(int),
706 .proc_handler = proc_dointvec,
709 .procname = "random",
711 .child = random_table,
714 .procname = "usermodehelper",
716 .child = usermodehelper_table,
719 .procname = "overflowuid",
720 .data = &overflowuid,
721 .maxlen = sizeof(int),
723 .proc_handler = proc_dointvec_minmax,
724 .extra1 = &minolduid,
725 .extra2 = &maxolduid,
728 .procname = "overflowgid",
729 .data = &overflowgid,
730 .maxlen = sizeof(int),
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &minolduid,
734 .extra2 = &maxolduid,
737 #ifdef CONFIG_MATHEMU
739 .procname = "ieee_emulation_warnings",
740 .data = &sysctl_ieee_emulation_warnings,
741 .maxlen = sizeof(int),
743 .proc_handler = proc_dointvec,
747 .procname = "userprocess_debug",
748 .data = &show_unhandled_signals,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec,
755 .procname = "pid_max",
757 .maxlen = sizeof (int),
759 .proc_handler = proc_dointvec_minmax,
760 .extra1 = &pid_max_min,
761 .extra2 = &pid_max_max,
764 .procname = "panic_on_oops",
765 .data = &panic_on_oops,
766 .maxlen = sizeof(int),
768 .proc_handler = proc_dointvec,
770 #if defined CONFIG_PRINTK
772 .procname = "printk",
773 .data = &console_loglevel,
774 .maxlen = 4*sizeof(int),
776 .proc_handler = proc_dointvec,
779 .procname = "printk_ratelimit",
780 .data = &printk_ratelimit_state.interval,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_dointvec_jiffies,
786 .procname = "printk_ratelimit_burst",
787 .data = &printk_ratelimit_state.burst,
788 .maxlen = sizeof(int),
790 .proc_handler = proc_dointvec,
793 .procname = "printk_delay",
794 .data = &printk_delay_msec,
795 .maxlen = sizeof(int),
797 .proc_handler = proc_dointvec_minmax,
799 .extra2 = &ten_thousand,
802 .procname = "dmesg_restrict",
803 .data = &dmesg_restrict,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec_minmax_sysadmin,
811 .procname = "kptr_restrict",
812 .data = &kptr_restrict,
813 .maxlen = sizeof(int),
815 .proc_handler = proc_dointvec_minmax_sysadmin,
821 .procname = "ngroups_max",
822 .data = &ngroups_max,
823 .maxlen = sizeof (int),
825 .proc_handler = proc_dointvec,
828 .procname = "cap_last_cap",
829 .data = (void *)&cap_last_cap,
830 .maxlen = sizeof(int),
832 .proc_handler = proc_dointvec,
834 #if defined(CONFIG_LOCKUP_DETECTOR)
836 .procname = "watchdog",
837 .data = &watchdog_user_enabled,
838 .maxlen = sizeof (int),
840 .proc_handler = proc_dowatchdog,
845 .procname = "watchdog_thresh",
846 .data = &watchdog_thresh,
847 .maxlen = sizeof(int),
849 .proc_handler = proc_dowatchdog,
854 .procname = "softlockup_panic",
855 .data = &softlockup_panic,
856 .maxlen = sizeof(int),
858 .proc_handler = proc_dointvec_minmax,
863 .procname = "nmi_watchdog",
864 .data = &watchdog_user_enabled,
865 .maxlen = sizeof (int),
867 .proc_handler = proc_dowatchdog,
872 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
874 .procname = "unknown_nmi_panic",
875 .data = &unknown_nmi_panic,
876 .maxlen = sizeof (int),
878 .proc_handler = proc_dointvec,
881 #if defined(CONFIG_X86)
883 .procname = "panic_on_unrecovered_nmi",
884 .data = &panic_on_unrecovered_nmi,
885 .maxlen = sizeof(int),
887 .proc_handler = proc_dointvec,
890 .procname = "panic_on_io_nmi",
891 .data = &panic_on_io_nmi,
892 .maxlen = sizeof(int),
894 .proc_handler = proc_dointvec,
896 #ifdef CONFIG_DEBUG_STACKOVERFLOW
898 .procname = "panic_on_stackoverflow",
899 .data = &sysctl_panic_on_stackoverflow,
900 .maxlen = sizeof(int),
902 .proc_handler = proc_dointvec,
906 .procname = "bootloader_type",
907 .data = &bootloader_type,
908 .maxlen = sizeof (int),
910 .proc_handler = proc_dointvec,
913 .procname = "bootloader_version",
914 .data = &bootloader_version,
915 .maxlen = sizeof (int),
917 .proc_handler = proc_dointvec,
920 .procname = "kstack_depth_to_print",
921 .data = &kstack_depth_to_print,
922 .maxlen = sizeof(int),
924 .proc_handler = proc_dointvec,
927 .procname = "io_delay_type",
928 .data = &io_delay_type,
929 .maxlen = sizeof(int),
931 .proc_handler = proc_dointvec,
934 #if defined(CONFIG_MMU)
936 .procname = "randomize_va_space",
937 .data = &randomize_va_space,
938 .maxlen = sizeof(int),
940 .proc_handler = proc_dointvec,
943 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
945 .procname = "spin_retry",
947 .maxlen = sizeof (int),
949 .proc_handler = proc_dointvec,
952 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
954 .procname = "acpi_video_flags",
955 .data = &acpi_realmode_flags,
956 .maxlen = sizeof (unsigned long),
958 .proc_handler = proc_doulongvec_minmax,
961 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
963 .procname = "ignore-unaligned-usertrap",
964 .data = &no_unaligned_warning,
965 .maxlen = sizeof (int),
967 .proc_handler = proc_dointvec,
972 .procname = "unaligned-dump-stack",
973 .data = &unaligned_dump_stack,
974 .maxlen = sizeof (int),
976 .proc_handler = proc_dointvec,
979 #ifdef CONFIG_DETECT_HUNG_TASK
981 .procname = "hung_task_panic",
982 .data = &sysctl_hung_task_panic,
983 .maxlen = sizeof(int),
985 .proc_handler = proc_dointvec_minmax,
990 .procname = "hung_task_check_count",
991 .data = &sysctl_hung_task_check_count,
992 .maxlen = sizeof(int),
994 .proc_handler = proc_dointvec_minmax,
998 .procname = "hung_task_timeout_secs",
999 .data = &sysctl_hung_task_timeout_secs,
1000 .maxlen = sizeof(unsigned long),
1002 .proc_handler = proc_dohung_task_timeout_secs,
1003 .extra2 = &hung_task_timeout_max,
1006 .procname = "hung_task_warnings",
1007 .data = &sysctl_hung_task_warnings,
1008 .maxlen = sizeof(int),
1010 .proc_handler = proc_dointvec_minmax,
1014 #ifdef CONFIG_COMPAT
1016 .procname = "compat-log",
1017 .data = &compat_log,
1018 .maxlen = sizeof (int),
1020 .proc_handler = proc_dointvec,
1023 #ifdef CONFIG_RT_MUTEXES
1025 .procname = "max_lock_depth",
1026 .data = &max_lock_depth,
1027 .maxlen = sizeof(int),
1029 .proc_handler = proc_dointvec,
1033 .procname = "poweroff_cmd",
1034 .data = &poweroff_cmd,
1035 .maxlen = POWEROFF_CMD_PATH_LEN,
1037 .proc_handler = proc_dostring,
1043 .child = key_sysctls,
1046 #ifdef CONFIG_RCU_TORTURE_TEST
1048 .procname = "rcutorture_runnable",
1049 .data = &rcutorture_runnable,
1050 .maxlen = sizeof(int),
1052 .proc_handler = proc_dointvec,
1055 #ifdef CONFIG_PERF_EVENTS
1057 * User-space scripts rely on the existence of this file
1058 * as a feature check for perf_events being enabled.
1060 * So it's an ABI, do not remove!
1063 .procname = "perf_event_paranoid",
1064 .data = &sysctl_perf_event_paranoid,
1065 .maxlen = sizeof(sysctl_perf_event_paranoid),
1067 .proc_handler = proc_dointvec,
1070 .procname = "perf_event_mlock_kb",
1071 .data = &sysctl_perf_event_mlock,
1072 .maxlen = sizeof(sysctl_perf_event_mlock),
1074 .proc_handler = proc_dointvec,
1077 .procname = "perf_event_max_sample_rate",
1078 .data = &sysctl_perf_event_sample_rate,
1079 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1081 .proc_handler = perf_proc_update_handler,
1085 .procname = "perf_cpu_time_max_percent",
1086 .data = &sysctl_perf_cpu_time_max_percent,
1087 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1089 .proc_handler = perf_cpu_time_max_percent_handler,
1091 .extra2 = &one_hundred,
1094 #ifdef CONFIG_KMEMCHECK
1096 .procname = "kmemcheck",
1097 .data = &kmemcheck_enabled,
1098 .maxlen = sizeof(int),
1100 .proc_handler = proc_dointvec,
1105 .procname = "blk_iopoll",
1106 .data = &blk_iopoll_enabled,
1107 .maxlen = sizeof(int),
1109 .proc_handler = proc_dointvec,
1115 static struct ctl_table vm_table[] = {
1117 .procname = "overcommit_memory",
1118 .data = &sysctl_overcommit_memory,
1119 .maxlen = sizeof(sysctl_overcommit_memory),
1121 .proc_handler = proc_dointvec_minmax,
1126 .procname = "panic_on_oom",
1127 .data = &sysctl_panic_on_oom,
1128 .maxlen = sizeof(sysctl_panic_on_oom),
1130 .proc_handler = proc_dointvec_minmax,
1135 .procname = "oom_kill_allocating_task",
1136 .data = &sysctl_oom_kill_allocating_task,
1137 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1139 .proc_handler = proc_dointvec,
1142 .procname = "oom_dump_tasks",
1143 .data = &sysctl_oom_dump_tasks,
1144 .maxlen = sizeof(sysctl_oom_dump_tasks),
1146 .proc_handler = proc_dointvec,
1149 .procname = "overcommit_ratio",
1150 .data = &sysctl_overcommit_ratio,
1151 .maxlen = sizeof(sysctl_overcommit_ratio),
1153 .proc_handler = overcommit_ratio_handler,
1156 .procname = "overcommit_kbytes",
1157 .data = &sysctl_overcommit_kbytes,
1158 .maxlen = sizeof(sysctl_overcommit_kbytes),
1160 .proc_handler = overcommit_kbytes_handler,
1163 .procname = "page-cluster",
1164 .data = &page_cluster,
1165 .maxlen = sizeof(int),
1167 .proc_handler = proc_dointvec_minmax,
1171 .procname = "dirty_background_ratio",
1172 .data = &dirty_background_ratio,
1173 .maxlen = sizeof(dirty_background_ratio),
1175 .proc_handler = dirty_background_ratio_handler,
1177 .extra2 = &one_hundred,
1180 .procname = "dirty_background_bytes",
1181 .data = &dirty_background_bytes,
1182 .maxlen = sizeof(dirty_background_bytes),
1184 .proc_handler = dirty_background_bytes_handler,
1188 .procname = "dirty_ratio",
1189 .data = &vm_dirty_ratio,
1190 .maxlen = sizeof(vm_dirty_ratio),
1192 .proc_handler = dirty_ratio_handler,
1194 .extra2 = &one_hundred,
1197 .procname = "dirty_bytes",
1198 .data = &vm_dirty_bytes,
1199 .maxlen = sizeof(vm_dirty_bytes),
1201 .proc_handler = dirty_bytes_handler,
1202 .extra1 = &dirty_bytes_min,
1205 .procname = "dirty_writeback_centisecs",
1206 .data = &dirty_writeback_interval,
1207 .maxlen = sizeof(dirty_writeback_interval),
1209 .proc_handler = dirty_writeback_centisecs_handler,
1212 .procname = "dirty_expire_centisecs",
1213 .data = &dirty_expire_interval,
1214 .maxlen = sizeof(dirty_expire_interval),
1216 .proc_handler = proc_dointvec_minmax,
1220 .procname = "nr_pdflush_threads",
1221 .mode = 0444 /* read-only */,
1222 .proc_handler = pdflush_proc_obsolete,
1225 .procname = "swappiness",
1226 .data = &vm_swappiness,
1227 .maxlen = sizeof(vm_swappiness),
1229 .proc_handler = proc_dointvec_minmax,
1231 .extra2 = &one_hundred,
1233 #ifdef CONFIG_HUGETLB_PAGE
1235 .procname = "nr_hugepages",
1237 .maxlen = sizeof(unsigned long),
1239 .proc_handler = hugetlb_sysctl_handler,
1240 .extra1 = (void *)&hugetlb_zero,
1241 .extra2 = (void *)&hugetlb_infinity,
1245 .procname = "nr_hugepages_mempolicy",
1247 .maxlen = sizeof(unsigned long),
1249 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1250 .extra1 = (void *)&hugetlb_zero,
1251 .extra2 = (void *)&hugetlb_infinity,
1255 .procname = "hugetlb_shm_group",
1256 .data = &sysctl_hugetlb_shm_group,
1257 .maxlen = sizeof(gid_t),
1259 .proc_handler = proc_dointvec,
1262 .procname = "hugepages_treat_as_movable",
1263 .data = &hugepages_treat_as_movable,
1264 .maxlen = sizeof(int),
1266 .proc_handler = proc_dointvec,
1269 .procname = "nr_overcommit_hugepages",
1271 .maxlen = sizeof(unsigned long),
1273 .proc_handler = hugetlb_overcommit_handler,
1274 .extra1 = (void *)&hugetlb_zero,
1275 .extra2 = (void *)&hugetlb_infinity,
1279 .procname = "lowmem_reserve_ratio",
1280 .data = &sysctl_lowmem_reserve_ratio,
1281 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1283 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1286 .procname = "drop_caches",
1287 .data = &sysctl_drop_caches,
1288 .maxlen = sizeof(int),
1290 .proc_handler = drop_caches_sysctl_handler,
1294 #ifdef CONFIG_COMPACTION
1296 .procname = "compact_memory",
1297 .data = &sysctl_compact_memory,
1298 .maxlen = sizeof(int),
1300 .proc_handler = sysctl_compaction_handler,
1303 .procname = "extfrag_threshold",
1304 .data = &sysctl_extfrag_threshold,
1305 .maxlen = sizeof(int),
1307 .proc_handler = sysctl_extfrag_handler,
1308 .extra1 = &min_extfrag_threshold,
1309 .extra2 = &max_extfrag_threshold,
1312 #endif /* CONFIG_COMPACTION */
1314 .procname = "min_free_kbytes",
1315 .data = &min_free_kbytes,
1316 .maxlen = sizeof(min_free_kbytes),
1318 .proc_handler = min_free_kbytes_sysctl_handler,
1322 .procname = "percpu_pagelist_fraction",
1323 .data = &percpu_pagelist_fraction,
1324 .maxlen = sizeof(percpu_pagelist_fraction),
1326 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1327 .extra1 = &min_percpu_pagelist_fract,
1331 .procname = "max_map_count",
1332 .data = &sysctl_max_map_count,
1333 .maxlen = sizeof(sysctl_max_map_count),
1335 .proc_handler = proc_dointvec_minmax,
1340 .procname = "nr_trim_pages",
1341 .data = &sysctl_nr_trim_pages,
1342 .maxlen = sizeof(sysctl_nr_trim_pages),
1344 .proc_handler = proc_dointvec_minmax,
1349 .procname = "laptop_mode",
1350 .data = &laptop_mode,
1351 .maxlen = sizeof(laptop_mode),
1353 .proc_handler = proc_dointvec_jiffies,
1356 .procname = "block_dump",
1357 .data = &block_dump,
1358 .maxlen = sizeof(block_dump),
1360 .proc_handler = proc_dointvec,
1364 .procname = "vfs_cache_pressure",
1365 .data = &sysctl_vfs_cache_pressure,
1366 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1368 .proc_handler = proc_dointvec,
1371 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1373 .procname = "legacy_va_layout",
1374 .data = &sysctl_legacy_va_layout,
1375 .maxlen = sizeof(sysctl_legacy_va_layout),
1377 .proc_handler = proc_dointvec,
1383 .procname = "zone_reclaim_mode",
1384 .data = &zone_reclaim_mode,
1385 .maxlen = sizeof(zone_reclaim_mode),
1387 .proc_handler = proc_dointvec,
1391 .procname = "min_unmapped_ratio",
1392 .data = &sysctl_min_unmapped_ratio,
1393 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1395 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1397 .extra2 = &one_hundred,
1400 .procname = "min_slab_ratio",
1401 .data = &sysctl_min_slab_ratio,
1402 .maxlen = sizeof(sysctl_min_slab_ratio),
1404 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1406 .extra2 = &one_hundred,
1411 .procname = "stat_interval",
1412 .data = &sysctl_stat_interval,
1413 .maxlen = sizeof(sysctl_stat_interval),
1415 .proc_handler = proc_dointvec_jiffies,
1420 .procname = "mmap_min_addr",
1421 .data = &dac_mmap_min_addr,
1422 .maxlen = sizeof(unsigned long),
1424 .proc_handler = mmap_min_addr_handler,
1429 .procname = "numa_zonelist_order",
1430 .data = &numa_zonelist_order,
1431 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1433 .proc_handler = numa_zonelist_order_handler,
1436 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1437 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1439 .procname = "vdso_enabled",
1440 .data = &vdso_enabled,
1441 .maxlen = sizeof(vdso_enabled),
1443 .proc_handler = proc_dointvec,
1447 #ifdef CONFIG_HIGHMEM
1449 .procname = "highmem_is_dirtyable",
1450 .data = &vm_highmem_is_dirtyable,
1451 .maxlen = sizeof(vm_highmem_is_dirtyable),
1453 .proc_handler = proc_dointvec_minmax,
1459 .procname = "scan_unevictable_pages",
1460 .data = &scan_unevictable_pages,
1461 .maxlen = sizeof(scan_unevictable_pages),
1463 .proc_handler = scan_unevictable_handler,
1465 #ifdef CONFIG_MEMORY_FAILURE
1467 .procname = "memory_failure_early_kill",
1468 .data = &sysctl_memory_failure_early_kill,
1469 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1471 .proc_handler = proc_dointvec_minmax,
1476 .procname = "memory_failure_recovery",
1477 .data = &sysctl_memory_failure_recovery,
1478 .maxlen = sizeof(sysctl_memory_failure_recovery),
1480 .proc_handler = proc_dointvec_minmax,
1486 .procname = "user_reserve_kbytes",
1487 .data = &sysctl_user_reserve_kbytes,
1488 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1490 .proc_handler = proc_doulongvec_minmax,
1493 .procname = "admin_reserve_kbytes",
1494 .data = &sysctl_admin_reserve_kbytes,
1495 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1497 .proc_handler = proc_doulongvec_minmax,
1502 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1503 static struct ctl_table binfmt_misc_table[] = {
1508 static struct ctl_table fs_table[] = {
1510 .procname = "inode-nr",
1511 .data = &inodes_stat,
1512 .maxlen = 2*sizeof(long),
1514 .proc_handler = proc_nr_inodes,
1517 .procname = "inode-state",
1518 .data = &inodes_stat,
1519 .maxlen = 7*sizeof(long),
1521 .proc_handler = proc_nr_inodes,
1524 .procname = "file-nr",
1525 .data = &files_stat,
1526 .maxlen = sizeof(files_stat),
1528 .proc_handler = proc_nr_files,
1531 .procname = "file-max",
1532 .data = &files_stat.max_files,
1533 .maxlen = sizeof(files_stat.max_files),
1535 .proc_handler = proc_doulongvec_minmax,
1538 .procname = "nr_open",
1539 .data = &sysctl_nr_open,
1540 .maxlen = sizeof(int),
1542 .proc_handler = proc_dointvec_minmax,
1543 .extra1 = &sysctl_nr_open_min,
1544 .extra2 = &sysctl_nr_open_max,
1547 .procname = "dentry-state",
1548 .data = &dentry_stat,
1549 .maxlen = 6*sizeof(long),
1551 .proc_handler = proc_nr_dentry,
1554 .procname = "overflowuid",
1555 .data = &fs_overflowuid,
1556 .maxlen = sizeof(int),
1558 .proc_handler = proc_dointvec_minmax,
1559 .extra1 = &minolduid,
1560 .extra2 = &maxolduid,
1563 .procname = "overflowgid",
1564 .data = &fs_overflowgid,
1565 .maxlen = sizeof(int),
1567 .proc_handler = proc_dointvec_minmax,
1568 .extra1 = &minolduid,
1569 .extra2 = &maxolduid,
1571 #ifdef CONFIG_FILE_LOCKING
1573 .procname = "leases-enable",
1574 .data = &leases_enable,
1575 .maxlen = sizeof(int),
1577 .proc_handler = proc_dointvec,
1580 #ifdef CONFIG_DNOTIFY
1582 .procname = "dir-notify-enable",
1583 .data = &dir_notify_enable,
1584 .maxlen = sizeof(int),
1586 .proc_handler = proc_dointvec,
1590 #ifdef CONFIG_FILE_LOCKING
1592 .procname = "lease-break-time",
1593 .data = &lease_break_time,
1594 .maxlen = sizeof(int),
1596 .proc_handler = proc_dointvec,
1601 .procname = "aio-nr",
1603 .maxlen = sizeof(aio_nr),
1605 .proc_handler = proc_doulongvec_minmax,
1608 .procname = "aio-max-nr",
1609 .data = &aio_max_nr,
1610 .maxlen = sizeof(aio_max_nr),
1612 .proc_handler = proc_doulongvec_minmax,
1614 #endif /* CONFIG_AIO */
1615 #ifdef CONFIG_INOTIFY_USER
1617 .procname = "inotify",
1619 .child = inotify_table,
1624 .procname = "epoll",
1626 .child = epoll_table,
1631 .procname = "protected_symlinks",
1632 .data = &sysctl_protected_symlinks,
1633 .maxlen = sizeof(int),
1635 .proc_handler = proc_dointvec_minmax,
1640 .procname = "protected_hardlinks",
1641 .data = &sysctl_protected_hardlinks,
1642 .maxlen = sizeof(int),
1644 .proc_handler = proc_dointvec_minmax,
1649 .procname = "suid_dumpable",
1650 .data = &suid_dumpable,
1651 .maxlen = sizeof(int),
1653 .proc_handler = proc_dointvec_minmax_coredump,
1657 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1659 .procname = "binfmt_misc",
1661 .child = binfmt_misc_table,
1665 .procname = "pipe-max-size",
1666 .data = &pipe_max_size,
1667 .maxlen = sizeof(int),
1669 .proc_handler = &pipe_proc_fn,
1670 .extra1 = &pipe_min_size,
1675 static struct ctl_table debug_table[] = {
1676 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1678 .procname = "exception-trace",
1679 .data = &show_unhandled_signals,
1680 .maxlen = sizeof(int),
1682 .proc_handler = proc_dointvec
1685 #if defined(CONFIG_OPTPROBES)
1687 .procname = "kprobes-optimization",
1688 .data = &sysctl_kprobes_optimization,
1689 .maxlen = sizeof(int),
1691 .proc_handler = proc_kprobes_optimization_handler,
1699 static struct ctl_table dev_table[] = {
1703 int __init sysctl_init(void)
1705 struct ctl_table_header *hdr;
1707 hdr = register_sysctl_table(sysctl_base_table);
1708 kmemleak_not_leak(hdr);
1712 #endif /* CONFIG_SYSCTL */
1718 #ifdef CONFIG_PROC_SYSCTL
1720 static int _proc_do_string(void* data, int maxlen, int write,
1721 void __user *buffer,
1722 size_t *lenp, loff_t *ppos)
1728 if (!data || !maxlen || !*lenp) {
1736 while (len < *lenp) {
1737 if (get_user(c, p++))
1739 if (c == 0 || c == '\n')
1745 if(copy_from_user(data, buffer, len))
1747 ((char *) data)[len] = 0;
1765 if(copy_to_user(buffer, data, len))
1768 if(put_user('\n', ((char __user *) buffer) + len))
1779 * proc_dostring - read a string sysctl
1780 * @table: the sysctl table
1781 * @write: %TRUE if this is a write to the sysctl file
1782 * @buffer: the user buffer
1783 * @lenp: the size of the user buffer
1784 * @ppos: file position
1786 * Reads/writes a string from/to the user buffer. If the kernel
1787 * buffer provided is not large enough to hold the string, the
1788 * string is truncated. The copied string is %NULL-terminated.
1789 * If the string is being read by the user process, it is copied
1790 * and a newline '\n' is added. It is truncated if the buffer is
1793 * Returns 0 on success.
1795 int proc_dostring(struct ctl_table *table, int write,
1796 void __user *buffer, size_t *lenp, loff_t *ppos)
1798 return _proc_do_string(table->data, table->maxlen, write,
1799 buffer, lenp, ppos);
1802 static size_t proc_skip_spaces(char **buf)
1805 char *tmp = skip_spaces(*buf);
1811 static void proc_skip_char(char **buf, size_t *size, const char v)
1821 #define TMPBUFLEN 22
1823 * proc_get_long - reads an ASCII formatted integer from a user buffer
1825 * @buf: a kernel buffer
1826 * @size: size of the kernel buffer
1827 * @val: this is where the number will be stored
1828 * @neg: set to %TRUE if number is negative
1829 * @perm_tr: a vector which contains the allowed trailers
1830 * @perm_tr_len: size of the perm_tr vector
1831 * @tr: pointer to store the trailer character
1833 * In case of success %0 is returned and @buf and @size are updated with
1834 * the amount of bytes read. If @tr is non-NULL and a trailing
1835 * character exists (size is non-zero after returning from this
1836 * function), @tr is updated with the trailing character.
1838 static int proc_get_long(char **buf, size_t *size,
1839 unsigned long *val, bool *neg,
1840 const char *perm_tr, unsigned perm_tr_len, char *tr)
1843 char *p, tmp[TMPBUFLEN];
1849 if (len > TMPBUFLEN - 1)
1850 len = TMPBUFLEN - 1;
1852 memcpy(tmp, *buf, len);
1856 if (*p == '-' && *size > 1) {
1864 *val = simple_strtoul(p, &p, 0);
1868 /* We don't know if the next char is whitespace thus we may accept
1869 * invalid integers (e.g. 1234...a) or two integers instead of one
1870 * (e.g. 123...1). So lets not allow such large numbers. */
1871 if (len == TMPBUFLEN - 1)
1874 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1877 if (tr && (len < *size))
1887 * proc_put_long - converts an integer to a decimal ASCII formatted string
1889 * @buf: the user buffer
1890 * @size: the size of the user buffer
1891 * @val: the integer to be converted
1892 * @neg: sign of the number, %TRUE for negative
1894 * In case of success %0 is returned and @buf and @size are updated with
1895 * the amount of bytes written.
1897 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1901 char tmp[TMPBUFLEN], *p = tmp;
1903 sprintf(p, "%s%lu", neg ? "-" : "", val);
1907 if (copy_to_user(*buf, tmp, len))
1915 static int proc_put_char(void __user **buf, size_t *size, char c)
1918 char __user **buffer = (char __user **)buf;
1919 if (put_user(c, *buffer))
1921 (*size)--, (*buffer)++;
1927 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1929 int write, void *data)
1932 *valp = *negp ? -*lvalp : *lvalp;
1937 *lvalp = (unsigned long)-val;
1940 *lvalp = (unsigned long)val;
1946 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1948 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1949 int write, void __user *buffer,
1950 size_t *lenp, loff_t *ppos,
1951 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1952 int write, void *data),
1955 int *i, vleft, first = 1, err = 0;
1956 unsigned long page = 0;
1960 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1965 i = (int *) tbl_data;
1966 vleft = table->maxlen / sizeof(*i);
1970 conv = do_proc_dointvec_conv;
1973 if (left > PAGE_SIZE - 1)
1974 left = PAGE_SIZE - 1;
1975 page = __get_free_page(GFP_TEMPORARY);
1976 kbuf = (char *) page;
1979 if (copy_from_user(kbuf, buffer, left)) {
1986 for (; left && vleft--; i++, first=0) {
1991 left -= proc_skip_spaces(&kbuf);
1995 err = proc_get_long(&kbuf, &left, &lval, &neg,
1997 sizeof(proc_wspace_sep), NULL);
2000 if (conv(&neg, &lval, i, 1, data)) {
2005 if (conv(&neg, &lval, i, 0, data)) {
2010 err = proc_put_char(&buffer, &left, '\t');
2013 err = proc_put_long(&buffer, &left, lval, neg);
2019 if (!write && !first && left && !err)
2020 err = proc_put_char(&buffer, &left, '\n');
2021 if (write && !err && left)
2022 left -= proc_skip_spaces(&kbuf);
2027 return err ? : -EINVAL;
2034 static int do_proc_dointvec(struct ctl_table *table, int write,
2035 void __user *buffer, size_t *lenp, loff_t *ppos,
2036 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2037 int write, void *data),
2040 return __do_proc_dointvec(table->data, table, write,
2041 buffer, lenp, ppos, conv, data);
2045 * proc_dointvec - read a vector of integers
2046 * @table: the sysctl table
2047 * @write: %TRUE if this is a write to the sysctl file
2048 * @buffer: the user buffer
2049 * @lenp: the size of the user buffer
2050 * @ppos: file position
2052 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2053 * values from/to the user buffer, treated as an ASCII string.
2055 * Returns 0 on success.
2057 int proc_dointvec(struct ctl_table *table, int write,
2058 void __user *buffer, size_t *lenp, loff_t *ppos)
2060 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2065 * Taint values can only be increased
2066 * This means we can safely use a temporary.
2068 static int proc_taint(struct ctl_table *table, int write,
2069 void __user *buffer, size_t *lenp, loff_t *ppos)
2072 unsigned long tmptaint = get_taint();
2075 if (write && !capable(CAP_SYS_ADMIN))
2080 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2086 * Poor man's atomic or. Not worth adding a primitive
2087 * to everyone's atomic.h for this
2090 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2091 if ((tmptaint >> i) & 1)
2092 add_taint(i, LOCKDEP_STILL_OK);
2099 #ifdef CONFIG_PRINTK
2100 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2101 void __user *buffer, size_t *lenp, loff_t *ppos)
2103 if (write && !capable(CAP_SYS_ADMIN))
2106 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2110 struct do_proc_dointvec_minmax_conv_param {
2115 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2117 int write, void *data)
2119 struct do_proc_dointvec_minmax_conv_param *param = data;
2121 int val = *negp ? -*lvalp : *lvalp;
2122 if ((param->min && *param->min > val) ||
2123 (param->max && *param->max < val))
2130 *lvalp = (unsigned long)-val;
2133 *lvalp = (unsigned long)val;
2140 * proc_dointvec_minmax - read a vector of integers with min/max values
2141 * @table: the sysctl table
2142 * @write: %TRUE if this is a write to the sysctl file
2143 * @buffer: the user buffer
2144 * @lenp: the size of the user buffer
2145 * @ppos: file position
2147 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2148 * values from/to the user buffer, treated as an ASCII string.
2150 * This routine will ensure the values are within the range specified by
2151 * table->extra1 (min) and table->extra2 (max).
2153 * Returns 0 on success.
2155 int proc_dointvec_minmax(struct ctl_table *table, int write,
2156 void __user *buffer, size_t *lenp, loff_t *ppos)
2158 struct do_proc_dointvec_minmax_conv_param param = {
2159 .min = (int *) table->extra1,
2160 .max = (int *) table->extra2,
2162 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2163 do_proc_dointvec_minmax_conv, ¶m);
2166 static void validate_coredump_safety(void)
2168 #ifdef CONFIG_COREDUMP
2169 if (suid_dumpable == SUID_DUMP_ROOT &&
2170 core_pattern[0] != '/' && core_pattern[0] != '|') {
2171 printk(KERN_WARNING "Unsafe core_pattern used with "\
2172 "suid_dumpable=2. Pipe handler or fully qualified "\
2173 "core dump path required.\n");
2178 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2179 void __user *buffer, size_t *lenp, loff_t *ppos)
2181 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2183 validate_coredump_safety();
2187 #ifdef CONFIG_COREDUMP
2188 static int proc_dostring_coredump(struct ctl_table *table, int write,
2189 void __user *buffer, size_t *lenp, loff_t *ppos)
2191 int error = proc_dostring(table, write, buffer, lenp, ppos);
2193 validate_coredump_safety();
2198 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2199 void __user *buffer,
2200 size_t *lenp, loff_t *ppos,
2201 unsigned long convmul,
2202 unsigned long convdiv)
2204 unsigned long *i, *min, *max;
2205 int vleft, first = 1, err = 0;
2206 unsigned long page = 0;
2210 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2215 i = (unsigned long *) data;
2216 min = (unsigned long *) table->extra1;
2217 max = (unsigned long *) table->extra2;
2218 vleft = table->maxlen / sizeof(unsigned long);
2222 if (left > PAGE_SIZE - 1)
2223 left = PAGE_SIZE - 1;
2224 page = __get_free_page(GFP_TEMPORARY);
2225 kbuf = (char *) page;
2228 if (copy_from_user(kbuf, buffer, left)) {
2235 for (; left && vleft--; i++, first = 0) {
2241 left -= proc_skip_spaces(&kbuf);
2243 err = proc_get_long(&kbuf, &left, &val, &neg,
2245 sizeof(proc_wspace_sep), NULL);
2250 if ((min && val < *min) || (max && val > *max))
2254 val = convdiv * (*i) / convmul;
2256 err = proc_put_char(&buffer, &left, '\t');
2260 err = proc_put_long(&buffer, &left, val, false);
2266 if (!write && !first && left && !err)
2267 err = proc_put_char(&buffer, &left, '\n');
2269 left -= proc_skip_spaces(&kbuf);
2274 return err ? : -EINVAL;
2281 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2282 void __user *buffer,
2283 size_t *lenp, loff_t *ppos,
2284 unsigned long convmul,
2285 unsigned long convdiv)
2287 return __do_proc_doulongvec_minmax(table->data, table, write,
2288 buffer, lenp, ppos, convmul, convdiv);
2292 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2293 * @table: the sysctl table
2294 * @write: %TRUE if this is a write to the sysctl file
2295 * @buffer: the user buffer
2296 * @lenp: the size of the user buffer
2297 * @ppos: file position
2299 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2300 * values from/to the user buffer, treated as an ASCII string.
2302 * This routine will ensure the values are within the range specified by
2303 * table->extra1 (min) and table->extra2 (max).
2305 * Returns 0 on success.
2307 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2308 void __user *buffer, size_t *lenp, loff_t *ppos)
2310 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2314 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2315 * @table: the sysctl table
2316 * @write: %TRUE if this is a write to the sysctl file
2317 * @buffer: the user buffer
2318 * @lenp: the size of the user buffer
2319 * @ppos: file position
2321 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2322 * values from/to the user buffer, treated as an ASCII string. The values
2323 * are treated as milliseconds, and converted to jiffies when they are stored.
2325 * This routine will ensure the values are within the range specified by
2326 * table->extra1 (min) and table->extra2 (max).
2328 * Returns 0 on success.
2330 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2331 void __user *buffer,
2332 size_t *lenp, loff_t *ppos)
2334 return do_proc_doulongvec_minmax(table, write, buffer,
2335 lenp, ppos, HZ, 1000l);
2339 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2341 int write, void *data)
2344 if (*lvalp > LONG_MAX / HZ)
2346 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2352 lval = (unsigned long)-val;
2355 lval = (unsigned long)val;
2362 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2364 int write, void *data)
2367 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2369 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2375 lval = (unsigned long)-val;
2378 lval = (unsigned long)val;
2380 *lvalp = jiffies_to_clock_t(lval);
2385 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2387 int write, void *data)
2390 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2400 lval = (unsigned long)-val;
2403 lval = (unsigned long)val;
2405 *lvalp = jiffies_to_msecs(lval);
2411 * proc_dointvec_jiffies - read a vector of integers as seconds
2412 * @table: the sysctl table
2413 * @write: %TRUE if this is a write to the sysctl file
2414 * @buffer: the user buffer
2415 * @lenp: the size of the user buffer
2416 * @ppos: file position
2418 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2419 * values from/to the user buffer, treated as an ASCII string.
2420 * The values read are assumed to be in seconds, and are converted into
2423 * Returns 0 on success.
2425 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2426 void __user *buffer, size_t *lenp, loff_t *ppos)
2428 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2429 do_proc_dointvec_jiffies_conv,NULL);
2433 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2434 * @table: the sysctl table
2435 * @write: %TRUE if this is a write to the sysctl file
2436 * @buffer: the user buffer
2437 * @lenp: the size of the user buffer
2438 * @ppos: pointer to the file position
2440 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2441 * values from/to the user buffer, treated as an ASCII string.
2442 * The values read are assumed to be in 1/USER_HZ seconds, and
2443 * are converted into jiffies.
2445 * Returns 0 on success.
2447 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2448 void __user *buffer, size_t *lenp, loff_t *ppos)
2450 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2451 do_proc_dointvec_userhz_jiffies_conv,NULL);
2455 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2456 * @table: the sysctl table
2457 * @write: %TRUE if this is a write to the sysctl file
2458 * @buffer: the user buffer
2459 * @lenp: the size of the user buffer
2460 * @ppos: file position
2461 * @ppos: the current position in the file
2463 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2464 * values from/to the user buffer, treated as an ASCII string.
2465 * The values read are assumed to be in 1/1000 seconds, and
2466 * are converted into jiffies.
2468 * Returns 0 on success.
2470 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2471 void __user *buffer, size_t *lenp, loff_t *ppos)
2473 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2474 do_proc_dointvec_ms_jiffies_conv, NULL);
2477 static int proc_do_cad_pid(struct ctl_table *table, int write,
2478 void __user *buffer, size_t *lenp, loff_t *ppos)
2480 struct pid *new_pid;
2484 tmp = pid_vnr(cad_pid);
2486 r = __do_proc_dointvec(&tmp, table, write, buffer,
2487 lenp, ppos, NULL, NULL);
2491 new_pid = find_get_pid(tmp);
2495 put_pid(xchg(&cad_pid, new_pid));
2500 * proc_do_large_bitmap - read/write from/to a large bitmap
2501 * @table: the sysctl table
2502 * @write: %TRUE if this is a write to the sysctl file
2503 * @buffer: the user buffer
2504 * @lenp: the size of the user buffer
2505 * @ppos: file position
2507 * The bitmap is stored at table->data and the bitmap length (in bits)
2510 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2511 * large bitmaps may be represented in a compact manner. Writing into
2512 * the file will clear the bitmap then update it with the given input.
2514 * Returns 0 on success.
2516 int proc_do_large_bitmap(struct ctl_table *table, int write,
2517 void __user *buffer, size_t *lenp, loff_t *ppos)
2521 size_t left = *lenp;
2522 unsigned long bitmap_len = table->maxlen;
2523 unsigned long *bitmap = (unsigned long *) table->data;
2524 unsigned long *tmp_bitmap = NULL;
2525 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2527 if (!bitmap_len || !left || (*ppos && !write)) {
2533 unsigned long page = 0;
2536 if (left > PAGE_SIZE - 1)
2537 left = PAGE_SIZE - 1;
2539 page = __get_free_page(GFP_TEMPORARY);
2540 kbuf = (char *) page;
2543 if (copy_from_user(kbuf, buffer, left)) {
2549 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2555 proc_skip_char(&kbuf, &left, '\n');
2556 while (!err && left) {
2557 unsigned long val_a, val_b;
2560 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2564 if (val_a >= bitmap_len || neg) {
2576 err = proc_get_long(&kbuf, &left, &val_b,
2577 &neg, tr_b, sizeof(tr_b),
2581 if (val_b >= bitmap_len || neg ||
2592 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2594 proc_skip_char(&kbuf, &left, '\n');
2598 unsigned long bit_a, bit_b = 0;
2601 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2602 if (bit_a >= bitmap_len)
2604 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2608 err = proc_put_char(&buffer, &left, ',');
2612 err = proc_put_long(&buffer, &left, bit_a, false);
2615 if (bit_a != bit_b) {
2616 err = proc_put_char(&buffer, &left, '-');
2619 err = proc_put_long(&buffer, &left, bit_b, false);
2627 err = proc_put_char(&buffer, &left, '\n');
2633 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2635 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2647 #else /* CONFIG_PROC_SYSCTL */
2649 int proc_dostring(struct ctl_table *table, int write,
2650 void __user *buffer, size_t *lenp, loff_t *ppos)
2655 int proc_dointvec(struct ctl_table *table, int write,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2661 int proc_dointvec_minmax(struct ctl_table *table, int write,
2662 void __user *buffer, size_t *lenp, loff_t *ppos)
2667 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2668 void __user *buffer, size_t *lenp, loff_t *ppos)
2673 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2674 void __user *buffer, size_t *lenp, loff_t *ppos)
2679 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2680 void __user *buffer, size_t *lenp, loff_t *ppos)
2685 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2686 void __user *buffer, size_t *lenp, loff_t *ppos)
2691 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2692 void __user *buffer,
2693 size_t *lenp, loff_t *ppos)
2699 #endif /* CONFIG_PROC_SYSCTL */
2702 * No sense putting this after each symbol definition, twice,
2703 * exception granted :-)
2705 EXPORT_SYMBOL(proc_dointvec);
2706 EXPORT_SYMBOL(proc_dointvec_jiffies);
2707 EXPORT_SYMBOL(proc_dointvec_minmax);
2708 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2709 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2710 EXPORT_SYMBOL(proc_dostring);
2711 EXPORT_SYMBOL(proc_doulongvec_minmax);
2712 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);