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>
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
71 #include <asm/stacktrace.h>
75 #include <asm/setup.h>
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
86 #ifdef CONFIG_CHR_DEV_SG
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
95 #if defined(CONFIG_SYSCTL)
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
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 min_free_order_shift;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int compat_log;
112 extern int latencytop_enabled;
113 extern int sysctl_nr_open_min, sysctl_nr_open_max;
115 extern int sysctl_nr_trim_pages;
118 extern int blk_iopoll_enabled;
121 /* Constants used for minimum and maximum */
122 #ifdef CONFIG_LOCKUP_DETECTOR
123 static int sixty = 60;
124 static int neg_one = -1;
128 static int __maybe_unused one = 1;
129 static int __maybe_unused two = 2;
130 static int __maybe_unused three = 3;
131 static unsigned long one_ul = 1;
132 static int one_hundred = 100;
134 static int ten_thousand = 10000;
137 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
138 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
141 static int maxolduid = 65535;
142 static int minolduid;
143 static int min_percpu_pagelist_fract = 8;
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
154 #ifdef CONFIG_SPARC64
155 extern int sysctl_tsb_ratio;
159 extern int pwrsw_enabled;
162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
163 extern int unaligned_enabled;
167 extern int unaligned_dump_stack;
170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
171 extern int no_unaligned_warning;
174 #ifdef CONFIG_PROC_SYSCTL
175 static int proc_do_cad_pid(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
177 static int proc_taint(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
182 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
183 void __user *buffer, size_t *lenp, loff_t *ppos);
186 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
188 #ifdef CONFIG_COREDUMP
189 static int proc_dostring_coredump(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
193 #ifdef CONFIG_MAGIC_SYSRQ
194 /* Note: sysrq code uses it's own private copy */
195 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
197 static int sysrq_sysctl_handler(ctl_table *table, int write,
198 void __user *buffer, size_t *lenp,
203 error = proc_dointvec(table, write, buffer, lenp, ppos);
208 sysrq_toggle_support(__sysrq_enabled);
215 static struct ctl_table kern_table[];
216 static struct ctl_table vm_table[];
217 static struct ctl_table fs_table[];
218 static struct ctl_table debug_table[];
219 static struct ctl_table dev_table[];
220 extern struct ctl_table random_table[];
222 extern struct ctl_table epoll_table[];
225 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
226 int sysctl_legacy_va_layout;
229 /* The default sysctl tables: */
231 static struct ctl_table sysctl_base_table[] = {
233 .procname = "kernel",
250 .child = debug_table,
260 #ifdef CONFIG_SCHED_DEBUG
261 static int min_sched_granularity_ns = 100000; /* 100 usecs */
262 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
263 static int min_wakeup_granularity_ns; /* 0 usecs */
264 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
267 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
268 #endif /* CONFIG_SMP */
269 #endif /* CONFIG_SCHED_DEBUG */
271 #ifdef CONFIG_COMPACTION
272 static int min_extfrag_threshold;
273 static int max_extfrag_threshold = 1000;
276 static struct ctl_table kern_table[] = {
278 .procname = "sched_child_runs_first",
279 .data = &sysctl_sched_child_runs_first,
280 .maxlen = sizeof(unsigned int),
282 .proc_handler = proc_dointvec,
284 #ifdef CONFIG_SCHED_DEBUG
286 .procname = "sched_min_granularity_ns",
287 .data = &sysctl_sched_min_granularity,
288 .maxlen = sizeof(unsigned int),
290 .proc_handler = sched_proc_update_handler,
291 .extra1 = &min_sched_granularity_ns,
292 .extra2 = &max_sched_granularity_ns,
295 .procname = "sched_latency_ns",
296 .data = &sysctl_sched_latency,
297 .maxlen = sizeof(unsigned int),
299 .proc_handler = sched_proc_update_handler,
300 .extra1 = &min_sched_granularity_ns,
301 .extra2 = &max_sched_granularity_ns,
304 .procname = "sched_wakeup_granularity_ns",
305 .data = &sysctl_sched_wakeup_granularity,
306 .maxlen = sizeof(unsigned int),
308 .proc_handler = sched_proc_update_handler,
309 .extra1 = &min_wakeup_granularity_ns,
310 .extra2 = &max_wakeup_granularity_ns,
314 .procname = "sched_tunable_scaling",
315 .data = &sysctl_sched_tunable_scaling,
316 .maxlen = sizeof(enum sched_tunable_scaling),
318 .proc_handler = sched_proc_update_handler,
319 .extra1 = &min_sched_tunable_scaling,
320 .extra2 = &max_sched_tunable_scaling,
323 .procname = "sched_migration_cost_ns",
324 .data = &sysctl_sched_migration_cost,
325 .maxlen = sizeof(unsigned int),
327 .proc_handler = proc_dointvec,
330 .procname = "sched_nr_migrate",
331 .data = &sysctl_sched_nr_migrate,
332 .maxlen = sizeof(unsigned int),
334 .proc_handler = proc_dointvec,
337 .procname = "sched_time_avg_ms",
338 .data = &sysctl_sched_time_avg,
339 .maxlen = sizeof(unsigned int),
341 .proc_handler = proc_dointvec,
344 .procname = "sched_shares_window_ns",
345 .data = &sysctl_sched_shares_window,
346 .maxlen = sizeof(unsigned int),
348 .proc_handler = proc_dointvec,
351 .procname = "timer_migration",
352 .data = &sysctl_timer_migration,
353 .maxlen = sizeof(unsigned int),
355 .proc_handler = proc_dointvec_minmax,
359 #endif /* CONFIG_SMP */
360 #ifdef CONFIG_NUMA_BALANCING
362 .procname = "numa_balancing_scan_delay_ms",
363 .data = &sysctl_numa_balancing_scan_delay,
364 .maxlen = sizeof(unsigned int),
366 .proc_handler = proc_dointvec,
369 .procname = "numa_balancing_scan_period_min_ms",
370 .data = &sysctl_numa_balancing_scan_period_min,
371 .maxlen = sizeof(unsigned int),
373 .proc_handler = proc_dointvec,
376 .procname = "numa_balancing_scan_period_reset",
377 .data = &sysctl_numa_balancing_scan_period_reset,
378 .maxlen = sizeof(unsigned int),
380 .proc_handler = proc_dointvec,
383 .procname = "numa_balancing_scan_period_max_ms",
384 .data = &sysctl_numa_balancing_scan_period_max,
385 .maxlen = sizeof(unsigned int),
387 .proc_handler = proc_dointvec,
390 .procname = "numa_balancing_scan_size_mb",
391 .data = &sysctl_numa_balancing_scan_size,
392 .maxlen = sizeof(unsigned int),
394 .proc_handler = proc_dointvec,
396 #endif /* CONFIG_NUMA_BALANCING */
397 #endif /* CONFIG_SCHED_DEBUG */
399 .procname = "sched_rt_period_us",
400 .data = &sysctl_sched_rt_period,
401 .maxlen = sizeof(unsigned int),
403 .proc_handler = sched_rt_handler,
406 .procname = "sched_rt_runtime_us",
407 .data = &sysctl_sched_rt_runtime,
408 .maxlen = sizeof(int),
410 .proc_handler = sched_rt_handler,
413 .procname = "sched_rr_timeslice_ms",
414 .data = &sched_rr_timeslice,
415 .maxlen = sizeof(int),
417 .proc_handler = sched_rr_handler,
419 #ifdef CONFIG_SCHED_AUTOGROUP
421 .procname = "sched_autogroup_enabled",
422 .data = &sysctl_sched_autogroup_enabled,
423 .maxlen = sizeof(unsigned int),
425 .proc_handler = proc_dointvec_minmax,
430 #ifdef CONFIG_CFS_BANDWIDTH
432 .procname = "sched_cfs_bandwidth_slice_us",
433 .data = &sysctl_sched_cfs_bandwidth_slice,
434 .maxlen = sizeof(unsigned int),
436 .proc_handler = proc_dointvec_minmax,
440 #ifdef CONFIG_PROVE_LOCKING
442 .procname = "prove_locking",
443 .data = &prove_locking,
444 .maxlen = sizeof(int),
446 .proc_handler = proc_dointvec,
449 #ifdef CONFIG_LOCK_STAT
451 .procname = "lock_stat",
453 .maxlen = sizeof(int),
455 .proc_handler = proc_dointvec,
460 .data = &panic_timeout,
461 .maxlen = sizeof(int),
463 .proc_handler = proc_dointvec,
465 #ifdef CONFIG_COREDUMP
467 .procname = "core_uses_pid",
468 .data = &core_uses_pid,
469 .maxlen = sizeof(int),
471 .proc_handler = proc_dointvec,
474 .procname = "core_pattern",
475 .data = core_pattern,
476 .maxlen = CORENAME_MAX_SIZE,
478 .proc_handler = proc_dostring_coredump,
481 .procname = "core_pipe_limit",
482 .data = &core_pipe_limit,
483 .maxlen = sizeof(unsigned int),
485 .proc_handler = proc_dointvec,
488 #ifdef CONFIG_PROC_SYSCTL
490 .procname = "tainted",
491 .maxlen = sizeof(long),
493 .proc_handler = proc_taint,
496 #ifdef CONFIG_LATENCYTOP
498 .procname = "latencytop",
499 .data = &latencytop_enabled,
500 .maxlen = sizeof(int),
502 .proc_handler = proc_dointvec,
505 #ifdef CONFIG_BLK_DEV_INITRD
507 .procname = "real-root-dev",
508 .data = &real_root_dev,
509 .maxlen = sizeof(int),
511 .proc_handler = proc_dointvec,
515 .procname = "print-fatal-signals",
516 .data = &print_fatal_signals,
517 .maxlen = sizeof(int),
519 .proc_handler = proc_dointvec,
523 .procname = "reboot-cmd",
524 .data = reboot_command,
527 .proc_handler = proc_dostring,
530 .procname = "stop-a",
531 .data = &stop_a_enabled,
532 .maxlen = sizeof (int),
534 .proc_handler = proc_dointvec,
537 .procname = "scons-poweroff",
538 .data = &scons_pwroff,
539 .maxlen = sizeof (int),
541 .proc_handler = proc_dointvec,
544 #ifdef CONFIG_SPARC64
546 .procname = "tsb-ratio",
547 .data = &sysctl_tsb_ratio,
548 .maxlen = sizeof (int),
550 .proc_handler = proc_dointvec,
555 .procname = "soft-power",
556 .data = &pwrsw_enabled,
557 .maxlen = sizeof (int),
559 .proc_handler = proc_dointvec,
562 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
564 .procname = "unaligned-trap",
565 .data = &unaligned_enabled,
566 .maxlen = sizeof (int),
568 .proc_handler = proc_dointvec,
572 .procname = "ctrl-alt-del",
574 .maxlen = sizeof(int),
576 .proc_handler = proc_dointvec,
578 #ifdef CONFIG_FUNCTION_TRACER
580 .procname = "ftrace_enabled",
581 .data = &ftrace_enabled,
582 .maxlen = sizeof(int),
584 .proc_handler = ftrace_enable_sysctl,
587 #ifdef CONFIG_STACK_TRACER
589 .procname = "stack_tracer_enabled",
590 .data = &stack_tracer_enabled,
591 .maxlen = sizeof(int),
593 .proc_handler = stack_trace_sysctl,
596 #ifdef CONFIG_TRACING
598 .procname = "ftrace_dump_on_oops",
599 .data = &ftrace_dump_on_oops,
600 .maxlen = sizeof(int),
602 .proc_handler = proc_dointvec,
605 #ifdef CONFIG_MODULES
607 .procname = "modprobe",
608 .data = &modprobe_path,
609 .maxlen = KMOD_PATH_LEN,
611 .proc_handler = proc_dostring,
614 .procname = "modules_disabled",
615 .data = &modules_disabled,
616 .maxlen = sizeof(int),
618 /* only handle a transition from default "0" to "1" */
619 .proc_handler = proc_dointvec_minmax,
626 .procname = "hotplug",
627 .data = &uevent_helper,
628 .maxlen = UEVENT_HELPER_PATH_LEN,
630 .proc_handler = proc_dostring,
633 #ifdef CONFIG_CHR_DEV_SG
635 .procname = "sg-big-buff",
636 .data = &sg_big_buff,
637 .maxlen = sizeof (int),
639 .proc_handler = proc_dointvec,
642 #ifdef CONFIG_BSD_PROCESS_ACCT
646 .maxlen = 3*sizeof(int),
648 .proc_handler = proc_dointvec,
651 #ifdef CONFIG_MAGIC_SYSRQ
654 .data = &__sysrq_enabled,
655 .maxlen = sizeof (int),
657 .proc_handler = sysrq_sysctl_handler,
660 #ifdef CONFIG_PROC_SYSCTL
662 .procname = "cad_pid",
664 .maxlen = sizeof (int),
666 .proc_handler = proc_do_cad_pid,
670 .procname = "threads-max",
671 .data = &max_threads,
672 .maxlen = sizeof(int),
674 .proc_handler = proc_dointvec,
677 .procname = "random",
679 .child = random_table,
682 .procname = "usermodehelper",
684 .child = usermodehelper_table,
687 .procname = "overflowuid",
688 .data = &overflowuid,
689 .maxlen = sizeof(int),
691 .proc_handler = proc_dointvec_minmax,
692 .extra1 = &minolduid,
693 .extra2 = &maxolduid,
696 .procname = "overflowgid",
697 .data = &overflowgid,
698 .maxlen = sizeof(int),
700 .proc_handler = proc_dointvec_minmax,
701 .extra1 = &minolduid,
702 .extra2 = &maxolduid,
705 #ifdef CONFIG_MATHEMU
707 .procname = "ieee_emulation_warnings",
708 .data = &sysctl_ieee_emulation_warnings,
709 .maxlen = sizeof(int),
711 .proc_handler = proc_dointvec,
715 .procname = "userprocess_debug",
716 .data = &show_unhandled_signals,
717 .maxlen = sizeof(int),
719 .proc_handler = proc_dointvec,
723 .procname = "pid_max",
725 .maxlen = sizeof (int),
727 .proc_handler = proc_dointvec_minmax,
728 .extra1 = &pid_max_min,
729 .extra2 = &pid_max_max,
732 .procname = "panic_on_oops",
733 .data = &panic_on_oops,
734 .maxlen = sizeof(int),
736 .proc_handler = proc_dointvec,
738 #if defined CONFIG_PRINTK
740 .procname = "printk",
741 .data = &console_loglevel,
742 .maxlen = 4*sizeof(int),
744 .proc_handler = proc_dointvec,
747 .procname = "printk_ratelimit",
748 .data = &printk_ratelimit_state.interval,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec_jiffies,
754 .procname = "printk_ratelimit_burst",
755 .data = &printk_ratelimit_state.burst,
756 .maxlen = sizeof(int),
758 .proc_handler = proc_dointvec,
761 .procname = "printk_delay",
762 .data = &printk_delay_msec,
763 .maxlen = sizeof(int),
765 .proc_handler = proc_dointvec_minmax,
767 .extra2 = &ten_thousand,
770 .procname = "dmesg_restrict",
771 .data = &dmesg_restrict,
772 .maxlen = sizeof(int),
774 .proc_handler = proc_dointvec_minmax_sysadmin,
779 .procname = "kptr_restrict",
780 .data = &kptr_restrict,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_dointvec_minmax_sysadmin,
789 .procname = "ngroups_max",
790 .data = &ngroups_max,
791 .maxlen = sizeof (int),
793 .proc_handler = proc_dointvec,
796 .procname = "cap_last_cap",
797 .data = (void *)&cap_last_cap,
798 .maxlen = sizeof(int),
800 .proc_handler = proc_dointvec,
802 #if defined(CONFIG_LOCKUP_DETECTOR)
804 .procname = "watchdog",
805 .data = &watchdog_enabled,
806 .maxlen = sizeof (int),
808 .proc_handler = proc_dowatchdog,
813 .procname = "watchdog_thresh",
814 .data = &watchdog_thresh,
815 .maxlen = sizeof(int),
817 .proc_handler = proc_dowatchdog,
822 .procname = "softlockup_panic",
823 .data = &softlockup_panic,
824 .maxlen = sizeof(int),
826 .proc_handler = proc_dointvec_minmax,
831 .procname = "nmi_watchdog",
832 .data = &watchdog_enabled,
833 .maxlen = sizeof (int),
835 .proc_handler = proc_dowatchdog,
840 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
842 .procname = "unknown_nmi_panic",
843 .data = &unknown_nmi_panic,
844 .maxlen = sizeof (int),
846 .proc_handler = proc_dointvec,
849 #if defined(CONFIG_X86)
851 .procname = "panic_on_unrecovered_nmi",
852 .data = &panic_on_unrecovered_nmi,
853 .maxlen = sizeof(int),
855 .proc_handler = proc_dointvec,
858 .procname = "panic_on_io_nmi",
859 .data = &panic_on_io_nmi,
860 .maxlen = sizeof(int),
862 .proc_handler = proc_dointvec,
864 #ifdef CONFIG_DEBUG_STACKOVERFLOW
866 .procname = "panic_on_stackoverflow",
867 .data = &sysctl_panic_on_stackoverflow,
868 .maxlen = sizeof(int),
870 .proc_handler = proc_dointvec,
874 .procname = "bootloader_type",
875 .data = &bootloader_type,
876 .maxlen = sizeof (int),
878 .proc_handler = proc_dointvec,
881 .procname = "bootloader_version",
882 .data = &bootloader_version,
883 .maxlen = sizeof (int),
885 .proc_handler = proc_dointvec,
888 .procname = "kstack_depth_to_print",
889 .data = &kstack_depth_to_print,
890 .maxlen = sizeof(int),
892 .proc_handler = proc_dointvec,
895 .procname = "io_delay_type",
896 .data = &io_delay_type,
897 .maxlen = sizeof(int),
899 .proc_handler = proc_dointvec,
902 #if defined(CONFIG_MMU)
904 .procname = "randomize_va_space",
905 .data = &randomize_va_space,
906 .maxlen = sizeof(int),
908 .proc_handler = proc_dointvec,
911 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
913 .procname = "spin_retry",
915 .maxlen = sizeof (int),
917 .proc_handler = proc_dointvec,
920 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
922 .procname = "acpi_video_flags",
923 .data = &acpi_realmode_flags,
924 .maxlen = sizeof (unsigned long),
926 .proc_handler = proc_doulongvec_minmax,
929 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
931 .procname = "ignore-unaligned-usertrap",
932 .data = &no_unaligned_warning,
933 .maxlen = sizeof (int),
935 .proc_handler = proc_dointvec,
940 .procname = "unaligned-dump-stack",
941 .data = &unaligned_dump_stack,
942 .maxlen = sizeof (int),
944 .proc_handler = proc_dointvec,
947 #ifdef CONFIG_DETECT_HUNG_TASK
949 .procname = "hung_task_panic",
950 .data = &sysctl_hung_task_panic,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec_minmax,
958 .procname = "hung_task_check_count",
959 .data = &sysctl_hung_task_check_count,
960 .maxlen = sizeof(unsigned long),
962 .proc_handler = proc_doulongvec_minmax,
965 .procname = "hung_task_timeout_secs",
966 .data = &sysctl_hung_task_timeout_secs,
967 .maxlen = sizeof(unsigned long),
969 .proc_handler = proc_dohung_task_timeout_secs,
972 .procname = "hung_task_warnings",
973 .data = &sysctl_hung_task_warnings,
974 .maxlen = sizeof(unsigned long),
976 .proc_handler = proc_doulongvec_minmax,
981 .procname = "compat-log",
983 .maxlen = sizeof (int),
985 .proc_handler = proc_dointvec,
988 #ifdef CONFIG_RT_MUTEXES
990 .procname = "max_lock_depth",
991 .data = &max_lock_depth,
992 .maxlen = sizeof(int),
994 .proc_handler = proc_dointvec,
998 .procname = "poweroff_cmd",
999 .data = &poweroff_cmd,
1000 .maxlen = POWEROFF_CMD_PATH_LEN,
1002 .proc_handler = proc_dostring,
1008 .child = key_sysctls,
1011 #ifdef CONFIG_RCU_TORTURE_TEST
1013 .procname = "rcutorture_runnable",
1014 .data = &rcutorture_runnable,
1015 .maxlen = sizeof(int),
1017 .proc_handler = proc_dointvec,
1020 #ifdef CONFIG_PERF_EVENTS
1022 * User-space scripts rely on the existence of this file
1023 * as a feature check for perf_events being enabled.
1025 * So it's an ABI, do not remove!
1028 .procname = "perf_event_paranoid",
1029 .data = &sysctl_perf_event_paranoid,
1030 .maxlen = sizeof(sysctl_perf_event_paranoid),
1032 .proc_handler = proc_dointvec,
1035 .procname = "perf_event_mlock_kb",
1036 .data = &sysctl_perf_event_mlock,
1037 .maxlen = sizeof(sysctl_perf_event_mlock),
1039 .proc_handler = proc_dointvec,
1042 .procname = "perf_event_max_sample_rate",
1043 .data = &sysctl_perf_event_sample_rate,
1044 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1046 .proc_handler = perf_proc_update_handler,
1049 #ifdef CONFIG_KMEMCHECK
1051 .procname = "kmemcheck",
1052 .data = &kmemcheck_enabled,
1053 .maxlen = sizeof(int),
1055 .proc_handler = proc_dointvec,
1060 .procname = "blk_iopoll",
1061 .data = &blk_iopoll_enabled,
1062 .maxlen = sizeof(int),
1064 .proc_handler = proc_dointvec,
1070 static struct ctl_table vm_table[] = {
1072 .procname = "overcommit_memory",
1073 .data = &sysctl_overcommit_memory,
1074 .maxlen = sizeof(sysctl_overcommit_memory),
1076 .proc_handler = proc_dointvec_minmax,
1081 .procname = "panic_on_oom",
1082 .data = &sysctl_panic_on_oom,
1083 .maxlen = sizeof(sysctl_panic_on_oom),
1085 .proc_handler = proc_dointvec_minmax,
1090 .procname = "oom_kill_allocating_task",
1091 .data = &sysctl_oom_kill_allocating_task,
1092 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1094 .proc_handler = proc_dointvec,
1097 .procname = "oom_dump_tasks",
1098 .data = &sysctl_oom_dump_tasks,
1099 .maxlen = sizeof(sysctl_oom_dump_tasks),
1101 .proc_handler = proc_dointvec,
1104 .procname = "overcommit_ratio",
1105 .data = &sysctl_overcommit_ratio,
1106 .maxlen = sizeof(sysctl_overcommit_ratio),
1108 .proc_handler = proc_dointvec,
1111 .procname = "page-cluster",
1112 .data = &page_cluster,
1113 .maxlen = sizeof(int),
1115 .proc_handler = proc_dointvec_minmax,
1119 .procname = "dirty_background_ratio",
1120 .data = &dirty_background_ratio,
1121 .maxlen = sizeof(dirty_background_ratio),
1123 .proc_handler = dirty_background_ratio_handler,
1125 .extra2 = &one_hundred,
1128 .procname = "dirty_background_bytes",
1129 .data = &dirty_background_bytes,
1130 .maxlen = sizeof(dirty_background_bytes),
1132 .proc_handler = dirty_background_bytes_handler,
1136 .procname = "dirty_ratio",
1137 .data = &vm_dirty_ratio,
1138 .maxlen = sizeof(vm_dirty_ratio),
1140 .proc_handler = dirty_ratio_handler,
1142 .extra2 = &one_hundred,
1145 .procname = "dirty_bytes",
1146 .data = &vm_dirty_bytes,
1147 .maxlen = sizeof(vm_dirty_bytes),
1149 .proc_handler = dirty_bytes_handler,
1150 .extra1 = &dirty_bytes_min,
1153 .procname = "dirty_writeback_centisecs",
1154 .data = &dirty_writeback_interval,
1155 .maxlen = sizeof(dirty_writeback_interval),
1157 .proc_handler = dirty_writeback_centisecs_handler,
1160 .procname = "dirty_expire_centisecs",
1161 .data = &dirty_expire_interval,
1162 .maxlen = sizeof(dirty_expire_interval),
1164 .proc_handler = proc_dointvec_minmax,
1168 .procname = "nr_pdflush_threads",
1169 .mode = 0444 /* read-only */,
1170 .proc_handler = pdflush_proc_obsolete,
1173 .procname = "swappiness",
1174 .data = &vm_swappiness,
1175 .maxlen = sizeof(vm_swappiness),
1177 .proc_handler = proc_dointvec_minmax,
1179 .extra2 = &one_hundred,
1181 #ifdef CONFIG_HUGETLB_PAGE
1183 .procname = "nr_hugepages",
1185 .maxlen = sizeof(unsigned long),
1187 .proc_handler = hugetlb_sysctl_handler,
1188 .extra1 = (void *)&hugetlb_zero,
1189 .extra2 = (void *)&hugetlb_infinity,
1193 .procname = "nr_hugepages_mempolicy",
1195 .maxlen = sizeof(unsigned long),
1197 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1198 .extra1 = (void *)&hugetlb_zero,
1199 .extra2 = (void *)&hugetlb_infinity,
1203 .procname = "hugetlb_shm_group",
1204 .data = &sysctl_hugetlb_shm_group,
1205 .maxlen = sizeof(gid_t),
1207 .proc_handler = proc_dointvec,
1210 .procname = "hugepages_treat_as_movable",
1211 .data = &hugepages_treat_as_movable,
1212 .maxlen = sizeof(int),
1214 .proc_handler = hugetlb_treat_movable_handler,
1217 .procname = "nr_overcommit_hugepages",
1219 .maxlen = sizeof(unsigned long),
1221 .proc_handler = hugetlb_overcommit_handler,
1222 .extra1 = (void *)&hugetlb_zero,
1223 .extra2 = (void *)&hugetlb_infinity,
1227 .procname = "lowmem_reserve_ratio",
1228 .data = &sysctl_lowmem_reserve_ratio,
1229 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1231 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1234 .procname = "drop_caches",
1235 .data = &sysctl_drop_caches,
1236 .maxlen = sizeof(int),
1238 .proc_handler = drop_caches_sysctl_handler,
1242 #ifdef CONFIG_COMPACTION
1244 .procname = "compact_memory",
1245 .data = &sysctl_compact_memory,
1246 .maxlen = sizeof(int),
1248 .proc_handler = sysctl_compaction_handler,
1251 .procname = "extfrag_threshold",
1252 .data = &sysctl_extfrag_threshold,
1253 .maxlen = sizeof(int),
1255 .proc_handler = sysctl_extfrag_handler,
1256 .extra1 = &min_extfrag_threshold,
1257 .extra2 = &max_extfrag_threshold,
1260 #endif /* CONFIG_COMPACTION */
1262 .procname = "min_free_kbytes",
1263 .data = &min_free_kbytes,
1264 .maxlen = sizeof(min_free_kbytes),
1266 .proc_handler = min_free_kbytes_sysctl_handler,
1270 .procname = "min_free_order_shift",
1271 .data = &min_free_order_shift,
1272 .maxlen = sizeof(min_free_order_shift),
1274 .proc_handler = &proc_dointvec
1277 .procname = "percpu_pagelist_fraction",
1278 .data = &percpu_pagelist_fraction,
1279 .maxlen = sizeof(percpu_pagelist_fraction),
1281 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1282 .extra1 = &min_percpu_pagelist_fract,
1286 .procname = "max_map_count",
1287 .data = &sysctl_max_map_count,
1288 .maxlen = sizeof(sysctl_max_map_count),
1290 .proc_handler = proc_dointvec_minmax,
1295 .procname = "nr_trim_pages",
1296 .data = &sysctl_nr_trim_pages,
1297 .maxlen = sizeof(sysctl_nr_trim_pages),
1299 .proc_handler = proc_dointvec_minmax,
1304 .procname = "laptop_mode",
1305 .data = &laptop_mode,
1306 .maxlen = sizeof(laptop_mode),
1308 .proc_handler = proc_dointvec_jiffies,
1311 .procname = "block_dump",
1312 .data = &block_dump,
1313 .maxlen = sizeof(block_dump),
1315 .proc_handler = proc_dointvec,
1319 .procname = "vfs_cache_pressure",
1320 .data = &sysctl_vfs_cache_pressure,
1321 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1323 .proc_handler = proc_dointvec,
1326 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1328 .procname = "legacy_va_layout",
1329 .data = &sysctl_legacy_va_layout,
1330 .maxlen = sizeof(sysctl_legacy_va_layout),
1332 .proc_handler = proc_dointvec,
1338 .procname = "zone_reclaim_mode",
1339 .data = &zone_reclaim_mode,
1340 .maxlen = sizeof(zone_reclaim_mode),
1342 .proc_handler = proc_dointvec,
1346 .procname = "min_unmapped_ratio",
1347 .data = &sysctl_min_unmapped_ratio,
1348 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1350 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1352 .extra2 = &one_hundred,
1355 .procname = "min_slab_ratio",
1356 .data = &sysctl_min_slab_ratio,
1357 .maxlen = sizeof(sysctl_min_slab_ratio),
1359 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1361 .extra2 = &one_hundred,
1366 .procname = "stat_interval",
1367 .data = &sysctl_stat_interval,
1368 .maxlen = sizeof(sysctl_stat_interval),
1370 .proc_handler = proc_dointvec_jiffies,
1375 .procname = "mmap_min_addr",
1376 .data = &dac_mmap_min_addr,
1377 .maxlen = sizeof(unsigned long),
1379 .proc_handler = mmap_min_addr_handler,
1384 .procname = "numa_zonelist_order",
1385 .data = &numa_zonelist_order,
1386 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1388 .proc_handler = numa_zonelist_order_handler,
1391 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1392 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1394 .procname = "vdso_enabled",
1395 .data = &vdso_enabled,
1396 .maxlen = sizeof(vdso_enabled),
1398 .proc_handler = proc_dointvec,
1402 #ifdef CONFIG_HIGHMEM
1404 .procname = "highmem_is_dirtyable",
1405 .data = &vm_highmem_is_dirtyable,
1406 .maxlen = sizeof(vm_highmem_is_dirtyable),
1408 .proc_handler = proc_dointvec_minmax,
1414 .procname = "scan_unevictable_pages",
1415 .data = &scan_unevictable_pages,
1416 .maxlen = sizeof(scan_unevictable_pages),
1418 .proc_handler = scan_unevictable_handler,
1420 #ifdef CONFIG_MEMORY_FAILURE
1422 .procname = "memory_failure_early_kill",
1423 .data = &sysctl_memory_failure_early_kill,
1424 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1426 .proc_handler = proc_dointvec_minmax,
1431 .procname = "memory_failure_recovery",
1432 .data = &sysctl_memory_failure_recovery,
1433 .maxlen = sizeof(sysctl_memory_failure_recovery),
1435 .proc_handler = proc_dointvec_minmax,
1441 .procname = "user_reserve_kbytes",
1442 .data = &sysctl_user_reserve_kbytes,
1443 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1445 .proc_handler = proc_doulongvec_minmax,
1448 .procname = "admin_reserve_kbytes",
1449 .data = &sysctl_admin_reserve_kbytes,
1450 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1452 .proc_handler = proc_doulongvec_minmax,
1457 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1458 static struct ctl_table binfmt_misc_table[] = {
1463 static struct ctl_table fs_table[] = {
1465 .procname = "inode-nr",
1466 .data = &inodes_stat,
1467 .maxlen = 2*sizeof(int),
1469 .proc_handler = proc_nr_inodes,
1472 .procname = "inode-state",
1473 .data = &inodes_stat,
1474 .maxlen = 7*sizeof(int),
1476 .proc_handler = proc_nr_inodes,
1479 .procname = "file-nr",
1480 .data = &files_stat,
1481 .maxlen = sizeof(files_stat),
1483 .proc_handler = proc_nr_files,
1486 .procname = "file-max",
1487 .data = &files_stat.max_files,
1488 .maxlen = sizeof(files_stat.max_files),
1490 .proc_handler = proc_doulongvec_minmax,
1493 .procname = "nr_open",
1494 .data = &sysctl_nr_open,
1495 .maxlen = sizeof(int),
1497 .proc_handler = proc_dointvec_minmax,
1498 .extra1 = &sysctl_nr_open_min,
1499 .extra2 = &sysctl_nr_open_max,
1502 .procname = "dentry-state",
1503 .data = &dentry_stat,
1504 .maxlen = 6*sizeof(int),
1506 .proc_handler = proc_nr_dentry,
1509 .procname = "overflowuid",
1510 .data = &fs_overflowuid,
1511 .maxlen = sizeof(int),
1513 .proc_handler = proc_dointvec_minmax,
1514 .extra1 = &minolduid,
1515 .extra2 = &maxolduid,
1518 .procname = "overflowgid",
1519 .data = &fs_overflowgid,
1520 .maxlen = sizeof(int),
1522 .proc_handler = proc_dointvec_minmax,
1523 .extra1 = &minolduid,
1524 .extra2 = &maxolduid,
1526 #ifdef CONFIG_FILE_LOCKING
1528 .procname = "leases-enable",
1529 .data = &leases_enable,
1530 .maxlen = sizeof(int),
1532 .proc_handler = proc_dointvec,
1535 #ifdef CONFIG_DNOTIFY
1537 .procname = "dir-notify-enable",
1538 .data = &dir_notify_enable,
1539 .maxlen = sizeof(int),
1541 .proc_handler = proc_dointvec,
1545 #ifdef CONFIG_FILE_LOCKING
1547 .procname = "lease-break-time",
1548 .data = &lease_break_time,
1549 .maxlen = sizeof(int),
1551 .proc_handler = proc_dointvec,
1556 .procname = "aio-nr",
1558 .maxlen = sizeof(aio_nr),
1560 .proc_handler = proc_doulongvec_minmax,
1563 .procname = "aio-max-nr",
1564 .data = &aio_max_nr,
1565 .maxlen = sizeof(aio_max_nr),
1567 .proc_handler = proc_doulongvec_minmax,
1569 #endif /* CONFIG_AIO */
1570 #ifdef CONFIG_INOTIFY_USER
1572 .procname = "inotify",
1574 .child = inotify_table,
1579 .procname = "epoll",
1581 .child = epoll_table,
1586 .procname = "protected_symlinks",
1587 .data = &sysctl_protected_symlinks,
1588 .maxlen = sizeof(int),
1590 .proc_handler = proc_dointvec_minmax,
1595 .procname = "protected_hardlinks",
1596 .data = &sysctl_protected_hardlinks,
1597 .maxlen = sizeof(int),
1599 .proc_handler = proc_dointvec_minmax,
1604 .procname = "suid_dumpable",
1605 .data = &suid_dumpable,
1606 .maxlen = sizeof(int),
1608 .proc_handler = proc_dointvec_minmax_coredump,
1612 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1614 .procname = "binfmt_misc",
1616 .child = binfmt_misc_table,
1620 .procname = "pipe-max-size",
1621 .data = &pipe_max_size,
1622 .maxlen = sizeof(int),
1624 .proc_handler = &pipe_proc_fn,
1625 .extra1 = &pipe_min_size,
1630 static struct ctl_table debug_table[] = {
1631 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1633 .procname = "exception-trace",
1634 .data = &show_unhandled_signals,
1635 .maxlen = sizeof(int),
1637 .proc_handler = proc_dointvec
1640 #if defined(CONFIG_OPTPROBES)
1642 .procname = "kprobes-optimization",
1643 .data = &sysctl_kprobes_optimization,
1644 .maxlen = sizeof(int),
1646 .proc_handler = proc_kprobes_optimization_handler,
1654 static struct ctl_table dev_table[] = {
1658 int __init sysctl_init(void)
1660 struct ctl_table_header *hdr;
1662 hdr = register_sysctl_table(sysctl_base_table);
1663 kmemleak_not_leak(hdr);
1667 #endif /* CONFIG_SYSCTL */
1673 #ifdef CONFIG_PROC_SYSCTL
1675 static int _proc_do_string(void* data, int maxlen, int write,
1676 void __user *buffer,
1677 size_t *lenp, loff_t *ppos)
1683 if (!data || !maxlen || !*lenp) {
1691 while (len < *lenp) {
1692 if (get_user(c, p++))
1694 if (c == 0 || c == '\n')
1700 if(copy_from_user(data, buffer, len))
1702 ((char *) data)[len] = 0;
1720 if(copy_to_user(buffer, data, len))
1723 if(put_user('\n', ((char __user *) buffer) + len))
1734 * proc_dostring - read a string sysctl
1735 * @table: the sysctl table
1736 * @write: %TRUE if this is a write to the sysctl file
1737 * @buffer: the user buffer
1738 * @lenp: the size of the user buffer
1739 * @ppos: file position
1741 * Reads/writes a string from/to the user buffer. If the kernel
1742 * buffer provided is not large enough to hold the string, the
1743 * string is truncated. The copied string is %NULL-terminated.
1744 * If the string is being read by the user process, it is copied
1745 * and a newline '\n' is added. It is truncated if the buffer is
1748 * Returns 0 on success.
1750 int proc_dostring(struct ctl_table *table, int write,
1751 void __user *buffer, size_t *lenp, loff_t *ppos)
1753 return _proc_do_string(table->data, table->maxlen, write,
1754 buffer, lenp, ppos);
1757 static size_t proc_skip_spaces(char **buf)
1760 char *tmp = skip_spaces(*buf);
1766 static void proc_skip_char(char **buf, size_t *size, const char v)
1776 #define TMPBUFLEN 22
1778 * proc_get_long - reads an ASCII formatted integer from a user buffer
1780 * @buf: a kernel buffer
1781 * @size: size of the kernel buffer
1782 * @val: this is where the number will be stored
1783 * @neg: set to %TRUE if number is negative
1784 * @perm_tr: a vector which contains the allowed trailers
1785 * @perm_tr_len: size of the perm_tr vector
1786 * @tr: pointer to store the trailer character
1788 * In case of success %0 is returned and @buf and @size are updated with
1789 * the amount of bytes read. If @tr is non-NULL and a trailing
1790 * character exists (size is non-zero after returning from this
1791 * function), @tr is updated with the trailing character.
1793 static int proc_get_long(char **buf, size_t *size,
1794 unsigned long *val, bool *neg,
1795 const char *perm_tr, unsigned perm_tr_len, char *tr)
1798 char *p, tmp[TMPBUFLEN];
1804 if (len > TMPBUFLEN - 1)
1805 len = TMPBUFLEN - 1;
1807 memcpy(tmp, *buf, len);
1811 if (*p == '-' && *size > 1) {
1819 *val = simple_strtoul(p, &p, 0);
1823 /* We don't know if the next char is whitespace thus we may accept
1824 * invalid integers (e.g. 1234...a) or two integers instead of one
1825 * (e.g. 123...1). So lets not allow such large numbers. */
1826 if (len == TMPBUFLEN - 1)
1829 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1832 if (tr && (len < *size))
1842 * proc_put_long - converts an integer to a decimal ASCII formatted string
1844 * @buf: the user buffer
1845 * @size: the size of the user buffer
1846 * @val: the integer to be converted
1847 * @neg: sign of the number, %TRUE for negative
1849 * In case of success %0 is returned and @buf and @size are updated with
1850 * the amount of bytes written.
1852 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1856 char tmp[TMPBUFLEN], *p = tmp;
1858 sprintf(p, "%s%lu", neg ? "-" : "", val);
1862 if (copy_to_user(*buf, tmp, len))
1870 static int proc_put_char(void __user **buf, size_t *size, char c)
1873 char __user **buffer = (char __user **)buf;
1874 if (put_user(c, *buffer))
1876 (*size)--, (*buffer)++;
1882 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1884 int write, void *data)
1887 *valp = *negp ? -*lvalp : *lvalp;
1892 *lvalp = (unsigned long)-val;
1895 *lvalp = (unsigned long)val;
1901 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1903 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1904 int write, void __user *buffer,
1905 size_t *lenp, loff_t *ppos,
1906 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1907 int write, void *data),
1910 int *i, vleft, first = 1, err = 0;
1911 unsigned long page = 0;
1915 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1920 i = (int *) tbl_data;
1921 vleft = table->maxlen / sizeof(*i);
1925 conv = do_proc_dointvec_conv;
1928 if (left > PAGE_SIZE - 1)
1929 left = PAGE_SIZE - 1;
1930 page = __get_free_page(GFP_TEMPORARY);
1931 kbuf = (char *) page;
1934 if (copy_from_user(kbuf, buffer, left)) {
1941 for (; left && vleft--; i++, first=0) {
1946 left -= proc_skip_spaces(&kbuf);
1950 err = proc_get_long(&kbuf, &left, &lval, &neg,
1952 sizeof(proc_wspace_sep), NULL);
1955 if (conv(&neg, &lval, i, 1, data)) {
1960 if (conv(&neg, &lval, i, 0, data)) {
1965 err = proc_put_char(&buffer, &left, '\t');
1968 err = proc_put_long(&buffer, &left, lval, neg);
1974 if (!write && !first && left && !err)
1975 err = proc_put_char(&buffer, &left, '\n');
1976 if (write && !err && left)
1977 left -= proc_skip_spaces(&kbuf);
1982 return err ? : -EINVAL;
1989 static int do_proc_dointvec(struct ctl_table *table, int write,
1990 void __user *buffer, size_t *lenp, loff_t *ppos,
1991 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1992 int write, void *data),
1995 return __do_proc_dointvec(table->data, table, write,
1996 buffer, lenp, ppos, conv, data);
2000 * proc_dointvec - read a vector of integers
2001 * @table: the sysctl table
2002 * @write: %TRUE if this is a write to the sysctl file
2003 * @buffer: the user buffer
2004 * @lenp: the size of the user buffer
2005 * @ppos: file position
2007 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2008 * values from/to the user buffer, treated as an ASCII string.
2010 * Returns 0 on success.
2012 int proc_dointvec(struct ctl_table *table, int write,
2013 void __user *buffer, size_t *lenp, loff_t *ppos)
2015 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2020 * Taint values can only be increased
2021 * This means we can safely use a temporary.
2023 static int proc_taint(struct ctl_table *table, int write,
2024 void __user *buffer, size_t *lenp, loff_t *ppos)
2027 unsigned long tmptaint = get_taint();
2030 if (write && !capable(CAP_SYS_ADMIN))
2035 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2041 * Poor man's atomic or. Not worth adding a primitive
2042 * to everyone's atomic.h for this
2045 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2046 if ((tmptaint >> i) & 1)
2047 add_taint(i, LOCKDEP_STILL_OK);
2054 #ifdef CONFIG_PRINTK
2055 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2056 void __user *buffer, size_t *lenp, loff_t *ppos)
2058 if (write && !capable(CAP_SYS_ADMIN))
2061 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2065 struct do_proc_dointvec_minmax_conv_param {
2070 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2072 int write, void *data)
2074 struct do_proc_dointvec_minmax_conv_param *param = data;
2076 int val = *negp ? -*lvalp : *lvalp;
2077 if ((param->min && *param->min > val) ||
2078 (param->max && *param->max < val))
2085 *lvalp = (unsigned long)-val;
2088 *lvalp = (unsigned long)val;
2095 * proc_dointvec_minmax - read a vector of integers with min/max values
2096 * @table: the sysctl table
2097 * @write: %TRUE if this is a write to the sysctl file
2098 * @buffer: the user buffer
2099 * @lenp: the size of the user buffer
2100 * @ppos: file position
2102 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2103 * values from/to the user buffer, treated as an ASCII string.
2105 * This routine will ensure the values are within the range specified by
2106 * table->extra1 (min) and table->extra2 (max).
2108 * Returns 0 on success.
2110 int proc_dointvec_minmax(struct ctl_table *table, int write,
2111 void __user *buffer, size_t *lenp, loff_t *ppos)
2113 struct do_proc_dointvec_minmax_conv_param param = {
2114 .min = (int *) table->extra1,
2115 .max = (int *) table->extra2,
2117 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2118 do_proc_dointvec_minmax_conv, ¶m);
2121 static void validate_coredump_safety(void)
2123 #ifdef CONFIG_COREDUMP
2124 if (suid_dumpable == SUID_DUMP_ROOT &&
2125 core_pattern[0] != '/' && core_pattern[0] != '|') {
2126 printk(KERN_WARNING "Unsafe core_pattern used with "\
2127 "suid_dumpable=2. Pipe handler or fully qualified "\
2128 "core dump path required.\n");
2133 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2134 void __user *buffer, size_t *lenp, loff_t *ppos)
2136 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2138 validate_coredump_safety();
2142 #ifdef CONFIG_COREDUMP
2143 static int proc_dostring_coredump(struct ctl_table *table, int write,
2144 void __user *buffer, size_t *lenp, loff_t *ppos)
2146 int error = proc_dostring(table, write, buffer, lenp, ppos);
2148 validate_coredump_safety();
2153 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2154 void __user *buffer,
2155 size_t *lenp, loff_t *ppos,
2156 unsigned long convmul,
2157 unsigned long convdiv)
2159 unsigned long *i, *min, *max;
2160 int vleft, first = 1, err = 0;
2161 unsigned long page = 0;
2165 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2170 i = (unsigned long *) data;
2171 min = (unsigned long *) table->extra1;
2172 max = (unsigned long *) table->extra2;
2173 vleft = table->maxlen / sizeof(unsigned long);
2177 if (left > PAGE_SIZE - 1)
2178 left = PAGE_SIZE - 1;
2179 page = __get_free_page(GFP_TEMPORARY);
2180 kbuf = (char *) page;
2183 if (copy_from_user(kbuf, buffer, left)) {
2190 for (; left && vleft--; i++, first = 0) {
2196 left -= proc_skip_spaces(&kbuf);
2198 err = proc_get_long(&kbuf, &left, &val, &neg,
2200 sizeof(proc_wspace_sep), NULL);
2205 if ((min && val < *min) || (max && val > *max))
2209 val = convdiv * (*i) / convmul;
2211 err = proc_put_char(&buffer, &left, '\t');
2212 err = proc_put_long(&buffer, &left, val, false);
2218 if (!write && !first && left && !err)
2219 err = proc_put_char(&buffer, &left, '\n');
2221 left -= proc_skip_spaces(&kbuf);
2226 return err ? : -EINVAL;
2233 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2234 void __user *buffer,
2235 size_t *lenp, loff_t *ppos,
2236 unsigned long convmul,
2237 unsigned long convdiv)
2239 return __do_proc_doulongvec_minmax(table->data, table, write,
2240 buffer, lenp, ppos, convmul, convdiv);
2244 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2245 * @table: the sysctl table
2246 * @write: %TRUE if this is a write to the sysctl file
2247 * @buffer: the user buffer
2248 * @lenp: the size of the user buffer
2249 * @ppos: file position
2251 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2252 * values from/to the user buffer, treated as an ASCII string.
2254 * This routine will ensure the values are within the range specified by
2255 * table->extra1 (min) and table->extra2 (max).
2257 * Returns 0 on success.
2259 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2262 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2266 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2267 * @table: the sysctl table
2268 * @write: %TRUE if this is a write to the sysctl file
2269 * @buffer: the user buffer
2270 * @lenp: the size of the user buffer
2271 * @ppos: file position
2273 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2274 * values from/to the user buffer, treated as an ASCII string. The values
2275 * are treated as milliseconds, and converted to jiffies when they are stored.
2277 * This routine will ensure the values are within the range specified by
2278 * table->extra1 (min) and table->extra2 (max).
2280 * Returns 0 on success.
2282 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2283 void __user *buffer,
2284 size_t *lenp, loff_t *ppos)
2286 return do_proc_doulongvec_minmax(table, write, buffer,
2287 lenp, ppos, HZ, 1000l);
2291 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2293 int write, void *data)
2296 if (*lvalp > LONG_MAX / HZ)
2298 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2304 lval = (unsigned long)-val;
2307 lval = (unsigned long)val;
2314 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2316 int write, void *data)
2319 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2321 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2327 lval = (unsigned long)-val;
2330 lval = (unsigned long)val;
2332 *lvalp = jiffies_to_clock_t(lval);
2337 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2339 int write, void *data)
2342 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2348 lval = (unsigned long)-val;
2351 lval = (unsigned long)val;
2353 *lvalp = jiffies_to_msecs(lval);
2359 * proc_dointvec_jiffies - read a vector of integers as seconds
2360 * @table: the sysctl table
2361 * @write: %TRUE if this is a write to the sysctl file
2362 * @buffer: the user buffer
2363 * @lenp: the size of the user buffer
2364 * @ppos: file position
2366 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2367 * values from/to the user buffer, treated as an ASCII string.
2368 * The values read are assumed to be in seconds, and are converted into
2371 * Returns 0 on success.
2373 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2374 void __user *buffer, size_t *lenp, loff_t *ppos)
2376 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2377 do_proc_dointvec_jiffies_conv,NULL);
2381 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2382 * @table: the sysctl table
2383 * @write: %TRUE if this is a write to the sysctl file
2384 * @buffer: the user buffer
2385 * @lenp: the size of the user buffer
2386 * @ppos: pointer to the file position
2388 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2389 * values from/to the user buffer, treated as an ASCII string.
2390 * The values read are assumed to be in 1/USER_HZ seconds, and
2391 * are converted into jiffies.
2393 * Returns 0 on success.
2395 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2396 void __user *buffer, size_t *lenp, loff_t *ppos)
2398 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2399 do_proc_dointvec_userhz_jiffies_conv,NULL);
2403 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2404 * @table: the sysctl table
2405 * @write: %TRUE if this is a write to the sysctl file
2406 * @buffer: the user buffer
2407 * @lenp: the size of the user buffer
2408 * @ppos: file position
2409 * @ppos: the current position in the file
2411 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2412 * values from/to the user buffer, treated as an ASCII string.
2413 * The values read are assumed to be in 1/1000 seconds, and
2414 * are converted into jiffies.
2416 * Returns 0 on success.
2418 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2419 void __user *buffer, size_t *lenp, loff_t *ppos)
2421 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2422 do_proc_dointvec_ms_jiffies_conv, NULL);
2425 static int proc_do_cad_pid(struct ctl_table *table, int write,
2426 void __user *buffer, size_t *lenp, loff_t *ppos)
2428 struct pid *new_pid;
2432 tmp = pid_vnr(cad_pid);
2434 r = __do_proc_dointvec(&tmp, table, write, buffer,
2435 lenp, ppos, NULL, NULL);
2439 new_pid = find_get_pid(tmp);
2443 put_pid(xchg(&cad_pid, new_pid));
2448 * proc_do_large_bitmap - read/write from/to a large bitmap
2449 * @table: the sysctl table
2450 * @write: %TRUE if this is a write to the sysctl file
2451 * @buffer: the user buffer
2452 * @lenp: the size of the user buffer
2453 * @ppos: file position
2455 * The bitmap is stored at table->data and the bitmap length (in bits)
2458 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2459 * large bitmaps may be represented in a compact manner. Writing into
2460 * the file will clear the bitmap then update it with the given input.
2462 * Returns 0 on success.
2464 int proc_do_large_bitmap(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2469 size_t left = *lenp;
2470 unsigned long bitmap_len = table->maxlen;
2471 unsigned long *bitmap = (unsigned long *) table->data;
2472 unsigned long *tmp_bitmap = NULL;
2473 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2475 if (!bitmap_len || !left || (*ppos && !write)) {
2481 unsigned long page = 0;
2484 if (left > PAGE_SIZE - 1)
2485 left = PAGE_SIZE - 1;
2487 page = __get_free_page(GFP_TEMPORARY);
2488 kbuf = (char *) page;
2491 if (copy_from_user(kbuf, buffer, left)) {
2497 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2503 proc_skip_char(&kbuf, &left, '\n');
2504 while (!err && left) {
2505 unsigned long val_a, val_b;
2508 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2512 if (val_a >= bitmap_len || neg) {
2524 err = proc_get_long(&kbuf, &left, &val_b,
2525 &neg, tr_b, sizeof(tr_b),
2529 if (val_b >= bitmap_len || neg ||
2540 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2542 proc_skip_char(&kbuf, &left, '\n');
2546 unsigned long bit_a, bit_b = 0;
2549 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2550 if (bit_a >= bitmap_len)
2552 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2556 err = proc_put_char(&buffer, &left, ',');
2560 err = proc_put_long(&buffer, &left, bit_a, false);
2563 if (bit_a != bit_b) {
2564 err = proc_put_char(&buffer, &left, '-');
2567 err = proc_put_long(&buffer, &left, bit_b, false);
2575 err = proc_put_char(&buffer, &left, '\n');
2581 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2583 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2595 #else /* CONFIG_PROC_SYSCTL */
2597 int proc_dostring(struct ctl_table *table, int write,
2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2603 int proc_dointvec(struct ctl_table *table, int write,
2604 void __user *buffer, size_t *lenp, loff_t *ppos)
2609 int proc_dointvec_minmax(struct ctl_table *table, int write,
2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2615 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2616 void __user *buffer, size_t *lenp, loff_t *ppos)
2621 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2627 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2628 void __user *buffer, size_t *lenp, loff_t *ppos)
2633 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2634 void __user *buffer, size_t *lenp, loff_t *ppos)
2639 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2640 void __user *buffer,
2641 size_t *lenp, loff_t *ppos)
2647 #endif /* CONFIG_PROC_SYSCTL */
2650 * No sense putting this after each symbol definition, twice,
2651 * exception granted :-)
2653 EXPORT_SYMBOL(proc_dointvec);
2654 EXPORT_SYMBOL(proc_dointvec_jiffies);
2655 EXPORT_SYMBOL(proc_dointvec_minmax);
2656 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2657 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2658 EXPORT_SYMBOL(proc_dostring);
2659 EXPORT_SYMBOL(proc_doulongvec_minmax);
2660 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);