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_kbytes;
109 extern int pid_max_min, pid_max_max;
110 extern int sysctl_drop_caches;
111 extern int percpu_pagelist_fraction;
112 extern int compat_log;
113 extern int latencytop_enabled;
114 extern int sysctl_nr_open_min, sysctl_nr_open_max;
116 extern int sysctl_nr_trim_pages;
119 extern int blk_iopoll_enabled;
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 static int neg_one = -1;
129 static int __maybe_unused one = 1;
130 static int __maybe_unused two = 2;
131 static int __maybe_unused three = 3;
132 static unsigned long one_ul = 1;
133 static int one_hundred = 100;
135 static int ten_thousand = 10000;
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144 static int min_percpu_pagelist_fract = 8;
146 static int ngroups_max = NGROUPS_MAX;
147 static const int cap_last_cap = CAP_LAST_CAP;
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
155 #ifdef CONFIG_SPARC64
156 extern int sysctl_tsb_ratio;
160 extern int pwrsw_enabled;
161 extern int unaligned_enabled;
165 extern int no_unaligned_warning;
166 extern int unaligned_dump_stack;
169 #ifdef CONFIG_PROC_SYSCTL
170 static int proc_do_cad_pid(struct ctl_table *table, int write,
171 void __user *buffer, size_t *lenp, loff_t *ppos);
172 static int proc_taint(struct ctl_table *table, int write,
173 void __user *buffer, size_t *lenp, loff_t *ppos);
177 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
181 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #ifdef CONFIG_COREDUMP
184 static int proc_dostring_coredump(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
188 #ifdef CONFIG_MAGIC_SYSRQ
189 /* Note: sysrq code uses it's own private copy */
190 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
192 static int sysrq_sysctl_handler(ctl_table *table, int write,
193 void __user *buffer, size_t *lenp,
198 error = proc_dointvec(table, write, buffer, lenp, ppos);
203 sysrq_toggle_support(__sysrq_enabled);
210 static struct ctl_table kern_table[];
211 static struct ctl_table vm_table[];
212 static struct ctl_table fs_table[];
213 static struct ctl_table debug_table[];
214 static struct ctl_table dev_table[];
215 extern struct ctl_table random_table[];
217 extern struct ctl_table epoll_table[];
220 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
221 int sysctl_legacy_va_layout;
224 /* The default sysctl tables: */
226 static struct ctl_table sysctl_base_table[] = {
228 .procname = "kernel",
245 .child = debug_table,
255 #ifdef CONFIG_SCHED_DEBUG
256 static int min_sched_granularity_ns = 100000; /* 100 usecs */
257 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
258 static int min_wakeup_granularity_ns; /* 0 usecs */
259 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
262 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
263 #endif /* CONFIG_SMP */
264 #endif /* CONFIG_SCHED_DEBUG */
266 #ifdef CONFIG_COMPACTION
267 static int min_extfrag_threshold;
268 static int max_extfrag_threshold = 1000;
271 static struct ctl_table kern_table[] = {
273 .procname = "sched_child_runs_first",
274 .data = &sysctl_sched_child_runs_first,
275 .maxlen = sizeof(unsigned int),
277 .proc_handler = proc_dointvec,
279 #ifdef CONFIG_SCHED_DEBUG
281 .procname = "sched_min_granularity_ns",
282 .data = &sysctl_sched_min_granularity,
283 .maxlen = sizeof(unsigned int),
285 .proc_handler = sched_proc_update_handler,
286 .extra1 = &min_sched_granularity_ns,
287 .extra2 = &max_sched_granularity_ns,
290 .procname = "sched_latency_ns",
291 .data = &sysctl_sched_latency,
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_wakeup_granularity_ns",
300 .data = &sysctl_sched_wakeup_granularity,
301 .maxlen = sizeof(unsigned int),
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_wakeup_granularity_ns,
305 .extra2 = &max_wakeup_granularity_ns,
309 .procname = "sched_tunable_scaling",
310 .data = &sysctl_sched_tunable_scaling,
311 .maxlen = sizeof(enum sched_tunable_scaling),
313 .proc_handler = sched_proc_update_handler,
314 .extra1 = &min_sched_tunable_scaling,
315 .extra2 = &max_sched_tunable_scaling,
318 .procname = "sched_migration_cost_ns",
319 .data = &sysctl_sched_migration_cost,
320 .maxlen = sizeof(unsigned int),
322 .proc_handler = proc_dointvec,
325 .procname = "sched_nr_migrate",
326 .data = &sysctl_sched_nr_migrate,
327 .maxlen = sizeof(unsigned int),
329 .proc_handler = proc_dointvec,
332 .procname = "sched_time_avg_ms",
333 .data = &sysctl_sched_time_avg,
334 .maxlen = sizeof(unsigned int),
336 .proc_handler = proc_dointvec,
339 .procname = "sched_shares_window_ns",
340 .data = &sysctl_sched_shares_window,
341 .maxlen = sizeof(unsigned int),
343 .proc_handler = proc_dointvec,
346 .procname = "timer_migration",
347 .data = &sysctl_timer_migration,
348 .maxlen = sizeof(unsigned int),
350 .proc_handler = proc_dointvec_minmax,
354 #endif /* CONFIG_SMP */
355 #ifdef CONFIG_NUMA_BALANCING
357 .procname = "numa_balancing_scan_delay_ms",
358 .data = &sysctl_numa_balancing_scan_delay,
359 .maxlen = sizeof(unsigned int),
361 .proc_handler = proc_dointvec,
364 .procname = "numa_balancing_scan_period_min_ms",
365 .data = &sysctl_numa_balancing_scan_period_min,
366 .maxlen = sizeof(unsigned int),
368 .proc_handler = proc_dointvec,
371 .procname = "numa_balancing_scan_period_reset",
372 .data = &sysctl_numa_balancing_scan_period_reset,
373 .maxlen = sizeof(unsigned int),
375 .proc_handler = proc_dointvec,
378 .procname = "numa_balancing_scan_period_max_ms",
379 .data = &sysctl_numa_balancing_scan_period_max,
380 .maxlen = sizeof(unsigned int),
382 .proc_handler = proc_dointvec,
385 .procname = "numa_balancing_scan_size_mb",
386 .data = &sysctl_numa_balancing_scan_size,
387 .maxlen = sizeof(unsigned int),
389 .proc_handler = proc_dointvec,
391 #endif /* CONFIG_NUMA_BALANCING */
392 #endif /* CONFIG_SCHED_DEBUG */
394 .procname = "sched_rt_period_us",
395 .data = &sysctl_sched_rt_period,
396 .maxlen = sizeof(unsigned int),
398 .proc_handler = sched_rt_handler,
401 .procname = "sched_rt_runtime_us",
402 .data = &sysctl_sched_rt_runtime,
403 .maxlen = sizeof(int),
405 .proc_handler = sched_rt_handler,
408 .procname = "sched_rr_timeslice_ms",
409 .data = &sched_rr_timeslice,
410 .maxlen = sizeof(int),
412 .proc_handler = sched_rr_handler,
414 #ifdef CONFIG_SCHED_AUTOGROUP
416 .procname = "sched_autogroup_enabled",
417 .data = &sysctl_sched_autogroup_enabled,
418 .maxlen = sizeof(unsigned int),
420 .proc_handler = proc_dointvec_minmax,
425 #ifdef CONFIG_CFS_BANDWIDTH
427 .procname = "sched_cfs_bandwidth_slice_us",
428 .data = &sysctl_sched_cfs_bandwidth_slice,
429 .maxlen = sizeof(unsigned int),
431 .proc_handler = proc_dointvec_minmax,
435 #ifdef CONFIG_PROVE_LOCKING
437 .procname = "prove_locking",
438 .data = &prove_locking,
439 .maxlen = sizeof(int),
441 .proc_handler = proc_dointvec,
444 #ifdef CONFIG_LOCK_STAT
446 .procname = "lock_stat",
448 .maxlen = sizeof(int),
450 .proc_handler = proc_dointvec,
455 .data = &panic_timeout,
456 .maxlen = sizeof(int),
458 .proc_handler = proc_dointvec,
460 #ifdef CONFIG_COREDUMP
462 .procname = "core_uses_pid",
463 .data = &core_uses_pid,
464 .maxlen = sizeof(int),
466 .proc_handler = proc_dointvec,
469 .procname = "core_pattern",
470 .data = core_pattern,
471 .maxlen = CORENAME_MAX_SIZE,
473 .proc_handler = proc_dostring_coredump,
476 .procname = "core_pipe_limit",
477 .data = &core_pipe_limit,
478 .maxlen = sizeof(unsigned int),
480 .proc_handler = proc_dointvec,
483 #ifdef CONFIG_PROC_SYSCTL
485 .procname = "tainted",
486 .maxlen = sizeof(long),
488 .proc_handler = proc_taint,
491 #ifdef CONFIG_LATENCYTOP
493 .procname = "latencytop",
494 .data = &latencytop_enabled,
495 .maxlen = sizeof(int),
497 .proc_handler = proc_dointvec,
500 #ifdef CONFIG_BLK_DEV_INITRD
502 .procname = "real-root-dev",
503 .data = &real_root_dev,
504 .maxlen = sizeof(int),
506 .proc_handler = proc_dointvec,
510 .procname = "print-fatal-signals",
511 .data = &print_fatal_signals,
512 .maxlen = sizeof(int),
514 .proc_handler = proc_dointvec,
518 .procname = "reboot-cmd",
519 .data = reboot_command,
522 .proc_handler = proc_dostring,
525 .procname = "stop-a",
526 .data = &stop_a_enabled,
527 .maxlen = sizeof (int),
529 .proc_handler = proc_dointvec,
532 .procname = "scons-poweroff",
533 .data = &scons_pwroff,
534 .maxlen = sizeof (int),
536 .proc_handler = proc_dointvec,
539 #ifdef CONFIG_SPARC64
541 .procname = "tsb-ratio",
542 .data = &sysctl_tsb_ratio,
543 .maxlen = sizeof (int),
545 .proc_handler = proc_dointvec,
550 .procname = "soft-power",
551 .data = &pwrsw_enabled,
552 .maxlen = sizeof (int),
554 .proc_handler = proc_dointvec,
557 .procname = "unaligned-trap",
558 .data = &unaligned_enabled,
559 .maxlen = sizeof (int),
561 .proc_handler = proc_dointvec,
565 .procname = "ctrl-alt-del",
567 .maxlen = sizeof(int),
569 .proc_handler = proc_dointvec,
571 #ifdef CONFIG_FUNCTION_TRACER
573 .procname = "ftrace_enabled",
574 .data = &ftrace_enabled,
575 .maxlen = sizeof(int),
577 .proc_handler = ftrace_enable_sysctl,
580 #ifdef CONFIG_STACK_TRACER
582 .procname = "stack_tracer_enabled",
583 .data = &stack_tracer_enabled,
584 .maxlen = sizeof(int),
586 .proc_handler = stack_trace_sysctl,
589 #ifdef CONFIG_TRACING
591 .procname = "ftrace_dump_on_oops",
592 .data = &ftrace_dump_on_oops,
593 .maxlen = sizeof(int),
595 .proc_handler = proc_dointvec,
598 #ifdef CONFIG_MODULES
600 .procname = "modprobe",
601 .data = &modprobe_path,
602 .maxlen = KMOD_PATH_LEN,
604 .proc_handler = proc_dostring,
607 .procname = "modules_disabled",
608 .data = &modules_disabled,
609 .maxlen = sizeof(int),
611 /* only handle a transition from default "0" to "1" */
612 .proc_handler = proc_dointvec_minmax,
619 .procname = "hotplug",
620 .data = &uevent_helper,
621 .maxlen = UEVENT_HELPER_PATH_LEN,
623 .proc_handler = proc_dostring,
626 #ifdef CONFIG_CHR_DEV_SG
628 .procname = "sg-big-buff",
629 .data = &sg_big_buff,
630 .maxlen = sizeof (int),
632 .proc_handler = proc_dointvec,
635 #ifdef CONFIG_BSD_PROCESS_ACCT
639 .maxlen = 3*sizeof(int),
641 .proc_handler = proc_dointvec,
644 #ifdef CONFIG_MAGIC_SYSRQ
647 .data = &__sysrq_enabled,
648 .maxlen = sizeof (int),
650 .proc_handler = sysrq_sysctl_handler,
653 #ifdef CONFIG_PROC_SYSCTL
655 .procname = "cad_pid",
657 .maxlen = sizeof (int),
659 .proc_handler = proc_do_cad_pid,
663 .procname = "threads-max",
664 .data = &max_threads,
665 .maxlen = sizeof(int),
667 .proc_handler = proc_dointvec,
670 .procname = "random",
672 .child = random_table,
675 .procname = "usermodehelper",
677 .child = usermodehelper_table,
680 .procname = "overflowuid",
681 .data = &overflowuid,
682 .maxlen = sizeof(int),
684 .proc_handler = proc_dointvec_minmax,
685 .extra1 = &minolduid,
686 .extra2 = &maxolduid,
689 .procname = "overflowgid",
690 .data = &overflowgid,
691 .maxlen = sizeof(int),
693 .proc_handler = proc_dointvec_minmax,
694 .extra1 = &minolduid,
695 .extra2 = &maxolduid,
698 #ifdef CONFIG_MATHEMU
700 .procname = "ieee_emulation_warnings",
701 .data = &sysctl_ieee_emulation_warnings,
702 .maxlen = sizeof(int),
704 .proc_handler = proc_dointvec,
708 .procname = "userprocess_debug",
709 .data = &show_unhandled_signals,
710 .maxlen = sizeof(int),
712 .proc_handler = proc_dointvec,
716 .procname = "pid_max",
718 .maxlen = sizeof (int),
720 .proc_handler = proc_dointvec_minmax,
721 .extra1 = &pid_max_min,
722 .extra2 = &pid_max_max,
725 .procname = "panic_on_oops",
726 .data = &panic_on_oops,
727 .maxlen = sizeof(int),
729 .proc_handler = proc_dointvec,
731 #if defined CONFIG_PRINTK
733 .procname = "printk",
734 .data = &console_loglevel,
735 .maxlen = 4*sizeof(int),
737 .proc_handler = proc_dointvec,
740 .procname = "printk_ratelimit",
741 .data = &printk_ratelimit_state.interval,
742 .maxlen = sizeof(int),
744 .proc_handler = proc_dointvec_jiffies,
747 .procname = "printk_ratelimit_burst",
748 .data = &printk_ratelimit_state.burst,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec,
754 .procname = "printk_delay",
755 .data = &printk_delay_msec,
756 .maxlen = sizeof(int),
758 .proc_handler = proc_dointvec_minmax,
760 .extra2 = &ten_thousand,
763 .procname = "dmesg_restrict",
764 .data = &dmesg_restrict,
765 .maxlen = sizeof(int),
767 .proc_handler = proc_dointvec_minmax_sysadmin,
772 .procname = "kptr_restrict",
773 .data = &kptr_restrict,
774 .maxlen = sizeof(int),
776 .proc_handler = proc_dointvec_minmax_sysadmin,
782 .procname = "ngroups_max",
783 .data = &ngroups_max,
784 .maxlen = sizeof (int),
786 .proc_handler = proc_dointvec,
789 .procname = "cap_last_cap",
790 .data = (void *)&cap_last_cap,
791 .maxlen = sizeof(int),
793 .proc_handler = proc_dointvec,
795 #if defined(CONFIG_LOCKUP_DETECTOR)
797 .procname = "watchdog",
798 .data = &watchdog_enabled,
799 .maxlen = sizeof (int),
801 .proc_handler = proc_dowatchdog,
806 .procname = "watchdog_thresh",
807 .data = &watchdog_thresh,
808 .maxlen = sizeof(int),
810 .proc_handler = proc_dowatchdog,
815 .procname = "softlockup_panic",
816 .data = &softlockup_panic,
817 .maxlen = sizeof(int),
819 .proc_handler = proc_dointvec_minmax,
824 .procname = "nmi_watchdog",
825 .data = &watchdog_enabled,
826 .maxlen = sizeof (int),
828 .proc_handler = proc_dowatchdog,
833 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
835 .procname = "unknown_nmi_panic",
836 .data = &unknown_nmi_panic,
837 .maxlen = sizeof (int),
839 .proc_handler = proc_dointvec,
842 #if defined(CONFIG_X86)
844 .procname = "panic_on_unrecovered_nmi",
845 .data = &panic_on_unrecovered_nmi,
846 .maxlen = sizeof(int),
848 .proc_handler = proc_dointvec,
851 .procname = "panic_on_io_nmi",
852 .data = &panic_on_io_nmi,
853 .maxlen = sizeof(int),
855 .proc_handler = proc_dointvec,
857 #ifdef CONFIG_DEBUG_STACKOVERFLOW
859 .procname = "panic_on_stackoverflow",
860 .data = &sysctl_panic_on_stackoverflow,
861 .maxlen = sizeof(int),
863 .proc_handler = proc_dointvec,
867 .procname = "bootloader_type",
868 .data = &bootloader_type,
869 .maxlen = sizeof (int),
871 .proc_handler = proc_dointvec,
874 .procname = "bootloader_version",
875 .data = &bootloader_version,
876 .maxlen = sizeof (int),
878 .proc_handler = proc_dointvec,
881 .procname = "kstack_depth_to_print",
882 .data = &kstack_depth_to_print,
883 .maxlen = sizeof(int),
885 .proc_handler = proc_dointvec,
888 .procname = "io_delay_type",
889 .data = &io_delay_type,
890 .maxlen = sizeof(int),
892 .proc_handler = proc_dointvec,
895 #if defined(CONFIG_MMU)
897 .procname = "randomize_va_space",
898 .data = &randomize_va_space,
899 .maxlen = sizeof(int),
901 .proc_handler = proc_dointvec,
904 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
906 .procname = "spin_retry",
908 .maxlen = sizeof (int),
910 .proc_handler = proc_dointvec,
913 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
915 .procname = "acpi_video_flags",
916 .data = &acpi_realmode_flags,
917 .maxlen = sizeof (unsigned long),
919 .proc_handler = proc_doulongvec_minmax,
924 .procname = "ignore-unaligned-usertrap",
925 .data = &no_unaligned_warning,
926 .maxlen = sizeof (int),
928 .proc_handler = proc_dointvec,
931 .procname = "unaligned-dump-stack",
932 .data = &unaligned_dump_stack,
933 .maxlen = sizeof (int),
935 .proc_handler = proc_dointvec,
938 #ifdef CONFIG_DETECT_HUNG_TASK
940 .procname = "hung_task_panic",
941 .data = &sysctl_hung_task_panic,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_dointvec_minmax,
949 .procname = "hung_task_check_count",
950 .data = &sysctl_hung_task_check_count,
951 .maxlen = sizeof(unsigned long),
953 .proc_handler = proc_doulongvec_minmax,
956 .procname = "hung_task_timeout_secs",
957 .data = &sysctl_hung_task_timeout_secs,
958 .maxlen = sizeof(unsigned long),
960 .proc_handler = proc_dohung_task_timeout_secs,
963 .procname = "hung_task_warnings",
964 .data = &sysctl_hung_task_warnings,
965 .maxlen = sizeof(unsigned long),
967 .proc_handler = proc_doulongvec_minmax,
972 .procname = "compat-log",
974 .maxlen = sizeof (int),
976 .proc_handler = proc_dointvec,
979 #ifdef CONFIG_RT_MUTEXES
981 .procname = "max_lock_depth",
982 .data = &max_lock_depth,
983 .maxlen = sizeof(int),
985 .proc_handler = proc_dointvec,
989 .procname = "poweroff_cmd",
990 .data = &poweroff_cmd,
991 .maxlen = POWEROFF_CMD_PATH_LEN,
993 .proc_handler = proc_dostring,
999 .child = key_sysctls,
1002 #ifdef CONFIG_RCU_TORTURE_TEST
1004 .procname = "rcutorture_runnable",
1005 .data = &rcutorture_runnable,
1006 .maxlen = sizeof(int),
1008 .proc_handler = proc_dointvec,
1011 #ifdef CONFIG_PERF_EVENTS
1013 * User-space scripts rely on the existence of this file
1014 * as a feature check for perf_events being enabled.
1016 * So it's an ABI, do not remove!
1019 .procname = "perf_event_paranoid",
1020 .data = &sysctl_perf_event_paranoid,
1021 .maxlen = sizeof(sysctl_perf_event_paranoid),
1023 .proc_handler = proc_dointvec,
1026 .procname = "perf_event_mlock_kb",
1027 .data = &sysctl_perf_event_mlock,
1028 .maxlen = sizeof(sysctl_perf_event_mlock),
1030 .proc_handler = proc_dointvec,
1033 .procname = "perf_event_max_sample_rate",
1034 .data = &sysctl_perf_event_sample_rate,
1035 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1037 .proc_handler = perf_proc_update_handler,
1040 #ifdef CONFIG_KMEMCHECK
1042 .procname = "kmemcheck",
1043 .data = &kmemcheck_enabled,
1044 .maxlen = sizeof(int),
1046 .proc_handler = proc_dointvec,
1051 .procname = "blk_iopoll",
1052 .data = &blk_iopoll_enabled,
1053 .maxlen = sizeof(int),
1055 .proc_handler = proc_dointvec,
1061 static struct ctl_table vm_table[] = {
1063 .procname = "overcommit_memory",
1064 .data = &sysctl_overcommit_memory,
1065 .maxlen = sizeof(sysctl_overcommit_memory),
1067 .proc_handler = proc_dointvec_minmax,
1072 .procname = "panic_on_oom",
1073 .data = &sysctl_panic_on_oom,
1074 .maxlen = sizeof(sysctl_panic_on_oom),
1076 .proc_handler = proc_dointvec_minmax,
1081 .procname = "oom_kill_allocating_task",
1082 .data = &sysctl_oom_kill_allocating_task,
1083 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1085 .proc_handler = proc_dointvec,
1088 .procname = "oom_dump_tasks",
1089 .data = &sysctl_oom_dump_tasks,
1090 .maxlen = sizeof(sysctl_oom_dump_tasks),
1092 .proc_handler = proc_dointvec,
1095 .procname = "overcommit_ratio",
1096 .data = &sysctl_overcommit_ratio,
1097 .maxlen = sizeof(sysctl_overcommit_ratio),
1099 .proc_handler = proc_dointvec,
1102 .procname = "page-cluster",
1103 .data = &page_cluster,
1104 .maxlen = sizeof(int),
1106 .proc_handler = proc_dointvec_minmax,
1110 .procname = "dirty_background_ratio",
1111 .data = &dirty_background_ratio,
1112 .maxlen = sizeof(dirty_background_ratio),
1114 .proc_handler = dirty_background_ratio_handler,
1116 .extra2 = &one_hundred,
1119 .procname = "dirty_background_bytes",
1120 .data = &dirty_background_bytes,
1121 .maxlen = sizeof(dirty_background_bytes),
1123 .proc_handler = dirty_background_bytes_handler,
1127 .procname = "dirty_ratio",
1128 .data = &vm_dirty_ratio,
1129 .maxlen = sizeof(vm_dirty_ratio),
1131 .proc_handler = dirty_ratio_handler,
1133 .extra2 = &one_hundred,
1136 .procname = "dirty_bytes",
1137 .data = &vm_dirty_bytes,
1138 .maxlen = sizeof(vm_dirty_bytes),
1140 .proc_handler = dirty_bytes_handler,
1141 .extra1 = &dirty_bytes_min,
1144 .procname = "dirty_writeback_centisecs",
1145 .data = &dirty_writeback_interval,
1146 .maxlen = sizeof(dirty_writeback_interval),
1148 .proc_handler = dirty_writeback_centisecs_handler,
1151 .procname = "dirty_expire_centisecs",
1152 .data = &dirty_expire_interval,
1153 .maxlen = sizeof(dirty_expire_interval),
1155 .proc_handler = proc_dointvec_minmax,
1159 .procname = "nr_pdflush_threads",
1160 .mode = 0444 /* read-only */,
1161 .proc_handler = pdflush_proc_obsolete,
1164 .procname = "swappiness",
1165 .data = &vm_swappiness,
1166 .maxlen = sizeof(vm_swappiness),
1168 .proc_handler = proc_dointvec_minmax,
1170 .extra2 = &one_hundred,
1172 #ifdef CONFIG_HUGETLB_PAGE
1174 .procname = "nr_hugepages",
1176 .maxlen = sizeof(unsigned long),
1178 .proc_handler = hugetlb_sysctl_handler,
1179 .extra1 = (void *)&hugetlb_zero,
1180 .extra2 = (void *)&hugetlb_infinity,
1184 .procname = "nr_hugepages_mempolicy",
1186 .maxlen = sizeof(unsigned long),
1188 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1189 .extra1 = (void *)&hugetlb_zero,
1190 .extra2 = (void *)&hugetlb_infinity,
1194 .procname = "hugetlb_shm_group",
1195 .data = &sysctl_hugetlb_shm_group,
1196 .maxlen = sizeof(gid_t),
1198 .proc_handler = proc_dointvec,
1201 .procname = "hugepages_treat_as_movable",
1202 .data = &hugepages_treat_as_movable,
1203 .maxlen = sizeof(int),
1205 .proc_handler = hugetlb_treat_movable_handler,
1208 .procname = "nr_overcommit_hugepages",
1210 .maxlen = sizeof(unsigned long),
1212 .proc_handler = hugetlb_overcommit_handler,
1213 .extra1 = (void *)&hugetlb_zero,
1214 .extra2 = (void *)&hugetlb_infinity,
1218 .procname = "lowmem_reserve_ratio",
1219 .data = &sysctl_lowmem_reserve_ratio,
1220 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1222 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1225 .procname = "drop_caches",
1226 .data = &sysctl_drop_caches,
1227 .maxlen = sizeof(int),
1229 .proc_handler = drop_caches_sysctl_handler,
1233 #ifdef CONFIG_COMPACTION
1235 .procname = "compact_memory",
1236 .data = &sysctl_compact_memory,
1237 .maxlen = sizeof(int),
1239 .proc_handler = sysctl_compaction_handler,
1242 .procname = "extfrag_threshold",
1243 .data = &sysctl_extfrag_threshold,
1244 .maxlen = sizeof(int),
1246 .proc_handler = sysctl_extfrag_handler,
1247 .extra1 = &min_extfrag_threshold,
1248 .extra2 = &max_extfrag_threshold,
1251 #endif /* CONFIG_COMPACTION */
1253 .procname = "min_free_kbytes",
1254 .data = &min_free_kbytes,
1255 .maxlen = sizeof(min_free_kbytes),
1257 .proc_handler = min_free_kbytes_sysctl_handler,
1261 .procname = "percpu_pagelist_fraction",
1262 .data = &percpu_pagelist_fraction,
1263 .maxlen = sizeof(percpu_pagelist_fraction),
1265 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1266 .extra1 = &min_percpu_pagelist_fract,
1270 .procname = "max_map_count",
1271 .data = &sysctl_max_map_count,
1272 .maxlen = sizeof(sysctl_max_map_count),
1274 .proc_handler = proc_dointvec_minmax,
1279 .procname = "nr_trim_pages",
1280 .data = &sysctl_nr_trim_pages,
1281 .maxlen = sizeof(sysctl_nr_trim_pages),
1283 .proc_handler = proc_dointvec_minmax,
1288 .procname = "laptop_mode",
1289 .data = &laptop_mode,
1290 .maxlen = sizeof(laptop_mode),
1292 .proc_handler = proc_dointvec_jiffies,
1295 .procname = "block_dump",
1296 .data = &block_dump,
1297 .maxlen = sizeof(block_dump),
1299 .proc_handler = proc_dointvec,
1303 .procname = "vfs_cache_pressure",
1304 .data = &sysctl_vfs_cache_pressure,
1305 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1307 .proc_handler = proc_dointvec,
1310 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1312 .procname = "legacy_va_layout",
1313 .data = &sysctl_legacy_va_layout,
1314 .maxlen = sizeof(sysctl_legacy_va_layout),
1316 .proc_handler = proc_dointvec,
1322 .procname = "zone_reclaim_mode",
1323 .data = &zone_reclaim_mode,
1324 .maxlen = sizeof(zone_reclaim_mode),
1326 .proc_handler = proc_dointvec,
1330 .procname = "min_unmapped_ratio",
1331 .data = &sysctl_min_unmapped_ratio,
1332 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1334 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1336 .extra2 = &one_hundred,
1339 .procname = "min_slab_ratio",
1340 .data = &sysctl_min_slab_ratio,
1341 .maxlen = sizeof(sysctl_min_slab_ratio),
1343 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1345 .extra2 = &one_hundred,
1350 .procname = "stat_interval",
1351 .data = &sysctl_stat_interval,
1352 .maxlen = sizeof(sysctl_stat_interval),
1354 .proc_handler = proc_dointvec_jiffies,
1359 .procname = "mmap_min_addr",
1360 .data = &dac_mmap_min_addr,
1361 .maxlen = sizeof(unsigned long),
1363 .proc_handler = mmap_min_addr_handler,
1368 .procname = "numa_zonelist_order",
1369 .data = &numa_zonelist_order,
1370 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1372 .proc_handler = numa_zonelist_order_handler,
1375 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1376 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1378 .procname = "vdso_enabled",
1379 .data = &vdso_enabled,
1380 .maxlen = sizeof(vdso_enabled),
1382 .proc_handler = proc_dointvec,
1386 #ifdef CONFIG_HIGHMEM
1388 .procname = "highmem_is_dirtyable",
1389 .data = &vm_highmem_is_dirtyable,
1390 .maxlen = sizeof(vm_highmem_is_dirtyable),
1392 .proc_handler = proc_dointvec_minmax,
1398 .procname = "scan_unevictable_pages",
1399 .data = &scan_unevictable_pages,
1400 .maxlen = sizeof(scan_unevictable_pages),
1402 .proc_handler = scan_unevictable_handler,
1404 #ifdef CONFIG_MEMORY_FAILURE
1406 .procname = "memory_failure_early_kill",
1407 .data = &sysctl_memory_failure_early_kill,
1408 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1410 .proc_handler = proc_dointvec_minmax,
1415 .procname = "memory_failure_recovery",
1416 .data = &sysctl_memory_failure_recovery,
1417 .maxlen = sizeof(sysctl_memory_failure_recovery),
1419 .proc_handler = proc_dointvec_minmax,
1427 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1428 static struct ctl_table binfmt_misc_table[] = {
1433 static struct ctl_table fs_table[] = {
1435 .procname = "inode-nr",
1436 .data = &inodes_stat,
1437 .maxlen = 2*sizeof(int),
1439 .proc_handler = proc_nr_inodes,
1442 .procname = "inode-state",
1443 .data = &inodes_stat,
1444 .maxlen = 7*sizeof(int),
1446 .proc_handler = proc_nr_inodes,
1449 .procname = "file-nr",
1450 .data = &files_stat,
1451 .maxlen = sizeof(files_stat),
1453 .proc_handler = proc_nr_files,
1456 .procname = "file-max",
1457 .data = &files_stat.max_files,
1458 .maxlen = sizeof(files_stat.max_files),
1460 .proc_handler = proc_doulongvec_minmax,
1463 .procname = "nr_open",
1464 .data = &sysctl_nr_open,
1465 .maxlen = sizeof(int),
1467 .proc_handler = proc_dointvec_minmax,
1468 .extra1 = &sysctl_nr_open_min,
1469 .extra2 = &sysctl_nr_open_max,
1472 .procname = "dentry-state",
1473 .data = &dentry_stat,
1474 .maxlen = 6*sizeof(int),
1476 .proc_handler = proc_nr_dentry,
1479 .procname = "overflowuid",
1480 .data = &fs_overflowuid,
1481 .maxlen = sizeof(int),
1483 .proc_handler = proc_dointvec_minmax,
1484 .extra1 = &minolduid,
1485 .extra2 = &maxolduid,
1488 .procname = "overflowgid",
1489 .data = &fs_overflowgid,
1490 .maxlen = sizeof(int),
1492 .proc_handler = proc_dointvec_minmax,
1493 .extra1 = &minolduid,
1494 .extra2 = &maxolduid,
1496 #ifdef CONFIG_FILE_LOCKING
1498 .procname = "leases-enable",
1499 .data = &leases_enable,
1500 .maxlen = sizeof(int),
1502 .proc_handler = proc_dointvec,
1505 #ifdef CONFIG_DNOTIFY
1507 .procname = "dir-notify-enable",
1508 .data = &dir_notify_enable,
1509 .maxlen = sizeof(int),
1511 .proc_handler = proc_dointvec,
1515 #ifdef CONFIG_FILE_LOCKING
1517 .procname = "lease-break-time",
1518 .data = &lease_break_time,
1519 .maxlen = sizeof(int),
1521 .proc_handler = proc_dointvec,
1526 .procname = "aio-nr",
1528 .maxlen = sizeof(aio_nr),
1530 .proc_handler = proc_doulongvec_minmax,
1533 .procname = "aio-max-nr",
1534 .data = &aio_max_nr,
1535 .maxlen = sizeof(aio_max_nr),
1537 .proc_handler = proc_doulongvec_minmax,
1539 #endif /* CONFIG_AIO */
1540 #ifdef CONFIG_INOTIFY_USER
1542 .procname = "inotify",
1544 .child = inotify_table,
1549 .procname = "epoll",
1551 .child = epoll_table,
1556 .procname = "protected_symlinks",
1557 .data = &sysctl_protected_symlinks,
1558 .maxlen = sizeof(int),
1560 .proc_handler = proc_dointvec_minmax,
1565 .procname = "protected_hardlinks",
1566 .data = &sysctl_protected_hardlinks,
1567 .maxlen = sizeof(int),
1569 .proc_handler = proc_dointvec_minmax,
1574 .procname = "suid_dumpable",
1575 .data = &suid_dumpable,
1576 .maxlen = sizeof(int),
1578 .proc_handler = proc_dointvec_minmax_coredump,
1582 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1584 .procname = "binfmt_misc",
1586 .child = binfmt_misc_table,
1590 .procname = "pipe-max-size",
1591 .data = &pipe_max_size,
1592 .maxlen = sizeof(int),
1594 .proc_handler = &pipe_proc_fn,
1595 .extra1 = &pipe_min_size,
1600 static struct ctl_table debug_table[] = {
1601 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1603 .procname = "exception-trace",
1604 .data = &show_unhandled_signals,
1605 .maxlen = sizeof(int),
1607 .proc_handler = proc_dointvec
1610 #if defined(CONFIG_OPTPROBES)
1612 .procname = "kprobes-optimization",
1613 .data = &sysctl_kprobes_optimization,
1614 .maxlen = sizeof(int),
1616 .proc_handler = proc_kprobes_optimization_handler,
1624 static struct ctl_table dev_table[] = {
1628 int __init sysctl_init(void)
1630 struct ctl_table_header *hdr;
1632 hdr = register_sysctl_table(sysctl_base_table);
1633 kmemleak_not_leak(hdr);
1637 #endif /* CONFIG_SYSCTL */
1643 #ifdef CONFIG_PROC_SYSCTL
1645 static int _proc_do_string(void* data, int maxlen, int write,
1646 void __user *buffer,
1647 size_t *lenp, loff_t *ppos)
1653 if (!data || !maxlen || !*lenp) {
1661 while (len < *lenp) {
1662 if (get_user(c, p++))
1664 if (c == 0 || c == '\n')
1670 if(copy_from_user(data, buffer, len))
1672 ((char *) data)[len] = 0;
1690 if(copy_to_user(buffer, data, len))
1693 if(put_user('\n', ((char __user *) buffer) + len))
1704 * proc_dostring - read a string sysctl
1705 * @table: the sysctl table
1706 * @write: %TRUE if this is a write to the sysctl file
1707 * @buffer: the user buffer
1708 * @lenp: the size of the user buffer
1709 * @ppos: file position
1711 * Reads/writes a string from/to the user buffer. If the kernel
1712 * buffer provided is not large enough to hold the string, the
1713 * string is truncated. The copied string is %NULL-terminated.
1714 * If the string is being read by the user process, it is copied
1715 * and a newline '\n' is added. It is truncated if the buffer is
1718 * Returns 0 on success.
1720 int proc_dostring(struct ctl_table *table, int write,
1721 void __user *buffer, size_t *lenp, loff_t *ppos)
1723 return _proc_do_string(table->data, table->maxlen, write,
1724 buffer, lenp, ppos);
1727 static size_t proc_skip_spaces(char **buf)
1730 char *tmp = skip_spaces(*buf);
1736 static void proc_skip_char(char **buf, size_t *size, const char v)
1746 #define TMPBUFLEN 22
1748 * proc_get_long - reads an ASCII formatted integer from a user buffer
1750 * @buf: a kernel buffer
1751 * @size: size of the kernel buffer
1752 * @val: this is where the number will be stored
1753 * @neg: set to %TRUE if number is negative
1754 * @perm_tr: a vector which contains the allowed trailers
1755 * @perm_tr_len: size of the perm_tr vector
1756 * @tr: pointer to store the trailer character
1758 * In case of success %0 is returned and @buf and @size are updated with
1759 * the amount of bytes read. If @tr is non-NULL and a trailing
1760 * character exists (size is non-zero after returning from this
1761 * function), @tr is updated with the trailing character.
1763 static int proc_get_long(char **buf, size_t *size,
1764 unsigned long *val, bool *neg,
1765 const char *perm_tr, unsigned perm_tr_len, char *tr)
1768 char *p, tmp[TMPBUFLEN];
1774 if (len > TMPBUFLEN - 1)
1775 len = TMPBUFLEN - 1;
1777 memcpy(tmp, *buf, len);
1781 if (*p == '-' && *size > 1) {
1789 *val = simple_strtoul(p, &p, 0);
1793 /* We don't know if the next char is whitespace thus we may accept
1794 * invalid integers (e.g. 1234...a) or two integers instead of one
1795 * (e.g. 123...1). So lets not allow such large numbers. */
1796 if (len == TMPBUFLEN - 1)
1799 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1802 if (tr && (len < *size))
1812 * proc_put_long - converts an integer to a decimal ASCII formatted string
1814 * @buf: the user buffer
1815 * @size: the size of the user buffer
1816 * @val: the integer to be converted
1817 * @neg: sign of the number, %TRUE for negative
1819 * In case of success %0 is returned and @buf and @size are updated with
1820 * the amount of bytes written.
1822 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1826 char tmp[TMPBUFLEN], *p = tmp;
1828 sprintf(p, "%s%lu", neg ? "-" : "", val);
1832 if (copy_to_user(*buf, tmp, len))
1840 static int proc_put_char(void __user **buf, size_t *size, char c)
1843 char __user **buffer = (char __user **)buf;
1844 if (put_user(c, *buffer))
1846 (*size)--, (*buffer)++;
1852 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1854 int write, void *data)
1857 *valp = *negp ? -*lvalp : *lvalp;
1862 *lvalp = (unsigned long)-val;
1865 *lvalp = (unsigned long)val;
1871 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1873 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1874 int write, void __user *buffer,
1875 size_t *lenp, loff_t *ppos,
1876 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1877 int write, void *data),
1880 int *i, vleft, first = 1, err = 0;
1881 unsigned long page = 0;
1885 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1890 i = (int *) tbl_data;
1891 vleft = table->maxlen / sizeof(*i);
1895 conv = do_proc_dointvec_conv;
1898 if (left > PAGE_SIZE - 1)
1899 left = PAGE_SIZE - 1;
1900 page = __get_free_page(GFP_TEMPORARY);
1901 kbuf = (char *) page;
1904 if (copy_from_user(kbuf, buffer, left)) {
1911 for (; left && vleft--; i++, first=0) {
1916 left -= proc_skip_spaces(&kbuf);
1920 err = proc_get_long(&kbuf, &left, &lval, &neg,
1922 sizeof(proc_wspace_sep), NULL);
1925 if (conv(&neg, &lval, i, 1, data)) {
1930 if (conv(&neg, &lval, i, 0, data)) {
1935 err = proc_put_char(&buffer, &left, '\t');
1938 err = proc_put_long(&buffer, &left, lval, neg);
1944 if (!write && !first && left && !err)
1945 err = proc_put_char(&buffer, &left, '\n');
1946 if (write && !err && left)
1947 left -= proc_skip_spaces(&kbuf);
1952 return err ? : -EINVAL;
1959 static int do_proc_dointvec(struct ctl_table *table, int write,
1960 void __user *buffer, size_t *lenp, loff_t *ppos,
1961 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1962 int write, void *data),
1965 return __do_proc_dointvec(table->data, table, write,
1966 buffer, lenp, ppos, conv, data);
1970 * proc_dointvec - read a vector of integers
1971 * @table: the sysctl table
1972 * @write: %TRUE if this is a write to the sysctl file
1973 * @buffer: the user buffer
1974 * @lenp: the size of the user buffer
1975 * @ppos: file position
1977 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1978 * values from/to the user buffer, treated as an ASCII string.
1980 * Returns 0 on success.
1982 int proc_dointvec(struct ctl_table *table, int write,
1983 void __user *buffer, size_t *lenp, loff_t *ppos)
1985 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1990 * Taint values can only be increased
1991 * This means we can safely use a temporary.
1993 static int proc_taint(struct ctl_table *table, int write,
1994 void __user *buffer, size_t *lenp, loff_t *ppos)
1997 unsigned long tmptaint = get_taint();
2000 if (write && !capable(CAP_SYS_ADMIN))
2005 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2011 * Poor man's atomic or. Not worth adding a primitive
2012 * to everyone's atomic.h for this
2015 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2016 if ((tmptaint >> i) & 1)
2024 #ifdef CONFIG_PRINTK
2025 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2026 void __user *buffer, size_t *lenp, loff_t *ppos)
2028 if (write && !capable(CAP_SYS_ADMIN))
2031 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2035 struct do_proc_dointvec_minmax_conv_param {
2040 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2042 int write, void *data)
2044 struct do_proc_dointvec_minmax_conv_param *param = data;
2046 int val = *negp ? -*lvalp : *lvalp;
2047 if ((param->min && *param->min > val) ||
2048 (param->max && *param->max < val))
2055 *lvalp = (unsigned long)-val;
2058 *lvalp = (unsigned long)val;
2065 * proc_dointvec_minmax - read a vector of integers with min/max values
2066 * @table: the sysctl table
2067 * @write: %TRUE if this is a write to the sysctl file
2068 * @buffer: the user buffer
2069 * @lenp: the size of the user buffer
2070 * @ppos: file position
2072 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2073 * values from/to the user buffer, treated as an ASCII string.
2075 * This routine will ensure the values are within the range specified by
2076 * table->extra1 (min) and table->extra2 (max).
2078 * Returns 0 on success.
2080 int proc_dointvec_minmax(struct ctl_table *table, int write,
2081 void __user *buffer, size_t *lenp, loff_t *ppos)
2083 struct do_proc_dointvec_minmax_conv_param param = {
2084 .min = (int *) table->extra1,
2085 .max = (int *) table->extra2,
2087 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2088 do_proc_dointvec_minmax_conv, ¶m);
2091 static void validate_coredump_safety(void)
2093 #ifdef CONFIG_COREDUMP
2094 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2095 core_pattern[0] != '/' && core_pattern[0] != '|') {
2096 printk(KERN_WARNING "Unsafe core_pattern used with "\
2097 "suid_dumpable=2. Pipe handler or fully qualified "\
2098 "core dump path required.\n");
2103 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2104 void __user *buffer, size_t *lenp, loff_t *ppos)
2106 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2108 validate_coredump_safety();
2112 #ifdef CONFIG_COREDUMP
2113 static int proc_dostring_coredump(struct ctl_table *table, int write,
2114 void __user *buffer, size_t *lenp, loff_t *ppos)
2116 int error = proc_dostring(table, write, buffer, lenp, ppos);
2118 validate_coredump_safety();
2123 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2124 void __user *buffer,
2125 size_t *lenp, loff_t *ppos,
2126 unsigned long convmul,
2127 unsigned long convdiv)
2129 unsigned long *i, *min, *max;
2130 int vleft, first = 1, err = 0;
2131 unsigned long page = 0;
2135 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2140 i = (unsigned long *) data;
2141 min = (unsigned long *) table->extra1;
2142 max = (unsigned long *) table->extra2;
2143 vleft = table->maxlen / sizeof(unsigned long);
2147 if (left > PAGE_SIZE - 1)
2148 left = PAGE_SIZE - 1;
2149 page = __get_free_page(GFP_TEMPORARY);
2150 kbuf = (char *) page;
2153 if (copy_from_user(kbuf, buffer, left)) {
2160 for (; left && vleft--; i++, first = 0) {
2166 left -= proc_skip_spaces(&kbuf);
2168 err = proc_get_long(&kbuf, &left, &val, &neg,
2170 sizeof(proc_wspace_sep), NULL);
2175 if ((min && val < *min) || (max && val > *max))
2179 val = convdiv * (*i) / convmul;
2181 err = proc_put_char(&buffer, &left, '\t');
2182 err = proc_put_long(&buffer, &left, val, false);
2188 if (!write && !first && left && !err)
2189 err = proc_put_char(&buffer, &left, '\n');
2191 left -= proc_skip_spaces(&kbuf);
2196 return err ? : -EINVAL;
2203 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2204 void __user *buffer,
2205 size_t *lenp, loff_t *ppos,
2206 unsigned long convmul,
2207 unsigned long convdiv)
2209 return __do_proc_doulongvec_minmax(table->data, table, write,
2210 buffer, lenp, ppos, convmul, convdiv);
2214 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2215 * @table: the sysctl table
2216 * @write: %TRUE if this is a write to the sysctl file
2217 * @buffer: the user buffer
2218 * @lenp: the size of the user buffer
2219 * @ppos: file position
2221 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2222 * values from/to the user buffer, treated as an ASCII string.
2224 * This routine will ensure the values are within the range specified by
2225 * table->extra1 (min) and table->extra2 (max).
2227 * Returns 0 on success.
2229 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2232 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2236 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2237 * @table: the sysctl table
2238 * @write: %TRUE if this is a write to the sysctl file
2239 * @buffer: the user buffer
2240 * @lenp: the size of the user buffer
2241 * @ppos: file position
2243 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2244 * values from/to the user buffer, treated as an ASCII string. The values
2245 * are treated as milliseconds, and converted to jiffies when they are stored.
2247 * This routine will ensure the values are within the range specified by
2248 * table->extra1 (min) and table->extra2 (max).
2250 * Returns 0 on success.
2252 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2253 void __user *buffer,
2254 size_t *lenp, loff_t *ppos)
2256 return do_proc_doulongvec_minmax(table, write, buffer,
2257 lenp, ppos, HZ, 1000l);
2261 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2263 int write, void *data)
2266 if (*lvalp > LONG_MAX / HZ)
2268 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2274 lval = (unsigned long)-val;
2277 lval = (unsigned long)val;
2284 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2286 int write, void *data)
2289 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2291 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2297 lval = (unsigned long)-val;
2300 lval = (unsigned long)val;
2302 *lvalp = jiffies_to_clock_t(lval);
2307 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2309 int write, void *data)
2312 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2318 lval = (unsigned long)-val;
2321 lval = (unsigned long)val;
2323 *lvalp = jiffies_to_msecs(lval);
2329 * proc_dointvec_jiffies - read a vector of integers as seconds
2330 * @table: the sysctl table
2331 * @write: %TRUE if this is a write to the sysctl file
2332 * @buffer: the user buffer
2333 * @lenp: the size of the user buffer
2334 * @ppos: file position
2336 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2337 * values from/to the user buffer, treated as an ASCII string.
2338 * The values read are assumed to be in seconds, and are converted into
2341 * Returns 0 on success.
2343 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos)
2346 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2347 do_proc_dointvec_jiffies_conv,NULL);
2351 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2352 * @table: the sysctl table
2353 * @write: %TRUE if this is a write to the sysctl file
2354 * @buffer: the user buffer
2355 * @lenp: the size of the user buffer
2356 * @ppos: pointer to the file position
2358 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2359 * values from/to the user buffer, treated as an ASCII string.
2360 * The values read are assumed to be in 1/USER_HZ seconds, and
2361 * are converted into jiffies.
2363 * Returns 0 on success.
2365 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2366 void __user *buffer, size_t *lenp, loff_t *ppos)
2368 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2369 do_proc_dointvec_userhz_jiffies_conv,NULL);
2373 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2374 * @table: the sysctl table
2375 * @write: %TRUE if this is a write to the sysctl file
2376 * @buffer: the user buffer
2377 * @lenp: the size of the user buffer
2378 * @ppos: file position
2379 * @ppos: the current position in the file
2381 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2382 * values from/to the user buffer, treated as an ASCII string.
2383 * The values read are assumed to be in 1/1000 seconds, and
2384 * are converted into jiffies.
2386 * Returns 0 on success.
2388 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2389 void __user *buffer, size_t *lenp, loff_t *ppos)
2391 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2392 do_proc_dointvec_ms_jiffies_conv, NULL);
2395 static int proc_do_cad_pid(struct ctl_table *table, int write,
2396 void __user *buffer, size_t *lenp, loff_t *ppos)
2398 struct pid *new_pid;
2402 tmp = pid_vnr(cad_pid);
2404 r = __do_proc_dointvec(&tmp, table, write, buffer,
2405 lenp, ppos, NULL, NULL);
2409 new_pid = find_get_pid(tmp);
2413 put_pid(xchg(&cad_pid, new_pid));
2418 * proc_do_large_bitmap - read/write from/to a large bitmap
2419 * @table: the sysctl table
2420 * @write: %TRUE if this is a write to the sysctl file
2421 * @buffer: the user buffer
2422 * @lenp: the size of the user buffer
2423 * @ppos: file position
2425 * The bitmap is stored at table->data and the bitmap length (in bits)
2428 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2429 * large bitmaps may be represented in a compact manner. Writing into
2430 * the file will clear the bitmap then update it with the given input.
2432 * Returns 0 on success.
2434 int proc_do_large_bitmap(struct ctl_table *table, int write,
2435 void __user *buffer, size_t *lenp, loff_t *ppos)
2439 size_t left = *lenp;
2440 unsigned long bitmap_len = table->maxlen;
2441 unsigned long *bitmap = (unsigned long *) table->data;
2442 unsigned long *tmp_bitmap = NULL;
2443 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2445 if (!bitmap_len || !left || (*ppos && !write)) {
2451 unsigned long page = 0;
2454 if (left > PAGE_SIZE - 1)
2455 left = PAGE_SIZE - 1;
2457 page = __get_free_page(GFP_TEMPORARY);
2458 kbuf = (char *) page;
2461 if (copy_from_user(kbuf, buffer, left)) {
2467 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2473 proc_skip_char(&kbuf, &left, '\n');
2474 while (!err && left) {
2475 unsigned long val_a, val_b;
2478 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2482 if (val_a >= bitmap_len || neg) {
2494 err = proc_get_long(&kbuf, &left, &val_b,
2495 &neg, tr_b, sizeof(tr_b),
2499 if (val_b >= bitmap_len || neg ||
2510 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2512 proc_skip_char(&kbuf, &left, '\n');
2516 unsigned long bit_a, bit_b = 0;
2519 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2520 if (bit_a >= bitmap_len)
2522 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2526 err = proc_put_char(&buffer, &left, ',');
2530 err = proc_put_long(&buffer, &left, bit_a, false);
2533 if (bit_a != bit_b) {
2534 err = proc_put_char(&buffer, &left, '-');
2537 err = proc_put_long(&buffer, &left, bit_b, false);
2545 err = proc_put_char(&buffer, &left, '\n');
2551 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2553 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2565 #else /* CONFIG_PROC_SYSCTL */
2567 int proc_dostring(struct ctl_table *table, int write,
2568 void __user *buffer, size_t *lenp, loff_t *ppos)
2573 int proc_dointvec(struct ctl_table *table, int write,
2574 void __user *buffer, size_t *lenp, loff_t *ppos)
2579 int proc_dointvec_minmax(struct ctl_table *table, int write,
2580 void __user *buffer, size_t *lenp, loff_t *ppos)
2585 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2586 void __user *buffer, size_t *lenp, loff_t *ppos)
2591 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2592 void __user *buffer, size_t *lenp, loff_t *ppos)
2597 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2603 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2604 void __user *buffer, size_t *lenp, loff_t *ppos)
2609 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2610 void __user *buffer,
2611 size_t *lenp, loff_t *ppos)
2617 #endif /* CONFIG_PROC_SYSCTL */
2620 * No sense putting this after each symbol definition, twice,
2621 * exception granted :-)
2623 EXPORT_SYMBOL(proc_dointvec);
2624 EXPORT_SYMBOL(proc_dointvec_jiffies);
2625 EXPORT_SYMBOL(proc_dointvec_minmax);
2626 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2627 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2628 EXPORT_SYMBOL(proc_dostring);
2629 EXPORT_SYMBOL(proc_doulongvec_minmax);
2630 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);