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>
34 #include <linux/init.h>
35 #include <linux/kernel.h>
36 #include <linux/kobject.h>
37 #include <linux/net.h>
38 #include <linux/sysrq.h>
39 #include <linux/highuid.h>
40 #include <linux/writeback.h>
41 #include <linux/ratelimit.h>
42 #include <linux/compaction.h>
43 #include <linux/hugetlb.h>
44 #include <linux/initrd.h>
45 #include <linux/key.h>
46 #include <linux/times.h>
47 #include <linux/limits.h>
48 #include <linux/dcache.h>
49 #include <linux/dnotify.h>
50 #include <linux/syscalls.h>
51 #include <linux/vmstat.h>
52 #include <linux/nfs_fs.h>
53 #include <linux/acpi.h>
54 #include <linux/reboot.h>
55 #include <linux/ftrace.h>
56 #include <linux/perf_event.h>
57 #include <linux/kprobes.h>
58 #include <linux/pipe_fs_i.h>
59 #include <linux/oom.h>
60 #include <linux/kmod.h>
61 #include <linux/capability.h>
62 #include <linux/binfmts.h>
64 #include <asm/uaccess.h>
65 #include <asm/processor.h>
69 #include <asm/stacktrace.h>
73 #include <asm/setup.h>
75 #ifdef CONFIG_BSD_PROCESS_ACCT
76 #include <linux/acct.h>
78 #ifdef CONFIG_RT_MUTEXES
79 #include <linux/rtmutex.h>
81 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
82 #include <linux/lockdep.h>
84 #ifdef CONFIG_CHR_DEV_SG
88 #ifdef CONFIG_LOCKUP_DETECTOR
89 #include <linux/nmi.h>
93 #if defined(CONFIG_SYSCTL)
95 /* External variables not in a header file. */
96 extern int sysctl_overcommit_memory;
97 extern int sysctl_overcommit_ratio;
98 extern int max_threads;
99 extern int core_uses_pid;
100 extern int suid_dumpable;
101 extern char core_pattern[];
102 extern unsigned int core_pipe_limit;
104 extern int min_free_kbytes;
105 extern int pid_max_min, pid_max_max;
106 extern int sysctl_drop_caches;
107 extern int percpu_pagelist_fraction;
108 extern int compat_log;
109 extern int latencytop_enabled;
110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 extern int sysctl_nr_trim_pages;
115 extern int blk_iopoll_enabled;
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty = 60;
121 static int neg_one = -1;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused three = 3;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
131 static int ten_thousand = 10000;
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid = 65535;
139 static int minolduid;
140 static int min_percpu_pagelist_fract = 8;
142 static int ngroups_max = NGROUPS_MAX;
143 static const int cap_last_cap = CAP_LAST_CAP;
145 #ifdef CONFIG_INOTIFY_USER
146 #include <linux/inotify.h>
151 #ifdef CONFIG_SPARC64
152 extern int sysctl_tsb_ratio;
156 extern int pwrsw_enabled;
157 extern int unaligned_enabled;
161 extern int no_unaligned_warning;
162 extern int unaligned_dump_stack;
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168 static int proc_taint(struct ctl_table *table, int write,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
173 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
177 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
179 static int proc_dostring_coredump(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
182 #ifdef CONFIG_MAGIC_SYSRQ
183 /* Note: sysrq code uses it's own private copy */
184 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
186 static int sysrq_sysctl_handler(ctl_table *table, int write,
187 void __user *buffer, size_t *lenp,
192 error = proc_dointvec(table, write, buffer, lenp, ppos);
197 sysrq_toggle_support(__sysrq_enabled);
204 static struct ctl_table kern_table[];
205 static struct ctl_table vm_table[];
206 static struct ctl_table fs_table[];
207 static struct ctl_table debug_table[];
208 static struct ctl_table dev_table[];
209 extern struct ctl_table random_table[];
211 extern struct ctl_table epoll_table[];
214 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
215 int sysctl_legacy_va_layout;
218 /* The default sysctl tables: */
220 static struct ctl_table sysctl_base_table[] = {
222 .procname = "kernel",
239 .child = debug_table,
249 #ifdef CONFIG_SCHED_DEBUG
250 static int min_sched_granularity_ns = 100000; /* 100 usecs */
251 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
252 static int min_wakeup_granularity_ns; /* 0 usecs */
253 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
254 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
255 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
258 #ifdef CONFIG_COMPACTION
259 static int min_extfrag_threshold;
260 static int max_extfrag_threshold = 1000;
263 static struct ctl_table kern_table[] = {
265 .procname = "sched_child_runs_first",
266 .data = &sysctl_sched_child_runs_first,
267 .maxlen = sizeof(unsigned int),
269 .proc_handler = proc_dointvec,
271 #ifdef CONFIG_SCHED_DEBUG
273 .procname = "sched_min_granularity_ns",
274 .data = &sysctl_sched_min_granularity,
275 .maxlen = sizeof(unsigned int),
277 .proc_handler = sched_proc_update_handler,
278 .extra1 = &min_sched_granularity_ns,
279 .extra2 = &max_sched_granularity_ns,
282 .procname = "sched_latency_ns",
283 .data = &sysctl_sched_latency,
284 .maxlen = sizeof(unsigned int),
286 .proc_handler = sched_proc_update_handler,
287 .extra1 = &min_sched_granularity_ns,
288 .extra2 = &max_sched_granularity_ns,
291 .procname = "sched_wakeup_granularity_ns",
292 .data = &sysctl_sched_wakeup_granularity,
293 .maxlen = sizeof(unsigned int),
295 .proc_handler = sched_proc_update_handler,
296 .extra1 = &min_wakeup_granularity_ns,
297 .extra2 = &max_wakeup_granularity_ns,
300 .procname = "sched_tunable_scaling",
301 .data = &sysctl_sched_tunable_scaling,
302 .maxlen = sizeof(enum sched_tunable_scaling),
304 .proc_handler = sched_proc_update_handler,
305 .extra1 = &min_sched_tunable_scaling,
306 .extra2 = &max_sched_tunable_scaling,
309 .procname = "sched_migration_cost",
310 .data = &sysctl_sched_migration_cost,
311 .maxlen = sizeof(unsigned int),
313 .proc_handler = proc_dointvec,
316 .procname = "sched_nr_migrate",
317 .data = &sysctl_sched_nr_migrate,
318 .maxlen = sizeof(unsigned int),
320 .proc_handler = proc_dointvec,
323 .procname = "sched_time_avg",
324 .data = &sysctl_sched_time_avg,
325 .maxlen = sizeof(unsigned int),
327 .proc_handler = proc_dointvec,
330 .procname = "sched_shares_window",
331 .data = &sysctl_sched_shares_window,
332 .maxlen = sizeof(unsigned int),
334 .proc_handler = proc_dointvec,
337 .procname = "timer_migration",
338 .data = &sysctl_timer_migration,
339 .maxlen = sizeof(unsigned int),
341 .proc_handler = proc_dointvec_minmax,
347 .procname = "sched_rt_period_us",
348 .data = &sysctl_sched_rt_period,
349 .maxlen = sizeof(unsigned int),
351 .proc_handler = sched_rt_handler,
354 .procname = "sched_rt_runtime_us",
355 .data = &sysctl_sched_rt_runtime,
356 .maxlen = sizeof(int),
358 .proc_handler = sched_rt_handler,
360 #ifdef CONFIG_SCHED_AUTOGROUP
362 .procname = "sched_autogroup_enabled",
363 .data = &sysctl_sched_autogroup_enabled,
364 .maxlen = sizeof(unsigned int),
366 .proc_handler = proc_dointvec_minmax,
371 #ifdef CONFIG_CFS_BANDWIDTH
373 .procname = "sched_cfs_bandwidth_slice_us",
374 .data = &sysctl_sched_cfs_bandwidth_slice,
375 .maxlen = sizeof(unsigned int),
377 .proc_handler = proc_dointvec_minmax,
381 #ifdef CONFIG_PROVE_LOCKING
383 .procname = "prove_locking",
384 .data = &prove_locking,
385 .maxlen = sizeof(int),
387 .proc_handler = proc_dointvec,
390 #ifdef CONFIG_LOCK_STAT
392 .procname = "lock_stat",
394 .maxlen = sizeof(int),
396 .proc_handler = proc_dointvec,
401 .data = &panic_timeout,
402 .maxlen = sizeof(int),
404 .proc_handler = proc_dointvec,
407 .procname = "core_uses_pid",
408 .data = &core_uses_pid,
409 .maxlen = sizeof(int),
411 .proc_handler = proc_dointvec,
414 .procname = "core_pattern",
415 .data = core_pattern,
416 .maxlen = CORENAME_MAX_SIZE,
418 .proc_handler = proc_dostring_coredump,
421 .procname = "core_pipe_limit",
422 .data = &core_pipe_limit,
423 .maxlen = sizeof(unsigned int),
425 .proc_handler = proc_dointvec,
427 #ifdef CONFIG_PROC_SYSCTL
429 .procname = "tainted",
430 .maxlen = sizeof(long),
432 .proc_handler = proc_taint,
435 #ifdef CONFIG_LATENCYTOP
437 .procname = "latencytop",
438 .data = &latencytop_enabled,
439 .maxlen = sizeof(int),
441 .proc_handler = proc_dointvec,
444 #ifdef CONFIG_BLK_DEV_INITRD
446 .procname = "real-root-dev",
447 .data = &real_root_dev,
448 .maxlen = sizeof(int),
450 .proc_handler = proc_dointvec,
454 .procname = "print-fatal-signals",
455 .data = &print_fatal_signals,
456 .maxlen = sizeof(int),
458 .proc_handler = proc_dointvec,
462 .procname = "reboot-cmd",
463 .data = reboot_command,
466 .proc_handler = proc_dostring,
469 .procname = "stop-a",
470 .data = &stop_a_enabled,
471 .maxlen = sizeof (int),
473 .proc_handler = proc_dointvec,
476 .procname = "scons-poweroff",
477 .data = &scons_pwroff,
478 .maxlen = sizeof (int),
480 .proc_handler = proc_dointvec,
483 #ifdef CONFIG_SPARC64
485 .procname = "tsb-ratio",
486 .data = &sysctl_tsb_ratio,
487 .maxlen = sizeof (int),
489 .proc_handler = proc_dointvec,
494 .procname = "soft-power",
495 .data = &pwrsw_enabled,
496 .maxlen = sizeof (int),
498 .proc_handler = proc_dointvec,
501 .procname = "unaligned-trap",
502 .data = &unaligned_enabled,
503 .maxlen = sizeof (int),
505 .proc_handler = proc_dointvec,
509 .procname = "ctrl-alt-del",
511 .maxlen = sizeof(int),
513 .proc_handler = proc_dointvec,
515 #ifdef CONFIG_FUNCTION_TRACER
517 .procname = "ftrace_enabled",
518 .data = &ftrace_enabled,
519 .maxlen = sizeof(int),
521 .proc_handler = ftrace_enable_sysctl,
524 #ifdef CONFIG_STACK_TRACER
526 .procname = "stack_tracer_enabled",
527 .data = &stack_tracer_enabled,
528 .maxlen = sizeof(int),
530 .proc_handler = stack_trace_sysctl,
533 #ifdef CONFIG_TRACING
535 .procname = "ftrace_dump_on_oops",
536 .data = &ftrace_dump_on_oops,
537 .maxlen = sizeof(int),
539 .proc_handler = proc_dointvec,
542 #ifdef CONFIG_MODULES
544 .procname = "modprobe",
545 .data = &modprobe_path,
546 .maxlen = KMOD_PATH_LEN,
548 .proc_handler = proc_dostring,
551 .procname = "modules_disabled",
552 .data = &modules_disabled,
553 .maxlen = sizeof(int),
555 /* only handle a transition from default "0" to "1" */
556 .proc_handler = proc_dointvec_minmax,
561 #ifdef CONFIG_HOTPLUG
563 .procname = "hotplug",
564 .data = &uevent_helper,
565 .maxlen = UEVENT_HELPER_PATH_LEN,
567 .proc_handler = proc_dostring,
570 #ifdef CONFIG_CHR_DEV_SG
572 .procname = "sg-big-buff",
573 .data = &sg_big_buff,
574 .maxlen = sizeof (int),
576 .proc_handler = proc_dointvec,
579 #ifdef CONFIG_BSD_PROCESS_ACCT
583 .maxlen = 3*sizeof(int),
585 .proc_handler = proc_dointvec,
588 #ifdef CONFIG_MAGIC_SYSRQ
591 .data = &__sysrq_enabled,
592 .maxlen = sizeof (int),
594 .proc_handler = sysrq_sysctl_handler,
597 #ifdef CONFIG_PROC_SYSCTL
599 .procname = "cad_pid",
601 .maxlen = sizeof (int),
603 .proc_handler = proc_do_cad_pid,
607 .procname = "threads-max",
608 .data = &max_threads,
609 .maxlen = sizeof(int),
611 .proc_handler = proc_dointvec,
614 .procname = "random",
616 .child = random_table,
619 .procname = "usermodehelper",
621 .child = usermodehelper_table,
624 .procname = "overflowuid",
625 .data = &overflowuid,
626 .maxlen = sizeof(int),
628 .proc_handler = proc_dointvec_minmax,
629 .extra1 = &minolduid,
630 .extra2 = &maxolduid,
633 .procname = "overflowgid",
634 .data = &overflowgid,
635 .maxlen = sizeof(int),
637 .proc_handler = proc_dointvec_minmax,
638 .extra1 = &minolduid,
639 .extra2 = &maxolduid,
642 #ifdef CONFIG_MATHEMU
644 .procname = "ieee_emulation_warnings",
645 .data = &sysctl_ieee_emulation_warnings,
646 .maxlen = sizeof(int),
648 .proc_handler = proc_dointvec,
652 .procname = "userprocess_debug",
653 .data = &show_unhandled_signals,
654 .maxlen = sizeof(int),
656 .proc_handler = proc_dointvec,
660 .procname = "pid_max",
662 .maxlen = sizeof (int),
664 .proc_handler = proc_dointvec_minmax,
665 .extra1 = &pid_max_min,
666 .extra2 = &pid_max_max,
669 .procname = "panic_on_oops",
670 .data = &panic_on_oops,
671 .maxlen = sizeof(int),
673 .proc_handler = proc_dointvec,
675 #if defined CONFIG_PRINTK
677 .procname = "printk",
678 .data = &console_loglevel,
679 .maxlen = 4*sizeof(int),
681 .proc_handler = proc_dointvec,
684 .procname = "printk_ratelimit",
685 .data = &printk_ratelimit_state.interval,
686 .maxlen = sizeof(int),
688 .proc_handler = proc_dointvec_jiffies,
691 .procname = "printk_ratelimit_burst",
692 .data = &printk_ratelimit_state.burst,
693 .maxlen = sizeof(int),
695 .proc_handler = proc_dointvec,
698 .procname = "printk_delay",
699 .data = &printk_delay_msec,
700 .maxlen = sizeof(int),
702 .proc_handler = proc_dointvec_minmax,
704 .extra2 = &ten_thousand,
707 .procname = "dmesg_restrict",
708 .data = &dmesg_restrict,
709 .maxlen = sizeof(int),
711 .proc_handler = proc_dointvec_minmax_sysadmin,
716 .procname = "kptr_restrict",
717 .data = &kptr_restrict,
718 .maxlen = sizeof(int),
720 .proc_handler = proc_dointvec_minmax_sysadmin,
726 .procname = "ngroups_max",
727 .data = &ngroups_max,
728 .maxlen = sizeof (int),
730 .proc_handler = proc_dointvec,
733 .procname = "cap_last_cap",
734 .data = (void *)&cap_last_cap,
735 .maxlen = sizeof(int),
737 .proc_handler = proc_dointvec,
739 #if defined(CONFIG_LOCKUP_DETECTOR)
741 .procname = "watchdog",
742 .data = &watchdog_enabled,
743 .maxlen = sizeof (int),
745 .proc_handler = proc_dowatchdog,
750 .procname = "watchdog_thresh",
751 .data = &watchdog_thresh,
752 .maxlen = sizeof(int),
754 .proc_handler = proc_dowatchdog,
759 .procname = "softlockup_panic",
760 .data = &softlockup_panic,
761 .maxlen = sizeof(int),
763 .proc_handler = proc_dointvec_minmax,
768 .procname = "nmi_watchdog",
769 .data = &watchdog_enabled,
770 .maxlen = sizeof (int),
772 .proc_handler = proc_dowatchdog,
777 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
779 .procname = "unknown_nmi_panic",
780 .data = &unknown_nmi_panic,
781 .maxlen = sizeof (int),
783 .proc_handler = proc_dointvec,
786 #if defined(CONFIG_X86)
788 .procname = "panic_on_unrecovered_nmi",
789 .data = &panic_on_unrecovered_nmi,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec,
795 .procname = "panic_on_io_nmi",
796 .data = &panic_on_io_nmi,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec,
801 #ifdef CONFIG_DEBUG_STACKOVERFLOW
803 .procname = "panic_on_stackoverflow",
804 .data = &sysctl_panic_on_stackoverflow,
805 .maxlen = sizeof(int),
807 .proc_handler = proc_dointvec,
811 .procname = "bootloader_type",
812 .data = &bootloader_type,
813 .maxlen = sizeof (int),
815 .proc_handler = proc_dointvec,
818 .procname = "bootloader_version",
819 .data = &bootloader_version,
820 .maxlen = sizeof (int),
822 .proc_handler = proc_dointvec,
825 .procname = "kstack_depth_to_print",
826 .data = &kstack_depth_to_print,
827 .maxlen = sizeof(int),
829 .proc_handler = proc_dointvec,
832 .procname = "io_delay_type",
833 .data = &io_delay_type,
834 .maxlen = sizeof(int),
836 .proc_handler = proc_dointvec,
839 #if defined(CONFIG_MMU)
841 .procname = "randomize_va_space",
842 .data = &randomize_va_space,
843 .maxlen = sizeof(int),
845 .proc_handler = proc_dointvec,
848 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
850 .procname = "spin_retry",
852 .maxlen = sizeof (int),
854 .proc_handler = proc_dointvec,
857 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
859 .procname = "acpi_video_flags",
860 .data = &acpi_realmode_flags,
861 .maxlen = sizeof (unsigned long),
863 .proc_handler = proc_doulongvec_minmax,
868 .procname = "ignore-unaligned-usertrap",
869 .data = &no_unaligned_warning,
870 .maxlen = sizeof (int),
872 .proc_handler = proc_dointvec,
875 .procname = "unaligned-dump-stack",
876 .data = &unaligned_dump_stack,
877 .maxlen = sizeof (int),
879 .proc_handler = proc_dointvec,
882 #ifdef CONFIG_DETECT_HUNG_TASK
884 .procname = "hung_task_panic",
885 .data = &sysctl_hung_task_panic,
886 .maxlen = sizeof(int),
888 .proc_handler = proc_dointvec_minmax,
893 .procname = "hung_task_check_count",
894 .data = &sysctl_hung_task_check_count,
895 .maxlen = sizeof(unsigned long),
897 .proc_handler = proc_doulongvec_minmax,
900 .procname = "hung_task_timeout_secs",
901 .data = &sysctl_hung_task_timeout_secs,
902 .maxlen = sizeof(unsigned long),
904 .proc_handler = proc_dohung_task_timeout_secs,
907 .procname = "hung_task_warnings",
908 .data = &sysctl_hung_task_warnings,
909 .maxlen = sizeof(unsigned long),
911 .proc_handler = proc_doulongvec_minmax,
916 .procname = "compat-log",
918 .maxlen = sizeof (int),
920 .proc_handler = proc_dointvec,
923 #ifdef CONFIG_RT_MUTEXES
925 .procname = "max_lock_depth",
926 .data = &max_lock_depth,
927 .maxlen = sizeof(int),
929 .proc_handler = proc_dointvec,
933 .procname = "poweroff_cmd",
934 .data = &poweroff_cmd,
935 .maxlen = POWEROFF_CMD_PATH_LEN,
937 .proc_handler = proc_dostring,
943 .child = key_sysctls,
946 #ifdef CONFIG_RCU_TORTURE_TEST
948 .procname = "rcutorture_runnable",
949 .data = &rcutorture_runnable,
950 .maxlen = sizeof(int),
952 .proc_handler = proc_dointvec,
955 #ifdef CONFIG_PERF_EVENTS
957 * User-space scripts rely on the existence of this file
958 * as a feature check for perf_events being enabled.
960 * So it's an ABI, do not remove!
963 .procname = "perf_event_paranoid",
964 .data = &sysctl_perf_event_paranoid,
965 .maxlen = sizeof(sysctl_perf_event_paranoid),
967 .proc_handler = proc_dointvec,
970 .procname = "perf_event_mlock_kb",
971 .data = &sysctl_perf_event_mlock,
972 .maxlen = sizeof(sysctl_perf_event_mlock),
974 .proc_handler = proc_dointvec,
977 .procname = "perf_event_max_sample_rate",
978 .data = &sysctl_perf_event_sample_rate,
979 .maxlen = sizeof(sysctl_perf_event_sample_rate),
981 .proc_handler = perf_proc_update_handler,
984 #ifdef CONFIG_KMEMCHECK
986 .procname = "kmemcheck",
987 .data = &kmemcheck_enabled,
988 .maxlen = sizeof(int),
990 .proc_handler = proc_dointvec,
995 .procname = "blk_iopoll",
996 .data = &blk_iopoll_enabled,
997 .maxlen = sizeof(int),
999 .proc_handler = proc_dointvec,
1005 static struct ctl_table vm_table[] = {
1007 .procname = "overcommit_memory",
1008 .data = &sysctl_overcommit_memory,
1009 .maxlen = sizeof(sysctl_overcommit_memory),
1011 .proc_handler = proc_dointvec_minmax,
1016 .procname = "panic_on_oom",
1017 .data = &sysctl_panic_on_oom,
1018 .maxlen = sizeof(sysctl_panic_on_oom),
1020 .proc_handler = proc_dointvec_minmax,
1025 .procname = "oom_kill_allocating_task",
1026 .data = &sysctl_oom_kill_allocating_task,
1027 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1029 .proc_handler = proc_dointvec,
1032 .procname = "oom_dump_tasks",
1033 .data = &sysctl_oom_dump_tasks,
1034 .maxlen = sizeof(sysctl_oom_dump_tasks),
1036 .proc_handler = proc_dointvec,
1039 .procname = "overcommit_ratio",
1040 .data = &sysctl_overcommit_ratio,
1041 .maxlen = sizeof(sysctl_overcommit_ratio),
1043 .proc_handler = proc_dointvec,
1046 .procname = "page-cluster",
1047 .data = &page_cluster,
1048 .maxlen = sizeof(int),
1050 .proc_handler = proc_dointvec_minmax,
1054 .procname = "dirty_background_ratio",
1055 .data = &dirty_background_ratio,
1056 .maxlen = sizeof(dirty_background_ratio),
1058 .proc_handler = dirty_background_ratio_handler,
1060 .extra2 = &one_hundred,
1063 .procname = "dirty_background_bytes",
1064 .data = &dirty_background_bytes,
1065 .maxlen = sizeof(dirty_background_bytes),
1067 .proc_handler = dirty_background_bytes_handler,
1071 .procname = "dirty_ratio",
1072 .data = &vm_dirty_ratio,
1073 .maxlen = sizeof(vm_dirty_ratio),
1075 .proc_handler = dirty_ratio_handler,
1077 .extra2 = &one_hundred,
1080 .procname = "dirty_bytes",
1081 .data = &vm_dirty_bytes,
1082 .maxlen = sizeof(vm_dirty_bytes),
1084 .proc_handler = dirty_bytes_handler,
1085 .extra1 = &dirty_bytes_min,
1088 .procname = "dirty_writeback_centisecs",
1089 .data = &dirty_writeback_interval,
1090 .maxlen = sizeof(dirty_writeback_interval),
1092 .proc_handler = dirty_writeback_centisecs_handler,
1095 .procname = "dirty_expire_centisecs",
1096 .data = &dirty_expire_interval,
1097 .maxlen = sizeof(dirty_expire_interval),
1099 .proc_handler = proc_dointvec_minmax,
1103 .procname = "nr_pdflush_threads",
1104 .data = &nr_pdflush_threads,
1105 .maxlen = sizeof nr_pdflush_threads,
1106 .mode = 0444 /* read-only*/,
1107 .proc_handler = proc_dointvec,
1110 .procname = "swappiness",
1111 .data = &vm_swappiness,
1112 .maxlen = sizeof(vm_swappiness),
1114 .proc_handler = proc_dointvec_minmax,
1116 .extra2 = &one_hundred,
1118 #ifdef CONFIG_HUGETLB_PAGE
1120 .procname = "nr_hugepages",
1122 .maxlen = sizeof(unsigned long),
1124 .proc_handler = hugetlb_sysctl_handler,
1125 .extra1 = (void *)&hugetlb_zero,
1126 .extra2 = (void *)&hugetlb_infinity,
1130 .procname = "nr_hugepages_mempolicy",
1132 .maxlen = sizeof(unsigned long),
1134 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1135 .extra1 = (void *)&hugetlb_zero,
1136 .extra2 = (void *)&hugetlb_infinity,
1140 .procname = "hugetlb_shm_group",
1141 .data = &sysctl_hugetlb_shm_group,
1142 .maxlen = sizeof(gid_t),
1144 .proc_handler = proc_dointvec,
1147 .procname = "hugepages_treat_as_movable",
1148 .data = &hugepages_treat_as_movable,
1149 .maxlen = sizeof(int),
1151 .proc_handler = hugetlb_treat_movable_handler,
1154 .procname = "nr_overcommit_hugepages",
1156 .maxlen = sizeof(unsigned long),
1158 .proc_handler = hugetlb_overcommit_handler,
1159 .extra1 = (void *)&hugetlb_zero,
1160 .extra2 = (void *)&hugetlb_infinity,
1164 .procname = "lowmem_reserve_ratio",
1165 .data = &sysctl_lowmem_reserve_ratio,
1166 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1168 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1171 .procname = "drop_caches",
1172 .data = &sysctl_drop_caches,
1173 .maxlen = sizeof(int),
1175 .proc_handler = drop_caches_sysctl_handler,
1179 #ifdef CONFIG_COMPACTION
1181 .procname = "compact_memory",
1182 .data = &sysctl_compact_memory,
1183 .maxlen = sizeof(int),
1185 .proc_handler = sysctl_compaction_handler,
1188 .procname = "extfrag_threshold",
1189 .data = &sysctl_extfrag_threshold,
1190 .maxlen = sizeof(int),
1192 .proc_handler = sysctl_extfrag_handler,
1193 .extra1 = &min_extfrag_threshold,
1194 .extra2 = &max_extfrag_threshold,
1197 #endif /* CONFIG_COMPACTION */
1199 .procname = "min_free_kbytes",
1200 .data = &min_free_kbytes,
1201 .maxlen = sizeof(min_free_kbytes),
1203 .proc_handler = min_free_kbytes_sysctl_handler,
1207 .procname = "percpu_pagelist_fraction",
1208 .data = &percpu_pagelist_fraction,
1209 .maxlen = sizeof(percpu_pagelist_fraction),
1211 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1212 .extra1 = &min_percpu_pagelist_fract,
1216 .procname = "max_map_count",
1217 .data = &sysctl_max_map_count,
1218 .maxlen = sizeof(sysctl_max_map_count),
1220 .proc_handler = proc_dointvec_minmax,
1225 .procname = "nr_trim_pages",
1226 .data = &sysctl_nr_trim_pages,
1227 .maxlen = sizeof(sysctl_nr_trim_pages),
1229 .proc_handler = proc_dointvec_minmax,
1234 .procname = "laptop_mode",
1235 .data = &laptop_mode,
1236 .maxlen = sizeof(laptop_mode),
1238 .proc_handler = proc_dointvec_jiffies,
1241 .procname = "block_dump",
1242 .data = &block_dump,
1243 .maxlen = sizeof(block_dump),
1245 .proc_handler = proc_dointvec,
1249 .procname = "vfs_cache_pressure",
1250 .data = &sysctl_vfs_cache_pressure,
1251 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1253 .proc_handler = proc_dointvec,
1256 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1258 .procname = "legacy_va_layout",
1259 .data = &sysctl_legacy_va_layout,
1260 .maxlen = sizeof(sysctl_legacy_va_layout),
1262 .proc_handler = proc_dointvec,
1268 .procname = "zone_reclaim_mode",
1269 .data = &zone_reclaim_mode,
1270 .maxlen = sizeof(zone_reclaim_mode),
1272 .proc_handler = proc_dointvec,
1276 .procname = "min_unmapped_ratio",
1277 .data = &sysctl_min_unmapped_ratio,
1278 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1280 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1282 .extra2 = &one_hundred,
1285 .procname = "min_slab_ratio",
1286 .data = &sysctl_min_slab_ratio,
1287 .maxlen = sizeof(sysctl_min_slab_ratio),
1289 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1291 .extra2 = &one_hundred,
1296 .procname = "stat_interval",
1297 .data = &sysctl_stat_interval,
1298 .maxlen = sizeof(sysctl_stat_interval),
1300 .proc_handler = proc_dointvec_jiffies,
1305 .procname = "mmap_min_addr",
1306 .data = &dac_mmap_min_addr,
1307 .maxlen = sizeof(unsigned long),
1309 .proc_handler = mmap_min_addr_handler,
1314 .procname = "numa_zonelist_order",
1315 .data = &numa_zonelist_order,
1316 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1318 .proc_handler = numa_zonelist_order_handler,
1321 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1322 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1324 .procname = "vdso_enabled",
1325 .data = &vdso_enabled,
1326 .maxlen = sizeof(vdso_enabled),
1328 .proc_handler = proc_dointvec,
1332 #ifdef CONFIG_HIGHMEM
1334 .procname = "highmem_is_dirtyable",
1335 .data = &vm_highmem_is_dirtyable,
1336 .maxlen = sizeof(vm_highmem_is_dirtyable),
1338 .proc_handler = proc_dointvec_minmax,
1344 .procname = "scan_unevictable_pages",
1345 .data = &scan_unevictable_pages,
1346 .maxlen = sizeof(scan_unevictable_pages),
1348 .proc_handler = scan_unevictable_handler,
1350 #ifdef CONFIG_MEMORY_FAILURE
1352 .procname = "memory_failure_early_kill",
1353 .data = &sysctl_memory_failure_early_kill,
1354 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1356 .proc_handler = proc_dointvec_minmax,
1361 .procname = "memory_failure_recovery",
1362 .data = &sysctl_memory_failure_recovery,
1363 .maxlen = sizeof(sysctl_memory_failure_recovery),
1365 .proc_handler = proc_dointvec_minmax,
1373 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1374 static struct ctl_table binfmt_misc_table[] = {
1379 static struct ctl_table fs_table[] = {
1381 .procname = "inode-nr",
1382 .data = &inodes_stat,
1383 .maxlen = 2*sizeof(int),
1385 .proc_handler = proc_nr_inodes,
1388 .procname = "inode-state",
1389 .data = &inodes_stat,
1390 .maxlen = 7*sizeof(int),
1392 .proc_handler = proc_nr_inodes,
1395 .procname = "file-nr",
1396 .data = &files_stat,
1397 .maxlen = sizeof(files_stat),
1399 .proc_handler = proc_nr_files,
1402 .procname = "file-max",
1403 .data = &files_stat.max_files,
1404 .maxlen = sizeof(files_stat.max_files),
1406 .proc_handler = proc_doulongvec_minmax,
1409 .procname = "nr_open",
1410 .data = &sysctl_nr_open,
1411 .maxlen = sizeof(int),
1413 .proc_handler = proc_dointvec_minmax,
1414 .extra1 = &sysctl_nr_open_min,
1415 .extra2 = &sysctl_nr_open_max,
1418 .procname = "dentry-state",
1419 .data = &dentry_stat,
1420 .maxlen = 6*sizeof(int),
1422 .proc_handler = proc_nr_dentry,
1425 .procname = "overflowuid",
1426 .data = &fs_overflowuid,
1427 .maxlen = sizeof(int),
1429 .proc_handler = proc_dointvec_minmax,
1430 .extra1 = &minolduid,
1431 .extra2 = &maxolduid,
1434 .procname = "overflowgid",
1435 .data = &fs_overflowgid,
1436 .maxlen = sizeof(int),
1438 .proc_handler = proc_dointvec_minmax,
1439 .extra1 = &minolduid,
1440 .extra2 = &maxolduid,
1442 #ifdef CONFIG_FILE_LOCKING
1444 .procname = "leases-enable",
1445 .data = &leases_enable,
1446 .maxlen = sizeof(int),
1448 .proc_handler = proc_dointvec,
1451 #ifdef CONFIG_DNOTIFY
1453 .procname = "dir-notify-enable",
1454 .data = &dir_notify_enable,
1455 .maxlen = sizeof(int),
1457 .proc_handler = proc_dointvec,
1461 #ifdef CONFIG_FILE_LOCKING
1463 .procname = "lease-break-time",
1464 .data = &lease_break_time,
1465 .maxlen = sizeof(int),
1467 .proc_handler = proc_dointvec,
1472 .procname = "aio-nr",
1474 .maxlen = sizeof(aio_nr),
1476 .proc_handler = proc_doulongvec_minmax,
1479 .procname = "aio-max-nr",
1480 .data = &aio_max_nr,
1481 .maxlen = sizeof(aio_max_nr),
1483 .proc_handler = proc_doulongvec_minmax,
1485 #endif /* CONFIG_AIO */
1486 #ifdef CONFIG_INOTIFY_USER
1488 .procname = "inotify",
1490 .child = inotify_table,
1495 .procname = "epoll",
1497 .child = epoll_table,
1502 .procname = "suid_dumpable",
1503 .data = &suid_dumpable,
1504 .maxlen = sizeof(int),
1506 .proc_handler = proc_dointvec_minmax_coredump,
1510 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1512 .procname = "binfmt_misc",
1514 .child = binfmt_misc_table,
1518 .procname = "pipe-max-size",
1519 .data = &pipe_max_size,
1520 .maxlen = sizeof(int),
1522 .proc_handler = &pipe_proc_fn,
1523 .extra1 = &pipe_min_size,
1528 static struct ctl_table debug_table[] = {
1529 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1530 defined(CONFIG_S390) || defined(CONFIG_TILE)
1532 .procname = "exception-trace",
1533 .data = &show_unhandled_signals,
1534 .maxlen = sizeof(int),
1536 .proc_handler = proc_dointvec
1539 #if defined(CONFIG_OPTPROBES)
1541 .procname = "kprobes-optimization",
1542 .data = &sysctl_kprobes_optimization,
1543 .maxlen = sizeof(int),
1545 .proc_handler = proc_kprobes_optimization_handler,
1553 static struct ctl_table dev_table[] = {
1557 int __init sysctl_init(void)
1559 register_sysctl_table(sysctl_base_table);
1563 #endif /* CONFIG_SYSCTL */
1569 #ifdef CONFIG_PROC_SYSCTL
1571 static int _proc_do_string(void* data, int maxlen, int write,
1572 void __user *buffer,
1573 size_t *lenp, loff_t *ppos)
1579 if (!data || !maxlen || !*lenp) {
1587 while (len < *lenp) {
1588 if (get_user(c, p++))
1590 if (c == 0 || c == '\n')
1596 if(copy_from_user(data, buffer, len))
1598 ((char *) data)[len] = 0;
1616 if(copy_to_user(buffer, data, len))
1619 if(put_user('\n', ((char __user *) buffer) + len))
1630 * proc_dostring - read a string sysctl
1631 * @table: the sysctl table
1632 * @write: %TRUE if this is a write to the sysctl file
1633 * @buffer: the user buffer
1634 * @lenp: the size of the user buffer
1635 * @ppos: file position
1637 * Reads/writes a string from/to the user buffer. If the kernel
1638 * buffer provided is not large enough to hold the string, the
1639 * string is truncated. The copied string is %NULL-terminated.
1640 * If the string is being read by the user process, it is copied
1641 * and a newline '\n' is added. It is truncated if the buffer is
1644 * Returns 0 on success.
1646 int proc_dostring(struct ctl_table *table, int write,
1647 void __user *buffer, size_t *lenp, loff_t *ppos)
1649 return _proc_do_string(table->data, table->maxlen, write,
1650 buffer, lenp, ppos);
1653 static size_t proc_skip_spaces(char **buf)
1656 char *tmp = skip_spaces(*buf);
1662 static void proc_skip_char(char **buf, size_t *size, const char v)
1672 #define TMPBUFLEN 22
1674 * proc_get_long - reads an ASCII formatted integer from a user buffer
1676 * @buf: a kernel buffer
1677 * @size: size of the kernel buffer
1678 * @val: this is where the number will be stored
1679 * @neg: set to %TRUE if number is negative
1680 * @perm_tr: a vector which contains the allowed trailers
1681 * @perm_tr_len: size of the perm_tr vector
1682 * @tr: pointer to store the trailer character
1684 * In case of success %0 is returned and @buf and @size are updated with
1685 * the amount of bytes read. If @tr is non-NULL and a trailing
1686 * character exists (size is non-zero after returning from this
1687 * function), @tr is updated with the trailing character.
1689 static int proc_get_long(char **buf, size_t *size,
1690 unsigned long *val, bool *neg,
1691 const char *perm_tr, unsigned perm_tr_len, char *tr)
1694 char *p, tmp[TMPBUFLEN];
1700 if (len > TMPBUFLEN - 1)
1701 len = TMPBUFLEN - 1;
1703 memcpy(tmp, *buf, len);
1707 if (*p == '-' && *size > 1) {
1715 *val = simple_strtoul(p, &p, 0);
1719 /* We don't know if the next char is whitespace thus we may accept
1720 * invalid integers (e.g. 1234...a) or two integers instead of one
1721 * (e.g. 123...1). So lets not allow such large numbers. */
1722 if (len == TMPBUFLEN - 1)
1725 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1728 if (tr && (len < *size))
1738 * proc_put_long - converts an integer to a decimal ASCII formatted string
1740 * @buf: the user buffer
1741 * @size: the size of the user buffer
1742 * @val: the integer to be converted
1743 * @neg: sign of the number, %TRUE for negative
1745 * In case of success %0 is returned and @buf and @size are updated with
1746 * the amount of bytes written.
1748 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1752 char tmp[TMPBUFLEN], *p = tmp;
1754 sprintf(p, "%s%lu", neg ? "-" : "", val);
1758 if (copy_to_user(*buf, tmp, len))
1766 static int proc_put_char(void __user **buf, size_t *size, char c)
1769 char __user **buffer = (char __user **)buf;
1770 if (put_user(c, *buffer))
1772 (*size)--, (*buffer)++;
1778 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1780 int write, void *data)
1783 *valp = *negp ? -*lvalp : *lvalp;
1788 *lvalp = (unsigned long)-val;
1791 *lvalp = (unsigned long)val;
1797 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1799 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1800 int write, void __user *buffer,
1801 size_t *lenp, loff_t *ppos,
1802 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1803 int write, void *data),
1806 int *i, vleft, first = 1, err = 0;
1807 unsigned long page = 0;
1811 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1816 i = (int *) tbl_data;
1817 vleft = table->maxlen / sizeof(*i);
1821 conv = do_proc_dointvec_conv;
1824 if (left > PAGE_SIZE - 1)
1825 left = PAGE_SIZE - 1;
1826 page = __get_free_page(GFP_TEMPORARY);
1827 kbuf = (char *) page;
1830 if (copy_from_user(kbuf, buffer, left)) {
1837 for (; left && vleft--; i++, first=0) {
1842 left -= proc_skip_spaces(&kbuf);
1846 err = proc_get_long(&kbuf, &left, &lval, &neg,
1848 sizeof(proc_wspace_sep), NULL);
1851 if (conv(&neg, &lval, i, 1, data)) {
1856 if (conv(&neg, &lval, i, 0, data)) {
1861 err = proc_put_char(&buffer, &left, '\t');
1864 err = proc_put_long(&buffer, &left, lval, neg);
1870 if (!write && !first && left && !err)
1871 err = proc_put_char(&buffer, &left, '\n');
1872 if (write && !err && left)
1873 left -= proc_skip_spaces(&kbuf);
1878 return err ? : -EINVAL;
1885 static int do_proc_dointvec(struct ctl_table *table, int write,
1886 void __user *buffer, size_t *lenp, loff_t *ppos,
1887 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1888 int write, void *data),
1891 return __do_proc_dointvec(table->data, table, write,
1892 buffer, lenp, ppos, conv, data);
1896 * proc_dointvec - read a vector of integers
1897 * @table: the sysctl table
1898 * @write: %TRUE if this is a write to the sysctl file
1899 * @buffer: the user buffer
1900 * @lenp: the size of the user buffer
1901 * @ppos: file position
1903 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1904 * values from/to the user buffer, treated as an ASCII string.
1906 * Returns 0 on success.
1908 int proc_dointvec(struct ctl_table *table, int write,
1909 void __user *buffer, size_t *lenp, loff_t *ppos)
1911 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1916 * Taint values can only be increased
1917 * This means we can safely use a temporary.
1919 static int proc_taint(struct ctl_table *table, int write,
1920 void __user *buffer, size_t *lenp, loff_t *ppos)
1923 unsigned long tmptaint = get_taint();
1926 if (write && !capable(CAP_SYS_ADMIN))
1931 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1937 * Poor man's atomic or. Not worth adding a primitive
1938 * to everyone's atomic.h for this
1941 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1942 if ((tmptaint >> i) & 1)
1950 #ifdef CONFIG_PRINTK
1951 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1952 void __user *buffer, size_t *lenp, loff_t *ppos)
1954 if (write && !capable(CAP_SYS_ADMIN))
1957 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1961 struct do_proc_dointvec_minmax_conv_param {
1966 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1968 int write, void *data)
1970 struct do_proc_dointvec_minmax_conv_param *param = data;
1972 int val = *negp ? -*lvalp : *lvalp;
1973 if ((param->min && *param->min > val) ||
1974 (param->max && *param->max < val))
1981 *lvalp = (unsigned long)-val;
1984 *lvalp = (unsigned long)val;
1991 * proc_dointvec_minmax - read a vector of integers with min/max values
1992 * @table: the sysctl table
1993 * @write: %TRUE if this is a write to the sysctl file
1994 * @buffer: the user buffer
1995 * @lenp: the size of the user buffer
1996 * @ppos: file position
1998 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1999 * values from/to the user buffer, treated as an ASCII string.
2001 * This routine will ensure the values are within the range specified by
2002 * table->extra1 (min) and table->extra2 (max).
2004 * Returns 0 on success.
2006 int proc_dointvec_minmax(struct ctl_table *table, int write,
2007 void __user *buffer, size_t *lenp, loff_t *ppos)
2009 struct do_proc_dointvec_minmax_conv_param param = {
2010 .min = (int *) table->extra1,
2011 .max = (int *) table->extra2,
2013 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2014 do_proc_dointvec_minmax_conv, ¶m);
2017 static void validate_coredump_safety(void)
2019 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2020 core_pattern[0] != '/' && core_pattern[0] != '|') {
2021 printk(KERN_WARNING "Unsafe core_pattern used with "\
2022 "suid_dumpable=2. Pipe handler or fully qualified "\
2023 "core dump path required.\n");
2027 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2028 void __user *buffer, size_t *lenp, loff_t *ppos)
2030 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2032 validate_coredump_safety();
2036 static int proc_dostring_coredump(struct ctl_table *table, int write,
2037 void __user *buffer, size_t *lenp, loff_t *ppos)
2039 int error = proc_dostring(table, write, buffer, lenp, ppos);
2041 validate_coredump_safety();
2045 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2046 void __user *buffer,
2047 size_t *lenp, loff_t *ppos,
2048 unsigned long convmul,
2049 unsigned long convdiv)
2051 unsigned long *i, *min, *max;
2052 int vleft, first = 1, err = 0;
2053 unsigned long page = 0;
2057 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2062 i = (unsigned long *) data;
2063 min = (unsigned long *) table->extra1;
2064 max = (unsigned long *) table->extra2;
2065 vleft = table->maxlen / sizeof(unsigned long);
2069 if (left > PAGE_SIZE - 1)
2070 left = PAGE_SIZE - 1;
2071 page = __get_free_page(GFP_TEMPORARY);
2072 kbuf = (char *) page;
2075 if (copy_from_user(kbuf, buffer, left)) {
2082 for (; left && vleft--; i++, first = 0) {
2088 left -= proc_skip_spaces(&kbuf);
2090 err = proc_get_long(&kbuf, &left, &val, &neg,
2092 sizeof(proc_wspace_sep), NULL);
2097 if ((min && val < *min) || (max && val > *max))
2101 val = convdiv * (*i) / convmul;
2103 err = proc_put_char(&buffer, &left, '\t');
2104 err = proc_put_long(&buffer, &left, val, false);
2110 if (!write && !first && left && !err)
2111 err = proc_put_char(&buffer, &left, '\n');
2113 left -= proc_skip_spaces(&kbuf);
2118 return err ? : -EINVAL;
2125 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2126 void __user *buffer,
2127 size_t *lenp, loff_t *ppos,
2128 unsigned long convmul,
2129 unsigned long convdiv)
2131 return __do_proc_doulongvec_minmax(table->data, table, write,
2132 buffer, lenp, ppos, convmul, convdiv);
2136 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2137 * @table: the sysctl table
2138 * @write: %TRUE if this is a write to the sysctl file
2139 * @buffer: the user buffer
2140 * @lenp: the size of the user buffer
2141 * @ppos: file position
2143 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2144 * values from/to the user buffer, treated as an ASCII string.
2146 * This routine will ensure the values are within the range specified by
2147 * table->extra1 (min) and table->extra2 (max).
2149 * Returns 0 on success.
2151 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2152 void __user *buffer, size_t *lenp, loff_t *ppos)
2154 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2158 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2159 * @table: the sysctl table
2160 * @write: %TRUE if this is a write to the sysctl file
2161 * @buffer: the user buffer
2162 * @lenp: the size of the user buffer
2163 * @ppos: file position
2165 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2166 * values from/to the user buffer, treated as an ASCII string. The values
2167 * are treated as milliseconds, and converted to jiffies when they are stored.
2169 * This routine will ensure the values are within the range specified by
2170 * table->extra1 (min) and table->extra2 (max).
2172 * Returns 0 on success.
2174 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2175 void __user *buffer,
2176 size_t *lenp, loff_t *ppos)
2178 return do_proc_doulongvec_minmax(table, write, buffer,
2179 lenp, ppos, HZ, 1000l);
2183 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2185 int write, void *data)
2188 if (*lvalp > LONG_MAX / HZ)
2190 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2196 lval = (unsigned long)-val;
2199 lval = (unsigned long)val;
2206 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2208 int write, void *data)
2211 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2213 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2219 lval = (unsigned long)-val;
2222 lval = (unsigned long)val;
2224 *lvalp = jiffies_to_clock_t(lval);
2229 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2231 int write, void *data)
2234 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2240 lval = (unsigned long)-val;
2243 lval = (unsigned long)val;
2245 *lvalp = jiffies_to_msecs(lval);
2251 * proc_dointvec_jiffies - read a vector of integers as seconds
2252 * @table: the sysctl table
2253 * @write: %TRUE if this is a write to the sysctl file
2254 * @buffer: the user buffer
2255 * @lenp: the size of the user buffer
2256 * @ppos: file position
2258 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2259 * values from/to the user buffer, treated as an ASCII string.
2260 * The values read are assumed to be in seconds, and are converted into
2263 * Returns 0 on success.
2265 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2266 void __user *buffer, size_t *lenp, loff_t *ppos)
2268 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2269 do_proc_dointvec_jiffies_conv,NULL);
2273 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: pointer to the file position
2280 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2281 * values from/to the user buffer, treated as an ASCII string.
2282 * The values read are assumed to be in 1/USER_HZ seconds, and
2283 * are converted into jiffies.
2285 * Returns 0 on success.
2287 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2288 void __user *buffer, size_t *lenp, loff_t *ppos)
2290 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2291 do_proc_dointvec_userhz_jiffies_conv,NULL);
2295 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2296 * @table: the sysctl table
2297 * @write: %TRUE if this is a write to the sysctl file
2298 * @buffer: the user buffer
2299 * @lenp: the size of the user buffer
2300 * @ppos: file position
2301 * @ppos: the current position in the file
2303 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2304 * values from/to the user buffer, treated as an ASCII string.
2305 * The values read are assumed to be in 1/1000 seconds, and
2306 * are converted into jiffies.
2308 * Returns 0 on success.
2310 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2311 void __user *buffer, size_t *lenp, loff_t *ppos)
2313 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2314 do_proc_dointvec_ms_jiffies_conv, NULL);
2317 static int proc_do_cad_pid(struct ctl_table *table, int write,
2318 void __user *buffer, size_t *lenp, loff_t *ppos)
2320 struct pid *new_pid;
2324 tmp = pid_vnr(cad_pid);
2326 r = __do_proc_dointvec(&tmp, table, write, buffer,
2327 lenp, ppos, NULL, NULL);
2331 new_pid = find_get_pid(tmp);
2335 put_pid(xchg(&cad_pid, new_pid));
2340 * proc_do_large_bitmap - read/write from/to a large bitmap
2341 * @table: the sysctl table
2342 * @write: %TRUE if this is a write to the sysctl file
2343 * @buffer: the user buffer
2344 * @lenp: the size of the user buffer
2345 * @ppos: file position
2347 * The bitmap is stored at table->data and the bitmap length (in bits)
2350 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2351 * large bitmaps may be represented in a compact manner. Writing into
2352 * the file will clear the bitmap then update it with the given input.
2354 * Returns 0 on success.
2356 int proc_do_large_bitmap(struct ctl_table *table, int write,
2357 void __user *buffer, size_t *lenp, loff_t *ppos)
2361 size_t left = *lenp;
2362 unsigned long bitmap_len = table->maxlen;
2363 unsigned long *bitmap = (unsigned long *) table->data;
2364 unsigned long *tmp_bitmap = NULL;
2365 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2367 if (!bitmap_len || !left || (*ppos && !write)) {
2373 unsigned long page = 0;
2376 if (left > PAGE_SIZE - 1)
2377 left = PAGE_SIZE - 1;
2379 page = __get_free_page(GFP_TEMPORARY);
2380 kbuf = (char *) page;
2383 if (copy_from_user(kbuf, buffer, left)) {
2389 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2395 proc_skip_char(&kbuf, &left, '\n');
2396 while (!err && left) {
2397 unsigned long val_a, val_b;
2400 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2404 if (val_a >= bitmap_len || neg) {
2416 err = proc_get_long(&kbuf, &left, &val_b,
2417 &neg, tr_b, sizeof(tr_b),
2421 if (val_b >= bitmap_len || neg ||
2432 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2434 proc_skip_char(&kbuf, &left, '\n');
2438 unsigned long bit_a, bit_b = 0;
2441 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2442 if (bit_a >= bitmap_len)
2444 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2448 err = proc_put_char(&buffer, &left, ',');
2452 err = proc_put_long(&buffer, &left, bit_a, false);
2455 if (bit_a != bit_b) {
2456 err = proc_put_char(&buffer, &left, '-');
2459 err = proc_put_long(&buffer, &left, bit_b, false);
2467 err = proc_put_char(&buffer, &left, '\n');
2473 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2475 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2487 #else /* CONFIG_PROC_SYSCTL */
2489 int proc_dostring(struct ctl_table *table, int write,
2490 void __user *buffer, size_t *lenp, loff_t *ppos)
2495 int proc_dointvec(struct ctl_table *table, int write,
2496 void __user *buffer, size_t *lenp, loff_t *ppos)
2501 int proc_dointvec_minmax(struct ctl_table *table, int write,
2502 void __user *buffer, size_t *lenp, loff_t *ppos)
2507 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2508 void __user *buffer, size_t *lenp, loff_t *ppos)
2513 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2514 void __user *buffer, size_t *lenp, loff_t *ppos)
2519 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2520 void __user *buffer, size_t *lenp, loff_t *ppos)
2525 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2531 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2532 void __user *buffer,
2533 size_t *lenp, loff_t *ppos)
2539 #endif /* CONFIG_PROC_SYSCTL */
2542 * No sense putting this after each symbol definition, twice,
2543 * exception granted :-)
2545 EXPORT_SYMBOL(proc_dointvec);
2546 EXPORT_SYMBOL(proc_dointvec_jiffies);
2547 EXPORT_SYMBOL(proc_dointvec_minmax);
2548 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2549 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2550 EXPORT_SYMBOL(proc_dostring);
2551 EXPORT_SYMBOL(proc_doulongvec_minmax);
2552 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);