2 * sysctl.c: General linux system control interface
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/kexec.h>
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
72 #include <asm/stacktrace.h>
76 #include <asm/setup.h>
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
87 #ifdef CONFIG_CHR_DEV_SG
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
96 #if defined(CONFIG_SYSCTL)
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
113 extern int sysctl_nr_trim_pages;
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
121 static int __maybe_unused neg_one = -1;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
130 static int ten_thousand = 10000;
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
140 static int ngroups_max = NGROUPS_MAX;
141 static const int cap_last_cap = CAP_LAST_CAP;
143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
155 extern int pwrsw_enabled;
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled;
163 extern int unaligned_dump_stack;
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning;
170 #ifdef CONFIG_PROC_SYSCTL
172 #define SYSCTL_WRITES_LEGACY -1
173 #define SYSCTL_WRITES_WARN 0
174 #define SYSCTL_WRITES_STRICT 1
176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
178 static int proc_do_cad_pid(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_taint(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #ifdef CONFIG_COREDUMP
192 static int proc_dostring_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
196 #ifdef CONFIG_MAGIC_SYSRQ
197 /* Note: sysrq code uses it's own private copy */
198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
200 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
201 void __user *buffer, size_t *lenp,
206 error = proc_dointvec(table, write, buffer, lenp, ppos);
211 sysrq_toggle_support(__sysrq_enabled);
218 static struct ctl_table kern_table[];
219 static struct ctl_table vm_table[];
220 static struct ctl_table fs_table[];
221 static struct ctl_table debug_table[];
222 static struct ctl_table dev_table[];
223 extern struct ctl_table random_table[];
225 extern struct ctl_table epoll_table[];
228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
229 int sysctl_legacy_va_layout;
232 /* The default sysctl tables: */
234 static struct ctl_table sysctl_base_table[] = {
236 .procname = "kernel",
253 .child = debug_table,
263 #ifdef CONFIG_SCHED_DEBUG
264 static int min_sched_granularity_ns = 100000; /* 100 usecs */
265 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 static int min_wakeup_granularity_ns; /* 0 usecs */
267 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
271 #endif /* CONFIG_SMP */
272 #endif /* CONFIG_SCHED_DEBUG */
274 #ifdef CONFIG_COMPACTION
275 static int min_extfrag_threshold;
276 static int max_extfrag_threshold = 1000;
279 static struct ctl_table kern_table[] = {
281 .procname = "sched_child_runs_first",
282 .data = &sysctl_sched_child_runs_first,
283 .maxlen = sizeof(unsigned int),
285 .proc_handler = proc_dointvec,
287 #ifdef CONFIG_SCHED_DEBUG
289 .procname = "sched_min_granularity_ns",
290 .data = &sysctl_sched_min_granularity,
291 .maxlen = sizeof(unsigned int),
293 .proc_handler = sched_proc_update_handler,
294 .extra1 = &min_sched_granularity_ns,
295 .extra2 = &max_sched_granularity_ns,
298 .procname = "sched_latency_ns",
299 .data = &sysctl_sched_latency,
300 .maxlen = sizeof(unsigned int),
302 .proc_handler = sched_proc_update_handler,
303 .extra1 = &min_sched_granularity_ns,
304 .extra2 = &max_sched_granularity_ns,
307 .procname = "sched_wakeup_granularity_ns",
308 .data = &sysctl_sched_wakeup_granularity,
309 .maxlen = sizeof(unsigned int),
311 .proc_handler = sched_proc_update_handler,
312 .extra1 = &min_wakeup_granularity_ns,
313 .extra2 = &max_wakeup_granularity_ns,
317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
321 .proc_handler = sched_proc_update_handler,
322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
326 .procname = "sched_migration_cost_ns",
327 .data = &sysctl_sched_migration_cost,
328 .maxlen = sizeof(unsigned int),
330 .proc_handler = proc_dointvec,
333 .procname = "sched_nr_migrate",
334 .data = &sysctl_sched_nr_migrate,
335 .maxlen = sizeof(unsigned int),
337 .proc_handler = proc_dointvec,
340 .procname = "sched_time_avg_ms",
341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
344 .proc_handler = proc_dointvec,
347 .procname = "sched_shares_window_ns",
348 .data = &sysctl_sched_shares_window,
349 .maxlen = sizeof(unsigned int),
351 .proc_handler = proc_dointvec,
354 .procname = "timer_migration",
355 .data = &sysctl_timer_migration,
356 .maxlen = sizeof(unsigned int),
358 .proc_handler = proc_dointvec_minmax,
362 #endif /* CONFIG_SMP */
363 #ifdef CONFIG_NUMA_BALANCING
365 .procname = "numa_balancing_scan_delay_ms",
366 .data = &sysctl_numa_balancing_scan_delay,
367 .maxlen = sizeof(unsigned int),
369 .proc_handler = proc_dointvec,
372 .procname = "numa_balancing_scan_period_min_ms",
373 .data = &sysctl_numa_balancing_scan_period_min,
374 .maxlen = sizeof(unsigned int),
376 .proc_handler = proc_dointvec,
379 .procname = "numa_balancing_scan_period_max_ms",
380 .data = &sysctl_numa_balancing_scan_period_max,
381 .maxlen = sizeof(unsigned int),
383 .proc_handler = proc_dointvec,
386 .procname = "numa_balancing_scan_size_mb",
387 .data = &sysctl_numa_balancing_scan_size,
388 .maxlen = sizeof(unsigned int),
390 .proc_handler = proc_dointvec_minmax,
394 .procname = "numa_balancing",
395 .data = NULL, /* filled in by handler */
396 .maxlen = sizeof(unsigned int),
398 .proc_handler = sysctl_numa_balancing,
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
405 .procname = "sched_rt_period_us",
406 .data = &sysctl_sched_rt_period,
407 .maxlen = sizeof(unsigned int),
409 .proc_handler = sched_rt_handler,
412 .procname = "sched_rt_runtime_us",
413 .data = &sysctl_sched_rt_runtime,
414 .maxlen = sizeof(int),
416 .proc_handler = sched_rt_handler,
419 .procname = "sched_rr_timeslice_ms",
420 .data = &sched_rr_timeslice,
421 .maxlen = sizeof(int),
423 .proc_handler = sched_rr_handler,
425 #ifdef CONFIG_SCHED_AUTOGROUP
427 .procname = "sched_autogroup_enabled",
428 .data = &sysctl_sched_autogroup_enabled,
429 .maxlen = sizeof(unsigned int),
431 .proc_handler = proc_dointvec_minmax,
436 #ifdef CONFIG_CFS_BANDWIDTH
438 .procname = "sched_cfs_bandwidth_slice_us",
439 .data = &sysctl_sched_cfs_bandwidth_slice,
440 .maxlen = sizeof(unsigned int),
442 .proc_handler = proc_dointvec_minmax,
446 #ifdef CONFIG_PROVE_LOCKING
448 .procname = "prove_locking",
449 .data = &prove_locking,
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec,
455 #ifdef CONFIG_LOCK_STAT
457 .procname = "lock_stat",
459 .maxlen = sizeof(int),
461 .proc_handler = proc_dointvec,
466 .data = &panic_timeout,
467 .maxlen = sizeof(int),
469 .proc_handler = proc_dointvec,
471 #ifdef CONFIG_COREDUMP
473 .procname = "core_uses_pid",
474 .data = &core_uses_pid,
475 .maxlen = sizeof(int),
477 .proc_handler = proc_dointvec,
480 .procname = "core_pattern",
481 .data = core_pattern,
482 .maxlen = CORENAME_MAX_SIZE,
484 .proc_handler = proc_dostring_coredump,
487 .procname = "core_pipe_limit",
488 .data = &core_pipe_limit,
489 .maxlen = sizeof(unsigned int),
491 .proc_handler = proc_dointvec,
494 #ifdef CONFIG_PROC_SYSCTL
496 .procname = "tainted",
497 .maxlen = sizeof(long),
499 .proc_handler = proc_taint,
502 .procname = "sysctl_writes_strict",
503 .data = &sysctl_writes_strict,
504 .maxlen = sizeof(int),
506 .proc_handler = proc_dointvec_minmax,
511 #ifdef CONFIG_LATENCYTOP
513 .procname = "latencytop",
514 .data = &latencytop_enabled,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec,
520 #ifdef CONFIG_BLK_DEV_INITRD
522 .procname = "real-root-dev",
523 .data = &real_root_dev,
524 .maxlen = sizeof(int),
526 .proc_handler = proc_dointvec,
530 .procname = "print-fatal-signals",
531 .data = &print_fatal_signals,
532 .maxlen = sizeof(int),
534 .proc_handler = proc_dointvec,
538 .procname = "reboot-cmd",
539 .data = reboot_command,
542 .proc_handler = proc_dostring,
545 .procname = "stop-a",
546 .data = &stop_a_enabled,
547 .maxlen = sizeof (int),
549 .proc_handler = proc_dointvec,
552 .procname = "scons-poweroff",
553 .data = &scons_pwroff,
554 .maxlen = sizeof (int),
556 .proc_handler = proc_dointvec,
559 #ifdef CONFIG_SPARC64
561 .procname = "tsb-ratio",
562 .data = &sysctl_tsb_ratio,
563 .maxlen = sizeof (int),
565 .proc_handler = proc_dointvec,
570 .procname = "soft-power",
571 .data = &pwrsw_enabled,
572 .maxlen = sizeof (int),
574 .proc_handler = proc_dointvec,
577 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
579 .procname = "unaligned-trap",
580 .data = &unaligned_enabled,
581 .maxlen = sizeof (int),
583 .proc_handler = proc_dointvec,
587 .procname = "ctrl-alt-del",
589 .maxlen = sizeof(int),
591 .proc_handler = proc_dointvec,
593 #ifdef CONFIG_FUNCTION_TRACER
595 .procname = "ftrace_enabled",
596 .data = &ftrace_enabled,
597 .maxlen = sizeof(int),
599 .proc_handler = ftrace_enable_sysctl,
602 #ifdef CONFIG_STACK_TRACER
604 .procname = "stack_tracer_enabled",
605 .data = &stack_tracer_enabled,
606 .maxlen = sizeof(int),
608 .proc_handler = stack_trace_sysctl,
611 #ifdef CONFIG_TRACING
613 .procname = "ftrace_dump_on_oops",
614 .data = &ftrace_dump_on_oops,
615 .maxlen = sizeof(int),
617 .proc_handler = proc_dointvec,
620 .procname = "traceoff_on_warning",
621 .data = &__disable_trace_on_warning,
622 .maxlen = sizeof(__disable_trace_on_warning),
624 .proc_handler = proc_dointvec,
629 .procname = "kexec_load_disabled",
630 .data = &kexec_load_disabled,
631 .maxlen = sizeof(int),
633 /* only handle a transition from default "0" to "1" */
634 .proc_handler = proc_dointvec_minmax,
639 #ifdef CONFIG_MODULES
641 .procname = "modprobe",
642 .data = &modprobe_path,
643 .maxlen = KMOD_PATH_LEN,
645 .proc_handler = proc_dostring,
648 .procname = "modules_disabled",
649 .data = &modules_disabled,
650 .maxlen = sizeof(int),
652 /* only handle a transition from default "0" to "1" */
653 .proc_handler = proc_dointvec_minmax,
658 #ifdef CONFIG_UEVENT_HELPER
660 .procname = "hotplug",
661 .data = &uevent_helper,
662 .maxlen = UEVENT_HELPER_PATH_LEN,
664 .proc_handler = proc_dostring,
667 #ifdef CONFIG_CHR_DEV_SG
669 .procname = "sg-big-buff",
670 .data = &sg_big_buff,
671 .maxlen = sizeof (int),
673 .proc_handler = proc_dointvec,
676 #ifdef CONFIG_BSD_PROCESS_ACCT
680 .maxlen = 3*sizeof(int),
682 .proc_handler = proc_dointvec,
685 #ifdef CONFIG_MAGIC_SYSRQ
688 .data = &__sysrq_enabled,
689 .maxlen = sizeof (int),
691 .proc_handler = sysrq_sysctl_handler,
694 #ifdef CONFIG_PROC_SYSCTL
696 .procname = "cad_pid",
698 .maxlen = sizeof (int),
700 .proc_handler = proc_do_cad_pid,
704 .procname = "threads-max",
705 .data = &max_threads,
706 .maxlen = sizeof(int),
708 .proc_handler = proc_dointvec,
711 .procname = "random",
713 .child = random_table,
716 .procname = "usermodehelper",
718 .child = usermodehelper_table,
721 .procname = "overflowuid",
722 .data = &overflowuid,
723 .maxlen = sizeof(int),
725 .proc_handler = proc_dointvec_minmax,
726 .extra1 = &minolduid,
727 .extra2 = &maxolduid,
730 .procname = "overflowgid",
731 .data = &overflowgid,
732 .maxlen = sizeof(int),
734 .proc_handler = proc_dointvec_minmax,
735 .extra1 = &minolduid,
736 .extra2 = &maxolduid,
739 #ifdef CONFIG_MATHEMU
741 .procname = "ieee_emulation_warnings",
742 .data = &sysctl_ieee_emulation_warnings,
743 .maxlen = sizeof(int),
745 .proc_handler = proc_dointvec,
749 .procname = "userprocess_debug",
750 .data = &show_unhandled_signals,
751 .maxlen = sizeof(int),
753 .proc_handler = proc_dointvec,
757 .procname = "pid_max",
759 .maxlen = sizeof (int),
761 .proc_handler = proc_dointvec_minmax,
762 .extra1 = &pid_max_min,
763 .extra2 = &pid_max_max,
766 .procname = "panic_on_oops",
767 .data = &panic_on_oops,
768 .maxlen = sizeof(int),
770 .proc_handler = proc_dointvec,
772 #if defined CONFIG_PRINTK
774 .procname = "printk",
775 .data = &console_loglevel,
776 .maxlen = 4*sizeof(int),
778 .proc_handler = proc_dointvec,
781 .procname = "printk_ratelimit",
782 .data = &printk_ratelimit_state.interval,
783 .maxlen = sizeof(int),
785 .proc_handler = proc_dointvec_jiffies,
788 .procname = "printk_ratelimit_burst",
789 .data = &printk_ratelimit_state.burst,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec,
795 .procname = "printk_delay",
796 .data = &printk_delay_msec,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec_minmax,
801 .extra2 = &ten_thousand,
804 .procname = "dmesg_restrict",
805 .data = &dmesg_restrict,
806 .maxlen = sizeof(int),
808 .proc_handler = proc_dointvec_minmax_sysadmin,
813 .procname = "kptr_restrict",
814 .data = &kptr_restrict,
815 .maxlen = sizeof(int),
817 .proc_handler = proc_dointvec_minmax_sysadmin,
823 .procname = "ngroups_max",
824 .data = &ngroups_max,
825 .maxlen = sizeof (int),
827 .proc_handler = proc_dointvec,
830 .procname = "cap_last_cap",
831 .data = (void *)&cap_last_cap,
832 .maxlen = sizeof(int),
834 .proc_handler = proc_dointvec,
836 #if defined(CONFIG_LOCKUP_DETECTOR)
838 .procname = "watchdog",
839 .data = &watchdog_user_enabled,
840 .maxlen = sizeof (int),
842 .proc_handler = proc_dowatchdog,
847 .procname = "watchdog_thresh",
848 .data = &watchdog_thresh,
849 .maxlen = sizeof(int),
851 .proc_handler = proc_dowatchdog,
856 .procname = "softlockup_panic",
857 .data = &softlockup_panic,
858 .maxlen = sizeof(int),
860 .proc_handler = proc_dointvec_minmax,
866 .procname = "softlockup_all_cpu_backtrace",
867 .data = &sysctl_softlockup_all_cpu_backtrace,
868 .maxlen = sizeof(int),
870 .proc_handler = proc_dointvec_minmax,
874 #endif /* CONFIG_SMP */
876 .procname = "nmi_watchdog",
877 .data = &watchdog_user_enabled,
878 .maxlen = sizeof (int),
880 .proc_handler = proc_dowatchdog,
885 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
887 .procname = "unknown_nmi_panic",
888 .data = &unknown_nmi_panic,
889 .maxlen = sizeof (int),
891 .proc_handler = proc_dointvec,
894 #if defined(CONFIG_X86)
896 .procname = "panic_on_unrecovered_nmi",
897 .data = &panic_on_unrecovered_nmi,
898 .maxlen = sizeof(int),
900 .proc_handler = proc_dointvec,
903 .procname = "panic_on_io_nmi",
904 .data = &panic_on_io_nmi,
905 .maxlen = sizeof(int),
907 .proc_handler = proc_dointvec,
909 #ifdef CONFIG_DEBUG_STACKOVERFLOW
911 .procname = "panic_on_stackoverflow",
912 .data = &sysctl_panic_on_stackoverflow,
913 .maxlen = sizeof(int),
915 .proc_handler = proc_dointvec,
919 .procname = "bootloader_type",
920 .data = &bootloader_type,
921 .maxlen = sizeof (int),
923 .proc_handler = proc_dointvec,
926 .procname = "bootloader_version",
927 .data = &bootloader_version,
928 .maxlen = sizeof (int),
930 .proc_handler = proc_dointvec,
933 .procname = "kstack_depth_to_print",
934 .data = &kstack_depth_to_print,
935 .maxlen = sizeof(int),
937 .proc_handler = proc_dointvec,
940 .procname = "io_delay_type",
941 .data = &io_delay_type,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_dointvec,
947 #if defined(CONFIG_MMU)
949 .procname = "randomize_va_space",
950 .data = &randomize_va_space,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec,
956 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
958 .procname = "spin_retry",
960 .maxlen = sizeof (int),
962 .proc_handler = proc_dointvec,
965 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
967 .procname = "acpi_video_flags",
968 .data = &acpi_realmode_flags,
969 .maxlen = sizeof (unsigned long),
971 .proc_handler = proc_doulongvec_minmax,
974 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
976 .procname = "ignore-unaligned-usertrap",
977 .data = &no_unaligned_warning,
978 .maxlen = sizeof (int),
980 .proc_handler = proc_dointvec,
985 .procname = "unaligned-dump-stack",
986 .data = &unaligned_dump_stack,
987 .maxlen = sizeof (int),
989 .proc_handler = proc_dointvec,
992 #ifdef CONFIG_DETECT_HUNG_TASK
994 .procname = "hung_task_panic",
995 .data = &sysctl_hung_task_panic,
996 .maxlen = sizeof(int),
998 .proc_handler = proc_dointvec_minmax,
1003 .procname = "hung_task_check_count",
1004 .data = &sysctl_hung_task_check_count,
1005 .maxlen = sizeof(int),
1007 .proc_handler = proc_dointvec_minmax,
1011 .procname = "hung_task_timeout_secs",
1012 .data = &sysctl_hung_task_timeout_secs,
1013 .maxlen = sizeof(unsigned long),
1015 .proc_handler = proc_dohung_task_timeout_secs,
1016 .extra2 = &hung_task_timeout_max,
1019 .procname = "hung_task_warnings",
1020 .data = &sysctl_hung_task_warnings,
1021 .maxlen = sizeof(int),
1023 .proc_handler = proc_dointvec_minmax,
1027 #ifdef CONFIG_COMPAT
1029 .procname = "compat-log",
1030 .data = &compat_log,
1031 .maxlen = sizeof (int),
1033 .proc_handler = proc_dointvec,
1036 #ifdef CONFIG_RT_MUTEXES
1038 .procname = "max_lock_depth",
1039 .data = &max_lock_depth,
1040 .maxlen = sizeof(int),
1042 .proc_handler = proc_dointvec,
1046 .procname = "poweroff_cmd",
1047 .data = &poweroff_cmd,
1048 .maxlen = POWEROFF_CMD_PATH_LEN,
1050 .proc_handler = proc_dostring,
1056 .child = key_sysctls,
1059 #ifdef CONFIG_PERF_EVENTS
1061 * User-space scripts rely on the existence of this file
1062 * as a feature check for perf_events being enabled.
1064 * So it's an ABI, do not remove!
1067 .procname = "perf_event_paranoid",
1068 .data = &sysctl_perf_event_paranoid,
1069 .maxlen = sizeof(sysctl_perf_event_paranoid),
1071 .proc_handler = proc_dointvec,
1074 .procname = "perf_event_mlock_kb",
1075 .data = &sysctl_perf_event_mlock,
1076 .maxlen = sizeof(sysctl_perf_event_mlock),
1078 .proc_handler = proc_dointvec,
1081 .procname = "perf_event_max_sample_rate",
1082 .data = &sysctl_perf_event_sample_rate,
1083 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1085 .proc_handler = perf_proc_update_handler,
1089 .procname = "perf_cpu_time_max_percent",
1090 .data = &sysctl_perf_cpu_time_max_percent,
1091 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1093 .proc_handler = perf_cpu_time_max_percent_handler,
1095 .extra2 = &one_hundred,
1098 #ifdef CONFIG_KMEMCHECK
1100 .procname = "kmemcheck",
1101 .data = &kmemcheck_enabled,
1102 .maxlen = sizeof(int),
1104 .proc_handler = proc_dointvec,
1108 .procname = "panic_on_warn",
1109 .data = &panic_on_warn,
1110 .maxlen = sizeof(int),
1112 .proc_handler = proc_dointvec_minmax,
1119 static struct ctl_table vm_table[] = {
1121 .procname = "overcommit_memory",
1122 .data = &sysctl_overcommit_memory,
1123 .maxlen = sizeof(sysctl_overcommit_memory),
1125 .proc_handler = proc_dointvec_minmax,
1130 .procname = "panic_on_oom",
1131 .data = &sysctl_panic_on_oom,
1132 .maxlen = sizeof(sysctl_panic_on_oom),
1134 .proc_handler = proc_dointvec_minmax,
1139 .procname = "oom_kill_allocating_task",
1140 .data = &sysctl_oom_kill_allocating_task,
1141 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1143 .proc_handler = proc_dointvec,
1146 .procname = "oom_dump_tasks",
1147 .data = &sysctl_oom_dump_tasks,
1148 .maxlen = sizeof(sysctl_oom_dump_tasks),
1150 .proc_handler = proc_dointvec,
1153 .procname = "overcommit_ratio",
1154 .data = &sysctl_overcommit_ratio,
1155 .maxlen = sizeof(sysctl_overcommit_ratio),
1157 .proc_handler = overcommit_ratio_handler,
1160 .procname = "overcommit_kbytes",
1161 .data = &sysctl_overcommit_kbytes,
1162 .maxlen = sizeof(sysctl_overcommit_kbytes),
1164 .proc_handler = overcommit_kbytes_handler,
1167 .procname = "page-cluster",
1168 .data = &page_cluster,
1169 .maxlen = sizeof(int),
1171 .proc_handler = proc_dointvec_minmax,
1175 .procname = "dirty_background_ratio",
1176 .data = &dirty_background_ratio,
1177 .maxlen = sizeof(dirty_background_ratio),
1179 .proc_handler = dirty_background_ratio_handler,
1181 .extra2 = &one_hundred,
1184 .procname = "dirty_background_bytes",
1185 .data = &dirty_background_bytes,
1186 .maxlen = sizeof(dirty_background_bytes),
1188 .proc_handler = dirty_background_bytes_handler,
1192 .procname = "dirty_ratio",
1193 .data = &vm_dirty_ratio,
1194 .maxlen = sizeof(vm_dirty_ratio),
1196 .proc_handler = dirty_ratio_handler,
1198 .extra2 = &one_hundred,
1201 .procname = "dirty_bytes",
1202 .data = &vm_dirty_bytes,
1203 .maxlen = sizeof(vm_dirty_bytes),
1205 .proc_handler = dirty_bytes_handler,
1206 .extra1 = &dirty_bytes_min,
1209 .procname = "dirty_writeback_centisecs",
1210 .data = &dirty_writeback_interval,
1211 .maxlen = sizeof(dirty_writeback_interval),
1213 .proc_handler = dirty_writeback_centisecs_handler,
1216 .procname = "dirty_expire_centisecs",
1217 .data = &dirty_expire_interval,
1218 .maxlen = sizeof(dirty_expire_interval),
1220 .proc_handler = proc_dointvec_minmax,
1224 .procname = "nr_pdflush_threads",
1225 .mode = 0444 /* read-only */,
1226 .proc_handler = pdflush_proc_obsolete,
1229 .procname = "swappiness",
1230 .data = &vm_swappiness,
1231 .maxlen = sizeof(vm_swappiness),
1233 .proc_handler = proc_dointvec_minmax,
1235 .extra2 = &one_hundred,
1237 #ifdef CONFIG_HUGETLB_PAGE
1239 .procname = "nr_hugepages",
1241 .maxlen = sizeof(unsigned long),
1243 .proc_handler = hugetlb_sysctl_handler,
1248 .procname = "nr_hugepages_mempolicy",
1250 .maxlen = sizeof(unsigned long),
1252 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1257 .procname = "hugetlb_shm_group",
1258 .data = &sysctl_hugetlb_shm_group,
1259 .maxlen = sizeof(gid_t),
1261 .proc_handler = proc_dointvec,
1264 .procname = "hugepages_treat_as_movable",
1265 .data = &hugepages_treat_as_movable,
1266 .maxlen = sizeof(int),
1268 .proc_handler = proc_dointvec,
1271 .procname = "nr_overcommit_hugepages",
1273 .maxlen = sizeof(unsigned long),
1275 .proc_handler = hugetlb_overcommit_handler,
1280 .procname = "lowmem_reserve_ratio",
1281 .data = &sysctl_lowmem_reserve_ratio,
1282 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1284 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1287 .procname = "drop_caches",
1288 .data = &sysctl_drop_caches,
1289 .maxlen = sizeof(int),
1291 .proc_handler = drop_caches_sysctl_handler,
1295 #ifdef CONFIG_COMPACTION
1297 .procname = "compact_memory",
1298 .data = &sysctl_compact_memory,
1299 .maxlen = sizeof(int),
1301 .proc_handler = sysctl_compaction_handler,
1304 .procname = "extfrag_threshold",
1305 .data = &sysctl_extfrag_threshold,
1306 .maxlen = sizeof(int),
1308 .proc_handler = sysctl_extfrag_handler,
1309 .extra1 = &min_extfrag_threshold,
1310 .extra2 = &max_extfrag_threshold,
1313 #endif /* CONFIG_COMPACTION */
1315 .procname = "min_free_kbytes",
1316 .data = &min_free_kbytes,
1317 .maxlen = sizeof(min_free_kbytes),
1319 .proc_handler = min_free_kbytes_sysctl_handler,
1323 .procname = "percpu_pagelist_fraction",
1324 .data = &percpu_pagelist_fraction,
1325 .maxlen = sizeof(percpu_pagelist_fraction),
1327 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1332 .procname = "max_map_count",
1333 .data = &sysctl_max_map_count,
1334 .maxlen = sizeof(sysctl_max_map_count),
1336 .proc_handler = proc_dointvec_minmax,
1341 .procname = "nr_trim_pages",
1342 .data = &sysctl_nr_trim_pages,
1343 .maxlen = sizeof(sysctl_nr_trim_pages),
1345 .proc_handler = proc_dointvec_minmax,
1350 .procname = "laptop_mode",
1351 .data = &laptop_mode,
1352 .maxlen = sizeof(laptop_mode),
1354 .proc_handler = proc_dointvec_jiffies,
1357 .procname = "block_dump",
1358 .data = &block_dump,
1359 .maxlen = sizeof(block_dump),
1361 .proc_handler = proc_dointvec,
1365 .procname = "vfs_cache_pressure",
1366 .data = &sysctl_vfs_cache_pressure,
1367 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1369 .proc_handler = proc_dointvec,
1372 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1374 .procname = "legacy_va_layout",
1375 .data = &sysctl_legacy_va_layout,
1376 .maxlen = sizeof(sysctl_legacy_va_layout),
1378 .proc_handler = proc_dointvec,
1384 .procname = "zone_reclaim_mode",
1385 .data = &zone_reclaim_mode,
1386 .maxlen = sizeof(zone_reclaim_mode),
1388 .proc_handler = proc_dointvec,
1392 .procname = "min_unmapped_ratio",
1393 .data = &sysctl_min_unmapped_ratio,
1394 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1396 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1398 .extra2 = &one_hundred,
1401 .procname = "min_slab_ratio",
1402 .data = &sysctl_min_slab_ratio,
1403 .maxlen = sizeof(sysctl_min_slab_ratio),
1405 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1407 .extra2 = &one_hundred,
1412 .procname = "stat_interval",
1413 .data = &sysctl_stat_interval,
1414 .maxlen = sizeof(sysctl_stat_interval),
1416 .proc_handler = proc_dointvec_jiffies,
1421 .procname = "mmap_min_addr",
1422 .data = &dac_mmap_min_addr,
1423 .maxlen = sizeof(unsigned long),
1425 .proc_handler = mmap_min_addr_handler,
1430 .procname = "numa_zonelist_order",
1431 .data = &numa_zonelist_order,
1432 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1434 .proc_handler = numa_zonelist_order_handler,
1437 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1438 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1440 .procname = "vdso_enabled",
1441 #ifdef CONFIG_X86_32
1442 .data = &vdso32_enabled,
1443 .maxlen = sizeof(vdso32_enabled),
1445 .data = &vdso_enabled,
1446 .maxlen = sizeof(vdso_enabled),
1449 .proc_handler = proc_dointvec,
1453 #ifdef CONFIG_HIGHMEM
1455 .procname = "highmem_is_dirtyable",
1456 .data = &vm_highmem_is_dirtyable,
1457 .maxlen = sizeof(vm_highmem_is_dirtyable),
1459 .proc_handler = proc_dointvec_minmax,
1464 #ifdef CONFIG_MEMORY_FAILURE
1466 .procname = "memory_failure_early_kill",
1467 .data = &sysctl_memory_failure_early_kill,
1468 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1470 .proc_handler = proc_dointvec_minmax,
1475 .procname = "memory_failure_recovery",
1476 .data = &sysctl_memory_failure_recovery,
1477 .maxlen = sizeof(sysctl_memory_failure_recovery),
1479 .proc_handler = proc_dointvec_minmax,
1485 .procname = "user_reserve_kbytes",
1486 .data = &sysctl_user_reserve_kbytes,
1487 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1489 .proc_handler = proc_doulongvec_minmax,
1492 .procname = "admin_reserve_kbytes",
1493 .data = &sysctl_admin_reserve_kbytes,
1494 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1496 .proc_handler = proc_doulongvec_minmax,
1501 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1502 static struct ctl_table binfmt_misc_table[] = {
1507 static struct ctl_table fs_table[] = {
1509 .procname = "inode-nr",
1510 .data = &inodes_stat,
1511 .maxlen = 2*sizeof(long),
1513 .proc_handler = proc_nr_inodes,
1516 .procname = "inode-state",
1517 .data = &inodes_stat,
1518 .maxlen = 7*sizeof(long),
1520 .proc_handler = proc_nr_inodes,
1523 .procname = "file-nr",
1524 .data = &files_stat,
1525 .maxlen = sizeof(files_stat),
1527 .proc_handler = proc_nr_files,
1530 .procname = "file-max",
1531 .data = &files_stat.max_files,
1532 .maxlen = sizeof(files_stat.max_files),
1534 .proc_handler = proc_doulongvec_minmax,
1537 .procname = "nr_open",
1538 .data = &sysctl_nr_open,
1539 .maxlen = sizeof(int),
1541 .proc_handler = proc_dointvec_minmax,
1542 .extra1 = &sysctl_nr_open_min,
1543 .extra2 = &sysctl_nr_open_max,
1546 .procname = "dentry-state",
1547 .data = &dentry_stat,
1548 .maxlen = 6*sizeof(long),
1550 .proc_handler = proc_nr_dentry,
1553 .procname = "overflowuid",
1554 .data = &fs_overflowuid,
1555 .maxlen = sizeof(int),
1557 .proc_handler = proc_dointvec_minmax,
1558 .extra1 = &minolduid,
1559 .extra2 = &maxolduid,
1562 .procname = "overflowgid",
1563 .data = &fs_overflowgid,
1564 .maxlen = sizeof(int),
1566 .proc_handler = proc_dointvec_minmax,
1567 .extra1 = &minolduid,
1568 .extra2 = &maxolduid,
1570 #ifdef CONFIG_FILE_LOCKING
1572 .procname = "leases-enable",
1573 .data = &leases_enable,
1574 .maxlen = sizeof(int),
1576 .proc_handler = proc_dointvec,
1579 #ifdef CONFIG_DNOTIFY
1581 .procname = "dir-notify-enable",
1582 .data = &dir_notify_enable,
1583 .maxlen = sizeof(int),
1585 .proc_handler = proc_dointvec,
1589 #ifdef CONFIG_FILE_LOCKING
1591 .procname = "lease-break-time",
1592 .data = &lease_break_time,
1593 .maxlen = sizeof(int),
1595 .proc_handler = proc_dointvec,
1600 .procname = "aio-nr",
1602 .maxlen = sizeof(aio_nr),
1604 .proc_handler = proc_doulongvec_minmax,
1607 .procname = "aio-max-nr",
1608 .data = &aio_max_nr,
1609 .maxlen = sizeof(aio_max_nr),
1611 .proc_handler = proc_doulongvec_minmax,
1613 #endif /* CONFIG_AIO */
1614 #ifdef CONFIG_INOTIFY_USER
1616 .procname = "inotify",
1618 .child = inotify_table,
1623 .procname = "epoll",
1625 .child = epoll_table,
1630 .procname = "protected_symlinks",
1631 .data = &sysctl_protected_symlinks,
1632 .maxlen = sizeof(int),
1634 .proc_handler = proc_dointvec_minmax,
1639 .procname = "protected_hardlinks",
1640 .data = &sysctl_protected_hardlinks,
1641 .maxlen = sizeof(int),
1643 .proc_handler = proc_dointvec_minmax,
1648 .procname = "suid_dumpable",
1649 .data = &suid_dumpable,
1650 .maxlen = sizeof(int),
1652 .proc_handler = proc_dointvec_minmax_coredump,
1656 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1658 .procname = "binfmt_misc",
1660 .child = binfmt_misc_table,
1664 .procname = "pipe-max-size",
1665 .data = &pipe_max_size,
1666 .maxlen = sizeof(int),
1668 .proc_handler = &pipe_proc_fn,
1669 .extra1 = &pipe_min_size,
1674 static struct ctl_table debug_table[] = {
1675 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1677 .procname = "exception-trace",
1678 .data = &show_unhandled_signals,
1679 .maxlen = sizeof(int),
1681 .proc_handler = proc_dointvec
1684 #if defined(CONFIG_OPTPROBES)
1686 .procname = "kprobes-optimization",
1687 .data = &sysctl_kprobes_optimization,
1688 .maxlen = sizeof(int),
1690 .proc_handler = proc_kprobes_optimization_handler,
1698 static struct ctl_table dev_table[] = {
1702 int __init sysctl_init(void)
1704 struct ctl_table_header *hdr;
1706 hdr = register_sysctl_table(sysctl_base_table);
1707 kmemleak_not_leak(hdr);
1711 #endif /* CONFIG_SYSCTL */
1717 #ifdef CONFIG_PROC_SYSCTL
1719 static int _proc_do_string(char *data, int maxlen, int write,
1720 char __user *buffer,
1721 size_t *lenp, loff_t *ppos)
1727 if (!data || !maxlen || !*lenp) {
1733 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1734 /* Only continue writes not past the end of buffer. */
1736 if (len > maxlen - 1)
1743 /* Start writing from beginning of buffer. */
1749 while ((p - buffer) < *lenp && len < maxlen - 1) {
1750 if (get_user(c, p++))
1752 if (c == 0 || c == '\n')
1773 if (copy_to_user(buffer, data, len))
1776 if (put_user('\n', buffer + len))
1786 static void warn_sysctl_write(struct ctl_table *table)
1788 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1789 "This will not be supported in the future. To silence this\n"
1790 "warning, set kernel.sysctl_writes_strict = -1\n",
1791 current->comm, table->procname);
1795 * proc_dostring - read a string sysctl
1796 * @table: the sysctl table
1797 * @write: %TRUE if this is a write to the sysctl file
1798 * @buffer: the user buffer
1799 * @lenp: the size of the user buffer
1800 * @ppos: file position
1802 * Reads/writes a string from/to the user buffer. If the kernel
1803 * buffer provided is not large enough to hold the string, the
1804 * string is truncated. The copied string is %NULL-terminated.
1805 * If the string is being read by the user process, it is copied
1806 * and a newline '\n' is added. It is truncated if the buffer is
1809 * Returns 0 on success.
1811 int proc_dostring(struct ctl_table *table, int write,
1812 void __user *buffer, size_t *lenp, loff_t *ppos)
1814 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1815 warn_sysctl_write(table);
1817 return _proc_do_string((char *)(table->data), table->maxlen, write,
1818 (char __user *)buffer, lenp, ppos);
1821 static size_t proc_skip_spaces(char **buf)
1824 char *tmp = skip_spaces(*buf);
1830 static void proc_skip_char(char **buf, size_t *size, const char v)
1840 #define TMPBUFLEN 22
1842 * proc_get_long - reads an ASCII formatted integer from a user buffer
1844 * @buf: a kernel buffer
1845 * @size: size of the kernel buffer
1846 * @val: this is where the number will be stored
1847 * @neg: set to %TRUE if number is negative
1848 * @perm_tr: a vector which contains the allowed trailers
1849 * @perm_tr_len: size of the perm_tr vector
1850 * @tr: pointer to store the trailer character
1852 * In case of success %0 is returned and @buf and @size are updated with
1853 * the amount of bytes read. If @tr is non-NULL and a trailing
1854 * character exists (size is non-zero after returning from this
1855 * function), @tr is updated with the trailing character.
1857 static int proc_get_long(char **buf, size_t *size,
1858 unsigned long *val, bool *neg,
1859 const char *perm_tr, unsigned perm_tr_len, char *tr)
1862 char *p, tmp[TMPBUFLEN];
1868 if (len > TMPBUFLEN - 1)
1869 len = TMPBUFLEN - 1;
1871 memcpy(tmp, *buf, len);
1875 if (*p == '-' && *size > 1) {
1883 *val = simple_strtoul(p, &p, 0);
1887 /* We don't know if the next char is whitespace thus we may accept
1888 * invalid integers (e.g. 1234...a) or two integers instead of one
1889 * (e.g. 123...1). So lets not allow such large numbers. */
1890 if (len == TMPBUFLEN - 1)
1893 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1896 if (tr && (len < *size))
1906 * proc_put_long - converts an integer to a decimal ASCII formatted string
1908 * @buf: the user buffer
1909 * @size: the size of the user buffer
1910 * @val: the integer to be converted
1911 * @neg: sign of the number, %TRUE for negative
1913 * In case of success %0 is returned and @buf and @size are updated with
1914 * the amount of bytes written.
1916 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1920 char tmp[TMPBUFLEN], *p = tmp;
1922 sprintf(p, "%s%lu", neg ? "-" : "", val);
1926 if (copy_to_user(*buf, tmp, len))
1934 static int proc_put_char(void __user **buf, size_t *size, char c)
1937 char __user **buffer = (char __user **)buf;
1938 if (put_user(c, *buffer))
1940 (*size)--, (*buffer)++;
1946 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1948 int write, void *data)
1951 *valp = *negp ? -*lvalp : *lvalp;
1956 *lvalp = (unsigned long)-val;
1959 *lvalp = (unsigned long)val;
1965 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1967 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1968 int write, void __user *buffer,
1969 size_t *lenp, loff_t *ppos,
1970 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1971 int write, void *data),
1974 int *i, vleft, first = 1, err = 0;
1975 unsigned long page = 0;
1979 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1984 i = (int *) tbl_data;
1985 vleft = table->maxlen / sizeof(*i);
1989 conv = do_proc_dointvec_conv;
1993 switch (sysctl_writes_strict) {
1994 case SYSCTL_WRITES_STRICT:
1996 case SYSCTL_WRITES_WARN:
1997 warn_sysctl_write(table);
2004 if (left > PAGE_SIZE - 1)
2005 left = PAGE_SIZE - 1;
2006 page = __get_free_page(GFP_TEMPORARY);
2007 kbuf = (char *) page;
2010 if (copy_from_user(kbuf, buffer, left)) {
2017 for (; left && vleft--; i++, first=0) {
2022 left -= proc_skip_spaces(&kbuf);
2026 err = proc_get_long(&kbuf, &left, &lval, &neg,
2028 sizeof(proc_wspace_sep), NULL);
2031 if (conv(&neg, &lval, i, 1, data)) {
2036 if (conv(&neg, &lval, i, 0, data)) {
2041 err = proc_put_char(&buffer, &left, '\t');
2044 err = proc_put_long(&buffer, &left, lval, neg);
2050 if (!write && !first && left && !err)
2051 err = proc_put_char(&buffer, &left, '\n');
2052 if (write && !err && left)
2053 left -= proc_skip_spaces(&kbuf);
2058 return err ? : -EINVAL;
2066 static int do_proc_dointvec(struct ctl_table *table, int write,
2067 void __user *buffer, size_t *lenp, loff_t *ppos,
2068 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2069 int write, void *data),
2072 return __do_proc_dointvec(table->data, table, write,
2073 buffer, lenp, ppos, conv, data);
2077 * proc_dointvec - read a vector of integers
2078 * @table: the sysctl table
2079 * @write: %TRUE if this is a write to the sysctl file
2080 * @buffer: the user buffer
2081 * @lenp: the size of the user buffer
2082 * @ppos: file position
2084 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2085 * values from/to the user buffer, treated as an ASCII string.
2087 * Returns 0 on success.
2089 int proc_dointvec(struct ctl_table *table, int write,
2090 void __user *buffer, size_t *lenp, loff_t *ppos)
2092 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2097 * Taint values can only be increased
2098 * This means we can safely use a temporary.
2100 static int proc_taint(struct ctl_table *table, int write,
2101 void __user *buffer, size_t *lenp, loff_t *ppos)
2104 unsigned long tmptaint = get_taint();
2107 if (write && !capable(CAP_SYS_ADMIN))
2112 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2118 * Poor man's atomic or. Not worth adding a primitive
2119 * to everyone's atomic.h for this
2122 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2123 if ((tmptaint >> i) & 1)
2124 add_taint(i, LOCKDEP_STILL_OK);
2131 #ifdef CONFIG_PRINTK
2132 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2133 void __user *buffer, size_t *lenp, loff_t *ppos)
2135 if (write && !capable(CAP_SYS_ADMIN))
2138 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2142 struct do_proc_dointvec_minmax_conv_param {
2147 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2149 int write, void *data)
2151 struct do_proc_dointvec_minmax_conv_param *param = data;
2153 int val = *negp ? -*lvalp : *lvalp;
2154 if ((param->min && *param->min > val) ||
2155 (param->max && *param->max < val))
2162 *lvalp = (unsigned long)-val;
2165 *lvalp = (unsigned long)val;
2172 * proc_dointvec_minmax - read a vector of integers with min/max values
2173 * @table: the sysctl table
2174 * @write: %TRUE if this is a write to the sysctl file
2175 * @buffer: the user buffer
2176 * @lenp: the size of the user buffer
2177 * @ppos: file position
2179 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2180 * values from/to the user buffer, treated as an ASCII string.
2182 * This routine will ensure the values are within the range specified by
2183 * table->extra1 (min) and table->extra2 (max).
2185 * Returns 0 on success.
2187 int proc_dointvec_minmax(struct ctl_table *table, int write,
2188 void __user *buffer, size_t *lenp, loff_t *ppos)
2190 struct do_proc_dointvec_minmax_conv_param param = {
2191 .min = (int *) table->extra1,
2192 .max = (int *) table->extra2,
2194 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2195 do_proc_dointvec_minmax_conv, ¶m);
2198 static void validate_coredump_safety(void)
2200 #ifdef CONFIG_COREDUMP
2201 if (suid_dumpable == SUID_DUMP_ROOT &&
2202 core_pattern[0] != '/' && core_pattern[0] != '|') {
2203 printk(KERN_WARNING "Unsafe core_pattern used with "\
2204 "suid_dumpable=2. Pipe handler or fully qualified "\
2205 "core dump path required.\n");
2210 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2211 void __user *buffer, size_t *lenp, loff_t *ppos)
2213 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2215 validate_coredump_safety();
2219 #ifdef CONFIG_COREDUMP
2220 static int proc_dostring_coredump(struct ctl_table *table, int write,
2221 void __user *buffer, size_t *lenp, loff_t *ppos)
2223 int error = proc_dostring(table, write, buffer, lenp, ppos);
2225 validate_coredump_safety();
2230 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2231 void __user *buffer,
2232 size_t *lenp, loff_t *ppos,
2233 unsigned long convmul,
2234 unsigned long convdiv)
2236 unsigned long *i, *min, *max;
2237 int vleft, first = 1, err = 0;
2238 unsigned long page = 0;
2242 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2247 i = (unsigned long *) data;
2248 min = (unsigned long *) table->extra1;
2249 max = (unsigned long *) table->extra2;
2250 vleft = table->maxlen / sizeof(unsigned long);
2255 switch (sysctl_writes_strict) {
2256 case SYSCTL_WRITES_STRICT:
2258 case SYSCTL_WRITES_WARN:
2259 warn_sysctl_write(table);
2266 if (left > PAGE_SIZE - 1)
2267 left = PAGE_SIZE - 1;
2268 page = __get_free_page(GFP_TEMPORARY);
2269 kbuf = (char *) page;
2272 if (copy_from_user(kbuf, buffer, left)) {
2279 for (; left && vleft--; i++, first = 0) {
2285 left -= proc_skip_spaces(&kbuf);
2287 err = proc_get_long(&kbuf, &left, &val, &neg,
2289 sizeof(proc_wspace_sep), NULL);
2294 if ((min && val < *min) || (max && val > *max))
2298 val = convdiv * (*i) / convmul;
2300 err = proc_put_char(&buffer, &left, '\t');
2304 err = proc_put_long(&buffer, &left, val, false);
2310 if (!write && !first && left && !err)
2311 err = proc_put_char(&buffer, &left, '\n');
2313 left -= proc_skip_spaces(&kbuf);
2318 return err ? : -EINVAL;
2326 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2327 void __user *buffer,
2328 size_t *lenp, loff_t *ppos,
2329 unsigned long convmul,
2330 unsigned long convdiv)
2332 return __do_proc_doulongvec_minmax(table->data, table, write,
2333 buffer, lenp, ppos, convmul, convdiv);
2337 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2338 * @table: the sysctl table
2339 * @write: %TRUE if this is a write to the sysctl file
2340 * @buffer: the user buffer
2341 * @lenp: the size of the user buffer
2342 * @ppos: file position
2344 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2345 * values from/to the user buffer, treated as an ASCII string.
2347 * This routine will ensure the values are within the range specified by
2348 * table->extra1 (min) and table->extra2 (max).
2350 * Returns 0 on success.
2352 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2353 void __user *buffer, size_t *lenp, loff_t *ppos)
2355 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2359 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2360 * @table: the sysctl table
2361 * @write: %TRUE if this is a write to the sysctl file
2362 * @buffer: the user buffer
2363 * @lenp: the size of the user buffer
2364 * @ppos: file position
2366 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2367 * values from/to the user buffer, treated as an ASCII string. The values
2368 * are treated as milliseconds, and converted to jiffies when they are stored.
2370 * This routine will ensure the values are within the range specified by
2371 * table->extra1 (min) and table->extra2 (max).
2373 * Returns 0 on success.
2375 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2376 void __user *buffer,
2377 size_t *lenp, loff_t *ppos)
2379 return do_proc_doulongvec_minmax(table, write, buffer,
2380 lenp, ppos, HZ, 1000l);
2384 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2386 int write, void *data)
2389 if (*lvalp > LONG_MAX / HZ)
2391 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2397 lval = (unsigned long)-val;
2400 lval = (unsigned long)val;
2407 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2409 int write, void *data)
2412 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2414 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2420 lval = (unsigned long)-val;
2423 lval = (unsigned long)val;
2425 *lvalp = jiffies_to_clock_t(lval);
2430 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2432 int write, void *data)
2435 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2445 lval = (unsigned long)-val;
2448 lval = (unsigned long)val;
2450 *lvalp = jiffies_to_msecs(lval);
2456 * proc_dointvec_jiffies - read a vector of integers as seconds
2457 * @table: the sysctl table
2458 * @write: %TRUE if this is a write to the sysctl file
2459 * @buffer: the user buffer
2460 * @lenp: the size of the user buffer
2461 * @ppos: file position
2463 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2464 * values from/to the user buffer, treated as an ASCII string.
2465 * The values read are assumed to be in seconds, and are converted into
2468 * Returns 0 on success.
2470 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2471 void __user *buffer, size_t *lenp, loff_t *ppos)
2473 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2474 do_proc_dointvec_jiffies_conv,NULL);
2478 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2479 * @table: the sysctl table
2480 * @write: %TRUE if this is a write to the sysctl file
2481 * @buffer: the user buffer
2482 * @lenp: the size of the user buffer
2483 * @ppos: pointer to the file position
2485 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2486 * values from/to the user buffer, treated as an ASCII string.
2487 * The values read are assumed to be in 1/USER_HZ seconds, and
2488 * are converted into jiffies.
2490 * Returns 0 on success.
2492 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2495 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2496 do_proc_dointvec_userhz_jiffies_conv,NULL);
2500 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2501 * @table: the sysctl table
2502 * @write: %TRUE if this is a write to the sysctl file
2503 * @buffer: the user buffer
2504 * @lenp: the size of the user buffer
2505 * @ppos: file position
2506 * @ppos: the current position in the file
2508 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2509 * values from/to the user buffer, treated as an ASCII string.
2510 * The values read are assumed to be in 1/1000 seconds, and
2511 * are converted into jiffies.
2513 * Returns 0 on success.
2515 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2516 void __user *buffer, size_t *lenp, loff_t *ppos)
2518 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2519 do_proc_dointvec_ms_jiffies_conv, NULL);
2522 static int proc_do_cad_pid(struct ctl_table *table, int write,
2523 void __user *buffer, size_t *lenp, loff_t *ppos)
2525 struct pid *new_pid;
2529 tmp = pid_vnr(cad_pid);
2531 r = __do_proc_dointvec(&tmp, table, write, buffer,
2532 lenp, ppos, NULL, NULL);
2536 new_pid = find_get_pid(tmp);
2540 put_pid(xchg(&cad_pid, new_pid));
2545 * proc_do_large_bitmap - read/write from/to a large bitmap
2546 * @table: the sysctl table
2547 * @write: %TRUE if this is a write to the sysctl file
2548 * @buffer: the user buffer
2549 * @lenp: the size of the user buffer
2550 * @ppos: file position
2552 * The bitmap is stored at table->data and the bitmap length (in bits)
2555 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2556 * large bitmaps may be represented in a compact manner. Writing into
2557 * the file will clear the bitmap then update it with the given input.
2559 * Returns 0 on success.
2561 int proc_do_large_bitmap(struct ctl_table *table, int write,
2562 void __user *buffer, size_t *lenp, loff_t *ppos)
2566 size_t left = *lenp;
2567 unsigned long bitmap_len = table->maxlen;
2568 unsigned long *bitmap = *(unsigned long **) table->data;
2569 unsigned long *tmp_bitmap = NULL;
2570 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2572 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2578 unsigned long page = 0;
2581 if (left > PAGE_SIZE - 1)
2582 left = PAGE_SIZE - 1;
2584 page = __get_free_page(GFP_TEMPORARY);
2585 kbuf = (char *) page;
2588 if (copy_from_user(kbuf, buffer, left)) {
2594 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2600 proc_skip_char(&kbuf, &left, '\n');
2601 while (!err && left) {
2602 unsigned long val_a, val_b;
2605 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2609 if (val_a >= bitmap_len || neg) {
2621 err = proc_get_long(&kbuf, &left, &val_b,
2622 &neg, tr_b, sizeof(tr_b),
2626 if (val_b >= bitmap_len || neg ||
2637 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2639 proc_skip_char(&kbuf, &left, '\n');
2643 unsigned long bit_a, bit_b = 0;
2646 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2647 if (bit_a >= bitmap_len)
2649 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2653 err = proc_put_char(&buffer, &left, ',');
2657 err = proc_put_long(&buffer, &left, bit_a, false);
2660 if (bit_a != bit_b) {
2661 err = proc_put_char(&buffer, &left, '-');
2664 err = proc_put_long(&buffer, &left, bit_b, false);
2672 err = proc_put_char(&buffer, &left, '\n');
2678 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2680 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2692 #else /* CONFIG_PROC_SYSCTL */
2694 int proc_dostring(struct ctl_table *table, int write,
2695 void __user *buffer, size_t *lenp, loff_t *ppos)
2700 int proc_dointvec(struct ctl_table *table, int write,
2701 void __user *buffer, size_t *lenp, loff_t *ppos)
2706 int proc_dointvec_minmax(struct ctl_table *table, int write,
2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2712 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2713 void __user *buffer, size_t *lenp, loff_t *ppos)
2718 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2719 void __user *buffer, size_t *lenp, loff_t *ppos)
2724 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2725 void __user *buffer, size_t *lenp, loff_t *ppos)
2730 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2731 void __user *buffer, size_t *lenp, loff_t *ppos)
2736 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2737 void __user *buffer,
2738 size_t *lenp, loff_t *ppos)
2744 #endif /* CONFIG_PROC_SYSCTL */
2747 * No sense putting this after each symbol definition, twice,
2748 * exception granted :-)
2750 EXPORT_SYMBOL(proc_dointvec);
2751 EXPORT_SYMBOL(proc_dointvec_jiffies);
2752 EXPORT_SYMBOL(proc_dointvec_minmax);
2753 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2754 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2755 EXPORT_SYMBOL(proc_dostring);
2756 EXPORT_SYMBOL(proc_doulongvec_minmax);
2757 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);