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,
627 .procname = "tracepoint_printk",
628 .data = &tracepoint_printk,
629 .maxlen = sizeof(tracepoint_printk),
631 .proc_handler = proc_dointvec,
636 .procname = "kexec_load_disabled",
637 .data = &kexec_load_disabled,
638 .maxlen = sizeof(int),
640 /* only handle a transition from default "0" to "1" */
641 .proc_handler = proc_dointvec_minmax,
646 #ifdef CONFIG_MODULES
648 .procname = "modprobe",
649 .data = &modprobe_path,
650 .maxlen = KMOD_PATH_LEN,
652 .proc_handler = proc_dostring,
655 .procname = "modules_disabled",
656 .data = &modules_disabled,
657 .maxlen = sizeof(int),
659 /* only handle a transition from default "0" to "1" */
660 .proc_handler = proc_dointvec_minmax,
665 #ifdef CONFIG_UEVENT_HELPER
667 .procname = "hotplug",
668 .data = &uevent_helper,
669 .maxlen = UEVENT_HELPER_PATH_LEN,
671 .proc_handler = proc_dostring,
674 #ifdef CONFIG_CHR_DEV_SG
676 .procname = "sg-big-buff",
677 .data = &sg_big_buff,
678 .maxlen = sizeof (int),
680 .proc_handler = proc_dointvec,
683 #ifdef CONFIG_BSD_PROCESS_ACCT
687 .maxlen = 3*sizeof(int),
689 .proc_handler = proc_dointvec,
692 #ifdef CONFIG_MAGIC_SYSRQ
695 .data = &__sysrq_enabled,
696 .maxlen = sizeof (int),
698 .proc_handler = sysrq_sysctl_handler,
701 #ifdef CONFIG_PROC_SYSCTL
703 .procname = "cad_pid",
705 .maxlen = sizeof (int),
707 .proc_handler = proc_do_cad_pid,
711 .procname = "threads-max",
712 .data = &max_threads,
713 .maxlen = sizeof(int),
715 .proc_handler = proc_dointvec,
718 .procname = "random",
720 .child = random_table,
723 .procname = "usermodehelper",
725 .child = usermodehelper_table,
728 .procname = "overflowuid",
729 .data = &overflowuid,
730 .maxlen = sizeof(int),
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &minolduid,
734 .extra2 = &maxolduid,
737 .procname = "overflowgid",
738 .data = &overflowgid,
739 .maxlen = sizeof(int),
741 .proc_handler = proc_dointvec_minmax,
742 .extra1 = &minolduid,
743 .extra2 = &maxolduid,
746 #ifdef CONFIG_MATHEMU
748 .procname = "ieee_emulation_warnings",
749 .data = &sysctl_ieee_emulation_warnings,
750 .maxlen = sizeof(int),
752 .proc_handler = proc_dointvec,
756 .procname = "userprocess_debug",
757 .data = &show_unhandled_signals,
758 .maxlen = sizeof(int),
760 .proc_handler = proc_dointvec,
764 .procname = "pid_max",
766 .maxlen = sizeof (int),
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &pid_max_min,
770 .extra2 = &pid_max_max,
773 .procname = "panic_on_oops",
774 .data = &panic_on_oops,
775 .maxlen = sizeof(int),
777 .proc_handler = proc_dointvec,
779 #if defined CONFIG_PRINTK
781 .procname = "printk",
782 .data = &console_loglevel,
783 .maxlen = 4*sizeof(int),
785 .proc_handler = proc_dointvec,
788 .procname = "printk_ratelimit",
789 .data = &printk_ratelimit_state.interval,
790 .maxlen = sizeof(int),
792 .proc_handler = proc_dointvec_jiffies,
795 .procname = "printk_ratelimit_burst",
796 .data = &printk_ratelimit_state.burst,
797 .maxlen = sizeof(int),
799 .proc_handler = proc_dointvec,
802 .procname = "printk_delay",
803 .data = &printk_delay_msec,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec_minmax,
808 .extra2 = &ten_thousand,
811 .procname = "dmesg_restrict",
812 .data = &dmesg_restrict,
813 .maxlen = sizeof(int),
815 .proc_handler = proc_dointvec_minmax_sysadmin,
820 .procname = "kptr_restrict",
821 .data = &kptr_restrict,
822 .maxlen = sizeof(int),
824 .proc_handler = proc_dointvec_minmax_sysadmin,
830 .procname = "ngroups_max",
831 .data = &ngroups_max,
832 .maxlen = sizeof (int),
834 .proc_handler = proc_dointvec,
837 .procname = "cap_last_cap",
838 .data = (void *)&cap_last_cap,
839 .maxlen = sizeof(int),
841 .proc_handler = proc_dointvec,
843 #if defined(CONFIG_LOCKUP_DETECTOR)
845 .procname = "watchdog",
846 .data = &watchdog_user_enabled,
847 .maxlen = sizeof (int),
849 .proc_handler = proc_dowatchdog,
854 .procname = "watchdog_thresh",
855 .data = &watchdog_thresh,
856 .maxlen = sizeof(int),
858 .proc_handler = proc_dowatchdog,
863 .procname = "softlockup_panic",
864 .data = &softlockup_panic,
865 .maxlen = sizeof(int),
867 .proc_handler = proc_dointvec_minmax,
873 .procname = "softlockup_all_cpu_backtrace",
874 .data = &sysctl_softlockup_all_cpu_backtrace,
875 .maxlen = sizeof(int),
877 .proc_handler = proc_dointvec_minmax,
881 #endif /* CONFIG_SMP */
883 .procname = "nmi_watchdog",
884 .data = &watchdog_user_enabled,
885 .maxlen = sizeof (int),
887 .proc_handler = proc_dowatchdog,
892 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
894 .procname = "unknown_nmi_panic",
895 .data = &unknown_nmi_panic,
896 .maxlen = sizeof (int),
898 .proc_handler = proc_dointvec,
901 #if defined(CONFIG_X86)
903 .procname = "panic_on_unrecovered_nmi",
904 .data = &panic_on_unrecovered_nmi,
905 .maxlen = sizeof(int),
907 .proc_handler = proc_dointvec,
910 .procname = "panic_on_io_nmi",
911 .data = &panic_on_io_nmi,
912 .maxlen = sizeof(int),
914 .proc_handler = proc_dointvec,
916 #ifdef CONFIG_DEBUG_STACKOVERFLOW
918 .procname = "panic_on_stackoverflow",
919 .data = &sysctl_panic_on_stackoverflow,
920 .maxlen = sizeof(int),
922 .proc_handler = proc_dointvec,
926 .procname = "bootloader_type",
927 .data = &bootloader_type,
928 .maxlen = sizeof (int),
930 .proc_handler = proc_dointvec,
933 .procname = "bootloader_version",
934 .data = &bootloader_version,
935 .maxlen = sizeof (int),
937 .proc_handler = proc_dointvec,
940 .procname = "kstack_depth_to_print",
941 .data = &kstack_depth_to_print,
942 .maxlen = sizeof(int),
944 .proc_handler = proc_dointvec,
947 .procname = "io_delay_type",
948 .data = &io_delay_type,
949 .maxlen = sizeof(int),
951 .proc_handler = proc_dointvec,
954 #if defined(CONFIG_MMU)
956 .procname = "randomize_va_space",
957 .data = &randomize_va_space,
958 .maxlen = sizeof(int),
960 .proc_handler = proc_dointvec,
963 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
965 .procname = "spin_retry",
967 .maxlen = sizeof (int),
969 .proc_handler = proc_dointvec,
972 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
974 .procname = "acpi_video_flags",
975 .data = &acpi_realmode_flags,
976 .maxlen = sizeof (unsigned long),
978 .proc_handler = proc_doulongvec_minmax,
981 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
983 .procname = "ignore-unaligned-usertrap",
984 .data = &no_unaligned_warning,
985 .maxlen = sizeof (int),
987 .proc_handler = proc_dointvec,
992 .procname = "unaligned-dump-stack",
993 .data = &unaligned_dump_stack,
994 .maxlen = sizeof (int),
996 .proc_handler = proc_dointvec,
999 #ifdef CONFIG_DETECT_HUNG_TASK
1001 .procname = "hung_task_panic",
1002 .data = &sysctl_hung_task_panic,
1003 .maxlen = sizeof(int),
1005 .proc_handler = proc_dointvec_minmax,
1010 .procname = "hung_task_check_count",
1011 .data = &sysctl_hung_task_check_count,
1012 .maxlen = sizeof(int),
1014 .proc_handler = proc_dointvec_minmax,
1018 .procname = "hung_task_timeout_secs",
1019 .data = &sysctl_hung_task_timeout_secs,
1020 .maxlen = sizeof(unsigned long),
1022 .proc_handler = proc_dohung_task_timeout_secs,
1023 .extra2 = &hung_task_timeout_max,
1026 .procname = "hung_task_warnings",
1027 .data = &sysctl_hung_task_warnings,
1028 .maxlen = sizeof(int),
1030 .proc_handler = proc_dointvec_minmax,
1034 #ifdef CONFIG_COMPAT
1036 .procname = "compat-log",
1037 .data = &compat_log,
1038 .maxlen = sizeof (int),
1040 .proc_handler = proc_dointvec,
1043 #ifdef CONFIG_RT_MUTEXES
1045 .procname = "max_lock_depth",
1046 .data = &max_lock_depth,
1047 .maxlen = sizeof(int),
1049 .proc_handler = proc_dointvec,
1053 .procname = "poweroff_cmd",
1054 .data = &poweroff_cmd,
1055 .maxlen = POWEROFF_CMD_PATH_LEN,
1057 .proc_handler = proc_dostring,
1063 .child = key_sysctls,
1066 #ifdef CONFIG_PERF_EVENTS
1068 * User-space scripts rely on the existence of this file
1069 * as a feature check for perf_events being enabled.
1071 * So it's an ABI, do not remove!
1074 .procname = "perf_event_paranoid",
1075 .data = &sysctl_perf_event_paranoid,
1076 .maxlen = sizeof(sysctl_perf_event_paranoid),
1078 .proc_handler = proc_dointvec,
1081 .procname = "perf_event_mlock_kb",
1082 .data = &sysctl_perf_event_mlock,
1083 .maxlen = sizeof(sysctl_perf_event_mlock),
1085 .proc_handler = proc_dointvec,
1088 .procname = "perf_event_max_sample_rate",
1089 .data = &sysctl_perf_event_sample_rate,
1090 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1092 .proc_handler = perf_proc_update_handler,
1096 .procname = "perf_cpu_time_max_percent",
1097 .data = &sysctl_perf_cpu_time_max_percent,
1098 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1100 .proc_handler = perf_cpu_time_max_percent_handler,
1102 .extra2 = &one_hundred,
1105 #ifdef CONFIG_KMEMCHECK
1107 .procname = "kmemcheck",
1108 .data = &kmemcheck_enabled,
1109 .maxlen = sizeof(int),
1111 .proc_handler = proc_dointvec,
1115 .procname = "panic_on_warn",
1116 .data = &panic_on_warn,
1117 .maxlen = sizeof(int),
1119 .proc_handler = proc_dointvec_minmax,
1126 static struct ctl_table vm_table[] = {
1128 .procname = "overcommit_memory",
1129 .data = &sysctl_overcommit_memory,
1130 .maxlen = sizeof(sysctl_overcommit_memory),
1132 .proc_handler = proc_dointvec_minmax,
1137 .procname = "panic_on_oom",
1138 .data = &sysctl_panic_on_oom,
1139 .maxlen = sizeof(sysctl_panic_on_oom),
1141 .proc_handler = proc_dointvec_minmax,
1146 .procname = "oom_kill_allocating_task",
1147 .data = &sysctl_oom_kill_allocating_task,
1148 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1150 .proc_handler = proc_dointvec,
1153 .procname = "oom_dump_tasks",
1154 .data = &sysctl_oom_dump_tasks,
1155 .maxlen = sizeof(sysctl_oom_dump_tasks),
1157 .proc_handler = proc_dointvec,
1160 .procname = "overcommit_ratio",
1161 .data = &sysctl_overcommit_ratio,
1162 .maxlen = sizeof(sysctl_overcommit_ratio),
1164 .proc_handler = overcommit_ratio_handler,
1167 .procname = "overcommit_kbytes",
1168 .data = &sysctl_overcommit_kbytes,
1169 .maxlen = sizeof(sysctl_overcommit_kbytes),
1171 .proc_handler = overcommit_kbytes_handler,
1174 .procname = "page-cluster",
1175 .data = &page_cluster,
1176 .maxlen = sizeof(int),
1178 .proc_handler = proc_dointvec_minmax,
1182 .procname = "dirty_background_ratio",
1183 .data = &dirty_background_ratio,
1184 .maxlen = sizeof(dirty_background_ratio),
1186 .proc_handler = dirty_background_ratio_handler,
1188 .extra2 = &one_hundred,
1191 .procname = "dirty_background_bytes",
1192 .data = &dirty_background_bytes,
1193 .maxlen = sizeof(dirty_background_bytes),
1195 .proc_handler = dirty_background_bytes_handler,
1199 .procname = "dirty_ratio",
1200 .data = &vm_dirty_ratio,
1201 .maxlen = sizeof(vm_dirty_ratio),
1203 .proc_handler = dirty_ratio_handler,
1205 .extra2 = &one_hundred,
1208 .procname = "dirty_bytes",
1209 .data = &vm_dirty_bytes,
1210 .maxlen = sizeof(vm_dirty_bytes),
1212 .proc_handler = dirty_bytes_handler,
1213 .extra1 = &dirty_bytes_min,
1216 .procname = "dirty_writeback_centisecs",
1217 .data = &dirty_writeback_interval,
1218 .maxlen = sizeof(dirty_writeback_interval),
1220 .proc_handler = dirty_writeback_centisecs_handler,
1223 .procname = "dirty_expire_centisecs",
1224 .data = &dirty_expire_interval,
1225 .maxlen = sizeof(dirty_expire_interval),
1227 .proc_handler = proc_dointvec_minmax,
1231 .procname = "dirtytime_expire_seconds",
1232 .data = &dirtytime_expire_interval,
1233 .maxlen = sizeof(dirty_expire_interval),
1235 .proc_handler = dirtytime_interval_handler,
1239 .procname = "nr_pdflush_threads",
1240 .mode = 0444 /* read-only */,
1241 .proc_handler = pdflush_proc_obsolete,
1244 .procname = "swappiness",
1245 .data = &vm_swappiness,
1246 .maxlen = sizeof(vm_swappiness),
1248 .proc_handler = proc_dointvec_minmax,
1250 .extra2 = &one_hundred,
1252 #ifdef CONFIG_HUGETLB_PAGE
1254 .procname = "nr_hugepages",
1256 .maxlen = sizeof(unsigned long),
1258 .proc_handler = hugetlb_sysctl_handler,
1262 .procname = "nr_hugepages_mempolicy",
1264 .maxlen = sizeof(unsigned long),
1266 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1270 .procname = "hugetlb_shm_group",
1271 .data = &sysctl_hugetlb_shm_group,
1272 .maxlen = sizeof(gid_t),
1274 .proc_handler = proc_dointvec,
1277 .procname = "hugepages_treat_as_movable",
1278 .data = &hugepages_treat_as_movable,
1279 .maxlen = sizeof(int),
1281 .proc_handler = proc_dointvec,
1284 .procname = "nr_overcommit_hugepages",
1286 .maxlen = sizeof(unsigned long),
1288 .proc_handler = hugetlb_overcommit_handler,
1292 .procname = "lowmem_reserve_ratio",
1293 .data = &sysctl_lowmem_reserve_ratio,
1294 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1296 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1299 .procname = "drop_caches",
1300 .data = &sysctl_drop_caches,
1301 .maxlen = sizeof(int),
1303 .proc_handler = drop_caches_sysctl_handler,
1307 #ifdef CONFIG_COMPACTION
1309 .procname = "compact_memory",
1310 .data = &sysctl_compact_memory,
1311 .maxlen = sizeof(int),
1313 .proc_handler = sysctl_compaction_handler,
1316 .procname = "extfrag_threshold",
1317 .data = &sysctl_extfrag_threshold,
1318 .maxlen = sizeof(int),
1320 .proc_handler = sysctl_extfrag_handler,
1321 .extra1 = &min_extfrag_threshold,
1322 .extra2 = &max_extfrag_threshold,
1325 #endif /* CONFIG_COMPACTION */
1327 .procname = "min_free_kbytes",
1328 .data = &min_free_kbytes,
1329 .maxlen = sizeof(min_free_kbytes),
1331 .proc_handler = min_free_kbytes_sysctl_handler,
1335 .procname = "percpu_pagelist_fraction",
1336 .data = &percpu_pagelist_fraction,
1337 .maxlen = sizeof(percpu_pagelist_fraction),
1339 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1344 .procname = "max_map_count",
1345 .data = &sysctl_max_map_count,
1346 .maxlen = sizeof(sysctl_max_map_count),
1348 .proc_handler = proc_dointvec_minmax,
1353 .procname = "nr_trim_pages",
1354 .data = &sysctl_nr_trim_pages,
1355 .maxlen = sizeof(sysctl_nr_trim_pages),
1357 .proc_handler = proc_dointvec_minmax,
1362 .procname = "laptop_mode",
1363 .data = &laptop_mode,
1364 .maxlen = sizeof(laptop_mode),
1366 .proc_handler = proc_dointvec_jiffies,
1369 .procname = "block_dump",
1370 .data = &block_dump,
1371 .maxlen = sizeof(block_dump),
1373 .proc_handler = proc_dointvec,
1377 .procname = "vfs_cache_pressure",
1378 .data = &sysctl_vfs_cache_pressure,
1379 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1381 .proc_handler = proc_dointvec,
1384 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1386 .procname = "legacy_va_layout",
1387 .data = &sysctl_legacy_va_layout,
1388 .maxlen = sizeof(sysctl_legacy_va_layout),
1390 .proc_handler = proc_dointvec,
1396 .procname = "zone_reclaim_mode",
1397 .data = &zone_reclaim_mode,
1398 .maxlen = sizeof(zone_reclaim_mode),
1400 .proc_handler = proc_dointvec,
1404 .procname = "min_unmapped_ratio",
1405 .data = &sysctl_min_unmapped_ratio,
1406 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1408 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1410 .extra2 = &one_hundred,
1413 .procname = "min_slab_ratio",
1414 .data = &sysctl_min_slab_ratio,
1415 .maxlen = sizeof(sysctl_min_slab_ratio),
1417 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1419 .extra2 = &one_hundred,
1424 .procname = "stat_interval",
1425 .data = &sysctl_stat_interval,
1426 .maxlen = sizeof(sysctl_stat_interval),
1428 .proc_handler = proc_dointvec_jiffies,
1433 .procname = "mmap_min_addr",
1434 .data = &dac_mmap_min_addr,
1435 .maxlen = sizeof(unsigned long),
1437 .proc_handler = mmap_min_addr_handler,
1442 .procname = "numa_zonelist_order",
1443 .data = &numa_zonelist_order,
1444 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1446 .proc_handler = numa_zonelist_order_handler,
1449 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1450 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1452 .procname = "vdso_enabled",
1453 #ifdef CONFIG_X86_32
1454 .data = &vdso32_enabled,
1455 .maxlen = sizeof(vdso32_enabled),
1457 .data = &vdso_enabled,
1458 .maxlen = sizeof(vdso_enabled),
1461 .proc_handler = proc_dointvec,
1465 #ifdef CONFIG_HIGHMEM
1467 .procname = "highmem_is_dirtyable",
1468 .data = &vm_highmem_is_dirtyable,
1469 .maxlen = sizeof(vm_highmem_is_dirtyable),
1471 .proc_handler = proc_dointvec_minmax,
1476 #ifdef CONFIG_MEMORY_FAILURE
1478 .procname = "memory_failure_early_kill",
1479 .data = &sysctl_memory_failure_early_kill,
1480 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1482 .proc_handler = proc_dointvec_minmax,
1487 .procname = "memory_failure_recovery",
1488 .data = &sysctl_memory_failure_recovery,
1489 .maxlen = sizeof(sysctl_memory_failure_recovery),
1491 .proc_handler = proc_dointvec_minmax,
1497 .procname = "user_reserve_kbytes",
1498 .data = &sysctl_user_reserve_kbytes,
1499 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1501 .proc_handler = proc_doulongvec_minmax,
1504 .procname = "admin_reserve_kbytes",
1505 .data = &sysctl_admin_reserve_kbytes,
1506 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1508 .proc_handler = proc_doulongvec_minmax,
1513 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1514 static struct ctl_table binfmt_misc_table[] = {
1519 static struct ctl_table fs_table[] = {
1521 .procname = "inode-nr",
1522 .data = &inodes_stat,
1523 .maxlen = 2*sizeof(long),
1525 .proc_handler = proc_nr_inodes,
1528 .procname = "inode-state",
1529 .data = &inodes_stat,
1530 .maxlen = 7*sizeof(long),
1532 .proc_handler = proc_nr_inodes,
1535 .procname = "file-nr",
1536 .data = &files_stat,
1537 .maxlen = sizeof(files_stat),
1539 .proc_handler = proc_nr_files,
1542 .procname = "file-max",
1543 .data = &files_stat.max_files,
1544 .maxlen = sizeof(files_stat.max_files),
1546 .proc_handler = proc_doulongvec_minmax,
1549 .procname = "nr_open",
1550 .data = &sysctl_nr_open,
1551 .maxlen = sizeof(int),
1553 .proc_handler = proc_dointvec_minmax,
1554 .extra1 = &sysctl_nr_open_min,
1555 .extra2 = &sysctl_nr_open_max,
1558 .procname = "dentry-state",
1559 .data = &dentry_stat,
1560 .maxlen = 6*sizeof(long),
1562 .proc_handler = proc_nr_dentry,
1565 .procname = "overflowuid",
1566 .data = &fs_overflowuid,
1567 .maxlen = sizeof(int),
1569 .proc_handler = proc_dointvec_minmax,
1570 .extra1 = &minolduid,
1571 .extra2 = &maxolduid,
1574 .procname = "overflowgid",
1575 .data = &fs_overflowgid,
1576 .maxlen = sizeof(int),
1578 .proc_handler = proc_dointvec_minmax,
1579 .extra1 = &minolduid,
1580 .extra2 = &maxolduid,
1582 #ifdef CONFIG_FILE_LOCKING
1584 .procname = "leases-enable",
1585 .data = &leases_enable,
1586 .maxlen = sizeof(int),
1588 .proc_handler = proc_dointvec,
1591 #ifdef CONFIG_DNOTIFY
1593 .procname = "dir-notify-enable",
1594 .data = &dir_notify_enable,
1595 .maxlen = sizeof(int),
1597 .proc_handler = proc_dointvec,
1601 #ifdef CONFIG_FILE_LOCKING
1603 .procname = "lease-break-time",
1604 .data = &lease_break_time,
1605 .maxlen = sizeof(int),
1607 .proc_handler = proc_dointvec,
1612 .procname = "aio-nr",
1614 .maxlen = sizeof(aio_nr),
1616 .proc_handler = proc_doulongvec_minmax,
1619 .procname = "aio-max-nr",
1620 .data = &aio_max_nr,
1621 .maxlen = sizeof(aio_max_nr),
1623 .proc_handler = proc_doulongvec_minmax,
1625 #endif /* CONFIG_AIO */
1626 #ifdef CONFIG_INOTIFY_USER
1628 .procname = "inotify",
1630 .child = inotify_table,
1635 .procname = "epoll",
1637 .child = epoll_table,
1642 .procname = "protected_symlinks",
1643 .data = &sysctl_protected_symlinks,
1644 .maxlen = sizeof(int),
1646 .proc_handler = proc_dointvec_minmax,
1651 .procname = "protected_hardlinks",
1652 .data = &sysctl_protected_hardlinks,
1653 .maxlen = sizeof(int),
1655 .proc_handler = proc_dointvec_minmax,
1660 .procname = "suid_dumpable",
1661 .data = &suid_dumpable,
1662 .maxlen = sizeof(int),
1664 .proc_handler = proc_dointvec_minmax_coredump,
1668 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1670 .procname = "binfmt_misc",
1672 .child = binfmt_misc_table,
1676 .procname = "pipe-max-size",
1677 .data = &pipe_max_size,
1678 .maxlen = sizeof(int),
1680 .proc_handler = &pipe_proc_fn,
1681 .extra1 = &pipe_min_size,
1686 static struct ctl_table debug_table[] = {
1687 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1689 .procname = "exception-trace",
1690 .data = &show_unhandled_signals,
1691 .maxlen = sizeof(int),
1693 .proc_handler = proc_dointvec
1696 #if defined(CONFIG_OPTPROBES)
1698 .procname = "kprobes-optimization",
1699 .data = &sysctl_kprobes_optimization,
1700 .maxlen = sizeof(int),
1702 .proc_handler = proc_kprobes_optimization_handler,
1710 static struct ctl_table dev_table[] = {
1714 int __init sysctl_init(void)
1716 struct ctl_table_header *hdr;
1718 hdr = register_sysctl_table(sysctl_base_table);
1719 kmemleak_not_leak(hdr);
1723 #endif /* CONFIG_SYSCTL */
1729 #ifdef CONFIG_PROC_SYSCTL
1731 static int _proc_do_string(char *data, int maxlen, int write,
1732 char __user *buffer,
1733 size_t *lenp, loff_t *ppos)
1739 if (!data || !maxlen || !*lenp) {
1745 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1746 /* Only continue writes not past the end of buffer. */
1748 if (len > maxlen - 1)
1755 /* Start writing from beginning of buffer. */
1761 while ((p - buffer) < *lenp && len < maxlen - 1) {
1762 if (get_user(c, p++))
1764 if (c == 0 || c == '\n')
1785 if (copy_to_user(buffer, data, len))
1788 if (put_user('\n', buffer + len))
1798 static void warn_sysctl_write(struct ctl_table *table)
1800 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1801 "This will not be supported in the future. To silence this\n"
1802 "warning, set kernel.sysctl_writes_strict = -1\n",
1803 current->comm, table->procname);
1807 * proc_dostring - read a string sysctl
1808 * @table: the sysctl table
1809 * @write: %TRUE if this is a write to the sysctl file
1810 * @buffer: the user buffer
1811 * @lenp: the size of the user buffer
1812 * @ppos: file position
1814 * Reads/writes a string from/to the user buffer. If the kernel
1815 * buffer provided is not large enough to hold the string, the
1816 * string is truncated. The copied string is %NULL-terminated.
1817 * If the string is being read by the user process, it is copied
1818 * and a newline '\n' is added. It is truncated if the buffer is
1821 * Returns 0 on success.
1823 int proc_dostring(struct ctl_table *table, int write,
1824 void __user *buffer, size_t *lenp, loff_t *ppos)
1826 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1827 warn_sysctl_write(table);
1829 return _proc_do_string((char *)(table->data), table->maxlen, write,
1830 (char __user *)buffer, lenp, ppos);
1833 static size_t proc_skip_spaces(char **buf)
1836 char *tmp = skip_spaces(*buf);
1842 static void proc_skip_char(char **buf, size_t *size, const char v)
1852 #define TMPBUFLEN 22
1854 * proc_get_long - reads an ASCII formatted integer from a user buffer
1856 * @buf: a kernel buffer
1857 * @size: size of the kernel buffer
1858 * @val: this is where the number will be stored
1859 * @neg: set to %TRUE if number is negative
1860 * @perm_tr: a vector which contains the allowed trailers
1861 * @perm_tr_len: size of the perm_tr vector
1862 * @tr: pointer to store the trailer character
1864 * In case of success %0 is returned and @buf and @size are updated with
1865 * the amount of bytes read. If @tr is non-NULL and a trailing
1866 * character exists (size is non-zero after returning from this
1867 * function), @tr is updated with the trailing character.
1869 static int proc_get_long(char **buf, size_t *size,
1870 unsigned long *val, bool *neg,
1871 const char *perm_tr, unsigned perm_tr_len, char *tr)
1874 char *p, tmp[TMPBUFLEN];
1880 if (len > TMPBUFLEN - 1)
1881 len = TMPBUFLEN - 1;
1883 memcpy(tmp, *buf, len);
1887 if (*p == '-' && *size > 1) {
1895 *val = simple_strtoul(p, &p, 0);
1899 /* We don't know if the next char is whitespace thus we may accept
1900 * invalid integers (e.g. 1234...a) or two integers instead of one
1901 * (e.g. 123...1). So lets not allow such large numbers. */
1902 if (len == TMPBUFLEN - 1)
1905 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1908 if (tr && (len < *size))
1918 * proc_put_long - converts an integer to a decimal ASCII formatted string
1920 * @buf: the user buffer
1921 * @size: the size of the user buffer
1922 * @val: the integer to be converted
1923 * @neg: sign of the number, %TRUE for negative
1925 * In case of success %0 is returned and @buf and @size are updated with
1926 * the amount of bytes written.
1928 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1932 char tmp[TMPBUFLEN], *p = tmp;
1934 sprintf(p, "%s%lu", neg ? "-" : "", val);
1938 if (copy_to_user(*buf, tmp, len))
1946 static int proc_put_char(void __user **buf, size_t *size, char c)
1949 char __user **buffer = (char __user **)buf;
1950 if (put_user(c, *buffer))
1952 (*size)--, (*buffer)++;
1958 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1960 int write, void *data)
1963 *valp = *negp ? -*lvalp : *lvalp;
1968 *lvalp = (unsigned long)-val;
1971 *lvalp = (unsigned long)val;
1977 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1979 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1980 int write, void __user *buffer,
1981 size_t *lenp, loff_t *ppos,
1982 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1983 int write, void *data),
1986 int *i, vleft, first = 1, err = 0;
1987 unsigned long page = 0;
1991 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1996 i = (int *) tbl_data;
1997 vleft = table->maxlen / sizeof(*i);
2001 conv = do_proc_dointvec_conv;
2005 switch (sysctl_writes_strict) {
2006 case SYSCTL_WRITES_STRICT:
2008 case SYSCTL_WRITES_WARN:
2009 warn_sysctl_write(table);
2016 if (left > PAGE_SIZE - 1)
2017 left = PAGE_SIZE - 1;
2018 page = __get_free_page(GFP_TEMPORARY);
2019 kbuf = (char *) page;
2022 if (copy_from_user(kbuf, buffer, left)) {
2029 for (; left && vleft--; i++, first=0) {
2034 left -= proc_skip_spaces(&kbuf);
2038 err = proc_get_long(&kbuf, &left, &lval, &neg,
2040 sizeof(proc_wspace_sep), NULL);
2043 if (conv(&neg, &lval, i, 1, data)) {
2048 if (conv(&neg, &lval, i, 0, data)) {
2053 err = proc_put_char(&buffer, &left, '\t');
2056 err = proc_put_long(&buffer, &left, lval, neg);
2062 if (!write && !first && left && !err)
2063 err = proc_put_char(&buffer, &left, '\n');
2064 if (write && !err && left)
2065 left -= proc_skip_spaces(&kbuf);
2070 return err ? : -EINVAL;
2078 static int do_proc_dointvec(struct ctl_table *table, int write,
2079 void __user *buffer, size_t *lenp, loff_t *ppos,
2080 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2081 int write, void *data),
2084 return __do_proc_dointvec(table->data, table, write,
2085 buffer, lenp, ppos, conv, data);
2089 * proc_dointvec - read a vector of integers
2090 * @table: the sysctl table
2091 * @write: %TRUE if this is a write to the sysctl file
2092 * @buffer: the user buffer
2093 * @lenp: the size of the user buffer
2094 * @ppos: file position
2096 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2097 * values from/to the user buffer, treated as an ASCII string.
2099 * Returns 0 on success.
2101 int proc_dointvec(struct ctl_table *table, int write,
2102 void __user *buffer, size_t *lenp, loff_t *ppos)
2104 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2109 * Taint values can only be increased
2110 * This means we can safely use a temporary.
2112 static int proc_taint(struct ctl_table *table, int write,
2113 void __user *buffer, size_t *lenp, loff_t *ppos)
2116 unsigned long tmptaint = get_taint();
2119 if (write && !capable(CAP_SYS_ADMIN))
2124 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2130 * Poor man's atomic or. Not worth adding a primitive
2131 * to everyone's atomic.h for this
2134 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2135 if ((tmptaint >> i) & 1)
2136 add_taint(i, LOCKDEP_STILL_OK);
2143 #ifdef CONFIG_PRINTK
2144 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2145 void __user *buffer, size_t *lenp, loff_t *ppos)
2147 if (write && !capable(CAP_SYS_ADMIN))
2150 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2154 struct do_proc_dointvec_minmax_conv_param {
2159 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2161 int write, void *data)
2163 struct do_proc_dointvec_minmax_conv_param *param = data;
2165 int val = *negp ? -*lvalp : *lvalp;
2166 if ((param->min && *param->min > val) ||
2167 (param->max && *param->max < val))
2174 *lvalp = (unsigned long)-val;
2177 *lvalp = (unsigned long)val;
2184 * proc_dointvec_minmax - read a vector of integers with min/max values
2185 * @table: the sysctl table
2186 * @write: %TRUE if this is a write to the sysctl file
2187 * @buffer: the user buffer
2188 * @lenp: the size of the user buffer
2189 * @ppos: file position
2191 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2192 * values from/to the user buffer, treated as an ASCII string.
2194 * This routine will ensure the values are within the range specified by
2195 * table->extra1 (min) and table->extra2 (max).
2197 * Returns 0 on success.
2199 int proc_dointvec_minmax(struct ctl_table *table, int write,
2200 void __user *buffer, size_t *lenp, loff_t *ppos)
2202 struct do_proc_dointvec_minmax_conv_param param = {
2203 .min = (int *) table->extra1,
2204 .max = (int *) table->extra2,
2206 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2207 do_proc_dointvec_minmax_conv, ¶m);
2210 static void validate_coredump_safety(void)
2212 #ifdef CONFIG_COREDUMP
2213 if (suid_dumpable == SUID_DUMP_ROOT &&
2214 core_pattern[0] != '/' && core_pattern[0] != '|') {
2215 printk(KERN_WARNING "Unsafe core_pattern used with "\
2216 "suid_dumpable=2. Pipe handler or fully qualified "\
2217 "core dump path required.\n");
2222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2223 void __user *buffer, size_t *lenp, loff_t *ppos)
2225 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2227 validate_coredump_safety();
2231 #ifdef CONFIG_COREDUMP
2232 static int proc_dostring_coredump(struct ctl_table *table, int write,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2235 int error = proc_dostring(table, write, buffer, lenp, ppos);
2237 validate_coredump_safety();
2242 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2243 void __user *buffer,
2244 size_t *lenp, loff_t *ppos,
2245 unsigned long convmul,
2246 unsigned long convdiv)
2248 unsigned long *i, *min, *max;
2249 int vleft, first = 1, err = 0;
2250 unsigned long page = 0;
2254 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2259 i = (unsigned long *) data;
2260 min = (unsigned long *) table->extra1;
2261 max = (unsigned long *) table->extra2;
2262 vleft = table->maxlen / sizeof(unsigned long);
2267 switch (sysctl_writes_strict) {
2268 case SYSCTL_WRITES_STRICT:
2270 case SYSCTL_WRITES_WARN:
2271 warn_sysctl_write(table);
2278 if (left > PAGE_SIZE - 1)
2279 left = PAGE_SIZE - 1;
2280 page = __get_free_page(GFP_TEMPORARY);
2281 kbuf = (char *) page;
2284 if (copy_from_user(kbuf, buffer, left)) {
2291 for (; left && vleft--; i++, first = 0) {
2297 left -= proc_skip_spaces(&kbuf);
2299 err = proc_get_long(&kbuf, &left, &val, &neg,
2301 sizeof(proc_wspace_sep), NULL);
2306 if ((min && val < *min) || (max && val > *max))
2310 val = convdiv * (*i) / convmul;
2312 err = proc_put_char(&buffer, &left, '\t');
2316 err = proc_put_long(&buffer, &left, val, false);
2322 if (!write && !first && left && !err)
2323 err = proc_put_char(&buffer, &left, '\n');
2325 left -= proc_skip_spaces(&kbuf);
2330 return err ? : -EINVAL;
2338 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2339 void __user *buffer,
2340 size_t *lenp, loff_t *ppos,
2341 unsigned long convmul,
2342 unsigned long convdiv)
2344 return __do_proc_doulongvec_minmax(table->data, table, write,
2345 buffer, lenp, ppos, convmul, convdiv);
2349 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2350 * @table: the sysctl table
2351 * @write: %TRUE if this is a write to the sysctl file
2352 * @buffer: the user buffer
2353 * @lenp: the size of the user buffer
2354 * @ppos: file position
2356 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2357 * values from/to the user buffer, treated as an ASCII string.
2359 * This routine will ensure the values are within the range specified by
2360 * table->extra1 (min) and table->extra2 (max).
2362 * Returns 0 on success.
2364 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2365 void __user *buffer, size_t *lenp, loff_t *ppos)
2367 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2371 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2372 * @table: the sysctl table
2373 * @write: %TRUE if this is a write to the sysctl file
2374 * @buffer: the user buffer
2375 * @lenp: the size of the user buffer
2376 * @ppos: file position
2378 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2379 * values from/to the user buffer, treated as an ASCII string. The values
2380 * are treated as milliseconds, and converted to jiffies when they are stored.
2382 * This routine will ensure the values are within the range specified by
2383 * table->extra1 (min) and table->extra2 (max).
2385 * Returns 0 on success.
2387 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2388 void __user *buffer,
2389 size_t *lenp, loff_t *ppos)
2391 return do_proc_doulongvec_minmax(table, write, buffer,
2392 lenp, ppos, HZ, 1000l);
2396 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2398 int write, void *data)
2401 if (*lvalp > LONG_MAX / HZ)
2403 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2409 lval = (unsigned long)-val;
2412 lval = (unsigned long)val;
2419 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2421 int write, void *data)
2424 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2426 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2432 lval = (unsigned long)-val;
2435 lval = (unsigned long)val;
2437 *lvalp = jiffies_to_clock_t(lval);
2442 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2444 int write, void *data)
2447 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2457 lval = (unsigned long)-val;
2460 lval = (unsigned long)val;
2462 *lvalp = jiffies_to_msecs(lval);
2468 * proc_dointvec_jiffies - read a vector of integers as seconds
2469 * @table: the sysctl table
2470 * @write: %TRUE if this is a write to the sysctl file
2471 * @buffer: the user buffer
2472 * @lenp: the size of the user buffer
2473 * @ppos: file position
2475 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2476 * values from/to the user buffer, treated as an ASCII string.
2477 * The values read are assumed to be in seconds, and are converted into
2480 * Returns 0 on success.
2482 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2483 void __user *buffer, size_t *lenp, loff_t *ppos)
2485 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2486 do_proc_dointvec_jiffies_conv,NULL);
2490 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2491 * @table: the sysctl table
2492 * @write: %TRUE if this is a write to the sysctl file
2493 * @buffer: the user buffer
2494 * @lenp: the size of the user buffer
2495 * @ppos: pointer to the file position
2497 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2498 * values from/to the user buffer, treated as an ASCII string.
2499 * The values read are assumed to be in 1/USER_HZ seconds, and
2500 * are converted into jiffies.
2502 * Returns 0 on success.
2504 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2507 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2508 do_proc_dointvec_userhz_jiffies_conv,NULL);
2512 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2513 * @table: the sysctl table
2514 * @write: %TRUE if this is a write to the sysctl file
2515 * @buffer: the user buffer
2516 * @lenp: the size of the user buffer
2517 * @ppos: file position
2518 * @ppos: the current position in the file
2520 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2521 * values from/to the user buffer, treated as an ASCII string.
2522 * The values read are assumed to be in 1/1000 seconds, and
2523 * are converted into jiffies.
2525 * Returns 0 on success.
2527 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos)
2530 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2531 do_proc_dointvec_ms_jiffies_conv, NULL);
2534 static int proc_do_cad_pid(struct ctl_table *table, int write,
2535 void __user *buffer, size_t *lenp, loff_t *ppos)
2537 struct pid *new_pid;
2541 tmp = pid_vnr(cad_pid);
2543 r = __do_proc_dointvec(&tmp, table, write, buffer,
2544 lenp, ppos, NULL, NULL);
2548 new_pid = find_get_pid(tmp);
2552 put_pid(xchg(&cad_pid, new_pid));
2557 * proc_do_large_bitmap - read/write from/to a large bitmap
2558 * @table: the sysctl table
2559 * @write: %TRUE if this is a write to the sysctl file
2560 * @buffer: the user buffer
2561 * @lenp: the size of the user buffer
2562 * @ppos: file position
2564 * The bitmap is stored at table->data and the bitmap length (in bits)
2567 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2568 * large bitmaps may be represented in a compact manner. Writing into
2569 * the file will clear the bitmap then update it with the given input.
2571 * Returns 0 on success.
2573 int proc_do_large_bitmap(struct ctl_table *table, int write,
2574 void __user *buffer, size_t *lenp, loff_t *ppos)
2578 size_t left = *lenp;
2579 unsigned long bitmap_len = table->maxlen;
2580 unsigned long *bitmap = *(unsigned long **) table->data;
2581 unsigned long *tmp_bitmap = NULL;
2582 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2584 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2590 unsigned long page = 0;
2593 if (left > PAGE_SIZE - 1)
2594 left = PAGE_SIZE - 1;
2596 page = __get_free_page(GFP_TEMPORARY);
2597 kbuf = (char *) page;
2600 if (copy_from_user(kbuf, buffer, left)) {
2606 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2612 proc_skip_char(&kbuf, &left, '\n');
2613 while (!err && left) {
2614 unsigned long val_a, val_b;
2617 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2621 if (val_a >= bitmap_len || neg) {
2633 err = proc_get_long(&kbuf, &left, &val_b,
2634 &neg, tr_b, sizeof(tr_b),
2638 if (val_b >= bitmap_len || neg ||
2649 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2651 proc_skip_char(&kbuf, &left, '\n');
2655 unsigned long bit_a, bit_b = 0;
2658 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2659 if (bit_a >= bitmap_len)
2661 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2665 err = proc_put_char(&buffer, &left, ',');
2669 err = proc_put_long(&buffer, &left, bit_a, false);
2672 if (bit_a != bit_b) {
2673 err = proc_put_char(&buffer, &left, '-');
2676 err = proc_put_long(&buffer, &left, bit_b, false);
2684 err = proc_put_char(&buffer, &left, '\n');
2690 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2692 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2704 #else /* CONFIG_PROC_SYSCTL */
2706 int proc_dostring(struct ctl_table *table, int write,
2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2712 int proc_dointvec(struct ctl_table *table, int write,
2713 void __user *buffer, size_t *lenp, loff_t *ppos)
2718 int proc_dointvec_minmax(struct ctl_table *table, int write,
2719 void __user *buffer, size_t *lenp, loff_t *ppos)
2724 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2725 void __user *buffer, size_t *lenp, loff_t *ppos)
2730 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2731 void __user *buffer, size_t *lenp, loff_t *ppos)
2736 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2737 void __user *buffer, size_t *lenp, loff_t *ppos)
2742 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2743 void __user *buffer, size_t *lenp, loff_t *ppos)
2748 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2749 void __user *buffer,
2750 size_t *lenp, loff_t *ppos)
2756 #endif /* CONFIG_PROC_SYSCTL */
2759 * No sense putting this after each symbol definition, twice,
2760 * exception granted :-)
2762 EXPORT_SYMBOL(proc_dointvec);
2763 EXPORT_SYMBOL(proc_dointvec_jiffies);
2764 EXPORT_SYMBOL(proc_dointvec_minmax);
2765 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2766 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2767 EXPORT_SYMBOL(proc_dostring);
2768 EXPORT_SYMBOL(proc_doulongvec_minmax);
2769 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);