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>
22 #include <linux/aio.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
69 #include <asm/uaccess.h>
70 #include <asm/processor.h>
74 #include <asm/stacktrace.h>
78 #include <asm/setup.h>
80 #ifdef CONFIG_BSD_PROCESS_ACCT
81 #include <linux/acct.h>
83 #ifdef CONFIG_RT_MUTEXES
84 #include <linux/rtmutex.h>
86 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
87 #include <linux/lockdep.h>
89 #ifdef CONFIG_CHR_DEV_SG
93 #ifdef CONFIG_LOCKUP_DETECTOR
94 #include <linux/nmi.h>
97 #if defined(CONFIG_SYSCTL)
99 /* External variables not in a header file. */
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,
353 #endif /* CONFIG_SMP */
354 #ifdef CONFIG_NUMA_BALANCING
356 .procname = "numa_balancing_scan_delay_ms",
357 .data = &sysctl_numa_balancing_scan_delay,
358 .maxlen = sizeof(unsigned int),
360 .proc_handler = proc_dointvec,
363 .procname = "numa_balancing_scan_period_min_ms",
364 .data = &sysctl_numa_balancing_scan_period_min,
365 .maxlen = sizeof(unsigned int),
367 .proc_handler = proc_dointvec,
370 .procname = "numa_balancing_scan_period_max_ms",
371 .data = &sysctl_numa_balancing_scan_period_max,
372 .maxlen = sizeof(unsigned int),
374 .proc_handler = proc_dointvec,
377 .procname = "numa_balancing_scan_size_mb",
378 .data = &sysctl_numa_balancing_scan_size,
379 .maxlen = sizeof(unsigned int),
381 .proc_handler = proc_dointvec_minmax,
385 .procname = "numa_balancing",
386 .data = NULL, /* filled in by handler */
387 .maxlen = sizeof(unsigned int),
389 .proc_handler = sysctl_numa_balancing,
393 #endif /* CONFIG_NUMA_BALANCING */
394 #endif /* CONFIG_SCHED_DEBUG */
396 .procname = "sched_rt_period_us",
397 .data = &sysctl_sched_rt_period,
398 .maxlen = sizeof(unsigned int),
400 .proc_handler = sched_rt_handler,
403 .procname = "sched_rt_runtime_us",
404 .data = &sysctl_sched_rt_runtime,
405 .maxlen = sizeof(int),
407 .proc_handler = sched_rt_handler,
410 .procname = "sched_rr_timeslice_ms",
411 .data = &sched_rr_timeslice,
412 .maxlen = sizeof(int),
414 .proc_handler = sched_rr_handler,
416 #ifdef CONFIG_SCHED_AUTOGROUP
418 .procname = "sched_autogroup_enabled",
419 .data = &sysctl_sched_autogroup_enabled,
420 .maxlen = sizeof(unsigned int),
422 .proc_handler = proc_dointvec_minmax,
427 #ifdef CONFIG_CFS_BANDWIDTH
429 .procname = "sched_cfs_bandwidth_slice_us",
430 .data = &sysctl_sched_cfs_bandwidth_slice,
431 .maxlen = sizeof(unsigned int),
433 .proc_handler = proc_dointvec_minmax,
437 #ifdef CONFIG_PROVE_LOCKING
439 .procname = "prove_locking",
440 .data = &prove_locking,
441 .maxlen = sizeof(int),
443 .proc_handler = proc_dointvec,
446 #ifdef CONFIG_LOCK_STAT
448 .procname = "lock_stat",
450 .maxlen = sizeof(int),
452 .proc_handler = proc_dointvec,
457 .data = &panic_timeout,
458 .maxlen = sizeof(int),
460 .proc_handler = proc_dointvec,
462 #ifdef CONFIG_COREDUMP
464 .procname = "core_uses_pid",
465 .data = &core_uses_pid,
466 .maxlen = sizeof(int),
468 .proc_handler = proc_dointvec,
471 .procname = "core_pattern",
472 .data = core_pattern,
473 .maxlen = CORENAME_MAX_SIZE,
475 .proc_handler = proc_dostring_coredump,
478 .procname = "core_pipe_limit",
479 .data = &core_pipe_limit,
480 .maxlen = sizeof(unsigned int),
482 .proc_handler = proc_dointvec,
485 #ifdef CONFIG_PROC_SYSCTL
487 .procname = "tainted",
488 .maxlen = sizeof(long),
490 .proc_handler = proc_taint,
493 .procname = "sysctl_writes_strict",
494 .data = &sysctl_writes_strict,
495 .maxlen = sizeof(int),
497 .proc_handler = proc_dointvec_minmax,
502 #ifdef CONFIG_LATENCYTOP
504 .procname = "latencytop",
505 .data = &latencytop_enabled,
506 .maxlen = sizeof(int),
508 .proc_handler = proc_dointvec,
511 #ifdef CONFIG_BLK_DEV_INITRD
513 .procname = "real-root-dev",
514 .data = &real_root_dev,
515 .maxlen = sizeof(int),
517 .proc_handler = proc_dointvec,
521 .procname = "print-fatal-signals",
522 .data = &print_fatal_signals,
523 .maxlen = sizeof(int),
525 .proc_handler = proc_dointvec,
529 .procname = "reboot-cmd",
530 .data = reboot_command,
533 .proc_handler = proc_dostring,
536 .procname = "stop-a",
537 .data = &stop_a_enabled,
538 .maxlen = sizeof (int),
540 .proc_handler = proc_dointvec,
543 .procname = "scons-poweroff",
544 .data = &scons_pwroff,
545 .maxlen = sizeof (int),
547 .proc_handler = proc_dointvec,
550 #ifdef CONFIG_SPARC64
552 .procname = "tsb-ratio",
553 .data = &sysctl_tsb_ratio,
554 .maxlen = sizeof (int),
556 .proc_handler = proc_dointvec,
561 .procname = "soft-power",
562 .data = &pwrsw_enabled,
563 .maxlen = sizeof (int),
565 .proc_handler = proc_dointvec,
568 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
570 .procname = "unaligned-trap",
571 .data = &unaligned_enabled,
572 .maxlen = sizeof (int),
574 .proc_handler = proc_dointvec,
578 .procname = "ctrl-alt-del",
580 .maxlen = sizeof(int),
582 .proc_handler = proc_dointvec,
584 #ifdef CONFIG_FUNCTION_TRACER
586 .procname = "ftrace_enabled",
587 .data = &ftrace_enabled,
588 .maxlen = sizeof(int),
590 .proc_handler = ftrace_enable_sysctl,
593 #ifdef CONFIG_STACK_TRACER
595 .procname = "stack_tracer_enabled",
596 .data = &stack_tracer_enabled,
597 .maxlen = sizeof(int),
599 .proc_handler = stack_trace_sysctl,
602 #ifdef CONFIG_TRACING
604 .procname = "ftrace_dump_on_oops",
605 .data = &ftrace_dump_on_oops,
606 .maxlen = sizeof(int),
608 .proc_handler = proc_dointvec,
611 .procname = "traceoff_on_warning",
612 .data = &__disable_trace_on_warning,
613 .maxlen = sizeof(__disable_trace_on_warning),
615 .proc_handler = proc_dointvec,
618 .procname = "tracepoint_printk",
619 .data = &tracepoint_printk,
620 .maxlen = sizeof(tracepoint_printk),
622 .proc_handler = proc_dointvec,
625 #ifdef CONFIG_KEXEC_CORE
627 .procname = "kexec_load_disabled",
628 .data = &kexec_load_disabled,
629 .maxlen = sizeof(int),
631 /* only handle a transition from default "0" to "1" */
632 .proc_handler = proc_dointvec_minmax,
637 #ifdef CONFIG_MODULES
639 .procname = "modprobe",
640 .data = &modprobe_path,
641 .maxlen = KMOD_PATH_LEN,
643 .proc_handler = proc_dostring,
646 .procname = "modules_disabled",
647 .data = &modules_disabled,
648 .maxlen = sizeof(int),
650 /* only handle a transition from default "0" to "1" */
651 .proc_handler = proc_dointvec_minmax,
656 #ifdef CONFIG_UEVENT_HELPER
658 .procname = "hotplug",
659 .data = &uevent_helper,
660 .maxlen = UEVENT_HELPER_PATH_LEN,
662 .proc_handler = proc_dostring,
665 #ifdef CONFIG_CHR_DEV_SG
667 .procname = "sg-big-buff",
668 .data = &sg_big_buff,
669 .maxlen = sizeof (int),
671 .proc_handler = proc_dointvec,
674 #ifdef CONFIG_BSD_PROCESS_ACCT
678 .maxlen = 3*sizeof(int),
680 .proc_handler = proc_dointvec,
683 #ifdef CONFIG_MAGIC_SYSRQ
686 .data = &__sysrq_enabled,
687 .maxlen = sizeof (int),
689 .proc_handler = sysrq_sysctl_handler,
692 #ifdef CONFIG_PROC_SYSCTL
694 .procname = "cad_pid",
696 .maxlen = sizeof (int),
698 .proc_handler = proc_do_cad_pid,
702 .procname = "threads-max",
704 .maxlen = sizeof(int),
706 .proc_handler = sysctl_max_threads,
709 .procname = "random",
711 .child = random_table,
714 .procname = "usermodehelper",
716 .child = usermodehelper_table,
719 .procname = "overflowuid",
720 .data = &overflowuid,
721 .maxlen = sizeof(int),
723 .proc_handler = proc_dointvec_minmax,
724 .extra1 = &minolduid,
725 .extra2 = &maxolduid,
728 .procname = "overflowgid",
729 .data = &overflowgid,
730 .maxlen = sizeof(int),
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &minolduid,
734 .extra2 = &maxolduid,
737 #ifdef CONFIG_MATHEMU
739 .procname = "ieee_emulation_warnings",
740 .data = &sysctl_ieee_emulation_warnings,
741 .maxlen = sizeof(int),
743 .proc_handler = proc_dointvec,
747 .procname = "userprocess_debug",
748 .data = &show_unhandled_signals,
749 .maxlen = sizeof(int),
751 .proc_handler = proc_dointvec,
755 .procname = "pid_max",
757 .maxlen = sizeof (int),
759 .proc_handler = proc_dointvec_minmax,
760 .extra1 = &pid_max_min,
761 .extra2 = &pid_max_max,
764 .procname = "panic_on_oops",
765 .data = &panic_on_oops,
766 .maxlen = sizeof(int),
768 .proc_handler = proc_dointvec,
770 #if defined CONFIG_PRINTK
772 .procname = "printk",
773 .data = &console_loglevel,
774 .maxlen = 4*sizeof(int),
776 .proc_handler = proc_dointvec,
779 .procname = "printk_ratelimit",
780 .data = &printk_ratelimit_state.interval,
781 .maxlen = sizeof(int),
783 .proc_handler = proc_dointvec_jiffies,
786 .procname = "printk_ratelimit_burst",
787 .data = &printk_ratelimit_state.burst,
788 .maxlen = sizeof(int),
790 .proc_handler = proc_dointvec,
793 .procname = "printk_delay",
794 .data = &printk_delay_msec,
795 .maxlen = sizeof(int),
797 .proc_handler = proc_dointvec_minmax,
799 .extra2 = &ten_thousand,
802 .procname = "dmesg_restrict",
803 .data = &dmesg_restrict,
804 .maxlen = sizeof(int),
806 .proc_handler = proc_dointvec_minmax_sysadmin,
811 .procname = "kptr_restrict",
812 .data = &kptr_restrict,
813 .maxlen = sizeof(int),
815 .proc_handler = proc_dointvec_minmax_sysadmin,
821 .procname = "ngroups_max",
822 .data = &ngroups_max,
823 .maxlen = sizeof (int),
825 .proc_handler = proc_dointvec,
828 .procname = "cap_last_cap",
829 .data = (void *)&cap_last_cap,
830 .maxlen = sizeof(int),
832 .proc_handler = proc_dointvec,
834 #if defined(CONFIG_LOCKUP_DETECTOR)
836 .procname = "watchdog",
837 .data = &watchdog_user_enabled,
838 .maxlen = sizeof (int),
840 .proc_handler = proc_watchdog,
845 .procname = "watchdog_thresh",
846 .data = &watchdog_thresh,
847 .maxlen = sizeof(int),
849 .proc_handler = proc_watchdog_thresh,
854 .procname = "nmi_watchdog",
855 .data = &nmi_watchdog_enabled,
856 .maxlen = sizeof (int),
858 .proc_handler = proc_nmi_watchdog,
860 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
867 .procname = "soft_watchdog",
868 .data = &soft_watchdog_enabled,
869 .maxlen = sizeof (int),
871 .proc_handler = proc_soft_watchdog,
876 .procname = "watchdog_cpumask",
877 .data = &watchdog_cpumask_bits,
880 .proc_handler = proc_watchdog_cpumask,
883 .procname = "softlockup_panic",
884 .data = &softlockup_panic,
885 .maxlen = sizeof(int),
887 .proc_handler = proc_dointvec_minmax,
891 #ifdef CONFIG_HARDLOCKUP_DETECTOR
893 .procname = "hardlockup_panic",
894 .data = &hardlockup_panic,
895 .maxlen = sizeof(int),
897 .proc_handler = proc_dointvec_minmax,
904 .procname = "softlockup_all_cpu_backtrace",
905 .data = &sysctl_softlockup_all_cpu_backtrace,
906 .maxlen = sizeof(int),
908 .proc_handler = proc_dointvec_minmax,
913 .procname = "hardlockup_all_cpu_backtrace",
914 .data = &sysctl_hardlockup_all_cpu_backtrace,
915 .maxlen = sizeof(int),
917 .proc_handler = proc_dointvec_minmax,
921 #endif /* CONFIG_SMP */
923 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
925 .procname = "unknown_nmi_panic",
926 .data = &unknown_nmi_panic,
927 .maxlen = sizeof (int),
929 .proc_handler = proc_dointvec,
932 #if defined(CONFIG_X86)
934 .procname = "panic_on_unrecovered_nmi",
935 .data = &panic_on_unrecovered_nmi,
936 .maxlen = sizeof(int),
938 .proc_handler = proc_dointvec,
941 .procname = "panic_on_io_nmi",
942 .data = &panic_on_io_nmi,
943 .maxlen = sizeof(int),
945 .proc_handler = proc_dointvec,
947 #ifdef CONFIG_DEBUG_STACKOVERFLOW
949 .procname = "panic_on_stackoverflow",
950 .data = &sysctl_panic_on_stackoverflow,
951 .maxlen = sizeof(int),
953 .proc_handler = proc_dointvec,
957 .procname = "bootloader_type",
958 .data = &bootloader_type,
959 .maxlen = sizeof (int),
961 .proc_handler = proc_dointvec,
964 .procname = "bootloader_version",
965 .data = &bootloader_version,
966 .maxlen = sizeof (int),
968 .proc_handler = proc_dointvec,
971 .procname = "kstack_depth_to_print",
972 .data = &kstack_depth_to_print,
973 .maxlen = sizeof(int),
975 .proc_handler = proc_dointvec,
978 .procname = "io_delay_type",
979 .data = &io_delay_type,
980 .maxlen = sizeof(int),
982 .proc_handler = proc_dointvec,
985 #if defined(CONFIG_MMU)
987 .procname = "randomize_va_space",
988 .data = &randomize_va_space,
989 .maxlen = sizeof(int),
991 .proc_handler = proc_dointvec,
994 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
996 .procname = "spin_retry",
998 .maxlen = sizeof (int),
1000 .proc_handler = proc_dointvec,
1003 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1005 .procname = "acpi_video_flags",
1006 .data = &acpi_realmode_flags,
1007 .maxlen = sizeof (unsigned long),
1009 .proc_handler = proc_doulongvec_minmax,
1012 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1014 .procname = "ignore-unaligned-usertrap",
1015 .data = &no_unaligned_warning,
1016 .maxlen = sizeof (int),
1018 .proc_handler = proc_dointvec,
1023 .procname = "unaligned-dump-stack",
1024 .data = &unaligned_dump_stack,
1025 .maxlen = sizeof (int),
1027 .proc_handler = proc_dointvec,
1030 #ifdef CONFIG_DETECT_HUNG_TASK
1032 .procname = "hung_task_panic",
1033 .data = &sysctl_hung_task_panic,
1034 .maxlen = sizeof(int),
1036 .proc_handler = proc_dointvec_minmax,
1041 .procname = "hung_task_check_count",
1042 .data = &sysctl_hung_task_check_count,
1043 .maxlen = sizeof(int),
1045 .proc_handler = proc_dointvec_minmax,
1049 .procname = "hung_task_timeout_secs",
1050 .data = &sysctl_hung_task_timeout_secs,
1051 .maxlen = sizeof(unsigned long),
1053 .proc_handler = proc_dohung_task_timeout_secs,
1054 .extra2 = &hung_task_timeout_max,
1057 .procname = "hung_task_warnings",
1058 .data = &sysctl_hung_task_warnings,
1059 .maxlen = sizeof(int),
1061 .proc_handler = proc_dointvec_minmax,
1065 #ifdef CONFIG_COMPAT
1067 .procname = "compat-log",
1068 .data = &compat_log,
1069 .maxlen = sizeof (int),
1071 .proc_handler = proc_dointvec,
1074 #ifdef CONFIG_RT_MUTEXES
1076 .procname = "max_lock_depth",
1077 .data = &max_lock_depth,
1078 .maxlen = sizeof(int),
1080 .proc_handler = proc_dointvec,
1084 .procname = "poweroff_cmd",
1085 .data = &poweroff_cmd,
1086 .maxlen = POWEROFF_CMD_PATH_LEN,
1088 .proc_handler = proc_dostring,
1094 .child = key_sysctls,
1097 #ifdef CONFIG_PERF_EVENTS
1099 * User-space scripts rely on the existence of this file
1100 * as a feature check for perf_events being enabled.
1102 * So it's an ABI, do not remove!
1105 .procname = "perf_event_paranoid",
1106 .data = &sysctl_perf_event_paranoid,
1107 .maxlen = sizeof(sysctl_perf_event_paranoid),
1109 .proc_handler = proc_dointvec,
1112 .procname = "perf_event_mlock_kb",
1113 .data = &sysctl_perf_event_mlock,
1114 .maxlen = sizeof(sysctl_perf_event_mlock),
1116 .proc_handler = proc_dointvec,
1119 .procname = "perf_event_max_sample_rate",
1120 .data = &sysctl_perf_event_sample_rate,
1121 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1123 .proc_handler = perf_proc_update_handler,
1127 .procname = "perf_cpu_time_max_percent",
1128 .data = &sysctl_perf_cpu_time_max_percent,
1129 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1131 .proc_handler = perf_cpu_time_max_percent_handler,
1133 .extra2 = &one_hundred,
1136 #ifdef CONFIG_KMEMCHECK
1138 .procname = "kmemcheck",
1139 .data = &kmemcheck_enabled,
1140 .maxlen = sizeof(int),
1142 .proc_handler = proc_dointvec,
1146 .procname = "panic_on_warn",
1147 .data = &panic_on_warn,
1148 .maxlen = sizeof(int),
1150 .proc_handler = proc_dointvec_minmax,
1154 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1156 .procname = "timer_migration",
1157 .data = &sysctl_timer_migration,
1158 .maxlen = sizeof(unsigned int),
1160 .proc_handler = timer_migration_handler,
1163 #ifdef CONFIG_BPF_SYSCALL
1165 .procname = "unprivileged_bpf_disabled",
1166 .data = &sysctl_unprivileged_bpf_disabled,
1167 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1169 /* only handle a transition from default "0" to "1" */
1170 .proc_handler = proc_dointvec_minmax,
1178 static struct ctl_table vm_table[] = {
1180 .procname = "overcommit_memory",
1181 .data = &sysctl_overcommit_memory,
1182 .maxlen = sizeof(sysctl_overcommit_memory),
1184 .proc_handler = proc_dointvec_minmax,
1189 .procname = "panic_on_oom",
1190 .data = &sysctl_panic_on_oom,
1191 .maxlen = sizeof(sysctl_panic_on_oom),
1193 .proc_handler = proc_dointvec_minmax,
1198 .procname = "oom_kill_allocating_task",
1199 .data = &sysctl_oom_kill_allocating_task,
1200 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1202 .proc_handler = proc_dointvec,
1205 .procname = "oom_dump_tasks",
1206 .data = &sysctl_oom_dump_tasks,
1207 .maxlen = sizeof(sysctl_oom_dump_tasks),
1209 .proc_handler = proc_dointvec,
1212 .procname = "overcommit_ratio",
1213 .data = &sysctl_overcommit_ratio,
1214 .maxlen = sizeof(sysctl_overcommit_ratio),
1216 .proc_handler = overcommit_ratio_handler,
1219 .procname = "overcommit_kbytes",
1220 .data = &sysctl_overcommit_kbytes,
1221 .maxlen = sizeof(sysctl_overcommit_kbytes),
1223 .proc_handler = overcommit_kbytes_handler,
1226 .procname = "page-cluster",
1227 .data = &page_cluster,
1228 .maxlen = sizeof(int),
1230 .proc_handler = proc_dointvec_minmax,
1234 .procname = "dirty_background_ratio",
1235 .data = &dirty_background_ratio,
1236 .maxlen = sizeof(dirty_background_ratio),
1238 .proc_handler = dirty_background_ratio_handler,
1240 .extra2 = &one_hundred,
1243 .procname = "dirty_background_bytes",
1244 .data = &dirty_background_bytes,
1245 .maxlen = sizeof(dirty_background_bytes),
1247 .proc_handler = dirty_background_bytes_handler,
1251 .procname = "dirty_ratio",
1252 .data = &vm_dirty_ratio,
1253 .maxlen = sizeof(vm_dirty_ratio),
1255 .proc_handler = dirty_ratio_handler,
1257 .extra2 = &one_hundred,
1260 .procname = "dirty_bytes",
1261 .data = &vm_dirty_bytes,
1262 .maxlen = sizeof(vm_dirty_bytes),
1264 .proc_handler = dirty_bytes_handler,
1265 .extra1 = &dirty_bytes_min,
1268 .procname = "dirty_writeback_centisecs",
1269 .data = &dirty_writeback_interval,
1270 .maxlen = sizeof(dirty_writeback_interval),
1272 .proc_handler = dirty_writeback_centisecs_handler,
1275 .procname = "dirty_expire_centisecs",
1276 .data = &dirty_expire_interval,
1277 .maxlen = sizeof(dirty_expire_interval),
1279 .proc_handler = proc_dointvec_minmax,
1283 .procname = "dirtytime_expire_seconds",
1284 .data = &dirtytime_expire_interval,
1285 .maxlen = sizeof(dirty_expire_interval),
1287 .proc_handler = dirtytime_interval_handler,
1291 .procname = "nr_pdflush_threads",
1292 .mode = 0444 /* read-only */,
1293 .proc_handler = pdflush_proc_obsolete,
1296 .procname = "swappiness",
1297 .data = &vm_swappiness,
1298 .maxlen = sizeof(vm_swappiness),
1300 .proc_handler = proc_dointvec_minmax,
1302 .extra2 = &one_hundred,
1304 #ifdef CONFIG_HUGETLB_PAGE
1306 .procname = "nr_hugepages",
1308 .maxlen = sizeof(unsigned long),
1310 .proc_handler = hugetlb_sysctl_handler,
1314 .procname = "nr_hugepages_mempolicy",
1316 .maxlen = sizeof(unsigned long),
1318 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1322 .procname = "hugetlb_shm_group",
1323 .data = &sysctl_hugetlb_shm_group,
1324 .maxlen = sizeof(gid_t),
1326 .proc_handler = proc_dointvec,
1329 .procname = "hugepages_treat_as_movable",
1330 .data = &hugepages_treat_as_movable,
1331 .maxlen = sizeof(int),
1333 .proc_handler = proc_dointvec,
1336 .procname = "nr_overcommit_hugepages",
1338 .maxlen = sizeof(unsigned long),
1340 .proc_handler = hugetlb_overcommit_handler,
1344 .procname = "lowmem_reserve_ratio",
1345 .data = &sysctl_lowmem_reserve_ratio,
1346 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1348 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1351 .procname = "drop_caches",
1352 .data = &sysctl_drop_caches,
1353 .maxlen = sizeof(int),
1355 .proc_handler = drop_caches_sysctl_handler,
1359 #ifdef CONFIG_COMPACTION
1361 .procname = "compact_memory",
1362 .data = &sysctl_compact_memory,
1363 .maxlen = sizeof(int),
1365 .proc_handler = sysctl_compaction_handler,
1368 .procname = "extfrag_threshold",
1369 .data = &sysctl_extfrag_threshold,
1370 .maxlen = sizeof(int),
1372 .proc_handler = sysctl_extfrag_handler,
1373 .extra1 = &min_extfrag_threshold,
1374 .extra2 = &max_extfrag_threshold,
1377 .procname = "compact_unevictable_allowed",
1378 .data = &sysctl_compact_unevictable_allowed,
1379 .maxlen = sizeof(int),
1381 .proc_handler = proc_dointvec,
1386 #endif /* CONFIG_COMPACTION */
1388 .procname = "min_free_kbytes",
1389 .data = &min_free_kbytes,
1390 .maxlen = sizeof(min_free_kbytes),
1392 .proc_handler = min_free_kbytes_sysctl_handler,
1396 .procname = "percpu_pagelist_fraction",
1397 .data = &percpu_pagelist_fraction,
1398 .maxlen = sizeof(percpu_pagelist_fraction),
1400 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1405 .procname = "max_map_count",
1406 .data = &sysctl_max_map_count,
1407 .maxlen = sizeof(sysctl_max_map_count),
1409 .proc_handler = proc_dointvec_minmax,
1414 .procname = "nr_trim_pages",
1415 .data = &sysctl_nr_trim_pages,
1416 .maxlen = sizeof(sysctl_nr_trim_pages),
1418 .proc_handler = proc_dointvec_minmax,
1423 .procname = "laptop_mode",
1424 .data = &laptop_mode,
1425 .maxlen = sizeof(laptop_mode),
1427 .proc_handler = proc_dointvec_jiffies,
1430 .procname = "block_dump",
1431 .data = &block_dump,
1432 .maxlen = sizeof(block_dump),
1434 .proc_handler = proc_dointvec,
1438 .procname = "vfs_cache_pressure",
1439 .data = &sysctl_vfs_cache_pressure,
1440 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1442 .proc_handler = proc_dointvec,
1445 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1447 .procname = "legacy_va_layout",
1448 .data = &sysctl_legacy_va_layout,
1449 .maxlen = sizeof(sysctl_legacy_va_layout),
1451 .proc_handler = proc_dointvec,
1457 .procname = "zone_reclaim_mode",
1458 .data = &zone_reclaim_mode,
1459 .maxlen = sizeof(zone_reclaim_mode),
1461 .proc_handler = proc_dointvec,
1465 .procname = "min_unmapped_ratio",
1466 .data = &sysctl_min_unmapped_ratio,
1467 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1469 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1471 .extra2 = &one_hundred,
1474 .procname = "min_slab_ratio",
1475 .data = &sysctl_min_slab_ratio,
1476 .maxlen = sizeof(sysctl_min_slab_ratio),
1478 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1480 .extra2 = &one_hundred,
1485 .procname = "stat_interval",
1486 .data = &sysctl_stat_interval,
1487 .maxlen = sizeof(sysctl_stat_interval),
1489 .proc_handler = proc_dointvec_jiffies,
1494 .procname = "mmap_min_addr",
1495 .data = &dac_mmap_min_addr,
1496 .maxlen = sizeof(unsigned long),
1498 .proc_handler = mmap_min_addr_handler,
1503 .procname = "numa_zonelist_order",
1504 .data = &numa_zonelist_order,
1505 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1507 .proc_handler = numa_zonelist_order_handler,
1510 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1511 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1513 .procname = "vdso_enabled",
1514 #ifdef CONFIG_X86_32
1515 .data = &vdso32_enabled,
1516 .maxlen = sizeof(vdso32_enabled),
1518 .data = &vdso_enabled,
1519 .maxlen = sizeof(vdso_enabled),
1522 .proc_handler = proc_dointvec,
1526 #ifdef CONFIG_HIGHMEM
1528 .procname = "highmem_is_dirtyable",
1529 .data = &vm_highmem_is_dirtyable,
1530 .maxlen = sizeof(vm_highmem_is_dirtyable),
1532 .proc_handler = proc_dointvec_minmax,
1537 #ifdef CONFIG_MEMORY_FAILURE
1539 .procname = "memory_failure_early_kill",
1540 .data = &sysctl_memory_failure_early_kill,
1541 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1543 .proc_handler = proc_dointvec_minmax,
1548 .procname = "memory_failure_recovery",
1549 .data = &sysctl_memory_failure_recovery,
1550 .maxlen = sizeof(sysctl_memory_failure_recovery),
1552 .proc_handler = proc_dointvec_minmax,
1558 .procname = "user_reserve_kbytes",
1559 .data = &sysctl_user_reserve_kbytes,
1560 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1562 .proc_handler = proc_doulongvec_minmax,
1565 .procname = "admin_reserve_kbytes",
1566 .data = &sysctl_admin_reserve_kbytes,
1567 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1569 .proc_handler = proc_doulongvec_minmax,
1574 static struct ctl_table fs_table[] = {
1576 .procname = "inode-nr",
1577 .data = &inodes_stat,
1578 .maxlen = 2*sizeof(long),
1580 .proc_handler = proc_nr_inodes,
1583 .procname = "inode-state",
1584 .data = &inodes_stat,
1585 .maxlen = 7*sizeof(long),
1587 .proc_handler = proc_nr_inodes,
1590 .procname = "file-nr",
1591 .data = &files_stat,
1592 .maxlen = sizeof(files_stat),
1594 .proc_handler = proc_nr_files,
1597 .procname = "file-max",
1598 .data = &files_stat.max_files,
1599 .maxlen = sizeof(files_stat.max_files),
1601 .proc_handler = proc_doulongvec_minmax,
1604 .procname = "nr_open",
1605 .data = &sysctl_nr_open,
1606 .maxlen = sizeof(int),
1608 .proc_handler = proc_dointvec_minmax,
1609 .extra1 = &sysctl_nr_open_min,
1610 .extra2 = &sysctl_nr_open_max,
1613 .procname = "dentry-state",
1614 .data = &dentry_stat,
1615 .maxlen = 6*sizeof(long),
1617 .proc_handler = proc_nr_dentry,
1620 .procname = "overflowuid",
1621 .data = &fs_overflowuid,
1622 .maxlen = sizeof(int),
1624 .proc_handler = proc_dointvec_minmax,
1625 .extra1 = &minolduid,
1626 .extra2 = &maxolduid,
1629 .procname = "overflowgid",
1630 .data = &fs_overflowgid,
1631 .maxlen = sizeof(int),
1633 .proc_handler = proc_dointvec_minmax,
1634 .extra1 = &minolduid,
1635 .extra2 = &maxolduid,
1637 #ifdef CONFIG_FILE_LOCKING
1639 .procname = "leases-enable",
1640 .data = &leases_enable,
1641 .maxlen = sizeof(int),
1643 .proc_handler = proc_dointvec,
1646 #ifdef CONFIG_DNOTIFY
1648 .procname = "dir-notify-enable",
1649 .data = &dir_notify_enable,
1650 .maxlen = sizeof(int),
1652 .proc_handler = proc_dointvec,
1656 #ifdef CONFIG_FILE_LOCKING
1658 .procname = "lease-break-time",
1659 .data = &lease_break_time,
1660 .maxlen = sizeof(int),
1662 .proc_handler = proc_dointvec,
1667 .procname = "aio-nr",
1669 .maxlen = sizeof(aio_nr),
1671 .proc_handler = proc_doulongvec_minmax,
1674 .procname = "aio-max-nr",
1675 .data = &aio_max_nr,
1676 .maxlen = sizeof(aio_max_nr),
1678 .proc_handler = proc_doulongvec_minmax,
1680 #endif /* CONFIG_AIO */
1681 #ifdef CONFIG_INOTIFY_USER
1683 .procname = "inotify",
1685 .child = inotify_table,
1690 .procname = "epoll",
1692 .child = epoll_table,
1697 .procname = "protected_symlinks",
1698 .data = &sysctl_protected_symlinks,
1699 .maxlen = sizeof(int),
1701 .proc_handler = proc_dointvec_minmax,
1706 .procname = "protected_hardlinks",
1707 .data = &sysctl_protected_hardlinks,
1708 .maxlen = sizeof(int),
1710 .proc_handler = proc_dointvec_minmax,
1715 .procname = "suid_dumpable",
1716 .data = &suid_dumpable,
1717 .maxlen = sizeof(int),
1719 .proc_handler = proc_dointvec_minmax_coredump,
1723 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1725 .procname = "binfmt_misc",
1727 .child = sysctl_mount_point,
1731 .procname = "pipe-max-size",
1732 .data = &pipe_max_size,
1733 .maxlen = sizeof(int),
1735 .proc_handler = &pipe_proc_fn,
1736 .extra1 = &pipe_min_size,
1739 .procname = "pipe-user-pages-hard",
1740 .data = &pipe_user_pages_hard,
1741 .maxlen = sizeof(pipe_user_pages_hard),
1743 .proc_handler = proc_doulongvec_minmax,
1746 .procname = "pipe-user-pages-soft",
1747 .data = &pipe_user_pages_soft,
1748 .maxlen = sizeof(pipe_user_pages_soft),
1750 .proc_handler = proc_doulongvec_minmax,
1755 static struct ctl_table debug_table[] = {
1756 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1758 .procname = "exception-trace",
1759 .data = &show_unhandled_signals,
1760 .maxlen = sizeof(int),
1762 .proc_handler = proc_dointvec
1765 #if defined(CONFIG_OPTPROBES)
1767 .procname = "kprobes-optimization",
1768 .data = &sysctl_kprobes_optimization,
1769 .maxlen = sizeof(int),
1771 .proc_handler = proc_kprobes_optimization_handler,
1779 static struct ctl_table dev_table[] = {
1783 int __init sysctl_init(void)
1785 struct ctl_table_header *hdr;
1787 hdr = register_sysctl_table(sysctl_base_table);
1788 kmemleak_not_leak(hdr);
1792 #endif /* CONFIG_SYSCTL */
1798 #ifdef CONFIG_PROC_SYSCTL
1800 static int _proc_do_string(char *data, int maxlen, int write,
1801 char __user *buffer,
1802 size_t *lenp, loff_t *ppos)
1808 if (!data || !maxlen || !*lenp) {
1814 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1815 /* Only continue writes not past the end of buffer. */
1817 if (len > maxlen - 1)
1824 /* Start writing from beginning of buffer. */
1830 while ((p - buffer) < *lenp && len < maxlen - 1) {
1831 if (get_user(c, p++))
1833 if (c == 0 || c == '\n')
1854 if (copy_to_user(buffer, data, len))
1857 if (put_user('\n', buffer + len))
1867 static void warn_sysctl_write(struct ctl_table *table)
1869 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1870 "This will not be supported in the future. To silence this\n"
1871 "warning, set kernel.sysctl_writes_strict = -1\n",
1872 current->comm, table->procname);
1876 * proc_dostring - read a string sysctl
1877 * @table: the sysctl table
1878 * @write: %TRUE if this is a write to the sysctl file
1879 * @buffer: the user buffer
1880 * @lenp: the size of the user buffer
1881 * @ppos: file position
1883 * Reads/writes a string from/to the user buffer. If the kernel
1884 * buffer provided is not large enough to hold the string, the
1885 * string is truncated. The copied string is %NULL-terminated.
1886 * If the string is being read by the user process, it is copied
1887 * and a newline '\n' is added. It is truncated if the buffer is
1890 * Returns 0 on success.
1892 int proc_dostring(struct ctl_table *table, int write,
1893 void __user *buffer, size_t *lenp, loff_t *ppos)
1895 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1896 warn_sysctl_write(table);
1898 return _proc_do_string((char *)(table->data), table->maxlen, write,
1899 (char __user *)buffer, lenp, ppos);
1902 static size_t proc_skip_spaces(char **buf)
1905 char *tmp = skip_spaces(*buf);
1911 static void proc_skip_char(char **buf, size_t *size, const char v)
1921 #define TMPBUFLEN 22
1923 * proc_get_long - reads an ASCII formatted integer from a user buffer
1925 * @buf: a kernel buffer
1926 * @size: size of the kernel buffer
1927 * @val: this is where the number will be stored
1928 * @neg: set to %TRUE if number is negative
1929 * @perm_tr: a vector which contains the allowed trailers
1930 * @perm_tr_len: size of the perm_tr vector
1931 * @tr: pointer to store the trailer character
1933 * In case of success %0 is returned and @buf and @size are updated with
1934 * the amount of bytes read. If @tr is non-NULL and a trailing
1935 * character exists (size is non-zero after returning from this
1936 * function), @tr is updated with the trailing character.
1938 static int proc_get_long(char **buf, size_t *size,
1939 unsigned long *val, bool *neg,
1940 const char *perm_tr, unsigned perm_tr_len, char *tr)
1943 char *p, tmp[TMPBUFLEN];
1949 if (len > TMPBUFLEN - 1)
1950 len = TMPBUFLEN - 1;
1952 memcpy(tmp, *buf, len);
1956 if (*p == '-' && *size > 1) {
1964 *val = simple_strtoul(p, &p, 0);
1968 /* We don't know if the next char is whitespace thus we may accept
1969 * invalid integers (e.g. 1234...a) or two integers instead of one
1970 * (e.g. 123...1). So lets not allow such large numbers. */
1971 if (len == TMPBUFLEN - 1)
1974 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1977 if (tr && (len < *size))
1987 * proc_put_long - converts an integer to a decimal ASCII formatted string
1989 * @buf: the user buffer
1990 * @size: the size of the user buffer
1991 * @val: the integer to be converted
1992 * @neg: sign of the number, %TRUE for negative
1994 * In case of success %0 is returned and @buf and @size are updated with
1995 * the amount of bytes written.
1997 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2001 char tmp[TMPBUFLEN], *p = tmp;
2003 sprintf(p, "%s%lu", neg ? "-" : "", val);
2007 if (copy_to_user(*buf, tmp, len))
2015 static int proc_put_char(void __user **buf, size_t *size, char c)
2018 char __user **buffer = (char __user **)buf;
2019 if (put_user(c, *buffer))
2021 (*size)--, (*buffer)++;
2027 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2029 int write, void *data)
2033 if (*lvalp > (unsigned long) INT_MAX + 1)
2037 if (*lvalp > (unsigned long) INT_MAX)
2045 *lvalp = -(unsigned long)val;
2048 *lvalp = (unsigned long)val;
2054 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2056 int write, void *data)
2063 unsigned int val = *valp;
2064 *lvalp = (unsigned long)val;
2069 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2071 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2072 int write, void __user *buffer,
2073 size_t *lenp, loff_t *ppos,
2074 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2075 int write, void *data),
2078 int *i, vleft, first = 1, err = 0;
2079 unsigned long page = 0;
2083 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2088 i = (int *) tbl_data;
2089 vleft = table->maxlen / sizeof(*i);
2093 conv = do_proc_dointvec_conv;
2097 switch (sysctl_writes_strict) {
2098 case SYSCTL_WRITES_STRICT:
2100 case SYSCTL_WRITES_WARN:
2101 warn_sysctl_write(table);
2108 if (left > PAGE_SIZE - 1)
2109 left = PAGE_SIZE - 1;
2110 page = __get_free_page(GFP_TEMPORARY);
2111 kbuf = (char *) page;
2114 if (copy_from_user(kbuf, buffer, left)) {
2121 for (; left && vleft--; i++, first=0) {
2126 left -= proc_skip_spaces(&kbuf);
2130 err = proc_get_long(&kbuf, &left, &lval, &neg,
2132 sizeof(proc_wspace_sep), NULL);
2135 if (conv(&neg, &lval, i, 1, data)) {
2140 if (conv(&neg, &lval, i, 0, data)) {
2145 err = proc_put_char(&buffer, &left, '\t');
2148 err = proc_put_long(&buffer, &left, lval, neg);
2154 if (!write && !first && left && !err)
2155 err = proc_put_char(&buffer, &left, '\n');
2156 if (write && !err && left)
2157 left -= proc_skip_spaces(&kbuf);
2162 return err ? : -EINVAL;
2170 static int do_proc_dointvec(struct ctl_table *table, int write,
2171 void __user *buffer, size_t *lenp, loff_t *ppos,
2172 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2173 int write, void *data),
2176 return __do_proc_dointvec(table->data, table, write,
2177 buffer, lenp, ppos, conv, data);
2181 * proc_dointvec - read a vector of integers
2182 * @table: the sysctl table
2183 * @write: %TRUE if this is a write to the sysctl file
2184 * @buffer: the user buffer
2185 * @lenp: the size of the user buffer
2186 * @ppos: file position
2188 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2189 * values from/to the user buffer, treated as an ASCII string.
2191 * Returns 0 on success.
2193 int proc_dointvec(struct ctl_table *table, int write,
2194 void __user *buffer, size_t *lenp, loff_t *ppos)
2196 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2200 * proc_douintvec - read a vector of unsigned integers
2201 * @table: the sysctl table
2202 * @write: %TRUE if this is a write to the sysctl file
2203 * @buffer: the user buffer
2204 * @lenp: the size of the user buffer
2205 * @ppos: file position
2207 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2208 * values from/to the user buffer, treated as an ASCII string.
2210 * Returns 0 on success.
2212 int proc_douintvec(struct ctl_table *table, int write,
2213 void __user *buffer, size_t *lenp, loff_t *ppos)
2215 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2216 do_proc_douintvec_conv, NULL);
2220 * Taint values can only be increased
2221 * This means we can safely use a temporary.
2223 static int proc_taint(struct ctl_table *table, int write,
2224 void __user *buffer, size_t *lenp, loff_t *ppos)
2227 unsigned long tmptaint = get_taint();
2230 if (write && !capable(CAP_SYS_ADMIN))
2235 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2241 * Poor man's atomic or. Not worth adding a primitive
2242 * to everyone's atomic.h for this
2245 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2246 if ((tmptaint >> i) & 1)
2247 add_taint(i, LOCKDEP_STILL_OK);
2254 #ifdef CONFIG_PRINTK
2255 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2256 void __user *buffer, size_t *lenp, loff_t *ppos)
2258 if (write && !capable(CAP_SYS_ADMIN))
2261 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2265 struct do_proc_dointvec_minmax_conv_param {
2270 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2272 int write, void *data)
2274 struct do_proc_dointvec_minmax_conv_param *param = data;
2276 int val = *negp ? -*lvalp : *lvalp;
2277 if ((param->min && *param->min > val) ||
2278 (param->max && *param->max < val))
2285 *lvalp = -(unsigned long)val;
2288 *lvalp = (unsigned long)val;
2295 * proc_dointvec_minmax - read a vector of integers with min/max values
2296 * @table: the sysctl table
2297 * @write: %TRUE if this is a write to the sysctl file
2298 * @buffer: the user buffer
2299 * @lenp: the size of the user buffer
2300 * @ppos: file position
2302 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2303 * values from/to the user buffer, treated as an ASCII string.
2305 * This routine will ensure the values are within the range specified by
2306 * table->extra1 (min) and table->extra2 (max).
2308 * Returns 0 on success.
2310 int proc_dointvec_minmax(struct ctl_table *table, int write,
2311 void __user *buffer, size_t *lenp, loff_t *ppos)
2313 struct do_proc_dointvec_minmax_conv_param param = {
2314 .min = (int *) table->extra1,
2315 .max = (int *) table->extra2,
2317 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2318 do_proc_dointvec_minmax_conv, ¶m);
2321 static void validate_coredump_safety(void)
2323 #ifdef CONFIG_COREDUMP
2324 if (suid_dumpable == SUID_DUMP_ROOT &&
2325 core_pattern[0] != '/' && core_pattern[0] != '|') {
2326 printk(KERN_WARNING "Unsafe core_pattern used with "\
2327 "suid_dumpable=2. Pipe handler or fully qualified "\
2328 "core dump path required.\n");
2333 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2334 void __user *buffer, size_t *lenp, loff_t *ppos)
2336 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2338 validate_coredump_safety();
2342 #ifdef CONFIG_COREDUMP
2343 static int proc_dostring_coredump(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos)
2346 int error = proc_dostring(table, write, buffer, lenp, ppos);
2348 validate_coredump_safety();
2353 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2354 void __user *buffer,
2355 size_t *lenp, loff_t *ppos,
2356 unsigned long convmul,
2357 unsigned long convdiv)
2359 unsigned long *i, *min, *max;
2360 int vleft, first = 1, err = 0;
2361 unsigned long page = 0;
2365 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2370 i = (unsigned long *) data;
2371 min = (unsigned long *) table->extra1;
2372 max = (unsigned long *) table->extra2;
2373 vleft = table->maxlen / sizeof(unsigned long);
2378 switch (sysctl_writes_strict) {
2379 case SYSCTL_WRITES_STRICT:
2381 case SYSCTL_WRITES_WARN:
2382 warn_sysctl_write(table);
2389 if (left > PAGE_SIZE - 1)
2390 left = PAGE_SIZE - 1;
2391 page = __get_free_page(GFP_TEMPORARY);
2392 kbuf = (char *) page;
2395 if (copy_from_user(kbuf, buffer, left)) {
2402 for (; left && vleft--; i++, first = 0) {
2408 left -= proc_skip_spaces(&kbuf);
2410 err = proc_get_long(&kbuf, &left, &val, &neg,
2412 sizeof(proc_wspace_sep), NULL);
2417 if ((min && val < *min) || (max && val > *max))
2421 val = convdiv * (*i) / convmul;
2423 err = proc_put_char(&buffer, &left, '\t');
2427 err = proc_put_long(&buffer, &left, val, false);
2433 if (!write && !first && left && !err)
2434 err = proc_put_char(&buffer, &left, '\n');
2436 left -= proc_skip_spaces(&kbuf);
2441 return err ? : -EINVAL;
2449 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2450 void __user *buffer,
2451 size_t *lenp, loff_t *ppos,
2452 unsigned long convmul,
2453 unsigned long convdiv)
2455 return __do_proc_doulongvec_minmax(table->data, table, write,
2456 buffer, lenp, ppos, convmul, convdiv);
2460 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2461 * @table: the sysctl table
2462 * @write: %TRUE if this is a write to the sysctl file
2463 * @buffer: the user buffer
2464 * @lenp: the size of the user buffer
2465 * @ppos: file position
2467 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2468 * values from/to the user buffer, treated as an ASCII string.
2470 * This routine will ensure the values are within the range specified by
2471 * table->extra1 (min) and table->extra2 (max).
2473 * Returns 0 on success.
2475 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2476 void __user *buffer, size_t *lenp, loff_t *ppos)
2478 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2482 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2483 * @table: the sysctl table
2484 * @write: %TRUE if this is a write to the sysctl file
2485 * @buffer: the user buffer
2486 * @lenp: the size of the user buffer
2487 * @ppos: file position
2489 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2490 * values from/to the user buffer, treated as an ASCII string. The values
2491 * are treated as milliseconds, and converted to jiffies when they are stored.
2493 * This routine will ensure the values are within the range specified by
2494 * table->extra1 (min) and table->extra2 (max).
2496 * Returns 0 on success.
2498 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2499 void __user *buffer,
2500 size_t *lenp, loff_t *ppos)
2502 return do_proc_doulongvec_minmax(table, write, buffer,
2503 lenp, ppos, HZ, 1000l);
2507 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2509 int write, void *data)
2512 if (*lvalp > LONG_MAX / HZ)
2514 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2520 lval = -(unsigned long)val;
2523 lval = (unsigned long)val;
2530 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2532 int write, void *data)
2535 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2537 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2543 lval = -(unsigned long)val;
2546 lval = (unsigned long)val;
2548 *lvalp = jiffies_to_clock_t(lval);
2553 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2555 int write, void *data)
2558 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2568 lval = -(unsigned long)val;
2571 lval = (unsigned long)val;
2573 *lvalp = jiffies_to_msecs(lval);
2579 * proc_dointvec_jiffies - read a vector of integers as seconds
2580 * @table: the sysctl table
2581 * @write: %TRUE if this is a write to the sysctl file
2582 * @buffer: the user buffer
2583 * @lenp: the size of the user buffer
2584 * @ppos: file position
2586 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2587 * values from/to the user buffer, treated as an ASCII string.
2588 * The values read are assumed to be in seconds, and are converted into
2591 * Returns 0 on success.
2593 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2594 void __user *buffer, size_t *lenp, loff_t *ppos)
2596 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2597 do_proc_dointvec_jiffies_conv,NULL);
2601 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2602 * @table: the sysctl table
2603 * @write: %TRUE if this is a write to the sysctl file
2604 * @buffer: the user buffer
2605 * @lenp: the size of the user buffer
2606 * @ppos: pointer to the file position
2608 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2609 * values from/to the user buffer, treated as an ASCII string.
2610 * The values read are assumed to be in 1/USER_HZ seconds, and
2611 * are converted into jiffies.
2613 * Returns 0 on success.
2615 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2616 void __user *buffer, size_t *lenp, loff_t *ppos)
2618 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2619 do_proc_dointvec_userhz_jiffies_conv,NULL);
2623 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2624 * @table: the sysctl table
2625 * @write: %TRUE if this is a write to the sysctl file
2626 * @buffer: the user buffer
2627 * @lenp: the size of the user buffer
2628 * @ppos: file position
2629 * @ppos: the current position in the file
2631 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2632 * values from/to the user buffer, treated as an ASCII string.
2633 * The values read are assumed to be in 1/1000 seconds, and
2634 * are converted into jiffies.
2636 * Returns 0 on success.
2638 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2639 void __user *buffer, size_t *lenp, loff_t *ppos)
2641 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2642 do_proc_dointvec_ms_jiffies_conv, NULL);
2645 static int proc_do_cad_pid(struct ctl_table *table, int write,
2646 void __user *buffer, size_t *lenp, loff_t *ppos)
2648 struct pid *new_pid;
2652 tmp = pid_vnr(cad_pid);
2654 r = __do_proc_dointvec(&tmp, table, write, buffer,
2655 lenp, ppos, NULL, NULL);
2659 new_pid = find_get_pid(tmp);
2663 put_pid(xchg(&cad_pid, new_pid));
2668 * proc_do_large_bitmap - read/write from/to a large bitmap
2669 * @table: the sysctl table
2670 * @write: %TRUE if this is a write to the sysctl file
2671 * @buffer: the user buffer
2672 * @lenp: the size of the user buffer
2673 * @ppos: file position
2675 * The bitmap is stored at table->data and the bitmap length (in bits)
2678 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2679 * large bitmaps may be represented in a compact manner. Writing into
2680 * the file will clear the bitmap then update it with the given input.
2682 * Returns 0 on success.
2684 int proc_do_large_bitmap(struct ctl_table *table, int write,
2685 void __user *buffer, size_t *lenp, loff_t *ppos)
2689 size_t left = *lenp;
2690 unsigned long bitmap_len = table->maxlen;
2691 unsigned long *bitmap = *(unsigned long **) table->data;
2692 unsigned long *tmp_bitmap = NULL;
2693 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2695 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2701 unsigned long page = 0;
2704 if (left > PAGE_SIZE - 1)
2705 left = PAGE_SIZE - 1;
2707 page = __get_free_page(GFP_TEMPORARY);
2708 kbuf = (char *) page;
2711 if (copy_from_user(kbuf, buffer, left)) {
2717 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2723 proc_skip_char(&kbuf, &left, '\n');
2724 while (!err && left) {
2725 unsigned long val_a, val_b;
2728 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2732 if (val_a >= bitmap_len || neg) {
2744 err = proc_get_long(&kbuf, &left, &val_b,
2745 &neg, tr_b, sizeof(tr_b),
2749 if (val_b >= bitmap_len || neg ||
2760 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2762 proc_skip_char(&kbuf, &left, '\n');
2766 unsigned long bit_a, bit_b = 0;
2769 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2770 if (bit_a >= bitmap_len)
2772 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2776 err = proc_put_char(&buffer, &left, ',');
2780 err = proc_put_long(&buffer, &left, bit_a, false);
2783 if (bit_a != bit_b) {
2784 err = proc_put_char(&buffer, &left, '-');
2787 err = proc_put_long(&buffer, &left, bit_b, false);
2795 err = proc_put_char(&buffer, &left, '\n');
2801 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2803 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2815 #else /* CONFIG_PROC_SYSCTL */
2817 int proc_dostring(struct ctl_table *table, int write,
2818 void __user *buffer, size_t *lenp, loff_t *ppos)
2823 int proc_dointvec(struct ctl_table *table, int write,
2824 void __user *buffer, size_t *lenp, loff_t *ppos)
2829 int proc_douintvec(struct ctl_table *table, int write,
2830 void __user *buffer, size_t *lenp, loff_t *ppos)
2835 int proc_dointvec_minmax(struct ctl_table *table, int write,
2836 void __user *buffer, size_t *lenp, loff_t *ppos)
2841 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2842 void __user *buffer, size_t *lenp, loff_t *ppos)
2847 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2848 void __user *buffer, size_t *lenp, loff_t *ppos)
2853 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2854 void __user *buffer, size_t *lenp, loff_t *ppos)
2859 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2860 void __user *buffer, size_t *lenp, loff_t *ppos)
2865 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2866 void __user *buffer,
2867 size_t *lenp, loff_t *ppos)
2873 #endif /* CONFIG_PROC_SYSCTL */
2876 * No sense putting this after each symbol definition, twice,
2877 * exception granted :-)
2879 EXPORT_SYMBOL(proc_dointvec);
2880 EXPORT_SYMBOL(proc_douintvec);
2881 EXPORT_SYMBOL(proc_dointvec_jiffies);
2882 EXPORT_SYMBOL(proc_dointvec_minmax);
2883 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2884 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2885 EXPORT_SYMBOL(proc_dostring);
2886 EXPORT_SYMBOL(proc_doulongvec_minmax);
2887 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);