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/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/kmemcheck.h>
30 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/ratelimit.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_event.h>
55 #include <asm/uaccess.h>
56 #include <asm/processor.h>
60 #include <asm/stacktrace.h>
64 static int deprecated_sysctl_warning(struct __sysctl_args *args);
66 #if defined(CONFIG_SYSCTL)
68 /* External variables not in a header file. */
70 extern int print_fatal_signals;
71 extern int sysctl_overcommit_memory;
72 extern int sysctl_overcommit_ratio;
73 extern int sysctl_panic_on_oom;
74 extern int sysctl_oom_kill_allocating_task;
75 extern int sysctl_oom_dump_tasks;
76 extern int max_threads;
77 extern int core_uses_pid;
78 extern int suid_dumpable;
79 extern char core_pattern[];
80 extern unsigned int core_pipe_limit;
82 extern int min_free_kbytes;
83 extern int pid_max_min, pid_max_max;
84 extern int sysctl_drop_caches;
85 extern int percpu_pagelist_fraction;
86 extern int compat_log;
87 extern int latencytop_enabled;
88 extern int sysctl_nr_open_min, sysctl_nr_open_max;
90 extern int sysctl_nr_trim_pages;
92 #ifdef CONFIG_RCU_TORTURE_TEST
93 extern int rcutorture_runnable;
94 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
96 extern int blk_iopoll_enabled;
99 /* Constants used for minimum and maximum */
100 #ifdef CONFIG_DETECT_SOFTLOCKUP
101 static int sixty = 60;
102 static int neg_one = -1;
106 static int __maybe_unused one = 1;
107 static int __maybe_unused two = 2;
108 static unsigned long one_ul = 1;
109 static int one_hundred = 100;
111 static int ten_thousand = 10000;
114 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
115 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
117 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
118 static int maxolduid = 65535;
119 static int minolduid;
120 static int min_percpu_pagelist_fract = 8;
122 static int ngroups_max = NGROUPS_MAX;
124 #ifdef CONFIG_MODULES
125 extern char modprobe_path[];
126 extern int modules_disabled;
128 #ifdef CONFIG_CHR_DEV_SG
129 extern int sg_big_buff;
133 #include <asm/system.h>
136 #ifdef CONFIG_SPARC64
137 extern int sysctl_tsb_ratio;
141 extern int pwrsw_enabled;
142 extern int unaligned_enabled;
146 #ifdef CONFIG_MATHEMU
147 extern int sysctl_ieee_emulation_warnings;
149 extern int sysctl_userprocess_debug;
150 extern int spin_retry;
153 #ifdef CONFIG_BSD_PROCESS_ACCT
154 extern int acct_parm[];
158 extern int no_unaligned_warning;
159 extern int unaligned_dump_stack;
162 extern struct ratelimit_state printk_ratelimit_state;
164 #ifdef CONFIG_RT_MUTEXES
165 extern int max_lock_depth;
168 #ifdef CONFIG_PROC_SYSCTL
169 static int proc_do_cad_pid(struct ctl_table *table, int write,
170 void __user *buffer, size_t *lenp, loff_t *ppos);
171 static int proc_taint(struct ctl_table *table, int write,
172 void __user *buffer, size_t *lenp, loff_t *ppos);
175 static struct ctl_table root_table[];
176 static struct ctl_table_root sysctl_table_root;
177 static struct ctl_table_header root_table_header = {
179 .ctl_table = root_table,
180 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
181 .root = &sysctl_table_root,
182 .set = &sysctl_table_root.default_set,
184 static struct ctl_table_root sysctl_table_root = {
185 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
186 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
189 static struct ctl_table kern_table[];
190 static struct ctl_table vm_table[];
191 static struct ctl_table fs_table[];
192 static struct ctl_table debug_table[];
193 static struct ctl_table dev_table[];
194 extern struct ctl_table random_table[];
195 #ifdef CONFIG_INOTIFY_USER
196 extern struct ctl_table inotify_table[];
199 extern struct ctl_table epoll_table[];
202 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
203 int sysctl_legacy_va_layout;
206 extern int prove_locking;
207 extern int lock_stat;
209 /* The default sysctl tables: */
211 static struct ctl_table root_table[] = {
213 .ctl_name = CTL_KERN,
214 .procname = "kernel",
231 .ctl_name = CTL_DEBUG,
234 .child = debug_table,
243 * NOTE: do not add new entries to this table unless you have read
244 * Documentation/sysctl/ctl_unnumbered.txt
249 #ifdef CONFIG_SCHED_DEBUG
250 static int min_sched_granularity_ns = 100000; /* 100 usecs */
251 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
252 static int min_wakeup_granularity_ns; /* 0 usecs */
253 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
256 static struct ctl_table kern_table[] = {
258 .ctl_name = CTL_UNNUMBERED,
259 .procname = "sched_child_runs_first",
260 .data = &sysctl_sched_child_runs_first,
261 .maxlen = sizeof(unsigned int),
263 .proc_handler = &proc_dointvec,
265 #ifdef CONFIG_SCHED_DEBUG
267 .ctl_name = CTL_UNNUMBERED,
268 .procname = "sched_min_granularity_ns",
269 .data = &sysctl_sched_min_granularity,
270 .maxlen = sizeof(unsigned int),
272 .proc_handler = &sched_nr_latency_handler,
273 .strategy = &sysctl_intvec,
274 .extra1 = &min_sched_granularity_ns,
275 .extra2 = &max_sched_granularity_ns,
278 .ctl_name = CTL_UNNUMBERED,
279 .procname = "sched_latency_ns",
280 .data = &sysctl_sched_latency,
281 .maxlen = sizeof(unsigned int),
283 .proc_handler = &sched_nr_latency_handler,
284 .strategy = &sysctl_intvec,
285 .extra1 = &min_sched_granularity_ns,
286 .extra2 = &max_sched_granularity_ns,
289 .ctl_name = CTL_UNNUMBERED,
290 .procname = "sched_wakeup_granularity_ns",
291 .data = &sysctl_sched_wakeup_granularity,
292 .maxlen = sizeof(unsigned int),
294 .proc_handler = &proc_dointvec_minmax,
295 .strategy = &sysctl_intvec,
296 .extra1 = &min_wakeup_granularity_ns,
297 .extra2 = &max_wakeup_granularity_ns,
300 .ctl_name = CTL_UNNUMBERED,
301 .procname = "sched_shares_ratelimit",
302 .data = &sysctl_sched_shares_ratelimit,
303 .maxlen = sizeof(unsigned int),
305 .proc_handler = &proc_dointvec,
308 .ctl_name = CTL_UNNUMBERED,
309 .procname = "sched_shares_thresh",
310 .data = &sysctl_sched_shares_thresh,
311 .maxlen = sizeof(unsigned int),
313 .proc_handler = &proc_dointvec_minmax,
314 .strategy = &sysctl_intvec,
318 .ctl_name = CTL_UNNUMBERED,
319 .procname = "sched_migration_cost",
320 .data = &sysctl_sched_migration_cost,
321 .maxlen = sizeof(unsigned int),
323 .proc_handler = &proc_dointvec,
326 .ctl_name = CTL_UNNUMBERED,
327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
331 .proc_handler = &proc_dointvec,
334 .ctl_name = CTL_UNNUMBERED,
335 .procname = "sched_time_avg",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
339 .proc_handler = &proc_dointvec,
342 .ctl_name = CTL_UNNUMBERED,
343 .procname = "timer_migration",
344 .data = &sysctl_timer_migration,
345 .maxlen = sizeof(unsigned int),
347 .proc_handler = &proc_dointvec_minmax,
348 .strategy = &sysctl_intvec,
354 .ctl_name = CTL_UNNUMBERED,
355 .procname = "sched_rt_period_us",
356 .data = &sysctl_sched_rt_period,
357 .maxlen = sizeof(unsigned int),
359 .proc_handler = &sched_rt_handler,
362 .ctl_name = CTL_UNNUMBERED,
363 .procname = "sched_rt_runtime_us",
364 .data = &sysctl_sched_rt_runtime,
365 .maxlen = sizeof(int),
367 .proc_handler = &sched_rt_handler,
370 .ctl_name = CTL_UNNUMBERED,
371 .procname = "sched_compat_yield",
372 .data = &sysctl_sched_compat_yield,
373 .maxlen = sizeof(unsigned int),
375 .proc_handler = &proc_dointvec,
377 #ifdef CONFIG_PROVE_LOCKING
379 .ctl_name = CTL_UNNUMBERED,
380 .procname = "prove_locking",
381 .data = &prove_locking,
382 .maxlen = sizeof(int),
384 .proc_handler = &proc_dointvec,
387 #ifdef CONFIG_LOCK_STAT
389 .ctl_name = CTL_UNNUMBERED,
390 .procname = "lock_stat",
392 .maxlen = sizeof(int),
394 .proc_handler = &proc_dointvec,
398 .ctl_name = KERN_PANIC,
400 .data = &panic_timeout,
401 .maxlen = sizeof(int),
403 .proc_handler = &proc_dointvec,
406 .ctl_name = KERN_CORE_USES_PID,
407 .procname = "core_uses_pid",
408 .data = &core_uses_pid,
409 .maxlen = sizeof(int),
411 .proc_handler = &proc_dointvec,
414 .ctl_name = KERN_CORE_PATTERN,
415 .procname = "core_pattern",
416 .data = core_pattern,
417 .maxlen = CORENAME_MAX_SIZE,
419 .proc_handler = &proc_dostring,
420 .strategy = &sysctl_string,
423 .ctl_name = CTL_UNNUMBERED,
424 .procname = "core_pipe_limit",
425 .data = &core_pipe_limit,
426 .maxlen = sizeof(unsigned int),
428 .proc_handler = &proc_dointvec,
430 #ifdef CONFIG_PROC_SYSCTL
432 .procname = "tainted",
433 .maxlen = sizeof(long),
435 .proc_handler = &proc_taint,
438 #ifdef CONFIG_LATENCYTOP
440 .procname = "latencytop",
441 .data = &latencytop_enabled,
442 .maxlen = sizeof(int),
444 .proc_handler = &proc_dointvec,
447 #ifdef CONFIG_BLK_DEV_INITRD
449 .ctl_name = KERN_REALROOTDEV,
450 .procname = "real-root-dev",
451 .data = &real_root_dev,
452 .maxlen = sizeof(int),
454 .proc_handler = &proc_dointvec,
458 .ctl_name = CTL_UNNUMBERED,
459 .procname = "print-fatal-signals",
460 .data = &print_fatal_signals,
461 .maxlen = sizeof(int),
463 .proc_handler = &proc_dointvec,
467 .ctl_name = KERN_SPARC_REBOOT,
468 .procname = "reboot-cmd",
469 .data = reboot_command,
472 .proc_handler = &proc_dostring,
473 .strategy = &sysctl_string,
476 .ctl_name = KERN_SPARC_STOP_A,
477 .procname = "stop-a",
478 .data = &stop_a_enabled,
479 .maxlen = sizeof (int),
481 .proc_handler = &proc_dointvec,
484 .ctl_name = KERN_SPARC_SCONS_PWROFF,
485 .procname = "scons-poweroff",
486 .data = &scons_pwroff,
487 .maxlen = sizeof (int),
489 .proc_handler = &proc_dointvec,
492 #ifdef CONFIG_SPARC64
494 .ctl_name = CTL_UNNUMBERED,
495 .procname = "tsb-ratio",
496 .data = &sysctl_tsb_ratio,
497 .maxlen = sizeof (int),
499 .proc_handler = &proc_dointvec,
504 .ctl_name = KERN_HPPA_PWRSW,
505 .procname = "soft-power",
506 .data = &pwrsw_enabled,
507 .maxlen = sizeof (int),
509 .proc_handler = &proc_dointvec,
512 .ctl_name = KERN_HPPA_UNALIGNED,
513 .procname = "unaligned-trap",
514 .data = &unaligned_enabled,
515 .maxlen = sizeof (int),
517 .proc_handler = &proc_dointvec,
521 .ctl_name = KERN_CTLALTDEL,
522 .procname = "ctrl-alt-del",
524 .maxlen = sizeof(int),
526 .proc_handler = &proc_dointvec,
528 #ifdef CONFIG_FUNCTION_TRACER
530 .ctl_name = CTL_UNNUMBERED,
531 .procname = "ftrace_enabled",
532 .data = &ftrace_enabled,
533 .maxlen = sizeof(int),
535 .proc_handler = &ftrace_enable_sysctl,
538 #ifdef CONFIG_STACK_TRACER
540 .ctl_name = CTL_UNNUMBERED,
541 .procname = "stack_tracer_enabled",
542 .data = &stack_tracer_enabled,
543 .maxlen = sizeof(int),
545 .proc_handler = &stack_trace_sysctl,
548 #ifdef CONFIG_TRACING
550 .ctl_name = CTL_UNNUMBERED,
551 .procname = "ftrace_dump_on_oops",
552 .data = &ftrace_dump_on_oops,
553 .maxlen = sizeof(int),
555 .proc_handler = &proc_dointvec,
558 #ifdef CONFIG_MODULES
560 .ctl_name = KERN_MODPROBE,
561 .procname = "modprobe",
562 .data = &modprobe_path,
563 .maxlen = KMOD_PATH_LEN,
565 .proc_handler = &proc_dostring,
566 .strategy = &sysctl_string,
569 .ctl_name = CTL_UNNUMBERED,
570 .procname = "modules_disabled",
571 .data = &modules_disabled,
572 .maxlen = sizeof(int),
574 /* only handle a transition from default "0" to "1" */
575 .proc_handler = &proc_dointvec_minmax,
580 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
582 .ctl_name = KERN_HOTPLUG,
583 .procname = "hotplug",
584 .data = &uevent_helper,
585 .maxlen = UEVENT_HELPER_PATH_LEN,
587 .proc_handler = &proc_dostring,
588 .strategy = &sysctl_string,
591 #ifdef CONFIG_CHR_DEV_SG
593 .ctl_name = KERN_SG_BIG_BUFF,
594 .procname = "sg-big-buff",
595 .data = &sg_big_buff,
596 .maxlen = sizeof (int),
598 .proc_handler = &proc_dointvec,
601 #ifdef CONFIG_BSD_PROCESS_ACCT
603 .ctl_name = KERN_ACCT,
606 .maxlen = 3*sizeof(int),
608 .proc_handler = &proc_dointvec,
611 #ifdef CONFIG_MAGIC_SYSRQ
613 .ctl_name = KERN_SYSRQ,
615 .data = &__sysrq_enabled,
616 .maxlen = sizeof (int),
618 .proc_handler = &proc_dointvec,
621 #ifdef CONFIG_PROC_SYSCTL
623 .procname = "cad_pid",
625 .maxlen = sizeof (int),
627 .proc_handler = &proc_do_cad_pid,
631 .ctl_name = KERN_MAX_THREADS,
632 .procname = "threads-max",
633 .data = &max_threads,
634 .maxlen = sizeof(int),
636 .proc_handler = &proc_dointvec,
639 .ctl_name = KERN_RANDOM,
640 .procname = "random",
642 .child = random_table,
645 .ctl_name = KERN_OVERFLOWUID,
646 .procname = "overflowuid",
647 .data = &overflowuid,
648 .maxlen = sizeof(int),
650 .proc_handler = &proc_dointvec_minmax,
651 .strategy = &sysctl_intvec,
652 .extra1 = &minolduid,
653 .extra2 = &maxolduid,
656 .ctl_name = KERN_OVERFLOWGID,
657 .procname = "overflowgid",
658 .data = &overflowgid,
659 .maxlen = sizeof(int),
661 .proc_handler = &proc_dointvec_minmax,
662 .strategy = &sysctl_intvec,
663 .extra1 = &minolduid,
664 .extra2 = &maxolduid,
667 #ifdef CONFIG_MATHEMU
669 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
670 .procname = "ieee_emulation_warnings",
671 .data = &sysctl_ieee_emulation_warnings,
672 .maxlen = sizeof(int),
674 .proc_handler = &proc_dointvec,
678 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
679 .procname = "userprocess_debug",
680 .data = &sysctl_userprocess_debug,
681 .maxlen = sizeof(int),
683 .proc_handler = &proc_dointvec,
687 .ctl_name = KERN_PIDMAX,
688 .procname = "pid_max",
690 .maxlen = sizeof (int),
692 .proc_handler = &proc_dointvec_minmax,
693 .strategy = sysctl_intvec,
694 .extra1 = &pid_max_min,
695 .extra2 = &pid_max_max,
698 .ctl_name = KERN_PANIC_ON_OOPS,
699 .procname = "panic_on_oops",
700 .data = &panic_on_oops,
701 .maxlen = sizeof(int),
703 .proc_handler = &proc_dointvec,
705 #if defined CONFIG_PRINTK
707 .ctl_name = KERN_PRINTK,
708 .procname = "printk",
709 .data = &console_loglevel,
710 .maxlen = 4*sizeof(int),
712 .proc_handler = &proc_dointvec,
715 .ctl_name = KERN_PRINTK_RATELIMIT,
716 .procname = "printk_ratelimit",
717 .data = &printk_ratelimit_state.interval,
718 .maxlen = sizeof(int),
720 .proc_handler = &proc_dointvec_jiffies,
721 .strategy = &sysctl_jiffies,
724 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
725 .procname = "printk_ratelimit_burst",
726 .data = &printk_ratelimit_state.burst,
727 .maxlen = sizeof(int),
729 .proc_handler = &proc_dointvec,
732 .ctl_name = CTL_UNNUMBERED,
733 .procname = "printk_delay",
734 .data = &printk_delay_msec,
735 .maxlen = sizeof(int),
737 .proc_handler = &proc_dointvec_minmax,
738 .strategy = &sysctl_intvec,
740 .extra2 = &ten_thousand,
744 .ctl_name = KERN_NGROUPS_MAX,
745 .procname = "ngroups_max",
746 .data = &ngroups_max,
747 .maxlen = sizeof (int),
749 .proc_handler = &proc_dointvec,
751 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
753 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
754 .procname = "unknown_nmi_panic",
755 .data = &unknown_nmi_panic,
756 .maxlen = sizeof (int),
758 .proc_handler = &proc_dointvec,
761 .procname = "nmi_watchdog",
762 .data = &nmi_watchdog_enabled,
763 .maxlen = sizeof (int),
765 .proc_handler = &proc_nmi_enabled,
768 #if defined(CONFIG_X86)
770 .ctl_name = KERN_PANIC_ON_NMI,
771 .procname = "panic_on_unrecovered_nmi",
772 .data = &panic_on_unrecovered_nmi,
773 .maxlen = sizeof(int),
775 .proc_handler = &proc_dointvec,
778 .ctl_name = CTL_UNNUMBERED,
779 .procname = "panic_on_io_nmi",
780 .data = &panic_on_io_nmi,
781 .maxlen = sizeof(int),
783 .proc_handler = &proc_dointvec,
786 .ctl_name = KERN_BOOTLOADER_TYPE,
787 .procname = "bootloader_type",
788 .data = &bootloader_type,
789 .maxlen = sizeof (int),
791 .proc_handler = &proc_dointvec,
794 .ctl_name = CTL_UNNUMBERED,
795 .procname = "bootloader_version",
796 .data = &bootloader_version,
797 .maxlen = sizeof (int),
799 .proc_handler = &proc_dointvec,
802 .ctl_name = CTL_UNNUMBERED,
803 .procname = "kstack_depth_to_print",
804 .data = &kstack_depth_to_print,
805 .maxlen = sizeof(int),
807 .proc_handler = &proc_dointvec,
810 .ctl_name = CTL_UNNUMBERED,
811 .procname = "io_delay_type",
812 .data = &io_delay_type,
813 .maxlen = sizeof(int),
815 .proc_handler = &proc_dointvec,
818 #if defined(CONFIG_MMU)
820 .ctl_name = KERN_RANDOMIZE,
821 .procname = "randomize_va_space",
822 .data = &randomize_va_space,
823 .maxlen = sizeof(int),
825 .proc_handler = &proc_dointvec,
828 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
830 .ctl_name = KERN_SPIN_RETRY,
831 .procname = "spin_retry",
833 .maxlen = sizeof (int),
835 .proc_handler = &proc_dointvec,
838 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
840 .procname = "acpi_video_flags",
841 .data = &acpi_realmode_flags,
842 .maxlen = sizeof (unsigned long),
844 .proc_handler = &proc_doulongvec_minmax,
849 .ctl_name = KERN_IA64_UNALIGNED,
850 .procname = "ignore-unaligned-usertrap",
851 .data = &no_unaligned_warning,
852 .maxlen = sizeof (int),
854 .proc_handler = &proc_dointvec,
857 .ctl_name = CTL_UNNUMBERED,
858 .procname = "unaligned-dump-stack",
859 .data = &unaligned_dump_stack,
860 .maxlen = sizeof (int),
862 .proc_handler = &proc_dointvec,
865 #ifdef CONFIG_DETECT_SOFTLOCKUP
867 .ctl_name = CTL_UNNUMBERED,
868 .procname = "softlockup_panic",
869 .data = &softlockup_panic,
870 .maxlen = sizeof(int),
872 .proc_handler = &proc_dointvec_minmax,
873 .strategy = &sysctl_intvec,
878 .ctl_name = CTL_UNNUMBERED,
879 .procname = "softlockup_thresh",
880 .data = &softlockup_thresh,
881 .maxlen = sizeof(int),
883 .proc_handler = &proc_dosoftlockup_thresh,
884 .strategy = &sysctl_intvec,
889 #ifdef CONFIG_DETECT_HUNG_TASK
891 .ctl_name = CTL_UNNUMBERED,
892 .procname = "hung_task_panic",
893 .data = &sysctl_hung_task_panic,
894 .maxlen = sizeof(int),
896 .proc_handler = &proc_dointvec_minmax,
897 .strategy = &sysctl_intvec,
902 .ctl_name = CTL_UNNUMBERED,
903 .procname = "hung_task_check_count",
904 .data = &sysctl_hung_task_check_count,
905 .maxlen = sizeof(unsigned long),
907 .proc_handler = &proc_doulongvec_minmax,
908 .strategy = &sysctl_intvec,
911 .ctl_name = CTL_UNNUMBERED,
912 .procname = "hung_task_timeout_secs",
913 .data = &sysctl_hung_task_timeout_secs,
914 .maxlen = sizeof(unsigned long),
916 .proc_handler = &proc_dohung_task_timeout_secs,
917 .strategy = &sysctl_intvec,
920 .ctl_name = CTL_UNNUMBERED,
921 .procname = "hung_task_warnings",
922 .data = &sysctl_hung_task_warnings,
923 .maxlen = sizeof(unsigned long),
925 .proc_handler = &proc_doulongvec_minmax,
926 .strategy = &sysctl_intvec,
931 .ctl_name = KERN_COMPAT_LOG,
932 .procname = "compat-log",
934 .maxlen = sizeof (int),
936 .proc_handler = &proc_dointvec,
939 #ifdef CONFIG_RT_MUTEXES
941 .ctl_name = KERN_MAX_LOCK_DEPTH,
942 .procname = "max_lock_depth",
943 .data = &max_lock_depth,
944 .maxlen = sizeof(int),
946 .proc_handler = &proc_dointvec,
950 .ctl_name = CTL_UNNUMBERED,
951 .procname = "poweroff_cmd",
952 .data = &poweroff_cmd,
953 .maxlen = POWEROFF_CMD_PATH_LEN,
955 .proc_handler = &proc_dostring,
956 .strategy = &sysctl_string,
960 .ctl_name = CTL_UNNUMBERED,
963 .child = key_sysctls,
966 #ifdef CONFIG_RCU_TORTURE_TEST
968 .ctl_name = CTL_UNNUMBERED,
969 .procname = "rcutorture_runnable",
970 .data = &rcutorture_runnable,
971 .maxlen = sizeof(int),
973 .proc_handler = &proc_dointvec,
976 #ifdef CONFIG_SLOW_WORK
978 .ctl_name = CTL_UNNUMBERED,
979 .procname = "slow-work",
981 .child = slow_work_sysctls,
984 #ifdef CONFIG_PERF_EVENTS
986 .ctl_name = CTL_UNNUMBERED,
987 .procname = "perf_event_paranoid",
988 .data = &sysctl_perf_event_paranoid,
989 .maxlen = sizeof(sysctl_perf_event_paranoid),
991 .proc_handler = &proc_dointvec,
994 .ctl_name = CTL_UNNUMBERED,
995 .procname = "perf_event_mlock_kb",
996 .data = &sysctl_perf_event_mlock,
997 .maxlen = sizeof(sysctl_perf_event_mlock),
999 .proc_handler = &proc_dointvec,
1002 .ctl_name = CTL_UNNUMBERED,
1003 .procname = "perf_event_max_sample_rate",
1004 .data = &sysctl_perf_event_sample_rate,
1005 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1007 .proc_handler = &proc_dointvec,
1010 #ifdef CONFIG_KMEMCHECK
1012 .ctl_name = CTL_UNNUMBERED,
1013 .procname = "kmemcheck",
1014 .data = &kmemcheck_enabled,
1015 .maxlen = sizeof(int),
1017 .proc_handler = &proc_dointvec,
1022 .ctl_name = CTL_UNNUMBERED,
1023 .procname = "blk_iopoll",
1024 .data = &blk_iopoll_enabled,
1025 .maxlen = sizeof(int),
1027 .proc_handler = &proc_dointvec,
1031 * NOTE: do not add new entries to this table unless you have read
1032 * Documentation/sysctl/ctl_unnumbered.txt
1037 static struct ctl_table vm_table[] = {
1039 .ctl_name = VM_OVERCOMMIT_MEMORY,
1040 .procname = "overcommit_memory",
1041 .data = &sysctl_overcommit_memory,
1042 .maxlen = sizeof(sysctl_overcommit_memory),
1044 .proc_handler = &proc_dointvec,
1047 .ctl_name = VM_PANIC_ON_OOM,
1048 .procname = "panic_on_oom",
1049 .data = &sysctl_panic_on_oom,
1050 .maxlen = sizeof(sysctl_panic_on_oom),
1052 .proc_handler = &proc_dointvec,
1055 .ctl_name = CTL_UNNUMBERED,
1056 .procname = "oom_kill_allocating_task",
1057 .data = &sysctl_oom_kill_allocating_task,
1058 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1060 .proc_handler = &proc_dointvec,
1063 .ctl_name = CTL_UNNUMBERED,
1064 .procname = "oom_dump_tasks",
1065 .data = &sysctl_oom_dump_tasks,
1066 .maxlen = sizeof(sysctl_oom_dump_tasks),
1068 .proc_handler = &proc_dointvec,
1071 .ctl_name = VM_OVERCOMMIT_RATIO,
1072 .procname = "overcommit_ratio",
1073 .data = &sysctl_overcommit_ratio,
1074 .maxlen = sizeof(sysctl_overcommit_ratio),
1076 .proc_handler = &proc_dointvec,
1079 .ctl_name = VM_PAGE_CLUSTER,
1080 .procname = "page-cluster",
1081 .data = &page_cluster,
1082 .maxlen = sizeof(int),
1084 .proc_handler = &proc_dointvec,
1087 .ctl_name = VM_DIRTY_BACKGROUND,
1088 .procname = "dirty_background_ratio",
1089 .data = &dirty_background_ratio,
1090 .maxlen = sizeof(dirty_background_ratio),
1092 .proc_handler = &dirty_background_ratio_handler,
1093 .strategy = &sysctl_intvec,
1095 .extra2 = &one_hundred,
1098 .ctl_name = CTL_UNNUMBERED,
1099 .procname = "dirty_background_bytes",
1100 .data = &dirty_background_bytes,
1101 .maxlen = sizeof(dirty_background_bytes),
1103 .proc_handler = &dirty_background_bytes_handler,
1104 .strategy = &sysctl_intvec,
1108 .ctl_name = VM_DIRTY_RATIO,
1109 .procname = "dirty_ratio",
1110 .data = &vm_dirty_ratio,
1111 .maxlen = sizeof(vm_dirty_ratio),
1113 .proc_handler = &dirty_ratio_handler,
1114 .strategy = &sysctl_intvec,
1116 .extra2 = &one_hundred,
1119 .ctl_name = CTL_UNNUMBERED,
1120 .procname = "dirty_bytes",
1121 .data = &vm_dirty_bytes,
1122 .maxlen = sizeof(vm_dirty_bytes),
1124 .proc_handler = &dirty_bytes_handler,
1125 .strategy = &sysctl_intvec,
1126 .extra1 = &dirty_bytes_min,
1129 .procname = "dirty_writeback_centisecs",
1130 .data = &dirty_writeback_interval,
1131 .maxlen = sizeof(dirty_writeback_interval),
1133 .proc_handler = &dirty_writeback_centisecs_handler,
1136 .procname = "dirty_expire_centisecs",
1137 .data = &dirty_expire_interval,
1138 .maxlen = sizeof(dirty_expire_interval),
1140 .proc_handler = &proc_dointvec,
1143 .ctl_name = VM_NR_PDFLUSH_THREADS,
1144 .procname = "nr_pdflush_threads",
1145 .data = &nr_pdflush_threads,
1146 .maxlen = sizeof nr_pdflush_threads,
1147 .mode = 0444 /* read-only*/,
1148 .proc_handler = &proc_dointvec,
1151 .ctl_name = VM_SWAPPINESS,
1152 .procname = "swappiness",
1153 .data = &vm_swappiness,
1154 .maxlen = sizeof(vm_swappiness),
1156 .proc_handler = &proc_dointvec_minmax,
1157 .strategy = &sysctl_intvec,
1159 .extra2 = &one_hundred,
1161 #ifdef CONFIG_HUGETLB_PAGE
1163 .procname = "nr_hugepages",
1165 .maxlen = sizeof(unsigned long),
1167 .proc_handler = &hugetlb_sysctl_handler,
1168 .extra1 = (void *)&hugetlb_zero,
1169 .extra2 = (void *)&hugetlb_infinity,
1172 .ctl_name = VM_HUGETLB_GROUP,
1173 .procname = "hugetlb_shm_group",
1174 .data = &sysctl_hugetlb_shm_group,
1175 .maxlen = sizeof(gid_t),
1177 .proc_handler = &proc_dointvec,
1180 .ctl_name = CTL_UNNUMBERED,
1181 .procname = "hugepages_treat_as_movable",
1182 .data = &hugepages_treat_as_movable,
1183 .maxlen = sizeof(int),
1185 .proc_handler = &hugetlb_treat_movable_handler,
1188 .ctl_name = CTL_UNNUMBERED,
1189 .procname = "nr_overcommit_hugepages",
1191 .maxlen = sizeof(unsigned long),
1193 .proc_handler = &hugetlb_overcommit_handler,
1194 .extra1 = (void *)&hugetlb_zero,
1195 .extra2 = (void *)&hugetlb_infinity,
1199 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1200 .procname = "lowmem_reserve_ratio",
1201 .data = &sysctl_lowmem_reserve_ratio,
1202 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1204 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1205 .strategy = &sysctl_intvec,
1208 .ctl_name = VM_DROP_PAGECACHE,
1209 .procname = "drop_caches",
1210 .data = &sysctl_drop_caches,
1211 .maxlen = sizeof(int),
1213 .proc_handler = drop_caches_sysctl_handler,
1214 .strategy = &sysctl_intvec,
1217 .ctl_name = VM_MIN_FREE_KBYTES,
1218 .procname = "min_free_kbytes",
1219 .data = &min_free_kbytes,
1220 .maxlen = sizeof(min_free_kbytes),
1222 .proc_handler = &min_free_kbytes_sysctl_handler,
1223 .strategy = &sysctl_intvec,
1227 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1228 .procname = "percpu_pagelist_fraction",
1229 .data = &percpu_pagelist_fraction,
1230 .maxlen = sizeof(percpu_pagelist_fraction),
1232 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1233 .strategy = &sysctl_intvec,
1234 .extra1 = &min_percpu_pagelist_fract,
1238 .ctl_name = VM_MAX_MAP_COUNT,
1239 .procname = "max_map_count",
1240 .data = &sysctl_max_map_count,
1241 .maxlen = sizeof(sysctl_max_map_count),
1243 .proc_handler = &proc_dointvec
1247 .ctl_name = CTL_UNNUMBERED,
1248 .procname = "nr_trim_pages",
1249 .data = &sysctl_nr_trim_pages,
1250 .maxlen = sizeof(sysctl_nr_trim_pages),
1252 .proc_handler = &proc_dointvec_minmax,
1253 .strategy = &sysctl_intvec,
1258 .ctl_name = VM_LAPTOP_MODE,
1259 .procname = "laptop_mode",
1260 .data = &laptop_mode,
1261 .maxlen = sizeof(laptop_mode),
1263 .proc_handler = &proc_dointvec_jiffies,
1264 .strategy = &sysctl_jiffies,
1267 .ctl_name = VM_BLOCK_DUMP,
1268 .procname = "block_dump",
1269 .data = &block_dump,
1270 .maxlen = sizeof(block_dump),
1272 .proc_handler = &proc_dointvec,
1273 .strategy = &sysctl_intvec,
1277 .ctl_name = VM_VFS_CACHE_PRESSURE,
1278 .procname = "vfs_cache_pressure",
1279 .data = &sysctl_vfs_cache_pressure,
1280 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1282 .proc_handler = &proc_dointvec,
1283 .strategy = &sysctl_intvec,
1286 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1288 .ctl_name = VM_LEGACY_VA_LAYOUT,
1289 .procname = "legacy_va_layout",
1290 .data = &sysctl_legacy_va_layout,
1291 .maxlen = sizeof(sysctl_legacy_va_layout),
1293 .proc_handler = &proc_dointvec,
1294 .strategy = &sysctl_intvec,
1300 .ctl_name = VM_ZONE_RECLAIM_MODE,
1301 .procname = "zone_reclaim_mode",
1302 .data = &zone_reclaim_mode,
1303 .maxlen = sizeof(zone_reclaim_mode),
1305 .proc_handler = &proc_dointvec,
1306 .strategy = &sysctl_intvec,
1310 .ctl_name = VM_MIN_UNMAPPED,
1311 .procname = "min_unmapped_ratio",
1312 .data = &sysctl_min_unmapped_ratio,
1313 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1315 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1316 .strategy = &sysctl_intvec,
1318 .extra2 = &one_hundred,
1321 .ctl_name = VM_MIN_SLAB,
1322 .procname = "min_slab_ratio",
1323 .data = &sysctl_min_slab_ratio,
1324 .maxlen = sizeof(sysctl_min_slab_ratio),
1326 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1327 .strategy = &sysctl_intvec,
1329 .extra2 = &one_hundred,
1334 .ctl_name = CTL_UNNUMBERED,
1335 .procname = "stat_interval",
1336 .data = &sysctl_stat_interval,
1337 .maxlen = sizeof(sysctl_stat_interval),
1339 .proc_handler = &proc_dointvec_jiffies,
1340 .strategy = &sysctl_jiffies,
1344 .ctl_name = CTL_UNNUMBERED,
1345 .procname = "mmap_min_addr",
1346 .data = &dac_mmap_min_addr,
1347 .maxlen = sizeof(unsigned long),
1349 .proc_handler = &mmap_min_addr_handler,
1353 .ctl_name = CTL_UNNUMBERED,
1354 .procname = "numa_zonelist_order",
1355 .data = &numa_zonelist_order,
1356 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1358 .proc_handler = &numa_zonelist_order_handler,
1359 .strategy = &sysctl_string,
1362 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1363 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1365 .ctl_name = VM_VDSO_ENABLED,
1366 .procname = "vdso_enabled",
1367 .data = &vdso_enabled,
1368 .maxlen = sizeof(vdso_enabled),
1370 .proc_handler = &proc_dointvec,
1371 .strategy = &sysctl_intvec,
1375 #ifdef CONFIG_HIGHMEM
1377 .ctl_name = CTL_UNNUMBERED,
1378 .procname = "highmem_is_dirtyable",
1379 .data = &vm_highmem_is_dirtyable,
1380 .maxlen = sizeof(vm_highmem_is_dirtyable),
1382 .proc_handler = &proc_dointvec_minmax,
1383 .strategy = &sysctl_intvec,
1389 .ctl_name = CTL_UNNUMBERED,
1390 .procname = "scan_unevictable_pages",
1391 .data = &scan_unevictable_pages,
1392 .maxlen = sizeof(scan_unevictable_pages),
1394 .proc_handler = &scan_unevictable_handler,
1396 #ifdef CONFIG_MEMORY_FAILURE
1398 .ctl_name = CTL_UNNUMBERED,
1399 .procname = "memory_failure_early_kill",
1400 .data = &sysctl_memory_failure_early_kill,
1401 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1403 .proc_handler = &proc_dointvec_minmax,
1404 .strategy = &sysctl_intvec,
1409 .ctl_name = CTL_UNNUMBERED,
1410 .procname = "memory_failure_recovery",
1411 .data = &sysctl_memory_failure_recovery,
1412 .maxlen = sizeof(sysctl_memory_failure_recovery),
1414 .proc_handler = &proc_dointvec_minmax,
1415 .strategy = &sysctl_intvec,
1422 * NOTE: do not add new entries to this table unless you have read
1423 * Documentation/sysctl/ctl_unnumbered.txt
1428 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1429 static struct ctl_table binfmt_misc_table[] = {
1434 static struct ctl_table fs_table[] = {
1436 .ctl_name = FS_NRINODE,
1437 .procname = "inode-nr",
1438 .data = &inodes_stat,
1439 .maxlen = 2*sizeof(int),
1441 .proc_handler = &proc_dointvec,
1444 .ctl_name = FS_STATINODE,
1445 .procname = "inode-state",
1446 .data = &inodes_stat,
1447 .maxlen = 7*sizeof(int),
1449 .proc_handler = &proc_dointvec,
1452 .procname = "file-nr",
1453 .data = &files_stat,
1454 .maxlen = 3*sizeof(int),
1456 .proc_handler = &proc_nr_files,
1459 .ctl_name = FS_MAXFILE,
1460 .procname = "file-max",
1461 .data = &files_stat.max_files,
1462 .maxlen = sizeof(int),
1464 .proc_handler = &proc_dointvec,
1467 .ctl_name = CTL_UNNUMBERED,
1468 .procname = "nr_open",
1469 .data = &sysctl_nr_open,
1470 .maxlen = sizeof(int),
1472 .proc_handler = &proc_dointvec_minmax,
1473 .extra1 = &sysctl_nr_open_min,
1474 .extra2 = &sysctl_nr_open_max,
1477 .ctl_name = FS_DENTRY,
1478 .procname = "dentry-state",
1479 .data = &dentry_stat,
1480 .maxlen = 6*sizeof(int),
1482 .proc_handler = &proc_dointvec,
1485 .ctl_name = FS_OVERFLOWUID,
1486 .procname = "overflowuid",
1487 .data = &fs_overflowuid,
1488 .maxlen = sizeof(int),
1490 .proc_handler = &proc_dointvec_minmax,
1491 .strategy = &sysctl_intvec,
1492 .extra1 = &minolduid,
1493 .extra2 = &maxolduid,
1496 .ctl_name = FS_OVERFLOWGID,
1497 .procname = "overflowgid",
1498 .data = &fs_overflowgid,
1499 .maxlen = sizeof(int),
1501 .proc_handler = &proc_dointvec_minmax,
1502 .strategy = &sysctl_intvec,
1503 .extra1 = &minolduid,
1504 .extra2 = &maxolduid,
1506 #ifdef CONFIG_FILE_LOCKING
1508 .ctl_name = FS_LEASES,
1509 .procname = "leases-enable",
1510 .data = &leases_enable,
1511 .maxlen = sizeof(int),
1513 .proc_handler = &proc_dointvec,
1516 #ifdef CONFIG_DNOTIFY
1518 .ctl_name = FS_DIR_NOTIFY,
1519 .procname = "dir-notify-enable",
1520 .data = &dir_notify_enable,
1521 .maxlen = sizeof(int),
1523 .proc_handler = &proc_dointvec,
1527 #ifdef CONFIG_FILE_LOCKING
1529 .ctl_name = FS_LEASE_TIME,
1530 .procname = "lease-break-time",
1531 .data = &lease_break_time,
1532 .maxlen = sizeof(int),
1534 .proc_handler = &proc_dointvec,
1539 .procname = "aio-nr",
1541 .maxlen = sizeof(aio_nr),
1543 .proc_handler = &proc_doulongvec_minmax,
1546 .procname = "aio-max-nr",
1547 .data = &aio_max_nr,
1548 .maxlen = sizeof(aio_max_nr),
1550 .proc_handler = &proc_doulongvec_minmax,
1552 #endif /* CONFIG_AIO */
1553 #ifdef CONFIG_INOTIFY_USER
1555 .ctl_name = FS_INOTIFY,
1556 .procname = "inotify",
1558 .child = inotify_table,
1563 .procname = "epoll",
1565 .child = epoll_table,
1570 .ctl_name = KERN_SETUID_DUMPABLE,
1571 .procname = "suid_dumpable",
1572 .data = &suid_dumpable,
1573 .maxlen = sizeof(int),
1575 .proc_handler = &proc_dointvec_minmax,
1576 .strategy = &sysctl_intvec,
1580 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1582 .ctl_name = CTL_UNNUMBERED,
1583 .procname = "binfmt_misc",
1585 .child = binfmt_misc_table,
1589 * NOTE: do not add new entries to this table unless you have read
1590 * Documentation/sysctl/ctl_unnumbered.txt
1595 static struct ctl_table debug_table[] = {
1596 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1598 .ctl_name = CTL_UNNUMBERED,
1599 .procname = "exception-trace",
1600 .data = &show_unhandled_signals,
1601 .maxlen = sizeof(int),
1603 .proc_handler = proc_dointvec
1609 static struct ctl_table dev_table[] = {
1613 static DEFINE_SPINLOCK(sysctl_lock);
1615 /* called under sysctl_lock */
1616 static int use_table(struct ctl_table_header *p)
1618 if (unlikely(p->unregistering))
1624 /* called under sysctl_lock */
1625 static void unuse_table(struct ctl_table_header *p)
1628 if (unlikely(p->unregistering))
1629 complete(p->unregistering);
1632 /* called under sysctl_lock, will reacquire if has to wait */
1633 static void start_unregistering(struct ctl_table_header *p)
1636 * if p->used is 0, nobody will ever touch that entry again;
1637 * we'll eliminate all paths to it before dropping sysctl_lock
1639 if (unlikely(p->used)) {
1640 struct completion wait;
1641 init_completion(&wait);
1642 p->unregistering = &wait;
1643 spin_unlock(&sysctl_lock);
1644 wait_for_completion(&wait);
1645 spin_lock(&sysctl_lock);
1647 /* anything non-NULL; we'll never dereference it */
1648 p->unregistering = ERR_PTR(-EINVAL);
1651 * do not remove from the list until nobody holds it; walking the
1652 * list in do_sysctl() relies on that.
1654 list_del_init(&p->ctl_entry);
1657 void sysctl_head_get(struct ctl_table_header *head)
1659 spin_lock(&sysctl_lock);
1661 spin_unlock(&sysctl_lock);
1664 void sysctl_head_put(struct ctl_table_header *head)
1666 spin_lock(&sysctl_lock);
1669 spin_unlock(&sysctl_lock);
1672 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1676 spin_lock(&sysctl_lock);
1677 if (!use_table(head))
1678 head = ERR_PTR(-ENOENT);
1679 spin_unlock(&sysctl_lock);
1683 void sysctl_head_finish(struct ctl_table_header *head)
1687 spin_lock(&sysctl_lock);
1689 spin_unlock(&sysctl_lock);
1692 static struct ctl_table_set *
1693 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1695 struct ctl_table_set *set = &root->default_set;
1697 set = root->lookup(root, namespaces);
1701 static struct list_head *
1702 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1704 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1708 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1709 struct ctl_table_header *prev)
1711 struct ctl_table_root *root;
1712 struct list_head *header_list;
1713 struct ctl_table_header *head;
1714 struct list_head *tmp;
1716 spin_lock(&sysctl_lock);
1719 tmp = &prev->ctl_entry;
1723 tmp = &root_table_header.ctl_entry;
1725 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1727 if (!use_table(head))
1729 spin_unlock(&sysctl_lock);
1734 header_list = lookup_header_list(root, namespaces);
1735 if (tmp != header_list)
1739 root = list_entry(root->root_list.next,
1740 struct ctl_table_root, root_list);
1741 if (root == &sysctl_table_root)
1743 header_list = lookup_header_list(root, namespaces);
1744 } while (list_empty(header_list));
1745 tmp = header_list->next;
1748 spin_unlock(&sysctl_lock);
1752 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1754 return __sysctl_head_next(current->nsproxy, prev);
1757 void register_sysctl_root(struct ctl_table_root *root)
1759 spin_lock(&sysctl_lock);
1760 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1761 spin_unlock(&sysctl_lock);
1764 #ifdef CONFIG_SYSCTL_SYSCALL
1765 /* Perform the actual read/write of a sysctl table entry. */
1766 static int do_sysctl_strategy(struct ctl_table_root *root,
1767 struct ctl_table *table,
1768 void __user *oldval, size_t __user *oldlenp,
1769 void __user *newval, size_t newlen)
1777 if (sysctl_perm(root, table, op))
1780 if (table->strategy) {
1781 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1788 /* If there is no strategy routine, or if the strategy returns
1789 * zero, proceed with automatic r/w */
1790 if (table->data && table->maxlen) {
1791 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1798 static int parse_table(int __user *name, int nlen,
1799 void __user *oldval, size_t __user *oldlenp,
1800 void __user *newval, size_t newlen,
1801 struct ctl_table_root *root,
1802 struct ctl_table *table)
1808 if (get_user(n, name))
1810 for ( ; table->ctl_name || table->procname; table++) {
1811 if (!table->ctl_name)
1813 if (n == table->ctl_name) {
1816 if (sysctl_perm(root, table, MAY_EXEC))
1820 table = table->child;
1823 error = do_sysctl_strategy(root, table,
1832 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1833 void __user *newval, size_t newlen)
1835 struct ctl_table_header *head;
1836 int error = -ENOTDIR;
1838 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1842 if (!oldlenp || get_user(old_len, oldlenp))
1846 for (head = sysctl_head_next(NULL); head;
1847 head = sysctl_head_next(head)) {
1848 error = parse_table(name, nlen, oldval, oldlenp,
1850 head->root, head->ctl_table);
1851 if (error != -ENOTDIR) {
1852 sysctl_head_finish(head);
1859 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1861 struct __sysctl_args tmp;
1864 if (copy_from_user(&tmp, args, sizeof(tmp)))
1867 error = deprecated_sysctl_warning(&tmp);
1872 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1873 tmp.newval, tmp.newlen);
1878 #endif /* CONFIG_SYSCTL_SYSCALL */
1881 * sysctl_perm does NOT grant the superuser all rights automatically, because
1882 * some sysctl variables are readonly even to root.
1885 static int test_perm(int mode, int op)
1887 if (!current_euid())
1889 else if (in_egroup_p(0))
1891 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1896 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1901 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1905 if (root->permissions)
1906 mode = root->permissions(root, current->nsproxy, table);
1910 return test_perm(mode, op);
1913 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1915 for (; table->ctl_name || table->procname; table++) {
1916 table->parent = parent;
1918 sysctl_set_parent(table, table->child);
1922 static __init int sysctl_init(void)
1924 sysctl_set_parent(NULL, root_table);
1925 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1928 err = sysctl_check_table(current->nsproxy, root_table);
1934 core_initcall(sysctl_init);
1936 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1937 struct ctl_table *table)
1939 struct ctl_table *p;
1940 const char *s = branch->procname;
1942 /* branch should have named subdirectory as its first element */
1943 if (!s || !branch->child)
1946 /* ... and nothing else */
1947 if (branch[1].procname || branch[1].ctl_name)
1950 /* table should contain subdirectory with the same name */
1951 for (p = table; p->procname || p->ctl_name; p++) {
1954 if (p->procname && strcmp(p->procname, s) == 0)
1960 /* see if attaching q to p would be an improvement */
1961 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1963 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1964 struct ctl_table *next;
1966 int not_in_parent = !p->attached_by;
1968 while ((next = is_branch_in(by, to)) != NULL) {
1969 if (by == q->attached_by)
1971 if (to == p->attached_by)
1977 if (is_better && not_in_parent) {
1978 q->attached_by = by;
1979 q->attached_to = to;
1985 * __register_sysctl_paths - register a sysctl hierarchy
1986 * @root: List of sysctl headers to register on
1987 * @namespaces: Data to compute which lists of sysctl entries are visible
1988 * @path: The path to the directory the sysctl table is in.
1989 * @table: the top-level table structure
1991 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1992 * array. A completely 0 filled entry terminates the table.
1994 * The members of the &struct ctl_table structure are used as follows:
1996 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1997 * must be unique within that level of sysctl
1999 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
2000 * enter a sysctl file
2002 * data - a pointer to data for use by proc_handler
2004 * maxlen - the maximum size in bytes of the data
2006 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
2008 * child - a pointer to the child sysctl table if this entry is a directory, or
2011 * proc_handler - the text handler routine (described below)
2013 * strategy - the strategy routine (described below)
2015 * de - for internal use by the sysctl routines
2017 * extra1, extra2 - extra pointers usable by the proc handler routines
2019 * Leaf nodes in the sysctl tree will be represented by a single file
2020 * under /proc; non-leaf nodes will be represented by directories.
2022 * sysctl(2) can automatically manage read and write requests through
2023 * the sysctl table. The data and maxlen fields of the ctl_table
2024 * struct enable minimal validation of the values being written to be
2025 * performed, and the mode field allows minimal authentication.
2027 * More sophisticated management can be enabled by the provision of a
2028 * strategy routine with the table entry. This will be called before
2029 * any automatic read or write of the data is performed.
2031 * The strategy routine may return
2033 * < 0 - Error occurred (error is passed to user process)
2035 * 0 - OK - proceed with automatic read or write.
2037 * > 0 - OK - read or write has been done by the strategy routine, so
2038 * return immediately.
2040 * There must be a proc_handler routine for any terminal nodes
2041 * mirrored under /proc/sys (non-terminals are handled by a built-in
2042 * directory handler). Several default handlers are available to
2043 * cover common cases -
2045 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2046 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2047 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2049 * It is the handler's job to read the input buffer from user memory
2050 * and process it. The handler should return 0 on success.
2052 * This routine returns %NULL on a failure to register, and a pointer
2053 * to the table header on success.
2055 struct ctl_table_header *__register_sysctl_paths(
2056 struct ctl_table_root *root,
2057 struct nsproxy *namespaces,
2058 const struct ctl_path *path, struct ctl_table *table)
2060 struct ctl_table_header *header;
2061 struct ctl_table *new, **prevp;
2062 unsigned int n, npath;
2063 struct ctl_table_set *set;
2065 /* Count the path components */
2066 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2070 * For each path component, allocate a 2-element ctl_table array.
2071 * The first array element will be filled with the sysctl entry
2072 * for this, the second will be the sentinel (ctl_name == 0).
2074 * We allocate everything in one go so that we don't have to
2075 * worry about freeing additional memory in unregister_sysctl_table.
2077 header = kzalloc(sizeof(struct ctl_table_header) +
2078 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2082 new = (struct ctl_table *) (header + 1);
2084 /* Now connect the dots */
2085 prevp = &header->ctl_table;
2086 for (n = 0; n < npath; ++n, ++path) {
2087 /* Copy the procname */
2088 new->procname = path->procname;
2089 new->ctl_name = path->ctl_name;
2093 prevp = &new->child;
2098 header->ctl_table_arg = table;
2100 INIT_LIST_HEAD(&header->ctl_entry);
2102 header->unregistering = NULL;
2103 header->root = root;
2104 sysctl_set_parent(NULL, header->ctl_table);
2106 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
2107 if (sysctl_check_table(namespaces, header->ctl_table)) {
2112 spin_lock(&sysctl_lock);
2113 header->set = lookup_header_set(root, namespaces);
2114 header->attached_by = header->ctl_table;
2115 header->attached_to = root_table;
2116 header->parent = &root_table_header;
2117 for (set = header->set; set; set = set->parent) {
2118 struct ctl_table_header *p;
2119 list_for_each_entry(p, &set->list, ctl_entry) {
2120 if (p->unregistering)
2122 try_attach(p, header);
2125 header->parent->count++;
2126 list_add_tail(&header->ctl_entry, &header->set->list);
2127 spin_unlock(&sysctl_lock);
2133 * register_sysctl_table_path - register a sysctl table hierarchy
2134 * @path: The path to the directory the sysctl table is in.
2135 * @table: the top-level table structure
2137 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2138 * array. A completely 0 filled entry terminates the table.
2140 * See __register_sysctl_paths for more details.
2142 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2143 struct ctl_table *table)
2145 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2150 * register_sysctl_table - register a sysctl table hierarchy
2151 * @table: the top-level table structure
2153 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2154 * array. A completely 0 filled entry terminates the table.
2156 * See register_sysctl_paths for more details.
2158 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2160 static const struct ctl_path null_path[] = { {} };
2162 return register_sysctl_paths(null_path, table);
2166 * unregister_sysctl_table - unregister a sysctl table hierarchy
2167 * @header: the header returned from register_sysctl_table
2169 * Unregisters the sysctl table and all children. proc entries may not
2170 * actually be removed until they are no longer used by anyone.
2172 void unregister_sysctl_table(struct ctl_table_header * header)
2179 spin_lock(&sysctl_lock);
2180 start_unregistering(header);
2181 if (!--header->parent->count) {
2183 kfree(header->parent);
2185 if (!--header->count)
2187 spin_unlock(&sysctl_lock);
2190 int sysctl_is_seen(struct ctl_table_header *p)
2192 struct ctl_table_set *set = p->set;
2194 spin_lock(&sysctl_lock);
2195 if (p->unregistering)
2197 else if (!set->is_seen)
2200 res = set->is_seen(set);
2201 spin_unlock(&sysctl_lock);
2205 void setup_sysctl_set(struct ctl_table_set *p,
2206 struct ctl_table_set *parent,
2207 int (*is_seen)(struct ctl_table_set *))
2209 INIT_LIST_HEAD(&p->list);
2210 p->parent = parent ? parent : &sysctl_table_root.default_set;
2211 p->is_seen = is_seen;
2214 #else /* !CONFIG_SYSCTL */
2215 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2220 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2221 struct ctl_table *table)
2226 void unregister_sysctl_table(struct ctl_table_header * table)
2230 void setup_sysctl_set(struct ctl_table_set *p,
2231 struct ctl_table_set *parent,
2232 int (*is_seen)(struct ctl_table_set *))
2236 void sysctl_head_put(struct ctl_table_header *head)
2240 #endif /* CONFIG_SYSCTL */
2246 #ifdef CONFIG_PROC_SYSCTL
2248 static int _proc_do_string(void* data, int maxlen, int write,
2249 void __user *buffer,
2250 size_t *lenp, loff_t *ppos)
2256 if (!data || !maxlen || !*lenp) {
2264 while (len < *lenp) {
2265 if (get_user(c, p++))
2267 if (c == 0 || c == '\n')
2273 if(copy_from_user(data, buffer, len))
2275 ((char *) data)[len] = 0;
2293 if(copy_to_user(buffer, data, len))
2296 if(put_user('\n', ((char __user *) buffer) + len))
2307 * proc_dostring - read a string sysctl
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2314 * Reads/writes a string from/to the user buffer. If the kernel
2315 * buffer provided is not large enough to hold the string, the
2316 * string is truncated. The copied string is %NULL-terminated.
2317 * If the string is being read by the user process, it is copied
2318 * and a newline '\n' is added. It is truncated if the buffer is
2321 * Returns 0 on success.
2323 int proc_dostring(struct ctl_table *table, int write,
2324 void __user *buffer, size_t *lenp, loff_t *ppos)
2326 return _proc_do_string(table->data, table->maxlen, write,
2327 buffer, lenp, ppos);
2331 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2333 int write, void *data)
2336 *valp = *negp ? -*lvalp : *lvalp;
2341 *lvalp = (unsigned long)-val;
2344 *lvalp = (unsigned long)val;
2350 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2351 int write, void __user *buffer,
2352 size_t *lenp, loff_t *ppos,
2353 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2354 int write, void *data),
2357 #define TMPBUFLEN 21
2358 int *i, vleft, first = 1, neg;
2362 char buf[TMPBUFLEN], *p;
2363 char __user *s = buffer;
2365 if (!tbl_data || !table->maxlen || !*lenp ||
2366 (*ppos && !write)) {
2371 i = (int *) tbl_data;
2372 vleft = table->maxlen / sizeof(*i);
2376 conv = do_proc_dointvec_conv;
2378 for (; left && vleft--; i++, first=0) {
2393 if (len > sizeof(buf) - 1)
2394 len = sizeof(buf) - 1;
2395 if (copy_from_user(buf, s, len))
2399 if (*p == '-' && left > 1) {
2403 if (*p < '0' || *p > '9')
2406 lval = simple_strtoul(p, &p, 0);
2409 if ((len < left) && *p && !isspace(*p))
2414 if (conv(&neg, &lval, i, 1, data))
2421 if (conv(&neg, &lval, i, 0, data))
2424 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2428 if(copy_to_user(s, buf, len))
2435 if (!write && !first && left) {
2436 if(put_user('\n', s))
2443 if (get_user(c, s++))
2458 static int do_proc_dointvec(struct ctl_table *table, int write,
2459 void __user *buffer, size_t *lenp, loff_t *ppos,
2460 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2461 int write, void *data),
2464 return __do_proc_dointvec(table->data, table, write,
2465 buffer, lenp, ppos, conv, data);
2469 * proc_dointvec - read a vector of integers
2470 * @table: the sysctl table
2471 * @write: %TRUE if this is a write to the sysctl file
2472 * @buffer: the user buffer
2473 * @lenp: the size of the user buffer
2474 * @ppos: file position
2476 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2477 * values from/to the user buffer, treated as an ASCII string.
2479 * Returns 0 on success.
2481 int proc_dointvec(struct ctl_table *table, int write,
2482 void __user *buffer, size_t *lenp, loff_t *ppos)
2484 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2489 * Taint values can only be increased
2490 * This means we can safely use a temporary.
2492 static int proc_taint(struct ctl_table *table, int write,
2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2496 unsigned long tmptaint = get_taint();
2499 if (write && !capable(CAP_SYS_ADMIN))
2504 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2510 * Poor man's atomic or. Not worth adding a primitive
2511 * to everyone's atomic.h for this
2514 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2515 if ((tmptaint >> i) & 1)
2523 struct do_proc_dointvec_minmax_conv_param {
2528 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2530 int write, void *data)
2532 struct do_proc_dointvec_minmax_conv_param *param = data;
2534 int val = *negp ? -*lvalp : *lvalp;
2535 if ((param->min && *param->min > val) ||
2536 (param->max && *param->max < val))
2543 *lvalp = (unsigned long)-val;
2546 *lvalp = (unsigned long)val;
2553 * proc_dointvec_minmax - read a vector of integers with min/max values
2554 * @table: the sysctl table
2555 * @write: %TRUE if this is a write to the sysctl file
2556 * @buffer: the user buffer
2557 * @lenp: the size of the user buffer
2558 * @ppos: file position
2560 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2561 * values from/to the user buffer, treated as an ASCII string.
2563 * This routine will ensure the values are within the range specified by
2564 * table->extra1 (min) and table->extra2 (max).
2566 * Returns 0 on success.
2568 int proc_dointvec_minmax(struct ctl_table *table, int write,
2569 void __user *buffer, size_t *lenp, loff_t *ppos)
2571 struct do_proc_dointvec_minmax_conv_param param = {
2572 .min = (int *) table->extra1,
2573 .max = (int *) table->extra2,
2575 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2576 do_proc_dointvec_minmax_conv, ¶m);
2579 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2580 void __user *buffer,
2581 size_t *lenp, loff_t *ppos,
2582 unsigned long convmul,
2583 unsigned long convdiv)
2585 #define TMPBUFLEN 21
2586 unsigned long *i, *min, *max, val;
2587 int vleft, first=1, neg;
2589 char buf[TMPBUFLEN], *p;
2590 char __user *s = buffer;
2592 if (!data || !table->maxlen || !*lenp ||
2593 (*ppos && !write)) {
2598 i = (unsigned long *) data;
2599 min = (unsigned long *) table->extra1;
2600 max = (unsigned long *) table->extra2;
2601 vleft = table->maxlen / sizeof(unsigned long);
2604 for (; left && vleft--; i++, min++, max++, first=0) {
2619 if (len > TMPBUFLEN-1)
2621 if (copy_from_user(buf, s, len))
2625 if (*p == '-' && left > 1) {
2629 if (*p < '0' || *p > '9')
2631 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2633 if ((len < left) && *p && !isspace(*p))
2642 if ((min && val < *min) || (max && val > *max))
2649 sprintf(p, "%lu", convdiv * (*i) / convmul);
2653 if(copy_to_user(s, buf, len))
2660 if (!write && !first && left) {
2661 if(put_user('\n', s))
2668 if (get_user(c, s++))
2683 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2684 void __user *buffer,
2685 size_t *lenp, loff_t *ppos,
2686 unsigned long convmul,
2687 unsigned long convdiv)
2689 return __do_proc_doulongvec_minmax(table->data, table, write,
2690 buffer, lenp, ppos, convmul, convdiv);
2694 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2695 * @table: the sysctl table
2696 * @write: %TRUE if this is a write to the sysctl file
2697 * @buffer: the user buffer
2698 * @lenp: the size of the user buffer
2699 * @ppos: file position
2701 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2702 * values from/to the user buffer, treated as an ASCII string.
2704 * This routine will ensure the values are within the range specified by
2705 * table->extra1 (min) and table->extra2 (max).
2707 * Returns 0 on success.
2709 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2710 void __user *buffer, size_t *lenp, loff_t *ppos)
2712 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2716 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2717 * @table: the sysctl table
2718 * @write: %TRUE if this is a write to the sysctl file
2719 * @buffer: the user buffer
2720 * @lenp: the size of the user buffer
2721 * @ppos: file position
2723 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2724 * values from/to the user buffer, treated as an ASCII string. The values
2725 * are treated as milliseconds, and converted to jiffies when they are stored.
2727 * This routine will ensure the values are within the range specified by
2728 * table->extra1 (min) and table->extra2 (max).
2730 * Returns 0 on success.
2732 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2733 void __user *buffer,
2734 size_t *lenp, loff_t *ppos)
2736 return do_proc_doulongvec_minmax(table, write, buffer,
2737 lenp, ppos, HZ, 1000l);
2741 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2743 int write, void *data)
2746 if (*lvalp > LONG_MAX / HZ)
2748 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2754 lval = (unsigned long)-val;
2757 lval = (unsigned long)val;
2764 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2766 int write, void *data)
2769 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2771 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2777 lval = (unsigned long)-val;
2780 lval = (unsigned long)val;
2782 *lvalp = jiffies_to_clock_t(lval);
2787 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2789 int write, void *data)
2792 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2798 lval = (unsigned long)-val;
2801 lval = (unsigned long)val;
2803 *lvalp = jiffies_to_msecs(lval);
2809 * proc_dointvec_jiffies - read a vector of integers as seconds
2810 * @table: the sysctl table
2811 * @write: %TRUE if this is a write to the sysctl file
2812 * @buffer: the user buffer
2813 * @lenp: the size of the user buffer
2814 * @ppos: file position
2816 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2817 * values from/to the user buffer, treated as an ASCII string.
2818 * The values read are assumed to be in seconds, and are converted into
2821 * Returns 0 on success.
2823 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2824 void __user *buffer, size_t *lenp, loff_t *ppos)
2826 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2827 do_proc_dointvec_jiffies_conv,NULL);
2831 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2832 * @table: the sysctl table
2833 * @write: %TRUE if this is a write to the sysctl file
2834 * @buffer: the user buffer
2835 * @lenp: the size of the user buffer
2836 * @ppos: pointer to the file position
2838 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2839 * values from/to the user buffer, treated as an ASCII string.
2840 * The values read are assumed to be in 1/USER_HZ seconds, and
2841 * are converted into jiffies.
2843 * Returns 0 on success.
2845 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2846 void __user *buffer, size_t *lenp, loff_t *ppos)
2848 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2849 do_proc_dointvec_userhz_jiffies_conv,NULL);
2853 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2854 * @table: the sysctl table
2855 * @write: %TRUE if this is a write to the sysctl file
2856 * @buffer: the user buffer
2857 * @lenp: the size of the user buffer
2858 * @ppos: file position
2859 * @ppos: the current position in the file
2861 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2862 * values from/to the user buffer, treated as an ASCII string.
2863 * The values read are assumed to be in 1/1000 seconds, and
2864 * are converted into jiffies.
2866 * Returns 0 on success.
2868 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2869 void __user *buffer, size_t *lenp, loff_t *ppos)
2871 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2872 do_proc_dointvec_ms_jiffies_conv, NULL);
2875 static int proc_do_cad_pid(struct ctl_table *table, int write,
2876 void __user *buffer, size_t *lenp, loff_t *ppos)
2878 struct pid *new_pid;
2882 tmp = pid_vnr(cad_pid);
2884 r = __do_proc_dointvec(&tmp, table, write, buffer,
2885 lenp, ppos, NULL, NULL);
2889 new_pid = find_get_pid(tmp);
2893 put_pid(xchg(&cad_pid, new_pid));
2897 #else /* CONFIG_PROC_FS */
2899 int proc_dostring(struct ctl_table *table, int write,
2900 void __user *buffer, size_t *lenp, loff_t *ppos)
2905 int proc_dointvec(struct ctl_table *table, int write,
2906 void __user *buffer, size_t *lenp, loff_t *ppos)
2911 int proc_dointvec_minmax(struct ctl_table *table, int write,
2912 void __user *buffer, size_t *lenp, loff_t *ppos)
2917 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2918 void __user *buffer, size_t *lenp, loff_t *ppos)
2923 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2924 void __user *buffer, size_t *lenp, loff_t *ppos)
2929 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2930 void __user *buffer, size_t *lenp, loff_t *ppos)
2935 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2936 void __user *buffer, size_t *lenp, loff_t *ppos)
2941 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2942 void __user *buffer,
2943 size_t *lenp, loff_t *ppos)
2949 #endif /* CONFIG_PROC_FS */
2952 #ifdef CONFIG_SYSCTL_SYSCALL
2954 * General sysctl support routines
2957 /* The generic sysctl data routine (used if no strategy routine supplied) */
2958 int sysctl_data(struct ctl_table *table,
2959 void __user *oldval, size_t __user *oldlenp,
2960 void __user *newval, size_t newlen)
2964 /* Get out of I don't have a variable */
2965 if (!table->data || !table->maxlen)
2968 if (oldval && oldlenp) {
2969 if (get_user(len, oldlenp))
2972 if (len > table->maxlen)
2973 len = table->maxlen;
2974 if (copy_to_user(oldval, table->data, len))
2976 if (put_user(len, oldlenp))
2981 if (newval && newlen) {
2982 if (newlen > table->maxlen)
2983 newlen = table->maxlen;
2985 if (copy_from_user(table->data, newval, newlen))
2991 /* The generic string strategy routine: */
2992 int sysctl_string(struct ctl_table *table,
2993 void __user *oldval, size_t __user *oldlenp,
2994 void __user *newval, size_t newlen)
2996 if (!table->data || !table->maxlen)
2999 if (oldval && oldlenp) {
3001 if (get_user(bufsize, oldlenp))
3004 size_t len = strlen(table->data), copied;
3006 /* This shouldn't trigger for a well-formed sysctl */
3007 if (len > table->maxlen)
3008 len = table->maxlen;
3010 /* Copy up to a max of bufsize-1 bytes of the string */
3011 copied = (len >= bufsize) ? bufsize - 1 : len;
3013 if (copy_to_user(oldval, table->data, copied) ||
3014 put_user(0, (char __user *)(oldval + copied)))
3016 if (put_user(len, oldlenp))
3020 if (newval && newlen) {
3021 size_t len = newlen;
3022 if (len > table->maxlen)
3023 len = table->maxlen;
3024 if(copy_from_user(table->data, newval, len))
3026 if (len == table->maxlen)
3028 ((char *) table->data)[len] = 0;
3034 * This function makes sure that all of the integers in the vector
3035 * are between the minimum and maximum values given in the arrays
3036 * table->extra1 and table->extra2, respectively.
3038 int sysctl_intvec(struct ctl_table *table,
3039 void __user *oldval, size_t __user *oldlenp,
3040 void __user *newval, size_t newlen)
3043 if (newval && newlen) {
3044 int __user *vec = (int __user *) newval;
3045 int *min = (int *) table->extra1;
3046 int *max = (int *) table->extra2;
3050 if (newlen % sizeof(int) != 0)
3053 if (!table->extra1 && !table->extra2)
3056 if (newlen > table->maxlen)
3057 newlen = table->maxlen;
3058 length = newlen / sizeof(int);
3060 for (i = 0; i < length; i++) {
3062 if (get_user(value, vec + i))
3064 if (min && value < min[i])
3066 if (max && value > max[i])
3073 /* Strategy function to convert jiffies to seconds */
3074 int sysctl_jiffies(struct ctl_table *table,
3075 void __user *oldval, size_t __user *oldlenp,
3076 void __user *newval, size_t newlen)
3078 if (oldval && oldlenp) {
3081 if (get_user(olen, oldlenp))
3086 if (olen < sizeof(int))
3089 val = *(int *)(table->data) / HZ;
3090 if (put_user(val, (int __user *)oldval))
3092 if (put_user(sizeof(int), oldlenp))
3096 if (newval && newlen) {
3098 if (newlen != sizeof(int))
3100 if (get_user(new, (int __user *)newval))
3102 *(int *)(table->data) = new*HZ;
3107 /* Strategy function to convert jiffies to seconds */
3108 int sysctl_ms_jiffies(struct ctl_table *table,
3109 void __user *oldval, size_t __user *oldlenp,
3110 void __user *newval, size_t newlen)
3112 if (oldval && oldlenp) {
3115 if (get_user(olen, oldlenp))
3120 if (olen < sizeof(int))
3123 val = jiffies_to_msecs(*(int *)(table->data));
3124 if (put_user(val, (int __user *)oldval))
3126 if (put_user(sizeof(int), oldlenp))
3130 if (newval && newlen) {
3132 if (newlen != sizeof(int))
3134 if (get_user(new, (int __user *)newval))
3136 *(int *)(table->data) = msecs_to_jiffies(new);
3143 #else /* CONFIG_SYSCTL_SYSCALL */
3146 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3148 struct __sysctl_args tmp;
3151 if (copy_from_user(&tmp, args, sizeof(tmp)))
3154 error = deprecated_sysctl_warning(&tmp);
3156 /* If no error reading the parameters then just -ENOSYS ... */
3163 int sysctl_data(struct ctl_table *table,
3164 void __user *oldval, size_t __user *oldlenp,
3165 void __user *newval, size_t newlen)
3170 int sysctl_string(struct ctl_table *table,
3171 void __user *oldval, size_t __user *oldlenp,
3172 void __user *newval, size_t newlen)
3177 int sysctl_intvec(struct ctl_table *table,
3178 void __user *oldval, size_t __user *oldlenp,
3179 void __user *newval, size_t newlen)
3184 int sysctl_jiffies(struct ctl_table *table,
3185 void __user *oldval, size_t __user *oldlenp,
3186 void __user *newval, size_t newlen)
3191 int sysctl_ms_jiffies(struct ctl_table *table,
3192 void __user *oldval, size_t __user *oldlenp,
3193 void __user *newval, size_t newlen)
3198 #endif /* CONFIG_SYSCTL_SYSCALL */
3200 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3202 static int msg_count;
3203 int name[CTL_MAXNAME];
3206 /* Check args->nlen. */
3207 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3210 /* Read in the sysctl name for better debug message logging */
3211 for (i = 0; i < args->nlen; i++)
3212 if (get_user(name[i], args->name + i))
3215 /* Ignore accesses to kernel.version */
3216 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3219 if (msg_count < 5) {
3222 "warning: process `%s' used the deprecated sysctl "
3223 "system call with ", current->comm);
3224 for (i = 0; i < args->nlen; i++)
3225 printk("%d.", name[i]);
3232 * No sense putting this after each symbol definition, twice,
3233 * exception granted :-)
3235 EXPORT_SYMBOL(proc_dointvec);
3236 EXPORT_SYMBOL(proc_dointvec_jiffies);
3237 EXPORT_SYMBOL(proc_dointvec_minmax);
3238 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3239 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3240 EXPORT_SYMBOL(proc_dostring);
3241 EXPORT_SYMBOL(proc_doulongvec_minmax);
3242 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3243 EXPORT_SYMBOL(register_sysctl_table);
3244 EXPORT_SYMBOL(register_sysctl_paths);
3245 EXPORT_SYMBOL(sysctl_intvec);
3246 EXPORT_SYMBOL(sysctl_jiffies);
3247 EXPORT_SYMBOL(sysctl_ms_jiffies);
3248 EXPORT_SYMBOL(sysctl_string);
3249 EXPORT_SYMBOL(sysctl_data);
3250 EXPORT_SYMBOL(unregister_sysctl_table);