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/utsname.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/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
57 #include <asm/stacktrace.h>
61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
63 #if defined(CONFIG_SYSCTL)
65 /* External variables not in a header file. */
67 extern int print_fatal_signals;
68 extern int sysctl_overcommit_memory;
69 extern int sysctl_overcommit_ratio;
70 extern int sysctl_panic_on_oom;
71 extern int sysctl_oom_kill_allocating_task;
72 extern int sysctl_oom_dump_tasks;
73 extern int max_threads;
74 extern int core_uses_pid;
75 extern int suid_dumpable;
76 extern char core_pattern[];
78 extern int min_free_kbytes;
79 extern int pid_max_min, pid_max_max;
80 extern int sysctl_drop_caches;
81 extern int percpu_pagelist_fraction;
82 extern int compat_log;
83 extern int maps_protect;
84 extern int latencytop_enabled;
85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
86 #ifdef CONFIG_RCU_TORTURE_TEST
87 extern int rcutorture_runnable;
88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
90 /* Constants used for minimum and maximum */
91 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
95 #ifdef CONFIG_DETECT_SOFTLOCKUP
96 static int sixty = 60;
97 static int neg_one = -1;
105 static int one_hundred = 100;
107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108 static int maxolduid = 65535;
109 static int minolduid;
110 static int min_percpu_pagelist_fract = 8;
112 static int ngroups_max = NGROUPS_MAX;
114 #ifdef CONFIG_MODULES
115 extern char modprobe_path[];
117 #ifdef CONFIG_CHR_DEV_SG
118 extern int sg_big_buff;
122 extern char reboot_command [];
123 extern int stop_a_enabled;
124 extern int scons_pwroff;
128 extern int pwrsw_enabled;
129 extern int unaligned_enabled;
133 #ifdef CONFIG_MATHEMU
134 extern int sysctl_ieee_emulation_warnings;
136 extern int sysctl_userprocess_debug;
137 extern int spin_retry;
140 #ifdef CONFIG_BSD_PROCESS_ACCT
141 extern int acct_parm[];
145 extern int no_unaligned_warning;
148 #ifdef CONFIG_RT_MUTEXES
149 extern int max_lock_depth;
152 #ifdef CONFIG_PROC_SYSCTL
153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
154 void __user *buffer, size_t *lenp, loff_t *ppos);
155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
156 void __user *buffer, size_t *lenp, loff_t *ppos);
159 static struct ctl_table root_table[];
160 static struct ctl_table_root sysctl_table_root;
161 static struct ctl_table_header root_table_header = {
162 .ctl_table = root_table,
163 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
164 .root = &sysctl_table_root,
165 .set = &sysctl_table_root.default_set,
167 static struct ctl_table_root sysctl_table_root = {
168 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
169 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
172 static struct ctl_table kern_table[];
173 static struct ctl_table vm_table[];
174 static struct ctl_table fs_table[];
175 static struct ctl_table debug_table[];
176 static struct ctl_table dev_table[];
177 extern struct ctl_table random_table[];
178 #ifdef CONFIG_INOTIFY_USER
179 extern struct ctl_table inotify_table[];
182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
183 int sysctl_legacy_va_layout;
186 extern int prove_locking;
187 extern int lock_stat;
189 /* The default sysctl tables: */
191 static struct ctl_table root_table[] = {
193 .ctl_name = CTL_KERN,
194 .procname = "kernel",
211 .ctl_name = CTL_DEBUG,
214 .child = debug_table,
223 * NOTE: do not add new entries to this table unless you have read
224 * Documentation/sysctl/ctl_unnumbered.txt
229 #ifdef CONFIG_SCHED_DEBUG
230 static int min_sched_granularity_ns = 100000; /* 100 usecs */
231 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
232 static int min_wakeup_granularity_ns; /* 0 usecs */
233 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
236 static struct ctl_table kern_table[] = {
237 #ifdef CONFIG_SCHED_DEBUG
239 .ctl_name = CTL_UNNUMBERED,
240 .procname = "sched_min_granularity_ns",
241 .data = &sysctl_sched_min_granularity,
242 .maxlen = sizeof(unsigned int),
244 .proc_handler = &sched_nr_latency_handler,
245 .strategy = &sysctl_intvec,
246 .extra1 = &min_sched_granularity_ns,
247 .extra2 = &max_sched_granularity_ns,
250 .ctl_name = CTL_UNNUMBERED,
251 .procname = "sched_latency_ns",
252 .data = &sysctl_sched_latency,
253 .maxlen = sizeof(unsigned int),
255 .proc_handler = &sched_nr_latency_handler,
256 .strategy = &sysctl_intvec,
257 .extra1 = &min_sched_granularity_ns,
258 .extra2 = &max_sched_granularity_ns,
261 .ctl_name = CTL_UNNUMBERED,
262 .procname = "sched_wakeup_granularity_ns",
263 .data = &sysctl_sched_wakeup_granularity,
264 .maxlen = sizeof(unsigned int),
266 .proc_handler = &proc_dointvec_minmax,
267 .strategy = &sysctl_intvec,
268 .extra1 = &min_wakeup_granularity_ns,
269 .extra2 = &max_wakeup_granularity_ns,
272 .ctl_name = CTL_UNNUMBERED,
273 .procname = "sched_shares_ratelimit",
274 .data = &sysctl_sched_shares_ratelimit,
275 .maxlen = sizeof(unsigned int),
277 .proc_handler = &proc_dointvec,
280 .ctl_name = CTL_UNNUMBERED,
281 .procname = "sched_child_runs_first",
282 .data = &sysctl_sched_child_runs_first,
283 .maxlen = sizeof(unsigned int),
285 .proc_handler = &proc_dointvec,
288 .ctl_name = CTL_UNNUMBERED,
289 .procname = "sched_features",
290 .data = &sysctl_sched_features,
291 .maxlen = sizeof(unsigned int),
293 .proc_handler = &proc_dointvec,
296 .ctl_name = CTL_UNNUMBERED,
297 .procname = "sched_migration_cost",
298 .data = &sysctl_sched_migration_cost,
299 .maxlen = sizeof(unsigned int),
301 .proc_handler = &proc_dointvec,
304 .ctl_name = CTL_UNNUMBERED,
305 .procname = "sched_nr_migrate",
306 .data = &sysctl_sched_nr_migrate,
307 .maxlen = sizeof(unsigned int),
309 .proc_handler = &proc_dointvec,
313 .ctl_name = CTL_UNNUMBERED,
314 .procname = "sched_rt_period_us",
315 .data = &sysctl_sched_rt_period,
316 .maxlen = sizeof(unsigned int),
318 .proc_handler = &sched_rt_handler,
321 .ctl_name = CTL_UNNUMBERED,
322 .procname = "sched_rt_runtime_us",
323 .data = &sysctl_sched_rt_runtime,
324 .maxlen = sizeof(int),
326 .proc_handler = &sched_rt_handler,
329 .ctl_name = CTL_UNNUMBERED,
330 .procname = "sched_compat_yield",
331 .data = &sysctl_sched_compat_yield,
332 .maxlen = sizeof(unsigned int),
334 .proc_handler = &proc_dointvec,
336 #ifdef CONFIG_PROVE_LOCKING
338 .ctl_name = CTL_UNNUMBERED,
339 .procname = "prove_locking",
340 .data = &prove_locking,
341 .maxlen = sizeof(int),
343 .proc_handler = &proc_dointvec,
346 #ifdef CONFIG_LOCK_STAT
348 .ctl_name = CTL_UNNUMBERED,
349 .procname = "lock_stat",
351 .maxlen = sizeof(int),
353 .proc_handler = &proc_dointvec,
357 .ctl_name = KERN_PANIC,
359 .data = &panic_timeout,
360 .maxlen = sizeof(int),
362 .proc_handler = &proc_dointvec,
365 .ctl_name = KERN_CORE_USES_PID,
366 .procname = "core_uses_pid",
367 .data = &core_uses_pid,
368 .maxlen = sizeof(int),
370 .proc_handler = &proc_dointvec,
373 .ctl_name = KERN_CORE_PATTERN,
374 .procname = "core_pattern",
375 .data = core_pattern,
376 .maxlen = CORENAME_MAX_SIZE,
378 .proc_handler = &proc_dostring,
379 .strategy = &sysctl_string,
381 #ifdef CONFIG_PROC_SYSCTL
383 .procname = "tainted",
385 .maxlen = sizeof(int),
387 .proc_handler = &proc_dointvec_taint,
390 #ifdef CONFIG_LATENCYTOP
392 .procname = "latencytop",
393 .data = &latencytop_enabled,
394 .maxlen = sizeof(int),
396 .proc_handler = &proc_dointvec,
399 #ifdef CONFIG_BLK_DEV_INITRD
401 .ctl_name = KERN_REALROOTDEV,
402 .procname = "real-root-dev",
403 .data = &real_root_dev,
404 .maxlen = sizeof(int),
406 .proc_handler = &proc_dointvec,
410 .ctl_name = CTL_UNNUMBERED,
411 .procname = "print-fatal-signals",
412 .data = &print_fatal_signals,
413 .maxlen = sizeof(int),
415 .proc_handler = &proc_dointvec,
419 .ctl_name = KERN_SPARC_REBOOT,
420 .procname = "reboot-cmd",
421 .data = reboot_command,
424 .proc_handler = &proc_dostring,
425 .strategy = &sysctl_string,
428 .ctl_name = KERN_SPARC_STOP_A,
429 .procname = "stop-a",
430 .data = &stop_a_enabled,
431 .maxlen = sizeof (int),
433 .proc_handler = &proc_dointvec,
436 .ctl_name = KERN_SPARC_SCONS_PWROFF,
437 .procname = "scons-poweroff",
438 .data = &scons_pwroff,
439 .maxlen = sizeof (int),
441 .proc_handler = &proc_dointvec,
446 .ctl_name = KERN_HPPA_PWRSW,
447 .procname = "soft-power",
448 .data = &pwrsw_enabled,
449 .maxlen = sizeof (int),
451 .proc_handler = &proc_dointvec,
454 .ctl_name = KERN_HPPA_UNALIGNED,
455 .procname = "unaligned-trap",
456 .data = &unaligned_enabled,
457 .maxlen = sizeof (int),
459 .proc_handler = &proc_dointvec,
463 .ctl_name = KERN_CTLALTDEL,
464 .procname = "ctrl-alt-del",
466 .maxlen = sizeof(int),
468 .proc_handler = &proc_dointvec,
472 .ctl_name = CTL_UNNUMBERED,
473 .procname = "ftrace_enabled",
474 .data = &ftrace_enabled,
475 .maxlen = sizeof(int),
477 .proc_handler = &ftrace_enable_sysctl,
480 #ifdef CONFIG_MODULES
482 .ctl_name = KERN_MODPROBE,
483 .procname = "modprobe",
484 .data = &modprobe_path,
485 .maxlen = KMOD_PATH_LEN,
487 .proc_handler = &proc_dostring,
488 .strategy = &sysctl_string,
491 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
493 .ctl_name = KERN_HOTPLUG,
494 .procname = "hotplug",
495 .data = &uevent_helper,
496 .maxlen = UEVENT_HELPER_PATH_LEN,
498 .proc_handler = &proc_dostring,
499 .strategy = &sysctl_string,
502 #ifdef CONFIG_CHR_DEV_SG
504 .ctl_name = KERN_SG_BIG_BUFF,
505 .procname = "sg-big-buff",
506 .data = &sg_big_buff,
507 .maxlen = sizeof (int),
509 .proc_handler = &proc_dointvec,
512 #ifdef CONFIG_BSD_PROCESS_ACCT
514 .ctl_name = KERN_ACCT,
517 .maxlen = 3*sizeof(int),
519 .proc_handler = &proc_dointvec,
522 #ifdef CONFIG_MAGIC_SYSRQ
524 .ctl_name = KERN_SYSRQ,
526 .data = &__sysrq_enabled,
527 .maxlen = sizeof (int),
529 .proc_handler = &proc_dointvec,
532 #ifdef CONFIG_PROC_SYSCTL
534 .procname = "cad_pid",
536 .maxlen = sizeof (int),
538 .proc_handler = &proc_do_cad_pid,
542 .ctl_name = KERN_MAX_THREADS,
543 .procname = "threads-max",
544 .data = &max_threads,
545 .maxlen = sizeof(int),
547 .proc_handler = &proc_dointvec,
550 .ctl_name = KERN_RANDOM,
551 .procname = "random",
553 .child = random_table,
556 .ctl_name = KERN_OVERFLOWUID,
557 .procname = "overflowuid",
558 .data = &overflowuid,
559 .maxlen = sizeof(int),
561 .proc_handler = &proc_dointvec_minmax,
562 .strategy = &sysctl_intvec,
563 .extra1 = &minolduid,
564 .extra2 = &maxolduid,
567 .ctl_name = KERN_OVERFLOWGID,
568 .procname = "overflowgid",
569 .data = &overflowgid,
570 .maxlen = sizeof(int),
572 .proc_handler = &proc_dointvec_minmax,
573 .strategy = &sysctl_intvec,
574 .extra1 = &minolduid,
575 .extra2 = &maxolduid,
578 #ifdef CONFIG_MATHEMU
580 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
581 .procname = "ieee_emulation_warnings",
582 .data = &sysctl_ieee_emulation_warnings,
583 .maxlen = sizeof(int),
585 .proc_handler = &proc_dointvec,
589 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
590 .procname = "userprocess_debug",
591 .data = &sysctl_userprocess_debug,
592 .maxlen = sizeof(int),
594 .proc_handler = &proc_dointvec,
598 .ctl_name = KERN_PIDMAX,
599 .procname = "pid_max",
601 .maxlen = sizeof (int),
603 .proc_handler = &proc_dointvec_minmax,
604 .strategy = sysctl_intvec,
605 .extra1 = &pid_max_min,
606 .extra2 = &pid_max_max,
609 .ctl_name = KERN_PANIC_ON_OOPS,
610 .procname = "panic_on_oops",
611 .data = &panic_on_oops,
612 .maxlen = sizeof(int),
614 .proc_handler = &proc_dointvec,
616 #if defined CONFIG_PRINTK
618 .ctl_name = KERN_PRINTK,
619 .procname = "printk",
620 .data = &console_loglevel,
621 .maxlen = 4*sizeof(int),
623 .proc_handler = &proc_dointvec,
626 .ctl_name = KERN_PRINTK_RATELIMIT,
627 .procname = "printk_ratelimit",
628 .data = &printk_ratelimit_state.interval,
629 .maxlen = sizeof(int),
631 .proc_handler = &proc_dointvec_jiffies,
632 .strategy = &sysctl_jiffies,
635 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
636 .procname = "printk_ratelimit_burst",
637 .data = &printk_ratelimit_state.burst,
638 .maxlen = sizeof(int),
640 .proc_handler = &proc_dointvec,
644 .ctl_name = KERN_NGROUPS_MAX,
645 .procname = "ngroups_max",
646 .data = &ngroups_max,
647 .maxlen = sizeof (int),
649 .proc_handler = &proc_dointvec,
651 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
653 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
654 .procname = "unknown_nmi_panic",
655 .data = &unknown_nmi_panic,
656 .maxlen = sizeof (int),
658 .proc_handler = &proc_dointvec,
661 .procname = "nmi_watchdog",
662 .data = &nmi_watchdog_enabled,
663 .maxlen = sizeof (int),
665 .proc_handler = &proc_nmi_enabled,
668 #if defined(CONFIG_X86)
670 .ctl_name = KERN_PANIC_ON_NMI,
671 .procname = "panic_on_unrecovered_nmi",
672 .data = &panic_on_unrecovered_nmi,
673 .maxlen = sizeof(int),
675 .proc_handler = &proc_dointvec,
678 .ctl_name = KERN_BOOTLOADER_TYPE,
679 .procname = "bootloader_type",
680 .data = &bootloader_type,
681 .maxlen = sizeof (int),
683 .proc_handler = &proc_dointvec,
686 .ctl_name = CTL_UNNUMBERED,
687 .procname = "kstack_depth_to_print",
688 .data = &kstack_depth_to_print,
689 .maxlen = sizeof(int),
691 .proc_handler = &proc_dointvec,
694 .ctl_name = CTL_UNNUMBERED,
695 .procname = "io_delay_type",
696 .data = &io_delay_type,
697 .maxlen = sizeof(int),
699 .proc_handler = &proc_dointvec,
702 #if defined(CONFIG_MMU)
704 .ctl_name = KERN_RANDOMIZE,
705 .procname = "randomize_va_space",
706 .data = &randomize_va_space,
707 .maxlen = sizeof(int),
709 .proc_handler = &proc_dointvec,
712 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
714 .ctl_name = KERN_SPIN_RETRY,
715 .procname = "spin_retry",
717 .maxlen = sizeof (int),
719 .proc_handler = &proc_dointvec,
722 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
724 .procname = "acpi_video_flags",
725 .data = &acpi_realmode_flags,
726 .maxlen = sizeof (unsigned long),
728 .proc_handler = &proc_doulongvec_minmax,
733 .ctl_name = KERN_IA64_UNALIGNED,
734 .procname = "ignore-unaligned-usertrap",
735 .data = &no_unaligned_warning,
736 .maxlen = sizeof (int),
738 .proc_handler = &proc_dointvec,
741 #ifdef CONFIG_DETECT_SOFTLOCKUP
743 .ctl_name = CTL_UNNUMBERED,
744 .procname = "softlockup_panic",
745 .data = &softlockup_panic,
746 .maxlen = sizeof(int),
748 .proc_handler = &proc_dointvec_minmax,
749 .strategy = &sysctl_intvec,
754 .ctl_name = CTL_UNNUMBERED,
755 .procname = "softlockup_thresh",
756 .data = &softlockup_thresh,
757 .maxlen = sizeof(int),
759 .proc_handler = &proc_dointvec_minmax,
760 .strategy = &sysctl_intvec,
765 .ctl_name = CTL_UNNUMBERED,
766 .procname = "hung_task_check_count",
767 .data = &sysctl_hung_task_check_count,
768 .maxlen = sizeof(unsigned long),
770 .proc_handler = &proc_doulongvec_minmax,
771 .strategy = &sysctl_intvec,
774 .ctl_name = CTL_UNNUMBERED,
775 .procname = "hung_task_timeout_secs",
776 .data = &sysctl_hung_task_timeout_secs,
777 .maxlen = sizeof(unsigned long),
779 .proc_handler = &proc_doulongvec_minmax,
780 .strategy = &sysctl_intvec,
783 .ctl_name = CTL_UNNUMBERED,
784 .procname = "hung_task_warnings",
785 .data = &sysctl_hung_task_warnings,
786 .maxlen = sizeof(unsigned long),
788 .proc_handler = &proc_doulongvec_minmax,
789 .strategy = &sysctl_intvec,
794 .ctl_name = KERN_COMPAT_LOG,
795 .procname = "compat-log",
797 .maxlen = sizeof (int),
799 .proc_handler = &proc_dointvec,
802 #ifdef CONFIG_RT_MUTEXES
804 .ctl_name = KERN_MAX_LOCK_DEPTH,
805 .procname = "max_lock_depth",
806 .data = &max_lock_depth,
807 .maxlen = sizeof(int),
809 .proc_handler = &proc_dointvec,
812 #ifdef CONFIG_PROC_FS
814 .ctl_name = CTL_UNNUMBERED,
815 .procname = "maps_protect",
816 .data = &maps_protect,
817 .maxlen = sizeof(int),
819 .proc_handler = &proc_dointvec,
823 .ctl_name = CTL_UNNUMBERED,
824 .procname = "poweroff_cmd",
825 .data = &poweroff_cmd,
826 .maxlen = POWEROFF_CMD_PATH_LEN,
828 .proc_handler = &proc_dostring,
829 .strategy = &sysctl_string,
833 .ctl_name = CTL_UNNUMBERED,
836 .child = key_sysctls,
839 #ifdef CONFIG_RCU_TORTURE_TEST
841 .ctl_name = CTL_UNNUMBERED,
842 .procname = "rcutorture_runnable",
843 .data = &rcutorture_runnable,
844 .maxlen = sizeof(int),
846 .proc_handler = &proc_dointvec,
850 * NOTE: do not add new entries to this table unless you have read
851 * Documentation/sysctl/ctl_unnumbered.txt
856 static struct ctl_table vm_table[] = {
858 .ctl_name = VM_OVERCOMMIT_MEMORY,
859 .procname = "overcommit_memory",
860 .data = &sysctl_overcommit_memory,
861 .maxlen = sizeof(sysctl_overcommit_memory),
863 .proc_handler = &proc_dointvec,
866 .ctl_name = VM_PANIC_ON_OOM,
867 .procname = "panic_on_oom",
868 .data = &sysctl_panic_on_oom,
869 .maxlen = sizeof(sysctl_panic_on_oom),
871 .proc_handler = &proc_dointvec,
874 .ctl_name = CTL_UNNUMBERED,
875 .procname = "oom_kill_allocating_task",
876 .data = &sysctl_oom_kill_allocating_task,
877 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
879 .proc_handler = &proc_dointvec,
882 .ctl_name = CTL_UNNUMBERED,
883 .procname = "oom_dump_tasks",
884 .data = &sysctl_oom_dump_tasks,
885 .maxlen = sizeof(sysctl_oom_dump_tasks),
887 .proc_handler = &proc_dointvec,
890 .ctl_name = VM_OVERCOMMIT_RATIO,
891 .procname = "overcommit_ratio",
892 .data = &sysctl_overcommit_ratio,
893 .maxlen = sizeof(sysctl_overcommit_ratio),
895 .proc_handler = &proc_dointvec,
898 .ctl_name = VM_PAGE_CLUSTER,
899 .procname = "page-cluster",
900 .data = &page_cluster,
901 .maxlen = sizeof(int),
903 .proc_handler = &proc_dointvec,
906 .ctl_name = VM_DIRTY_BACKGROUND,
907 .procname = "dirty_background_ratio",
908 .data = &dirty_background_ratio,
909 .maxlen = sizeof(dirty_background_ratio),
911 .proc_handler = &proc_dointvec_minmax,
912 .strategy = &sysctl_intvec,
914 .extra2 = &one_hundred,
917 .ctl_name = VM_DIRTY_RATIO,
918 .procname = "dirty_ratio",
919 .data = &vm_dirty_ratio,
920 .maxlen = sizeof(vm_dirty_ratio),
922 .proc_handler = &dirty_ratio_handler,
923 .strategy = &sysctl_intvec,
925 .extra2 = &one_hundred,
928 .procname = "dirty_writeback_centisecs",
929 .data = &dirty_writeback_interval,
930 .maxlen = sizeof(dirty_writeback_interval),
932 .proc_handler = &dirty_writeback_centisecs_handler,
935 .procname = "dirty_expire_centisecs",
936 .data = &dirty_expire_interval,
937 .maxlen = sizeof(dirty_expire_interval),
939 .proc_handler = &proc_dointvec_userhz_jiffies,
942 .ctl_name = VM_NR_PDFLUSH_THREADS,
943 .procname = "nr_pdflush_threads",
944 .data = &nr_pdflush_threads,
945 .maxlen = sizeof nr_pdflush_threads,
946 .mode = 0444 /* read-only*/,
947 .proc_handler = &proc_dointvec,
950 .ctl_name = VM_SWAPPINESS,
951 .procname = "swappiness",
952 .data = &vm_swappiness,
953 .maxlen = sizeof(vm_swappiness),
955 .proc_handler = &proc_dointvec_minmax,
956 .strategy = &sysctl_intvec,
958 .extra2 = &one_hundred,
960 #ifdef CONFIG_HUGETLB_PAGE
962 .procname = "nr_hugepages",
964 .maxlen = sizeof(unsigned long),
966 .proc_handler = &hugetlb_sysctl_handler,
967 .extra1 = (void *)&hugetlb_zero,
968 .extra2 = (void *)&hugetlb_infinity,
971 .ctl_name = VM_HUGETLB_GROUP,
972 .procname = "hugetlb_shm_group",
973 .data = &sysctl_hugetlb_shm_group,
974 .maxlen = sizeof(gid_t),
976 .proc_handler = &proc_dointvec,
979 .ctl_name = CTL_UNNUMBERED,
980 .procname = "hugepages_treat_as_movable",
981 .data = &hugepages_treat_as_movable,
982 .maxlen = sizeof(int),
984 .proc_handler = &hugetlb_treat_movable_handler,
987 .ctl_name = CTL_UNNUMBERED,
988 .procname = "nr_overcommit_hugepages",
990 .maxlen = sizeof(unsigned long),
992 .proc_handler = &hugetlb_overcommit_handler,
993 .extra1 = (void *)&hugetlb_zero,
994 .extra2 = (void *)&hugetlb_infinity,
998 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
999 .procname = "lowmem_reserve_ratio",
1000 .data = &sysctl_lowmem_reserve_ratio,
1001 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1003 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1004 .strategy = &sysctl_intvec,
1007 .ctl_name = VM_DROP_PAGECACHE,
1008 .procname = "drop_caches",
1009 .data = &sysctl_drop_caches,
1010 .maxlen = sizeof(int),
1012 .proc_handler = drop_caches_sysctl_handler,
1013 .strategy = &sysctl_intvec,
1016 .ctl_name = VM_MIN_FREE_KBYTES,
1017 .procname = "min_free_kbytes",
1018 .data = &min_free_kbytes,
1019 .maxlen = sizeof(min_free_kbytes),
1021 .proc_handler = &min_free_kbytes_sysctl_handler,
1022 .strategy = &sysctl_intvec,
1026 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1027 .procname = "percpu_pagelist_fraction",
1028 .data = &percpu_pagelist_fraction,
1029 .maxlen = sizeof(percpu_pagelist_fraction),
1031 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1032 .strategy = &sysctl_intvec,
1033 .extra1 = &min_percpu_pagelist_fract,
1037 .ctl_name = VM_MAX_MAP_COUNT,
1038 .procname = "max_map_count",
1039 .data = &sysctl_max_map_count,
1040 .maxlen = sizeof(sysctl_max_map_count),
1042 .proc_handler = &proc_dointvec
1046 .ctl_name = VM_LAPTOP_MODE,
1047 .procname = "laptop_mode",
1048 .data = &laptop_mode,
1049 .maxlen = sizeof(laptop_mode),
1051 .proc_handler = &proc_dointvec_jiffies,
1052 .strategy = &sysctl_jiffies,
1055 .ctl_name = VM_BLOCK_DUMP,
1056 .procname = "block_dump",
1057 .data = &block_dump,
1058 .maxlen = sizeof(block_dump),
1060 .proc_handler = &proc_dointvec,
1061 .strategy = &sysctl_intvec,
1065 .ctl_name = VM_VFS_CACHE_PRESSURE,
1066 .procname = "vfs_cache_pressure",
1067 .data = &sysctl_vfs_cache_pressure,
1068 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1070 .proc_handler = &proc_dointvec,
1071 .strategy = &sysctl_intvec,
1074 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1076 .ctl_name = VM_LEGACY_VA_LAYOUT,
1077 .procname = "legacy_va_layout",
1078 .data = &sysctl_legacy_va_layout,
1079 .maxlen = sizeof(sysctl_legacy_va_layout),
1081 .proc_handler = &proc_dointvec,
1082 .strategy = &sysctl_intvec,
1088 .ctl_name = VM_ZONE_RECLAIM_MODE,
1089 .procname = "zone_reclaim_mode",
1090 .data = &zone_reclaim_mode,
1091 .maxlen = sizeof(zone_reclaim_mode),
1093 .proc_handler = &proc_dointvec,
1094 .strategy = &sysctl_intvec,
1098 .ctl_name = VM_MIN_UNMAPPED,
1099 .procname = "min_unmapped_ratio",
1100 .data = &sysctl_min_unmapped_ratio,
1101 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1103 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1104 .strategy = &sysctl_intvec,
1106 .extra2 = &one_hundred,
1109 .ctl_name = VM_MIN_SLAB,
1110 .procname = "min_slab_ratio",
1111 .data = &sysctl_min_slab_ratio,
1112 .maxlen = sizeof(sysctl_min_slab_ratio),
1114 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1115 .strategy = &sysctl_intvec,
1117 .extra2 = &one_hundred,
1122 .ctl_name = CTL_UNNUMBERED,
1123 .procname = "stat_interval",
1124 .data = &sysctl_stat_interval,
1125 .maxlen = sizeof(sysctl_stat_interval),
1127 .proc_handler = &proc_dointvec_jiffies,
1128 .strategy = &sysctl_jiffies,
1131 #ifdef CONFIG_SECURITY
1133 .ctl_name = CTL_UNNUMBERED,
1134 .procname = "mmap_min_addr",
1135 .data = &mmap_min_addr,
1136 .maxlen = sizeof(unsigned long),
1138 .proc_handler = &proc_doulongvec_minmax,
1143 .ctl_name = CTL_UNNUMBERED,
1144 .procname = "numa_zonelist_order",
1145 .data = &numa_zonelist_order,
1146 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1148 .proc_handler = &numa_zonelist_order_handler,
1149 .strategy = &sysctl_string,
1152 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1153 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1155 .ctl_name = VM_VDSO_ENABLED,
1156 .procname = "vdso_enabled",
1157 .data = &vdso_enabled,
1158 .maxlen = sizeof(vdso_enabled),
1160 .proc_handler = &proc_dointvec,
1161 .strategy = &sysctl_intvec,
1165 #ifdef CONFIG_HIGHMEM
1167 .ctl_name = CTL_UNNUMBERED,
1168 .procname = "highmem_is_dirtyable",
1169 .data = &vm_highmem_is_dirtyable,
1170 .maxlen = sizeof(vm_highmem_is_dirtyable),
1172 .proc_handler = &proc_dointvec_minmax,
1173 .strategy = &sysctl_intvec,
1179 * NOTE: do not add new entries to this table unless you have read
1180 * Documentation/sysctl/ctl_unnumbered.txt
1185 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1186 static struct ctl_table binfmt_misc_table[] = {
1191 static struct ctl_table fs_table[] = {
1193 .ctl_name = FS_NRINODE,
1194 .procname = "inode-nr",
1195 .data = &inodes_stat,
1196 .maxlen = 2*sizeof(int),
1198 .proc_handler = &proc_dointvec,
1201 .ctl_name = FS_STATINODE,
1202 .procname = "inode-state",
1203 .data = &inodes_stat,
1204 .maxlen = 7*sizeof(int),
1206 .proc_handler = &proc_dointvec,
1209 .procname = "file-nr",
1210 .data = &files_stat,
1211 .maxlen = 3*sizeof(int),
1213 .proc_handler = &proc_nr_files,
1216 .ctl_name = FS_MAXFILE,
1217 .procname = "file-max",
1218 .data = &files_stat.max_files,
1219 .maxlen = sizeof(int),
1221 .proc_handler = &proc_dointvec,
1224 .ctl_name = CTL_UNNUMBERED,
1225 .procname = "nr_open",
1226 .data = &sysctl_nr_open,
1227 .maxlen = sizeof(int),
1229 .proc_handler = &proc_dointvec_minmax,
1230 .extra1 = &sysctl_nr_open_min,
1231 .extra2 = &sysctl_nr_open_max,
1234 .ctl_name = FS_DENTRY,
1235 .procname = "dentry-state",
1236 .data = &dentry_stat,
1237 .maxlen = 6*sizeof(int),
1239 .proc_handler = &proc_dointvec,
1242 .ctl_name = FS_OVERFLOWUID,
1243 .procname = "overflowuid",
1244 .data = &fs_overflowuid,
1245 .maxlen = sizeof(int),
1247 .proc_handler = &proc_dointvec_minmax,
1248 .strategy = &sysctl_intvec,
1249 .extra1 = &minolduid,
1250 .extra2 = &maxolduid,
1253 .ctl_name = FS_OVERFLOWGID,
1254 .procname = "overflowgid",
1255 .data = &fs_overflowgid,
1256 .maxlen = sizeof(int),
1258 .proc_handler = &proc_dointvec_minmax,
1259 .strategy = &sysctl_intvec,
1260 .extra1 = &minolduid,
1261 .extra2 = &maxolduid,
1264 .ctl_name = FS_LEASES,
1265 .procname = "leases-enable",
1266 .data = &leases_enable,
1267 .maxlen = sizeof(int),
1269 .proc_handler = &proc_dointvec,
1271 #ifdef CONFIG_DNOTIFY
1273 .ctl_name = FS_DIR_NOTIFY,
1274 .procname = "dir-notify-enable",
1275 .data = &dir_notify_enable,
1276 .maxlen = sizeof(int),
1278 .proc_handler = &proc_dointvec,
1283 .ctl_name = FS_LEASE_TIME,
1284 .procname = "lease-break-time",
1285 .data = &lease_break_time,
1286 .maxlen = sizeof(int),
1288 .proc_handler = &proc_dointvec_minmax,
1289 .strategy = &sysctl_intvec,
1294 .procname = "aio-nr",
1296 .maxlen = sizeof(aio_nr),
1298 .proc_handler = &proc_doulongvec_minmax,
1301 .procname = "aio-max-nr",
1302 .data = &aio_max_nr,
1303 .maxlen = sizeof(aio_max_nr),
1305 .proc_handler = &proc_doulongvec_minmax,
1307 #ifdef CONFIG_INOTIFY_USER
1309 .ctl_name = FS_INOTIFY,
1310 .procname = "inotify",
1312 .child = inotify_table,
1317 .ctl_name = KERN_SETUID_DUMPABLE,
1318 .procname = "suid_dumpable",
1319 .data = &suid_dumpable,
1320 .maxlen = sizeof(int),
1322 .proc_handler = &proc_dointvec,
1324 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1326 .ctl_name = CTL_UNNUMBERED,
1327 .procname = "binfmt_misc",
1329 .child = binfmt_misc_table,
1333 * NOTE: do not add new entries to this table unless you have read
1334 * Documentation/sysctl/ctl_unnumbered.txt
1339 static struct ctl_table debug_table[] = {
1340 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1342 .ctl_name = CTL_UNNUMBERED,
1343 .procname = "exception-trace",
1344 .data = &show_unhandled_signals,
1345 .maxlen = sizeof(int),
1347 .proc_handler = proc_dointvec
1353 static struct ctl_table dev_table[] = {
1357 static DEFINE_SPINLOCK(sysctl_lock);
1359 /* called under sysctl_lock */
1360 static int use_table(struct ctl_table_header *p)
1362 if (unlikely(p->unregistering))
1368 /* called under sysctl_lock */
1369 static void unuse_table(struct ctl_table_header *p)
1372 if (unlikely(p->unregistering))
1373 complete(p->unregistering);
1376 /* called under sysctl_lock, will reacquire if has to wait */
1377 static void start_unregistering(struct ctl_table_header *p)
1380 * if p->used is 0, nobody will ever touch that entry again;
1381 * we'll eliminate all paths to it before dropping sysctl_lock
1383 if (unlikely(p->used)) {
1384 struct completion wait;
1385 init_completion(&wait);
1386 p->unregistering = &wait;
1387 spin_unlock(&sysctl_lock);
1388 wait_for_completion(&wait);
1389 spin_lock(&sysctl_lock);
1391 /* anything non-NULL; we'll never dereference it */
1392 p->unregistering = ERR_PTR(-EINVAL);
1395 * do not remove from the list until nobody holds it; walking the
1396 * list in do_sysctl() relies on that.
1398 list_del_init(&p->ctl_entry);
1401 void sysctl_head_get(struct ctl_table_header *head)
1403 spin_lock(&sysctl_lock);
1405 spin_unlock(&sysctl_lock);
1408 void sysctl_head_put(struct ctl_table_header *head)
1410 spin_lock(&sysctl_lock);
1413 spin_unlock(&sysctl_lock);
1416 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1420 spin_lock(&sysctl_lock);
1421 if (!use_table(head))
1422 head = ERR_PTR(-ENOENT);
1423 spin_unlock(&sysctl_lock);
1427 void sysctl_head_finish(struct ctl_table_header *head)
1431 spin_lock(&sysctl_lock);
1433 spin_unlock(&sysctl_lock);
1436 static struct ctl_table_set *
1437 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1439 struct ctl_table_set *set = &root->default_set;
1441 set = root->lookup(root, namespaces);
1445 static struct list_head *
1446 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1448 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1452 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1453 struct ctl_table_header *prev)
1455 struct ctl_table_root *root;
1456 struct list_head *header_list;
1457 struct ctl_table_header *head;
1458 struct list_head *tmp;
1460 spin_lock(&sysctl_lock);
1463 tmp = &prev->ctl_entry;
1467 tmp = &root_table_header.ctl_entry;
1469 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1471 if (!use_table(head))
1473 spin_unlock(&sysctl_lock);
1478 header_list = lookup_header_list(root, namespaces);
1479 if (tmp != header_list)
1483 root = list_entry(root->root_list.next,
1484 struct ctl_table_root, root_list);
1485 if (root == &sysctl_table_root)
1487 header_list = lookup_header_list(root, namespaces);
1488 } while (list_empty(header_list));
1489 tmp = header_list->next;
1492 spin_unlock(&sysctl_lock);
1496 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1498 return __sysctl_head_next(current->nsproxy, prev);
1501 void register_sysctl_root(struct ctl_table_root *root)
1503 spin_lock(&sysctl_lock);
1504 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1505 spin_unlock(&sysctl_lock);
1508 #ifdef CONFIG_SYSCTL_SYSCALL
1509 /* Perform the actual read/write of a sysctl table entry. */
1510 static int do_sysctl_strategy(struct ctl_table_root *root,
1511 struct ctl_table *table,
1512 int __user *name, int nlen,
1513 void __user *oldval, size_t __user *oldlenp,
1514 void __user *newval, size_t newlen)
1522 if (sysctl_perm(root, table, op))
1525 if (table->strategy) {
1526 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1534 /* If there is no strategy routine, or if the strategy returns
1535 * zero, proceed with automatic r/w */
1536 if (table->data && table->maxlen) {
1537 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1545 static int parse_table(int __user *name, int nlen,
1546 void __user *oldval, size_t __user *oldlenp,
1547 void __user *newval, size_t newlen,
1548 struct ctl_table_root *root,
1549 struct ctl_table *table)
1555 if (get_user(n, name))
1557 for ( ; table->ctl_name || table->procname; table++) {
1558 if (!table->ctl_name)
1560 if (n == table->ctl_name) {
1563 if (sysctl_perm(root, table, 001))
1567 table = table->child;
1570 error = do_sysctl_strategy(root, table, name, nlen,
1579 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1580 void __user *newval, size_t newlen)
1582 struct ctl_table_header *head;
1583 int error = -ENOTDIR;
1585 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1589 if (!oldlenp || get_user(old_len, oldlenp))
1593 for (head = sysctl_head_next(NULL); head;
1594 head = sysctl_head_next(head)) {
1595 error = parse_table(name, nlen, oldval, oldlenp,
1597 head->root, head->ctl_table);
1598 if (error != -ENOTDIR) {
1599 sysctl_head_finish(head);
1606 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1608 struct __sysctl_args tmp;
1611 if (copy_from_user(&tmp, args, sizeof(tmp)))
1614 error = deprecated_sysctl_warning(&tmp);
1619 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1620 tmp.newval, tmp.newlen);
1625 #endif /* CONFIG_SYSCTL_SYSCALL */
1628 * sysctl_perm does NOT grant the superuser all rights automatically, because
1629 * some sysctl variables are readonly even to root.
1632 static int test_perm(int mode, int op)
1636 else if (in_egroup_p(0))
1638 if ((mode & op & 0007) == op)
1643 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1648 error = security_sysctl(table, op);
1652 if (root->permissions)
1653 mode = root->permissions(root, current->nsproxy, table);
1657 return test_perm(mode, op);
1660 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1662 for (; table->ctl_name || table->procname; table++) {
1663 table->parent = parent;
1665 sysctl_set_parent(table, table->child);
1669 static __init int sysctl_init(void)
1671 sysctl_set_parent(NULL, root_table);
1672 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1675 err = sysctl_check_table(current->nsproxy, root_table);
1681 core_initcall(sysctl_init);
1683 static int is_branch_in(struct ctl_table *branch, struct ctl_table *table)
1685 struct ctl_table *p;
1686 const char *s = branch->procname;
1688 /* branch should have named subdirectory as its first element */
1689 if (!s || !branch->child)
1692 /* ... and nothing else */
1693 if (branch[1].procname || branch[1].ctl_name)
1696 /* table should contain subdirectory with the same name */
1697 for (p = table; p->procname || p->ctl_name; p++) {
1700 if (p->procname && strcmp(p->procname, s) == 0)
1706 /* see if attaching q to p would be an improvement */
1707 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1709 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1711 int not_in_parent = !p->attached_by;
1713 while (is_branch_in(by, to)) {
1714 if (by == q->attached_by)
1716 if (to == p->attached_by)
1722 if (is_better && not_in_parent) {
1723 q->attached_by = by;
1724 q->attached_to = to;
1730 * __register_sysctl_paths - register a sysctl hierarchy
1731 * @root: List of sysctl headers to register on
1732 * @namespaces: Data to compute which lists of sysctl entries are visible
1733 * @path: The path to the directory the sysctl table is in.
1734 * @table: the top-level table structure
1736 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1737 * array. A completely 0 filled entry terminates the table.
1739 * The members of the &struct ctl_table structure are used as follows:
1741 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1742 * must be unique within that level of sysctl
1744 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1745 * enter a sysctl file
1747 * data - a pointer to data for use by proc_handler
1749 * maxlen - the maximum size in bytes of the data
1751 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1753 * child - a pointer to the child sysctl table if this entry is a directory, or
1756 * proc_handler - the text handler routine (described below)
1758 * strategy - the strategy routine (described below)
1760 * de - for internal use by the sysctl routines
1762 * extra1, extra2 - extra pointers usable by the proc handler routines
1764 * Leaf nodes in the sysctl tree will be represented by a single file
1765 * under /proc; non-leaf nodes will be represented by directories.
1767 * sysctl(2) can automatically manage read and write requests through
1768 * the sysctl table. The data and maxlen fields of the ctl_table
1769 * struct enable minimal validation of the values being written to be
1770 * performed, and the mode field allows minimal authentication.
1772 * More sophisticated management can be enabled by the provision of a
1773 * strategy routine with the table entry. This will be called before
1774 * any automatic read or write of the data is performed.
1776 * The strategy routine may return
1778 * < 0 - Error occurred (error is passed to user process)
1780 * 0 - OK - proceed with automatic read or write.
1782 * > 0 - OK - read or write has been done by the strategy routine, so
1783 * return immediately.
1785 * There must be a proc_handler routine for any terminal nodes
1786 * mirrored under /proc/sys (non-terminals are handled by a built-in
1787 * directory handler). Several default handlers are available to
1788 * cover common cases -
1790 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1791 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1792 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1794 * It is the handler's job to read the input buffer from user memory
1795 * and process it. The handler should return 0 on success.
1797 * This routine returns %NULL on a failure to register, and a pointer
1798 * to the table header on success.
1800 struct ctl_table_header *__register_sysctl_paths(
1801 struct ctl_table_root *root,
1802 struct nsproxy *namespaces,
1803 const struct ctl_path *path, struct ctl_table *table)
1805 struct ctl_table_header *header;
1806 struct ctl_table *new, **prevp;
1807 unsigned int n, npath;
1808 struct ctl_table_set *set;
1810 /* Count the path components */
1811 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1815 * For each path component, allocate a 2-element ctl_table array.
1816 * The first array element will be filled with the sysctl entry
1817 * for this, the second will be the sentinel (ctl_name == 0).
1819 * We allocate everything in one go so that we don't have to
1820 * worry about freeing additional memory in unregister_sysctl_table.
1822 header = kzalloc(sizeof(struct ctl_table_header) +
1823 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1827 new = (struct ctl_table *) (header + 1);
1829 /* Now connect the dots */
1830 prevp = &header->ctl_table;
1831 for (n = 0; n < npath; ++n, ++path) {
1832 /* Copy the procname */
1833 new->procname = path->procname;
1834 new->ctl_name = path->ctl_name;
1838 prevp = &new->child;
1843 header->ctl_table_arg = table;
1845 INIT_LIST_HEAD(&header->ctl_entry);
1847 header->unregistering = NULL;
1848 header->root = root;
1849 sysctl_set_parent(NULL, header->ctl_table);
1851 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1852 if (sysctl_check_table(namespaces, header->ctl_table)) {
1857 spin_lock(&sysctl_lock);
1858 header->set = lookup_header_set(root, namespaces);
1859 header->attached_by = header->ctl_table;
1860 header->attached_to = root_table;
1861 header->parent = &root_table_header;
1862 for (set = header->set; set; set = set->parent) {
1863 struct ctl_table_header *p;
1864 list_for_each_entry(p, &set->list, ctl_entry) {
1865 if (p->unregistering)
1867 try_attach(p, header);
1870 header->parent->count++;
1871 list_add_tail(&header->ctl_entry, &header->set->list);
1872 spin_unlock(&sysctl_lock);
1878 * register_sysctl_table_path - register a sysctl table hierarchy
1879 * @path: The path to the directory the sysctl table is in.
1880 * @table: the top-level table structure
1882 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1883 * array. A completely 0 filled entry terminates the table.
1885 * See __register_sysctl_paths for more details.
1887 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1888 struct ctl_table *table)
1890 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1895 * register_sysctl_table - register a sysctl table hierarchy
1896 * @table: the top-level table structure
1898 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1899 * array. A completely 0 filled entry terminates the table.
1901 * See register_sysctl_paths for more details.
1903 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1905 static const struct ctl_path null_path[] = { {} };
1907 return register_sysctl_paths(null_path, table);
1911 * unregister_sysctl_table - unregister a sysctl table hierarchy
1912 * @header: the header returned from register_sysctl_table
1914 * Unregisters the sysctl table and all children. proc entries may not
1915 * actually be removed until they are no longer used by anyone.
1917 void unregister_sysctl_table(struct ctl_table_header * header)
1924 spin_lock(&sysctl_lock);
1925 start_unregistering(header);
1926 if (!--header->parent->count) {
1928 kfree(header->parent);
1930 if (!--header->count)
1932 spin_unlock(&sysctl_lock);
1935 void setup_sysctl_set(struct ctl_table_set *p,
1936 struct ctl_table_set *parent,
1937 int (*is_seen)(struct ctl_table_set *))
1939 INIT_LIST_HEAD(&p->list);
1940 p->parent = parent ? parent : &sysctl_table_root.default_set;
1941 p->is_seen = is_seen;
1944 #else /* !CONFIG_SYSCTL */
1945 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1950 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1951 struct ctl_table *table)
1956 void unregister_sysctl_table(struct ctl_table_header * table)
1960 void setup_sysctl_set(struct ctl_table_set *p,
1961 struct ctl_table_set *parent,
1962 int (*is_seen)(struct ctl_table_set *))
1966 void sysctl_head_put(struct ctl_table_header *head)
1970 #endif /* CONFIG_SYSCTL */
1976 #ifdef CONFIG_PROC_SYSCTL
1978 static int _proc_do_string(void* data, int maxlen, int write,
1979 struct file *filp, void __user *buffer,
1980 size_t *lenp, loff_t *ppos)
1986 if (!data || !maxlen || !*lenp) {
1994 while (len < *lenp) {
1995 if (get_user(c, p++))
1997 if (c == 0 || c == '\n')
2003 if(copy_from_user(data, buffer, len))
2005 ((char *) data)[len] = 0;
2023 if(copy_to_user(buffer, data, len))
2026 if(put_user('\n', ((char __user *) buffer) + len))
2037 * proc_dostring - read a string sysctl
2038 * @table: the sysctl table
2039 * @write: %TRUE if this is a write to the sysctl file
2040 * @filp: the file structure
2041 * @buffer: the user buffer
2042 * @lenp: the size of the user buffer
2043 * @ppos: file position
2045 * Reads/writes a string from/to the user buffer. If the kernel
2046 * buffer provided is not large enough to hold the string, the
2047 * string is truncated. The copied string is %NULL-terminated.
2048 * If the string is being read by the user process, it is copied
2049 * and a newline '\n' is added. It is truncated if the buffer is
2052 * Returns 0 on success.
2054 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2055 void __user *buffer, size_t *lenp, loff_t *ppos)
2057 return _proc_do_string(table->data, table->maxlen, write, filp,
2058 buffer, lenp, ppos);
2062 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2064 int write, void *data)
2067 *valp = *negp ? -*lvalp : *lvalp;
2072 *lvalp = (unsigned long)-val;
2075 *lvalp = (unsigned long)val;
2081 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2082 int write, struct file *filp, void __user *buffer,
2083 size_t *lenp, loff_t *ppos,
2084 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2085 int write, void *data),
2088 #define TMPBUFLEN 21
2089 int *i, vleft, first=1, neg, val;
2093 char buf[TMPBUFLEN], *p;
2094 char __user *s = buffer;
2096 if (!tbl_data || !table->maxlen || !*lenp ||
2097 (*ppos && !write)) {
2102 i = (int *) tbl_data;
2103 vleft = table->maxlen / sizeof(*i);
2107 conv = do_proc_dointvec_conv;
2109 for (; left && vleft--; i++, first=0) {
2124 if (len > sizeof(buf) - 1)
2125 len = sizeof(buf) - 1;
2126 if (copy_from_user(buf, s, len))
2130 if (*p == '-' && left > 1) {
2134 if (*p < '0' || *p > '9')
2137 lval = simple_strtoul(p, &p, 0);
2140 if ((len < left) && *p && !isspace(*p))
2147 if (conv(&neg, &lval, i, 1, data))
2154 if (conv(&neg, &lval, i, 0, data))
2157 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2161 if(copy_to_user(s, buf, len))
2168 if (!write && !first && left) {
2169 if(put_user('\n', s))
2176 if (get_user(c, s++))
2191 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2192 void __user *buffer, size_t *lenp, loff_t *ppos,
2193 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2194 int write, void *data),
2197 return __do_proc_dointvec(table->data, table, write, filp,
2198 buffer, lenp, ppos, conv, data);
2202 * proc_dointvec - read a vector of integers
2203 * @table: the sysctl table
2204 * @write: %TRUE if this is a write to the sysctl file
2205 * @filp: the file structure
2206 * @buffer: the user buffer
2207 * @lenp: the size of the user buffer
2208 * @ppos: file position
2210 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2211 * values from/to the user buffer, treated as an ASCII string.
2213 * Returns 0 on success.
2215 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2216 void __user *buffer, size_t *lenp, loff_t *ppos)
2218 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2226 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2228 int write, void *data)
2230 int op = *(int *)data;
2232 int val = *negp ? -*lvalp : *lvalp;
2234 case OP_SET: *valp = val; break;
2235 case OP_AND: *valp &= val; break;
2236 case OP_OR: *valp |= val; break;
2242 *lvalp = (unsigned long)-val;
2245 *lvalp = (unsigned long)val;
2252 * Taint values can only be increased
2254 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2255 void __user *buffer, size_t *lenp, loff_t *ppos)
2259 if (write && !capable(CAP_SYS_ADMIN))
2263 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2264 do_proc_dointvec_bset_conv,&op);
2267 struct do_proc_dointvec_minmax_conv_param {
2272 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2274 int write, void *data)
2276 struct do_proc_dointvec_minmax_conv_param *param = data;
2278 int val = *negp ? -*lvalp : *lvalp;
2279 if ((param->min && *param->min > val) ||
2280 (param->max && *param->max < val))
2287 *lvalp = (unsigned long)-val;
2290 *lvalp = (unsigned long)val;
2297 * proc_dointvec_minmax - read a vector of integers with min/max values
2298 * @table: the sysctl table
2299 * @write: %TRUE if this is a write to the sysctl file
2300 * @filp: the file structure
2301 * @buffer: the user buffer
2302 * @lenp: the size of the user buffer
2303 * @ppos: file position
2305 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2306 * values from/to the user buffer, treated as an ASCII string.
2308 * This routine will ensure the values are within the range specified by
2309 * table->extra1 (min) and table->extra2 (max).
2311 * Returns 0 on success.
2313 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2314 void __user *buffer, size_t *lenp, loff_t *ppos)
2316 struct do_proc_dointvec_minmax_conv_param param = {
2317 .min = (int *) table->extra1,
2318 .max = (int *) table->extra2,
2320 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2321 do_proc_dointvec_minmax_conv, ¶m);
2324 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2326 void __user *buffer,
2327 size_t *lenp, loff_t *ppos,
2328 unsigned long convmul,
2329 unsigned long convdiv)
2331 #define TMPBUFLEN 21
2332 unsigned long *i, *min, *max, val;
2333 int vleft, first=1, neg;
2335 char buf[TMPBUFLEN], *p;
2336 char __user *s = buffer;
2338 if (!data || !table->maxlen || !*lenp ||
2339 (*ppos && !write)) {
2344 i = (unsigned long *) data;
2345 min = (unsigned long *) table->extra1;
2346 max = (unsigned long *) table->extra2;
2347 vleft = table->maxlen / sizeof(unsigned long);
2350 for (; left && vleft--; i++, min++, max++, first=0) {
2365 if (len > TMPBUFLEN-1)
2367 if (copy_from_user(buf, s, len))
2371 if (*p == '-' && left > 1) {
2375 if (*p < '0' || *p > '9')
2377 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2379 if ((len < left) && *p && !isspace(*p))
2388 if ((min && val < *min) || (max && val > *max))
2395 sprintf(p, "%lu", convdiv * (*i) / convmul);
2399 if(copy_to_user(s, buf, len))
2406 if (!write && !first && left) {
2407 if(put_user('\n', s))
2414 if (get_user(c, s++))
2429 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2431 void __user *buffer,
2432 size_t *lenp, loff_t *ppos,
2433 unsigned long convmul,
2434 unsigned long convdiv)
2436 return __do_proc_doulongvec_minmax(table->data, table, write,
2437 filp, buffer, lenp, ppos, convmul, convdiv);
2441 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2442 * @table: the sysctl table
2443 * @write: %TRUE if this is a write to the sysctl file
2444 * @filp: the file structure
2445 * @buffer: the user buffer
2446 * @lenp: the size of the user buffer
2447 * @ppos: file position
2449 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2450 * values from/to the user buffer, treated as an ASCII string.
2452 * This routine will ensure the values are within the range specified by
2453 * table->extra1 (min) and table->extra2 (max).
2455 * Returns 0 on success.
2457 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2458 void __user *buffer, size_t *lenp, loff_t *ppos)
2460 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2464 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2465 * @table: the sysctl table
2466 * @write: %TRUE if this is a write to the sysctl file
2467 * @filp: the file structure
2468 * @buffer: the user buffer
2469 * @lenp: the size of the user buffer
2470 * @ppos: file position
2472 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2473 * values from/to the user buffer, treated as an ASCII string. The values
2474 * are treated as milliseconds, and converted to jiffies when they are stored.
2476 * This routine will ensure the values are within the range specified by
2477 * table->extra1 (min) and table->extra2 (max).
2479 * Returns 0 on success.
2481 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2483 void __user *buffer,
2484 size_t *lenp, loff_t *ppos)
2486 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2487 lenp, ppos, HZ, 1000l);
2491 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2493 int write, void *data)
2496 if (*lvalp > LONG_MAX / HZ)
2498 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2504 lval = (unsigned long)-val;
2507 lval = (unsigned long)val;
2514 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2516 int write, void *data)
2519 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2521 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2527 lval = (unsigned long)-val;
2530 lval = (unsigned long)val;
2532 *lvalp = jiffies_to_clock_t(lval);
2537 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2539 int write, void *data)
2542 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2548 lval = (unsigned long)-val;
2551 lval = (unsigned long)val;
2553 *lvalp = jiffies_to_msecs(lval);
2559 * proc_dointvec_jiffies - read a vector of integers as seconds
2560 * @table: the sysctl table
2561 * @write: %TRUE if this is a write to the sysctl file
2562 * @filp: the file structure
2563 * @buffer: the user buffer
2564 * @lenp: the size of the user buffer
2565 * @ppos: file position
2567 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2568 * values from/to the user buffer, treated as an ASCII string.
2569 * The values read are assumed to be in seconds, and are converted into
2572 * Returns 0 on success.
2574 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2575 void __user *buffer, size_t *lenp, loff_t *ppos)
2577 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2578 do_proc_dointvec_jiffies_conv,NULL);
2582 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2583 * @table: the sysctl table
2584 * @write: %TRUE if this is a write to the sysctl file
2585 * @filp: the file structure
2586 * @buffer: the user buffer
2587 * @lenp: the size of the user buffer
2588 * @ppos: pointer to the file position
2590 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2591 * values from/to the user buffer, treated as an ASCII string.
2592 * The values read are assumed to be in 1/USER_HZ seconds, and
2593 * are converted into jiffies.
2595 * Returns 0 on success.
2597 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2600 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2601 do_proc_dointvec_userhz_jiffies_conv,NULL);
2605 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2606 * @table: the sysctl table
2607 * @write: %TRUE if this is a write to the sysctl file
2608 * @filp: the file structure
2609 * @buffer: the user buffer
2610 * @lenp: the size of the user buffer
2611 * @ppos: file position
2612 * @ppos: the current position in the file
2614 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2615 * values from/to the user buffer, treated as an ASCII string.
2616 * The values read are assumed to be in 1/1000 seconds, and
2617 * are converted into jiffies.
2619 * Returns 0 on success.
2621 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2624 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2625 do_proc_dointvec_ms_jiffies_conv, NULL);
2628 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2629 void __user *buffer, size_t *lenp, loff_t *ppos)
2631 struct pid *new_pid;
2635 tmp = pid_vnr(cad_pid);
2637 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2638 lenp, ppos, NULL, NULL);
2642 new_pid = find_get_pid(tmp);
2646 put_pid(xchg(&cad_pid, new_pid));
2650 #else /* CONFIG_PROC_FS */
2652 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2653 void __user *buffer, size_t *lenp, loff_t *ppos)
2658 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2659 void __user *buffer, size_t *lenp, loff_t *ppos)
2664 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2665 void __user *buffer, size_t *lenp, loff_t *ppos)
2670 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2671 void __user *buffer, size_t *lenp, loff_t *ppos)
2676 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2677 void __user *buffer, size_t *lenp, loff_t *ppos)
2682 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2683 void __user *buffer, size_t *lenp, loff_t *ppos)
2688 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2689 void __user *buffer, size_t *lenp, loff_t *ppos)
2694 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2696 void __user *buffer,
2697 size_t *lenp, loff_t *ppos)
2703 #endif /* CONFIG_PROC_FS */
2706 #ifdef CONFIG_SYSCTL_SYSCALL
2708 * General sysctl support routines
2711 /* The generic sysctl data routine (used if no strategy routine supplied) */
2712 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2713 void __user *oldval, size_t __user *oldlenp,
2714 void __user *newval, size_t newlen)
2718 /* Get out of I don't have a variable */
2719 if (!table->data || !table->maxlen)
2722 if (oldval && oldlenp) {
2723 if (get_user(len, oldlenp))
2726 if (len > table->maxlen)
2727 len = table->maxlen;
2728 if (copy_to_user(oldval, table->data, len))
2730 if (put_user(len, oldlenp))
2735 if (newval && newlen) {
2736 if (newlen > table->maxlen)
2737 newlen = table->maxlen;
2739 if (copy_from_user(table->data, newval, newlen))
2745 /* The generic string strategy routine: */
2746 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2747 void __user *oldval, size_t __user *oldlenp,
2748 void __user *newval, size_t newlen)
2750 if (!table->data || !table->maxlen)
2753 if (oldval && oldlenp) {
2755 if (get_user(bufsize, oldlenp))
2758 size_t len = strlen(table->data), copied;
2760 /* This shouldn't trigger for a well-formed sysctl */
2761 if (len > table->maxlen)
2762 len = table->maxlen;
2764 /* Copy up to a max of bufsize-1 bytes of the string */
2765 copied = (len >= bufsize) ? bufsize - 1 : len;
2767 if (copy_to_user(oldval, table->data, copied) ||
2768 put_user(0, (char __user *)(oldval + copied)))
2770 if (put_user(len, oldlenp))
2774 if (newval && newlen) {
2775 size_t len = newlen;
2776 if (len > table->maxlen)
2777 len = table->maxlen;
2778 if(copy_from_user(table->data, newval, len))
2780 if (len == table->maxlen)
2782 ((char *) table->data)[len] = 0;
2788 * This function makes sure that all of the integers in the vector
2789 * are between the minimum and maximum values given in the arrays
2790 * table->extra1 and table->extra2, respectively.
2792 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2793 void __user *oldval, size_t __user *oldlenp,
2794 void __user *newval, size_t newlen)
2797 if (newval && newlen) {
2798 int __user *vec = (int __user *) newval;
2799 int *min = (int *) table->extra1;
2800 int *max = (int *) table->extra2;
2804 if (newlen % sizeof(int) != 0)
2807 if (!table->extra1 && !table->extra2)
2810 if (newlen > table->maxlen)
2811 newlen = table->maxlen;
2812 length = newlen / sizeof(int);
2814 for (i = 0; i < length; i++) {
2816 if (get_user(value, vec + i))
2818 if (min && value < min[i])
2820 if (max && value > max[i])
2827 /* Strategy function to convert jiffies to seconds */
2828 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2829 void __user *oldval, size_t __user *oldlenp,
2830 void __user *newval, size_t newlen)
2832 if (oldval && oldlenp) {
2835 if (get_user(olen, oldlenp))
2840 if (olen < sizeof(int))
2843 val = *(int *)(table->data) / HZ;
2844 if (put_user(val, (int __user *)oldval))
2846 if (put_user(sizeof(int), oldlenp))
2850 if (newval && newlen) {
2852 if (newlen != sizeof(int))
2854 if (get_user(new, (int __user *)newval))
2856 *(int *)(table->data) = new*HZ;
2861 /* Strategy function to convert jiffies to seconds */
2862 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2863 void __user *oldval, size_t __user *oldlenp,
2864 void __user *newval, size_t newlen)
2866 if (oldval && oldlenp) {
2869 if (get_user(olen, oldlenp))
2874 if (olen < sizeof(int))
2877 val = jiffies_to_msecs(*(int *)(table->data));
2878 if (put_user(val, (int __user *)oldval))
2880 if (put_user(sizeof(int), oldlenp))
2884 if (newval && newlen) {
2886 if (newlen != sizeof(int))
2888 if (get_user(new, (int __user *)newval))
2890 *(int *)(table->data) = msecs_to_jiffies(new);
2897 #else /* CONFIG_SYSCTL_SYSCALL */
2900 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2902 struct __sysctl_args tmp;
2905 if (copy_from_user(&tmp, args, sizeof(tmp)))
2908 error = deprecated_sysctl_warning(&tmp);
2910 /* If no error reading the parameters then just -ENOSYS ... */
2917 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2918 void __user *oldval, size_t __user *oldlenp,
2919 void __user *newval, size_t newlen)
2924 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2925 void __user *oldval, size_t __user *oldlenp,
2926 void __user *newval, size_t newlen)
2931 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2932 void __user *oldval, size_t __user *oldlenp,
2933 void __user *newval, size_t newlen)
2938 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2939 void __user *oldval, size_t __user *oldlenp,
2940 void __user *newval, size_t newlen)
2945 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2946 void __user *oldval, size_t __user *oldlenp,
2947 void __user *newval, size_t newlen)
2952 #endif /* CONFIG_SYSCTL_SYSCALL */
2954 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2956 static int msg_count;
2957 int name[CTL_MAXNAME];
2960 /* Check args->nlen. */
2961 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2964 /* Read in the sysctl name for better debug message logging */
2965 for (i = 0; i < args->nlen; i++)
2966 if (get_user(name[i], args->name + i))
2969 /* Ignore accesses to kernel.version */
2970 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2973 if (msg_count < 5) {
2976 "warning: process `%s' used the deprecated sysctl "
2977 "system call with ", current->comm);
2978 for (i = 0; i < args->nlen; i++)
2979 printk("%d.", name[i]);
2986 * No sense putting this after each symbol definition, twice,
2987 * exception granted :-)
2989 EXPORT_SYMBOL(proc_dointvec);
2990 EXPORT_SYMBOL(proc_dointvec_jiffies);
2991 EXPORT_SYMBOL(proc_dointvec_minmax);
2992 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2993 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2994 EXPORT_SYMBOL(proc_dostring);
2995 EXPORT_SYMBOL(proc_doulongvec_minmax);
2996 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2997 EXPORT_SYMBOL(register_sysctl_table);
2998 EXPORT_SYMBOL(register_sysctl_paths);
2999 EXPORT_SYMBOL(sysctl_intvec);
3000 EXPORT_SYMBOL(sysctl_jiffies);
3001 EXPORT_SYMBOL(sysctl_ms_jiffies);
3002 EXPORT_SYMBOL(sysctl_string);
3003 EXPORT_SYMBOL(sysctl_data);
3004 EXPORT_SYMBOL(unregister_sysctl_table);