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/capability.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/capability.h>
31 #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/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
49 #include <asm/uaccess.h>
50 #include <asm/processor.h>
52 extern int proc_nr_files(ctl_table
*table
, int write
, struct file
*filp
,
53 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
57 #include <asm/stacktrace.h>
60 #if defined(CONFIG_SYSCTL)
62 /* External variables not in a header file. */
64 extern int print_fatal_signals
;
65 extern int sysctl_overcommit_memory
;
66 extern int sysctl_overcommit_ratio
;
67 extern int sysctl_panic_on_oom
;
68 extern int max_threads
;
69 extern int core_uses_pid
;
70 extern int suid_dumpable
;
71 extern char core_pattern
[];
73 extern int min_free_kbytes
;
74 extern int printk_ratelimit_jiffies
;
75 extern int printk_ratelimit_burst
;
76 extern int pid_max_min
, pid_max_max
;
77 extern int sysctl_drop_caches
;
78 extern int percpu_pagelist_fraction
;
79 extern int compat_log
;
80 extern int maps_protect
;
81 extern int sysctl_stat_interval
;
83 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
84 static int maxolduid
= 65535;
86 static int min_percpu_pagelist_fract
= 8;
88 static int ngroups_max
= NGROUPS_MAX
;
91 extern char modprobe_path
[];
93 #ifdef CONFIG_CHR_DEV_SG
94 extern int sg_big_buff
;
98 extern char reboot_command
[];
99 extern int stop_a_enabled
;
100 extern int scons_pwroff
;
104 extern int pwrsw_enabled
;
105 extern int unaligned_enabled
;
109 #ifdef CONFIG_MATHEMU
110 extern int sysctl_ieee_emulation_warnings
;
112 extern int sysctl_userprocess_debug
;
113 extern int spin_retry
;
116 extern int sysctl_hz_timer
;
118 #ifdef CONFIG_BSD_PROCESS_ACCT
119 extern int acct_parm
[];
123 extern int no_unaligned_warning
;
126 #ifdef CONFIG_RT_MUTEXES
127 extern int max_lock_depth
;
130 #ifdef CONFIG_SYSCTL_SYSCALL
131 static int parse_table(int __user
*, int, void __user
*, size_t __user
*,
132 void __user
*, size_t, ctl_table
*);
136 #ifdef CONFIG_PROC_SYSCTL
137 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
138 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
139 static int proc_dointvec_taint(ctl_table
*table
, int write
, struct file
*filp
,
140 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
143 static ctl_table root_table
[];
144 static struct ctl_table_header root_table_header
=
145 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
147 static ctl_table kern_table
[];
148 static ctl_table vm_table
[];
149 static ctl_table fs_table
[];
150 static ctl_table debug_table
[];
151 static ctl_table dev_table
[];
152 extern ctl_table random_table
[];
153 #ifdef CONFIG_UNIX98_PTYS
154 extern ctl_table pty_table
[];
156 #ifdef CONFIG_INOTIFY_USER
157 extern ctl_table inotify_table
[];
160 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
161 int sysctl_legacy_va_layout
;
165 /* The default sysctl tables: */
167 static ctl_table root_table
[] = {
169 .ctl_name
= CTL_KERN
,
170 .procname
= "kernel",
195 .ctl_name
= CTL_DEBUG
,
198 .child
= debug_table
,
207 * NOTE: do not add new entries to this table unless you have read
208 * Documentation/sysctl/ctl_unnumbered.txt
213 #ifdef CONFIG_SCHED_DEBUG
214 static unsigned long min_sched_granularity_ns
= 100000; /* 100 usecs */
215 static unsigned long max_sched_granularity_ns
= 1000000000; /* 1 second */
216 static unsigned long min_wakeup_granularity_ns
; /* 0 usecs */
217 static unsigned long max_wakeup_granularity_ns
= 1000000000; /* 1 second */
220 static ctl_table kern_table
[] = {
221 #ifdef CONFIG_SCHED_DEBUG
223 .ctl_name
= CTL_UNNUMBERED
,
224 .procname
= "sched_granularity_ns",
225 .data
= &sysctl_sched_granularity
,
226 .maxlen
= sizeof(unsigned int),
228 .proc_handler
= &proc_dointvec_minmax
,
229 .strategy
= &sysctl_intvec
,
230 .extra1
= &min_sched_granularity_ns
,
231 .extra2
= &max_sched_granularity_ns
,
234 .ctl_name
= CTL_UNNUMBERED
,
235 .procname
= "sched_wakeup_granularity_ns",
236 .data
= &sysctl_sched_wakeup_granularity
,
237 .maxlen
= sizeof(unsigned int),
239 .proc_handler
= &proc_dointvec_minmax
,
240 .strategy
= &sysctl_intvec
,
241 .extra1
= &min_wakeup_granularity_ns
,
242 .extra2
= &max_wakeup_granularity_ns
,
245 .ctl_name
= CTL_UNNUMBERED
,
246 .procname
= "sched_batch_wakeup_granularity_ns",
247 .data
= &sysctl_sched_batch_wakeup_granularity
,
248 .maxlen
= sizeof(unsigned int),
250 .proc_handler
= &proc_dointvec_minmax
,
251 .strategy
= &sysctl_intvec
,
252 .extra1
= &min_wakeup_granularity_ns
,
253 .extra2
= &max_wakeup_granularity_ns
,
256 .ctl_name
= CTL_UNNUMBERED
,
257 .procname
= "sched_stat_granularity_ns",
258 .data
= &sysctl_sched_stat_granularity
,
259 .maxlen
= sizeof(unsigned int),
261 .proc_handler
= &proc_dointvec_minmax
,
262 .strategy
= &sysctl_intvec
,
263 .extra1
= &min_wakeup_granularity_ns
,
264 .extra2
= &max_wakeup_granularity_ns
,
267 .ctl_name
= CTL_UNNUMBERED
,
268 .procname
= "sched_runtime_limit_ns",
269 .data
= &sysctl_sched_runtime_limit
,
270 .maxlen
= sizeof(unsigned int),
272 .proc_handler
= &proc_dointvec_minmax
,
273 .strategy
= &sysctl_intvec
,
274 .extra1
= &min_sched_granularity_ns
,
275 .extra2
= &max_sched_granularity_ns
,
278 .ctl_name
= CTL_UNNUMBERED
,
279 .procname
= "sched_child_runs_first",
280 .data
= &sysctl_sched_child_runs_first
,
281 .maxlen
= sizeof(unsigned int),
283 .proc_handler
= &proc_dointvec
,
286 .ctl_name
= CTL_UNNUMBERED
,
287 .procname
= "sched_features",
288 .data
= &sysctl_sched_features
,
289 .maxlen
= sizeof(unsigned int),
291 .proc_handler
= &proc_dointvec
,
295 .ctl_name
= KERN_PANIC
,
297 .data
= &panic_timeout
,
298 .maxlen
= sizeof(int),
300 .proc_handler
= &proc_dointvec
,
303 .ctl_name
= KERN_CORE_USES_PID
,
304 .procname
= "core_uses_pid",
305 .data
= &core_uses_pid
,
306 .maxlen
= sizeof(int),
308 .proc_handler
= &proc_dointvec
,
311 .ctl_name
= KERN_CORE_PATTERN
,
312 .procname
= "core_pattern",
313 .data
= core_pattern
,
314 .maxlen
= CORENAME_MAX_SIZE
,
316 .proc_handler
= &proc_dostring
,
317 .strategy
= &sysctl_string
,
319 #ifdef CONFIG_PROC_SYSCTL
321 .ctl_name
= KERN_TAINTED
,
322 .procname
= "tainted",
324 .maxlen
= sizeof(int),
326 .proc_handler
= &proc_dointvec_taint
,
330 .ctl_name
= KERN_CAP_BSET
,
331 .procname
= "cap-bound",
333 .maxlen
= sizeof(kernel_cap_t
),
335 .proc_handler
= &proc_dointvec_bset
,
337 #ifdef CONFIG_BLK_DEV_INITRD
339 .ctl_name
= KERN_REALROOTDEV
,
340 .procname
= "real-root-dev",
341 .data
= &real_root_dev
,
342 .maxlen
= sizeof(int),
344 .proc_handler
= &proc_dointvec
,
348 .ctl_name
= CTL_UNNUMBERED
,
349 .procname
= "print-fatal-signals",
350 .data
= &print_fatal_signals
,
351 .maxlen
= sizeof(int),
353 .proc_handler
= &proc_dointvec
,
357 .ctl_name
= KERN_SPARC_REBOOT
,
358 .procname
= "reboot-cmd",
359 .data
= reboot_command
,
362 .proc_handler
= &proc_dostring
,
363 .strategy
= &sysctl_string
,
366 .ctl_name
= KERN_SPARC_STOP_A
,
367 .procname
= "stop-a",
368 .data
= &stop_a_enabled
,
369 .maxlen
= sizeof (int),
371 .proc_handler
= &proc_dointvec
,
374 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
375 .procname
= "scons-poweroff",
376 .data
= &scons_pwroff
,
377 .maxlen
= sizeof (int),
379 .proc_handler
= &proc_dointvec
,
384 .ctl_name
= KERN_HPPA_PWRSW
,
385 .procname
= "soft-power",
386 .data
= &pwrsw_enabled
,
387 .maxlen
= sizeof (int),
389 .proc_handler
= &proc_dointvec
,
392 .ctl_name
= KERN_HPPA_UNALIGNED
,
393 .procname
= "unaligned-trap",
394 .data
= &unaligned_enabled
,
395 .maxlen
= sizeof (int),
397 .proc_handler
= &proc_dointvec
,
401 .ctl_name
= KERN_CTLALTDEL
,
402 .procname
= "ctrl-alt-del",
404 .maxlen
= sizeof(int),
406 .proc_handler
= &proc_dointvec
,
409 .ctl_name
= KERN_PRINTK
,
410 .procname
= "printk",
411 .data
= &console_loglevel
,
412 .maxlen
= 4*sizeof(int),
414 .proc_handler
= &proc_dointvec
,
418 .ctl_name
= KERN_MODPROBE
,
419 .procname
= "modprobe",
420 .data
= &modprobe_path
,
421 .maxlen
= KMOD_PATH_LEN
,
423 .proc_handler
= &proc_dostring
,
424 .strategy
= &sysctl_string
,
427 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
429 .ctl_name
= KERN_HOTPLUG
,
430 .procname
= "hotplug",
431 .data
= &uevent_helper
,
432 .maxlen
= UEVENT_HELPER_PATH_LEN
,
434 .proc_handler
= &proc_dostring
,
435 .strategy
= &sysctl_string
,
438 #ifdef CONFIG_CHR_DEV_SG
440 .ctl_name
= KERN_SG_BIG_BUFF
,
441 .procname
= "sg-big-buff",
442 .data
= &sg_big_buff
,
443 .maxlen
= sizeof (int),
445 .proc_handler
= &proc_dointvec
,
448 #ifdef CONFIG_BSD_PROCESS_ACCT
450 .ctl_name
= KERN_ACCT
,
453 .maxlen
= 3*sizeof(int),
455 .proc_handler
= &proc_dointvec
,
458 #ifdef CONFIG_MAGIC_SYSRQ
460 .ctl_name
= KERN_SYSRQ
,
462 .data
= &__sysrq_enabled
,
463 .maxlen
= sizeof (int),
465 .proc_handler
= &proc_dointvec
,
468 #ifdef CONFIG_PROC_SYSCTL
470 .ctl_name
= KERN_CADPID
,
471 .procname
= "cad_pid",
473 .maxlen
= sizeof (int),
475 .proc_handler
= &proc_do_cad_pid
,
479 .ctl_name
= KERN_MAX_THREADS
,
480 .procname
= "threads-max",
481 .data
= &max_threads
,
482 .maxlen
= sizeof(int),
484 .proc_handler
= &proc_dointvec
,
487 .ctl_name
= KERN_RANDOM
,
488 .procname
= "random",
490 .child
= random_table
,
492 #ifdef CONFIG_UNIX98_PTYS
494 .ctl_name
= KERN_PTY
,
501 .ctl_name
= KERN_OVERFLOWUID
,
502 .procname
= "overflowuid",
503 .data
= &overflowuid
,
504 .maxlen
= sizeof(int),
506 .proc_handler
= &proc_dointvec_minmax
,
507 .strategy
= &sysctl_intvec
,
508 .extra1
= &minolduid
,
509 .extra2
= &maxolduid
,
512 .ctl_name
= KERN_OVERFLOWGID
,
513 .procname
= "overflowgid",
514 .data
= &overflowgid
,
515 .maxlen
= sizeof(int),
517 .proc_handler
= &proc_dointvec_minmax
,
518 .strategy
= &sysctl_intvec
,
519 .extra1
= &minolduid
,
520 .extra2
= &maxolduid
,
523 #ifdef CONFIG_MATHEMU
525 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
526 .procname
= "ieee_emulation_warnings",
527 .data
= &sysctl_ieee_emulation_warnings
,
528 .maxlen
= sizeof(int),
530 .proc_handler
= &proc_dointvec
,
533 #ifdef CONFIG_NO_IDLE_HZ
535 .ctl_name
= KERN_HZ_TIMER
,
536 .procname
= "hz_timer",
537 .data
= &sysctl_hz_timer
,
538 .maxlen
= sizeof(int),
540 .proc_handler
= &proc_dointvec
,
544 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
545 .procname
= "userprocess_debug",
546 .data
= &sysctl_userprocess_debug
,
547 .maxlen
= sizeof(int),
549 .proc_handler
= &proc_dointvec
,
553 .ctl_name
= KERN_PIDMAX
,
554 .procname
= "pid_max",
556 .maxlen
= sizeof (int),
558 .proc_handler
= &proc_dointvec_minmax
,
559 .strategy
= sysctl_intvec
,
560 .extra1
= &pid_max_min
,
561 .extra2
= &pid_max_max
,
564 .ctl_name
= KERN_PANIC_ON_OOPS
,
565 .procname
= "panic_on_oops",
566 .data
= &panic_on_oops
,
567 .maxlen
= sizeof(int),
569 .proc_handler
= &proc_dointvec
,
572 .ctl_name
= KERN_PRINTK_RATELIMIT
,
573 .procname
= "printk_ratelimit",
574 .data
= &printk_ratelimit_jiffies
,
575 .maxlen
= sizeof(int),
577 .proc_handler
= &proc_dointvec_jiffies
,
578 .strategy
= &sysctl_jiffies
,
581 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
582 .procname
= "printk_ratelimit_burst",
583 .data
= &printk_ratelimit_burst
,
584 .maxlen
= sizeof(int),
586 .proc_handler
= &proc_dointvec
,
589 .ctl_name
= KERN_NGROUPS_MAX
,
590 .procname
= "ngroups_max",
591 .data
= &ngroups_max
,
592 .maxlen
= sizeof (int),
594 .proc_handler
= &proc_dointvec
,
596 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
598 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
599 .procname
= "unknown_nmi_panic",
600 .data
= &unknown_nmi_panic
,
601 .maxlen
= sizeof (int),
603 .proc_handler
= &proc_dointvec
,
606 .ctl_name
= KERN_NMI_WATCHDOG
,
607 .procname
= "nmi_watchdog",
608 .data
= &nmi_watchdog_enabled
,
609 .maxlen
= sizeof (int),
611 .proc_handler
= &proc_nmi_enabled
,
614 #if defined(CONFIG_X86)
616 .ctl_name
= KERN_PANIC_ON_NMI
,
617 .procname
= "panic_on_unrecovered_nmi",
618 .data
= &panic_on_unrecovered_nmi
,
619 .maxlen
= sizeof(int),
621 .proc_handler
= &proc_dointvec
,
624 .ctl_name
= KERN_BOOTLOADER_TYPE
,
625 .procname
= "bootloader_type",
626 .data
= &bootloader_type
,
627 .maxlen
= sizeof (int),
629 .proc_handler
= &proc_dointvec
,
632 .ctl_name
= CTL_UNNUMBERED
,
633 .procname
= "kstack_depth_to_print",
634 .data
= &kstack_depth_to_print
,
635 .maxlen
= sizeof(int),
637 .proc_handler
= &proc_dointvec
,
640 #if defined(CONFIG_MMU)
642 .ctl_name
= KERN_RANDOMIZE
,
643 .procname
= "randomize_va_space",
644 .data
= &randomize_va_space
,
645 .maxlen
= sizeof(int),
647 .proc_handler
= &proc_dointvec
,
650 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
652 .ctl_name
= KERN_SPIN_RETRY
,
653 .procname
= "spin_retry",
655 .maxlen
= sizeof (int),
657 .proc_handler
= &proc_dointvec
,
660 #ifdef CONFIG_ACPI_SLEEP
662 .ctl_name
= KERN_ACPI_VIDEO_FLAGS
,
663 .procname
= "acpi_video_flags",
664 .data
= &acpi_video_flags
,
665 .maxlen
= sizeof (unsigned long),
667 .proc_handler
= &proc_doulongvec_minmax
,
672 .ctl_name
= KERN_IA64_UNALIGNED
,
673 .procname
= "ignore-unaligned-usertrap",
674 .data
= &no_unaligned_warning
,
675 .maxlen
= sizeof (int),
677 .proc_handler
= &proc_dointvec
,
682 .ctl_name
= KERN_COMPAT_LOG
,
683 .procname
= "compat-log",
685 .maxlen
= sizeof (int),
687 .proc_handler
= &proc_dointvec
,
690 #ifdef CONFIG_RT_MUTEXES
692 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
693 .procname
= "max_lock_depth",
694 .data
= &max_lock_depth
,
695 .maxlen
= sizeof(int),
697 .proc_handler
= &proc_dointvec
,
700 #ifdef CONFIG_PROC_FS
702 .ctl_name
= CTL_UNNUMBERED
,
703 .procname
= "maps_protect",
704 .data
= &maps_protect
,
705 .maxlen
= sizeof(int),
707 .proc_handler
= &proc_dointvec
,
714 /* Constants for minimum and maximum testing in vm_table.
715 We use these as one-element integer vectors. */
717 static int one_hundred
= 100;
720 static ctl_table vm_table
[] = {
722 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
723 .procname
= "overcommit_memory",
724 .data
= &sysctl_overcommit_memory
,
725 .maxlen
= sizeof(sysctl_overcommit_memory
),
727 .proc_handler
= &proc_dointvec
,
730 .ctl_name
= VM_PANIC_ON_OOM
,
731 .procname
= "panic_on_oom",
732 .data
= &sysctl_panic_on_oom
,
733 .maxlen
= sizeof(sysctl_panic_on_oom
),
735 .proc_handler
= &proc_dointvec
,
738 .ctl_name
= VM_OVERCOMMIT_RATIO
,
739 .procname
= "overcommit_ratio",
740 .data
= &sysctl_overcommit_ratio
,
741 .maxlen
= sizeof(sysctl_overcommit_ratio
),
743 .proc_handler
= &proc_dointvec
,
746 .ctl_name
= VM_PAGE_CLUSTER
,
747 .procname
= "page-cluster",
748 .data
= &page_cluster
,
749 .maxlen
= sizeof(int),
751 .proc_handler
= &proc_dointvec
,
754 .ctl_name
= VM_DIRTY_BACKGROUND
,
755 .procname
= "dirty_background_ratio",
756 .data
= &dirty_background_ratio
,
757 .maxlen
= sizeof(dirty_background_ratio
),
759 .proc_handler
= &proc_dointvec_minmax
,
760 .strategy
= &sysctl_intvec
,
762 .extra2
= &one_hundred
,
765 .ctl_name
= VM_DIRTY_RATIO
,
766 .procname
= "dirty_ratio",
767 .data
= &vm_dirty_ratio
,
768 .maxlen
= sizeof(vm_dirty_ratio
),
770 .proc_handler
= &proc_dointvec_minmax
,
771 .strategy
= &sysctl_intvec
,
773 .extra2
= &one_hundred
,
776 .ctl_name
= VM_DIRTY_WB_CS
,
777 .procname
= "dirty_writeback_centisecs",
778 .data
= &dirty_writeback_interval
,
779 .maxlen
= sizeof(dirty_writeback_interval
),
781 .proc_handler
= &dirty_writeback_centisecs_handler
,
784 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
785 .procname
= "dirty_expire_centisecs",
786 .data
= &dirty_expire_interval
,
787 .maxlen
= sizeof(dirty_expire_interval
),
789 .proc_handler
= &proc_dointvec_userhz_jiffies
,
792 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
793 .procname
= "nr_pdflush_threads",
794 .data
= &nr_pdflush_threads
,
795 .maxlen
= sizeof nr_pdflush_threads
,
796 .mode
= 0444 /* read-only*/,
797 .proc_handler
= &proc_dointvec
,
800 .ctl_name
= VM_SWAPPINESS
,
801 .procname
= "swappiness",
802 .data
= &vm_swappiness
,
803 .maxlen
= sizeof(vm_swappiness
),
805 .proc_handler
= &proc_dointvec_minmax
,
806 .strategy
= &sysctl_intvec
,
808 .extra2
= &one_hundred
,
810 #ifdef CONFIG_HUGETLB_PAGE
812 .ctl_name
= VM_HUGETLB_PAGES
,
813 .procname
= "nr_hugepages",
814 .data
= &max_huge_pages
,
815 .maxlen
= sizeof(unsigned long),
817 .proc_handler
= &hugetlb_sysctl_handler
,
818 .extra1
= (void *)&hugetlb_zero
,
819 .extra2
= (void *)&hugetlb_infinity
,
822 .ctl_name
= VM_HUGETLB_GROUP
,
823 .procname
= "hugetlb_shm_group",
824 .data
= &sysctl_hugetlb_shm_group
,
825 .maxlen
= sizeof(gid_t
),
827 .proc_handler
= &proc_dointvec
,
831 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
832 .procname
= "lowmem_reserve_ratio",
833 .data
= &sysctl_lowmem_reserve_ratio
,
834 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
836 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
837 .strategy
= &sysctl_intvec
,
840 .ctl_name
= VM_DROP_PAGECACHE
,
841 .procname
= "drop_caches",
842 .data
= &sysctl_drop_caches
,
843 .maxlen
= sizeof(int),
845 .proc_handler
= drop_caches_sysctl_handler
,
846 .strategy
= &sysctl_intvec
,
849 .ctl_name
= VM_MIN_FREE_KBYTES
,
850 .procname
= "min_free_kbytes",
851 .data
= &min_free_kbytes
,
852 .maxlen
= sizeof(min_free_kbytes
),
854 .proc_handler
= &min_free_kbytes_sysctl_handler
,
855 .strategy
= &sysctl_intvec
,
859 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
860 .procname
= "percpu_pagelist_fraction",
861 .data
= &percpu_pagelist_fraction
,
862 .maxlen
= sizeof(percpu_pagelist_fraction
),
864 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
865 .strategy
= &sysctl_intvec
,
866 .extra1
= &min_percpu_pagelist_fract
,
870 .ctl_name
= VM_MAX_MAP_COUNT
,
871 .procname
= "max_map_count",
872 .data
= &sysctl_max_map_count
,
873 .maxlen
= sizeof(sysctl_max_map_count
),
875 .proc_handler
= &proc_dointvec
879 .ctl_name
= VM_LAPTOP_MODE
,
880 .procname
= "laptop_mode",
881 .data
= &laptop_mode
,
882 .maxlen
= sizeof(laptop_mode
),
884 .proc_handler
= &proc_dointvec_jiffies
,
885 .strategy
= &sysctl_jiffies
,
888 .ctl_name
= VM_BLOCK_DUMP
,
889 .procname
= "block_dump",
891 .maxlen
= sizeof(block_dump
),
893 .proc_handler
= &proc_dointvec
,
894 .strategy
= &sysctl_intvec
,
898 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
899 .procname
= "vfs_cache_pressure",
900 .data
= &sysctl_vfs_cache_pressure
,
901 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
903 .proc_handler
= &proc_dointvec
,
904 .strategy
= &sysctl_intvec
,
907 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
909 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
910 .procname
= "legacy_va_layout",
911 .data
= &sysctl_legacy_va_layout
,
912 .maxlen
= sizeof(sysctl_legacy_va_layout
),
914 .proc_handler
= &proc_dointvec
,
915 .strategy
= &sysctl_intvec
,
921 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
922 .procname
= "zone_reclaim_mode",
923 .data
= &zone_reclaim_mode
,
924 .maxlen
= sizeof(zone_reclaim_mode
),
926 .proc_handler
= &proc_dointvec
,
927 .strategy
= &sysctl_intvec
,
931 .ctl_name
= VM_MIN_UNMAPPED
,
932 .procname
= "min_unmapped_ratio",
933 .data
= &sysctl_min_unmapped_ratio
,
934 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
936 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
937 .strategy
= &sysctl_intvec
,
939 .extra2
= &one_hundred
,
942 .ctl_name
= VM_MIN_SLAB
,
943 .procname
= "min_slab_ratio",
944 .data
= &sysctl_min_slab_ratio
,
945 .maxlen
= sizeof(sysctl_min_slab_ratio
),
947 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
948 .strategy
= &sysctl_intvec
,
950 .extra2
= &one_hundred
,
955 .ctl_name
= CTL_UNNUMBERED
,
956 .procname
= "stat_interval",
957 .data
= &sysctl_stat_interval
,
958 .maxlen
= sizeof(sysctl_stat_interval
),
960 .proc_handler
= &proc_dointvec_jiffies
,
961 .strategy
= &sysctl_jiffies
,
964 #ifdef CONFIG_SECURITY
966 .ctl_name
= CTL_UNNUMBERED
,
967 .procname
= "mmap_min_addr",
968 .data
= &mmap_min_addr
,
969 .maxlen
= sizeof(unsigned long),
971 .proc_handler
= &proc_doulongvec_minmax
,
975 .ctl_name
= CTL_UNNUMBERED
,
976 .procname
= "numa_zonelist_order",
977 .data
= &numa_zonelist_order
,
978 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
980 .proc_handler
= &numa_zonelist_order_handler
,
981 .strategy
= &sysctl_string
,
985 #if defined(CONFIG_X86_32) || \
986 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
988 .ctl_name
= VM_VDSO_ENABLED
,
989 .procname
= "vdso_enabled",
990 .data
= &vdso_enabled
,
991 .maxlen
= sizeof(vdso_enabled
),
993 .proc_handler
= &proc_dointvec
,
994 .strategy
= &sysctl_intvec
,
999 * NOTE: do not add new entries to this table unless you have read
1000 * Documentation/sysctl/ctl_unnumbered.txt
1003 * NOTE: do not add new entries to this table unless you have read
1004 * Documentation/sysctl/ctl_unnumbered.txt
1009 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1010 static ctl_table binfmt_misc_table
[] = {
1015 static ctl_table fs_table
[] = {
1017 .ctl_name
= FS_NRINODE
,
1018 .procname
= "inode-nr",
1019 .data
= &inodes_stat
,
1020 .maxlen
= 2*sizeof(int),
1022 .proc_handler
= &proc_dointvec
,
1025 .ctl_name
= FS_STATINODE
,
1026 .procname
= "inode-state",
1027 .data
= &inodes_stat
,
1028 .maxlen
= 7*sizeof(int),
1030 .proc_handler
= &proc_dointvec
,
1033 .ctl_name
= FS_NRFILE
,
1034 .procname
= "file-nr",
1035 .data
= &files_stat
,
1036 .maxlen
= 3*sizeof(int),
1038 .proc_handler
= &proc_nr_files
,
1041 .ctl_name
= FS_MAXFILE
,
1042 .procname
= "file-max",
1043 .data
= &files_stat
.max_files
,
1044 .maxlen
= sizeof(int),
1046 .proc_handler
= &proc_dointvec
,
1049 .ctl_name
= FS_DENTRY
,
1050 .procname
= "dentry-state",
1051 .data
= &dentry_stat
,
1052 .maxlen
= 6*sizeof(int),
1054 .proc_handler
= &proc_dointvec
,
1057 .ctl_name
= FS_OVERFLOWUID
,
1058 .procname
= "overflowuid",
1059 .data
= &fs_overflowuid
,
1060 .maxlen
= sizeof(int),
1062 .proc_handler
= &proc_dointvec_minmax
,
1063 .strategy
= &sysctl_intvec
,
1064 .extra1
= &minolduid
,
1065 .extra2
= &maxolduid
,
1068 .ctl_name
= FS_OVERFLOWGID
,
1069 .procname
= "overflowgid",
1070 .data
= &fs_overflowgid
,
1071 .maxlen
= sizeof(int),
1073 .proc_handler
= &proc_dointvec_minmax
,
1074 .strategy
= &sysctl_intvec
,
1075 .extra1
= &minolduid
,
1076 .extra2
= &maxolduid
,
1079 .ctl_name
= FS_LEASES
,
1080 .procname
= "leases-enable",
1081 .data
= &leases_enable
,
1082 .maxlen
= sizeof(int),
1084 .proc_handler
= &proc_dointvec
,
1086 #ifdef CONFIG_DNOTIFY
1088 .ctl_name
= FS_DIR_NOTIFY
,
1089 .procname
= "dir-notify-enable",
1090 .data
= &dir_notify_enable
,
1091 .maxlen
= sizeof(int),
1093 .proc_handler
= &proc_dointvec
,
1098 .ctl_name
= FS_LEASE_TIME
,
1099 .procname
= "lease-break-time",
1100 .data
= &lease_break_time
,
1101 .maxlen
= sizeof(int),
1103 .proc_handler
= &proc_dointvec
,
1106 .ctl_name
= FS_AIO_NR
,
1107 .procname
= "aio-nr",
1109 .maxlen
= sizeof(aio_nr
),
1111 .proc_handler
= &proc_doulongvec_minmax
,
1114 .ctl_name
= FS_AIO_MAX_NR
,
1115 .procname
= "aio-max-nr",
1116 .data
= &aio_max_nr
,
1117 .maxlen
= sizeof(aio_max_nr
),
1119 .proc_handler
= &proc_doulongvec_minmax
,
1121 #ifdef CONFIG_INOTIFY_USER
1123 .ctl_name
= FS_INOTIFY
,
1124 .procname
= "inotify",
1126 .child
= inotify_table
,
1131 .ctl_name
= KERN_SETUID_DUMPABLE
,
1132 .procname
= "suid_dumpable",
1133 .data
= &suid_dumpable
,
1134 .maxlen
= sizeof(int),
1136 .proc_handler
= &proc_dointvec
,
1138 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1140 .ctl_name
= CTL_UNNUMBERED
,
1141 .procname
= "binfmt_misc",
1143 .child
= binfmt_misc_table
,
1147 * NOTE: do not add new entries to this table unless you have read
1148 * Documentation/sysctl/ctl_unnumbered.txt
1151 * NOTE: do not add new entries to this table unless you have read
1152 * Documentation/sysctl/ctl_unnumbered.txt
1157 static ctl_table debug_table
[] = {
1161 static ctl_table dev_table
[] = {
1165 static DEFINE_SPINLOCK(sysctl_lock
);
1167 /* called under sysctl_lock */
1168 static int use_table(struct ctl_table_header
*p
)
1170 if (unlikely(p
->unregistering
))
1176 /* called under sysctl_lock */
1177 static void unuse_table(struct ctl_table_header
*p
)
1180 if (unlikely(p
->unregistering
))
1181 complete(p
->unregistering
);
1184 /* called under sysctl_lock, will reacquire if has to wait */
1185 static void start_unregistering(struct ctl_table_header
*p
)
1188 * if p->used is 0, nobody will ever touch that entry again;
1189 * we'll eliminate all paths to it before dropping sysctl_lock
1191 if (unlikely(p
->used
)) {
1192 struct completion wait
;
1193 init_completion(&wait
);
1194 p
->unregistering
= &wait
;
1195 spin_unlock(&sysctl_lock
);
1196 wait_for_completion(&wait
);
1197 spin_lock(&sysctl_lock
);
1200 * do not remove from the list until nobody holds it; walking the
1201 * list in do_sysctl() relies on that.
1203 list_del_init(&p
->ctl_entry
);
1206 void sysctl_head_finish(struct ctl_table_header
*head
)
1210 spin_lock(&sysctl_lock
);
1212 spin_unlock(&sysctl_lock
);
1215 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1217 struct ctl_table_header
*head
;
1218 struct list_head
*tmp
;
1219 spin_lock(&sysctl_lock
);
1221 tmp
= &prev
->ctl_entry
;
1225 tmp
= &root_table_header
.ctl_entry
;
1227 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1229 if (!use_table(head
))
1231 spin_unlock(&sysctl_lock
);
1235 if (tmp
== &root_table_header
.ctl_entry
)
1238 spin_unlock(&sysctl_lock
);
1242 #ifdef CONFIG_SYSCTL_SYSCALL
1243 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1244 void __user
*newval
, size_t newlen
)
1246 struct ctl_table_header
*head
;
1247 int error
= -ENOTDIR
;
1249 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1253 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1257 for (head
= sysctl_head_next(NULL
); head
;
1258 head
= sysctl_head_next(head
)) {
1259 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1260 newval
, newlen
, head
->ctl_table
);
1261 if (error
!= -ENOTDIR
) {
1262 sysctl_head_finish(head
);
1269 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1271 struct __sysctl_args tmp
;
1274 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1278 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1279 tmp
.newval
, tmp
.newlen
);
1283 #endif /* CONFIG_SYSCTL_SYSCALL */
1286 * sysctl_perm does NOT grant the superuser all rights automatically, because
1287 * some sysctl variables are readonly even to root.
1290 static int test_perm(int mode
, int op
)
1294 else if (in_egroup_p(0))
1296 if ((mode
& op
& 0007) == op
)
1301 int sysctl_perm(ctl_table
*table
, int op
)
1304 error
= security_sysctl(table
, op
);
1307 return test_perm(table
->mode
, op
);
1310 #ifdef CONFIG_SYSCTL_SYSCALL
1311 static int parse_table(int __user
*name
, int nlen
,
1312 void __user
*oldval
, size_t __user
*oldlenp
,
1313 void __user
*newval
, size_t newlen
,
1320 if (get_user(n
, name
))
1322 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1323 if (!table
->ctl_name
)
1325 if (n
== table
->ctl_name
) {
1328 if (sysctl_perm(table
, 001))
1332 table
= table
->child
;
1335 error
= do_sysctl_strategy(table
, name
, nlen
,
1344 /* Perform the actual read/write of a sysctl table entry. */
1345 int do_sysctl_strategy (ctl_table
*table
,
1346 int __user
*name
, int nlen
,
1347 void __user
*oldval
, size_t __user
*oldlenp
,
1348 void __user
*newval
, size_t newlen
)
1357 if (sysctl_perm(table
, op
))
1360 if (table
->strategy
) {
1361 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1369 /* If there is no strategy routine, or if the strategy returns
1370 * zero, proceed with automatic r/w */
1371 if (table
->data
&& table
->maxlen
) {
1372 if (oldval
&& oldlenp
) {
1373 if (get_user(len
, oldlenp
))
1376 if (len
> table
->maxlen
)
1377 len
= table
->maxlen
;
1378 if(copy_to_user(oldval
, table
->data
, len
))
1380 if(put_user(len
, oldlenp
))
1384 if (newval
&& newlen
) {
1386 if (len
> table
->maxlen
)
1387 len
= table
->maxlen
;
1388 if(copy_from_user(table
->data
, newval
, len
))
1394 #endif /* CONFIG_SYSCTL_SYSCALL */
1396 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1398 for (; table
->ctl_name
|| table
->procname
; table
++) {
1399 table
->parent
= parent
;
1401 sysctl_set_parent(table
, table
->child
);
1405 static __init
int sysctl_init(void)
1407 sysctl_set_parent(NULL
, root_table
);
1411 core_initcall(sysctl_init
);
1414 * register_sysctl_table - register a sysctl hierarchy
1415 * @table: the top-level table structure
1417 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1418 * array. An entry with a ctl_name of 0 terminates the table.
1420 * The members of the &ctl_table structure are used as follows:
1422 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1423 * must be unique within that level of sysctl
1425 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1426 * enter a sysctl file
1428 * data - a pointer to data for use by proc_handler
1430 * maxlen - the maximum size in bytes of the data
1432 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1434 * child - a pointer to the child sysctl table if this entry is a directory, or
1437 * proc_handler - the text handler routine (described below)
1439 * strategy - the strategy routine (described below)
1441 * de - for internal use by the sysctl routines
1443 * extra1, extra2 - extra pointers usable by the proc handler routines
1445 * Leaf nodes in the sysctl tree will be represented by a single file
1446 * under /proc; non-leaf nodes will be represented by directories.
1448 * sysctl(2) can automatically manage read and write requests through
1449 * the sysctl table. The data and maxlen fields of the ctl_table
1450 * struct enable minimal validation of the values being written to be
1451 * performed, and the mode field allows minimal authentication.
1453 * More sophisticated management can be enabled by the provision of a
1454 * strategy routine with the table entry. This will be called before
1455 * any automatic read or write of the data is performed.
1457 * The strategy routine may return
1459 * < 0 - Error occurred (error is passed to user process)
1461 * 0 - OK - proceed with automatic read or write.
1463 * > 0 - OK - read or write has been done by the strategy routine, so
1464 * return immediately.
1466 * There must be a proc_handler routine for any terminal nodes
1467 * mirrored under /proc/sys (non-terminals are handled by a built-in
1468 * directory handler). Several default handlers are available to
1469 * cover common cases -
1471 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1472 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1473 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1475 * It is the handler's job to read the input buffer from user memory
1476 * and process it. The handler should return 0 on success.
1478 * This routine returns %NULL on a failure to register, and a pointer
1479 * to the table header on success.
1481 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
)
1483 struct ctl_table_header
*tmp
;
1484 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1487 tmp
->ctl_table
= table
;
1488 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1490 tmp
->unregistering
= NULL
;
1491 sysctl_set_parent(NULL
, table
);
1492 spin_lock(&sysctl_lock
);
1493 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1494 spin_unlock(&sysctl_lock
);
1499 * unregister_sysctl_table - unregister a sysctl table hierarchy
1500 * @header: the header returned from register_sysctl_table
1502 * Unregisters the sysctl table and all children. proc entries may not
1503 * actually be removed until they are no longer used by anyone.
1505 void unregister_sysctl_table(struct ctl_table_header
* header
)
1508 spin_lock(&sysctl_lock
);
1509 start_unregistering(header
);
1510 spin_unlock(&sysctl_lock
);
1514 #else /* !CONFIG_SYSCTL */
1515 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
)
1520 void unregister_sysctl_table(struct ctl_table_header
* table
)
1524 #endif /* CONFIG_SYSCTL */
1530 #ifdef CONFIG_PROC_SYSCTL
1532 static int _proc_do_string(void* data
, int maxlen
, int write
,
1533 struct file
*filp
, void __user
*buffer
,
1534 size_t *lenp
, loff_t
*ppos
)
1540 if (!data
|| !maxlen
|| !*lenp
) {
1548 while (len
< *lenp
) {
1549 if (get_user(c
, p
++))
1551 if (c
== 0 || c
== '\n')
1557 if(copy_from_user(data
, buffer
, len
))
1559 ((char *) data
)[len
] = 0;
1577 if(copy_to_user(buffer
, data
, len
))
1580 if(put_user('\n', ((char __user
*) buffer
) + len
))
1591 * proc_dostring - read a string sysctl
1592 * @table: the sysctl table
1593 * @write: %TRUE if this is a write to the sysctl file
1594 * @filp: the file structure
1595 * @buffer: the user buffer
1596 * @lenp: the size of the user buffer
1597 * @ppos: file position
1599 * Reads/writes a string from/to the user buffer. If the kernel
1600 * buffer provided is not large enough to hold the string, the
1601 * string is truncated. The copied string is %NULL-terminated.
1602 * If the string is being read by the user process, it is copied
1603 * and a newline '\n' is added. It is truncated if the buffer is
1606 * Returns 0 on success.
1608 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1609 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1611 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1612 buffer
, lenp
, ppos
);
1616 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1618 int write
, void *data
)
1621 *valp
= *negp
? -*lvalp
: *lvalp
;
1626 *lvalp
= (unsigned long)-val
;
1629 *lvalp
= (unsigned long)val
;
1635 static int __do_proc_dointvec(void *tbl_data
, ctl_table
*table
,
1636 int write
, struct file
*filp
, void __user
*buffer
,
1637 size_t *lenp
, loff_t
*ppos
,
1638 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1639 int write
, void *data
),
1642 #define TMPBUFLEN 21
1643 int *i
, vleft
, first
=1, neg
, val
;
1647 char buf
[TMPBUFLEN
], *p
;
1648 char __user
*s
= buffer
;
1650 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1651 (*ppos
&& !write
)) {
1656 i
= (int *) tbl_data
;
1657 vleft
= table
->maxlen
/ sizeof(*i
);
1661 conv
= do_proc_dointvec_conv
;
1663 for (; left
&& vleft
--; i
++, first
=0) {
1678 if (len
> sizeof(buf
) - 1)
1679 len
= sizeof(buf
) - 1;
1680 if (copy_from_user(buf
, s
, len
))
1684 if (*p
== '-' && left
> 1) {
1688 if (*p
< '0' || *p
> '9')
1691 lval
= simple_strtoul(p
, &p
, 0);
1694 if ((len
< left
) && *p
&& !isspace(*p
))
1701 if (conv(&neg
, &lval
, i
, 1, data
))
1708 if (conv(&neg
, &lval
, i
, 0, data
))
1711 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1715 if(copy_to_user(s
, buf
, len
))
1722 if (!write
&& !first
&& left
) {
1723 if(put_user('\n', s
))
1730 if (get_user(c
, s
++))
1745 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1746 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1747 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1748 int write
, void *data
),
1751 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
1752 buffer
, lenp
, ppos
, conv
, data
);
1756 * proc_dointvec - read a vector of integers
1757 * @table: the sysctl table
1758 * @write: %TRUE if this is a write to the sysctl file
1759 * @filp: the file structure
1760 * @buffer: the user buffer
1761 * @lenp: the size of the user buffer
1762 * @ppos: file position
1764 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1765 * values from/to the user buffer, treated as an ASCII string.
1767 * Returns 0 on success.
1769 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1770 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1772 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1780 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1782 int write
, void *data
)
1784 int op
= *(int *)data
;
1786 int val
= *negp
? -*lvalp
: *lvalp
;
1788 case OP_SET
: *valp
= val
; break;
1789 case OP_AND
: *valp
&= val
; break;
1790 case OP_OR
: *valp
|= val
; break;
1796 *lvalp
= (unsigned long)-val
;
1799 *lvalp
= (unsigned long)val
;
1806 * init may raise the set.
1809 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1810 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1814 if (write
&& !capable(CAP_SYS_MODULE
)) {
1818 op
= is_init(current
) ? OP_SET
: OP_AND
;
1819 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1820 do_proc_dointvec_bset_conv
,&op
);
1824 * Taint values can only be increased
1826 static int proc_dointvec_taint(ctl_table
*table
, int write
, struct file
*filp
,
1827 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1831 if (write
&& !capable(CAP_SYS_ADMIN
))
1835 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1836 do_proc_dointvec_bset_conv
,&op
);
1839 struct do_proc_dointvec_minmax_conv_param
{
1844 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1846 int write
, void *data
)
1848 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1850 int val
= *negp
? -*lvalp
: *lvalp
;
1851 if ((param
->min
&& *param
->min
> val
) ||
1852 (param
->max
&& *param
->max
< val
))
1859 *lvalp
= (unsigned long)-val
;
1862 *lvalp
= (unsigned long)val
;
1869 * proc_dointvec_minmax - read a vector of integers with min/max values
1870 * @table: the sysctl table
1871 * @write: %TRUE if this is a write to the sysctl file
1872 * @filp: the file structure
1873 * @buffer: the user buffer
1874 * @lenp: the size of the user buffer
1875 * @ppos: file position
1877 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1878 * values from/to the user buffer, treated as an ASCII string.
1880 * This routine will ensure the values are within the range specified by
1881 * table->extra1 (min) and table->extra2 (max).
1883 * Returns 0 on success.
1885 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
1886 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1888 struct do_proc_dointvec_minmax_conv_param param
= {
1889 .min
= (int *) table
->extra1
,
1890 .max
= (int *) table
->extra2
,
1892 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
1893 do_proc_dointvec_minmax_conv
, ¶m
);
1896 static int __do_proc_doulongvec_minmax(void *data
, ctl_table
*table
, int write
,
1898 void __user
*buffer
,
1899 size_t *lenp
, loff_t
*ppos
,
1900 unsigned long convmul
,
1901 unsigned long convdiv
)
1903 #define TMPBUFLEN 21
1904 unsigned long *i
, *min
, *max
, val
;
1905 int vleft
, first
=1, neg
;
1907 char buf
[TMPBUFLEN
], *p
;
1908 char __user
*s
= buffer
;
1910 if (!data
|| !table
->maxlen
|| !*lenp
||
1911 (*ppos
&& !write
)) {
1916 i
= (unsigned long *) data
;
1917 min
= (unsigned long *) table
->extra1
;
1918 max
= (unsigned long *) table
->extra2
;
1919 vleft
= table
->maxlen
/ sizeof(unsigned long);
1922 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
1937 if (len
> TMPBUFLEN
-1)
1939 if (copy_from_user(buf
, s
, len
))
1943 if (*p
== '-' && left
> 1) {
1947 if (*p
< '0' || *p
> '9')
1949 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
1951 if ((len
< left
) && *p
&& !isspace(*p
))
1960 if ((min
&& val
< *min
) || (max
&& val
> *max
))
1967 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
1971 if(copy_to_user(s
, buf
, len
))
1978 if (!write
&& !first
&& left
) {
1979 if(put_user('\n', s
))
1986 if (get_user(c
, s
++))
2001 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
2003 void __user
*buffer
,
2004 size_t *lenp
, loff_t
*ppos
,
2005 unsigned long convmul
,
2006 unsigned long convdiv
)
2008 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2009 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2013 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2014 * @table: the sysctl table
2015 * @write: %TRUE if this is a write to the sysctl file
2016 * @filp: the file structure
2017 * @buffer: the user buffer
2018 * @lenp: the size of the user buffer
2019 * @ppos: file position
2021 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2022 * values from/to the user buffer, treated as an ASCII string.
2024 * This routine will ensure the values are within the range specified by
2025 * table->extra1 (min) and table->extra2 (max).
2027 * Returns 0 on success.
2029 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2030 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2032 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2036 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2037 * @table: the sysctl table
2038 * @write: %TRUE if this is a write to the sysctl file
2039 * @filp: the file structure
2040 * @buffer: the user buffer
2041 * @lenp: the size of the user buffer
2042 * @ppos: file position
2044 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2045 * values from/to the user buffer, treated as an ASCII string. The values
2046 * are treated as milliseconds, and converted to jiffies when they are stored.
2048 * This routine will ensure the values are within the range specified by
2049 * table->extra1 (min) and table->extra2 (max).
2051 * Returns 0 on success.
2053 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2055 void __user
*buffer
,
2056 size_t *lenp
, loff_t
*ppos
)
2058 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2059 lenp
, ppos
, HZ
, 1000l);
2063 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2065 int write
, void *data
)
2068 if (*lvalp
> LONG_MAX
/ HZ
)
2070 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2076 lval
= (unsigned long)-val
;
2079 lval
= (unsigned long)val
;
2086 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2088 int write
, void *data
)
2091 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2093 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2099 lval
= (unsigned long)-val
;
2102 lval
= (unsigned long)val
;
2104 *lvalp
= jiffies_to_clock_t(lval
);
2109 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2111 int write
, void *data
)
2114 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2120 lval
= (unsigned long)-val
;
2123 lval
= (unsigned long)val
;
2125 *lvalp
= jiffies_to_msecs(lval
);
2131 * proc_dointvec_jiffies - read a vector of integers as seconds
2132 * @table: the sysctl table
2133 * @write: %TRUE if this is a write to the sysctl file
2134 * @filp: the file structure
2135 * @buffer: the user buffer
2136 * @lenp: the size of the user buffer
2137 * @ppos: file position
2139 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2140 * values from/to the user buffer, treated as an ASCII string.
2141 * The values read are assumed to be in seconds, and are converted into
2144 * Returns 0 on success.
2146 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2147 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2149 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2150 do_proc_dointvec_jiffies_conv
,NULL
);
2154 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2155 * @table: the sysctl table
2156 * @write: %TRUE if this is a write to the sysctl file
2157 * @filp: the file structure
2158 * @buffer: the user buffer
2159 * @lenp: the size of the user buffer
2160 * @ppos: pointer to the file position
2162 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2163 * values from/to the user buffer, treated as an ASCII string.
2164 * The values read are assumed to be in 1/USER_HZ seconds, and
2165 * are converted into jiffies.
2167 * Returns 0 on success.
2169 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2170 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2172 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2173 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2177 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2178 * @table: the sysctl table
2179 * @write: %TRUE if this is a write to the sysctl file
2180 * @filp: the file structure
2181 * @buffer: the user buffer
2182 * @lenp: the size of the user buffer
2183 * @ppos: file position
2184 * @ppos: the current position in the file
2186 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2187 * values from/to the user buffer, treated as an ASCII string.
2188 * The values read are assumed to be in 1/1000 seconds, and
2189 * are converted into jiffies.
2191 * Returns 0 on success.
2193 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2194 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2196 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2197 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2200 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
2201 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2203 struct pid
*new_pid
;
2207 tmp
= pid_nr(cad_pid
);
2209 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2210 lenp
, ppos
, NULL
, NULL
);
2214 new_pid
= find_get_pid(tmp
);
2218 put_pid(xchg(&cad_pid
, new_pid
));
2222 #else /* CONFIG_PROC_FS */
2224 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2225 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2230 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2231 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2236 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2237 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2242 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2243 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2248 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2249 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2254 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2255 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2260 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2261 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2266 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2267 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2272 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2274 void __user
*buffer
,
2275 size_t *lenp
, loff_t
*ppos
)
2281 #endif /* CONFIG_PROC_FS */
2284 #ifdef CONFIG_SYSCTL_SYSCALL
2286 * General sysctl support routines
2289 /* The generic string strategy routine: */
2290 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2291 void __user
*oldval
, size_t __user
*oldlenp
,
2292 void __user
*newval
, size_t newlen
)
2294 if (!table
->data
|| !table
->maxlen
)
2297 if (oldval
&& oldlenp
) {
2299 if (get_user(bufsize
, oldlenp
))
2302 size_t len
= strlen(table
->data
), copied
;
2304 /* This shouldn't trigger for a well-formed sysctl */
2305 if (len
> table
->maxlen
)
2306 len
= table
->maxlen
;
2308 /* Copy up to a max of bufsize-1 bytes of the string */
2309 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2311 if (copy_to_user(oldval
, table
->data
, copied
) ||
2312 put_user(0, (char __user
*)(oldval
+ copied
)))
2314 if (put_user(len
, oldlenp
))
2318 if (newval
&& newlen
) {
2319 size_t len
= newlen
;
2320 if (len
> table
->maxlen
)
2321 len
= table
->maxlen
;
2322 if(copy_from_user(table
->data
, newval
, len
))
2324 if (len
== table
->maxlen
)
2326 ((char *) table
->data
)[len
] = 0;
2332 * This function makes sure that all of the integers in the vector
2333 * are between the minimum and maximum values given in the arrays
2334 * table->extra1 and table->extra2, respectively.
2336 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2337 void __user
*oldval
, size_t __user
*oldlenp
,
2338 void __user
*newval
, size_t newlen
)
2341 if (newval
&& newlen
) {
2342 int __user
*vec
= (int __user
*) newval
;
2343 int *min
= (int *) table
->extra1
;
2344 int *max
= (int *) table
->extra2
;
2348 if (newlen
% sizeof(int) != 0)
2351 if (!table
->extra1
&& !table
->extra2
)
2354 if (newlen
> table
->maxlen
)
2355 newlen
= table
->maxlen
;
2356 length
= newlen
/ sizeof(int);
2358 for (i
= 0; i
< length
; i
++) {
2360 if (get_user(value
, vec
+ i
))
2362 if (min
&& value
< min
[i
])
2364 if (max
&& value
> max
[i
])
2371 /* Strategy function to convert jiffies to seconds */
2372 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2373 void __user
*oldval
, size_t __user
*oldlenp
,
2374 void __user
*newval
, size_t newlen
)
2376 if (oldval
&& oldlenp
) {
2379 if (get_user(olen
, oldlenp
))
2384 if (olen
< sizeof(int))
2387 val
= *(int *)(table
->data
) / HZ
;
2388 if (put_user(val
, (int __user
*)oldval
))
2390 if (put_user(sizeof(int), oldlenp
))
2394 if (newval
&& newlen
) {
2396 if (newlen
!= sizeof(int))
2398 if (get_user(new, (int __user
*)newval
))
2400 *(int *)(table
->data
) = new*HZ
;
2405 /* Strategy function to convert jiffies to seconds */
2406 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2407 void __user
*oldval
, size_t __user
*oldlenp
,
2408 void __user
*newval
, size_t newlen
)
2410 if (oldval
&& oldlenp
) {
2413 if (get_user(olen
, oldlenp
))
2418 if (olen
< sizeof(int))
2421 val
= jiffies_to_msecs(*(int *)(table
->data
));
2422 if (put_user(val
, (int __user
*)oldval
))
2424 if (put_user(sizeof(int), oldlenp
))
2428 if (newval
&& newlen
) {
2430 if (newlen
!= sizeof(int))
2432 if (get_user(new, (int __user
*)newval
))
2434 *(int *)(table
->data
) = msecs_to_jiffies(new);
2441 #else /* CONFIG_SYSCTL_SYSCALL */
2444 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2446 static int msg_count
;
2447 struct __sysctl_args tmp
;
2448 int name
[CTL_MAXNAME
];
2451 /* Read in the sysctl name for better debug message logging */
2452 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2454 if (tmp
.nlen
<= 0 || tmp
.nlen
>= CTL_MAXNAME
)
2456 for (i
= 0; i
< tmp
.nlen
; i
++)
2457 if (get_user(name
[i
], tmp
.name
+ i
))
2460 /* Ignore accesses to kernel.version */
2461 if ((tmp
.nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2464 if (msg_count
< 5) {
2467 "warning: process `%s' used the removed sysctl "
2468 "system call with ", current
->comm
);
2469 for (i
= 0; i
< tmp
.nlen
; i
++)
2470 printk("%d.", name
[i
]);
2477 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2478 void __user
*oldval
, size_t __user
*oldlenp
,
2479 void __user
*newval
, size_t newlen
)
2484 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2485 void __user
*oldval
, size_t __user
*oldlenp
,
2486 void __user
*newval
, size_t newlen
)
2491 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2492 void __user
*oldval
, size_t __user
*oldlenp
,
2493 void __user
*newval
, size_t newlen
)
2498 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2499 void __user
*oldval
, size_t __user
*oldlenp
,
2500 void __user
*newval
, size_t newlen
)
2505 #endif /* CONFIG_SYSCTL_SYSCALL */
2508 * No sense putting this after each symbol definition, twice,
2509 * exception granted :-)
2511 EXPORT_SYMBOL(proc_dointvec
);
2512 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2513 EXPORT_SYMBOL(proc_dointvec_minmax
);
2514 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2515 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2516 EXPORT_SYMBOL(proc_dostring
);
2517 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2518 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2519 EXPORT_SYMBOL(register_sysctl_table
);
2520 EXPORT_SYMBOL(sysctl_intvec
);
2521 EXPORT_SYMBOL(sysctl_jiffies
);
2522 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2523 EXPORT_SYMBOL(sysctl_string
);
2524 EXPORT_SYMBOL(unregister_sysctl_table
);