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 sysctl_overcommit_memory
;
65 extern int sysctl_overcommit_ratio
;
66 extern int sysctl_panic_on_oom
;
67 extern int max_threads
;
68 extern int sysrq_enabled
;
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
;
81 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
82 static int maxolduid
= 65535;
84 static int min_percpu_pagelist_fract
= 8;
86 static int ngroups_max
= NGROUPS_MAX
;
89 extern char modprobe_path
[];
91 #ifdef CONFIG_CHR_DEV_SG
92 extern int sg_big_buff
;
95 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
96 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
97 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
98 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
102 extern char reboot_command
[];
103 extern int stop_a_enabled
;
104 extern int scons_pwroff
;
108 extern int pwrsw_enabled
;
109 extern int unaligned_enabled
;
113 #ifdef CONFIG_MATHEMU
114 extern int sysctl_ieee_emulation_warnings
;
116 extern int sysctl_userprocess_debug
;
117 extern int spin_retry
;
120 extern int sysctl_hz_timer
;
122 #ifdef CONFIG_BSD_PROCESS_ACCT
123 extern int acct_parm
[];
127 extern int no_unaligned_warning
;
130 #ifdef CONFIG_RT_MUTEXES
131 extern int max_lock_depth
;
134 #ifdef CONFIG_SYSCTL_SYSCALL
135 static int parse_table(int __user
*, int, void __user
*, size_t __user
*,
136 void __user
*, size_t, ctl_table
*, void **);
139 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
140 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
142 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
143 void __user
*oldval
, size_t __user
*oldlenp
,
144 void __user
*newval
, size_t newlen
, void **context
);
146 #ifdef CONFIG_SYSVIPC
147 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
148 void __user
*oldval
, size_t __user
*oldlenp
,
149 void __user
*newval
, size_t newlen
, void **context
);
152 #ifdef CONFIG_PROC_SYSCTL
153 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
154 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
157 static ctl_table root_table
[];
158 static struct ctl_table_header root_table_header
=
159 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
161 static ctl_table kern_table
[];
162 static ctl_table vm_table
[];
163 static ctl_table fs_table
[];
164 static ctl_table debug_table
[];
165 static ctl_table dev_table
[];
166 extern ctl_table random_table
[];
167 #ifdef CONFIG_UNIX98_PTYS
168 extern ctl_table pty_table
[];
170 #ifdef CONFIG_INOTIFY_USER
171 extern ctl_table inotify_table
[];
174 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
175 int sysctl_legacy_va_layout
;
178 static void *get_uts(ctl_table
*table
, int write
)
180 char *which
= table
->data
;
182 struct uts_namespace
*uts_ns
= current
->nsproxy
->uts_ns
;
183 which
= (which
- (char *)&init_uts_ns
) + (char *)uts_ns
;
188 down_write(&uts_sem
);
192 static void put_uts(ctl_table
*table
, int write
, void *which
)
200 #ifdef CONFIG_SYSVIPC
201 static void *get_ipc(ctl_table
*table
, int write
)
203 char *which
= table
->data
;
204 struct ipc_namespace
*ipc_ns
= current
->nsproxy
->ipc_ns
;
205 which
= (which
- (char *)&init_ipc_ns
) + (char *)ipc_ns
;
209 #define get_ipc(T,W) ((T)->data)
212 /* /proc declarations: */
214 #ifdef CONFIG_PROC_SYSCTL
216 static ssize_t
proc_readsys(struct file
*, char __user
*, size_t, loff_t
*);
217 static ssize_t
proc_writesys(struct file
*, const char __user
*, size_t, loff_t
*);
218 static int proc_opensys(struct inode
*, struct file
*);
220 const struct file_operations proc_sys_file_operations
= {
221 .open
= proc_opensys
,
222 .read
= proc_readsys
,
223 .write
= proc_writesys
,
226 extern struct proc_dir_entry
*proc_sys_root
;
228 static void register_proc_table(ctl_table
*, struct proc_dir_entry
*, void *);
229 static void unregister_proc_table(ctl_table
*, struct proc_dir_entry
*);
232 /* The default sysctl tables: */
234 static ctl_table root_table
[] = {
236 .ctl_name
= CTL_KERN
,
237 .procname
= "kernel",
262 .ctl_name
= CTL_DEBUG
,
265 .child
= debug_table
,
277 static ctl_table kern_table
[] = {
279 .ctl_name
= KERN_OSTYPE
,
280 .procname
= "ostype",
281 .data
= init_uts_ns
.name
.sysname
,
282 .maxlen
= sizeof(init_uts_ns
.name
.sysname
),
284 .proc_handler
= &proc_do_uts_string
,
285 .strategy
= &sysctl_uts_string
,
288 .ctl_name
= KERN_OSRELEASE
,
289 .procname
= "osrelease",
290 .data
= init_uts_ns
.name
.release
,
291 .maxlen
= sizeof(init_uts_ns
.name
.release
),
293 .proc_handler
= &proc_do_uts_string
,
294 .strategy
= &sysctl_uts_string
,
297 .ctl_name
= KERN_VERSION
,
298 .procname
= "version",
299 .data
= init_uts_ns
.name
.version
,
300 .maxlen
= sizeof(init_uts_ns
.name
.version
),
302 .proc_handler
= &proc_do_uts_string
,
303 .strategy
= &sysctl_uts_string
,
306 .ctl_name
= KERN_NODENAME
,
307 .procname
= "hostname",
308 .data
= init_uts_ns
.name
.nodename
,
309 .maxlen
= sizeof(init_uts_ns
.name
.nodename
),
311 .proc_handler
= &proc_do_uts_string
,
312 .strategy
= &sysctl_uts_string
,
315 .ctl_name
= KERN_DOMAINNAME
,
316 .procname
= "domainname",
317 .data
= init_uts_ns
.name
.domainname
,
318 .maxlen
= sizeof(init_uts_ns
.name
.domainname
),
320 .proc_handler
= &proc_do_uts_string
,
321 .strategy
= &sysctl_uts_string
,
324 .ctl_name
= KERN_PANIC
,
326 .data
= &panic_timeout
,
327 .maxlen
= sizeof(int),
329 .proc_handler
= &proc_dointvec
,
332 .ctl_name
= KERN_CORE_USES_PID
,
333 .procname
= "core_uses_pid",
334 .data
= &core_uses_pid
,
335 .maxlen
= sizeof(int),
337 .proc_handler
= &proc_dointvec
,
340 .ctl_name
= KERN_CORE_PATTERN
,
341 .procname
= "core_pattern",
342 .data
= core_pattern
,
345 .proc_handler
= &proc_dostring
,
346 .strategy
= &sysctl_string
,
349 .ctl_name
= KERN_TAINTED
,
350 .procname
= "tainted",
352 .maxlen
= sizeof(int),
354 .proc_handler
= &proc_dointvec
,
357 .ctl_name
= KERN_CAP_BSET
,
358 .procname
= "cap-bound",
360 .maxlen
= sizeof(kernel_cap_t
),
362 .proc_handler
= &proc_dointvec_bset
,
364 #ifdef CONFIG_BLK_DEV_INITRD
366 .ctl_name
= KERN_REALROOTDEV
,
367 .procname
= "real-root-dev",
368 .data
= &real_root_dev
,
369 .maxlen
= sizeof(int),
371 .proc_handler
= &proc_dointvec
,
376 .ctl_name
= KERN_SPARC_REBOOT
,
377 .procname
= "reboot-cmd",
378 .data
= reboot_command
,
381 .proc_handler
= &proc_dostring
,
382 .strategy
= &sysctl_string
,
385 .ctl_name
= KERN_SPARC_STOP_A
,
386 .procname
= "stop-a",
387 .data
= &stop_a_enabled
,
388 .maxlen
= sizeof (int),
390 .proc_handler
= &proc_dointvec
,
393 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
394 .procname
= "scons-poweroff",
395 .data
= &scons_pwroff
,
396 .maxlen
= sizeof (int),
398 .proc_handler
= &proc_dointvec
,
403 .ctl_name
= KERN_HPPA_PWRSW
,
404 .procname
= "soft-power",
405 .data
= &pwrsw_enabled
,
406 .maxlen
= sizeof (int),
408 .proc_handler
= &proc_dointvec
,
411 .ctl_name
= KERN_HPPA_UNALIGNED
,
412 .procname
= "unaligned-trap",
413 .data
= &unaligned_enabled
,
414 .maxlen
= sizeof (int),
416 .proc_handler
= &proc_dointvec
,
420 .ctl_name
= KERN_CTLALTDEL
,
421 .procname
= "ctrl-alt-del",
423 .maxlen
= sizeof(int),
425 .proc_handler
= &proc_dointvec
,
428 .ctl_name
= KERN_PRINTK
,
429 .procname
= "printk",
430 .data
= &console_loglevel
,
431 .maxlen
= 4*sizeof(int),
433 .proc_handler
= &proc_dointvec
,
437 .ctl_name
= KERN_MODPROBE
,
438 .procname
= "modprobe",
439 .data
= &modprobe_path
,
440 .maxlen
= KMOD_PATH_LEN
,
442 .proc_handler
= &proc_dostring
,
443 .strategy
= &sysctl_string
,
446 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
448 .ctl_name
= KERN_HOTPLUG
,
449 .procname
= "hotplug",
450 .data
= &uevent_helper
,
451 .maxlen
= UEVENT_HELPER_PATH_LEN
,
453 .proc_handler
= &proc_dostring
,
454 .strategy
= &sysctl_string
,
457 #ifdef CONFIG_CHR_DEV_SG
459 .ctl_name
= KERN_SG_BIG_BUFF
,
460 .procname
= "sg-big-buff",
461 .data
= &sg_big_buff
,
462 .maxlen
= sizeof (int),
464 .proc_handler
= &proc_dointvec
,
467 #ifdef CONFIG_BSD_PROCESS_ACCT
469 .ctl_name
= KERN_ACCT
,
472 .maxlen
= 3*sizeof(int),
474 .proc_handler
= &proc_dointvec
,
477 #ifdef CONFIG_SYSVIPC
479 .ctl_name
= KERN_SHMMAX
,
480 .procname
= "shmmax",
481 .data
= &init_ipc_ns
.shm_ctlmax
,
482 .maxlen
= sizeof (init_ipc_ns
.shm_ctlmax
),
484 .proc_handler
= &proc_ipc_doulongvec_minmax
,
485 .strategy
= sysctl_ipc_data
,
488 .ctl_name
= KERN_SHMALL
,
489 .procname
= "shmall",
490 .data
= &init_ipc_ns
.shm_ctlall
,
491 .maxlen
= sizeof (init_ipc_ns
.shm_ctlall
),
493 .proc_handler
= &proc_ipc_doulongvec_minmax
,
494 .strategy
= sysctl_ipc_data
,
497 .ctl_name
= KERN_SHMMNI
,
498 .procname
= "shmmni",
499 .data
= &init_ipc_ns
.shm_ctlmni
,
500 .maxlen
= sizeof (init_ipc_ns
.shm_ctlmni
),
502 .proc_handler
= &proc_ipc_dointvec
,
503 .strategy
= sysctl_ipc_data
,
506 .ctl_name
= KERN_MSGMAX
,
507 .procname
= "msgmax",
508 .data
= &init_ipc_ns
.msg_ctlmax
,
509 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmax
),
511 .proc_handler
= &proc_ipc_dointvec
,
512 .strategy
= sysctl_ipc_data
,
515 .ctl_name
= KERN_MSGMNI
,
516 .procname
= "msgmni",
517 .data
= &init_ipc_ns
.msg_ctlmni
,
518 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmni
),
520 .proc_handler
= &proc_ipc_dointvec
,
521 .strategy
= sysctl_ipc_data
,
524 .ctl_name
= KERN_MSGMNB
,
525 .procname
= "msgmnb",
526 .data
= &init_ipc_ns
.msg_ctlmnb
,
527 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmnb
),
529 .proc_handler
= &proc_ipc_dointvec
,
530 .strategy
= sysctl_ipc_data
,
533 .ctl_name
= KERN_SEM
,
535 .data
= &init_ipc_ns
.sem_ctls
,
536 .maxlen
= 4*sizeof (int),
538 .proc_handler
= &proc_ipc_dointvec
,
539 .strategy
= sysctl_ipc_data
,
542 #ifdef CONFIG_MAGIC_SYSRQ
544 .ctl_name
= KERN_SYSRQ
,
546 .data
= &sysrq_enabled
,
547 .maxlen
= sizeof (int),
549 .proc_handler
= &proc_dointvec
,
552 #ifdef CONFIG_PROC_SYSCTL
554 .ctl_name
= KERN_CADPID
,
555 .procname
= "cad_pid",
557 .maxlen
= sizeof (int),
559 .proc_handler
= &proc_do_cad_pid
,
563 .ctl_name
= KERN_MAX_THREADS
,
564 .procname
= "threads-max",
565 .data
= &max_threads
,
566 .maxlen
= sizeof(int),
568 .proc_handler
= &proc_dointvec
,
571 .ctl_name
= KERN_RANDOM
,
572 .procname
= "random",
574 .child
= random_table
,
576 #ifdef CONFIG_UNIX98_PTYS
578 .ctl_name
= KERN_PTY
,
585 .ctl_name
= KERN_OVERFLOWUID
,
586 .procname
= "overflowuid",
587 .data
= &overflowuid
,
588 .maxlen
= sizeof(int),
590 .proc_handler
= &proc_dointvec_minmax
,
591 .strategy
= &sysctl_intvec
,
592 .extra1
= &minolduid
,
593 .extra2
= &maxolduid
,
596 .ctl_name
= KERN_OVERFLOWGID
,
597 .procname
= "overflowgid",
598 .data
= &overflowgid
,
599 .maxlen
= sizeof(int),
601 .proc_handler
= &proc_dointvec_minmax
,
602 .strategy
= &sysctl_intvec
,
603 .extra1
= &minolduid
,
604 .extra2
= &maxolduid
,
607 #ifdef CONFIG_MATHEMU
609 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
610 .procname
= "ieee_emulation_warnings",
611 .data
= &sysctl_ieee_emulation_warnings
,
612 .maxlen
= sizeof(int),
614 .proc_handler
= &proc_dointvec
,
617 #ifdef CONFIG_NO_IDLE_HZ
619 .ctl_name
= KERN_HZ_TIMER
,
620 .procname
= "hz_timer",
621 .data
= &sysctl_hz_timer
,
622 .maxlen
= sizeof(int),
624 .proc_handler
= &proc_dointvec
,
628 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
629 .procname
= "userprocess_debug",
630 .data
= &sysctl_userprocess_debug
,
631 .maxlen
= sizeof(int),
633 .proc_handler
= &proc_dointvec
,
637 .ctl_name
= KERN_PIDMAX
,
638 .procname
= "pid_max",
640 .maxlen
= sizeof (int),
642 .proc_handler
= &proc_dointvec_minmax
,
643 .strategy
= sysctl_intvec
,
644 .extra1
= &pid_max_min
,
645 .extra2
= &pid_max_max
,
648 .ctl_name
= KERN_PANIC_ON_OOPS
,
649 .procname
= "panic_on_oops",
650 .data
= &panic_on_oops
,
651 .maxlen
= sizeof(int),
653 .proc_handler
= &proc_dointvec
,
656 .ctl_name
= KERN_PRINTK_RATELIMIT
,
657 .procname
= "printk_ratelimit",
658 .data
= &printk_ratelimit_jiffies
,
659 .maxlen
= sizeof(int),
661 .proc_handler
= &proc_dointvec_jiffies
,
662 .strategy
= &sysctl_jiffies
,
665 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
666 .procname
= "printk_ratelimit_burst",
667 .data
= &printk_ratelimit_burst
,
668 .maxlen
= sizeof(int),
670 .proc_handler
= &proc_dointvec
,
673 .ctl_name
= KERN_NGROUPS_MAX
,
674 .procname
= "ngroups_max",
675 .data
= &ngroups_max
,
676 .maxlen
= sizeof (int),
678 .proc_handler
= &proc_dointvec
,
680 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
682 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
683 .procname
= "unknown_nmi_panic",
684 .data
= &unknown_nmi_panic
,
685 .maxlen
= sizeof (int),
687 .proc_handler
= &proc_dointvec
,
690 .ctl_name
= KERN_NMI_WATCHDOG
,
691 .procname
= "nmi_watchdog",
692 .data
= &nmi_watchdog_enabled
,
693 .maxlen
= sizeof (int),
695 .proc_handler
= &proc_nmi_enabled
,
698 #if defined(CONFIG_X86)
700 .ctl_name
= KERN_PANIC_ON_NMI
,
701 .procname
= "panic_on_unrecovered_nmi",
702 .data
= &panic_on_unrecovered_nmi
,
703 .maxlen
= sizeof(int),
705 .proc_handler
= &proc_dointvec
,
708 .ctl_name
= KERN_BOOTLOADER_TYPE
,
709 .procname
= "bootloader_type",
710 .data
= &bootloader_type
,
711 .maxlen
= sizeof (int),
713 .proc_handler
= &proc_dointvec
,
716 .ctl_name
= CTL_UNNUMBERED
,
717 .procname
= "kstack_depth_to_print",
718 .data
= &kstack_depth_to_print
,
719 .maxlen
= sizeof(int),
721 .proc_handler
= &proc_dointvec
,
724 #if defined(CONFIG_MMU)
726 .ctl_name
= KERN_RANDOMIZE
,
727 .procname
= "randomize_va_space",
728 .data
= &randomize_va_space
,
729 .maxlen
= sizeof(int),
731 .proc_handler
= &proc_dointvec
,
734 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
736 .ctl_name
= KERN_SPIN_RETRY
,
737 .procname
= "spin_retry",
739 .maxlen
= sizeof (int),
741 .proc_handler
= &proc_dointvec
,
744 #ifdef CONFIG_ACPI_SLEEP
746 .ctl_name
= KERN_ACPI_VIDEO_FLAGS
,
747 .procname
= "acpi_video_flags",
748 .data
= &acpi_video_flags
,
749 .maxlen
= sizeof (unsigned long),
751 .proc_handler
= &proc_doulongvec_minmax
,
756 .ctl_name
= KERN_IA64_UNALIGNED
,
757 .procname
= "ignore-unaligned-usertrap",
758 .data
= &no_unaligned_warning
,
759 .maxlen
= sizeof (int),
761 .proc_handler
= &proc_dointvec
,
766 .ctl_name
= KERN_COMPAT_LOG
,
767 .procname
= "compat-log",
769 .maxlen
= sizeof (int),
771 .proc_handler
= &proc_dointvec
,
774 #ifdef CONFIG_RT_MUTEXES
776 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
777 .procname
= "max_lock_depth",
778 .data
= &max_lock_depth
,
779 .maxlen
= sizeof(int),
781 .proc_handler
= &proc_dointvec
,
788 /* Constants for minimum and maximum testing in vm_table.
789 We use these as one-element integer vectors. */
791 static int one_hundred
= 100;
794 static ctl_table vm_table
[] = {
796 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
797 .procname
= "overcommit_memory",
798 .data
= &sysctl_overcommit_memory
,
799 .maxlen
= sizeof(sysctl_overcommit_memory
),
801 .proc_handler
= &proc_dointvec
,
804 .ctl_name
= VM_PANIC_ON_OOM
,
805 .procname
= "panic_on_oom",
806 .data
= &sysctl_panic_on_oom
,
807 .maxlen
= sizeof(sysctl_panic_on_oom
),
809 .proc_handler
= &proc_dointvec
,
812 .ctl_name
= VM_OVERCOMMIT_RATIO
,
813 .procname
= "overcommit_ratio",
814 .data
= &sysctl_overcommit_ratio
,
815 .maxlen
= sizeof(sysctl_overcommit_ratio
),
817 .proc_handler
= &proc_dointvec
,
820 .ctl_name
= VM_PAGE_CLUSTER
,
821 .procname
= "page-cluster",
822 .data
= &page_cluster
,
823 .maxlen
= sizeof(int),
825 .proc_handler
= &proc_dointvec
,
828 .ctl_name
= VM_DIRTY_BACKGROUND
,
829 .procname
= "dirty_background_ratio",
830 .data
= &dirty_background_ratio
,
831 .maxlen
= sizeof(dirty_background_ratio
),
833 .proc_handler
= &proc_dointvec_minmax
,
834 .strategy
= &sysctl_intvec
,
836 .extra2
= &one_hundred
,
839 .ctl_name
= VM_DIRTY_RATIO
,
840 .procname
= "dirty_ratio",
841 .data
= &vm_dirty_ratio
,
842 .maxlen
= sizeof(vm_dirty_ratio
),
844 .proc_handler
= &proc_dointvec_minmax
,
845 .strategy
= &sysctl_intvec
,
847 .extra2
= &one_hundred
,
850 .ctl_name
= VM_DIRTY_WB_CS
,
851 .procname
= "dirty_writeback_centisecs",
852 .data
= &dirty_writeback_interval
,
853 .maxlen
= sizeof(dirty_writeback_interval
),
855 .proc_handler
= &dirty_writeback_centisecs_handler
,
858 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
859 .procname
= "dirty_expire_centisecs",
860 .data
= &dirty_expire_interval
,
861 .maxlen
= sizeof(dirty_expire_interval
),
863 .proc_handler
= &proc_dointvec_userhz_jiffies
,
866 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
867 .procname
= "nr_pdflush_threads",
868 .data
= &nr_pdflush_threads
,
869 .maxlen
= sizeof nr_pdflush_threads
,
870 .mode
= 0444 /* read-only*/,
871 .proc_handler
= &proc_dointvec
,
874 .ctl_name
= VM_SWAPPINESS
,
875 .procname
= "swappiness",
876 .data
= &vm_swappiness
,
877 .maxlen
= sizeof(vm_swappiness
),
879 .proc_handler
= &proc_dointvec_minmax
,
880 .strategy
= &sysctl_intvec
,
882 .extra2
= &one_hundred
,
884 #ifdef CONFIG_HUGETLB_PAGE
886 .ctl_name
= VM_HUGETLB_PAGES
,
887 .procname
= "nr_hugepages",
888 .data
= &max_huge_pages
,
889 .maxlen
= sizeof(unsigned long),
891 .proc_handler
= &hugetlb_sysctl_handler
,
892 .extra1
= (void *)&hugetlb_zero
,
893 .extra2
= (void *)&hugetlb_infinity
,
896 .ctl_name
= VM_HUGETLB_GROUP
,
897 .procname
= "hugetlb_shm_group",
898 .data
= &sysctl_hugetlb_shm_group
,
899 .maxlen
= sizeof(gid_t
),
901 .proc_handler
= &proc_dointvec
,
905 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
906 .procname
= "lowmem_reserve_ratio",
907 .data
= &sysctl_lowmem_reserve_ratio
,
908 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
910 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
911 .strategy
= &sysctl_intvec
,
914 .ctl_name
= VM_DROP_PAGECACHE
,
915 .procname
= "drop_caches",
916 .data
= &sysctl_drop_caches
,
917 .maxlen
= sizeof(int),
919 .proc_handler
= drop_caches_sysctl_handler
,
920 .strategy
= &sysctl_intvec
,
923 .ctl_name
= VM_MIN_FREE_KBYTES
,
924 .procname
= "min_free_kbytes",
925 .data
= &min_free_kbytes
,
926 .maxlen
= sizeof(min_free_kbytes
),
928 .proc_handler
= &min_free_kbytes_sysctl_handler
,
929 .strategy
= &sysctl_intvec
,
933 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
934 .procname
= "percpu_pagelist_fraction",
935 .data
= &percpu_pagelist_fraction
,
936 .maxlen
= sizeof(percpu_pagelist_fraction
),
938 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
939 .strategy
= &sysctl_intvec
,
940 .extra1
= &min_percpu_pagelist_fract
,
944 .ctl_name
= VM_MAX_MAP_COUNT
,
945 .procname
= "max_map_count",
946 .data
= &sysctl_max_map_count
,
947 .maxlen
= sizeof(sysctl_max_map_count
),
949 .proc_handler
= &proc_dointvec
953 .ctl_name
= VM_LAPTOP_MODE
,
954 .procname
= "laptop_mode",
955 .data
= &laptop_mode
,
956 .maxlen
= sizeof(laptop_mode
),
958 .proc_handler
= &proc_dointvec_jiffies
,
959 .strategy
= &sysctl_jiffies
,
962 .ctl_name
= VM_BLOCK_DUMP
,
963 .procname
= "block_dump",
965 .maxlen
= sizeof(block_dump
),
967 .proc_handler
= &proc_dointvec
,
968 .strategy
= &sysctl_intvec
,
972 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
973 .procname
= "vfs_cache_pressure",
974 .data
= &sysctl_vfs_cache_pressure
,
975 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
977 .proc_handler
= &proc_dointvec
,
978 .strategy
= &sysctl_intvec
,
981 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
983 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
984 .procname
= "legacy_va_layout",
985 .data
= &sysctl_legacy_va_layout
,
986 .maxlen
= sizeof(sysctl_legacy_va_layout
),
988 .proc_handler
= &proc_dointvec
,
989 .strategy
= &sysctl_intvec
,
995 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
996 .procname
= "zone_reclaim_mode",
997 .data
= &zone_reclaim_mode
,
998 .maxlen
= sizeof(zone_reclaim_mode
),
1000 .proc_handler
= &proc_dointvec
,
1001 .strategy
= &sysctl_intvec
,
1005 .ctl_name
= VM_MIN_UNMAPPED
,
1006 .procname
= "min_unmapped_ratio",
1007 .data
= &sysctl_min_unmapped_ratio
,
1008 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1010 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1011 .strategy
= &sysctl_intvec
,
1013 .extra2
= &one_hundred
,
1016 .ctl_name
= VM_MIN_SLAB
,
1017 .procname
= "min_slab_ratio",
1018 .data
= &sysctl_min_slab_ratio
,
1019 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1021 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1022 .strategy
= &sysctl_intvec
,
1024 .extra2
= &one_hundred
,
1027 #ifdef CONFIG_X86_32
1029 .ctl_name
= VM_VDSO_ENABLED
,
1030 .procname
= "vdso_enabled",
1031 .data
= &vdso_enabled
,
1032 .maxlen
= sizeof(vdso_enabled
),
1034 .proc_handler
= &proc_dointvec
,
1035 .strategy
= &sysctl_intvec
,
1042 static ctl_table fs_table
[] = {
1044 .ctl_name
= FS_NRINODE
,
1045 .procname
= "inode-nr",
1046 .data
= &inodes_stat
,
1047 .maxlen
= 2*sizeof(int),
1049 .proc_handler
= &proc_dointvec
,
1052 .ctl_name
= FS_STATINODE
,
1053 .procname
= "inode-state",
1054 .data
= &inodes_stat
,
1055 .maxlen
= 7*sizeof(int),
1057 .proc_handler
= &proc_dointvec
,
1060 .ctl_name
= FS_NRFILE
,
1061 .procname
= "file-nr",
1062 .data
= &files_stat
,
1063 .maxlen
= 3*sizeof(int),
1065 .proc_handler
= &proc_nr_files
,
1068 .ctl_name
= FS_MAXFILE
,
1069 .procname
= "file-max",
1070 .data
= &files_stat
.max_files
,
1071 .maxlen
= sizeof(int),
1073 .proc_handler
= &proc_dointvec
,
1076 .ctl_name
= FS_DENTRY
,
1077 .procname
= "dentry-state",
1078 .data
= &dentry_stat
,
1079 .maxlen
= 6*sizeof(int),
1081 .proc_handler
= &proc_dointvec
,
1084 .ctl_name
= FS_OVERFLOWUID
,
1085 .procname
= "overflowuid",
1086 .data
= &fs_overflowuid
,
1087 .maxlen
= sizeof(int),
1089 .proc_handler
= &proc_dointvec_minmax
,
1090 .strategy
= &sysctl_intvec
,
1091 .extra1
= &minolduid
,
1092 .extra2
= &maxolduid
,
1095 .ctl_name
= FS_OVERFLOWGID
,
1096 .procname
= "overflowgid",
1097 .data
= &fs_overflowgid
,
1098 .maxlen
= sizeof(int),
1100 .proc_handler
= &proc_dointvec_minmax
,
1101 .strategy
= &sysctl_intvec
,
1102 .extra1
= &minolduid
,
1103 .extra2
= &maxolduid
,
1106 .ctl_name
= FS_LEASES
,
1107 .procname
= "leases-enable",
1108 .data
= &leases_enable
,
1109 .maxlen
= sizeof(int),
1111 .proc_handler
= &proc_dointvec
,
1113 #ifdef CONFIG_DNOTIFY
1115 .ctl_name
= FS_DIR_NOTIFY
,
1116 .procname
= "dir-notify-enable",
1117 .data
= &dir_notify_enable
,
1118 .maxlen
= sizeof(int),
1120 .proc_handler
= &proc_dointvec
,
1125 .ctl_name
= FS_LEASE_TIME
,
1126 .procname
= "lease-break-time",
1127 .data
= &lease_break_time
,
1128 .maxlen
= sizeof(int),
1130 .proc_handler
= &proc_dointvec
,
1133 .ctl_name
= FS_AIO_NR
,
1134 .procname
= "aio-nr",
1136 .maxlen
= sizeof(aio_nr
),
1138 .proc_handler
= &proc_doulongvec_minmax
,
1141 .ctl_name
= FS_AIO_MAX_NR
,
1142 .procname
= "aio-max-nr",
1143 .data
= &aio_max_nr
,
1144 .maxlen
= sizeof(aio_max_nr
),
1146 .proc_handler
= &proc_doulongvec_minmax
,
1148 #ifdef CONFIG_INOTIFY_USER
1150 .ctl_name
= FS_INOTIFY
,
1151 .procname
= "inotify",
1153 .child
= inotify_table
,
1158 .ctl_name
= KERN_SETUID_DUMPABLE
,
1159 .procname
= "suid_dumpable",
1160 .data
= &suid_dumpable
,
1161 .maxlen
= sizeof(int),
1163 .proc_handler
= &proc_dointvec
,
1168 static ctl_table debug_table
[] = {
1172 static ctl_table dev_table
[] = {
1176 extern void init_irq_proc (void);
1178 static DEFINE_SPINLOCK(sysctl_lock
);
1180 /* called under sysctl_lock */
1181 static int use_table(struct ctl_table_header
*p
)
1183 if (unlikely(p
->unregistering
))
1189 /* called under sysctl_lock */
1190 static void unuse_table(struct ctl_table_header
*p
)
1193 if (unlikely(p
->unregistering
))
1194 complete(p
->unregistering
);
1197 /* called under sysctl_lock, will reacquire if has to wait */
1198 static void start_unregistering(struct ctl_table_header
*p
)
1201 * if p->used is 0, nobody will ever touch that entry again;
1202 * we'll eliminate all paths to it before dropping sysctl_lock
1204 if (unlikely(p
->used
)) {
1205 struct completion wait
;
1206 init_completion(&wait
);
1207 p
->unregistering
= &wait
;
1208 spin_unlock(&sysctl_lock
);
1209 wait_for_completion(&wait
);
1210 spin_lock(&sysctl_lock
);
1213 * do not remove from the list until nobody holds it; walking the
1214 * list in do_sysctl() relies on that.
1216 list_del_init(&p
->ctl_entry
);
1219 void __init
sysctl_init(void)
1221 #ifdef CONFIG_PROC_SYSCTL
1222 register_proc_table(root_table
, proc_sys_root
, &root_table_header
);
1227 #ifdef CONFIG_SYSCTL_SYSCALL
1228 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1229 void __user
*newval
, size_t newlen
)
1231 struct list_head
*tmp
;
1232 int error
= -ENOTDIR
;
1234 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1238 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1241 spin_lock(&sysctl_lock
);
1242 tmp
= &root_table_header
.ctl_entry
;
1244 struct ctl_table_header
*head
=
1245 list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1246 void *context
= NULL
;
1248 if (!use_table(head
))
1251 spin_unlock(&sysctl_lock
);
1253 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1254 newval
, newlen
, head
->ctl_table
,
1258 spin_lock(&sysctl_lock
);
1260 if (error
!= -ENOTDIR
)
1262 } while ((tmp
= tmp
->next
) != &root_table_header
.ctl_entry
);
1263 spin_unlock(&sysctl_lock
);
1267 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1269 struct __sysctl_args tmp
;
1272 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1276 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1277 tmp
.newval
, tmp
.newlen
);
1281 #endif /* CONFIG_SYSCTL_SYSCALL */
1284 * ctl_perm does NOT grant the superuser all rights automatically, because
1285 * some sysctl variables are readonly even to root.
1288 static int test_perm(int mode
, int op
)
1292 else if (in_egroup_p(0))
1294 if ((mode
& op
& 0007) == op
)
1299 static inline int ctl_perm(ctl_table
*table
, int op
)
1302 error
= security_sysctl(table
, op
);
1305 return test_perm(table
->mode
, op
);
1308 #ifdef CONFIG_SYSCTL_SYSCALL
1309 static int parse_table(int __user
*name
, int nlen
,
1310 void __user
*oldval
, size_t __user
*oldlenp
,
1311 void __user
*newval
, size_t newlen
,
1312 ctl_table
*table
, void **context
)
1318 if (get_user(n
, name
))
1320 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1321 if (!table
->ctl_name
)
1323 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1326 if (ctl_perm(table
, 001))
1328 if (table
->strategy
) {
1329 error
= table
->strategy(
1332 newval
, newlen
, context
);
1338 table
= table
->child
;
1341 error
= do_sysctl_strategy(table
, name
, nlen
,
1343 newval
, newlen
, context
);
1350 /* Perform the actual read/write of a sysctl table entry. */
1351 int do_sysctl_strategy (ctl_table
*table
,
1352 int __user
*name
, int nlen
,
1353 void __user
*oldval
, size_t __user
*oldlenp
,
1354 void __user
*newval
, size_t newlen
, void **context
)
1363 if (ctl_perm(table
, op
))
1366 if (table
->strategy
) {
1367 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1368 newval
, newlen
, context
);
1375 /* If there is no strategy routine, or if the strategy returns
1376 * zero, proceed with automatic r/w */
1377 if (table
->data
&& table
->maxlen
) {
1378 if (oldval
&& oldlenp
) {
1379 if (get_user(len
, oldlenp
))
1382 if (len
> table
->maxlen
)
1383 len
= table
->maxlen
;
1384 if(copy_to_user(oldval
, table
->data
, len
))
1386 if(put_user(len
, oldlenp
))
1390 if (newval
&& newlen
) {
1392 if (len
> table
->maxlen
)
1393 len
= table
->maxlen
;
1394 if(copy_from_user(table
->data
, newval
, len
))
1400 #endif /* CONFIG_SYSCTL_SYSCALL */
1403 * register_sysctl_table - register a sysctl hierarchy
1404 * @table: the top-level table structure
1405 * @insert_at_head: whether the entry should be inserted in front or at the end
1407 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1408 * array. An entry with a ctl_name of 0 terminates the table.
1410 * The members of the &ctl_table structure are used as follows:
1412 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1413 * must be unique within that level of sysctl
1415 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1416 * enter a sysctl file
1418 * data - a pointer to data for use by proc_handler
1420 * maxlen - the maximum size in bytes of the data
1422 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1424 * child - a pointer to the child sysctl table if this entry is a directory, or
1427 * proc_handler - the text handler routine (described below)
1429 * strategy - the strategy routine (described below)
1431 * de - for internal use by the sysctl routines
1433 * extra1, extra2 - extra pointers usable by the proc handler routines
1435 * Leaf nodes in the sysctl tree will be represented by a single file
1436 * under /proc; non-leaf nodes will be represented by directories.
1438 * sysctl(2) can automatically manage read and write requests through
1439 * the sysctl table. The data and maxlen fields of the ctl_table
1440 * struct enable minimal validation of the values being written to be
1441 * performed, and the mode field allows minimal authentication.
1443 * More sophisticated management can be enabled by the provision of a
1444 * strategy routine with the table entry. This will be called before
1445 * any automatic read or write of the data is performed.
1447 * The strategy routine may return
1449 * < 0 - Error occurred (error is passed to user process)
1451 * 0 - OK - proceed with automatic read or write.
1453 * > 0 - OK - read or write has been done by the strategy routine, so
1454 * return immediately.
1456 * There must be a proc_handler routine for any terminal nodes
1457 * mirrored under /proc/sys (non-terminals are handled by a built-in
1458 * directory handler). Several default handlers are available to
1459 * cover common cases -
1461 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1462 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1463 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1465 * It is the handler's job to read the input buffer from user memory
1466 * and process it. The handler should return 0 on success.
1468 * This routine returns %NULL on a failure to register, and a pointer
1469 * to the table header on success.
1471 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1474 struct ctl_table_header
*tmp
;
1475 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1478 tmp
->ctl_table
= table
;
1479 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1481 tmp
->unregistering
= NULL
;
1482 spin_lock(&sysctl_lock
);
1484 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1486 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1487 spin_unlock(&sysctl_lock
);
1488 #ifdef CONFIG_PROC_SYSCTL
1489 register_proc_table(table
, proc_sys_root
, tmp
);
1495 * unregister_sysctl_table - unregister a sysctl table hierarchy
1496 * @header: the header returned from register_sysctl_table
1498 * Unregisters the sysctl table and all children. proc entries may not
1499 * actually be removed until they are no longer used by anyone.
1501 void unregister_sysctl_table(struct ctl_table_header
* header
)
1504 spin_lock(&sysctl_lock
);
1505 start_unregistering(header
);
1506 #ifdef CONFIG_PROC_SYSCTL
1507 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1509 spin_unlock(&sysctl_lock
);
1513 #else /* !CONFIG_SYSCTL */
1514 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 /* Scan the sysctl entries in table and add them all into /proc */
1533 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
, void *set
)
1535 struct proc_dir_entry
*de
;
1539 for (; table
->ctl_name
|| table
->procname
; table
++) {
1540 /* Can't do anything without a proc name. */
1541 if (!table
->procname
)
1543 /* Maybe we can't do anything with it... */
1544 if (!table
->proc_handler
&& !table
->child
) {
1545 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1550 len
= strlen(table
->procname
);
1554 if (table
->proc_handler
)
1558 for (de
= root
->subdir
; de
; de
= de
->next
) {
1559 if (proc_match(len
, table
->procname
, de
))
1562 /* If the subdir exists already, de is non-NULL */
1566 de
= create_proc_entry(table
->procname
, mode
, root
);
1570 de
->data
= (void *) table
;
1571 if (table
->proc_handler
)
1572 de
->proc_fops
= &proc_sys_file_operations
;
1575 if (de
->mode
& S_IFDIR
)
1576 register_proc_table(table
->child
, de
, set
);
1581 * Unregister a /proc sysctl table and any subdirectories.
1583 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1585 struct proc_dir_entry
*de
;
1586 for (; table
->ctl_name
|| table
->procname
; table
++) {
1587 if (!(de
= table
->de
))
1589 if (de
->mode
& S_IFDIR
) {
1590 if (!table
->child
) {
1591 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1594 unregister_proc_table(table
->child
, de
);
1596 /* Don't unregister directories which still have entries.. */
1602 * In any case, mark the entry as goner; we'll keep it
1603 * around if it's busy, but we'll know to do nothing with
1604 * its fields. We are under sysctl_lock here.
1608 /* Don't unregister proc entries that are still being used.. */
1609 if (atomic_read(&de
->count
))
1613 remove_proc_entry(table
->procname
, root
);
1617 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1618 size_t count
, loff_t
*ppos
)
1621 struct proc_dir_entry
*de
= PDE(file
->f_path
.dentry
->d_inode
);
1622 struct ctl_table
*table
;
1624 ssize_t error
= -ENOTDIR
;
1626 spin_lock(&sysctl_lock
);
1627 if (de
&& de
->data
&& use_table(de
->set
)) {
1629 * at that point we know that sysctl was not unregistered
1630 * and won't be until we finish
1632 spin_unlock(&sysctl_lock
);
1633 table
= (struct ctl_table
*) de
->data
;
1634 if (!table
|| !table
->proc_handler
)
1637 op
= (write
? 002 : 004);
1638 if (ctl_perm(table
, op
))
1641 /* careful: calling conventions are nasty here */
1643 error
= (*table
->proc_handler
)(table
, write
, file
,
1648 spin_lock(&sysctl_lock
);
1649 unuse_table(de
->set
);
1651 spin_unlock(&sysctl_lock
);
1655 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1657 if (file
->f_mode
& FMODE_WRITE
) {
1659 * sysctl entries that are not writable,
1660 * are _NOT_ writable, capabilities or not.
1662 if (!(inode
->i_mode
& S_IWUSR
))
1669 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1670 size_t count
, loff_t
*ppos
)
1672 return do_rw_proc(0, file
, buf
, count
, ppos
);
1675 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1676 size_t count
, loff_t
*ppos
)
1678 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1681 static int _proc_do_string(void* data
, int maxlen
, int write
,
1682 struct file
*filp
, void __user
*buffer
,
1683 size_t *lenp
, loff_t
*ppos
)
1689 if (!data
|| !maxlen
|| !*lenp
||
1690 (*ppos
&& !write
)) {
1698 while (len
< *lenp
) {
1699 if (get_user(c
, p
++))
1701 if (c
== 0 || c
== '\n')
1707 if(copy_from_user(data
, buffer
, len
))
1709 ((char *) data
)[len
] = 0;
1718 if(copy_to_user(buffer
, data
, len
))
1721 if(put_user('\n', ((char __user
*) buffer
) + len
))
1732 * proc_dostring - read a string sysctl
1733 * @table: the sysctl table
1734 * @write: %TRUE if this is a write to the sysctl file
1735 * @filp: the file structure
1736 * @buffer: the user buffer
1737 * @lenp: the size of the user buffer
1738 * @ppos: file position
1740 * Reads/writes a string from/to the user buffer. If the kernel
1741 * buffer provided is not large enough to hold the string, the
1742 * string is truncated. The copied string is %NULL-terminated.
1743 * If the string is being read by the user process, it is copied
1744 * and a newline '\n' is added. It is truncated if the buffer is
1747 * Returns 0 on success.
1749 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1750 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1752 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1753 buffer
, lenp
, ppos
);
1757 * Special case of dostring for the UTS structure. This has locks
1758 * to observe. Should this be in kernel/sys.c ????
1761 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
1762 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1766 which
= get_uts(table
, write
);
1767 r
= _proc_do_string(which
, table
->maxlen
,write
,filp
,buffer
,lenp
, ppos
);
1768 put_uts(table
, write
, which
);
1772 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1774 int write
, void *data
)
1777 *valp
= *negp
? -*lvalp
: *lvalp
;
1782 *lvalp
= (unsigned long)-val
;
1785 *lvalp
= (unsigned long)val
;
1791 static int __do_proc_dointvec(void *tbl_data
, ctl_table
*table
,
1792 int write
, struct file
*filp
, void __user
*buffer
,
1793 size_t *lenp
, loff_t
*ppos
,
1794 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1795 int write
, void *data
),
1798 #define TMPBUFLEN 21
1799 int *i
, vleft
, first
=1, neg
, val
;
1803 char buf
[TMPBUFLEN
], *p
;
1804 char __user
*s
= buffer
;
1806 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1807 (*ppos
&& !write
)) {
1812 i
= (int *) tbl_data
;
1813 vleft
= table
->maxlen
/ sizeof(*i
);
1817 conv
= do_proc_dointvec_conv
;
1819 for (; left
&& vleft
--; i
++, first
=0) {
1834 if (len
> sizeof(buf
) - 1)
1835 len
= sizeof(buf
) - 1;
1836 if (copy_from_user(buf
, s
, len
))
1840 if (*p
== '-' && left
> 1) {
1844 if (*p
< '0' || *p
> '9')
1847 lval
= simple_strtoul(p
, &p
, 0);
1850 if ((len
< left
) && *p
&& !isspace(*p
))
1857 if (conv(&neg
, &lval
, i
, 1, data
))
1864 if (conv(&neg
, &lval
, i
, 0, data
))
1867 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1871 if(copy_to_user(s
, buf
, len
))
1878 if (!write
&& !first
&& left
) {
1879 if(put_user('\n', s
))
1886 if (get_user(c
, s
++))
1901 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1902 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1903 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1904 int write
, void *data
),
1907 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
1908 buffer
, lenp
, ppos
, conv
, data
);
1912 * proc_dointvec - read a vector of integers
1913 * @table: the sysctl table
1914 * @write: %TRUE if this is a write to the sysctl file
1915 * @filp: the file structure
1916 * @buffer: the user buffer
1917 * @lenp: the size of the user buffer
1918 * @ppos: file position
1920 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1921 * values from/to the user buffer, treated as an ASCII string.
1923 * Returns 0 on success.
1925 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1926 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1928 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1938 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1940 int write
, void *data
)
1942 int op
= *(int *)data
;
1944 int val
= *negp
? -*lvalp
: *lvalp
;
1946 case OP_SET
: *valp
= val
; break;
1947 case OP_AND
: *valp
&= val
; break;
1948 case OP_OR
: *valp
|= val
; break;
1949 case OP_MAX
: if(*valp
< val
)
1952 case OP_MIN
: if(*valp
> val
)
1960 *lvalp
= (unsigned long)-val
;
1963 *lvalp
= (unsigned long)val
;
1970 * init may raise the set.
1973 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1974 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1978 if (!capable(CAP_SYS_MODULE
)) {
1982 op
= is_init(current
) ? OP_SET
: OP_AND
;
1983 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1984 do_proc_dointvec_bset_conv
,&op
);
1987 struct do_proc_dointvec_minmax_conv_param
{
1992 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1994 int write
, void *data
)
1996 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1998 int val
= *negp
? -*lvalp
: *lvalp
;
1999 if ((param
->min
&& *param
->min
> val
) ||
2000 (param
->max
&& *param
->max
< val
))
2007 *lvalp
= (unsigned long)-val
;
2010 *lvalp
= (unsigned long)val
;
2017 * proc_dointvec_minmax - read a vector of integers with min/max values
2018 * @table: the sysctl table
2019 * @write: %TRUE if this is a write to the sysctl file
2020 * @filp: the file structure
2021 * @buffer: the user buffer
2022 * @lenp: the size of the user buffer
2023 * @ppos: file position
2025 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2026 * values from/to the user buffer, treated as an ASCII string.
2028 * This routine will ensure the values are within the range specified by
2029 * table->extra1 (min) and table->extra2 (max).
2031 * Returns 0 on success.
2033 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2034 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2036 struct do_proc_dointvec_minmax_conv_param param
= {
2037 .min
= (int *) table
->extra1
,
2038 .max
= (int *) table
->extra2
,
2040 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2041 do_proc_dointvec_minmax_conv
, ¶m
);
2044 static int __do_proc_doulongvec_minmax(void *data
, ctl_table
*table
, int write
,
2046 void __user
*buffer
,
2047 size_t *lenp
, loff_t
*ppos
,
2048 unsigned long convmul
,
2049 unsigned long convdiv
)
2051 #define TMPBUFLEN 21
2052 unsigned long *i
, *min
, *max
, val
;
2053 int vleft
, first
=1, neg
;
2055 char buf
[TMPBUFLEN
], *p
;
2056 char __user
*s
= buffer
;
2058 if (!data
|| !table
->maxlen
|| !*lenp
||
2059 (*ppos
&& !write
)) {
2064 i
= (unsigned long *) data
;
2065 min
= (unsigned long *) table
->extra1
;
2066 max
= (unsigned long *) table
->extra2
;
2067 vleft
= table
->maxlen
/ sizeof(unsigned long);
2070 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2085 if (len
> TMPBUFLEN
-1)
2087 if (copy_from_user(buf
, s
, len
))
2091 if (*p
== '-' && left
> 1) {
2095 if (*p
< '0' || *p
> '9')
2097 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2099 if ((len
< left
) && *p
&& !isspace(*p
))
2108 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2115 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2119 if(copy_to_user(s
, buf
, len
))
2126 if (!write
&& !first
&& left
) {
2127 if(put_user('\n', s
))
2134 if (get_user(c
, s
++))
2149 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
2151 void __user
*buffer
,
2152 size_t *lenp
, loff_t
*ppos
,
2153 unsigned long convmul
,
2154 unsigned long convdiv
)
2156 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2157 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2161 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2162 * @table: the sysctl table
2163 * @write: %TRUE if this is a write to the sysctl file
2164 * @filp: the file structure
2165 * @buffer: the user buffer
2166 * @lenp: the size of the user buffer
2167 * @ppos: file position
2169 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2170 * values from/to the user buffer, treated as an ASCII string.
2172 * This routine will ensure the values are within the range specified by
2173 * table->extra1 (min) and table->extra2 (max).
2175 * Returns 0 on success.
2177 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2178 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2180 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2184 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2185 * @table: the sysctl table
2186 * @write: %TRUE if this is a write to the sysctl file
2187 * @filp: the file structure
2188 * @buffer: the user buffer
2189 * @lenp: the size of the user buffer
2190 * @ppos: file position
2192 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2193 * values from/to the user buffer, treated as an ASCII string. The values
2194 * are treated as milliseconds, and converted to jiffies when they are stored.
2196 * This routine will ensure the values are within the range specified by
2197 * table->extra1 (min) and table->extra2 (max).
2199 * Returns 0 on success.
2201 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2203 void __user
*buffer
,
2204 size_t *lenp
, loff_t
*ppos
)
2206 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2207 lenp
, ppos
, HZ
, 1000l);
2211 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2213 int write
, void *data
)
2216 if (*lvalp
> LONG_MAX
/ HZ
)
2218 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2224 lval
= (unsigned long)-val
;
2227 lval
= (unsigned long)val
;
2234 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2236 int write
, void *data
)
2239 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2241 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2247 lval
= (unsigned long)-val
;
2250 lval
= (unsigned long)val
;
2252 *lvalp
= jiffies_to_clock_t(lval
);
2257 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2259 int write
, void *data
)
2262 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2268 lval
= (unsigned long)-val
;
2271 lval
= (unsigned long)val
;
2273 *lvalp
= jiffies_to_msecs(lval
);
2279 * proc_dointvec_jiffies - read a vector of integers as seconds
2280 * @table: the sysctl table
2281 * @write: %TRUE if this is a write to the sysctl file
2282 * @filp: the file structure
2283 * @buffer: the user buffer
2284 * @lenp: the size of the user buffer
2285 * @ppos: file position
2287 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2288 * values from/to the user buffer, treated as an ASCII string.
2289 * The values read are assumed to be in seconds, and are converted into
2292 * Returns 0 on success.
2294 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2295 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2297 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2298 do_proc_dointvec_jiffies_conv
,NULL
);
2302 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2303 * @table: the sysctl table
2304 * @write: %TRUE if this is a write to the sysctl file
2305 * @filp: the file structure
2306 * @buffer: the user buffer
2307 * @lenp: the size of the user buffer
2308 * @ppos: pointer to the file position
2310 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2311 * values from/to the user buffer, treated as an ASCII string.
2312 * The values read are assumed to be in 1/USER_HZ seconds, and
2313 * are converted into jiffies.
2315 * Returns 0 on success.
2317 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2318 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2320 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2321 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2325 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2326 * @table: the sysctl table
2327 * @write: %TRUE if this is a write to the sysctl file
2328 * @filp: the file structure
2329 * @buffer: the user buffer
2330 * @lenp: the size of the user buffer
2331 * @ppos: file position
2332 * @ppos: the current position in the file
2334 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2335 * values from/to the user buffer, treated as an ASCII string.
2336 * The values read are assumed to be in 1/1000 seconds, and
2337 * are converted into jiffies.
2339 * Returns 0 on success.
2341 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2342 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2344 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2345 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2348 #ifdef CONFIG_SYSVIPC
2349 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2350 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2353 which
= get_ipc(table
, write
);
2354 return __do_proc_dointvec(which
, table
, write
, filp
, buffer
,
2355 lenp
, ppos
, NULL
, NULL
);
2358 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
2359 struct file
*filp
, void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2362 which
= get_ipc(table
, write
);
2363 return __do_proc_doulongvec_minmax(which
, table
, write
, filp
, buffer
,
2364 lenp
, ppos
, 1l, 1l);
2369 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
2370 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2372 struct pid
*new_pid
;
2376 tmp
= pid_nr(cad_pid
);
2378 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2379 lenp
, ppos
, NULL
, NULL
);
2383 new_pid
= find_get_pid(tmp
);
2387 put_pid(xchg(&cad_pid
, new_pid
));
2391 #else /* CONFIG_PROC_FS */
2393 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2394 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2399 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
2400 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2405 #ifdef CONFIG_SYSVIPC
2406 static int proc_do_ipc_string(ctl_table
*table
, int write
, struct file
*filp
,
2407 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2411 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2412 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2416 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
2417 struct file
*filp
, void __user
*buffer
,
2418 size_t *lenp
, loff_t
*ppos
)
2424 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2425 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2430 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2431 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2436 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2437 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2442 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2443 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2448 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2449 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2454 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2455 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2460 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2461 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2466 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2468 void __user
*buffer
,
2469 size_t *lenp
, loff_t
*ppos
)
2475 #endif /* CONFIG_PROC_FS */
2478 #ifdef CONFIG_SYSCTL_SYSCALL
2480 * General sysctl support routines
2483 /* The generic string strategy routine: */
2484 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2485 void __user
*oldval
, size_t __user
*oldlenp
,
2486 void __user
*newval
, size_t newlen
, void **context
)
2488 if (!table
->data
|| !table
->maxlen
)
2491 if (oldval
&& oldlenp
) {
2493 if (get_user(bufsize
, oldlenp
))
2496 size_t len
= strlen(table
->data
), copied
;
2498 /* This shouldn't trigger for a well-formed sysctl */
2499 if (len
> table
->maxlen
)
2500 len
= table
->maxlen
;
2502 /* Copy up to a max of bufsize-1 bytes of the string */
2503 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2505 if (copy_to_user(oldval
, table
->data
, copied
) ||
2506 put_user(0, (char __user
*)(oldval
+ copied
)))
2508 if (put_user(len
, oldlenp
))
2512 if (newval
&& newlen
) {
2513 size_t len
= newlen
;
2514 if (len
> table
->maxlen
)
2515 len
= table
->maxlen
;
2516 if(copy_from_user(table
->data
, newval
, len
))
2518 if (len
== table
->maxlen
)
2520 ((char *) table
->data
)[len
] = 0;
2526 * This function makes sure that all of the integers in the vector
2527 * are between the minimum and maximum values given in the arrays
2528 * table->extra1 and table->extra2, respectively.
2530 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2531 void __user
*oldval
, size_t __user
*oldlenp
,
2532 void __user
*newval
, size_t newlen
, void **context
)
2535 if (newval
&& newlen
) {
2536 int __user
*vec
= (int __user
*) newval
;
2537 int *min
= (int *) table
->extra1
;
2538 int *max
= (int *) table
->extra2
;
2542 if (newlen
% sizeof(int) != 0)
2545 if (!table
->extra1
&& !table
->extra2
)
2548 if (newlen
> table
->maxlen
)
2549 newlen
= table
->maxlen
;
2550 length
= newlen
/ sizeof(int);
2552 for (i
= 0; i
< length
; i
++) {
2554 if (get_user(value
, vec
+ i
))
2556 if (min
&& value
< min
[i
])
2558 if (max
&& value
> max
[i
])
2565 /* Strategy function to convert jiffies to seconds */
2566 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2567 void __user
*oldval
, size_t __user
*oldlenp
,
2568 void __user
*newval
, size_t newlen
, void **context
)
2573 if (get_user(olen
, oldlenp
))
2575 if (olen
!=sizeof(int))
2578 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2579 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2582 if (newval
&& newlen
) {
2584 if (newlen
!= sizeof(int))
2586 if (get_user(new, (int __user
*)newval
))
2588 *(int *)(table
->data
) = new*HZ
;
2593 /* Strategy function to convert jiffies to seconds */
2594 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2595 void __user
*oldval
, size_t __user
*oldlenp
,
2596 void __user
*newval
, size_t newlen
, void **context
)
2601 if (get_user(olen
, oldlenp
))
2603 if (olen
!=sizeof(int))
2606 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2607 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2610 if (newval
&& newlen
) {
2612 if (newlen
!= sizeof(int))
2614 if (get_user(new, (int __user
*)newval
))
2616 *(int *)(table
->data
) = msecs_to_jiffies(new);
2622 /* The generic string strategy routine: */
2623 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
2624 void __user
*oldval
, size_t __user
*oldlenp
,
2625 void __user
*newval
, size_t newlen
, void **context
)
2627 struct ctl_table uts_table
;
2629 write
= newval
&& newlen
;
2630 memcpy(&uts_table
, table
, sizeof(uts_table
));
2631 uts_table
.data
= get_uts(table
, write
);
2632 r
= sysctl_string(&uts_table
, name
, nlen
,
2633 oldval
, oldlenp
, newval
, newlen
, context
);
2634 put_uts(table
, write
, uts_table
.data
);
2638 #ifdef CONFIG_SYSVIPC
2639 /* The generic sysctl ipc data routine. */
2640 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
2641 void __user
*oldval
, size_t __user
*oldlenp
,
2642 void __user
*newval
, size_t newlen
, void **context
)
2647 /* Get out of I don't have a variable */
2648 if (!table
->data
|| !table
->maxlen
)
2651 data
= get_ipc(table
, 1);
2655 if (oldval
&& oldlenp
) {
2656 if (get_user(len
, oldlenp
))
2659 if (len
> table
->maxlen
)
2660 len
= table
->maxlen
;
2661 if (copy_to_user(oldval
, data
, len
))
2663 if (put_user(len
, oldlenp
))
2668 if (newval
&& newlen
) {
2669 if (newlen
> table
->maxlen
)
2670 newlen
= table
->maxlen
;
2672 if (copy_from_user(data
, newval
, newlen
))
2679 #else /* CONFIG_SYSCTL_SYSCALL */
2682 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2684 static int msg_count
;
2685 struct __sysctl_args tmp
;
2686 int name
[CTL_MAXNAME
];
2689 /* Read in the sysctl name for better debug message logging */
2690 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2692 if (tmp
.nlen
<= 0 || tmp
.nlen
>= CTL_MAXNAME
)
2694 for (i
= 0; i
< tmp
.nlen
; i
++)
2695 if (get_user(name
[i
], tmp
.name
+ i
))
2698 /* Ignore accesses to kernel.version */
2699 if ((tmp
.nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2702 if (msg_count
< 5) {
2705 "warning: process `%s' used the removed sysctl "
2706 "system call with ", current
->comm
);
2707 for (i
= 0; i
< tmp
.nlen
; i
++)
2708 printk("%d.", name
[i
]);
2715 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2716 void __user
*oldval
, size_t __user
*oldlenp
,
2717 void __user
*newval
, size_t newlen
, void **context
)
2722 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2723 void __user
*oldval
, size_t __user
*oldlenp
,
2724 void __user
*newval
, size_t newlen
, void **context
)
2729 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2730 void __user
*oldval
, size_t __user
*oldlenp
,
2731 void __user
*newval
, size_t newlen
, void **context
)
2736 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2737 void __user
*oldval
, size_t __user
*oldlenp
,
2738 void __user
*newval
, size_t newlen
, void **context
)
2743 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
2744 void __user
*oldval
, size_t __user
*oldlenp
,
2745 void __user
*newval
, size_t newlen
, void **context
)
2749 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
2750 void __user
*oldval
, size_t __user
*oldlenp
,
2751 void __user
*newval
, size_t newlen
, void **context
)
2755 #endif /* CONFIG_SYSCTL_SYSCALL */
2758 * No sense putting this after each symbol definition, twice,
2759 * exception granted :-)
2761 EXPORT_SYMBOL(proc_dointvec
);
2762 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2763 EXPORT_SYMBOL(proc_dointvec_minmax
);
2764 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2765 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2766 EXPORT_SYMBOL(proc_dostring
);
2767 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2768 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2769 EXPORT_SYMBOL(register_sysctl_table
);
2770 EXPORT_SYMBOL(sysctl_intvec
);
2771 EXPORT_SYMBOL(sysctl_jiffies
);
2772 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2773 EXPORT_SYMBOL(sysctl_string
);
2774 EXPORT_SYMBOL(unregister_sysctl_table
);