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
*);
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
);
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
);
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
);
1247 if (!use_table(head
))
1250 spin_unlock(&sysctl_lock
);
1252 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1253 newval
, newlen
, head
->ctl_table
);
1255 spin_lock(&sysctl_lock
);
1257 if (error
!= -ENOTDIR
)
1259 } while ((tmp
= tmp
->next
) != &root_table_header
.ctl_entry
);
1260 spin_unlock(&sysctl_lock
);
1264 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1266 struct __sysctl_args tmp
;
1269 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1273 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1274 tmp
.newval
, tmp
.newlen
);
1278 #endif /* CONFIG_SYSCTL_SYSCALL */
1281 * ctl_perm does NOT grant the superuser all rights automatically, because
1282 * some sysctl variables are readonly even to root.
1285 static int test_perm(int mode
, int op
)
1289 else if (in_egroup_p(0))
1291 if ((mode
& op
& 0007) == op
)
1296 static inline int ctl_perm(ctl_table
*table
, int op
)
1299 error
= security_sysctl(table
, op
);
1302 return test_perm(table
->mode
, op
);
1305 #ifdef CONFIG_SYSCTL_SYSCALL
1306 static int parse_table(int __user
*name
, int nlen
,
1307 void __user
*oldval
, size_t __user
*oldlenp
,
1308 void __user
*newval
, size_t newlen
,
1315 if (get_user(n
, name
))
1317 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1318 if (!table
->ctl_name
)
1320 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1323 if (ctl_perm(table
, 001))
1325 if (table
->strategy
) {
1326 error
= table
->strategy(
1335 table
= table
->child
;
1338 error
= do_sysctl_strategy(table
, name
, nlen
,
1347 /* Perform the actual read/write of a sysctl table entry. */
1348 int do_sysctl_strategy (ctl_table
*table
,
1349 int __user
*name
, int nlen
,
1350 void __user
*oldval
, size_t __user
*oldlenp
,
1351 void __user
*newval
, size_t newlen
)
1360 if (ctl_perm(table
, op
))
1363 if (table
->strategy
) {
1364 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1372 /* If there is no strategy routine, or if the strategy returns
1373 * zero, proceed with automatic r/w */
1374 if (table
->data
&& table
->maxlen
) {
1375 if (oldval
&& oldlenp
) {
1376 if (get_user(len
, oldlenp
))
1379 if (len
> table
->maxlen
)
1380 len
= table
->maxlen
;
1381 if(copy_to_user(oldval
, table
->data
, len
))
1383 if(put_user(len
, oldlenp
))
1387 if (newval
&& newlen
) {
1389 if (len
> table
->maxlen
)
1390 len
= table
->maxlen
;
1391 if(copy_from_user(table
->data
, newval
, len
))
1397 #endif /* CONFIG_SYSCTL_SYSCALL */
1400 * register_sysctl_table - register a sysctl hierarchy
1401 * @table: the top-level table structure
1402 * @insert_at_head: whether the entry should be inserted in front or at the end
1404 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1405 * array. An entry with a ctl_name of 0 terminates the table.
1407 * The members of the &ctl_table structure are used as follows:
1409 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1410 * must be unique within that level of sysctl
1412 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1413 * enter a sysctl file
1415 * data - a pointer to data for use by proc_handler
1417 * maxlen - the maximum size in bytes of the data
1419 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1421 * child - a pointer to the child sysctl table if this entry is a directory, or
1424 * proc_handler - the text handler routine (described below)
1426 * strategy - the strategy routine (described below)
1428 * de - for internal use by the sysctl routines
1430 * extra1, extra2 - extra pointers usable by the proc handler routines
1432 * Leaf nodes in the sysctl tree will be represented by a single file
1433 * under /proc; non-leaf nodes will be represented by directories.
1435 * sysctl(2) can automatically manage read and write requests through
1436 * the sysctl table. The data and maxlen fields of the ctl_table
1437 * struct enable minimal validation of the values being written to be
1438 * performed, and the mode field allows minimal authentication.
1440 * More sophisticated management can be enabled by the provision of a
1441 * strategy routine with the table entry. This will be called before
1442 * any automatic read or write of the data is performed.
1444 * The strategy routine may return
1446 * < 0 - Error occurred (error is passed to user process)
1448 * 0 - OK - proceed with automatic read or write.
1450 * > 0 - OK - read or write has been done by the strategy routine, so
1451 * return immediately.
1453 * There must be a proc_handler routine for any terminal nodes
1454 * mirrored under /proc/sys (non-terminals are handled by a built-in
1455 * directory handler). Several default handlers are available to
1456 * cover common cases -
1458 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1459 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1460 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1462 * It is the handler's job to read the input buffer from user memory
1463 * and process it. The handler should return 0 on success.
1465 * This routine returns %NULL on a failure to register, and a pointer
1466 * to the table header on success.
1468 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1471 struct ctl_table_header
*tmp
;
1472 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1475 tmp
->ctl_table
= table
;
1476 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1478 tmp
->unregistering
= NULL
;
1479 spin_lock(&sysctl_lock
);
1481 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1483 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1484 spin_unlock(&sysctl_lock
);
1485 #ifdef CONFIG_PROC_SYSCTL
1486 register_proc_table(table
, proc_sys_root
, tmp
);
1492 * unregister_sysctl_table - unregister a sysctl table hierarchy
1493 * @header: the header returned from register_sysctl_table
1495 * Unregisters the sysctl table and all children. proc entries may not
1496 * actually be removed until they are no longer used by anyone.
1498 void unregister_sysctl_table(struct ctl_table_header
* header
)
1501 spin_lock(&sysctl_lock
);
1502 start_unregistering(header
);
1503 #ifdef CONFIG_PROC_SYSCTL
1504 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1506 spin_unlock(&sysctl_lock
);
1510 #else /* !CONFIG_SYSCTL */
1511 struct ctl_table_header
* register_sysctl_table(ctl_table
* table
,
1517 void unregister_sysctl_table(struct ctl_table_header
* table
)
1521 #endif /* CONFIG_SYSCTL */
1527 #ifdef CONFIG_PROC_SYSCTL
1529 /* Scan the sysctl entries in table and add them all into /proc */
1530 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
, void *set
)
1532 struct proc_dir_entry
*de
;
1536 for (; table
->ctl_name
|| table
->procname
; table
++) {
1537 /* Can't do anything without a proc name. */
1538 if (!table
->procname
)
1540 /* Maybe we can't do anything with it... */
1541 if (!table
->proc_handler
&& !table
->child
) {
1542 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1547 len
= strlen(table
->procname
);
1551 if (table
->proc_handler
)
1555 for (de
= root
->subdir
; de
; de
= de
->next
) {
1556 if (proc_match(len
, table
->procname
, de
))
1559 /* If the subdir exists already, de is non-NULL */
1563 de
= create_proc_entry(table
->procname
, mode
, root
);
1567 de
->data
= (void *) table
;
1568 if (table
->proc_handler
)
1569 de
->proc_fops
= &proc_sys_file_operations
;
1572 if (de
->mode
& S_IFDIR
)
1573 register_proc_table(table
->child
, de
, set
);
1578 * Unregister a /proc sysctl table and any subdirectories.
1580 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1582 struct proc_dir_entry
*de
;
1583 for (; table
->ctl_name
|| table
->procname
; table
++) {
1584 if (!(de
= table
->de
))
1586 if (de
->mode
& S_IFDIR
) {
1587 if (!table
->child
) {
1588 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1591 unregister_proc_table(table
->child
, de
);
1593 /* Don't unregister directories which still have entries.. */
1599 * In any case, mark the entry as goner; we'll keep it
1600 * around if it's busy, but we'll know to do nothing with
1601 * its fields. We are under sysctl_lock here.
1605 /* Don't unregister proc entries that are still being used.. */
1606 if (atomic_read(&de
->count
))
1610 remove_proc_entry(table
->procname
, root
);
1614 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1615 size_t count
, loff_t
*ppos
)
1618 struct proc_dir_entry
*de
= PDE(file
->f_path
.dentry
->d_inode
);
1619 struct ctl_table
*table
;
1621 ssize_t error
= -ENOTDIR
;
1623 spin_lock(&sysctl_lock
);
1624 if (de
&& de
->data
&& use_table(de
->set
)) {
1626 * at that point we know that sysctl was not unregistered
1627 * and won't be until we finish
1629 spin_unlock(&sysctl_lock
);
1630 table
= (struct ctl_table
*) de
->data
;
1631 if (!table
|| !table
->proc_handler
)
1634 op
= (write
? 002 : 004);
1635 if (ctl_perm(table
, op
))
1638 /* careful: calling conventions are nasty here */
1640 error
= (*table
->proc_handler
)(table
, write
, file
,
1645 spin_lock(&sysctl_lock
);
1646 unuse_table(de
->set
);
1648 spin_unlock(&sysctl_lock
);
1652 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1654 if (file
->f_mode
& FMODE_WRITE
) {
1656 * sysctl entries that are not writable,
1657 * are _NOT_ writable, capabilities or not.
1659 if (!(inode
->i_mode
& S_IWUSR
))
1666 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1667 size_t count
, loff_t
*ppos
)
1669 return do_rw_proc(0, file
, buf
, count
, ppos
);
1672 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1673 size_t count
, loff_t
*ppos
)
1675 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1678 static int _proc_do_string(void* data
, int maxlen
, int write
,
1679 struct file
*filp
, void __user
*buffer
,
1680 size_t *lenp
, loff_t
*ppos
)
1686 if (!data
|| !maxlen
|| !*lenp
||
1687 (*ppos
&& !write
)) {
1695 while (len
< *lenp
) {
1696 if (get_user(c
, p
++))
1698 if (c
== 0 || c
== '\n')
1704 if(copy_from_user(data
, buffer
, len
))
1706 ((char *) data
)[len
] = 0;
1715 if(copy_to_user(buffer
, data
, len
))
1718 if(put_user('\n', ((char __user
*) buffer
) + len
))
1729 * proc_dostring - read a string sysctl
1730 * @table: the sysctl table
1731 * @write: %TRUE if this is a write to the sysctl file
1732 * @filp: the file structure
1733 * @buffer: the user buffer
1734 * @lenp: the size of the user buffer
1735 * @ppos: file position
1737 * Reads/writes a string from/to the user buffer. If the kernel
1738 * buffer provided is not large enough to hold the string, the
1739 * string is truncated. The copied string is %NULL-terminated.
1740 * If the string is being read by the user process, it is copied
1741 * and a newline '\n' is added. It is truncated if the buffer is
1744 * Returns 0 on success.
1746 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1747 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1749 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1750 buffer
, lenp
, ppos
);
1754 * Special case of dostring for the UTS structure. This has locks
1755 * to observe. Should this be in kernel/sys.c ????
1758 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
1759 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1763 which
= get_uts(table
, write
);
1764 r
= _proc_do_string(which
, table
->maxlen
,write
,filp
,buffer
,lenp
, ppos
);
1765 put_uts(table
, write
, which
);
1769 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1771 int write
, void *data
)
1774 *valp
= *negp
? -*lvalp
: *lvalp
;
1779 *lvalp
= (unsigned long)-val
;
1782 *lvalp
= (unsigned long)val
;
1788 static int __do_proc_dointvec(void *tbl_data
, ctl_table
*table
,
1789 int write
, struct file
*filp
, void __user
*buffer
,
1790 size_t *lenp
, loff_t
*ppos
,
1791 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1792 int write
, void *data
),
1795 #define TMPBUFLEN 21
1796 int *i
, vleft
, first
=1, neg
, val
;
1800 char buf
[TMPBUFLEN
], *p
;
1801 char __user
*s
= buffer
;
1803 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1804 (*ppos
&& !write
)) {
1809 i
= (int *) tbl_data
;
1810 vleft
= table
->maxlen
/ sizeof(*i
);
1814 conv
= do_proc_dointvec_conv
;
1816 for (; left
&& vleft
--; i
++, first
=0) {
1831 if (len
> sizeof(buf
) - 1)
1832 len
= sizeof(buf
) - 1;
1833 if (copy_from_user(buf
, s
, len
))
1837 if (*p
== '-' && left
> 1) {
1841 if (*p
< '0' || *p
> '9')
1844 lval
= simple_strtoul(p
, &p
, 0);
1847 if ((len
< left
) && *p
&& !isspace(*p
))
1854 if (conv(&neg
, &lval
, i
, 1, data
))
1861 if (conv(&neg
, &lval
, i
, 0, data
))
1864 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1868 if(copy_to_user(s
, buf
, len
))
1875 if (!write
&& !first
&& left
) {
1876 if(put_user('\n', s
))
1883 if (get_user(c
, s
++))
1898 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1899 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1900 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1901 int write
, void *data
),
1904 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
1905 buffer
, lenp
, ppos
, conv
, data
);
1909 * proc_dointvec - read a vector of integers
1910 * @table: the sysctl table
1911 * @write: %TRUE if this is a write to the sysctl file
1912 * @filp: the file structure
1913 * @buffer: the user buffer
1914 * @lenp: the size of the user buffer
1915 * @ppos: file position
1917 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1918 * values from/to the user buffer, treated as an ASCII string.
1920 * Returns 0 on success.
1922 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1923 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1925 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1932 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1934 int write
, void *data
)
1936 int op
= *(int *)data
;
1938 int val
= *negp
? -*lvalp
: *lvalp
;
1940 case OP_SET
: *valp
= val
; break;
1941 case OP_AND
: *valp
&= val
; break;
1947 *lvalp
= (unsigned long)-val
;
1950 *lvalp
= (unsigned long)val
;
1957 * init may raise the set.
1960 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1961 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1965 if (!capable(CAP_SYS_MODULE
)) {
1969 op
= is_init(current
) ? OP_SET
: OP_AND
;
1970 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1971 do_proc_dointvec_bset_conv
,&op
);
1974 struct do_proc_dointvec_minmax_conv_param
{
1979 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1981 int write
, void *data
)
1983 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1985 int val
= *negp
? -*lvalp
: *lvalp
;
1986 if ((param
->min
&& *param
->min
> val
) ||
1987 (param
->max
&& *param
->max
< val
))
1994 *lvalp
= (unsigned long)-val
;
1997 *lvalp
= (unsigned long)val
;
2004 * proc_dointvec_minmax - read a vector of integers with min/max values
2005 * @table: the sysctl table
2006 * @write: %TRUE if this is a write to the sysctl file
2007 * @filp: the file structure
2008 * @buffer: the user buffer
2009 * @lenp: the size of the user buffer
2010 * @ppos: file position
2012 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2013 * values from/to the user buffer, treated as an ASCII string.
2015 * This routine will ensure the values are within the range specified by
2016 * table->extra1 (min) and table->extra2 (max).
2018 * Returns 0 on success.
2020 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2021 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2023 struct do_proc_dointvec_minmax_conv_param param
= {
2024 .min
= (int *) table
->extra1
,
2025 .max
= (int *) table
->extra2
,
2027 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2028 do_proc_dointvec_minmax_conv
, ¶m
);
2031 static int __do_proc_doulongvec_minmax(void *data
, ctl_table
*table
, int write
,
2033 void __user
*buffer
,
2034 size_t *lenp
, loff_t
*ppos
,
2035 unsigned long convmul
,
2036 unsigned long convdiv
)
2038 #define TMPBUFLEN 21
2039 unsigned long *i
, *min
, *max
, val
;
2040 int vleft
, first
=1, neg
;
2042 char buf
[TMPBUFLEN
], *p
;
2043 char __user
*s
= buffer
;
2045 if (!data
|| !table
->maxlen
|| !*lenp
||
2046 (*ppos
&& !write
)) {
2051 i
= (unsigned long *) data
;
2052 min
= (unsigned long *) table
->extra1
;
2053 max
= (unsigned long *) table
->extra2
;
2054 vleft
= table
->maxlen
/ sizeof(unsigned long);
2057 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2072 if (len
> TMPBUFLEN
-1)
2074 if (copy_from_user(buf
, s
, len
))
2078 if (*p
== '-' && left
> 1) {
2082 if (*p
< '0' || *p
> '9')
2084 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2086 if ((len
< left
) && *p
&& !isspace(*p
))
2095 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2102 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2106 if(copy_to_user(s
, buf
, len
))
2113 if (!write
&& !first
&& left
) {
2114 if(put_user('\n', s
))
2121 if (get_user(c
, s
++))
2136 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
2138 void __user
*buffer
,
2139 size_t *lenp
, loff_t
*ppos
,
2140 unsigned long convmul
,
2141 unsigned long convdiv
)
2143 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2144 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2148 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2149 * @table: the sysctl table
2150 * @write: %TRUE if this is a write to the sysctl file
2151 * @filp: the file structure
2152 * @buffer: the user buffer
2153 * @lenp: the size of the user buffer
2154 * @ppos: file position
2156 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2157 * values from/to the user buffer, treated as an ASCII string.
2159 * This routine will ensure the values are within the range specified by
2160 * table->extra1 (min) and table->extra2 (max).
2162 * Returns 0 on success.
2164 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2165 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2167 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2171 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2172 * @table: the sysctl table
2173 * @write: %TRUE if this is a write to the sysctl file
2174 * @filp: the file structure
2175 * @buffer: the user buffer
2176 * @lenp: the size of the user buffer
2177 * @ppos: file position
2179 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2180 * values from/to the user buffer, treated as an ASCII string. The values
2181 * are treated as milliseconds, and converted to jiffies when they are stored.
2183 * This routine will ensure the values are within the range specified by
2184 * table->extra1 (min) and table->extra2 (max).
2186 * Returns 0 on success.
2188 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2190 void __user
*buffer
,
2191 size_t *lenp
, loff_t
*ppos
)
2193 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2194 lenp
, ppos
, HZ
, 1000l);
2198 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2200 int write
, void *data
)
2203 if (*lvalp
> LONG_MAX
/ HZ
)
2205 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2211 lval
= (unsigned long)-val
;
2214 lval
= (unsigned long)val
;
2221 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2223 int write
, void *data
)
2226 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2228 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2234 lval
= (unsigned long)-val
;
2237 lval
= (unsigned long)val
;
2239 *lvalp
= jiffies_to_clock_t(lval
);
2244 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2246 int write
, void *data
)
2249 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2255 lval
= (unsigned long)-val
;
2258 lval
= (unsigned long)val
;
2260 *lvalp
= jiffies_to_msecs(lval
);
2266 * proc_dointvec_jiffies - read a vector of integers as seconds
2267 * @table: the sysctl table
2268 * @write: %TRUE if this is a write to the sysctl file
2269 * @filp: the file structure
2270 * @buffer: the user buffer
2271 * @lenp: the size of the user buffer
2272 * @ppos: file position
2274 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2275 * values from/to the user buffer, treated as an ASCII string.
2276 * The values read are assumed to be in seconds, and are converted into
2279 * Returns 0 on success.
2281 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2282 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2284 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2285 do_proc_dointvec_jiffies_conv
,NULL
);
2289 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2290 * @table: the sysctl table
2291 * @write: %TRUE if this is a write to the sysctl file
2292 * @filp: the file structure
2293 * @buffer: the user buffer
2294 * @lenp: the size of the user buffer
2295 * @ppos: pointer to the file position
2297 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2298 * values from/to the user buffer, treated as an ASCII string.
2299 * The values read are assumed to be in 1/USER_HZ seconds, and
2300 * are converted into jiffies.
2302 * Returns 0 on success.
2304 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2305 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2307 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2308 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2312 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2313 * @table: the sysctl table
2314 * @write: %TRUE if this is a write to the sysctl file
2315 * @filp: the file structure
2316 * @buffer: the user buffer
2317 * @lenp: the size of the user buffer
2318 * @ppos: file position
2319 * @ppos: the current position in the file
2321 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2322 * values from/to the user buffer, treated as an ASCII string.
2323 * The values read are assumed to be in 1/1000 seconds, and
2324 * are converted into jiffies.
2326 * Returns 0 on success.
2328 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2329 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2331 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2332 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2335 #ifdef CONFIG_SYSVIPC
2336 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2337 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2340 which
= get_ipc(table
, write
);
2341 return __do_proc_dointvec(which
, table
, write
, filp
, buffer
,
2342 lenp
, ppos
, NULL
, NULL
);
2345 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
2346 struct file
*filp
, void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2349 which
= get_ipc(table
, write
);
2350 return __do_proc_doulongvec_minmax(which
, table
, write
, filp
, buffer
,
2351 lenp
, ppos
, 1l, 1l);
2356 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
2357 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2359 struct pid
*new_pid
;
2363 tmp
= pid_nr(cad_pid
);
2365 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2366 lenp
, ppos
, NULL
, NULL
);
2370 new_pid
= find_get_pid(tmp
);
2374 put_pid(xchg(&cad_pid
, new_pid
));
2378 #else /* CONFIG_PROC_FS */
2380 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2381 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2386 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
2387 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2392 #ifdef CONFIG_SYSVIPC
2393 static int proc_do_ipc_string(ctl_table
*table
, int write
, struct file
*filp
,
2394 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2398 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2399 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2403 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
2404 struct file
*filp
, void __user
*buffer
,
2405 size_t *lenp
, loff_t
*ppos
)
2411 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2412 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2417 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2418 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2423 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2424 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2429 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2430 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2435 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2436 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2441 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2442 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2447 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2448 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2453 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2455 void __user
*buffer
,
2456 size_t *lenp
, loff_t
*ppos
)
2462 #endif /* CONFIG_PROC_FS */
2465 #ifdef CONFIG_SYSCTL_SYSCALL
2467 * General sysctl support routines
2470 /* The generic string strategy routine: */
2471 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2472 void __user
*oldval
, size_t __user
*oldlenp
,
2473 void __user
*newval
, size_t newlen
)
2475 if (!table
->data
|| !table
->maxlen
)
2478 if (oldval
&& oldlenp
) {
2480 if (get_user(bufsize
, oldlenp
))
2483 size_t len
= strlen(table
->data
), copied
;
2485 /* This shouldn't trigger for a well-formed sysctl */
2486 if (len
> table
->maxlen
)
2487 len
= table
->maxlen
;
2489 /* Copy up to a max of bufsize-1 bytes of the string */
2490 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2492 if (copy_to_user(oldval
, table
->data
, copied
) ||
2493 put_user(0, (char __user
*)(oldval
+ copied
)))
2495 if (put_user(len
, oldlenp
))
2499 if (newval
&& newlen
) {
2500 size_t len
= newlen
;
2501 if (len
> table
->maxlen
)
2502 len
= table
->maxlen
;
2503 if(copy_from_user(table
->data
, newval
, len
))
2505 if (len
== table
->maxlen
)
2507 ((char *) table
->data
)[len
] = 0;
2513 * This function makes sure that all of the integers in the vector
2514 * are between the minimum and maximum values given in the arrays
2515 * table->extra1 and table->extra2, respectively.
2517 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2518 void __user
*oldval
, size_t __user
*oldlenp
,
2519 void __user
*newval
, size_t newlen
)
2522 if (newval
&& newlen
) {
2523 int __user
*vec
= (int __user
*) newval
;
2524 int *min
= (int *) table
->extra1
;
2525 int *max
= (int *) table
->extra2
;
2529 if (newlen
% sizeof(int) != 0)
2532 if (!table
->extra1
&& !table
->extra2
)
2535 if (newlen
> table
->maxlen
)
2536 newlen
= table
->maxlen
;
2537 length
= newlen
/ sizeof(int);
2539 for (i
= 0; i
< length
; i
++) {
2541 if (get_user(value
, vec
+ i
))
2543 if (min
&& value
< min
[i
])
2545 if (max
&& value
> max
[i
])
2552 /* Strategy function to convert jiffies to seconds */
2553 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2554 void __user
*oldval
, size_t __user
*oldlenp
,
2555 void __user
*newval
, size_t newlen
)
2560 if (get_user(olen
, oldlenp
))
2562 if (olen
!=sizeof(int))
2565 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2566 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2569 if (newval
&& newlen
) {
2571 if (newlen
!= sizeof(int))
2573 if (get_user(new, (int __user
*)newval
))
2575 *(int *)(table
->data
) = new*HZ
;
2580 /* Strategy function to convert jiffies to seconds */
2581 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2582 void __user
*oldval
, size_t __user
*oldlenp
,
2583 void __user
*newval
, size_t newlen
)
2588 if (get_user(olen
, oldlenp
))
2590 if (olen
!=sizeof(int))
2593 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2594 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2597 if (newval
&& newlen
) {
2599 if (newlen
!= sizeof(int))
2601 if (get_user(new, (int __user
*)newval
))
2603 *(int *)(table
->data
) = msecs_to_jiffies(new);
2609 /* The generic string strategy routine: */
2610 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
2611 void __user
*oldval
, size_t __user
*oldlenp
,
2612 void __user
*newval
, size_t newlen
)
2614 struct ctl_table uts_table
;
2616 write
= newval
&& newlen
;
2617 memcpy(&uts_table
, table
, sizeof(uts_table
));
2618 uts_table
.data
= get_uts(table
, write
);
2619 r
= sysctl_string(&uts_table
, name
, nlen
,
2620 oldval
, oldlenp
, newval
, newlen
);
2621 put_uts(table
, write
, uts_table
.data
);
2625 #ifdef CONFIG_SYSVIPC
2626 /* The generic sysctl ipc data routine. */
2627 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
2628 void __user
*oldval
, size_t __user
*oldlenp
,
2629 void __user
*newval
, size_t newlen
)
2634 /* Get out of I don't have a variable */
2635 if (!table
->data
|| !table
->maxlen
)
2638 data
= get_ipc(table
, 1);
2642 if (oldval
&& oldlenp
) {
2643 if (get_user(len
, oldlenp
))
2646 if (len
> table
->maxlen
)
2647 len
= table
->maxlen
;
2648 if (copy_to_user(oldval
, data
, len
))
2650 if (put_user(len
, oldlenp
))
2655 if (newval
&& newlen
) {
2656 if (newlen
> table
->maxlen
)
2657 newlen
= table
->maxlen
;
2659 if (copy_from_user(data
, newval
, newlen
))
2666 #else /* CONFIG_SYSCTL_SYSCALL */
2669 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2671 static int msg_count
;
2672 struct __sysctl_args tmp
;
2673 int name
[CTL_MAXNAME
];
2676 /* Read in the sysctl name for better debug message logging */
2677 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2679 if (tmp
.nlen
<= 0 || tmp
.nlen
>= CTL_MAXNAME
)
2681 for (i
= 0; i
< tmp
.nlen
; i
++)
2682 if (get_user(name
[i
], tmp
.name
+ i
))
2685 /* Ignore accesses to kernel.version */
2686 if ((tmp
.nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2689 if (msg_count
< 5) {
2692 "warning: process `%s' used the removed sysctl "
2693 "system call with ", current
->comm
);
2694 for (i
= 0; i
< tmp
.nlen
; i
++)
2695 printk("%d.", name
[i
]);
2702 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2703 void __user
*oldval
, size_t __user
*oldlenp
,
2704 void __user
*newval
, size_t newlen
)
2709 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2710 void __user
*oldval
, size_t __user
*oldlenp
,
2711 void __user
*newval
, size_t newlen
)
2716 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2717 void __user
*oldval
, size_t __user
*oldlenp
,
2718 void __user
*newval
, size_t newlen
)
2723 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2724 void __user
*oldval
, size_t __user
*oldlenp
,
2725 void __user
*newval
, size_t newlen
)
2730 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
2731 void __user
*oldval
, size_t __user
*oldlenp
,
2732 void __user
*newval
, size_t newlen
)
2736 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
2737 void __user
*oldval
, size_t __user
*oldlenp
,
2738 void __user
*newval
, size_t newlen
)
2742 #endif /* CONFIG_SYSCTL_SYSCALL */
2745 * No sense putting this after each symbol definition, twice,
2746 * exception granted :-)
2748 EXPORT_SYMBOL(proc_dointvec
);
2749 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2750 EXPORT_SYMBOL(proc_dointvec_minmax
);
2751 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2752 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2753 EXPORT_SYMBOL(proc_dostring
);
2754 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2755 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2756 EXPORT_SYMBOL(register_sysctl_table
);
2757 EXPORT_SYMBOL(sysctl_intvec
);
2758 EXPORT_SYMBOL(sysctl_jiffies
);
2759 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2760 EXPORT_SYMBOL(sysctl_string
);
2761 EXPORT_SYMBOL(unregister_sysctl_table
);