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 core_uses_pid
;
69 extern int suid_dumpable
;
70 extern char core_pattern
[];
72 extern int min_free_kbytes
;
73 extern int printk_ratelimit_jiffies
;
74 extern int printk_ratelimit_burst
;
75 extern int pid_max_min
, pid_max_max
;
76 extern int sysctl_drop_caches
;
77 extern int percpu_pagelist_fraction
;
78 extern int compat_log
;
80 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
81 static int maxolduid
= 65535;
83 static int min_percpu_pagelist_fract
= 8;
85 static int ngroups_max
= NGROUPS_MAX
;
88 extern char modprobe_path
[];
90 #ifdef CONFIG_CHR_DEV_SG
91 extern int sg_big_buff
;
94 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
95 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
96 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
97 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
101 extern char reboot_command
[];
102 extern int stop_a_enabled
;
103 extern int scons_pwroff
;
107 extern int pwrsw_enabled
;
108 extern int unaligned_enabled
;
112 #ifdef CONFIG_MATHEMU
113 extern int sysctl_ieee_emulation_warnings
;
115 extern int sysctl_userprocess_debug
;
116 extern int spin_retry
;
119 extern int sysctl_hz_timer
;
121 #ifdef CONFIG_BSD_PROCESS_ACCT
122 extern int acct_parm
[];
126 extern int no_unaligned_warning
;
129 #ifdef CONFIG_RT_MUTEXES
130 extern int max_lock_depth
;
133 #ifdef CONFIG_SYSCTL_SYSCALL
134 static int parse_table(int __user
*, int, void __user
*, size_t __user
*,
135 void __user
*, size_t, ctl_table
*);
138 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
139 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
141 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
142 void __user
*oldval
, size_t __user
*oldlenp
,
143 void __user
*newval
, size_t newlen
);
145 #ifdef CONFIG_SYSVIPC
146 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
147 void __user
*oldval
, size_t __user
*oldlenp
,
148 void __user
*newval
, size_t newlen
);
151 #ifdef CONFIG_PROC_SYSCTL
152 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
156 static ctl_table root_table
[];
157 static struct ctl_table_header root_table_header
=
158 { root_table
, LIST_HEAD_INIT(root_table_header
.ctl_entry
) };
160 static ctl_table kern_table
[];
161 static ctl_table vm_table
[];
162 static ctl_table fs_table
[];
163 static ctl_table debug_table
[];
164 static ctl_table dev_table
[];
165 extern ctl_table random_table
[];
166 #ifdef CONFIG_UNIX98_PTYS
167 extern ctl_table pty_table
[];
169 #ifdef CONFIG_INOTIFY_USER
170 extern ctl_table inotify_table
[];
173 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
174 int sysctl_legacy_va_layout
;
177 static void *get_uts(ctl_table
*table
, int write
)
179 char *which
= table
->data
;
181 struct uts_namespace
*uts_ns
= current
->nsproxy
->uts_ns
;
182 which
= (which
- (char *)&init_uts_ns
) + (char *)uts_ns
;
187 down_write(&uts_sem
);
191 static void put_uts(ctl_table
*table
, int write
, void *which
)
199 #ifdef CONFIG_SYSVIPC
200 static void *get_ipc(ctl_table
*table
, int write
)
202 char *which
= table
->data
;
203 struct ipc_namespace
*ipc_ns
= current
->nsproxy
->ipc_ns
;
204 which
= (which
- (char *)&init_ipc_ns
) + (char *)ipc_ns
;
208 #define get_ipc(T,W) ((T)->data)
211 /* /proc declarations: */
213 #ifdef CONFIG_PROC_SYSCTL
215 static ssize_t
proc_readsys(struct file
*, char __user
*, size_t, loff_t
*);
216 static ssize_t
proc_writesys(struct file
*, const char __user
*, size_t, loff_t
*);
217 static int proc_opensys(struct inode
*, struct file
*);
219 const struct file_operations proc_sys_file_operations
= {
220 .open
= proc_opensys
,
221 .read
= proc_readsys
,
222 .write
= proc_writesys
,
225 extern struct proc_dir_entry
*proc_sys_root
;
227 static void register_proc_table(ctl_table
*, struct proc_dir_entry
*, void *);
228 static void unregister_proc_table(ctl_table
*, struct proc_dir_entry
*);
231 /* The default sysctl tables: */
233 static ctl_table root_table
[] = {
235 .ctl_name
= CTL_KERN
,
236 .procname
= "kernel",
261 .ctl_name
= CTL_DEBUG
,
264 .child
= debug_table
,
276 static ctl_table kern_table
[] = {
278 .ctl_name
= KERN_OSTYPE
,
279 .procname
= "ostype",
280 .data
= init_uts_ns
.name
.sysname
,
281 .maxlen
= sizeof(init_uts_ns
.name
.sysname
),
283 .proc_handler
= &proc_do_uts_string
,
284 .strategy
= &sysctl_uts_string
,
287 .ctl_name
= KERN_OSRELEASE
,
288 .procname
= "osrelease",
289 .data
= init_uts_ns
.name
.release
,
290 .maxlen
= sizeof(init_uts_ns
.name
.release
),
292 .proc_handler
= &proc_do_uts_string
,
293 .strategy
= &sysctl_uts_string
,
296 .ctl_name
= KERN_VERSION
,
297 .procname
= "version",
298 .data
= init_uts_ns
.name
.version
,
299 .maxlen
= sizeof(init_uts_ns
.name
.version
),
301 .proc_handler
= &proc_do_uts_string
,
302 .strategy
= &sysctl_uts_string
,
305 .ctl_name
= KERN_NODENAME
,
306 .procname
= "hostname",
307 .data
= init_uts_ns
.name
.nodename
,
308 .maxlen
= sizeof(init_uts_ns
.name
.nodename
),
310 .proc_handler
= &proc_do_uts_string
,
311 .strategy
= &sysctl_uts_string
,
314 .ctl_name
= KERN_DOMAINNAME
,
315 .procname
= "domainname",
316 .data
= init_uts_ns
.name
.domainname
,
317 .maxlen
= sizeof(init_uts_ns
.name
.domainname
),
319 .proc_handler
= &proc_do_uts_string
,
320 .strategy
= &sysctl_uts_string
,
323 .ctl_name
= KERN_PANIC
,
325 .data
= &panic_timeout
,
326 .maxlen
= sizeof(int),
328 .proc_handler
= &proc_dointvec
,
331 .ctl_name
= KERN_CORE_USES_PID
,
332 .procname
= "core_uses_pid",
333 .data
= &core_uses_pid
,
334 .maxlen
= sizeof(int),
336 .proc_handler
= &proc_dointvec
,
339 .ctl_name
= KERN_CORE_PATTERN
,
340 .procname
= "core_pattern",
341 .data
= core_pattern
,
344 .proc_handler
= &proc_dostring
,
345 .strategy
= &sysctl_string
,
348 .ctl_name
= KERN_TAINTED
,
349 .procname
= "tainted",
351 .maxlen
= sizeof(int),
353 .proc_handler
= &proc_dointvec
,
356 .ctl_name
= KERN_CAP_BSET
,
357 .procname
= "cap-bound",
359 .maxlen
= sizeof(kernel_cap_t
),
361 .proc_handler
= &proc_dointvec_bset
,
363 #ifdef CONFIG_BLK_DEV_INITRD
365 .ctl_name
= KERN_REALROOTDEV
,
366 .procname
= "real-root-dev",
367 .data
= &real_root_dev
,
368 .maxlen
= sizeof(int),
370 .proc_handler
= &proc_dointvec
,
375 .ctl_name
= KERN_SPARC_REBOOT
,
376 .procname
= "reboot-cmd",
377 .data
= reboot_command
,
380 .proc_handler
= &proc_dostring
,
381 .strategy
= &sysctl_string
,
384 .ctl_name
= KERN_SPARC_STOP_A
,
385 .procname
= "stop-a",
386 .data
= &stop_a_enabled
,
387 .maxlen
= sizeof (int),
389 .proc_handler
= &proc_dointvec
,
392 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
393 .procname
= "scons-poweroff",
394 .data
= &scons_pwroff
,
395 .maxlen
= sizeof (int),
397 .proc_handler
= &proc_dointvec
,
402 .ctl_name
= KERN_HPPA_PWRSW
,
403 .procname
= "soft-power",
404 .data
= &pwrsw_enabled
,
405 .maxlen
= sizeof (int),
407 .proc_handler
= &proc_dointvec
,
410 .ctl_name
= KERN_HPPA_UNALIGNED
,
411 .procname
= "unaligned-trap",
412 .data
= &unaligned_enabled
,
413 .maxlen
= sizeof (int),
415 .proc_handler
= &proc_dointvec
,
419 .ctl_name
= KERN_CTLALTDEL
,
420 .procname
= "ctrl-alt-del",
422 .maxlen
= sizeof(int),
424 .proc_handler
= &proc_dointvec
,
427 .ctl_name
= KERN_PRINTK
,
428 .procname
= "printk",
429 .data
= &console_loglevel
,
430 .maxlen
= 4*sizeof(int),
432 .proc_handler
= &proc_dointvec
,
436 .ctl_name
= KERN_MODPROBE
,
437 .procname
= "modprobe",
438 .data
= &modprobe_path
,
439 .maxlen
= KMOD_PATH_LEN
,
441 .proc_handler
= &proc_dostring
,
442 .strategy
= &sysctl_string
,
445 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
447 .ctl_name
= KERN_HOTPLUG
,
448 .procname
= "hotplug",
449 .data
= &uevent_helper
,
450 .maxlen
= UEVENT_HELPER_PATH_LEN
,
452 .proc_handler
= &proc_dostring
,
453 .strategy
= &sysctl_string
,
456 #ifdef CONFIG_CHR_DEV_SG
458 .ctl_name
= KERN_SG_BIG_BUFF
,
459 .procname
= "sg-big-buff",
460 .data
= &sg_big_buff
,
461 .maxlen
= sizeof (int),
463 .proc_handler
= &proc_dointvec
,
466 #ifdef CONFIG_BSD_PROCESS_ACCT
468 .ctl_name
= KERN_ACCT
,
471 .maxlen
= 3*sizeof(int),
473 .proc_handler
= &proc_dointvec
,
476 #ifdef CONFIG_SYSVIPC
478 .ctl_name
= KERN_SHMMAX
,
479 .procname
= "shmmax",
480 .data
= &init_ipc_ns
.shm_ctlmax
,
481 .maxlen
= sizeof (init_ipc_ns
.shm_ctlmax
),
483 .proc_handler
= &proc_ipc_doulongvec_minmax
,
484 .strategy
= sysctl_ipc_data
,
487 .ctl_name
= KERN_SHMALL
,
488 .procname
= "shmall",
489 .data
= &init_ipc_ns
.shm_ctlall
,
490 .maxlen
= sizeof (init_ipc_ns
.shm_ctlall
),
492 .proc_handler
= &proc_ipc_doulongvec_minmax
,
493 .strategy
= sysctl_ipc_data
,
496 .ctl_name
= KERN_SHMMNI
,
497 .procname
= "shmmni",
498 .data
= &init_ipc_ns
.shm_ctlmni
,
499 .maxlen
= sizeof (init_ipc_ns
.shm_ctlmni
),
501 .proc_handler
= &proc_ipc_dointvec
,
502 .strategy
= sysctl_ipc_data
,
505 .ctl_name
= KERN_MSGMAX
,
506 .procname
= "msgmax",
507 .data
= &init_ipc_ns
.msg_ctlmax
,
508 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmax
),
510 .proc_handler
= &proc_ipc_dointvec
,
511 .strategy
= sysctl_ipc_data
,
514 .ctl_name
= KERN_MSGMNI
,
515 .procname
= "msgmni",
516 .data
= &init_ipc_ns
.msg_ctlmni
,
517 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmni
),
519 .proc_handler
= &proc_ipc_dointvec
,
520 .strategy
= sysctl_ipc_data
,
523 .ctl_name
= KERN_MSGMNB
,
524 .procname
= "msgmnb",
525 .data
= &init_ipc_ns
.msg_ctlmnb
,
526 .maxlen
= sizeof (init_ipc_ns
.msg_ctlmnb
),
528 .proc_handler
= &proc_ipc_dointvec
,
529 .strategy
= sysctl_ipc_data
,
532 .ctl_name
= KERN_SEM
,
534 .data
= &init_ipc_ns
.sem_ctls
,
535 .maxlen
= 4*sizeof (int),
537 .proc_handler
= &proc_ipc_dointvec
,
538 .strategy
= sysctl_ipc_data
,
541 #ifdef CONFIG_MAGIC_SYSRQ
543 .ctl_name
= KERN_SYSRQ
,
545 .data
= &__sysrq_enabled
,
546 .maxlen
= sizeof (int),
548 .proc_handler
= &proc_dointvec
,
551 #ifdef CONFIG_PROC_SYSCTL
553 .ctl_name
= KERN_CADPID
,
554 .procname
= "cad_pid",
556 .maxlen
= sizeof (int),
558 .proc_handler
= &proc_do_cad_pid
,
562 .ctl_name
= KERN_MAX_THREADS
,
563 .procname
= "threads-max",
564 .data
= &max_threads
,
565 .maxlen
= sizeof(int),
567 .proc_handler
= &proc_dointvec
,
570 .ctl_name
= KERN_RANDOM
,
571 .procname
= "random",
573 .child
= random_table
,
575 #ifdef CONFIG_UNIX98_PTYS
577 .ctl_name
= KERN_PTY
,
584 .ctl_name
= KERN_OVERFLOWUID
,
585 .procname
= "overflowuid",
586 .data
= &overflowuid
,
587 .maxlen
= sizeof(int),
589 .proc_handler
= &proc_dointvec_minmax
,
590 .strategy
= &sysctl_intvec
,
591 .extra1
= &minolduid
,
592 .extra2
= &maxolduid
,
595 .ctl_name
= KERN_OVERFLOWGID
,
596 .procname
= "overflowgid",
597 .data
= &overflowgid
,
598 .maxlen
= sizeof(int),
600 .proc_handler
= &proc_dointvec_minmax
,
601 .strategy
= &sysctl_intvec
,
602 .extra1
= &minolduid
,
603 .extra2
= &maxolduid
,
606 #ifdef CONFIG_MATHEMU
608 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
609 .procname
= "ieee_emulation_warnings",
610 .data
= &sysctl_ieee_emulation_warnings
,
611 .maxlen
= sizeof(int),
613 .proc_handler
= &proc_dointvec
,
616 #ifdef CONFIG_NO_IDLE_HZ
618 .ctl_name
= KERN_HZ_TIMER
,
619 .procname
= "hz_timer",
620 .data
= &sysctl_hz_timer
,
621 .maxlen
= sizeof(int),
623 .proc_handler
= &proc_dointvec
,
627 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
628 .procname
= "userprocess_debug",
629 .data
= &sysctl_userprocess_debug
,
630 .maxlen
= sizeof(int),
632 .proc_handler
= &proc_dointvec
,
636 .ctl_name
= KERN_PIDMAX
,
637 .procname
= "pid_max",
639 .maxlen
= sizeof (int),
641 .proc_handler
= &proc_dointvec_minmax
,
642 .strategy
= sysctl_intvec
,
643 .extra1
= &pid_max_min
,
644 .extra2
= &pid_max_max
,
647 .ctl_name
= KERN_PANIC_ON_OOPS
,
648 .procname
= "panic_on_oops",
649 .data
= &panic_on_oops
,
650 .maxlen
= sizeof(int),
652 .proc_handler
= &proc_dointvec
,
655 .ctl_name
= KERN_PRINTK_RATELIMIT
,
656 .procname
= "printk_ratelimit",
657 .data
= &printk_ratelimit_jiffies
,
658 .maxlen
= sizeof(int),
660 .proc_handler
= &proc_dointvec_jiffies
,
661 .strategy
= &sysctl_jiffies
,
664 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
665 .procname
= "printk_ratelimit_burst",
666 .data
= &printk_ratelimit_burst
,
667 .maxlen
= sizeof(int),
669 .proc_handler
= &proc_dointvec
,
672 .ctl_name
= KERN_NGROUPS_MAX
,
673 .procname
= "ngroups_max",
674 .data
= &ngroups_max
,
675 .maxlen
= sizeof (int),
677 .proc_handler
= &proc_dointvec
,
679 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
681 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
682 .procname
= "unknown_nmi_panic",
683 .data
= &unknown_nmi_panic
,
684 .maxlen
= sizeof (int),
686 .proc_handler
= &proc_dointvec
,
689 .ctl_name
= KERN_NMI_WATCHDOG
,
690 .procname
= "nmi_watchdog",
691 .data
= &nmi_watchdog_enabled
,
692 .maxlen
= sizeof (int),
694 .proc_handler
= &proc_nmi_enabled
,
697 #if defined(CONFIG_X86)
699 .ctl_name
= KERN_PANIC_ON_NMI
,
700 .procname
= "panic_on_unrecovered_nmi",
701 .data
= &panic_on_unrecovered_nmi
,
702 .maxlen
= sizeof(int),
704 .proc_handler
= &proc_dointvec
,
707 .ctl_name
= KERN_BOOTLOADER_TYPE
,
708 .procname
= "bootloader_type",
709 .data
= &bootloader_type
,
710 .maxlen
= sizeof (int),
712 .proc_handler
= &proc_dointvec
,
715 .ctl_name
= CTL_UNNUMBERED
,
716 .procname
= "kstack_depth_to_print",
717 .data
= &kstack_depth_to_print
,
718 .maxlen
= sizeof(int),
720 .proc_handler
= &proc_dointvec
,
723 #if defined(CONFIG_MMU)
725 .ctl_name
= KERN_RANDOMIZE
,
726 .procname
= "randomize_va_space",
727 .data
= &randomize_va_space
,
728 .maxlen
= sizeof(int),
730 .proc_handler
= &proc_dointvec
,
733 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
735 .ctl_name
= KERN_SPIN_RETRY
,
736 .procname
= "spin_retry",
738 .maxlen
= sizeof (int),
740 .proc_handler
= &proc_dointvec
,
743 #ifdef CONFIG_ACPI_SLEEP
745 .ctl_name
= KERN_ACPI_VIDEO_FLAGS
,
746 .procname
= "acpi_video_flags",
747 .data
= &acpi_video_flags
,
748 .maxlen
= sizeof (unsigned long),
750 .proc_handler
= &proc_doulongvec_minmax
,
755 .ctl_name
= KERN_IA64_UNALIGNED
,
756 .procname
= "ignore-unaligned-usertrap",
757 .data
= &no_unaligned_warning
,
758 .maxlen
= sizeof (int),
760 .proc_handler
= &proc_dointvec
,
765 .ctl_name
= KERN_COMPAT_LOG
,
766 .procname
= "compat-log",
768 .maxlen
= sizeof (int),
770 .proc_handler
= &proc_dointvec
,
773 #ifdef CONFIG_RT_MUTEXES
775 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
776 .procname
= "max_lock_depth",
777 .data
= &max_lock_depth
,
778 .maxlen
= sizeof(int),
780 .proc_handler
= &proc_dointvec
,
787 /* Constants for minimum and maximum testing in vm_table.
788 We use these as one-element integer vectors. */
790 static int one_hundred
= 100;
793 static ctl_table vm_table
[] = {
795 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
796 .procname
= "overcommit_memory",
797 .data
= &sysctl_overcommit_memory
,
798 .maxlen
= sizeof(sysctl_overcommit_memory
),
800 .proc_handler
= &proc_dointvec
,
803 .ctl_name
= VM_PANIC_ON_OOM
,
804 .procname
= "panic_on_oom",
805 .data
= &sysctl_panic_on_oom
,
806 .maxlen
= sizeof(sysctl_panic_on_oom
),
808 .proc_handler
= &proc_dointvec
,
811 .ctl_name
= VM_OVERCOMMIT_RATIO
,
812 .procname
= "overcommit_ratio",
813 .data
= &sysctl_overcommit_ratio
,
814 .maxlen
= sizeof(sysctl_overcommit_ratio
),
816 .proc_handler
= &proc_dointvec
,
819 .ctl_name
= VM_PAGE_CLUSTER
,
820 .procname
= "page-cluster",
821 .data
= &page_cluster
,
822 .maxlen
= sizeof(int),
824 .proc_handler
= &proc_dointvec
,
827 .ctl_name
= VM_DIRTY_BACKGROUND
,
828 .procname
= "dirty_background_ratio",
829 .data
= &dirty_background_ratio
,
830 .maxlen
= sizeof(dirty_background_ratio
),
832 .proc_handler
= &proc_dointvec_minmax
,
833 .strategy
= &sysctl_intvec
,
835 .extra2
= &one_hundred
,
838 .ctl_name
= VM_DIRTY_RATIO
,
839 .procname
= "dirty_ratio",
840 .data
= &vm_dirty_ratio
,
841 .maxlen
= sizeof(vm_dirty_ratio
),
843 .proc_handler
= &proc_dointvec_minmax
,
844 .strategy
= &sysctl_intvec
,
846 .extra2
= &one_hundred
,
849 .ctl_name
= VM_DIRTY_WB_CS
,
850 .procname
= "dirty_writeback_centisecs",
851 .data
= &dirty_writeback_interval
,
852 .maxlen
= sizeof(dirty_writeback_interval
),
854 .proc_handler
= &dirty_writeback_centisecs_handler
,
857 .ctl_name
= VM_DIRTY_EXPIRE_CS
,
858 .procname
= "dirty_expire_centisecs",
859 .data
= &dirty_expire_interval
,
860 .maxlen
= sizeof(dirty_expire_interval
),
862 .proc_handler
= &proc_dointvec_userhz_jiffies
,
865 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
866 .procname
= "nr_pdflush_threads",
867 .data
= &nr_pdflush_threads
,
868 .maxlen
= sizeof nr_pdflush_threads
,
869 .mode
= 0444 /* read-only*/,
870 .proc_handler
= &proc_dointvec
,
873 .ctl_name
= VM_SWAPPINESS
,
874 .procname
= "swappiness",
875 .data
= &vm_swappiness
,
876 .maxlen
= sizeof(vm_swappiness
),
878 .proc_handler
= &proc_dointvec_minmax
,
879 .strategy
= &sysctl_intvec
,
881 .extra2
= &one_hundred
,
883 #ifdef CONFIG_HUGETLB_PAGE
885 .ctl_name
= VM_HUGETLB_PAGES
,
886 .procname
= "nr_hugepages",
887 .data
= &max_huge_pages
,
888 .maxlen
= sizeof(unsigned long),
890 .proc_handler
= &hugetlb_sysctl_handler
,
891 .extra1
= (void *)&hugetlb_zero
,
892 .extra2
= (void *)&hugetlb_infinity
,
895 .ctl_name
= VM_HUGETLB_GROUP
,
896 .procname
= "hugetlb_shm_group",
897 .data
= &sysctl_hugetlb_shm_group
,
898 .maxlen
= sizeof(gid_t
),
900 .proc_handler
= &proc_dointvec
,
904 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
905 .procname
= "lowmem_reserve_ratio",
906 .data
= &sysctl_lowmem_reserve_ratio
,
907 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
909 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
910 .strategy
= &sysctl_intvec
,
913 .ctl_name
= VM_DROP_PAGECACHE
,
914 .procname
= "drop_caches",
915 .data
= &sysctl_drop_caches
,
916 .maxlen
= sizeof(int),
918 .proc_handler
= drop_caches_sysctl_handler
,
919 .strategy
= &sysctl_intvec
,
922 .ctl_name
= VM_MIN_FREE_KBYTES
,
923 .procname
= "min_free_kbytes",
924 .data
= &min_free_kbytes
,
925 .maxlen
= sizeof(min_free_kbytes
),
927 .proc_handler
= &min_free_kbytes_sysctl_handler
,
928 .strategy
= &sysctl_intvec
,
932 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
933 .procname
= "percpu_pagelist_fraction",
934 .data
= &percpu_pagelist_fraction
,
935 .maxlen
= sizeof(percpu_pagelist_fraction
),
937 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
938 .strategy
= &sysctl_intvec
,
939 .extra1
= &min_percpu_pagelist_fract
,
943 .ctl_name
= VM_MAX_MAP_COUNT
,
944 .procname
= "max_map_count",
945 .data
= &sysctl_max_map_count
,
946 .maxlen
= sizeof(sysctl_max_map_count
),
948 .proc_handler
= &proc_dointvec
952 .ctl_name
= VM_LAPTOP_MODE
,
953 .procname
= "laptop_mode",
954 .data
= &laptop_mode
,
955 .maxlen
= sizeof(laptop_mode
),
957 .proc_handler
= &proc_dointvec_jiffies
,
958 .strategy
= &sysctl_jiffies
,
961 .ctl_name
= VM_BLOCK_DUMP
,
962 .procname
= "block_dump",
964 .maxlen
= sizeof(block_dump
),
966 .proc_handler
= &proc_dointvec
,
967 .strategy
= &sysctl_intvec
,
971 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
972 .procname
= "vfs_cache_pressure",
973 .data
= &sysctl_vfs_cache_pressure
,
974 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
976 .proc_handler
= &proc_dointvec
,
977 .strategy
= &sysctl_intvec
,
980 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
982 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
983 .procname
= "legacy_va_layout",
984 .data
= &sysctl_legacy_va_layout
,
985 .maxlen
= sizeof(sysctl_legacy_va_layout
),
987 .proc_handler
= &proc_dointvec
,
988 .strategy
= &sysctl_intvec
,
994 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
995 .procname
= "zone_reclaim_mode",
996 .data
= &zone_reclaim_mode
,
997 .maxlen
= sizeof(zone_reclaim_mode
),
999 .proc_handler
= &proc_dointvec
,
1000 .strategy
= &sysctl_intvec
,
1004 .ctl_name
= VM_MIN_UNMAPPED
,
1005 .procname
= "min_unmapped_ratio",
1006 .data
= &sysctl_min_unmapped_ratio
,
1007 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1009 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1010 .strategy
= &sysctl_intvec
,
1012 .extra2
= &one_hundred
,
1015 .ctl_name
= VM_MIN_SLAB
,
1016 .procname
= "min_slab_ratio",
1017 .data
= &sysctl_min_slab_ratio
,
1018 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1020 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1021 .strategy
= &sysctl_intvec
,
1023 .extra2
= &one_hundred
,
1026 #ifdef CONFIG_X86_32
1028 .ctl_name
= VM_VDSO_ENABLED
,
1029 .procname
= "vdso_enabled",
1030 .data
= &vdso_enabled
,
1031 .maxlen
= sizeof(vdso_enabled
),
1033 .proc_handler
= &proc_dointvec
,
1034 .strategy
= &sysctl_intvec
,
1041 static ctl_table fs_table
[] = {
1043 .ctl_name
= FS_NRINODE
,
1044 .procname
= "inode-nr",
1045 .data
= &inodes_stat
,
1046 .maxlen
= 2*sizeof(int),
1048 .proc_handler
= &proc_dointvec
,
1051 .ctl_name
= FS_STATINODE
,
1052 .procname
= "inode-state",
1053 .data
= &inodes_stat
,
1054 .maxlen
= 7*sizeof(int),
1056 .proc_handler
= &proc_dointvec
,
1059 .ctl_name
= FS_NRFILE
,
1060 .procname
= "file-nr",
1061 .data
= &files_stat
,
1062 .maxlen
= 3*sizeof(int),
1064 .proc_handler
= &proc_nr_files
,
1067 .ctl_name
= FS_MAXFILE
,
1068 .procname
= "file-max",
1069 .data
= &files_stat
.max_files
,
1070 .maxlen
= sizeof(int),
1072 .proc_handler
= &proc_dointvec
,
1075 .ctl_name
= FS_DENTRY
,
1076 .procname
= "dentry-state",
1077 .data
= &dentry_stat
,
1078 .maxlen
= 6*sizeof(int),
1080 .proc_handler
= &proc_dointvec
,
1083 .ctl_name
= FS_OVERFLOWUID
,
1084 .procname
= "overflowuid",
1085 .data
= &fs_overflowuid
,
1086 .maxlen
= sizeof(int),
1088 .proc_handler
= &proc_dointvec_minmax
,
1089 .strategy
= &sysctl_intvec
,
1090 .extra1
= &minolduid
,
1091 .extra2
= &maxolduid
,
1094 .ctl_name
= FS_OVERFLOWGID
,
1095 .procname
= "overflowgid",
1096 .data
= &fs_overflowgid
,
1097 .maxlen
= sizeof(int),
1099 .proc_handler
= &proc_dointvec_minmax
,
1100 .strategy
= &sysctl_intvec
,
1101 .extra1
= &minolduid
,
1102 .extra2
= &maxolduid
,
1105 .ctl_name
= FS_LEASES
,
1106 .procname
= "leases-enable",
1107 .data
= &leases_enable
,
1108 .maxlen
= sizeof(int),
1110 .proc_handler
= &proc_dointvec
,
1112 #ifdef CONFIG_DNOTIFY
1114 .ctl_name
= FS_DIR_NOTIFY
,
1115 .procname
= "dir-notify-enable",
1116 .data
= &dir_notify_enable
,
1117 .maxlen
= sizeof(int),
1119 .proc_handler
= &proc_dointvec
,
1124 .ctl_name
= FS_LEASE_TIME
,
1125 .procname
= "lease-break-time",
1126 .data
= &lease_break_time
,
1127 .maxlen
= sizeof(int),
1129 .proc_handler
= &proc_dointvec
,
1132 .ctl_name
= FS_AIO_NR
,
1133 .procname
= "aio-nr",
1135 .maxlen
= sizeof(aio_nr
),
1137 .proc_handler
= &proc_doulongvec_minmax
,
1140 .ctl_name
= FS_AIO_MAX_NR
,
1141 .procname
= "aio-max-nr",
1142 .data
= &aio_max_nr
,
1143 .maxlen
= sizeof(aio_max_nr
),
1145 .proc_handler
= &proc_doulongvec_minmax
,
1147 #ifdef CONFIG_INOTIFY_USER
1149 .ctl_name
= FS_INOTIFY
,
1150 .procname
= "inotify",
1152 .child
= inotify_table
,
1157 .ctl_name
= KERN_SETUID_DUMPABLE
,
1158 .procname
= "suid_dumpable",
1159 .data
= &suid_dumpable
,
1160 .maxlen
= sizeof(int),
1162 .proc_handler
= &proc_dointvec
,
1167 static ctl_table debug_table
[] = {
1171 static ctl_table dev_table
[] = {
1175 extern void init_irq_proc (void);
1177 static DEFINE_SPINLOCK(sysctl_lock
);
1179 /* called under sysctl_lock */
1180 static int use_table(struct ctl_table_header
*p
)
1182 if (unlikely(p
->unregistering
))
1188 /* called under sysctl_lock */
1189 static void unuse_table(struct ctl_table_header
*p
)
1192 if (unlikely(p
->unregistering
))
1193 complete(p
->unregistering
);
1196 /* called under sysctl_lock, will reacquire if has to wait */
1197 static void start_unregistering(struct ctl_table_header
*p
)
1200 * if p->used is 0, nobody will ever touch that entry again;
1201 * we'll eliminate all paths to it before dropping sysctl_lock
1203 if (unlikely(p
->used
)) {
1204 struct completion wait
;
1205 init_completion(&wait
);
1206 p
->unregistering
= &wait
;
1207 spin_unlock(&sysctl_lock
);
1208 wait_for_completion(&wait
);
1209 spin_lock(&sysctl_lock
);
1212 * do not remove from the list until nobody holds it; walking the
1213 * list in do_sysctl() relies on that.
1215 list_del_init(&p
->ctl_entry
);
1218 void __init
sysctl_init(void)
1220 #ifdef CONFIG_PROC_SYSCTL
1221 register_proc_table(root_table
, proc_sys_root
, &root_table_header
);
1226 #ifdef CONFIG_SYSCTL_SYSCALL
1227 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1228 void __user
*newval
, size_t newlen
)
1230 struct list_head
*tmp
;
1231 int error
= -ENOTDIR
;
1233 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1237 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1240 spin_lock(&sysctl_lock
);
1241 tmp
= &root_table_header
.ctl_entry
;
1243 struct ctl_table_header
*head
=
1244 list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1246 if (!use_table(head
))
1249 spin_unlock(&sysctl_lock
);
1251 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1252 newval
, newlen
, head
->ctl_table
);
1254 spin_lock(&sysctl_lock
);
1256 if (error
!= -ENOTDIR
)
1258 } while ((tmp
= tmp
->next
) != &root_table_header
.ctl_entry
);
1259 spin_unlock(&sysctl_lock
);
1263 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1265 struct __sysctl_args tmp
;
1268 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1272 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1273 tmp
.newval
, tmp
.newlen
);
1277 #endif /* CONFIG_SYSCTL_SYSCALL */
1280 * ctl_perm does NOT grant the superuser all rights automatically, because
1281 * some sysctl variables are readonly even to root.
1284 static int test_perm(int mode
, int op
)
1288 else if (in_egroup_p(0))
1290 if ((mode
& op
& 0007) == op
)
1295 static inline int ctl_perm(ctl_table
*table
, int op
)
1298 error
= security_sysctl(table
, op
);
1301 return test_perm(table
->mode
, op
);
1304 #ifdef CONFIG_SYSCTL_SYSCALL
1305 static int parse_table(int __user
*name
, int nlen
,
1306 void __user
*oldval
, size_t __user
*oldlenp
,
1307 void __user
*newval
, size_t newlen
,
1314 if (get_user(n
, name
))
1316 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1317 if (!table
->ctl_name
)
1319 if (n
== table
->ctl_name
|| table
->ctl_name
== CTL_ANY
) {
1322 if (ctl_perm(table
, 001))
1324 if (table
->strategy
) {
1325 error
= table
->strategy(
1334 table
= table
->child
;
1337 error
= do_sysctl_strategy(table
, name
, nlen
,
1346 /* Perform the actual read/write of a sysctl table entry. */
1347 int do_sysctl_strategy (ctl_table
*table
,
1348 int __user
*name
, int nlen
,
1349 void __user
*oldval
, size_t __user
*oldlenp
,
1350 void __user
*newval
, size_t newlen
)
1359 if (ctl_perm(table
, op
))
1362 if (table
->strategy
) {
1363 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1371 /* If there is no strategy routine, or if the strategy returns
1372 * zero, proceed with automatic r/w */
1373 if (table
->data
&& table
->maxlen
) {
1374 if (oldval
&& oldlenp
) {
1375 if (get_user(len
, oldlenp
))
1378 if (len
> table
->maxlen
)
1379 len
= table
->maxlen
;
1380 if(copy_to_user(oldval
, table
->data
, len
))
1382 if(put_user(len
, oldlenp
))
1386 if (newval
&& newlen
) {
1388 if (len
> table
->maxlen
)
1389 len
= table
->maxlen
;
1390 if(copy_from_user(table
->data
, newval
, len
))
1396 #endif /* CONFIG_SYSCTL_SYSCALL */
1399 * register_sysctl_table - register a sysctl hierarchy
1400 * @table: the top-level table structure
1401 * @insert_at_head: whether the entry should be inserted in front or at the end
1403 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1404 * array. An entry with a ctl_name of 0 terminates the table.
1406 * The members of the &ctl_table structure are used as follows:
1408 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1409 * must be unique within that level of sysctl
1411 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1412 * enter a sysctl file
1414 * data - a pointer to data for use by proc_handler
1416 * maxlen - the maximum size in bytes of the data
1418 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1420 * child - a pointer to the child sysctl table if this entry is a directory, or
1423 * proc_handler - the text handler routine (described below)
1425 * strategy - the strategy routine (described below)
1427 * de - for internal use by the sysctl routines
1429 * extra1, extra2 - extra pointers usable by the proc handler routines
1431 * Leaf nodes in the sysctl tree will be represented by a single file
1432 * under /proc; non-leaf nodes will be represented by directories.
1434 * sysctl(2) can automatically manage read and write requests through
1435 * the sysctl table. The data and maxlen fields of the ctl_table
1436 * struct enable minimal validation of the values being written to be
1437 * performed, and the mode field allows minimal authentication.
1439 * More sophisticated management can be enabled by the provision of a
1440 * strategy routine with the table entry. This will be called before
1441 * any automatic read or write of the data is performed.
1443 * The strategy routine may return
1445 * < 0 - Error occurred (error is passed to user process)
1447 * 0 - OK - proceed with automatic read or write.
1449 * > 0 - OK - read or write has been done by the strategy routine, so
1450 * return immediately.
1452 * There must be a proc_handler routine for any terminal nodes
1453 * mirrored under /proc/sys (non-terminals are handled by a built-in
1454 * directory handler). Several default handlers are available to
1455 * cover common cases -
1457 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1458 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1459 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1461 * It is the handler's job to read the input buffer from user memory
1462 * and process it. The handler should return 0 on success.
1464 * This routine returns %NULL on a failure to register, and a pointer
1465 * to the table header on success.
1467 struct ctl_table_header
*register_sysctl_table(ctl_table
* table
,
1470 struct ctl_table_header
*tmp
;
1471 tmp
= kmalloc(sizeof(struct ctl_table_header
), GFP_KERNEL
);
1474 tmp
->ctl_table
= table
;
1475 INIT_LIST_HEAD(&tmp
->ctl_entry
);
1477 tmp
->unregistering
= NULL
;
1478 spin_lock(&sysctl_lock
);
1480 list_add(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1482 list_add_tail(&tmp
->ctl_entry
, &root_table_header
.ctl_entry
);
1483 spin_unlock(&sysctl_lock
);
1484 #ifdef CONFIG_PROC_SYSCTL
1485 register_proc_table(table
, proc_sys_root
, tmp
);
1491 * unregister_sysctl_table - unregister a sysctl table hierarchy
1492 * @header: the header returned from register_sysctl_table
1494 * Unregisters the sysctl table and all children. proc entries may not
1495 * actually be removed until they are no longer used by anyone.
1497 void unregister_sysctl_table(struct ctl_table_header
* header
)
1500 spin_lock(&sysctl_lock
);
1501 start_unregistering(header
);
1502 #ifdef CONFIG_PROC_SYSCTL
1503 unregister_proc_table(header
->ctl_table
, proc_sys_root
);
1505 spin_unlock(&sysctl_lock
);
1509 #else /* !CONFIG_SYSCTL */
1510 struct ctl_table_header
* register_sysctl_table(ctl_table
* table
,
1516 void unregister_sysctl_table(struct ctl_table_header
* table
)
1520 #endif /* CONFIG_SYSCTL */
1526 #ifdef CONFIG_PROC_SYSCTL
1528 /* Scan the sysctl entries in table and add them all into /proc */
1529 static void register_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
, void *set
)
1531 struct proc_dir_entry
*de
;
1535 for (; table
->ctl_name
|| table
->procname
; table
++) {
1536 /* Can't do anything without a proc name. */
1537 if (!table
->procname
)
1539 /* Maybe we can't do anything with it... */
1540 if (!table
->proc_handler
&& !table
->child
) {
1541 printk(KERN_WARNING
"SYSCTL: Can't register %s\n",
1546 len
= strlen(table
->procname
);
1550 if (table
->proc_handler
)
1554 for (de
= root
->subdir
; de
; de
= de
->next
) {
1555 if (proc_match(len
, table
->procname
, de
))
1558 /* If the subdir exists already, de is non-NULL */
1562 de
= create_proc_entry(table
->procname
, mode
, root
);
1566 de
->data
= (void *) table
;
1567 if (table
->proc_handler
)
1568 de
->proc_fops
= &proc_sys_file_operations
;
1571 if (de
->mode
& S_IFDIR
)
1572 register_proc_table(table
->child
, de
, set
);
1577 * Unregister a /proc sysctl table and any subdirectories.
1579 static void unregister_proc_table(ctl_table
* table
, struct proc_dir_entry
*root
)
1581 struct proc_dir_entry
*de
;
1582 for (; table
->ctl_name
|| table
->procname
; table
++) {
1583 if (!(de
= table
->de
))
1585 if (de
->mode
& S_IFDIR
) {
1586 if (!table
->child
) {
1587 printk (KERN_ALERT
"Help - malformed sysctl tree on free\n");
1590 unregister_proc_table(table
->child
, de
);
1592 /* Don't unregister directories which still have entries.. */
1598 * In any case, mark the entry as goner; we'll keep it
1599 * around if it's busy, but we'll know to do nothing with
1600 * its fields. We are under sysctl_lock here.
1604 /* Don't unregister proc entries that are still being used.. */
1605 if (atomic_read(&de
->count
))
1609 remove_proc_entry(table
->procname
, root
);
1613 static ssize_t
do_rw_proc(int write
, struct file
* file
, char __user
* buf
,
1614 size_t count
, loff_t
*ppos
)
1617 struct proc_dir_entry
*de
= PDE(file
->f_path
.dentry
->d_inode
);
1618 struct ctl_table
*table
;
1620 ssize_t error
= -ENOTDIR
;
1622 spin_lock(&sysctl_lock
);
1623 if (de
&& de
->data
&& use_table(de
->set
)) {
1625 * at that point we know that sysctl was not unregistered
1626 * and won't be until we finish
1628 spin_unlock(&sysctl_lock
);
1629 table
= (struct ctl_table
*) de
->data
;
1630 if (!table
|| !table
->proc_handler
)
1633 op
= (write
? 002 : 004);
1634 if (ctl_perm(table
, op
))
1637 /* careful: calling conventions are nasty here */
1639 error
= (*table
->proc_handler
)(table
, write
, file
,
1644 spin_lock(&sysctl_lock
);
1645 unuse_table(de
->set
);
1647 spin_unlock(&sysctl_lock
);
1651 static int proc_opensys(struct inode
*inode
, struct file
*file
)
1653 if (file
->f_mode
& FMODE_WRITE
) {
1655 * sysctl entries that are not writable,
1656 * are _NOT_ writable, capabilities or not.
1658 if (!(inode
->i_mode
& S_IWUSR
))
1665 static ssize_t
proc_readsys(struct file
* file
, char __user
* buf
,
1666 size_t count
, loff_t
*ppos
)
1668 return do_rw_proc(0, file
, buf
, count
, ppos
);
1671 static ssize_t
proc_writesys(struct file
* file
, const char __user
* buf
,
1672 size_t count
, loff_t
*ppos
)
1674 return do_rw_proc(1, file
, (char __user
*) buf
, count
, ppos
);
1677 static int _proc_do_string(void* data
, int maxlen
, int write
,
1678 struct file
*filp
, void __user
*buffer
,
1679 size_t *lenp
, loff_t
*ppos
)
1685 if (!data
|| !maxlen
|| !*lenp
||
1686 (*ppos
&& !write
)) {
1694 while (len
< *lenp
) {
1695 if (get_user(c
, p
++))
1697 if (c
== 0 || c
== '\n')
1703 if(copy_from_user(data
, buffer
, len
))
1705 ((char *) data
)[len
] = 0;
1714 if(copy_to_user(buffer
, data
, len
))
1717 if(put_user('\n', ((char __user
*) buffer
) + len
))
1728 * proc_dostring - read a string sysctl
1729 * @table: the sysctl table
1730 * @write: %TRUE if this is a write to the sysctl file
1731 * @filp: the file structure
1732 * @buffer: the user buffer
1733 * @lenp: the size of the user buffer
1734 * @ppos: file position
1736 * Reads/writes a string from/to the user buffer. If the kernel
1737 * buffer provided is not large enough to hold the string, the
1738 * string is truncated. The copied string is %NULL-terminated.
1739 * If the string is being read by the user process, it is copied
1740 * and a newline '\n' is added. It is truncated if the buffer is
1743 * Returns 0 on success.
1745 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
1746 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1748 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
1749 buffer
, lenp
, ppos
);
1753 * Special case of dostring for the UTS structure. This has locks
1754 * to observe. Should this be in kernel/sys.c ????
1757 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
1758 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1762 which
= get_uts(table
, write
);
1763 r
= _proc_do_string(which
, table
->maxlen
,write
,filp
,buffer
,lenp
, ppos
);
1764 put_uts(table
, write
, which
);
1768 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
1770 int write
, void *data
)
1773 *valp
= *negp
? -*lvalp
: *lvalp
;
1778 *lvalp
= (unsigned long)-val
;
1781 *lvalp
= (unsigned long)val
;
1787 static int __do_proc_dointvec(void *tbl_data
, ctl_table
*table
,
1788 int write
, struct file
*filp
, void __user
*buffer
,
1789 size_t *lenp
, loff_t
*ppos
,
1790 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1791 int write
, void *data
),
1794 #define TMPBUFLEN 21
1795 int *i
, vleft
, first
=1, neg
, val
;
1799 char buf
[TMPBUFLEN
], *p
;
1800 char __user
*s
= buffer
;
1802 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
1803 (*ppos
&& !write
)) {
1808 i
= (int *) tbl_data
;
1809 vleft
= table
->maxlen
/ sizeof(*i
);
1813 conv
= do_proc_dointvec_conv
;
1815 for (; left
&& vleft
--; i
++, first
=0) {
1830 if (len
> sizeof(buf
) - 1)
1831 len
= sizeof(buf
) - 1;
1832 if (copy_from_user(buf
, s
, len
))
1836 if (*p
== '-' && left
> 1) {
1840 if (*p
< '0' || *p
> '9')
1843 lval
= simple_strtoul(p
, &p
, 0);
1846 if ((len
< left
) && *p
&& !isspace(*p
))
1853 if (conv(&neg
, &lval
, i
, 1, data
))
1860 if (conv(&neg
, &lval
, i
, 0, data
))
1863 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
1867 if(copy_to_user(s
, buf
, len
))
1874 if (!write
&& !first
&& left
) {
1875 if(put_user('\n', s
))
1882 if (get_user(c
, s
++))
1897 static int do_proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1898 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
1899 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
1900 int write
, void *data
),
1903 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
1904 buffer
, lenp
, ppos
, conv
, data
);
1908 * proc_dointvec - read a vector of integers
1909 * @table: the sysctl table
1910 * @write: %TRUE if this is a write to the sysctl file
1911 * @filp: the file structure
1912 * @buffer: the user buffer
1913 * @lenp: the size of the user buffer
1914 * @ppos: file position
1916 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1917 * values from/to the user buffer, treated as an ASCII string.
1919 * Returns 0 on success.
1921 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
1922 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1924 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1931 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
1933 int write
, void *data
)
1935 int op
= *(int *)data
;
1937 int val
= *negp
? -*lvalp
: *lvalp
;
1939 case OP_SET
: *valp
= val
; break;
1940 case OP_AND
: *valp
&= val
; break;
1946 *lvalp
= (unsigned long)-val
;
1949 *lvalp
= (unsigned long)val
;
1956 * init may raise the set.
1959 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
1960 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1964 if (!capable(CAP_SYS_MODULE
)) {
1968 op
= is_init(current
) ? OP_SET
: OP_AND
;
1969 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
1970 do_proc_dointvec_bset_conv
,&op
);
1973 struct do_proc_dointvec_minmax_conv_param
{
1978 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
1980 int write
, void *data
)
1982 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
1984 int val
= *negp
? -*lvalp
: *lvalp
;
1985 if ((param
->min
&& *param
->min
> val
) ||
1986 (param
->max
&& *param
->max
< val
))
1993 *lvalp
= (unsigned long)-val
;
1996 *lvalp
= (unsigned long)val
;
2003 * proc_dointvec_minmax - read a vector of integers with min/max values
2004 * @table: the sysctl table
2005 * @write: %TRUE if this is a write to the sysctl file
2006 * @filp: the file structure
2007 * @buffer: the user buffer
2008 * @lenp: the size of the user buffer
2009 * @ppos: file position
2011 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2012 * values from/to the user buffer, treated as an ASCII string.
2014 * This routine will ensure the values are within the range specified by
2015 * table->extra1 (min) and table->extra2 (max).
2017 * Returns 0 on success.
2019 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2020 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2022 struct do_proc_dointvec_minmax_conv_param param
= {
2023 .min
= (int *) table
->extra1
,
2024 .max
= (int *) table
->extra2
,
2026 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2027 do_proc_dointvec_minmax_conv
, ¶m
);
2030 static int __do_proc_doulongvec_minmax(void *data
, ctl_table
*table
, int write
,
2032 void __user
*buffer
,
2033 size_t *lenp
, loff_t
*ppos
,
2034 unsigned long convmul
,
2035 unsigned long convdiv
)
2037 #define TMPBUFLEN 21
2038 unsigned long *i
, *min
, *max
, val
;
2039 int vleft
, first
=1, neg
;
2041 char buf
[TMPBUFLEN
], *p
;
2042 char __user
*s
= buffer
;
2044 if (!data
|| !table
->maxlen
|| !*lenp
||
2045 (*ppos
&& !write
)) {
2050 i
= (unsigned long *) data
;
2051 min
= (unsigned long *) table
->extra1
;
2052 max
= (unsigned long *) table
->extra2
;
2053 vleft
= table
->maxlen
/ sizeof(unsigned long);
2056 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2071 if (len
> TMPBUFLEN
-1)
2073 if (copy_from_user(buf
, s
, len
))
2077 if (*p
== '-' && left
> 1) {
2081 if (*p
< '0' || *p
> '9')
2083 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2085 if ((len
< left
) && *p
&& !isspace(*p
))
2094 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2101 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2105 if(copy_to_user(s
, buf
, len
))
2112 if (!write
&& !first
&& left
) {
2113 if(put_user('\n', s
))
2120 if (get_user(c
, s
++))
2135 static int do_proc_doulongvec_minmax(ctl_table
*table
, int write
,
2137 void __user
*buffer
,
2138 size_t *lenp
, loff_t
*ppos
,
2139 unsigned long convmul
,
2140 unsigned long convdiv
)
2142 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2143 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2147 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2148 * @table: the sysctl table
2149 * @write: %TRUE if this is a write to the sysctl file
2150 * @filp: the file structure
2151 * @buffer: the user buffer
2152 * @lenp: the size of the user buffer
2153 * @ppos: file position
2155 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2156 * values from/to the user buffer, treated as an ASCII string.
2158 * This routine will ensure the values are within the range specified by
2159 * table->extra1 (min) and table->extra2 (max).
2161 * Returns 0 on success.
2163 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2164 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2166 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2170 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2171 * @table: the sysctl table
2172 * @write: %TRUE if this is a write to the sysctl file
2173 * @filp: the file structure
2174 * @buffer: the user buffer
2175 * @lenp: the size of the user buffer
2176 * @ppos: file position
2178 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2179 * values from/to the user buffer, treated as an ASCII string. The values
2180 * are treated as milliseconds, and converted to jiffies when they are stored.
2182 * This routine will ensure the values are within the range specified by
2183 * table->extra1 (min) and table->extra2 (max).
2185 * Returns 0 on success.
2187 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2189 void __user
*buffer
,
2190 size_t *lenp
, loff_t
*ppos
)
2192 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2193 lenp
, ppos
, HZ
, 1000l);
2197 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2199 int write
, void *data
)
2202 if (*lvalp
> LONG_MAX
/ HZ
)
2204 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2210 lval
= (unsigned long)-val
;
2213 lval
= (unsigned long)val
;
2220 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2222 int write
, void *data
)
2225 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2227 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2233 lval
= (unsigned long)-val
;
2236 lval
= (unsigned long)val
;
2238 *lvalp
= jiffies_to_clock_t(lval
);
2243 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2245 int write
, void *data
)
2248 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2254 lval
= (unsigned long)-val
;
2257 lval
= (unsigned long)val
;
2259 *lvalp
= jiffies_to_msecs(lval
);
2265 * proc_dointvec_jiffies - read a vector of integers as seconds
2266 * @table: the sysctl table
2267 * @write: %TRUE if this is a write to the sysctl file
2268 * @filp: the file structure
2269 * @buffer: the user buffer
2270 * @lenp: the size of the user buffer
2271 * @ppos: file position
2273 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2274 * values from/to the user buffer, treated as an ASCII string.
2275 * The values read are assumed to be in seconds, and are converted into
2278 * Returns 0 on success.
2280 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2281 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2283 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2284 do_proc_dointvec_jiffies_conv
,NULL
);
2288 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2289 * @table: the sysctl table
2290 * @write: %TRUE if this is a write to the sysctl file
2291 * @filp: the file structure
2292 * @buffer: the user buffer
2293 * @lenp: the size of the user buffer
2294 * @ppos: pointer to the file position
2296 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2297 * values from/to the user buffer, treated as an ASCII string.
2298 * The values read are assumed to be in 1/USER_HZ seconds, and
2299 * are converted into jiffies.
2301 * Returns 0 on success.
2303 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2304 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2306 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2307 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2311 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2312 * @table: the sysctl table
2313 * @write: %TRUE if this is a write to the sysctl file
2314 * @filp: the file structure
2315 * @buffer: the user buffer
2316 * @lenp: the size of the user buffer
2317 * @ppos: file position
2318 * @ppos: the current position in the file
2320 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2321 * values from/to the user buffer, treated as an ASCII string.
2322 * The values read are assumed to be in 1/1000 seconds, and
2323 * are converted into jiffies.
2325 * Returns 0 on success.
2327 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2328 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2330 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2331 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2334 #ifdef CONFIG_SYSVIPC
2335 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2336 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2339 which
= get_ipc(table
, write
);
2340 return __do_proc_dointvec(which
, table
, write
, filp
, buffer
,
2341 lenp
, ppos
, NULL
, NULL
);
2344 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
2345 struct file
*filp
, void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2348 which
= get_ipc(table
, write
);
2349 return __do_proc_doulongvec_minmax(which
, table
, write
, filp
, buffer
,
2350 lenp
, ppos
, 1l, 1l);
2355 static int proc_do_cad_pid(ctl_table
*table
, int write
, struct file
*filp
,
2356 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2358 struct pid
*new_pid
;
2362 tmp
= pid_nr(cad_pid
);
2364 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2365 lenp
, ppos
, NULL
, NULL
);
2369 new_pid
= find_get_pid(tmp
);
2373 put_pid(xchg(&cad_pid
, new_pid
));
2377 #else /* CONFIG_PROC_FS */
2379 int proc_dostring(ctl_table
*table
, int write
, struct file
*filp
,
2380 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2385 static int proc_do_uts_string(ctl_table
*table
, int write
, struct file
*filp
,
2386 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2391 #ifdef CONFIG_SYSVIPC
2392 static int proc_do_ipc_string(ctl_table
*table
, int write
, struct file
*filp
,
2393 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2397 static int proc_ipc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2398 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2402 static int proc_ipc_doulongvec_minmax(ctl_table
*table
, int write
,
2403 struct file
*filp
, void __user
*buffer
,
2404 size_t *lenp
, loff_t
*ppos
)
2410 int proc_dointvec(ctl_table
*table
, int write
, struct file
*filp
,
2411 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2416 int proc_dointvec_bset(ctl_table
*table
, int write
, struct file
*filp
,
2417 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2422 int proc_dointvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2423 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2428 int proc_dointvec_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2429 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2434 int proc_dointvec_userhz_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2435 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2440 int proc_dointvec_ms_jiffies(ctl_table
*table
, int write
, struct file
*filp
,
2441 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2446 int proc_doulongvec_minmax(ctl_table
*table
, int write
, struct file
*filp
,
2447 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2452 int proc_doulongvec_ms_jiffies_minmax(ctl_table
*table
, int write
,
2454 void __user
*buffer
,
2455 size_t *lenp
, loff_t
*ppos
)
2461 #endif /* CONFIG_PROC_FS */
2464 #ifdef CONFIG_SYSCTL_SYSCALL
2466 * General sysctl support routines
2469 /* The generic string strategy routine: */
2470 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2471 void __user
*oldval
, size_t __user
*oldlenp
,
2472 void __user
*newval
, size_t newlen
)
2474 if (!table
->data
|| !table
->maxlen
)
2477 if (oldval
&& oldlenp
) {
2479 if (get_user(bufsize
, oldlenp
))
2482 size_t len
= strlen(table
->data
), copied
;
2484 /* This shouldn't trigger for a well-formed sysctl */
2485 if (len
> table
->maxlen
)
2486 len
= table
->maxlen
;
2488 /* Copy up to a max of bufsize-1 bytes of the string */
2489 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2491 if (copy_to_user(oldval
, table
->data
, copied
) ||
2492 put_user(0, (char __user
*)(oldval
+ copied
)))
2494 if (put_user(len
, oldlenp
))
2498 if (newval
&& newlen
) {
2499 size_t len
= newlen
;
2500 if (len
> table
->maxlen
)
2501 len
= table
->maxlen
;
2502 if(copy_from_user(table
->data
, newval
, len
))
2504 if (len
== table
->maxlen
)
2506 ((char *) table
->data
)[len
] = 0;
2512 * This function makes sure that all of the integers in the vector
2513 * are between the minimum and maximum values given in the arrays
2514 * table->extra1 and table->extra2, respectively.
2516 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2517 void __user
*oldval
, size_t __user
*oldlenp
,
2518 void __user
*newval
, size_t newlen
)
2521 if (newval
&& newlen
) {
2522 int __user
*vec
= (int __user
*) newval
;
2523 int *min
= (int *) table
->extra1
;
2524 int *max
= (int *) table
->extra2
;
2528 if (newlen
% sizeof(int) != 0)
2531 if (!table
->extra1
&& !table
->extra2
)
2534 if (newlen
> table
->maxlen
)
2535 newlen
= table
->maxlen
;
2536 length
= newlen
/ sizeof(int);
2538 for (i
= 0; i
< length
; i
++) {
2540 if (get_user(value
, vec
+ i
))
2542 if (min
&& value
< min
[i
])
2544 if (max
&& value
> max
[i
])
2551 /* Strategy function to convert jiffies to seconds */
2552 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2553 void __user
*oldval
, size_t __user
*oldlenp
,
2554 void __user
*newval
, size_t newlen
)
2559 if (get_user(olen
, oldlenp
))
2561 if (olen
!=sizeof(int))
2564 if (put_user(*(int *)(table
->data
)/HZ
, (int __user
*)oldval
) ||
2565 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2568 if (newval
&& newlen
) {
2570 if (newlen
!= sizeof(int))
2572 if (get_user(new, (int __user
*)newval
))
2574 *(int *)(table
->data
) = new*HZ
;
2579 /* Strategy function to convert jiffies to seconds */
2580 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2581 void __user
*oldval
, size_t __user
*oldlenp
,
2582 void __user
*newval
, size_t newlen
)
2587 if (get_user(olen
, oldlenp
))
2589 if (olen
!=sizeof(int))
2592 if (put_user(jiffies_to_msecs(*(int *)(table
->data
)), (int __user
*)oldval
) ||
2593 (oldlenp
&& put_user(sizeof(int),oldlenp
)))
2596 if (newval
&& newlen
) {
2598 if (newlen
!= sizeof(int))
2600 if (get_user(new, (int __user
*)newval
))
2602 *(int *)(table
->data
) = msecs_to_jiffies(new);
2608 /* The generic string strategy routine: */
2609 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
2610 void __user
*oldval
, size_t __user
*oldlenp
,
2611 void __user
*newval
, size_t newlen
)
2613 struct ctl_table uts_table
;
2615 write
= newval
&& newlen
;
2616 memcpy(&uts_table
, table
, sizeof(uts_table
));
2617 uts_table
.data
= get_uts(table
, write
);
2618 r
= sysctl_string(&uts_table
, name
, nlen
,
2619 oldval
, oldlenp
, newval
, newlen
);
2620 put_uts(table
, write
, uts_table
.data
);
2624 #ifdef CONFIG_SYSVIPC
2625 /* The generic sysctl ipc data routine. */
2626 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
2627 void __user
*oldval
, size_t __user
*oldlenp
,
2628 void __user
*newval
, size_t newlen
)
2633 /* Get out of I don't have a variable */
2634 if (!table
->data
|| !table
->maxlen
)
2637 data
= get_ipc(table
, 1);
2641 if (oldval
&& oldlenp
) {
2642 if (get_user(len
, oldlenp
))
2645 if (len
> table
->maxlen
)
2646 len
= table
->maxlen
;
2647 if (copy_to_user(oldval
, data
, len
))
2649 if (put_user(len
, oldlenp
))
2654 if (newval
&& newlen
) {
2655 if (newlen
> table
->maxlen
)
2656 newlen
= table
->maxlen
;
2658 if (copy_from_user(data
, newval
, newlen
))
2665 #else /* CONFIG_SYSCTL_SYSCALL */
2668 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2670 static int msg_count
;
2671 struct __sysctl_args tmp
;
2672 int name
[CTL_MAXNAME
];
2675 /* Read in the sysctl name for better debug message logging */
2676 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2678 if (tmp
.nlen
<= 0 || tmp
.nlen
>= CTL_MAXNAME
)
2680 for (i
= 0; i
< tmp
.nlen
; i
++)
2681 if (get_user(name
[i
], tmp
.name
+ i
))
2684 /* Ignore accesses to kernel.version */
2685 if ((tmp
.nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2688 if (msg_count
< 5) {
2691 "warning: process `%s' used the removed sysctl "
2692 "system call with ", current
->comm
);
2693 for (i
= 0; i
< tmp
.nlen
; i
++)
2694 printk("%d.", name
[i
]);
2701 int sysctl_string(ctl_table
*table
, int __user
*name
, int nlen
,
2702 void __user
*oldval
, size_t __user
*oldlenp
,
2703 void __user
*newval
, size_t newlen
)
2708 int sysctl_intvec(ctl_table
*table
, int __user
*name
, int nlen
,
2709 void __user
*oldval
, size_t __user
*oldlenp
,
2710 void __user
*newval
, size_t newlen
)
2715 int sysctl_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2716 void __user
*oldval
, size_t __user
*oldlenp
,
2717 void __user
*newval
, size_t newlen
)
2722 int sysctl_ms_jiffies(ctl_table
*table
, int __user
*name
, int nlen
,
2723 void __user
*oldval
, size_t __user
*oldlenp
,
2724 void __user
*newval
, size_t newlen
)
2729 static int sysctl_uts_string(ctl_table
*table
, int __user
*name
, int nlen
,
2730 void __user
*oldval
, size_t __user
*oldlenp
,
2731 void __user
*newval
, size_t newlen
)
2735 static int sysctl_ipc_data(ctl_table
*table
, int __user
*name
, int nlen
,
2736 void __user
*oldval
, size_t __user
*oldlenp
,
2737 void __user
*newval
, size_t newlen
)
2741 #endif /* CONFIG_SYSCTL_SYSCALL */
2744 * No sense putting this after each symbol definition, twice,
2745 * exception granted :-)
2747 EXPORT_SYMBOL(proc_dointvec
);
2748 EXPORT_SYMBOL(proc_dointvec_jiffies
);
2749 EXPORT_SYMBOL(proc_dointvec_minmax
);
2750 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
2751 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
2752 EXPORT_SYMBOL(proc_dostring
);
2753 EXPORT_SYMBOL(proc_doulongvec_minmax
);
2754 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
2755 EXPORT_SYMBOL(register_sysctl_table
);
2756 EXPORT_SYMBOL(sysctl_intvec
);
2757 EXPORT_SYMBOL(sysctl_jiffies
);
2758 EXPORT_SYMBOL(sysctl_ms_jiffies
);
2759 EXPORT_SYMBOL(sysctl_string
);
2760 EXPORT_SYMBOL(unregister_sysctl_table
);