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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - kernel/utsname_sysctl.c
4 * Author: Eric Biederman <ebiederm@xmision.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
12 #include <linux/module.h>
13 #include <linux/uts.h>
14 #include <linux/utsname.h>
15 #include <linux/sysctl.h>
17 static void *get_uts(ctl_table
*table
, int write
)
19 char *which
= table
->data
;
20 struct uts_namespace
*uts_ns
;
22 uts_ns
= current
->nsproxy
->uts_ns
;
23 which
= (which
- (char *)&init_uts_ns
) + (char *)uts_ns
;
32 static void put_uts(ctl_table
*table
, int write
, void *which
)
40 #ifdef CONFIG_PROC_SYSCTL
42 * Special case of dostring for the UTS structure. This has locks
43 * to observe. Should this be in kernel/sys.c ????
45 static int proc_do_uts_string(ctl_table
*table
, int write
,
46 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
48 struct ctl_table uts_table
;
50 memcpy(&uts_table
, table
, sizeof(uts_table
));
51 uts_table
.data
= get_uts(table
, write
);
52 r
= proc_dostring(&uts_table
,write
,buffer
,lenp
, ppos
);
53 put_uts(table
, write
, uts_table
.data
);
57 #define proc_do_uts_string NULL
61 #ifdef CONFIG_SYSCTL_SYSCALL
62 /* The generic string strategy routine: */
63 static int sysctl_uts_string(ctl_table
*table
,
64 void __user
*oldval
, size_t __user
*oldlenp
,
65 void __user
*newval
, size_t newlen
)
67 struct ctl_table uts_table
;
69 write
= newval
&& newlen
;
70 memcpy(&uts_table
, table
, sizeof(uts_table
));
71 uts_table
.data
= get_uts(table
, write
);
72 r
= sysctl_string(&uts_table
, oldval
, oldlenp
, newval
, newlen
);
73 put_uts(table
, write
, uts_table
.data
);
77 #define sysctl_uts_string NULL
80 static struct ctl_table uts_kern_table
[] = {
82 .ctl_name
= KERN_OSTYPE
,
84 .data
= init_uts_ns
.name
.sysname
,
85 .maxlen
= sizeof(init_uts_ns
.name
.sysname
),
87 .proc_handler
= proc_do_uts_string
,
88 .strategy
= sysctl_uts_string
,
91 .ctl_name
= KERN_OSRELEASE
,
92 .procname
= "osrelease",
93 .data
= init_uts_ns
.name
.release
,
94 .maxlen
= sizeof(init_uts_ns
.name
.release
),
96 .proc_handler
= proc_do_uts_string
,
97 .strategy
= sysctl_uts_string
,
100 .ctl_name
= KERN_VERSION
,
101 .procname
= "version",
102 .data
= init_uts_ns
.name
.version
,
103 .maxlen
= sizeof(init_uts_ns
.name
.version
),
105 .proc_handler
= proc_do_uts_string
,
106 .strategy
= sysctl_uts_string
,
109 .ctl_name
= KERN_NODENAME
,
110 .procname
= "hostname",
111 .data
= init_uts_ns
.name
.nodename
,
112 .maxlen
= sizeof(init_uts_ns
.name
.nodename
),
114 .proc_handler
= proc_do_uts_string
,
115 .strategy
= sysctl_uts_string
,
118 .ctl_name
= KERN_DOMAINNAME
,
119 .procname
= "domainname",
120 .data
= init_uts_ns
.name
.domainname
,
121 .maxlen
= sizeof(init_uts_ns
.name
.domainname
),
123 .proc_handler
= proc_do_uts_string
,
124 .strategy
= sysctl_uts_string
,
129 static struct ctl_table uts_root_table
[] = {
131 .ctl_name
= CTL_KERN
,
132 .procname
= "kernel",
134 .child
= uts_kern_table
,
139 static int __init
utsname_sysctl_init(void)
141 register_sysctl_table(uts_root_table
);
145 __initcall(utsname_sysctl_init
);