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git.proxmox.com Git - mirror_ubuntu-kernels.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/export.h>
13 #include <linux/uts.h>
14 #include <linux/utsname.h>
15 #include <linux/sysctl.h>
16 #include <linux/wait.h>
17 #include <linux/rwsem.h>
19 #ifdef CONFIG_PROC_SYSCTL
21 static void *get_uts(struct ctl_table
*table
, int write
)
23 char *which
= table
->data
;
24 struct uts_namespace
*uts_ns
;
26 uts_ns
= current
->nsproxy
->uts_ns
;
27 which
= (which
- (char *)&init_uts_ns
) + (char *)uts_ns
;
36 static void put_uts(struct ctl_table
*table
, int write
, void *which
)
45 * Special case of dostring for the UTS structure. This has locks
46 * to observe. Should this be in kernel/sys.c ????
48 static int proc_do_uts_string(struct ctl_table
*table
, int write
,
49 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
51 struct ctl_table uts_table
;
53 memcpy(&uts_table
, table
, sizeof(uts_table
));
54 uts_table
.data
= get_uts(table
, write
);
55 r
= proc_dostring(&uts_table
, write
, buffer
, lenp
, ppos
);
56 put_uts(table
, write
, uts_table
.data
);
59 proc_sys_poll_notify(table
->poll
);
64 #define proc_do_uts_string NULL
67 static DEFINE_CTL_TABLE_POLL(hostname_poll
);
68 static DEFINE_CTL_TABLE_POLL(domainname_poll
);
70 static struct ctl_table uts_kern_table
[] = {
73 .data
= init_uts_ns
.name
.sysname
,
74 .maxlen
= sizeof(init_uts_ns
.name
.sysname
),
76 .proc_handler
= proc_do_uts_string
,
79 .procname
= "osrelease",
80 .data
= init_uts_ns
.name
.release
,
81 .maxlen
= sizeof(init_uts_ns
.name
.release
),
83 .proc_handler
= proc_do_uts_string
,
86 .procname
= "version",
87 .data
= init_uts_ns
.name
.version
,
88 .maxlen
= sizeof(init_uts_ns
.name
.version
),
90 .proc_handler
= proc_do_uts_string
,
93 .procname
= "hostname",
94 .data
= init_uts_ns
.name
.nodename
,
95 .maxlen
= sizeof(init_uts_ns
.name
.nodename
),
97 .proc_handler
= proc_do_uts_string
,
98 .poll
= &hostname_poll
,
101 .procname
= "domainname",
102 .data
= init_uts_ns
.name
.domainname
,
103 .maxlen
= sizeof(init_uts_ns
.name
.domainname
),
105 .proc_handler
= proc_do_uts_string
,
106 .poll
= &domainname_poll
,
111 static struct ctl_table uts_root_table
[] = {
113 .procname
= "kernel",
115 .child
= uts_kern_table
,
120 #ifdef CONFIG_PROC_SYSCTL
122 * Notify userspace about a change in a certain entry of uts_kern_table,
123 * identified by the parameter proc.
125 void uts_proc_notify(enum uts_proc proc
)
127 struct ctl_table
*table
= &uts_kern_table
[proc
];
129 proc_sys_poll_notify(table
->poll
);
133 static int __init
utsname_sysctl_init(void)
135 register_sysctl_table(uts_root_table
);
139 device_initcall(utsname_sysctl_init
);