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git.proxmox.com Git - mirror_ubuntu-bionic-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>
16 #include <linux/wait.h>
18 static void *get_uts(ctl_table
*table
, int write
)
20 char *which
= table
->data
;
21 struct uts_namespace
*uts_ns
;
23 uts_ns
= current
->nsproxy
->uts_ns
;
24 which
= (which
- (char *)&init_uts_ns
) + (char *)uts_ns
;
33 static void put_uts(ctl_table
*table
, int write
, void *which
)
41 #ifdef CONFIG_PROC_SYSCTL
43 * Special case of dostring for the UTS structure. This has locks
44 * to observe. Should this be in kernel/sys.c ????
46 static int proc_do_uts_string(ctl_table
*table
, int write
,
47 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
49 struct ctl_table uts_table
;
51 memcpy(&uts_table
, table
, sizeof(uts_table
));
52 uts_table
.data
= get_uts(table
, write
);
53 r
= proc_dostring(&uts_table
,write
,buffer
,lenp
, ppos
);
54 put_uts(table
, write
, uts_table
.data
);
57 proc_sys_poll_notify(table
->poll
);
62 #define proc_do_uts_string NULL
65 static DEFINE_CTL_TABLE_POLL(hostname_poll
);
66 static DEFINE_CTL_TABLE_POLL(domainname_poll
);
68 static struct ctl_table uts_kern_table
[] = {
71 .data
= init_uts_ns
.name
.sysname
,
72 .maxlen
= sizeof(init_uts_ns
.name
.sysname
),
74 .proc_handler
= proc_do_uts_string
,
77 .procname
= "osrelease",
78 .data
= init_uts_ns
.name
.release
,
79 .maxlen
= sizeof(init_uts_ns
.name
.release
),
81 .proc_handler
= proc_do_uts_string
,
84 .procname
= "version",
85 .data
= init_uts_ns
.name
.version
,
86 .maxlen
= sizeof(init_uts_ns
.name
.version
),
88 .proc_handler
= proc_do_uts_string
,
91 .procname
= "hostname",
92 .data
= init_uts_ns
.name
.nodename
,
93 .maxlen
= sizeof(init_uts_ns
.name
.nodename
),
95 .proc_handler
= proc_do_uts_string
,
96 .poll
= &hostname_poll
,
99 .procname
= "domainname",
100 .data
= init_uts_ns
.name
.domainname
,
101 .maxlen
= sizeof(init_uts_ns
.name
.domainname
),
103 .proc_handler
= proc_do_uts_string
,
104 .poll
= &domainname_poll
,
109 static struct ctl_table uts_root_table
[] = {
111 .procname
= "kernel",
113 .child
= uts_kern_table
,
118 #ifdef CONFIG_PROC_SYSCTL
120 * Notify userspace about a change in a certain entry of uts_kern_table,
121 * identified by the parameter proc.
123 void uts_proc_notify(enum uts_proc proc
)
125 struct ctl_table
*table
= &uts_kern_table
[proc
];
127 proc_sys_poll_notify(table
->poll
);
131 static int __init
utsname_sysctl_init(void)
133 register_sysctl_table(uts_root_table
);
137 __initcall(utsname_sysctl_init
);