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1 | /* |
2 | * Copyright (C) 2007 |
3 | * |
4 | * Author: Eric Biederman <ebiederm@xmision.com> |
5 | * |
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 |
9 | * License. |
10 | */ |
11 | |
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 | |
18 | static void *get_uts(ctl_table *table, int write) |
19 | { |
20 | char *which = table->data; |
21 | struct uts_namespace *uts_ns; |
22 | |
23 | uts_ns = current->nsproxy->uts_ns; |
24 | which = (which - (char *)&init_uts_ns) + (char *)uts_ns; |
25 | |
26 | if (!write) |
27 | down_read(&uts_sem); |
28 | else |
29 | down_write(&uts_sem); |
30 | return which; |
31 | } |
32 | |
33 | static void put_uts(ctl_table *table, int write, void *which) |
34 | { |
35 | if (!write) |
36 | up_read(&uts_sem); |
37 | else |
38 | up_write(&uts_sem); |
39 | } |
40 | |
41 | #ifdef CONFIG_PROC_SYSCTL |
42 | /* |
43 | * Special case of dostring for the UTS structure. This has locks |
44 | * to observe. Should this be in kernel/sys.c ???? |
45 | */ |
46 | static int proc_do_uts_string(ctl_table *table, int write, |
47 | void __user *buffer, size_t *lenp, loff_t *ppos) |
48 | { |
49 | struct ctl_table uts_table; |
50 | int r; |
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); |
55 | |
56 | if (write) |
57 | proc_sys_poll_notify(table->poll); |
58 | |
59 | return r; |
60 | } |
61 | #else |
62 | #define proc_do_uts_string NULL |
63 | #endif |
64 | |
65 | static DEFINE_CTL_TABLE_POLL(hostname_poll); |
66 | static DEFINE_CTL_TABLE_POLL(domainname_poll); |
67 | |
68 | static struct ctl_table uts_kern_table[] = { |
69 | { |
70 | .procname = "ostype", |
71 | .data = init_uts_ns.name.sysname, |
72 | .maxlen = sizeof(init_uts_ns.name.sysname), |
73 | .mode = 0444, |
74 | .proc_handler = proc_do_uts_string, |
75 | }, |
76 | { |
77 | .procname = "osrelease", |
78 | .data = init_uts_ns.name.release, |
79 | .maxlen = sizeof(init_uts_ns.name.release), |
80 | .mode = 0444, |
81 | .proc_handler = proc_do_uts_string, |
82 | }, |
83 | { |
84 | .procname = "version", |
85 | .data = init_uts_ns.name.version, |
86 | .maxlen = sizeof(init_uts_ns.name.version), |
87 | .mode = 0444, |
88 | .proc_handler = proc_do_uts_string, |
89 | }, |
90 | { |
91 | .procname = "hostname", |
92 | .data = init_uts_ns.name.nodename, |
93 | .maxlen = sizeof(init_uts_ns.name.nodename), |
94 | .mode = 0644, |
95 | .proc_handler = proc_do_uts_string, |
96 | .poll = &hostname_poll, |
97 | }, |
98 | { |
99 | .procname = "domainname", |
100 | .data = init_uts_ns.name.domainname, |
101 | .maxlen = sizeof(init_uts_ns.name.domainname), |
102 | .mode = 0644, |
103 | .proc_handler = proc_do_uts_string, |
104 | .poll = &domainname_poll, |
105 | }, |
106 | {} |
107 | }; |
108 | |
109 | static struct ctl_table uts_root_table[] = { |
110 | { |
111 | .procname = "kernel", |
112 | .mode = 0555, |
113 | .child = uts_kern_table, |
114 | }, |
115 | {} |
116 | }; |
117 | |
118 | #ifdef CONFIG_PROC_SYSCTL |
119 | /* |
120 | * Notify userspace about a change in a certain entry of uts_kern_table, |
121 | * identified by the parameter proc. |
122 | */ |
123 | void uts_proc_notify(enum uts_proc proc) |
124 | { |
125 | struct ctl_table *table = &uts_kern_table[proc]; |
126 | |
127 | proc_sys_poll_notify(table->poll); |
128 | } |
129 | #endif |
130 | |
131 | static int __init utsname_sysctl_init(void) |
132 | { |
133 | register_sysctl_table(uts_root_table); |
134 | return 0; |
135 | } |
136 | |
137 | __initcall(utsname_sysctl_init); |
138 |
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