projects/linux·blob v2.6.24-rc1 · refs

143 lines · 3.3 KiB

1/*
2 * Copyright (C) 2007
3 *
4 * Author: Eric Biederman <[email protected]>
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/module.h>
13#include <linux/uts.h>
14#include <linux/utsname.h>
15#include <linux/version.h>
16#include <linux/sysctl.h>
17
18static void *get_uts(ctl_table *table, int write)
19{
20 char *which = table->data;
21
22 if (!write)
23 down_read(&uts_sem);
24 else
25 down_write(&uts_sem);
26 return which;
27}
28
29static void put_uts(ctl_table *table, int write, void *which)
30{
31 if (!write)
32 up_read(&uts_sem);
33 else
34 up_write(&uts_sem);
35}
36
37#ifdef CONFIG_PROC_FS
38/*
39 * Special case of dostring for the UTS structure. This has locks
40 * to observe. Should this be in kernel/sys.c ????
41 */
42static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
43 void __user *buffer, size_t *lenp, loff_t *ppos)
44{
45 struct ctl_table uts_table;
46 int r;
47 memcpy(&uts_table, table, sizeof(uts_table));
48 uts_table.data = get_uts(table, write);
49 r = proc_dostring(&uts_table,write,filp,buffer,lenp, ppos);
50 put_uts(table, write, uts_table.data);
51 return r;
52}
53#else
54#define proc_do_uts_string NULL
55#endif
56
57
58#ifdef CONFIG_SYSCTL_SYSCALL
59/* The generic string strategy routine: */
60static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
61 void __user *oldval, size_t __user *oldlenp,
62 void __user *newval, size_t newlen)
63{
64 struct ctl_table uts_table;
65 int r, write;
66 write = newval && newlen;
67 memcpy(&uts_table, table, sizeof(uts_table));
68 uts_table.data = get_uts(table, write);
69 r = sysctl_string(&uts_table, name, nlen,
70 oldval, oldlenp, newval, newlen);
71 put_uts(table, write, uts_table.data);
72 return r;
73}
74#else
75#define sysctl_uts_string NULL
76#endif
77
78static struct ctl_table uts_kern_table[] = {
79 {
80 .ctl_name = KERN_OSTYPE,
81 .procname = "ostype",
82 .data = init_uts_ns.name.sysname,
83 .maxlen = sizeof(init_uts_ns.name.sysname),
84 .mode = 0444,
85 .proc_handler = proc_do_uts_string,
86 .strategy = sysctl_uts_string,
87 },
88 {
89 .ctl_name = KERN_OSRELEASE,
90 .procname = "osrelease",
91 .data = init_uts_ns.name.release,
92 .maxlen = sizeof(init_uts_ns.name.release),
93 .mode = 0444,
94 .proc_handler = proc_do_uts_string,
95 .strategy = sysctl_uts_string,
96 },
97 {
98 .ctl_name = KERN_VERSION,
99 .procname = "version",
100 .data = init_uts_ns.name.version,
101 .maxlen = sizeof(init_uts_ns.name.version),
102 .mode = 0444,
103 .proc_handler = proc_do_uts_string,
104 .strategy = sysctl_uts_string,
105 },
106 {
107 .ctl_name = KERN_NODENAME,
108 .procname = "hostname",
109 .data = init_uts_ns.name.nodename,
110 .maxlen = sizeof(init_uts_ns.name.nodename),
111 .mode = 0644,
112 .proc_handler = proc_do_uts_string,
113 .strategy = sysctl_uts_string,
114 },
115 {
116 .ctl_name = KERN_DOMAINNAME,
117 .procname = "domainname",
118 .data = init_uts_ns.name.domainname,
119 .maxlen = sizeof(init_uts_ns.name.domainname),
120 .mode = 0644,
121 .proc_handler = proc_do_uts_string,
122 .strategy = sysctl_uts_string,
123 },
124 {}
125};
126
127static struct ctl_table uts_root_table[] = {
128 {
129 .ctl_name = CTL_KERN,
130 .procname = "kernel",
131 .mode = 0555,
132 .child = uts_kern_table,
133 },
134 {}
135};
136
137static int __init utsname_sysctl_init(void)
138{
139 register_sysctl_table(uts_root_table);
140 return 0;
141}
142
143__initcall(utsname_sysctl_init);