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d9a73859 JG |
1 | /* |
2 | * Copyright IBM Corporation, 2010 | |
3 | * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of version 2.1 of the GNU Lesser General Public License | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it would be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
12 | * | |
13 | */ | |
14 | ||
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/slab.h> | |
20 | #include "xattr.h" | |
21 | ||
22 | static int v9fs_xattr_security_get(struct dentry *dentry, const char *name, | |
23 | void *buffer, size_t size, int type) | |
24 | { | |
25 | int retval; | |
26 | char *full_name; | |
27 | size_t name_len; | |
28 | size_t prefix_len = XATTR_SECURITY_PREFIX_LEN; | |
29 | ||
30 | if (name == NULL) | |
31 | return -EINVAL; | |
32 | ||
33 | if (strcmp(name, "") == 0) | |
34 | return -EINVAL; | |
35 | ||
36 | name_len = strlen(name); | |
37 | full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL); | |
38 | if (!full_name) | |
39 | return -ENOMEM; | |
40 | memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len); | |
41 | memcpy(full_name+prefix_len, name, name_len); | |
42 | full_name[prefix_len + name_len] = '\0'; | |
43 | ||
44 | retval = v9fs_xattr_get(dentry, full_name, buffer, size); | |
45 | kfree(full_name); | |
46 | return retval; | |
47 | } | |
48 | ||
49 | static int v9fs_xattr_security_set(struct dentry *dentry, const char *name, | |
50 | const void *value, size_t size, int flags, int type) | |
51 | { | |
52 | int retval; | |
53 | char *full_name; | |
54 | size_t name_len; | |
55 | size_t prefix_len = XATTR_SECURITY_PREFIX_LEN; | |
56 | ||
57 | if (name == NULL) | |
58 | return -EINVAL; | |
59 | ||
60 | if (strcmp(name, "") == 0) | |
61 | return -EINVAL; | |
62 | ||
63 | name_len = strlen(name); | |
64 | full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL); | |
65 | if (!full_name) | |
66 | return -ENOMEM; | |
67 | memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len); | |
68 | memcpy(full_name + prefix_len, name, name_len); | |
69 | full_name[prefix_len + name_len] = '\0'; | |
70 | ||
71 | retval = v9fs_xattr_set(dentry, full_name, value, size, flags); | |
72 | kfree(full_name); | |
73 | return retval; | |
74 | } | |
75 | ||
76 | struct xattr_handler v9fs_xattr_security_handler = { | |
77 | .prefix = XATTR_SECURITY_PREFIX, | |
78 | .get = v9fs_xattr_security_get, | |
79 | .set = v9fs_xattr_security_set, | |
80 | }; |