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
v9fs_xattr_security_get(struct dentry * dentry,const char * name,void * buffer,size_t size,int type)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
v9fs_xattr_security_set(struct dentry * dentry,const char * name,const void * value,size_t size,int flags,int type)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 };
81