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Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
[karo-tx-linux.git] / fs / ext2 / xattr_security.c
1 /*
2  * linux/fs/ext2/xattr_security.c
3  * Handler for storing security labels as extended attributes.
4  */
5
6 #include "ext2.h"
7 #include <linux/security.h>
8 #include "xattr.h"
9
10 static size_t
11 ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
12                          const char *name, size_t name_len, int type)
13 {
14         const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
15         const size_t total_len = prefix_len + name_len + 1;
16
17         if (list && total_len <= list_size) {
18                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
19                 memcpy(list+prefix_len, name, name_len);
20                 list[prefix_len + name_len] = '\0';
21         }
22         return total_len;
23 }
24
25 static int
26 ext2_xattr_security_get(struct dentry *dentry, const char *name,
27                        void *buffer, size_t size, int type)
28 {
29         if (strcmp(name, "") == 0)
30                 return -EINVAL;
31         return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
32                               buffer, size);
33 }
34
35 static int
36 ext2_xattr_security_set(struct dentry *dentry, const char *name,
37                 const void *value, size_t size, int flags, int type)
38 {
39         if (strcmp(name, "") == 0)
40                 return -EINVAL;
41         return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
42                               value, size, flags);
43 }
44
45 static int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
46                            void *fs_info)
47 {
48         const struct xattr *xattr;
49         int err = 0;
50
51         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
52                 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
53                                      xattr->name, xattr->value,
54                                      xattr->value_len, 0);
55                 if (err < 0)
56                         break;
57         }
58         return err;
59 }
60
61 int
62 ext2_init_security(struct inode *inode, struct inode *dir,
63                    const struct qstr *qstr)
64 {
65         return security_inode_init_security(inode, dir, qstr,
66                                             &ext2_initxattrs, NULL);
67 }
68
69 const struct xattr_handler ext2_xattr_security_handler = {
70         .prefix = XATTR_SECURITY_PREFIX,
71         .list   = ext2_xattr_security_list,
72         .get    = ext2_xattr_security_get,
73         .set    = ext2_xattr_security_set,
74 };