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Commit | Line | Data |
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1 | /* | |
2 | * linux/fs/ext4/xattr_security.c | |
3 | * Handler for storing security labels as extended attributes. | |
4 | */ | |
5 | ||
6 | #include <linux/string.h> | |
7 | #include <linux/fs.h> | |
8 | #include <linux/security.h> | |
9 | #include <linux/slab.h> | |
10 | #include "ext4_jbd2.h" | |
11 | #include "ext4.h" | |
12 | #include "xattr.h" | |
13 | ||
14 | static size_t | |
15 | ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, | |
16 | const char *name, size_t name_len, int type) | |
17 | { | |
18 | const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1; | |
19 | const size_t total_len = prefix_len + name_len + 1; | |
20 | ||
21 | ||
22 | if (list && total_len <= list_size) { | |
23 | memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); | |
24 | memcpy(list+prefix_len, name, name_len); | |
25 | list[prefix_len + name_len] = '\0'; | |
26 | } | |
27 | return total_len; | |
28 | } | |
29 | ||
30 | static int | |
31 | ext4_xattr_security_get(struct dentry *dentry, const char *name, | |
32 | void *buffer, size_t size, int type) | |
33 | { | |
34 | if (strcmp(name, "") == 0) | |
35 | return -EINVAL; | |
36 | return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY, | |
37 | name, buffer, size); | |
38 | } | |
39 | ||
40 | static int | |
41 | ext4_xattr_security_set(struct dentry *dentry, const char *name, | |
42 | const void *value, size_t size, int flags, int type) | |
43 | { | |
44 | if (strcmp(name, "") == 0) | |
45 | return -EINVAL; | |
46 | return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY, | |
47 | name, value, size, flags); | |
48 | } | |
49 | ||
50 | static int | |
51 | ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, | |
52 | void *fs_info) | |
53 | { | |
54 | const struct xattr *xattr; | |
55 | handle_t *handle = fs_info; | |
56 | int err = 0; | |
57 | ||
58 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
59 | err = ext4_xattr_set_handle(handle, inode, | |
60 | EXT4_XATTR_INDEX_SECURITY, | |
61 | xattr->name, xattr->value, | |
62 | xattr->value_len, 0); | |
63 | if (err < 0) | |
64 | break; | |
65 | } | |
66 | return err; | |
67 | } | |
68 | ||
69 | int | |
70 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, | |
71 | const struct qstr *qstr) | |
72 | { | |
73 | return security_inode_init_security(inode, dir, qstr, | |
74 | &ext4_initxattrs, handle); | |
75 | } | |
76 | ||
77 | const struct xattr_handler ext4_xattr_security_handler = { | |
78 | .prefix = XATTR_SECURITY_PREFIX, | |
79 | .list = ext4_xattr_security_list, | |
80 | .get = ext4_xattr_security_get, | |
81 | .set = ext4_xattr_security_set, | |
82 | }; |