Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr_security.c |
ac27a0ec DK |
3 | * Handler for storing security labels as extended attributes. |
4 | */ | |
5 | ||
ac27a0ec DK |
6 | #include <linux/string.h> |
7 | #include <linux/fs.h> | |
ac27a0ec | 8 | #include <linux/security.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
3dcf5451 CH |
10 | #include "ext4_jbd2.h" |
11 | #include "ext4.h" | |
ac27a0ec DK |
12 | #include "xattr.h" |
13 | ||
14 | static size_t | |
d9a82a04 AG |
15 | ext4_xattr_security_list(const struct xattr_handler *handler, |
16 | struct dentry *dentry, char *list, size_t list_size, | |
17 | const char *name, size_t name_len) | |
ac27a0ec DK |
18 | { |
19 | const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1; | |
20 | const size_t total_len = prefix_len + name_len + 1; | |
21 | ||
22 | ||
23 | if (list && total_len <= list_size) { | |
24 | memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); | |
25 | memcpy(list+prefix_len, name, name_len); | |
26 | list[prefix_len + name_len] = '\0'; | |
27 | } | |
28 | return total_len; | |
29 | } | |
30 | ||
31 | static int | |
d9a82a04 AG |
32 | ext4_xattr_security_get(const struct xattr_handler *handler, |
33 | struct dentry *dentry, const char *name, | |
34 | void *buffer, size_t size) | |
ac27a0ec DK |
35 | { |
36 | if (strcmp(name, "") == 0) | |
37 | return -EINVAL; | |
2b0143b5 | 38 | return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY, |
431547b3 | 39 | name, buffer, size); |
ac27a0ec DK |
40 | } |
41 | ||
42 | static int | |
d9a82a04 AG |
43 | ext4_xattr_security_set(const struct xattr_handler *handler, |
44 | struct dentry *dentry, const char *name, | |
45 | const void *value, size_t size, int flags) | |
ac27a0ec DK |
46 | { |
47 | if (strcmp(name, "") == 0) | |
48 | return -EINVAL; | |
2b0143b5 | 49 | return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY, |
431547b3 | 50 | name, value, size, flags); |
ac27a0ec DK |
51 | } |
52 | ||
176576db DH |
53 | static int |
54 | ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, | |
55 | void *fs_info) | |
ac27a0ec | 56 | { |
9d8f13ba MZ |
57 | const struct xattr *xattr; |
58 | handle_t *handle = fs_info; | |
59 | int err = 0; | |
ac27a0ec | 60 | |
9d8f13ba MZ |
61 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
62 | err = ext4_xattr_set_handle(handle, inode, | |
63 | EXT4_XATTR_INDEX_SECURITY, | |
64 | xattr->name, xattr->value, | |
65 | xattr->value_len, 0); | |
66 | if (err < 0) | |
67 | break; | |
ac27a0ec | 68 | } |
ac27a0ec DK |
69 | return err; |
70 | } | |
71 | ||
9d8f13ba MZ |
72 | int |
73 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, | |
74 | const struct qstr *qstr) | |
75 | { | |
76 | return security_inode_init_security(inode, dir, qstr, | |
77 | &ext4_initxattrs, handle); | |
78 | } | |
79 | ||
11e27528 | 80 | const struct xattr_handler ext4_xattr_security_handler = { |
ac27a0ec | 81 | .prefix = XATTR_SECURITY_PREFIX, |
617ba13b MC |
82 | .list = ext4_xattr_security_list, |
83 | .get = ext4_xattr_security_get, | |
84 | .set = ext4_xattr_security_set, | |
ac27a0ec | 85 | }; |