Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/xattr_trusted.c |
ac27a0ec DK |
3 | * Handler for trusted extended attributes. |
4 | * | |
5 | * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org> | |
6 | */ | |
7 | ||
ac27a0ec DK |
8 | #include <linux/string.h> |
9 | #include <linux/capability.h> | |
10 | #include <linux/fs.h> | |
3dcf5451 CH |
11 | #include "ext4_jbd2.h" |
12 | #include "ext4.h" | |
ac27a0ec DK |
13 | #include "xattr.h" |
14 | ||
ac27a0ec | 15 | static size_t |
431547b3 CH |
16 | ext4_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size, |
17 | const char *name, size_t name_len, int type) | |
ac27a0ec | 18 | { |
3537576a | 19 | const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN; |
ac27a0ec DK |
20 | const size_t total_len = prefix_len + name_len + 1; |
21 | ||
22 | if (!capable(CAP_SYS_ADMIN)) | |
23 | return 0; | |
24 | ||
25 | if (list && total_len <= list_size) { | |
26 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); | |
27 | memcpy(list+prefix_len, name, name_len); | |
28 | list[prefix_len + name_len] = '\0'; | |
29 | } | |
30 | return total_len; | |
31 | } | |
32 | ||
33 | static int | |
431547b3 CH |
34 | ext4_xattr_trusted_get(struct dentry *dentry, const char *name, void *buffer, |
35 | size_t size, int type) | |
ac27a0ec DK |
36 | { |
37 | if (strcmp(name, "") == 0) | |
38 | return -EINVAL; | |
2b0143b5 | 39 | return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_TRUSTED, |
431547b3 | 40 | name, buffer, size); |
ac27a0ec DK |
41 | } |
42 | ||
43 | static int | |
431547b3 CH |
44 | ext4_xattr_trusted_set(struct dentry *dentry, const char *name, |
45 | const void *value, size_t size, int flags, int type) | |
ac27a0ec DK |
46 | { |
47 | if (strcmp(name, "") == 0) | |
48 | return -EINVAL; | |
2b0143b5 | 49 | return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_TRUSTED, |
431547b3 | 50 | name, value, size, flags); |
ac27a0ec DK |
51 | } |
52 | ||
11e27528 | 53 | const struct xattr_handler ext4_xattr_trusted_handler = { |
ac27a0ec | 54 | .prefix = XATTR_TRUSTED_PREFIX, |
617ba13b MC |
55 | .list = ext4_xattr_trusted_list, |
56 | .get = ext4_xattr_trusted_get, | |
57 | .set = ext4_xattr_trusted_set, | |
ac27a0ec | 58 | }; |