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 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/string.h> | |
10 | #include <linux/capability.h> | |
11 | #include <linux/fs.h> | |
3dcf5451 CH |
12 | #include "ext4_jbd2.h" |
13 | #include "ext4.h" | |
ac27a0ec DK |
14 | #include "xattr.h" |
15 | ||
16 | #define XATTR_TRUSTED_PREFIX "trusted." | |
17 | ||
18 | static size_t | |
617ba13b | 19 | ext4_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, |
ac27a0ec DK |
20 | const char *name, size_t name_len) |
21 | { | |
22 | const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1; | |
23 | const size_t total_len = prefix_len + name_len + 1; | |
24 | ||
25 | if (!capable(CAP_SYS_ADMIN)) | |
26 | return 0; | |
27 | ||
28 | if (list && total_len <= list_size) { | |
29 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); | |
30 | memcpy(list+prefix_len, name, name_len); | |
31 | list[prefix_len + name_len] = '\0'; | |
32 | } | |
33 | return total_len; | |
34 | } | |
35 | ||
36 | static int | |
617ba13b | 37 | ext4_xattr_trusted_get(struct inode *inode, const char *name, |
ac27a0ec DK |
38 | void *buffer, size_t size) |
39 | { | |
40 | if (strcmp(name, "") == 0) | |
41 | return -EINVAL; | |
617ba13b | 42 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_TRUSTED, name, |
ac27a0ec DK |
43 | buffer, size); |
44 | } | |
45 | ||
46 | static int | |
617ba13b | 47 | ext4_xattr_trusted_set(struct inode *inode, const char *name, |
ac27a0ec DK |
48 | const void *value, size_t size, int flags) |
49 | { | |
50 | if (strcmp(name, "") == 0) | |
51 | return -EINVAL; | |
617ba13b | 52 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_TRUSTED, name, |
ac27a0ec DK |
53 | value, size, flags); |
54 | } | |
55 | ||
617ba13b | 56 | struct xattr_handler ext4_xattr_trusted_handler = { |
ac27a0ec | 57 | .prefix = XATTR_TRUSTED_PREFIX, |
617ba13b MC |
58 | .list = ext4_xattr_trusted_list, |
59 | .get = ext4_xattr_trusted_get, | |
60 | .set = ext4_xattr_trusted_set, | |
ac27a0ec | 61 | }; |