1 #include <linux/reiserfs_fs.h>
2 #include <linux/capability.h>
3 #include <linux/errno.h>
4 #include <linux/fs.h>
5 #include <linux/pagemap.h>
6 #include <linux/xattr.h>
7 #include <linux/reiserfs_xattr.h>
8 #include <asm/uaccess.h>
9
10 static int
11 trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
12 {
13 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
14 return -EINVAL;
15
16 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
17 return -EPERM;
18
19 return reiserfs_xattr_get(inode, name, buffer, size);
20 }
21
22 static int
23 trusted_set(struct inode *inode, const char *name, const void *buffer,
24 size_t size, int flags)
25 {
26 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
27 return -EINVAL;
28
29 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
30 return -EPERM;
31
32 return reiserfs_xattr_set(inode, name, buffer, size, flags);
33 }
34
35 static size_t trusted_list(struct inode *inode, char *list, size_t list_size,
36 const char *name, size_t name_len)
37 {
38 const size_t len = name_len + 1;
39
40 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
41 return 0;
42
43 if (list && len <= list_size) {
44 memcpy(list, name, name_len);
45 list[name_len] = '\0';
46 }
47 return len;
48 }
49
50 struct xattr_handler reiserfs_xattr_trusted_handler = {
51 .prefix = XATTR_TRUSTED_PREFIX,
52 .get = trusted_get,
53 .set = trusted_set,
54 .list = trusted_list,
55 };
56
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