| 1 | /* |
| 2 | * linux/fs/ext2/xattr_trusted.c |
| 3 | * Handler for trusted extended attributes. |
| 4 | * |
| 5 | * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 6 | */ |
| 7 | |
| 8 | #include "ext2.h" |
| 9 | #include "xattr.h" |
| 10 | |
| 11 | static size_t |
| 12 | ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size, |
| 13 | const char *name, size_t name_len, int type) |
| 14 | { |
| 15 | const int prefix_len = XATTR_TRUSTED_PREFIX_LEN; |
| 16 | const size_t total_len = prefix_len + name_len + 1; |
| 17 | |
| 18 | if (!capable(CAP_SYS_ADMIN)) |
| 19 | return 0; |
| 20 | |
| 21 | if (list && total_len <= list_size) { |
| 22 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); |
| 23 | memcpy(list+prefix_len, name, name_len); |
| 24 | list[prefix_len + name_len] = '\0'; |
| 25 | } |
| 26 | return total_len; |
| 27 | } |
| 28 | |
| 29 | static int |
| 30 | ext2_xattr_trusted_get(struct dentry *dentry, const char *name, |
| 31 | void *buffer, size_t size, int type) |
| 32 | { |
| 33 | if (strcmp(name, "") == 0) |
| 34 | return -EINVAL; |
| 35 | return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_TRUSTED, name, |
| 36 | buffer, size); |
| 37 | } |
| 38 | |
| 39 | static int |
| 40 | ext2_xattr_trusted_set(struct dentry *dentry, const char *name, |
| 41 | const void *value, size_t size, int flags, int type) |
| 42 | { |
| 43 | if (strcmp(name, "") == 0) |
| 44 | return -EINVAL; |
| 45 | return ext2_xattr_set(d_inode(dentry), EXT2_XATTR_INDEX_TRUSTED, name, |
| 46 | value, size, flags); |
| 47 | } |
| 48 | |
| 49 | const struct xattr_handler ext2_xattr_trusted_handler = { |
| 50 | .prefix = XATTR_TRUSTED_PREFIX, |
| 51 | .list = ext2_xattr_trusted_list, |
| 52 | .get = ext2_xattr_trusted_get, |
| 53 | .set = ext2_xattr_trusted_set, |
| 54 | }; |