Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/xattr_trusted.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 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> |
| 12 | #include <linux/smp_lock.h> |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 13 | #include <linux/ext4_jbd.h> |
| 14 | #include <linux/ext4_fs.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 15 | #include "xattr.h" |
| 16 | |
| 17 | #define XATTR_TRUSTED_PREFIX "trusted." |
| 18 | |
| 19 | static size_t |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 20 | ext4_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 21 | const char *name, size_t name_len) |
| 22 | { |
| 23 | const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1; |
| 24 | const size_t total_len = prefix_len + name_len + 1; |
| 25 | |
| 26 | if (!capable(CAP_SYS_ADMIN)) |
| 27 | return 0; |
| 28 | |
| 29 | if (list && total_len <= list_size) { |
| 30 | memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); |
| 31 | memcpy(list+prefix_len, name, name_len); |
| 32 | list[prefix_len + name_len] = '\0'; |
| 33 | } |
| 34 | return total_len; |
| 35 | } |
| 36 | |
| 37 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 38 | ext4_xattr_trusted_get(struct inode *inode, const char *name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 39 | void *buffer, size_t size) |
| 40 | { |
| 41 | if (strcmp(name, "") == 0) |
| 42 | return -EINVAL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 43 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_TRUSTED, name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 44 | buffer, size); |
| 45 | } |
| 46 | |
| 47 | static int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 48 | ext4_xattr_trusted_set(struct inode *inode, const char *name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 49 | const void *value, size_t size, int flags) |
| 50 | { |
| 51 | if (strcmp(name, "") == 0) |
| 52 | return -EINVAL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 53 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_TRUSTED, name, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 54 | value, size, flags); |
| 55 | } |
| 56 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 57 | struct xattr_handler ext4_xattr_trusted_handler = { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 58 | .prefix = XATTR_TRUSTED_PREFIX, |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 59 | .list = ext4_xattr_trusted_list, |
| 60 | .get = ext4_xattr_trusted_get, |
| 61 | .set = ext4_xattr_trusted_set, |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 62 | }; |