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btrfs-progs: Do extra chunk check before processing chunk item

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Current we only do chunk validation check at mount time.

It's good for most case, but for fuzzed or manually crafted images, we
can insert a CHUNK_ITEM key into root tree.

Since mount time check will only check chunk tree, it will not check
CHUNK_ITEM in root tree.

Even with previous key type check against leaf owner, it is still
possible to modify the leaf owner to by-pass it.

So we still need to check chunk validation before processing it.

Reported-by: Lukas Lueg <lukas.lueg@gmail.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2016-08-29 16:09:02 +08:00 committed by David Sterba
parent f1934f4c78
commit 2f242115d1
3 changed files with 24 additions and 4 deletions
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16
cmds-check.c
View File

@ -5220,8 +5220,24 @@ static int process_chunk_item(struct cache_tree *chunk_cache,
int slot)
{
struct chunk_record *rec;
struct btrfs_chunk *chunk;
int ret = 0;
chunk = btrfs_item_ptr(eb, slot, struct btrfs_chunk);
/*
* Do extra check for this chunk item,
*
* It's still possible one can craft a leaf with CHUNK_ITEM, with
* wrong onwer(3) out of chunk tree, to pass both chunk tree check
* and owner<->key_type check.
*/
ret = btrfs_check_chunk_valid(global_info->tree_root, eb, chunk, slot,
key->offset);
if (ret < 0) {
error("chunk(%llu, %llu) is not valid, ignore it",
key->offset, btrfs_chunk_length(eb, chunk));
return 0;
}
rec = btrfs_new_chunk_record(eb, key, slot);
ret = insert_cache_extent(chunk_cache, &rec->cache);
if (ret) {

8
volumes.c
View File

@ -1614,10 +1614,10 @@ static struct btrfs_device *fill_missing_device(u64 devid)
* slot == -1: SYSTEM chunk
* return -EIO on error, otherwise return 0
*/
static int btrfs_check_chunk_valid(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk,
int slot, u64 logical)
int btrfs_check_chunk_valid(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk,
int slot, u64 logical)
{
u64 length;
u64 stripe_len;

4
volumes.h
View File

@ -226,4 +226,8 @@ int write_raid56_with_parity(struct btrfs_fs_info *info,
struct extent_buffer *eb,
struct btrfs_multi_bio *multi,
u64 stripe_len, u64 *raid_map);
int btrfs_check_chunk_valid(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk,
int slot, u64 logical);
#endif