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author | Qu Wenruo <quwenruo@cn.fujitsu.com> | 2015-05-22 09:01:23 +0800 |
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committer | David Sterba <dsterba@suse.cz> | 2015-05-25 14:58:58 +0200 |
commit | 6c9e4dacb2467944b306cafe977514fae076f0da (patch) | |
tree | 881adf7bf7cf9e819ebf22234bde304d96df331f /tests/fsck-tests | |
parent | 9e3e423d688b5c825db83efd9c6ac5aa0355be55 (diff) |
btrfs-progs: Enhance read_tree_block to avoid memory corruption
Add the following tree block check to avoid memory corruption on hostile
image:
1) Check level.
Level >= BTRFS_MAX_LEVEL won't be read out.
2) Nritems.
For nr_items > max_nritems, the tree_block won't be read out.
Max nritems is calculated in a easy method.
For node, it's straightforward, just (nodesize - header size) /
(btrfs_key_ptr)
For leaf, (nodesize - header size) / (btrfs_item), as btrfs support zero
item size
This fixes 3 kernel bugs: BZ#97171, BZ#97191, BZ#97271.
Reported-by: Lukas Lueg <lukas.lueg@gmail.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'tests/fsck-tests')
0 files changed, 0 insertions, 0 deletions