Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing. Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping. B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access. The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted. This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
36a580eb489f54d81a0534974962e732a314b999 to < 39005fd1ce654ffdecacddc406b9a038efe606e6affected36a580eb489f54d81a0534974962e732a314b999 to < bf49e6f6ddc12445a0330708b365de6458085980affected36a580eb489f54d81a0534974962e732a314b999 to < 4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826daffected36a580eb489f54d81a0534974962e732a314b999 to < b313edfbc0c2a60f7ce09b2e81ee71909ab8ddafaffected36a580eb489f54d81a0534974962e732a314b999 to < 5d3783c451a546373662ee11ec17019273e68034affected36a580eb489f54d81a0534974962e732a314b999 to < 448636c745a3f3b8582a0b8ce718c890a11c0fa9affected36a580eb489f54d81a0534974962e732a314b999 to < 28362e8ce51377afdec1782e661e808328a10514affected36a580eb489f54d81a0534974962e732a314b999 to < 45662dedb8f272ef7f16e69f13424c4bd0399240affected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/39005fd1ce654ffdecacddc406b9a038efe606e6 ↗
- https://git.kernel.org/stable/c/bf49e6f6ddc12445a0330708b365de6458085980 ↗
- https://git.kernel.org/stable/c/4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d ↗
- https://git.kernel.org/stable/c/b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf ↗
- https://git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034 ↗
- https://git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9 ↗
- https://git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514 ↗
- https://git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240 ↗