Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 36a580eb489f54d81a0534974962e732a314b999 before 39005fd1ce654ffdecacddc406b9a038efe606e6; affected 36a580eb489f54d81a0534974962e732a314b999 before bf49e6f6ddc12445a0330708b365de6458085980; affected 36a580eb489f54d81a0534974962e732a314b999 before 4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d; affected 36a580eb489f54d81a0534974962e732a314b999 before b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf; affected 36a580eb489f54d81a0534974962e732a314b999 before 5d3783c451a546373662ee11ec17019273e68034; affected 36a580eb489f54d81a0534974962e732a314b999 before 448636c745a3f3b8582a0b8ce718c890a11c0fa9; affected 36a580eb489f54d81a0534974962e732a314b999 before 28362e8ce51377afdec1782e661e808328a10514; affected 36a580eb489f54d81a0534974962e732a314b999 before 45662dedb8f272ef7f16e69f13424c4bd0399240 |
| Linux / Linux | affected 2.6.30; unaffected 0 before 2.6.30; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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