Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty() nilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks by comparing it with the current block number bd_blocknr. If they differ, the block is considered dead and skipped. However, bd_oblocknr should never be 0 since block 0 typically stores the primary superblock and is never a valid GC target block. A corrupted ioctl request with bd_oblocknr set to 0 causes the comparison to incorrectly match when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing the dead block check and calling nilfs_bmap_mark() on a non-existent block. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering the WARN_ON(ret == -ENOENT). Fix this by rejecting ioctl requests with bd_oblocknr set to 0 at the beginning of each iteration. [ryusuke: slightly modified the commit message and comments for accuracy]
Affected products
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – e0a0c4903cbba351f0f5b5d104960d3a5b23202f
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – 9472d37799a0b9ff9b99639f35961ac2f0b3c9be
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – 65e07964b4b2daf9a54e686cf0fa72d74a9648a8
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – b88f905d4449b70da6bda547be546e365e44352e
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – 4525658002be3ad310b16bf8db48c8adb6a55d32
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – e5ff0ba4b6983cdbcc826efc201e7179ece5d46f
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – 94094e70fe292c9566502772d4d4d6d6a99204b1
- Linux / Linux7942b919f7321f95a777d396ff7894a7a83dc9b0 – be3e5d10643d3be1cbac9d9939f220a99253f980
- Linux / Linux2.6.30 – 2.6.30
- Linux / Linux0 – 2.6.30
- Linux / Linux5.10.258 – 5.10.*
- Linux / Linux5.15.209 – 5.15.*
- Linux / Linux6.1.175 – 6.1.*
- Linux / Linux6.6.141 – 6.6.*
- Linux / Linux6.12.91 – 6.12.*
- Linux / Linux6.18.33 – 6.18.*
- Linux / Linux7.0.10 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/e0a0c4903cbba351f0f5b5d104960d3a5b23202f
- MISChttps://git.kernel.org/stable/c/9472d37799a0b9ff9b99639f35961ac2f0b3c9be
- MISChttps://git.kernel.org/stable/c/65e07964b4b2daf9a54e686cf0fa72d74a9648a8
- MISChttps://git.kernel.org/stable/c/b88f905d4449b70da6bda547be546e365e44352e
- MISChttps://git.kernel.org/stable/c/4525658002be3ad310b16bf8db48c8adb6a55d32
- MISChttps://git.kernel.org/stable/c/e5ff0ba4b6983cdbcc826efc201e7179ece5d46f
- MISChttps://git.kernel.org/stable/c/94094e70fe292c9566502772d4d4d6d6a99204b1
- MISChttps://git.kernel.org/stable/c/be3e5d10643d3be1cbac9d9939f220a99253f980