In the Linux kernel, the following vulnerability has been resolved:
f2fs: compress: don't allow unaligned truncation on released compress inode
f2fs image may be corrupted after below testcase:
- mkfs.f2fs -O extra_attr,compression -f /dev/vdb
- mount /dev/vdb /mnt/f2fs
- touch /mnt/f2fs/file
- f2fs_io setflags compression /mnt/f2fs/file
- dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4
- f2fs_io release_cblocks /mnt/f2fs/file
- truncate -s 8192 /mnt/f2fs/file
- umount /mnt/f2fs
- fsck.f2fs /dev/vdb
[ASSERT] (fsck_chk_inode_blk:1256) --> ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks
[FSCK] valid_block_count matching with CP [Fail] [0x4, 0x5]
[FSCK] other corrupted bugs [Fail]
The reason is: partial truncation assume compressed inode has reserved
blocks, after partial truncation, valid block count may change w/o
.i_blocks and .total_valid_block_count update, result in corruption.
This patch only allow cluster size aligned truncation on released
compress inode for fixing.
Metrics
Affected Vendors & Products
References
History
Wed, 06 Nov 2024 20:15:00 +0000
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-06-24T13:56:48.723Z
Updated: 2024-12-19T08:55:00.893Z
Reserved: 2024-06-24T13:54:11.027Z
Link: CVE-2024-33847
Vulnrichment
Updated: 2024-08-02T02:42:58.909Z
NVD
Status : Awaiting Analysis
Published: 2024-06-24T14:15:11.803
Modified: 2024-11-21T09:17:34.583
Link: CVE-2024-33847
Redhat