- Vulnerability/
- CVE-2024-33847
CVE-2024-33847: f2fs: compress: don't allow unaligned truncation on released compress inode
First published: Mon Jun 24 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/29ed2b5dd521ce7c5d8466cd70bf0cc9d07afeee
- https://git.kernel.org/stable/c/3ccf5210dc941a7aa0180596ac021568be4d35ec
- https://git.kernel.org/stable/c/5268241b41b1c5d0acca75e9b97d4fd719251c8c
- https://git.kernel.org/stable/c/8acae047215024d1ac499b3c8337ef1b952f160b
- https://git.kernel.org/stable/c/9f9341064a9b5246a32a7fe56b9f80c6f7f3c62d
- https://git.kernel.org/stable/c/b8962cf98595d1ec62f40f23667de830567ec8bc
- https://launchpad.net/bugs/cve/CVE-2024-33847
- https://git.kernel.org/linus/29ed2b5dd521ce7c5d8466cd70bf0cc9d07afeee
- https://security-tracker.debian.org/tracker/CVE-2024-33847
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-33847
- https://nvd.nist.gov/vuln/detail/CVE-2024-33847
- https://ubuntu.com/security/CVE-2024-33847
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