f2fs: compress: don't allow unaligned truncation on released compress inode
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.15.161, 6.1.93, 6.6.33, 6.9.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From 8e1651cd667cd6779db28314844d88b6de8312a3 · fixed in b8962cf98595d1ec62f40f23667de830567ec8bc; From c61404153eb683da9c35aad133131554861ed561 · fixed in 8acae047215024d1ac499b3c8337ef1b952f160b; From c61404153eb683da9c35aad133131554861ed561 · fixed in 3ccf5210dc941a7aa0180596ac021568be4d35ec; From c61404153eb683da9c35aad133131554861ed561 · fixed in 9f9341064a9b5246a32a7fe56b9f80c6f7f3c62d; From c61404153eb683da9c35aad133131554861ed561 · fixed in 5268241b41b1c5d0acca75e9b97d4fd719251c8c; From c61404153eb683da9c35aad133131554861ed561 · fixed in 29ed2b5dd521ce7c5d8466cd70bf0cc9d07afeee
- Linux Linux
5.14
- KernelLinux
From 5.14.0 · fixed in 5.15.161; From 5.16.0 · fixed in 6.1.93; From 6.2.0 · fixed in 6.6.33; From 6.7.0 · fixed in 6.9.4