CVE ID : CVE-2024-33847
Published : June 24, 2024, 2:15 p.m. | 1 hour, 5 minutes ago
Description : 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.
Severity: 0.0 | NA
Visit the link for more details, such as CVSS details, affected products, timeline, and more…CVE ID : CVE-2024-33847
Published : June 24, 2024, 2:15 p.m. | 1 hour, 5 minutes ago
Description : 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.
Severity: 0.0 | NA
Visit the link for more details, such as CVSS details, affected products, timeline, and more…