CVE-2023-52444 Information

Feb 23, 2024 cve

Description

In the Linux kernel the following vulnerability has been resolved:

f2fs: fix to avoid dirent corruption

As Al reported in link[1]:

f2fs_rename() … if (old_dir != new_dir && !whiteout) f2fs_set_link(old_inode old_dir_entry old_dir_page new_dir); else f2fs_put_page(old_dir_page 0);

You want correct inumber in the ..\ link. And cross-directory rename does move the source to new parent even if you’d been asked to leave a whiteout in the old place.

[1] https://lore.kernel.org/all/20231017055040.GN800259@ZenIV/

With below testcase it may cause dirent corruption due to it missed to call f2fs_set_link() to update ..\ link to new directory.

mkdir -p dir/foo
renameat2 -w dir/foo bar

[ASSERT] (__chk_dots_dentries:1421) –> Bad inode number[0x4] for ‘..’ parent parent ino is [0x3] [FSCK] other corrupted bugs [Fail]

Reference

Share on: