From: Chao Yu chao@kernel.org
stable inclusion from stable-v5.10.209 commit 6f866885e147d33efc497f1095f35b2ee5ec7310 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I932VP CVE: CVE-2023-52444
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 53edb549565f55ccd0bdf43be3d66ce4c2d48b28 ]
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]
Fixes: 7e01e7ad746b ("f2fs: support RENAME_WHITEOUT") Cc: Jan Kara jack@suse.cz Reported-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Chao Yu chao@kernel.org Reviewed-by: Jan Kara jack@suse.cz Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zizhi Wo wozizhi@huawei.com --- fs/f2fs/namei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 72b109685db4..99e4ec48d2a4 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -1066,7 +1066,7 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, }
if (old_dir_entry) { - if (old_dir != new_dir && !whiteout) + if (old_dir != new_dir) f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); else