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ecryptfs: Reject casefold directory inodes

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[ Upstream commit cd72c7ef5f ]

Even though it seems to be able to resolve some names of
case-insensitive directories, the lack of d_hash and d_compare means we
end up with a broken state in the d_cache.  Considering it was never a
goal to support these two together, and we are preparing to use
d_revalidate in case-insensitive filesystems, which would make the
combination even more broken, reject any attempt to get a casefolded
inode from ecryptfs.

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gabriel Krisman Bertazi 2023-08-11 14:38:12 -04:00 committed by Greg Kroah-Hartman
parent c430e6bb43
commit 5183595c0b
1 changed files with 8 additions and 0 deletions
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8
fs/ecryptfs/inode.c
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@ -76,6 +76,14 @@ static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
return ERR_PTR(-EXDEV);
/* Reject dealing with casefold directories. */
if (IS_CASEFOLDED(lower_inode)) {
pr_err_ratelimited("%s: Can't handle casefolded directory.\n",
__func__);
return ERR_PTR(-EREMOTE);
}
if (!igrab(lower_inode))
return ERR_PTR(-ESTALE);
inode = iget5_locked(sb, (unsigned long)lower_inode,