Patch "ecryptfs: Reject casefold directory inodes" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    ecryptfs: Reject casefold directory inodes

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ecryptfs-reject-casefold-directory-inodes.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 1068dc70825ffb4170e4954cbee11fb8a5d68cbc
Author: Gabriel Krisman Bertazi <krisman@xxxxxxx>
Date:   Fri Aug 11 14:38:12 2023 -0400

    ecryptfs: Reject casefold directory inodes
    
    [ Upstream commit cd72c7ef5fed44272272a105b1da22810c91be69 ]
    
    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@xxxxxxx>
    Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 5ab4b87888a7..795e9fe2f721 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -78,6 +78,14 @@ 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,




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