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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Gabriel Krisman Bertazi <krisman@suse.de>,
	Eric Biggers <ebiggers@google.com>,
	Sasha Levin <sashal@kernel.org>,
	code@tyhicks.com,
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	jlayton@kernel.org,
	walmeida@microsoft.com,
	stefanb@linux.ibm.com,
	viro@zeniv.linux.org.uk,
	ecryptfs@vger.kernel.org
Subject: [PATCH AUTOSEL 6.1 10/14] ecryptfs: Reject casefold directory inodes
Date: Mon, 15 Jan 2024 20:06:12 -0500
Message-ID: <20240116010642.218876-10-sashal@kernel.org>
In-Reply-To: <20240116010642.218876-1-sashal@kernel.org>
References: <20240116010642.218876-1-sashal@kernel.org>
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From: Gabriel Krisman Bertazi <krisman@suse.de>

[ 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@suse.de>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ecryptfs/inode.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index c214fe0981bd..55340ac61456 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -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,
-- 
2.43.0