From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C10C424B34; Tue, 16 Jan 2024 01:07:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I71KF8eC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4812C433F1; Tue, 16 Jan 2024 01:07:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705367225; bh=/WAHI9k0/jbUSpT8uafSK1Q7FDl154jdzd0/RW07pfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I71KF8eC8YX1yRb1SxtEw/ubaA84bOwmhiGzTaTb2QaCMGmTlx7h84clX0pXmzemN UFfY5LCtnXg+7Oe41xBQkLSaMLzUfEJBzooHzgGF0RJhfK7Y30YksC4D2gnuuHn464 n1ZhZklw/TpL70mPQNf+n3XdXQib4PlIgmD4H8FZwxyUryNUO4ffN/pRfzxv7ffrl+ 631/BE+etY+Ov5AYYKCZpyxLnPKRFRyqFMzb+zEOlFcGCeFQVwtFQjK5eMnwr+17aZ 5O5tGIhyYKVcMX9xKlZoy8G7JeAmNAoBix/bmDaPnKl15MqBsDitnWpSojlOW+fGRw 0K4SrP3L7K23g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Gabriel Krisman Bertazi , Eric Biggers , Sasha Levin , code@tyhicks.com, brauner@kernel.org, dchinner@redhat.com, jack@suse.cz, 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> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240116010642.218876-1-sashal@kernel.org> References: <20240116010642.218876-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.73 Content-Transfer-Encoding: 8bit From: Gabriel Krisman Bertazi [ 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 Reviewed-by: Eric Biggers Signed-off-by: Sasha Levin --- 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