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 7472169D21; Wed, 21 Feb 2024 13:33:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708522421; cv=none; b=f6asXjJLvqHRcSAQWNj7lzoxM+edqhe6Az69CVnDzuzZSQa5aN+sFzvJiNw+rElnW23VLUythzhk8CIHcVZ0ilEiUJittODNkgQP4y9kmFe5iqfXxn7QtvAb1v2fQXVlH2TnzPGR9vhkri4VgL5IvPCUIOTqMqBMCRS1/pPT7as= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708522421; c=relaxed/simple; bh=nQ5wuBZocZxytnQh++YdjBifz0ucFIE7Ha9PmtDXfCk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q+/j8TmgMm2Yw/3yu5cbBQm4It7WIfyPyKcMdoj9cwiMJc9007mu9GgZXvtcT/po4YbOkD1atB7zb6AV7SxKIHt9JLq2b50WkSdCLTtJjc5sFZelPiUB/iaz4MBHqq+fMvcB4ztjFj37R5JR11+2KzHUQoMdhUuybkrAOY9QtFs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JZ97iLFm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JZ97iLFm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86066C433F1; Wed, 21 Feb 2024 13:33:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708522421; bh=nQ5wuBZocZxytnQh++YdjBifz0ucFIE7Ha9PmtDXfCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JZ97iLFmE+oC3QZp3/DSYGmNBAlMVFH7r/ALeHWwW7GkmkemBKKY8vYk2VLj5gkXO 0BaeG/pFLneUwcqRWo2SHVDM4xD/b07FsZbgHyUtLWwOMyNcALSmbtoLiwvy4NmsgP ZIgQqkbT+ck5jiGlpoNdFLSs46A7UHgxyuItl4kg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Gabriel Krisman Bertazi , Eric Biggers , Sasha Levin Subject: [PATCH 5.15 160/476] ecryptfs: Reject casefold directory inodes Date: Wed, 21 Feb 2024 14:03:31 +0100 Message-ID: <20240221130013.851006472@linuxfoundation.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240221130007.738356493@linuxfoundation.org> References: <20240221130007.738356493@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ 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 16d50dface59..bea4c2b0cd6b 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