From patchwork Wed Feb 1 15:21:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Metzmacher X-Patchwork-Id: 13124590 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 544E1C636CD for ; Wed, 1 Feb 2023 15:23:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231827AbjBAPXB (ORCPT ); Wed, 1 Feb 2023 10:23:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231868AbjBAPWp (ORCPT ); Wed, 1 Feb 2023 10:22:45 -0500 Received: from hr2.samba.org (hr2.samba.org [IPv6:2a01:4f8:192:486::2:0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D8A373756; Wed, 1 Feb 2023 07:22:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=samba.org; s=42; h=Message-Id:Date:Cc:To:From; bh=/gS+o52Nxg0TkWEyh5LB7+Cdq/QCMDiQwBueylw1go4=; b=UsCJF2/D33Dz7Ve/J76UgOx5lI a5NRV+Xu38x6OaYNh1pTzLLHTab1CM1S20mXz8ai1Fp2gS08skLJErOkAbHGZDd7LUMpuKr39t+KQ tEYBpQqws63oqEgUWqSfY5ILgO+zAJSpRFl7KqMsJO2431RSWPC/Uwsee/0WQETfulbqa83m7PYEg Huh89eornzWzB78chAlZ4RSytooVJJq+4GHSGLokPo1xiJ53XkODfUhAsgBUP50FFXfzBuKT2LCdi isO7YtgopheKc73iPve48Akoq/QmoS90XHv1mWDzxYHe/siCebOlcLcAY1cv3RsgjcXo9Y0lpXo6p tFJmnwRAFIgEvu8Yk4MwOI9ytcOASTiHrEKzGjrk1PFX8+B1T1DulOhjjsMeGjcoLhleZe/VesBhJ ZJkosSmDQr05kt31UyzKmjpHqmJSj5iksE7yYOJuZt5X7ZJ7Acwon1iFPLdQHApLSw7xJgkqELCni w957rjgP3fmbkZmWIqgsHNJN; Received: from [127.0.0.2] (localhost [127.0.0.1]) by hr2.samba.org with esmtpsa (TLS1.3:ECDHE_SECP256R1__ECDSA_SECP256R1_SHA256__CHACHA20_POLY1305:256) (Exim) id 1pNEwC-00BFaB-O5; Wed, 01 Feb 2023 15:22:16 +0000 From: Stefan Metzmacher To: linux-cifs@vger.kernel.org Cc: Stefan Metzmacher , Steve French , Tom Talpey , Long Li , Namjae Jeon , David Howells , stable@vger.kernel.org Subject: [PATCH v2 3/3] cifs: don't try to use rdma offload on encrypted connections Date: Wed, 1 Feb 2023 16:21:41 +0100 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org The aim of using encryption on a connection is to keep the data confidential, so we must not use plaintext rdma offload for that data! It seems that current windows servers and ksmbd would allow this, but that's no reason to expose the users data in plaintext! And servers hopefully reject this in future. Note modern windows servers support signed or encrypted offload, see MS-SMB2 2.2.3.1.6 SMB2_RDMA_TRANSFORM_CAPABILITIES, but we don't support that yet. Signed-off-by: Stefan Metzmacher Cc: Steve French Cc: Tom Talpey Cc: Long Li Cc: Namjae Jeon Cc: David Howells Cc: linux-cifs@vger.kernel.org Cc: stable@vger.kernel.org --- fs/cifs/smb2pdu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 6a4d621241dd..c5cb2639b3f1 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -4081,6 +4081,10 @@ static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms) if (server->sign) return false; + /* we don't support encrypted offload yet */ + if (smb3_encryption_required(tcon)) + return false; + /* offload also has its overhead, so only do it if desired */ if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold) return false;