From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1424377AbeE1LOI (ORCPT ); Mon, 28 May 2018 07:14:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:33252 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1424331AbeE1LN4 (ORCPT ); Mon, 28 May 2018 07:13:56 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dong Jia Shi , Halil Pasic , Cornelia Huck , Sasha Levin Subject: [PATCH 4.16 218/272] vfio-ccw: fence off transport mode Date: Mon, 28 May 2018 12:04:11 +0200 Message-Id: <20180528100258.787667068@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180528100240.256525891@linuxfoundation.org> References: <20180528100240.256525891@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cornelia Huck [ Upstream commit 9851bc77e62499957567e7c39a5beba7d6de6296 ] vfio-ccw only supports command mode for channel programs, not transport mode. User space is supposed to already take care of that and pass us command-mode ORBs only, but better make sure and return an error to the caller instead of trying to process tcws as ccws. Reviewed-by: Dong Jia Shi Acked-by: Halil Pasic Signed-off-by: Cornelia Huck Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/s390/cio/vfio_ccw_fsm.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/s390/cio/vfio_ccw_fsm.c +++ b/drivers/s390/cio/vfio_ccw_fsm.c @@ -129,6 +129,11 @@ static void fsm_io_request(struct vfio_c if (scsw->cmd.fctl & SCSW_FCTL_START_FUNC) { orb = (union orb *)io_region->orb_area; + /* Don't try to build a cp if transport mode is specified. */ + if (orb->tm.b) { + io_region->ret_code = -EOPNOTSUPP; + goto err_out; + } io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev), orb); if (io_region->ret_code)