From patchwork Wed Apr 7 10:28:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12187657 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04EB3C433B4 for ; Wed, 7 Apr 2021 10:29:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C4021613AF for ; Wed, 7 Apr 2021 10:29:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232747AbhDGK3U (ORCPT ); Wed, 7 Apr 2021 06:29:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:46116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233353AbhDGK3L (ORCPT ); Wed, 7 Apr 2021 06:29:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 43B286139C; Wed, 7 Apr 2021 10:29:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617791342; bh=lsyrtIigVOizPgWs0iXL/uoRm3JMsiE4v9eha+Vtaso=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c9m2PHu6WalK4rMS2yp8AZ0JdEjYqoyCcw87aPccXMHJZ89/ImPmi8mOJ1Cknpfnr StJl6H/fY/L9Xcx/EapU975Nft/IAlViVRawL7s1o0B986DHOlJhcZtBVtcLJj2shq VBefZSF3fiMKQ3gbSeoRaJBgFf+29odJ6jfgjM9dtnrJLhvXHmn+HkgVCRMr0EiWhW ryhpTZYwf14nQTTQEzxBcG2+Da+cTOVa3A4qJSXQkpB9K82NZJXJ+sVwwYSsd/3WQK rY9zzwmI0TJStPt1QvgXdHZLZybRjmrqHJ9d0XabS+T+rkQxpTwGclCFibZFlpGldL EZe+nn0mOzoxA== Received: from johan by xi.lan with local (Exim 4.93.0.4) (envelope-from ) id 1lU5Qc-00004u-Pe; Wed, 07 Apr 2021 12:28:54 +0200 From: Johan Hovold To: Greg Kroah-Hartman Cc: Oliver Neukum , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH 2/3] USB: cdc-acm: fix unprivileged TIOCCSERIAL Date: Wed, 7 Apr 2021 12:28:44 +0200 Message-Id: <20210407102845.32720-3-johan@kernel.org> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210407102845.32720-1-johan@kernel.org> References: <20210407102845.32720-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. A non-privileged user has only ever been able to set the since long deprecated ASYNC_SPD flags and trying to change any other *supported* feature should result in -EPERM being returned. Setting the current values for any supported features should return success. Fix the cdc-acm implementation which instead indicated that the TIOCSSERIAL ioctl was not even implemented when a non-privileged user set the current values. Fixes: ba2d8ce9db0a ("cdc-acm: implement TIOCSSERIAL to avoid blocking close(2)") Signed-off-by: Johan Hovold --- drivers/usb/class/cdc-acm.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 96e221803fa6..43e31dad4831 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -955,8 +955,6 @@ static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) if ((close_delay != acm->port.close_delay) || (closing_wait != acm->port.closing_wait)) retval = -EPERM; - else - retval = -EOPNOTSUPP; } else { acm->port.close_delay = close_delay; acm->port.closing_wait = closing_wait;