From patchwork Wed May 12 14:42:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 437119 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 5A015C43460 for ; Wed, 12 May 2021 15:11:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8DBB6162A for ; Wed, 12 May 2021 15:11:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233276AbhELPMG (ORCPT ); Wed, 12 May 2021 11:12:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:41938 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233681AbhELPKE (ORCPT ); Wed, 12 May 2021 11:10:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 86DAE61430; Wed, 12 May 2021 15:02:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620831776; bh=cSZ6jiRIpM+rhiZPSBxSI5LFsMht5N/A96dcLv926n8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nsX2ykSxM0NN3y7lPtMcGvvqMbmiuaks64fecD7aolWBt1jSoj5iBLy6s7YkCR9Mv EdubNrxcQ62Sp6+l0WGQvvhTvyQCdNv9bceCjnbJdpkztjg5lpY+j8bxcG1cO2PGIp QpvlBeSXYBLdnwHiOqf3lj4AAyUBf/CLP509uVyI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold Subject: [PATCH 5.10 011/530] USB: serial: ti_usb_3410_5052: fix TIOCSSERIAL permission check Date: Wed, 12 May 2021 16:42:01 +0200 Message-Id: <20210512144820.073868573@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144819.664462530@linuxfoundation.org> References: <20210512144819.664462530@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold commit d370c90dcd64e427a79a093a070117a1571d4cd8 upstream. Changing the port closing-wait parameter is a privileged operation so make sure to return -EPERM if a regular user tries to change it. Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/ti_usb_3410_5052.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -1420,14 +1420,19 @@ static int ti_set_serial_info(struct tty struct serial_struct *ss) { struct usb_serial_port *port = tty->driver_data; - struct ti_port *tport = usb_get_serial_port_data(port); + struct tty_port *tport = &port->port; unsigned cwait; cwait = ss->closing_wait; if (cwait != ASYNC_CLOSING_WAIT_NONE) cwait = msecs_to_jiffies(10 * ss->closing_wait); - tport->tp_port->port.closing_wait = cwait; + if (!capable(CAP_SYS_ADMIN)) { + if (cwait != tport->closing_wait) + return -EPERM; + } + + tport->closing_wait = cwait; return 0; }