From patchwork Sat Apr 11 12:09:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 228048 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 1A086C2BA2B for ; Sat, 11 Apr 2020 12:22:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D9D332084D for ; Sat, 11 Apr 2020 12:22:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586607777; bh=EmfY0OTG7JZDE8KriKilKrAHF7WbXWBGs5/1e/lrTow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NejnM7cj4qUH6Lw4Hdw5JsAa4idxVr+XvMH2jMnAD98eKg3ClsXmTXTzR43ZaX+6A 9tVaGaGFIl1Txg3E1EbKluORwULjUjmf4MK7+JhhMPZZyKTzAYIw+oNzc4SYfXbEip 5FOdB6w7zQBEhJYRvgY5odtTURePjLZgZapbqtJY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728040AbgDKMUY (ORCPT ); Sat, 11 Apr 2020 08:20:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:56274 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727608AbgDKMUY (ORCPT ); Sat, 11 Apr 2020 08:20:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E818B206A1; Sat, 11 Apr 2020 12:20:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586607624; bh=EmfY0OTG7JZDE8KriKilKrAHF7WbXWBGs5/1e/lrTow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v6aLCaqP9wyEb2aRC3zIo1S0A8K0m8J8q9kdgAO98c+AD65pkF8B+VWrBHFxWdbpk wJFk77sS/oh8vrVBkVFm3RArqis+V1flLstiIoYPIezgdqoJ2sn9r/OmCPEF7bMON/ L/blNwEVAoTJQ7aRZS9ODM8KoSQjGa0Du+Yow8yY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Richard Palethorpe , Kees Cook , linux-can@vger.kernel.org, netdev@vger.kernel.org, security@kernel.org, wg@grandegger.com, mkl@pengutronix.de, davem@davemloft.net Subject: [PATCH 5.6 10/38] slcan: Dont transmit uninitialized stack data in padding Date: Sat, 11 Apr 2020 14:09:47 +0200 Message-Id: <20200411115500.480070777@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200411115459.324496182@linuxfoundation.org> References: <20200411115459.324496182@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Richard Palethorpe [ Upstream commit b9258a2cece4ec1f020715fe3554bc2e360f6264 ] struct can_frame contains some padding which is not explicitly zeroed in slc_bump. This uninitialized data will then be transmitted if the stack initialization hardening feature is not enabled (CONFIG_INIT_STACK_ALL). This commit just zeroes the whole struct including the padding. Signed-off-by: Richard Palethorpe Fixes: a1044e36e457 ("can: add slcan driver for serial/USB-serial CAN adapters") Reviewed-by: Kees Cook Cc: linux-can@vger.kernel.org Cc: netdev@vger.kernel.org Cc: security@kernel.org Cc: wg@grandegger.com Cc: mkl@pengutronix.de Cc: davem@davemloft.net Acked-by: Marc Kleine-Budde Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/slcan.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/net/can/slcan.c +++ b/drivers/net/can/slcan.c @@ -148,7 +148,7 @@ static void slc_bump(struct slcan *sl) u32 tmpid; char *cmd = sl->rbuff; - cf.can_id = 0; + memset(&cf, 0, sizeof(cf)); switch (*cmd) { case 'r': @@ -187,8 +187,6 @@ static void slc_bump(struct slcan *sl) else return; - *(u64 *) (&cf.data) = 0; /* clear payload */ - /* RTR frames may have a dlc > 0 but they never have any data bytes */ if (!(cf.can_id & CAN_RTR_FLAG)) { for (i = 0; i < cf.can_dlc; i++) {