From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.7 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,URIBL_BLOCKED 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 14D49C43216 for ; Wed, 28 Jul 2021 04:42:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EDFF660F41 for ; Wed, 28 Jul 2021 04:42:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230377AbhG1Emt (ORCPT ); Wed, 28 Jul 2021 00:42:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:33856 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229546AbhG1Ems (ORCPT ); Wed, 28 Jul 2021 00:42:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 86E2760F41; Wed, 28 Jul 2021 04:42:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627447367; bh=dOk+2tFiWObmw55S1h9slR4A4T3f+tlYA4VqWOD2eAE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=asPRK8N64wo9bRcUDj3+v7oCKxySBOZvt/v7+Ul8CUaSzKyZPUVlLsBPnm9NGj8aL t5IuM3IQXPrHb8Yz9D1mratdKG9R7S2c6Yh0zwS5GpHg29+SDGojG4OjVqAnE7tBpM jAYxTK0V3onNdQN5uaDwZHNbxeDz3CHlU72GMmyDdw3HGwL6DH9eW9xA1/Dl42zjDN Mx5AQotOjd6cHYwVOYCdo1B2deACWPfuxLWKtXpFn4h3EM2Sw91Cq07kOjltlEe6ME 9G2X5bnCZTkzA9pUjeaTaMt7xOmJ0XcdN+dMfePsl7645X7vk6VmD2uTl+suSMo30h OeKWby67B9Y7A== Date: Tue, 27 Jul 2021 23:45:17 -0500 From: "Gustavo A. R. Silva" To: Kees Cook Cc: linux-hardening@vger.kernel.org, Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com Subject: Re: [PATCH 06/64] bnxt_en: Use struct_group_attr() for memcpy() region Message-ID: <20210728044517.GE35706@embeddedor> References: <20210727205855.411487-1-keescook@chromium.org> <20210727205855.411487-7-keescook@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210727205855.411487-7-keescook@chromium.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 27, 2021 at 01:57:57PM -0700, Kees Cook wrote: > In preparation for FORTIFY_SOURCE performing compile-time and run-time > field bounds checking for memcpy(), memmove(), and memset(), avoid > intentionally writing across neighboring fields. > > Use struct_group() around members queue_id, min_bw, max_bw, tsa, pri_lvl, > and bw_weight so they can be referenced together. This will allow memcpy() > and sizeof() to more easily reason about sizes, improve readability, > and avoid future warnings about writing beyond the end of queue_id. > > "pahole" shows no size nor member offset changes to struct bnxt_cos2bw_cfg. > "objdump -d" shows no meaningful object code changes (i.e. only source > line number induced differences and optimizations). > > Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Thanks -- Gustavo > --- > drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c | 4 ++-- > drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h | 14 ++++++++------ > 2 files changed, 10 insertions(+), 8 deletions(-) > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c > index 8a68df4d9e59..95c636f89329 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c > @@ -148,10 +148,10 @@ static int bnxt_hwrm_queue_cos2bw_qcfg(struct bnxt *bp, struct ieee_ets *ets) > } > > data = &resp->queue_id0 + offsetof(struct bnxt_cos2bw_cfg, queue_id); > - for (i = 0; i < bp->max_tc; i++, data += sizeof(cos2bw) - 4) { > + for (i = 0; i < bp->max_tc; i++, data += sizeof(cos2bw.cfg)) { > int tc; > > - memcpy(&cos2bw.queue_id, data, sizeof(cos2bw) - 4); > + memcpy(&cos2bw.cfg, data, sizeof(cos2bw.cfg)); > if (i == 0) > cos2bw.queue_id = resp->queue_id0; > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h > index 6eed231de565..716742522161 100644 > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h > @@ -23,13 +23,15 @@ struct bnxt_dcb { > > struct bnxt_cos2bw_cfg { > u8 pad[3]; > - u8 queue_id; > - __le32 min_bw; > - __le32 max_bw; > + struct_group_attr(cfg, __packed, > + u8 queue_id; > + __le32 min_bw; > + __le32 max_bw; > #define BW_VALUE_UNIT_PERCENT1_100 (0x1UL << 29) > - u8 tsa; > - u8 pri_lvl; > - u8 bw_weight; > + u8 tsa; > + u8 pri_lvl; > + u8 bw_weight; > + ); > u8 unused; > }; > > -- > 2.30.2 >