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=-17.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 2771AC43216 for ; Wed, 28 Jul 2021 09:02:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E34860F91 for ; Wed, 28 Jul 2021 09:02:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235367AbhG1JCK (ORCPT ); Wed, 28 Jul 2021 05:02:10 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:42376 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234163AbhG1JCJ (ORCPT ); Wed, 28 Jul 2021 05:02:09 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 2DF0A22262; Wed, 28 Jul 2021 09:02:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1627462927; h=from:from:reply-to:reply-to:date:date:message-id:message-id:to:to: cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=sp2fXaO4+VkU0ewmSUxyDBIfoqxWZ/YmzoRuKp72TwU=; b=QJtqaRDeD/r+6BS2RpMLHsBckRf2sr1w3iN33pezOooEqpnn8T7DqSapcRxyMPIZfjRSjm 7J+1lee9yCSAoX/yXx5qOnlJlNQlP5/7ZOeqDMcdtfzJJyxwr5G3M0hN/eM3VNhe4zl7mM ShgAu0K7CLyKCgHUkgVaDq862Mit+3M= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1627462927; h=from:from:reply-to:reply-to:date:date:message-id:message-id:to:to: cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=sp2fXaO4+VkU0ewmSUxyDBIfoqxWZ/YmzoRuKp72TwU=; b=pmBfIB2QkmA3xf4kSvM/Kul+M1rkY2xpWB6cH5WhgISANis+5+m+8zDuM/QuNvL/ktFiFp tiOqD9YAirWKVzAw== Received: from ds.suse.cz (ds.suse.cz [10.100.12.205]) by relay2.suse.de (Postfix) with ESMTP id 15362A3B8B; Wed, 28 Jul 2021 09:02:07 +0000 (UTC) Received: by ds.suse.cz (Postfix, from userid 10065) id 4CA03DA8A7; Wed, 28 Jul 2021 10:59:22 +0200 (CEST) Date: Wed, 28 Jul 2021 10:59:22 +0200 From: David Sterba To: Kees Cook Cc: linux-hardening@vger.kernel.org, "Gustavo A. R. Silva" , 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, nborisov@suse.com Subject: Re: [PATCH 01/64] media: omap3isp: Extract struct group for memcpy() region Message-ID: <20210728085921.GV5047@twin.jikos.cz> Reply-To: dsterba@suse.cz Mail-Followup-To: dsterba@suse.cz, Kees Cook , linux-hardening@vger.kernel.org, "Gustavo A. R. Silva" , 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, nborisov@suse.com References: <20210727205855.411487-1-keescook@chromium.org> <20210727205855.411487-2-keescook@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210727205855.411487-2-keescook@chromium.org> User-Agent: Mutt/1.5.23.1-rc1 (2014-03-12) Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On Tue, Jul 27, 2021 at 01:57:52PM -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. Wrap the target region > in a common named structure. This additionally fixes a theoretical > misalignment of the copy (since the size of "buf" changes between 64-bit > and 32-bit, but this is likely never built for 64-bit). > > FWIW, I think this code is totally broken on 64-bit (which appears to > not be a "real" build configuration): it would either always fail (with > an uninitialized data->buf_size) or would cause corruption in userspace > due to the copy_to_user() in the call path against an uninitialized > data->buf value: > > omap3isp_stat_request_statistics_time32(...) > struct omap3isp_stat_data data64; > ... > omap3isp_stat_request_statistics(stat, &data64); > > int omap3isp_stat_request_statistics(struct ispstat *stat, > struct omap3isp_stat_data *data) > ... > buf = isp_stat_buf_get(stat, data); > > static struct ispstat_buffer *isp_stat_buf_get(struct ispstat *stat, > struct omap3isp_stat_data *data) > ... > if (buf->buf_size > data->buf_size) { > ... > return ERR_PTR(-EINVAL); > } > ... > rval = copy_to_user(data->buf, > buf->virt_addr, > buf->buf_size); > > Regardless, additionally initialize data64 to be zero-filled to avoid > undefined behavior. > > Fixes: 378e3f81cb56 ("media: omap3isp: support 64-bit version of omap3isp_stat_data") > Signed-off-by: Kees Cook > --- > drivers/media/platform/omap3isp/ispstat.c | 5 +-- > include/uapi/linux/omap3isp.h | 44 +++++++++++++++++------ > 2 files changed, 36 insertions(+), 13 deletions(-) > > diff --git a/drivers/media/platform/omap3isp/ispstat.c b/drivers/media/platform/omap3isp/ispstat.c > index 5b9b57f4d9bf..ea8222fed38e 100644 > --- a/drivers/media/platform/omap3isp/ispstat.c > +++ b/drivers/media/platform/omap3isp/ispstat.c > @@ -512,7 +512,7 @@ int omap3isp_stat_request_statistics(struct ispstat *stat, > int omap3isp_stat_request_statistics_time32(struct ispstat *stat, > struct omap3isp_stat_data_time32 *data) > { > - struct omap3isp_stat_data data64; > + struct omap3isp_stat_data data64 = { }; Should this be { 0 } ? We've seen patches trying to switch from { 0 } to { } but the answer was that { 0 } is supposed to be used, http://www.ex-parrot.com/~chris/random/initialise.html (from https://lore.kernel.org/lkml/fbddb15a-6e46-3f21-23ba-b18f66e3448a@suse.com/)