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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 46032CA9ECE for ; Thu, 31 Oct 2019 18:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 210712173E for ; Thu, 31 Oct 2019 18:16:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729258AbfJaSQx (ORCPT ); Thu, 31 Oct 2019 14:16:53 -0400 Received: from smtprelay0231.hostedemail.com ([216.40.44.231]:40826 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726602AbfJaSQw (ORCPT ); Thu, 31 Oct 2019 14:16:52 -0400 Received: from filter.hostedemail.com (clb03-v110.bra.tucows.net [216.40.38.60]) by smtprelay06.hostedemail.com (Postfix) with ESMTP id 354811822563C; Thu, 31 Oct 2019 18:16:51 +0000 (UTC) X-Session-Marker: 6A6F6540706572636865732E636F6D X-HE-Tag: sea16_75aca35dfcc57 X-Filterd-Recvd-Size: 1678 Received: from XPS-9350.home (unknown [47.151.135.224]) (Authenticated sender: joe@perches.com) by omf14.hostedemail.com (Postfix) with ESMTPA; Thu, 31 Oct 2019 18:16:48 +0000 (UTC) Message-ID: <734ef2833e4e4e7bded92e9d964bc2415aadf3c4.camel@perches.com> Subject: Re: [PATCH] fbdev: potential information leak in do_fb_ioctl() From: Joe Perches To: Andrea Righi , "Eric W. Biederman" Cc: Dan Carpenter , Bartlomiej Zolnierkiewicz , Daniel Vetter , Sam Ravnborg , Maarten Lankhorst , Peter Rosin , Gerd Hoffmann , dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, security@kernel.org, Kees Cook , Julia Lawall Date: Thu, 31 Oct 2019 11:16:39 -0700 In-Reply-To: <20191030201201.GA3209@xps-13> References: <20191029182320.GA17569@mwanda> <87zhhjjryk.fsf@x220.int.ebiederm.org> <20191030074321.GD2656@xps-13> <87r22ujaqq.fsf@x220.int.ebiederm.org> <20191030201201.GA3209@xps-13> Content-Type: text/plain; charset="ISO-8859-1" User-Agent: Evolution 3.34.1-2 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2019-10-30 at 21:12 +0100, Andrea Righi wrote: > Then memset() + memcpy() is probably the best option, > since copying all those fields one by one looks quite ugly to me... A memset of an automatic before a memcpy to the same automatic is unnecessary.