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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 40891C43215 for ; Thu, 21 Nov 2019 22:23:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 131E5206D7 for ; Thu, 21 Nov 2019 22:23:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 131E5206D7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AAD686B039B; Thu, 21 Nov 2019 17:23:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A5DFC6B039C; Thu, 21 Nov 2019 17:23:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 99B616B039D; Thu, 21 Nov 2019 17:23:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0127.hostedemail.com [216.40.44.127]) by kanga.kvack.org (Postfix) with ESMTP id 81D306B039B for ; Thu, 21 Nov 2019 17:23:13 -0500 (EST) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 4499A181AEF1E for ; Thu, 21 Nov 2019 22:23:13 +0000 (UTC) X-FDA: 76181711466.06.coat41_907f2dcaca061 X-HE-Tag: coat41_907f2dcaca061 X-Filterd-Recvd-Size: 1776 Received: from relay.sw.ru (relay.sw.ru [185.231.240.75]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Thu, 21 Nov 2019 22:23:12 +0000 (UTC) Received: from [192.168.15.154] by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1iXuqu-0007wC-R0; Fri, 22 Nov 2019 01:23:04 +0300 Subject: Re: [PATCH v4 2/2] kasan: add test for invalid size in memmove To: Walter Wu , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wsd_upstream , linux-mediatek@lists.infradead.org, Andrew Morton References: <20191112065313.7060-1-walter-zh.wu@mediatek.com> From: Andrey Ryabinin Message-ID: <619b898f-f9c2-1185-5ea7-b9bf21924942@virtuozzo.com> Date: Fri, 22 Nov 2019 01:21:17 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20191112065313.7060-1-walter-zh.wu@mediatek.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 11/12/19 9:53 AM, Walter Wu wrote: > Test negative size in memmove in order to verify whether it correctly > get KASAN report. > > Casting negative numbers to size_t would indeed turn up as a large > size_t, so it will have out-of-bounds bug and be detected by KASAN. > > Signed-off-by: Walter Wu > Reviewed-by: Dmitry Vyukov Reviewed-by: Andrey Ryabinin