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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_SANE_2 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 5B299C3A5A7 for ; Wed, 4 Sep 2019 14:16:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3AEBE22CEA for ; Wed, 4 Sep 2019 14:16:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730737AbfIDOQp (ORCPT ); Wed, 4 Sep 2019 10:16:45 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:25007 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727417AbfIDOQo (ORCPT ); Wed, 4 Sep 2019 10:16:44 -0400 X-UUID: ec6f2baf4842498f92829352c925dd9a-20190904 X-UUID: ec6f2baf4842498f92829352c925dd9a-20190904 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw02.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 2114202653; Wed, 04 Sep 2019 22:16:40 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 4 Sep 2019 22:16:38 +0800 Received: from [172.21.84.99] (172.21.84.99) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 4 Sep 2019 22:16:30 +0800 Message-ID: <1567606591.32522.21.camel@mtksdccf07> Subject: Re: [PATCH 1/2] mm/kasan: dump alloc/free stack for page allocator From: Walter Wu To: Andrey Konovalov CC: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrew Morton , "Martin Schwidefsky" , Arnd Bergmann , kasan-dev , Linux Memory Management List , LKML , Linux ARM , , Date: Wed, 4 Sep 2019 22:16:31 +0800 In-Reply-To: References: <20190904065133.20268-1-walter-zh.wu@mediatek.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-MTK: N Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2019-09-04 at 15:44 +0200, Andrey Konovalov wrote: > On Wed, Sep 4, 2019 at 8:51 AM Walter Wu wrote: > > +config KASAN_DUMP_PAGE > > + bool "Dump the page last stack information" > > + depends on KASAN && PAGE_OWNER > > + help > > + By default, KASAN doesn't record alloc/free stack for page allocator. > > + It is difficult to fix up page use-after-free issue. > > + This feature depends on page owner to record the last stack of page. > > + It is very helpful for solving the page use-after-free or out-of-bound. > > I'm not sure if we need a separate config for this. Is there any > reason to not have this enabled by default? PAGE_OWNER need some memory usage, it is not allowed to enable by default in low RAM device. so I create new feature option and the person who wants to use it to enable it. Thanks. Walter