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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 BBA36C18E5A for ; Wed, 11 Mar 2020 14:18:53 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9347220727 for ; Wed, 11 Mar 2020 14:18:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9347220727 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2F38B6B0003; Wed, 11 Mar 2020 10:18:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2CA596B0006; Wed, 11 Mar 2020 10:18:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1B97A6B0007; Wed, 11 Mar 2020 10:18:53 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0066.hostedemail.com [216.40.44.66]) by kanga.kvack.org (Postfix) with ESMTP id 052836B0003 for ; Wed, 11 Mar 2020 10:18:53 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id E26274DBC for ; Wed, 11 Mar 2020 14:18:52 +0000 (UTC) X-FDA: 76583287704.15.cry82_3063652ea3711 X-HE-Tag: cry82_3063652ea3711 X-Filterd-Recvd-Size: 1809 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Mar 2020 14:18:52 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6EBC931B; Wed, 11 Mar 2020 07:18:51 -0700 (PDT) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.71]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A4A993F67D; Wed, 11 Mar 2020 07:18:50 -0700 (PDT) Date: Wed, 11 Mar 2020 14:18:48 +0000 From: Catalin Marinas To: Qian Cai Cc: akpm@linux-foundation.org, elver@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH -next 1/2] mm: disable KCSAN for kmemleak Message-ID: <20200311141848.GG3216816@arrakis.emea.arm.com> References: <1583263716-25150-1-git-send-email-cai@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1583263716-25150-1-git-send-email-cai@lca.pw> 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 Tue, Mar 03, 2020 at 02:28:35PM -0500, Qian Cai wrote: > Kmemleak could scan task stacks while plain writes happens to those > stack variables which could results in data races. For example, in > sys_rt_sigaction and do_sigaction(), it could have plain writes in > a 32-byte size. Since the kmemleak does not care about the actual values > of a non-pointer and all do_sigaction() call sites only copy to stack > variables, just disable KCSAN for kmemleak to avoid annotating anything > outside Kmemleak just because Kmemleak scans everything. > > Suggested-by: Marco Elver > Signed-off-by: Qian Cai Acked-by: Catalin Marinas