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 84DD2C10F27 for ; Wed, 11 Mar 2020 14:18:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 61F17222C3 for ; Wed, 11 Mar 2020 14:18:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729825AbgCKOSw (ORCPT ); Wed, 11 Mar 2020 10:18:52 -0400 Received: from foss.arm.com ([217.140.110.172]:50274 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729656AbgCKOSw (ORCPT ); Wed, 11 Mar 2020 10:18:52 -0400 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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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