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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 37ABAC43331 for ; Thu, 2 Apr 2020 04:04:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E201C20747 for ; Thu, 2 Apr 2020 04:04:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="IH0HLyF2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E201C20747 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 94A178E001C; Thu, 2 Apr 2020 00:04:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8FABA8E000D; Thu, 2 Apr 2020 00:04:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 810A98E001C; Thu, 2 Apr 2020 00:04:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0211.hostedemail.com [216.40.44.211]) by kanga.kvack.org (Postfix) with ESMTP id 670B58E000D for ; Thu, 2 Apr 2020 00:04:39 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 2B58E181AC9CC for ; Thu, 2 Apr 2020 04:04:39 +0000 (UTC) X-FDA: 76661573478.19.pail45_2895687b74f08 X-HE-Tag: pail45_2895687b74f08 X-Filterd-Recvd-Size: 2669 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Thu, 2 Apr 2020 04:04:38 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CEE71206E9; Thu, 2 Apr 2020 04:04:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585800278; bh=iokQAMgUgFKObIpoc4lM7jqbOg/wam/VqNVOmDPJcMU=; h=Date:From:To:Subject:In-Reply-To:From; b=IH0HLyF2tucf9eywI8fdG9vvIbSUQVx4qkOVIWSt89AZgbkwFuAGypi3qtFBNyNnh OCT/DaHMNtxwKZsUMBENWbI1vl91hm7XkA1/akpw8ny3MaYZRHWyqmSd66yn+sktxd SbPJoPaiaN1E5hdziicovZC3wPVnNSi6tEXYjF2M= Date: Wed, 01 Apr 2020 21:04:37 -0700 From: Andrew Morton To: akpm@linux-foundation.org, cai@lca.pw, catalin.marinas@arm.com, elver@google.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 028/155] mm/Makefile: disable KCSAN for kmemleak Message-ID: <20200402040437.fy8hlNigx%akpm@linux-foundation.org> In-Reply-To: <20200401210155.09e3b9742e1c6e732f5a7250@linux-foundation.org> User-Agent: s-nail v14.8.16 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: From: Qian Cai Subject: mm/Makefile: disable KCSAN for kmemleak 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. Link: http://lkml.kernel.org/r/1583263716-25150-1-git-send-email-cai@lca.pw Signed-off-by: Qian Cai Suggested-by: Marco Elver Acked-by: Marco Elver Acked-by: Catalin Marinas Signed-off-by: Andrew Morton --- mm/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/mm/Makefile~mm-disable-kcsan-for-kmemleak +++ a/mm/Makefile @@ -6,6 +6,7 @@ KASAN_SANITIZE_slab_common.o := n KASAN_SANITIZE_slab.o := n KASAN_SANITIZE_slub.o := n +KCSAN_SANITIZE_kmemleak.o := n # These files are disabled because they produce non-interesting and/or # flaky coverage that is not a function of syscall inputs. E.g. slab is out of _