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=-9.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 136A4C3F2C6 for ; Tue, 3 Mar 2020 19:28:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E020F21556 for ; Tue, 3 Mar 2020 19:28:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="W392SK/v" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730960AbgCCT2y (ORCPT ); Tue, 3 Mar 2020 14:28:54 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:45167 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729690AbgCCT2y (ORCPT ); Tue, 3 Mar 2020 14:28:54 -0500 Received: by mail-qk1-f196.google.com with SMTP id z12so4566668qkg.12 for ; Tue, 03 Mar 2020 11:28:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=from:to:cc:subject:date:message-id; bh=qmv//PLMnUie9B7qaPX/qU2EmGiQx3aYNQaNo0ftsto=; b=W392SK/vElOUsNDyI6oHepG0UtGX6m0kYX6/Ow+4A6i7y0LVFCm1v+UBtAfyNJ9aXU DjP2f7Jg4CvPNJTx6RZL+hRzsqi9lvIOBjqkvqEqmF8+tqp7DEOZ5EDY0AUWkzl4ZLoP qqeAF9/nY+siFpQQcUQ9+H4PwygVUezWzgo212OOraDbStRhKECFfnV51wKzz/gpf5am V19kFvO8Rn4F7gtCw1otjZPiV5yXW5wyPzWYKD+V/yMKxHK1LMAHn/f3BAw4KnNluKp8 +lzv2mgJ50tJbCviVeOVdaaiZPAfb7zQ+SilPSVt2gW8COEko5S6x+hwbsFuIzJTsfzF syTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=qmv//PLMnUie9B7qaPX/qU2EmGiQx3aYNQaNo0ftsto=; b=GKKjrnnduf6ik5xXgXrY5OortO+rb3G+t9gF62m+6QMT+KRhO2izqqacHOkdGnDZkT rCueFrHzUkOCoc2LKG17rcBwxojtjBNOA2PRyPdtsq5Oqj3QBeD6o4ABYNEPPWlPiIe8 KMRRxytALekP851m+XVenLB8JWPvnyIZszwoOUr09+Aa1iPj6nP55f78besSsg/gvGvU njv84BZLjTWIWbIv3kFYlu1ick3DZnhaEIyZjbEzhVBRPdrkOzRlsb9oG8R8NitTDJ91 7EnJF9eZjh0lzSYuNqHU1JFHZoPQD6ZrwPaIhy2kJ7S+NB3eTz5KO5x3mb3h/ydQKpnJ db3w== X-Gm-Message-State: ANhLgQ1YcnBP0zh+yEC7NlHrFPJqKoC8ezj3RtDhSFc8AASvvrWyptNM OAVtXcGnGE5zXxEBTbHdflkEpw== X-Google-Smtp-Source: ADFU+vtdkDuYLw9tLxiNdRRm718gud7ooWVb+GAm8SnQTcSZTLUEJwlmx9EJniPmpYaDg+cSpfidqA== X-Received: by 2002:a05:620a:747:: with SMTP id i7mr5469399qki.375.1583263733297; Tue, 03 Mar 2020 11:28:53 -0800 (PST) Received: from qcai.nay.com (nat-pool-bos-t.redhat.com. [66.187.233.206]) by smtp.gmail.com with ESMTPSA id j7sm8872582qti.14.2020.03.03.11.28.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 03 Mar 2020 11:28:52 -0800 (PST) From: Qian Cai To: akpm@linux-foundation.org Cc: elver@google.com, catalin.marinas@arm.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qian Cai Subject: [PATCH -next 1/2] mm: disable KCSAN for kmemleak Date: Tue, 3 Mar 2020 14:28:35 -0500 Message-Id: <1583263716-25150-1-git-send-email-cai@lca.pw> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- mm/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/Makefile b/mm/Makefile index 946754cc66b6..6e263045f0c2 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -14,6 +14,7 @@ KCSAN_SANITIZE_slab_common.o := n KCSAN_SANITIZE_slab.o := n KCSAN_SANITIZE_slub.o := n KCSAN_SANITIZE_page_alloc.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 -- 1.8.3.1