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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D94DC433F5 for ; Tue, 29 Mar 2022 12:45:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236546AbiC2MrB (ORCPT ); Tue, 29 Mar 2022 08:47:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236676AbiC2MpX (ORCPT ); Tue, 29 Mar 2022 08:45:23 -0400 Received: from mail-ed1-x54a.google.com (mail-ed1-x54a.google.com [IPv6:2a00:1450:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8570723D5BD for ; Tue, 29 Mar 2022 05:41:54 -0700 (PDT) Received: by mail-ed1-x54a.google.com with SMTP id n4-20020a5099c4000000b00418ed58d92fso10976939edb.0 for ; Tue, 29 Mar 2022 05:41:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=enpw47tW5AlKxiO7mK8zQaDRtxatFy2+pOtakd8BlZk=; b=mCwjmjg5IEjrVFruDI8qNciYEOnA2jiLkX9pLqN6BnRcekJoE0XFuHwS9ksz9BZuKY n2Vq+3ICaYrPhLsEY2JcrP3sAWEO8412GRb/cLfojFWc/Jv/zfHf6VmhfoHQDyibrhRx 8IC9UaRnp3e1xpCjw97idSW8aarWoqZh0n2KfPjUQhED20Y5dJyYXlGP9d7TDcAtLJjJ tGVXH5XRlRg71IARaSa3IaKomYbSYugJMCjnDyryrStOIVf7B/EHB5TBnzADPTie1FVi apknmdO2z63KmAh6CYf0AHjMa0AeJ4eU4IOL9/Ql/UgZ21OFy1M4gXnTW1xPdquE8NbE svEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=enpw47tW5AlKxiO7mK8zQaDRtxatFy2+pOtakd8BlZk=; b=uEq5vQ9eqLls1Peoy6mU6QTJCaCxUhAtqr2bTA9gJcheKY0MiVdgK41ER33qHBbfaM Tr7m8y032sFkiqjIv49ZdoTsvx2JDr6IJFu0cNKGSgRMT0iSYiqkxDgcVNSl/ASHUvyo Oz6MSEwGkaTbEorNGpXqaYHgl/LyL+UqOSpmYwKf2kO0Y2fe59S2MSUYf3xBi9nrVZxX njbmXzNloAamCncez8gjKSO+VsPFms/KloNA2QzUAI/jIXaS+h3ODjfrEmJsTjMqLddT pHDP0GmEwJuvOxh6MDg8FDHvsEnNwc+MMYN+GzaGcG0Geci3OT8HyXqf48+kdfFWCH2T jQrQ== X-Gm-Message-State: AOAM532mzryqOeoaY+LRV+VInajssKOJuau9qYY7UWwNkW2aMQ4Um313 hTnBRBtfiBij0MOCPJGy0zuWLnFbHvw= X-Google-Smtp-Source: ABdhPJyvopsmMnmkArFS+YVZS01vYvUWgOoKNLhFelQAgUTgMKFm4yxx2n/LM5t8wnbOjIRaXG8/wiLoWwo= X-Received: from glider.muc.corp.google.com ([2a00:79e0:15:13:36eb:759:798f:98c3]) (user=glider job=sendgmr) by 2002:a17:907:6297:b0:6da:6388:dc58 with SMTP id nd23-20020a170907629700b006da6388dc58mr35414945ejc.472.1648557712510; Tue, 29 Mar 2022 05:41:52 -0700 (PDT) Date: Tue, 29 Mar 2022 14:40:00 +0200 In-Reply-To: <20220329124017.737571-1-glider@google.com> Message-Id: <20220329124017.737571-32-glider@google.com> Mime-Version: 1.0 References: <20220329124017.737571-1-glider@google.com> X-Mailer: git-send-email 2.35.1.1021.g381101b075-goog Subject: [PATCH v2 31/48] kernel: kmsan: don't instrument stacktrace.c From: Alexander Potapenko To: glider@google.com Cc: Alexander Viro , Andrew Morton , Andrey Konovalov , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Christoph Hellwig , Christoph Lameter , David Rientjes , Dmitry Vyukov , Eric Dumazet , Greg Kroah-Hartman , Herbert Xu , Ilya Leoshkevich , Ingo Molnar , Jens Axboe , Joonsoo Kim , Kees Cook , Marco Elver , Mark Rutland , Matthew Wilcox , "Michael S. Tsirkin" , Pekka Enberg , Peter Zijlstra , Petr Mladek , Steven Rostedt , Thomas Gleixner , Vasily Gorbik , Vegard Nossum , Vlastimil Babka , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org When unwinding stack traces, the kernel may pick uninitialized data from the stack. To avoid false reports on that data, we do not instrument stacktrace.c Signed-off-by: Alexander Potapenko --- Link: https://linux-review.googlesource.com/id/Iadb72036ff6868b1d7c9f1ed6630a66be6c57a42 --- kernel/Makefile | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/Makefile b/kernel/Makefile index 80f6cfb60c020..1147f0bd6e022 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -40,6 +40,11 @@ KASAN_SANITIZE_kcov.o := n KCSAN_SANITIZE_kcov.o := n UBSAN_SANITIZE_kcov.o := n KMSAN_SANITIZE_kcov.o := n + +# Code in stactrace.c may branch on random values taken from the stack. +# Prevent KMSAN false positives by not instrumenting this file. +KMSAN_SANITIZE_stacktrace.o := n + CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack) -fno-stack-protector # Don't instrument error handlers -- 2.35.1.1021.g381101b075-goog