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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 5BB0DC433E2 for ; Wed, 2 Sep 2020 08:55:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 35D0D2078B for ; Wed, 2 Sep 2020 08:55:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599036922; bh=5z1uEqG+wAJQOlCy6iqhMsGNezM4SD/VS2ml/uiU0Wc=; h=From:To:Cc:Subject:Date:List-ID:From; b=N0W1Tot5p2PdZYDe8gG187xFrJP9hFVz2wNnjCXBgOeddoVf01SVHN7oEcSAb5wLq myBxTkFkk0pj7Kqsa4Kb0yJKSPAQUEyNmtAKAxrn9ncu34rH8vHy5+jQcMUBnGLf64 cIVJa2wpCfoDc5mvO3fkjsD4Q6S/omNoQgVfcpPg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726293AbgIBIzU (ORCPT ); Wed, 2 Sep 2020 04:55:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:34724 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726124AbgIBIzT (ORCPT ); Wed, 2 Sep 2020 04:55:19 -0400 Received: from localhost (unknown [213.57.247.131]) (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 B990C2078B; Wed, 2 Sep 2020 08:55:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599036919; bh=5z1uEqG+wAJQOlCy6iqhMsGNezM4SD/VS2ml/uiU0Wc=; h=From:To:Cc:Subject:Date:From; b=D/qaUEbxQYa3Ppmk1WKX9leVTZXUqog3yaeX24dlLIejCvt94c1SPPzlhG8UYsxLx mpu+1bjNMaet0+xS+C6NMTCkz24fL1MQBlwj6w/BOSdHOkURerTP7HJZZ0CDTLhUut +2MH1qPxqQ84SHw0uKssUBkHKzdiAejGPrYOwj3s= From: Leon Romanovsky To: Linus Torvalds , Peter Oberparleiter Cc: Leon Romanovsky , linux-kernel@vger.kernel.org, Colin Ian King , Andrew Morton Subject: [PATCH -rc 0/4] Protect from GCC garbage input in GCOV Date: Wed, 2 Sep 2020 11:55:09 +0300 Message-Id: <20200902085513.748149-1-leon@kernel.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Leon Romanovsky Hi Linus, Both Colin in Ubuntu [1] and I in FC 32 are having same kernel crashes while GCOV is enabled. The reason to it that n_fuction variable that should be provided by GCC is not initialized (or wrongly set). This patch is based on the RFC [2] which I sent to gather feedback, but didn't get any response, so sending it to you in proper -rc format. Bottom line, GCOV is broken on GCC 10.2. Thanks [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288 [2] https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@kernel.org Leon Romanovsky (4): gcov: Open-code kmemdup() to work correctly with kernel and user space pointers gcov: Use proper duplication routine for const pointer gcov: Protect from uninitialized number of functions provided by GCC 10.2 gcov: Don't print out-of-memory print for all failed files kernel/gcov/fs.c | 5 +++-- kernel/gcov/gcc_4_7.c | 17 +++++++++-------- 2 files changed, 12 insertions(+), 10 deletions(-) -- 2.26.2