From patchwork Thu Sep 3 20:30:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11754845 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 97BFC746 for ; Thu, 3 Sep 2020 20:35:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7DBDE20722 for ; Thu, 3 Sep 2020 20:35:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="ufRzOZtY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729569AbgICUfB (ORCPT ); Thu, 3 Sep 2020 16:35:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729566AbgICUcx (ORCPT ); Thu, 3 Sep 2020 16:32:53 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CF10C06123D for ; Thu, 3 Sep 2020 13:31:39 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id c78so4032923ybf.6 for ; Thu, 03 Sep 2020 13:31:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=3q7TZ5J5xqKWdUS4X8SiQHdlDi3K3u69bSPkIoNlqR8=; b=ufRzOZtYYauSzvxZUBKz1JVbuUwKqmAJdSrdtsdAtyClxzQSdbUMjMfIMupNHjnLGB WO4ZqGFWI4GoHdfXhHBAF+P/jv072mNJPl0sQzhOhWjmxcDeq8t/wGGp/8OanND4USfj LhikjLiJG9jAk0+cvkHoOwClvc4d+s/6mEvmHU+7r2wfgvpCQERcCjQH7zsDH2517Ogk GD3ZV/LG3aSx/OdpXy0Szz6VTm1uw47NfsFGVYKWXK4IlQH2y+9jyGDbrxKpkAqRVQ6l TgM50rxrgjBcqFMaRVrmvkVprT/6WaCjwoJLbBtb5rXpbpl2VQ2HuV9qu5Jf7aVs2fRs o+ow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=3q7TZ5J5xqKWdUS4X8SiQHdlDi3K3u69bSPkIoNlqR8=; b=gh1iK2gpiMtbjGaxgTuzpjQB/mF5cHry7XwhQTmYPwVqQuIPj6RVQF8rXZ0UpLI6fu Wvi+9a/Aq5HX6ulMlYS+cEqYPQ1JwAAnDN8Xc+5VIlTCgA9K1yTlF9cekckMKmUEWfbs IO+ys/jjxADx8d3pZ9lTHJ3Bxcenk+mwlfIaocHG8QC55yKBty3X1/GVbGfIB7NIIBhh wxEYYlZ1/Ypv09euVRSNVCRYRt17C3/+RFgfSEe78gTneku+9qAD4rN7ZWot2nCNL1v2 5iF+GtnwBdIa3VaDRx94K7tShf5red8EwKXDNpYbonMgiNz1ALxIuo/s3wsjOpJJ2dqU Goag== X-Gm-Message-State: AOAM532nrkcWdPZj+fqY7tPe9oaJMzoFMgbFIRJzyPmcSr13Wh1ZCHpg 7/4ndr9UPjTJgWkYycbyuyYlpzMGIKJUzQOwXts= X-Google-Smtp-Source: ABdhPJzSHh4NCUcdQaWfXuHL4xXV+3Gzu7YAUpxYnKR7xzXHL7k1OIFuYPArBmNIqbbqiPyK+SQbqhBjAf2rbEmrgrI= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a25:6555:: with SMTP id z82mr6003281ybb.472.1599165098726; Thu, 03 Sep 2020 13:31:38 -0700 (PDT) Date: Thu, 3 Sep 2020 13:30:46 -0700 In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com> Message-Id: <20200903203053.3411268-22-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.526.ge36021eeef-goog Subject: [PATCH v2 21/28] drivers/misc/lkdtm: disable LTO for rodata.o From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Peter Zijlstra , Steven Rostedt , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org, Sami Tolvanen Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Disable LTO for rodata.o to allow objcopy to be used to manipulate sections. Signed-off-by: Sami Tolvanen Acked-by: Kees Cook --- drivers/misc/lkdtm/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile index c70b3822013f..dd4c936d4d73 100644 --- a/drivers/misc/lkdtm/Makefile +++ b/drivers/misc/lkdtm/Makefile @@ -13,6 +13,7 @@ lkdtm-$(CONFIG_LKDTM) += cfi.o KASAN_SANITIZE_stackleak.o := n KCOV_INSTRUMENT_rodata.o := n +CFLAGS_REMOVE_rodata.o += $(CC_FLAGS_LTO) OBJCOPYFLAGS := OBJCOPYFLAGS_rodata_objcopy.o := \