From patchwork Fri Dec 11 18:46:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11969057 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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 13C56C4167B for ; Fri, 11 Dec 2020 18:48:36 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 42F0C23F37 for ; Fri, 11 Dec 2020 18:48:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 42F0C23F37 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-20593-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 9378 invoked by uid 550); 11 Dec 2020 18:47:10 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 9287 invoked from network); 11 Dec 2020 18:47:09 -0000 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=sUICI29mkgxH8XDf6qhMCrhn46+Hzc1owynREvsajYA=; b=Mt5+qfjfZ+VylSyluHh2VZfop+oBL3rJXxZDwRaX22l0TfpVmfjZWdRRf4EjcTdwNZ tI2smkjeD1V9WDfLcVGcM0q3lBKc5wUlQ0PV2xNazny/qeDxBgjfBw3M6ZeazZiiVTRk PuilV1bsANPSfYl5rf4CFzgLv9TH7xZEN6ZdlxzmXfi8iZ0NN8yPkHKEhjrDZeO93M3Z Is2ezXs/oAG91woA/WjRTGjceaiPw8zQ6gbt9xphaeSWeIK5J0CKds3mJv3qxGB+SGOL yPRehVrtvjhUpPjpNJk+E+PHpWf8LAXA2fOr5tqj7a6NYji5/SC+3IO85wAjvRUlfz9n 9oSw== 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=sUICI29mkgxH8XDf6qhMCrhn46+Hzc1owynREvsajYA=; b=Qoheqv8qnj1xltfDlSs4S4LH9t2SWtDhg5U8P2NvcEEFmY7T2q/hbbK+V5afSY00+n Ibc1Cj7Nomjn/irJbi91eZd5Jem3Fef8eVCMZCDRUQ86V6SgccwZsKfBrJNnkKRMVaJD 6rrd0Sf6P+dvWC+6Utc8IeKCF6s3VZp3nis8kUE8juvQS07/YE0dwLirVZkKd1zNsDtj CnoOzXRMD0m4hBW9kgMOWwXjxpmvwdOD2nuyqAppp30aR/sNtdhSow226qwfPDB05838 u+63e5ORtC9KDPUFISG8IFl2xVHNh/m7dEwuZ338T11x5ydqI1hgODXQCKKd8t6Yn8L+ id6g== X-Gm-Message-State: AOAM533QzARzd+FRJNHaSxYSUbzkNChfQF9Cr09769+r5U9FO/uCO+Fi u4v69F9XJDgbIRpx/ejE/QAw3jLSQypMFQ/DAHg= X-Google-Smtp-Source: ABdhPJyLTnaXTvQFzdGZbemjJUsFLRdMqMxsuXqAqm5rCyQnrHrKDgTVs/Qim5syv8mGMDSyRXsRkeSRJzrM/1+uvUc= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a17:902:8343:b029:da:cf6a:f65c with SMTP id z3-20020a1709028343b02900dacf6af65cmr12048006pln.5.1607712417071; Fri, 11 Dec 2020 10:46:57 -0800 (PST) Date: Fri, 11 Dec 2020 10:46:28 -0800 In-Reply-To: <20201211184633.3213045-1-samitolvanen@google.com> Message-Id: <20201211184633.3213045-12-samitolvanen@google.com> Mime-Version: 1.0 References: <20201211184633.3213045-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v9 11/16] scripts/mod: disable LTO for empty.c From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , Peter Zijlstra , 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, Sami Tolvanen With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object files. As empty.o is used for probing target properties, disable LTO for it to produce an object file instead. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- scripts/mod/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile index 78071681d924..c9e38ad937fd 100644 --- a/scripts/mod/Makefile +++ b/scripts/mod/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 OBJECT_FILES_NON_STANDARD := y +CFLAGS_REMOVE_empty.o += $(CC_FLAGS_LTO) hostprogs-always-y += modpost mk_elfconfig always-y += empty.o