From patchwork Fri Sep 18 20:14:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11786185 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 E129692C for ; Fri, 18 Sep 2020 20:18:16 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 3084320684 for ; Fri, 18 Sep 2020 20:18:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="m59NkH3j" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3084320684 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-19937-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 22250 invoked by uid 550); 18 Sep 2020 20:15:42 -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: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 22139 invoked from network); 18 Sep 2020 20:15:41 -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=6wkvNORTwM39S5uL0TTc53qeLnDmqjDSKMDvKwEqUnA=; b=m59NkH3jdBVGi3dXc89rIxXW0NE7GMfjZfL5ODM7hicbW9tRbSExno6sIVoWVPk/b2 6ew8lrdf0hw7stNFVAv/okktVg/LjpO4I7jNzt6a8VoaOl/pRpNH1xks4v9BW7bxD/Sr i6vq8H7yjf2sd8Aini4O9MK38tgJzNMOIkbJl3sG/G/kVyi9tS3kdWyXupCYVuHY/tg6 KLw2X/vONosgXWGz3RGoeu4MpReDPfkBwBqpqDUmYFeEC91faan+J54tUJcmpgPMtnOY BvbaH2KVwWvnm9Y2AQvGn+V2h5meg1oOgj2ERRg9cb5ebYhX4XX5VX8BZKgVsjjWQeQu IcZQ== 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=6wkvNORTwM39S5uL0TTc53qeLnDmqjDSKMDvKwEqUnA=; b=GKYsi9NCkJ2HG6+CBrMQJ64lurUaXirliAHzOHMOAC7ksA3hZgq8MRQhVrojAtkF7d uliBD1Fb0ik2ClfFJJyg862IQ+eTgz/wBuWN0Tzrap+KT4KuWOhoScMnwJ1xc/xq96Tj Jp6f/qOBTwZuroH/QaoasyBC8FFsNv3DAOVizyRSn5juaUu6cd4vCLc5S75N31uxpS3B LaeI8lsm3Xde12h0sLD5FEqNUgCfGI76rBD+8f2930Tqrc20PVcDguP3Pl/vx3arw2kM PlyGCgS1sbaEzQfMpFh53zR4ERRINCfiGa991PicdN0eyVijUZnGhO0D/Xx8lUIk3gKB yIuQ== X-Gm-Message-State: AOAM530KJ2eU4PK3rgToRh9JTJbqgQIU395+6shLT41r92p7QV8fhddH dD8u3wacWT/DDjjO63i+VsXalvI3Qx65RkwvBSs= X-Google-Smtp-Source: ABdhPJyhl0O3HrtpwK2+/eq92loT21+CwrJm1w5RAc9ZKC6o0au3sfzPs9arIL72JQf6OFaC7oO4rGV/iT2i5XrFZMM= 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:ad4:57cc:: with SMTP id y12mr19090228qvx.48.1600460129171; Fri, 18 Sep 2020 13:15:29 -0700 (PDT) Date: Fri, 18 Sep 2020 13:14:27 -0700 In-Reply-To: <20200918201436.2932360-1-samitolvanen@google.com> Message-Id: <20200918201436.2932360-22-samitolvanen@google.com> Mime-Version: 1.0 References: <20200918201436.2932360-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog Subject: [PATCH v3 21/30] scripts/mod: disable LTO for empty.c 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 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