From patchwork Tue Sep 29 21:46:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11807189 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 6C016618 for ; Tue, 29 Sep 2020 21:50:04 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id B89BA20774 for ; Tue, 29 Sep 2020 21:50:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="gdAEDDvL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B89BA20774 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-20051-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 1453 invoked by uid 550); 29 Sep 2020 21:47:34 -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 1331 invoked from network); 29 Sep 2020 21:47:33 -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=M/tCJ87SKQnbyhBQptnFDCNgoy9D1scy1+3ph9ahS3g=; b=gdAEDDvLlL0msAdcbIE0elhCADhQmKL9S16dzNU1NewfqdOooSY9iFqACy8+PZ7gHu RjJqXHtJjRJu9BoQC0Z+qcoslnaCbYOM5YVwAUiEbJv8oMPbNKei4NbKX8/eYf1TjsBX LuD//MCUmK3U7ZJ2uod6D1w8OHvoyhKJylEziLAmUyzobSpYb93PY4CL1x+jJuLiN+Df TJvELp9Gtnh21l2Y6CWFhRqKGqHS7xc78jprEFcrRoojdnbVtKont9eEkY55sgaj+pEf r+rlpDV8ZtQQ3iUVmb9timiu1KOz8XTe/0fr94WEPlFW4uof3ENuM7MDtO9p1BgJUAsl mKLg== 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=M/tCJ87SKQnbyhBQptnFDCNgoy9D1scy1+3ph9ahS3g=; b=Y05ASAn/JY5wAAQlxJlDarVu1UcaNmgAxeZT6pbHEL0EG65/hJ/M2ZIA3AlPBJsmeQ 4t2Qf7n4dyPNjQWLSDqaOzaTwdPNOO5BxbymXtDw4X+nEdurrbpFwKMmeDisMqdnyTny eQtNIbEgtgKdvkh5SZnu340mgCRbZzbscU3DLd7kmgc764jSpI6MPQPf3KXUQsiLA0FD KQRdJUdN9M6h1Otl4SB1CU41A1bhkhwffiwDyz6U19WfFFrn2ySMtEmd9+O2Y5XfqAB/ Ay049Xi8BwdrfDjQrMnjknI/RWUEdQRMsEP5JBd7a4xviKYhvIcAn/lsIBPxKk3sHMtf Wu/A== X-Gm-Message-State: AOAM532uYJLJpKpyW923v8R/XeozNyFGxNEPmGABaEaPmmA1zZ/uQPLZ d505sDMJPGWlVYzO//ko36WFKztdiWhdUgjl6Ls= X-Google-Smtp-Source: ABdhPJwIclf1YZILYpRHL9aLGjIyClVObMTVmWZ7pfwr9sU8b01qvKeenw3eQ8lUfzBJlACcTh5VbLCas1CqVTaKm1c= 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:ad4:58c7:: with SMTP id dh7mr6716936qvb.20.1601416041280; Tue, 29 Sep 2020 14:47:21 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:23 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-22-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 21/29] scripts/mod: disable LTO for empty.c From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: 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, 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