From patchwork Tue Oct 13 00:31:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11834609 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 87D9114D5 for ; Tue, 13 Oct 2020 00:35:22 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id D896D206B5 for ; Tue, 13 Oct 2020 00:35:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="kWr9Y/fq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D896D206B5 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-20193-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 19768 invoked by uid 550); 13 Oct 2020 00:33:03 -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 19619 invoked from network); 13 Oct 2020 00:33:02 -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=IWlwO4V8zfIKj2VoQVJSOpIzEd6XIOwNzizfhzYsm+I=; b=kWr9Y/fqtR1gjXlZbCdcFUO5y9KCbBO6doGSE6eV/R4SdmCC/fG0VIYwLLj+OKBwVo t88hxunzWeAhsqD6nX4pMH3NXEN3LQTEHYiul8l16k+sa2iBaYnnGR+mH9hNA4iikAmL fqVb25yRhuLsNSg7v5YJjN/fVyXPqCbeWKnvoXYnl9WCtRWuKoabyI01wNyG9w6/b7UM 4pHEaQubfMyOEQT05Qht8Nh3XzDQC3RyvotMkxtCaBQJVlkntTJDfU68nv0YNejU3LJ8 DLC87sAOS1Egq4SGIijIlfkUP3DDU2E/gTaUdoloBdFbRBoomS8YvmW0JUlEF9bGUTbb DK5w== 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=IWlwO4V8zfIKj2VoQVJSOpIzEd6XIOwNzizfhzYsm+I=; b=fSo2Zkr0NrRJk77R6X+utq27CK50Lkrhq4NhVqedP5ahHg1BO9bcK10+Hyd3GvScXH 6DgZDgCxW4eDVeojMXo1dB4iNgq5knJuz6Sa4K6oGUxhx/u/Q1keHvFxdBHRIjq82VhT y3jQmSm5gVyx6cKdKjcBfmaHYZEmBFw8RW6V5nKGS3pXlGYVR9pKC3ViTRHSpu8+pizE vXEOBUHB3HQ3yFSp1QYouNTHZjsfpN4xTWWi4uQ3Zhpvu0xvo3pdaTfn9myhRxjKjqgU sOphbGCr+ZaodVaG5sON7l0n9twcGNzlozvC9N/GVMGKxpYdW+/OLUiBFgq7Dg8dNFp4 8ggA== X-Gm-Message-State: AOAM530NLJFpq2MfjBRaPEny5H18LuytF18RNB7fz5vVua1g2Progs+m SBlyFTiBm7HoztRQmyczKE3HA/wzlzSvI2DHhYQ= X-Google-Smtp-Source: ABdhPJxmlU/A1sroaipRnUbPqUCXYyj5EeYMFDk9TnoZTSUFb4GItjuig8hO655sUorVd0VW8HG+pUfRKD2TGlP3Uv4= 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:ad4:4f46:: with SMTP id eu6mr28230471qvb.9.1602549170292; Mon, 12 Oct 2020 17:32:50 -0700 (PDT) Date: Mon, 12 Oct 2020 17:31:58 -0700 In-Reply-To: <20201013003203.4168817-1-samitolvanen@google.com> Message-Id: <20201013003203.4168817-21-samitolvanen@google.com> Mime-Version: 1.0 References: <20201013003203.4168817-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v6 20/25] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt Cc: Will Deacon , 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, we produce LLVM bitcode instead of ELF object files. Since LTO is not really needed here and the Makefile assumes we produce an object file, disable LTO for libstub. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- drivers/firmware/efi/libstub/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 0c911e391d75..e927876f3a05 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -36,6 +36,8 @@ KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \ # remove SCS flags from all objects in this directory KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) +# disable LTO +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS)) GCOV_PROFILE := n # Sanitizer runtimes are unavailable and cannot be linked here.