From patchwork Tue Sep 29 21:46:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11807193 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 77D1F139F for ; Tue, 29 Sep 2020 21:50:13 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id BC1DE20774 for ; Tue, 29 Sep 2020 21:50:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BzhS1T0x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BC1DE20774 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-20052-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 1655 invoked by uid 550); 29 Sep 2020 21:47:36 -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 1566 invoked from network); 29 Sep 2020 21:47:35 -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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=BzhS1T0xYeEiySZIOFWUBMfKhfKV0HPZIieZxlx9n3aL+z4pvUMG5Ng4jF9unkKap/ tO9mqZLwYCHnW4SoQoRDd9xj/JuUj2YsNmmiE2W6UZ9Itp3mKe8kS3gKBADOR/nGL3He otJNs3Mijsx+Zkiokc4jCGwVgbgADg7TCEk8/IVeBXOhMnE5Hczz4ADi7wiEyV9XxDnQ CBCO0JHTOoIbLsAtW5aT9bGD3uO2HiLFrmGsIOQJmaWMfyDYVuHD5zcosXBXFN0QKfe6 OUelHGKeWMSnmfva0aiqsCtg7FoCJjy5OfR9BBUjYTviAyQA6MbK83k+CKxB+opxcmzD 8gIg== 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=SMR2/Zr7m9btCDRB/0Z/w2MTVhq/37ih+00xVpNqJoE=; b=lGDmpEyWSJQ5G1KPYrgUHXs3o9URzpITTAMHKnTMpiT0Si7YSyA1N8FC9lUfGQjfRi GFTi9oHhcbjPiBwW3p0kFIegekB0r4HPRDoolTgRCfIgJomSnGJcQQ/z16aPEjKLsOoK pdVhvwZFIFdlq5LnFuKqr6FlmXpgJW9f9nBfwHLviLdIgCUAg61wOvHpfmQgbwLZpQqG BSXF3pPoD4T4o4ikEYipnQMsX5Q0Q+r9iSrZEh9TcKvFHzK8wxCQcXz/fXCNOlLwIxle TtadZkAcwW3WOU2jiH9gpAptXMvL1bUo8531CYW+98x0iDi1nDynwCD1jLhLMT6Ca0dK SqNw== X-Gm-Message-State: AOAM533Br/vDdJja5bgkDaS1HJd0vgboG6Ee6rsrlYn3sUJLE4bEej68 pX3lapjTSuVlJwETzhYXbuIypef4RwMCsEbKssY= X-Google-Smtp-Source: ABdhPJxBMrynxyAmEuZVv9LuIz06tIes1P0/ZQj3AQWscVUvE2zt/WDYQVICvMnTs++j9WIGBb/QMCUTkCn1lpeTKkM= 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:a0c:9a4b:: with SMTP id q11mr6580741qvd.29.1601416043698; Tue, 29 Sep 2020 14:47:23 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:24 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-23-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 22/29] efi/libstub: disable LTO 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, 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 296b18fbd7a2..0ea5aa52c7fa 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -35,6 +35,8 @@ 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.