From patchwork Fri Dec 11 18:46:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11969059 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 D34ACC433FE for ; Fri, 11 Dec 2020 18:48:45 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 136D723F37 for ; Fri, 11 Dec 2020 18:48:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 136D723F37 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-20594-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 9575 invoked by uid 550); 11 Dec 2020 18:47:12 -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 9471 invoked from network); 11 Dec 2020 18:47:11 -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=2x/zjVn7tqzzMwlgW94lOF/53GHge2qEfxVssZKSVKU=; b=sVh7pgdYPbhuziZ7RbVkNdr73qN77YcUUWXTQ1tAb3P7jqHRr2p1f5bPxlsX3TaJ0x NLRx4jH9CypSCESRGLRonyZ8+kkS3XNyERw+CW+BqWmKtawr0ILqseYbrw/qx5wrEH2B VqZ0x9qFDwfElGwb1vEdm1fnMLextKeSpBRqwLQXUche0e5kuofl1+h4UoBzhPS5Diu4 EguLuAaf07YUp6KSWi5vK+lTKN+85JJaMCLDLqfd6UvMg+GduXve9RFsPVLp74nssXU5 7G5z+jbgJYyIgkNTgNx96jpD1psInPt090dZnr/BEIQ4zT7bqAbfJUIq9iNE+/XzJIVu 6Ing== 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=2x/zjVn7tqzzMwlgW94lOF/53GHge2qEfxVssZKSVKU=; b=YIuEG7+IIzOXVezqGck9sBkcL2PmvMb44qto1+8I8a+MIyWrtvuIZLlvizUj0WK4Mg Xemv9+NPoRJCtDWwFlYVgNezthizOhR/kGnUn/z+gUY6twqTRre2TA3YeyaS5GyoLES1 UERNZMoN+pvGv1PI9kgZ8wIjId4NJRAW4+WZV4CbMmW3eM40QlfsSbgTDqitenSzLPSX ZYX72y0wWqAVOBFfz6tANBokrifMxAIYcNwBUCUZg9n6N9C5CY23SWW70fjVGmXNG8SH V/LzoGp306hGoZIjwg8nAgiwSgfhJnmxNH5j6bO582pp2ZmOsPpZJvxFWN9AX/qsCfJu apsw== X-Gm-Message-State: AOAM531lx/uxidBl+vfXGRzEHLueEQ0Pz6+fWeDVrBLc+6b6hocnlOmJ UVEGElU7DxmTRxXOapQ3SzmPRmScc/NVMETgDuw= X-Google-Smtp-Source: ABdhPJy6JuT0I8NnXRzTs2o4vn7H7iL4bg1V2c7l8tXurWBfldv/1YSed2IdWjWnqXB3B13fccdvqEaMosao7evXpYA= 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:a05:6214:a94:: with SMTP id ev20mr17352143qvb.56.1607712419531; Fri, 11 Dec 2020 10:46:59 -0800 (PST) Date: Fri, 11 Dec 2020 10:46:29 -0800 In-Reply-To: <20201211184633.3213045-1-samitolvanen@google.com> Message-Id: <20201211184633.3213045-13-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 12/16] efi/libstub: disable LTO 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, 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 8a94388e38b3..c23466e05e60 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -38,6 +38,8 @@ 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.