From patchwork Wed Jun 24 20:31:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11624277 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 9201C60D for ; Wed, 24 Jun 2020 20:35:09 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id EDB5D206C0 for ; Wed, 24 Jun 2020 20:35:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="QHLFKZjz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDB5D206C0 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-19122-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 1432 invoked by uid 550); 24 Jun 2020 20:33:35 -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 1350 invoked from network); 24 Jun 2020 20:33:35 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=063/REsTpnFRr+cDI+sseVhgFckW5SG29uiho3UNZTY=; b=QHLFKZjziQv1B4lTQJOFrFkeBBeD3vqMRAW+KU8uSJ0z8P5diTku752ppGYK+p1sHj Tuqj5FmieFc5zewP3DRNS5iM40Pga5Yd012RZ1UJSub9OeGcQ/BjM9Xhswo2S+wawZKA RoZrP4AKzJhPxHnp2kwUEq2iAcWJC9Jvd0o41DT/D0J5C0PT78vt0tH2KpFNFHvjKqOE izzBiEOpzdtuThxfwOEyO+K5m3BsSaqVWi7OpscZsOWnWe/8qa7rh4O22Mfte1SMk6Qe rW+Cnirb92ArG8+1lDPtjHVyv4CvsFhD6/kzdDW605IdVtQymCiQD3WRRYOvRlD/Mv+p 36IQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=063/REsTpnFRr+cDI+sseVhgFckW5SG29uiho3UNZTY=; b=KUzoSMwCBNyusqRNjKfFXjbh7fzzKBr4SV1jxR+GSkGiH1QL/H8MYg4y8U6EPmtGnG Mcv6ceEz5hVtqEe/C+Zo5Fu/G8P7e/n9fVQjHD5y6YYJM0cfAYy+2lNuo6U8uGddx0vt LiqZEHEdC1ZM5lOLsGIVqOE51/BG9GcM2KJu6CGA+rKqPk6TfEwyJOO9Aj+1e+DH6n7q jdHeQmILXJZ1zQez3AbCPjiI5U6B3jSuvPZ8HE9D1LXrLMsz5VPrTzLZfefJp4yrqPH/ b5vLpIMui4MMWg+5KTufHOyFl25Kv0hmJvhDDbrEiwjjAHK7SlKOgtcMg1mKMUFIyZQ6 0XCQ== X-Gm-Message-State: AOAM5335/Y9hmZ7yOvHvntPK9X+d32hfBbjdTcg7reWMp3gpsPGIrwlh EQbIDGPqd/pVueDxjXFypXX7IjF0pDdW3bRQnns= X-Google-Smtp-Source: ABdhPJxSD93X1bZbMxIVxbatDlNzo+plulwlXrP7mUhDGUyc2zpYsUnUjocqKRL/aFZ9kJnCfhHJEfDbrbY1YJULi70= X-Received: by 2002:a25:e8b:: with SMTP id 133mr46457083ybo.13.1593030803250; Wed, 24 Jun 2020 13:33:23 -0700 (PDT) Date: Wed, 24 Jun 2020 13:31:52 -0700 In-Reply-To: <20200624203200.78870-1-samitolvanen@google.com> Message-Id: <20200624203200.78870-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> X-Mailer: git-send-email 2.27.0.212.ge8ba1cc988-goog Subject: [PATCH 14/22] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: 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 --- 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 75daaf20374e..95e12002cc7c 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.