From patchwork Fri Oct 9 16:13:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11826649 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 17165139F for ; Fri, 9 Oct 2020 16:17:47 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 5EF5C2222F for ; Fri, 9 Oct 2020 16:17:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="icGF2o4B" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5EF5C2222F 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-20151-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 7734 invoked by uid 550); 9 Oct 2020 16:14:33 -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 7637 invoked from network); 9 Oct 2020 16:14:32 -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=icGF2o4BoUC5H7jDfDcqIeIDmztt1DX3EBV4AR9CIZel1UdghtV62q3fzjA81E5ME4 x9g3yQfuIaLSgx21c6ABnIjUmaI4VqxjY4B5WnUXRoUb92nAtC/XbQPpxdBRAKJqH+qH jcvBMX8XEpz4rNBFWhnnnRs6RxEEg7NtFbXbUMhmEcBsm9ep+5oJx3BqoMUfqRJe9eh+ HQV2rljyVTcunwoXwynW5GLctChORkFUDmM1/j1sk+6+WxF8Dg5/LcVdGd37dGhF+GtO M9aoDBKTtmJg2M/huHN2yYE2hfJUvsC+WO6y4SzBmnETs4aTNvX9A0N+1ApFOCsrkyFd VCjQ== 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=IIGyOtMxtDkI8DiMRIPfPO9glidGlnzYOpR9ji33FcF6P5n6gsEeS3ETS/+M8hBxJA P3nignFWPtItAfddKJFxIHYlgrqi18dOT7CU4LkinIcMKam9IlDidynPgIVFZZWPHkHW Aq8PvJizwaU5DxXHP0w3qScorhi/TtJ1ij3RHZMZ7vTsiDGZvJu24cgG952HHaseXQnX //y+1DJpsfAdUj7rK7MnO5fvUWpBaNOK53XgoMMIlztOQOgrOTdxHL0SS1wSrJtExkah rytPFHTCveCxETSZFNlVf/4nJ8xvhLBYcb3NgRBbElWclm4c0j19UunTn2uXxuCyjwbB KtTg== X-Gm-Message-State: AOAM532fm67+ApXFxlmyyoXNR8sfEMTgRvTu4Ssl/oICUXgY3L65g/Jh 1PPD83+7L3jHynCQGKGgYul5Tkn+N2mq8/iS7WI= X-Google-Smtp-Source: ABdhPJxEWHAvyNkdIDlQRKJ2smQRYfbTU12bNHGd7NqYEmxH7inHJ1sIHSNvQnTIBhdfm/bIQe6W23Fz9FB7iOfrFU0= 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:ad4:43e5:: with SMTP id f5mr13905635qvu.12.1602260060762; Fri, 09 Oct 2020 09:14:20 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:29 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-21-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 20/29] 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 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.