From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 E58D6C352A3 for ; Mon, 10 Feb 2020 16:44:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0A1820863 for ; Mon, 10 Feb 2020 16:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581353088; bh=N8yq2QheeIQsMuSfVUwgC4v4zDfKO0EfsxrtfIRuif4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=whgUpdMTcmpgtYD0NlarrDSqjS/3AFoqPs37UHVHqMa1OGLJRIrhFdwW6/IhPUF8b 2V5LXU8vJYO8u7q0uMAK5wvol7xAPnPM7/pLVQirmpKWh+knlAOTprgrG5MzLKmYZW 5vM+bWV2HZhAltppdHMfqUfPtMbabOnC5OgyTHy4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727641AbgBJQos (ORCPT ); Mon, 10 Feb 2020 11:44:48 -0500 Received: from mail.kernel.org ([198.145.29.99]:39524 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726896AbgBJQor (ORCPT ); Mon, 10 Feb 2020 11:44:47 -0500 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1346120733; Mon, 10 Feb 2020 16:44:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581353087; bh=N8yq2QheeIQsMuSfVUwgC4v4zDfKO0EfsxrtfIRuif4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=2VwzkEdpM+ZMnhTLMJYcU9N3jiiHVKzdt/a8hF/PCj1fXdjLM5sFDHMXpzaDNZC5v rX1pFDXRVL2huOr1q9AxbDro7JOJTMPmLrqO9yHDSnnqfpwUUIBJGDEnezY64skR+M BIMtEnTzgYJ9mRVtp/4/HnR7TwXJiZDAKuqYFC68= Date: Mon, 10 Feb 2020 16:44:41 +0000 From: Will Deacon To: Sami Tolvanen Cc: Catalin Marinas , Steven Rostedt , Masami Hiramatsu , Ard Biesheuvel , Mark Rutland , james.morse@arm.com, Dave Martin , Kees Cook , Laura Abbott , Marc Zyngier , Nick Desaulniers , Jann Horn , Miguel Ojeda , Masahiro Yamada , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 09/11] arm64: disable SCS for hypervisor code Message-ID: <20200210164440.GC21900@willie-the-truck> References: <20191018161033.261971-1-samitolvanen@google.com> <20200128184934.77625-1-samitolvanen@google.com> <20200128184934.77625-10-samitolvanen@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200128184934.77625-10-samitolvanen@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 28, 2020 at 10:49:32AM -0800, Sami Tolvanen wrote: > Filter out CC_FLAGS_SCS and -ffixed-x18 for code that runs at a > different exception level. > > Suggested-by: Steven Rostedt (VMware) > Signed-off-by: Sami Tolvanen > Reviewed-by: Kees Cook > Reviewed-by: Mark Rutland > --- > arch/arm64/kvm/hyp/Makefile | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile > index ea710f674cb6..5843adef9ef6 100644 > --- a/arch/arm64/kvm/hyp/Makefile > +++ b/arch/arm64/kvm/hyp/Makefile > @@ -28,3 +28,6 @@ GCOV_PROFILE := n > KASAN_SANITIZE := n > UBSAN_SANITIZE := n > KCOV_INSTRUMENT := n > + > +# remove the SCS flags from all objects in this directory > +KBUILD_CFLAGS := $(filter-out -ffixed-x18 $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) Acked-by: Will Deacon Will