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=-5.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 C562FC33CAF for ; Thu, 16 Jan 2020 18:20:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A10A020663 for ; Thu, 16 Jan 2020 18:20:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="LBbvVYnO"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="aoQqHHUe" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A10A020663 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=MlDhQ2uCVSxxKw/VklfJMEfC8CPRZJNua2WhxUS43dg=; b=LBbvVYnObkqASk 7LABv2po0PTyWOKQekfNkULW9WWjqXhaC7+BUeiuTSVBtdI296Woivsxaan4IzXTT1+d/XH/ANIns LiHQLeIqU9MsUiDaQ048J2aA7bTySSCPEtrYcInsjCrgMMFh0JGuyWBegCWqM4Q1MGJaclusCzDqA 99/Y6R/I7KXB6pS+7+Kt+NR6lmFQIy+DKfXLczp+c1qR2oQbK9GgnZOBU3Vk0owZ8TgboTMyKKctR Lfenbqe/O3LEFK43v+tS+FhDqLl3fsMi6T3vTDgj4n0dTorGhG1JxwTx30T7/mM8/Uxve1FVEn/cG 5RH3FqMjLcpA6lXRA/DA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1is9l1-0005TF-Ez; Thu, 16 Jan 2020 18:20:39 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1is95i-00077y-Cj for linux-arm-kernel@lists.infradead.org; Thu, 16 Jan 2020 17:38:23 +0000 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 9E60A246C6; Thu, 16 Jan 2020 17:37:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579196266; bh=8SPtXhgDABdtkfo2azlbC9YC/FrYRauKdCnSEeS0iXM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=aoQqHHUeXgvXc3azh487blarI0nv3o9hiUY19N5hBxZdSanJP57l8QoyH8C3FOFjC fLQ8JocSkcenfCgyEQRD2Ifv3ibu/nrKUInfNAWFxvAldWYgdgJIldKkvBmgdKx2w0 hqYJXkIVAjhzdK2jGG3gP7p0i0lxRgVM6+nUpx58= Date: Thu, 16 Jan 2020 17:37:40 +0000 From: Will Deacon To: Sami Tolvanen Subject: Re: [PATCH v6 09/15] arm64: reserve x18 from general allocation with SCS Message-ID: <20200116173739.GA21396@willie-the-truck> References: <20191018161033.261971-1-samitolvanen@google.com> <20191206221351.38241-1-samitolvanen@google.com> <20191206221351.38241-10-samitolvanen@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191206221351.38241-10-samitolvanen@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200116_093758_535244_3573214E X-CRM114-Status: GOOD ( 10.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Kees Cook , Ard Biesheuvel , Masahiro Yamada , Catalin Marinas , Jann Horn , Nick Desaulniers , linux-kernel@vger.kernel.org, Steven Rostedt , Miguel Ojeda , clang-built-linux@googlegroups.com, Masami Hiramatsu , Marc Zyngier , kernel-hardening@lists.openwall.com, Laura Abbott , Dave Martin , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Dec 06, 2019 at 02:13:45PM -0800, Sami Tolvanen wrote: > Reserve the x18 register from general allocation when SCS is enabled, > because the compiler uses the register to store the current task's > shadow stack pointer. Note that all external kernel modules must also be > compiled with -ffixed-x18 if the kernel has SCS enabled. > > Signed-off-by: Sami Tolvanen > Reviewed-by: Nick Desaulniers > Reviewed-by: Kees Cook > --- > arch/arm64/Makefile | 4 ++++ > 1 file changed, 4 insertions(+) Acked-by: Will Deacon Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel