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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=no 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 169A2C33CB1 for ; Fri, 17 Jan 2020 10:23:07 +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 D358A2082F for ; Fri, 17 Jan 2020 10:23:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="M2E+rFa/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D358A2082F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com 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=qEUrC9NEG/1549/XoWGJLjVeiJGNxi4xlnPE95DfIx8=; b=M2E+rFa/AdqgKB 9SKknDq1tw9p7bpts+/vbVhV5tV2LcTDXujmwzCpBCLZICPPnDIsMJPrUkQZ8i0SGfRtQIebSYcgG AOGPGY5Xg/jgI9sQ4FrZDET/fOGvM1k2cEQT3FLoGwLs/XEpKyMhZtW7syAn1TA3wMc+tggNLlXbw IKP8ruViHph9Yf24h/YcyUfzhTJTYw8RGMTV304rLXiyEUcg/Q1of3D3IdUJDtONmWVXZcBXJk5Yz hAR4++YBhwVnnoFHOvtI28n0qEetalH80TSl1zN5G8ACPkpvnkyQ0viZz70K7tjZDyieGihaD2EbH fUfAfWYE6JwEhlO8qsvg==; 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 1isOmP-0004ri-Sx; Fri, 17 Jan 2020 10:23:05 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1isOmG-0004nh-EE for linux-arm-kernel@lists.infradead.org; Fri, 17 Jan 2020 10:23:03 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8BA9711D4; Fri, 17 Jan 2020 02:22:55 -0800 (PST) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.197.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C668F3F68E; Fri, 17 Jan 2020 02:22:53 -0800 (PST) Date: Fri, 17 Jan 2020 10:22:51 +0000 From: Catalin Marinas To: Amit Daniel Kachhap Subject: Re: [PATCH v3 10/16] arm64: unwind: strip PAC from kernel addresses Message-ID: <20200117102251.GB26090@arrakis.emea.arm.com> References: <1576486038-9899-1-git-send-email-amit.kachhap@arm.com> <1576486038-9899-11-git-send-email-amit.kachhap@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1576486038-9899-11-git-send-email-amit.kachhap@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200117_022257_052055_F55EA320 X-CRM114-Status: UNSURE ( 8.43 ) X-CRM114-Notice: Please train this message. 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 , Suzuki K Poulose , Ard Biesheuvel , Richard Henderson , Kristina Martsenko , James Morse , Ramana Radhakrishnan , Mark Brown , Vincenzo Frascino , Will Deacon , 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 Mon, Dec 16, 2019 at 02:17:12PM +0530, Amit Daniel Kachhap wrote: > From: Mark Rutland > > When we enable pointer authentication in the kernel, LR values saved to > the stack will have a PAC which we must strip in order to retrieve the > real return address. > > Strip PACs when unwinding the stack in order to account for this. > > Reviewed-by: Kees Cook > Signed-off-by: Mark Rutland > Signed-off-by: Kristina Martsenko > [Amit: Re-position ptrauth_strip_insn_pac, comment] > Signed-off-by: Amit Daniel Kachhap Acked-by: Catalin Marinas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel