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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 27261C2D0DB for ; Mon, 20 Jan 2020 14:24:25 +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 E70C722522 for ; Mon, 20 Jan 2020 14:24:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="phLO+4Gm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E70C722522 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-Type: Content-Transfer-Encoding:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=VfRhIQreXQHZl4bQRrOQBXGPxMGmuzCt/7xOVCBbCKk=; b=phLO+4GmpkzL9q65Q1UhLLrdw UBNaLakZmltwUaNjhdmJoqQ2S+48EsDZFHxdZ+TLP7E1NBYTI+Ng2Yaxkp3W2ZWyk79YUQbPWoPLi mGbTSiB3NOtce2KoU2tYPq/AIgDc3e0dEP/63tNLRKg50Xv1UwBEjm716ilpkIQ90zqfL89kjZDdK Bx07/Jz/+Sw9XSQLStqalGdwZDqqZIzPtMYrCYmeP8+411Y0kR4UFtHtscuxkNxvOChu2LQIffjFb 3IcY4rRv842bJrOuuTbYPm1d+QhA3figW08FLhugZfeb0i4yR+8hvF3a8ITORkVFhKLMeO6AK6dbT xIKpT6TYQ==; 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 1itXya-0002p0-K7; Mon, 20 Jan 2020 14:24:24 +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 1itXyT-0002nS-35 for linux-arm-kernel@lists.infradead.org; Mon, 20 Jan 2020 14:24:23 +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 6CBB630E; Mon, 20 Jan 2020 06:24:14 -0800 (PST) Received: from [10.1.37.58] (a075563-lin.cambridge.arm.com [10.1.37.58]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2BE253F52E; Mon, 20 Jan 2020 06:24:12 -0800 (PST) Subject: Re: [PATCH v3 13/16] arm64: kprobe: disable probe of ptrauth instruction To: Catalin Marinas References: <1576486038-9899-1-git-send-email-amit.kachhap@arm.com> <1576486038-9899-14-git-send-email-amit.kachhap@arm.com> <20200117111614.GE26090@arrakis.emea.arm.com> From: Amit Kachhap Message-ID: <1ac2f3b9-7821-b3eb-e78d-859e768b8a10@arm.com> Date: Mon, 20 Jan 2020 14:24:10 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20200117111614.GE26090@arrakis.emea.arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200120_062417_177792_1283E020 X-CRM114-Status: GOOD ( 13.02 ) 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/17/20 11:16 AM, Catalin Marinas wrote: > On Mon, Dec 16, 2019 at 02:17:15PM +0530, Amit Daniel Kachhap wrote: >> This patch disables the probing of authenticate ptrauth >> instruction which falls under the hint instructions region. >> This is done to disallow probe of instruction which may lead >> to ptrauth faults. >> >> The corresponding append pac ptrauth instruction is not >> disabled as they are typically the first instruction in the >> function so disabling them will be disabling the function >> probe itself. Also, appending pac do not cause any exception >> in itself. > > Neither does AUTIASP in v8.3, only the subsequent dereferencing, so why > can kprobes cope with PACIASP but not AUTIASP? ok I will add this patch as part of FPAC in armv8.6 ptrauth. > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel