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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 8A874C33CB1 for ; Fri, 17 Jan 2020 11:16:28 +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 5C80320730 for ; Fri, 17 Jan 2020 11:16:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="pTtk6K9x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5C80320730 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=WvbLX+po1YFIeH6xhiq/v+pZTXxZJ1oz0hnyKX5klyE=; b=pTtk6K9xiRuk2S J2OstlwGBMlBuN6yQf+pfEowv7eym58TeitB4SrIzbkxDXY2DdIUS09rjTT/hRtyeVCnAtjn8L+bf BczQZP6k1Wu0IJfMgxW485rlQ3vZLFx5dkY/NHpuAjamlJN71Wvm3kVfgu3N9DVWpaEAlMDeZZIYP VO7rIBf/7vc/J+Zgwa7xfPBSza5QV65IlvfzamGsinWDzlFK54shVP1PUcGZUVrSznknKpXUrCcH5 MewwgQjCHHT/WYPoLJVqNCIB36GYCVCy1dz8WPjQsVTEEYQve7bthlgdCIH3bkmvz8To2m3hY9A+e fTizWz3hfIGub3XZipOQ==; 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 1isPc3-0002ih-Aa; Fri, 17 Jan 2020 11:16:27 +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 1isPbv-0002i8-9U for linux-arm-kernel@lists.infradead.org; Fri, 17 Jan 2020 11:16:25 +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 4915F11D4; Fri, 17 Jan 2020 03:16:18 -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 7FCCA3F68E; Fri, 17 Jan 2020 03:16:16 -0800 (PST) Date: Fri, 17 Jan 2020 11:16:14 +0000 From: Catalin Marinas To: Amit Daniel Kachhap Subject: Re: [PATCH v3 13/16] arm64: kprobe: disable probe of ptrauth instruction Message-ID: <20200117111614.GE26090@arrakis.emea.arm.com> References: <1576486038-9899-1-git-send-email-amit.kachhap@arm.com> <1576486038-9899-14-git-send-email-amit.kachhap@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1576486038-9899-14-git-send-email-amit.kachhap@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200117_031619_375159_D6065482 X-CRM114-Status: UNSURE ( 9.91 ) 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 02:17:15PM +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? -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel