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=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 92ABFC433E2 for ; Wed, 2 Sep 2020 16:49:50 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 431EF20767 for ; Wed, 2 Sep 2020 16:49:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="viV9GgO/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 431EF20767 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+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=merlin.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=O4ZDanTIumnFTMh2guWsCEEhz+MWitduI732l3AULaE=; b=viV9GgO/leMnlt+drGeZgYs5g O8XP2V4MsXaQ40+PpqlvWisTEXCTToUpV5C2CJWUk74Um662fpO78T6xCCBFxvmQNJ6MghJKXFBxE KV01g2jYVXCaadM0ZGcXqJBP0l8lkND/b0031U/hSCJD6JhZITRVWnGuMtDf6/rBHrfCJBj4ji7ud G7DzV5lvdj312KerKXXTkmGsbLbto8kVg2VAXwnzDLCbe3vtxsOR1keDLp2KJ1bZchMKQ61QXLmEy AMjgSPgqUEGrxytqMXsSACxlD9zGLGeJb5+tQ6fDP2z8dcJIrlrwg5xPuZEUkR87rgUxGSC+ksqgY OwNDu781g==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kDVw2-0000dO-KL; Wed, 02 Sep 2020 16:48:34 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kDVvz-0000cS-R8 for linux-arm-kernel@lists.infradead.org; Wed, 02 Sep 2020 16:48:32 +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 7F34E1045; Wed, 2 Sep 2020 09:48:29 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2FFFE3F66F; Wed, 2 Sep 2020 09:48:28 -0700 (PDT) Date: Wed, 2 Sep 2020 17:48:26 +0100 From: Dave Martin To: Boyan Karatotev Subject: Re: [PATCH 0/4] kselftests/arm64: add PAuth tests Message-ID: <20200902164825.GH6642@arm.com> References: <20200828131606.7946-1-boyan.karatotev@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200828131606.7946-1-boyan.karatotev@arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200902_124831_974938_CA467C02 X-CRM114-Status: GOOD ( 21.27 ) 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: Shuah Khan , boian4o1@gmail.com, Catalin Marinas , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, amit.kachhap@arm.com, vincenzo.frascino@arm.com, Will Deacon , 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+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Aug 28, 2020 at 02:16:02PM +0100, Boyan Karatotev wrote: > Pointer Authentication (PAuth) is a security feature introduced in ARMv8.3. > It introduces instructions to sign addresses and later check for potential > corruption using a second modifier value and one of a set of keys. The > signature, in the form of the Pointer Authentication Code (PAC), is stored > in some of the top unused bits of the virtual address (e.g. [54: 49] if > TBID0 is enabled and TnSZ is set to use a 48 bit VA space). A set of > controls are present to enable/disable groups of instructions (which use > certain keys) for compatibility with libraries that do not utilize the > feature. PAuth is used to verify the integrity of return addresses on the > stack with less memory than the stack canary. > > This patchset adds kselftests to verify the kernel's configuration of the > feature and its runtime behaviour. There are 7 tests which verify that: > * an authentication failure leads to a SIGSEGV > * the data/instruction instruction groups are enabled > * the generic instructions are enabled > * all 5 keys are unique for a single thread > * exec() changes all keys to new unique ones > * context switching preserves the 4 data/instruction keys > * context switching preserves the generic keys > > The tests have been verified to work on qemu without a working PAUTH > Implementation and on ARM's FVP with a full or partial PAuth > implementation. > > Note: This patchset is only verified for ARMv8.3 and there will be some > changes required for ARMv8.6. More details can be found here [1]. Once > ARMv8.6 PAuth is merged the first test in this series will required to be > updated. Nit: is it worth running checkpatch over this series? Although this is not kernel code, there are a number of formatting weirdnesses and surplus blank lines etc. that checkpatch would probably warn about. [...] Cheers ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel