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[209.132.180.67]) by mx.google.com with ESMTP id b78-v6si4869793pfk.342.2018.06.27.08.25.22; Wed, 27 Jun 2018 08:25:36 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@armh.onmicrosoft.com header.s=selector1-arm-com header.b=ToSu+m8D; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754678AbeF0PIV (ORCPT + 99 others); Wed, 27 Jun 2018 11:08:21 -0400 Received: from mail-he1eur01on0083.outbound.protection.outlook.com ([104.47.0.83]:4398 "EHLO EUR01-HE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752437AbeF0PIR (ORCPT ); Wed, 27 Jun 2018 11:08:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector1-arm-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=LpyBq/gFWWWywlWXAUuqvIVSyX+NV0igGNwzWTktnsA=; b=ToSu+m8DDRiF2nUCYT4G7US027b9hOVOcHwoCvyWb4NP/4Cug1gPjkxxIk9LBkhP/VehDm0s3NjuRWOzMSmk4Sa7Cy4xGpEUeLr+L/RF4seaRD/Zx7Rn5/PlyaycHHiXGsC0gkMbCP4myEnp4lFRqzummKXwlJAv/QE1VdB1E6k= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Ramana.Radhakrishnan@arm.com; Received: from [10.2.206.71] (217.140.96.140) by AM4PR08MB2788.eurprd08.prod.outlook.com (2603:10a6:205:d::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.884.24; Wed, 27 Jun 2018 15:08:12 +0000 Subject: Re: [PATCH v4 0/7] arm64: untag user pointers passed to the kernel To: Andrey Konovalov , Catalin Marinas Cc: Will Deacon , Mark Rutland , Robin Murphy , Al Viro , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Linux ARM , "linux-doc@vger.kernel.org" , Linux Memory Management List , "linux-arch@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , LKML , Chintan Pandya , Jacob Bramley , Ruben Ayrapetyan , Lee Smith , Kostya Serebryany , Dmitry Vyukov , Evgeniy Stepanov , nd References: <20180626172900.ufclp2pfrhwkxjco@armageddon.cambridge.arm.com> From: Ramana Radhakrishnan Message-ID: <0cef1643-a523-98e7-95e2-9ec595137642@arm.com> Date: Wed, 27 Jun 2018 16:08:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Thunderbird/57.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [217.140.96.140] X-ClientProxiedBy: AM0PR01CA0027.eurprd01.prod.exchangelabs.com (2603:10a6:208:69::40) To AM4PR08MB2788.eurprd08.prod.outlook.com (2603:10a6:205:d::18) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cf2e6d48-6360-49f2-c7dc-08d5dc3fcd86 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1;AM4PR08MB2788;7:a9YGl4yhoQy4awJgDHZOGSwqN9gXfUgha7+K1RI4tA8OYchk/8arNEH6HvXYOuHwpycMRY32BZJnOvNB64HLU2NvpMcZ4jg3/CB7l5+4qe04YkyuBPiTMLal1ocWk2ugug/oPHHnS7xp13mic1761umx/nKavVOXzIWFLGjtqpy4UiZQiuRvweO8oS4RAb7eC8FYtjYiGV3F6xyI0hjpvDtQIdYcOPFZoAHEX2hdZw83isQmsJHawvarYS8ivq66 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jun 2018 15:08:12.1949 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cf2e6d48-6360-49f2-c7dc-08d5dc3fcd86 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR08MB2788 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27/06/2018 16:05, Andrey Konovalov wrote: > On Tue, Jun 26, 2018 at 7:29 PM, Catalin Marinas > wrote: >> Hi Andrey, >> >> On Tue, Jun 26, 2018 at 02:47:50PM +0200, Andrey Konovalov wrote: >>> On Wed, Jun 20, 2018 at 5:24 PM, Andrey Konovalov wrote: >>>> arm64 has a feature called Top Byte Ignore, which allows to embed pointer >>>> tags into the top byte of each pointer. Userspace programs (such as >>>> HWASan, a memory debugging tool [1]) might use this feature and pass >>>> tagged user pointers to the kernel through syscalls or other interfaces. >>>> >>>> This patch makes a few of the kernel interfaces accept tagged user >>>> pointers. The kernel is already able to handle user faults with tagged >>>> pointers and has the untagged_addr macro, which this patchset reuses. >>>> >>>> We're not trying to cover all possible ways the kernel accepts user >>>> pointers in one patchset, so this one should be considered as a start. >>>> >>>> Thanks! >>>> >>>> [1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html >>> >>> Is there anything I should do to move forward with this? >>> >>> I've received zero replies to this patch set (v3 and v4) over the last >>> month. >> >> The patches in this series look fine but my concern is that they are not >> sufficient and we don't have (yet?) a way to identify where such >> annotations are required. You even say in patch 6 that this is "some >> initial work for supporting non-zero address tags passed to the kernel". >> Unfortunately, merging (or relaxing) an ABI without a clear picture is >> not really feasible. >> >> While I support this work, as a maintainer I'd like to understand >> whether we'd be in a continuous chase of ABI breaks with every kernel >> release or we have a better way to identify potential issues. Is there >> any way to statically analyse conversions from __user ptr to long for >> example? Or, could we get the compiler to do this for us? > > > OK, got it, I'll try to figure out a way to find these conversions. This sounds like the kind of thing we should be able to get sparse to do already, no ? It's been many years since I last looked at it but I thought sparse was the tool of choice in the kernel to do this kind of checking. regards Ramana > > Thanks! >