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=-10.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 A5238C433E0 for ; Mon, 8 Feb 2021 14:24:48 +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 3F01864E7C for ; Mon, 8 Feb 2021 14:24:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F01864E7C Authentication-Results: mail.kernel.org; dmarc=fail (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:MIME-Version:In-Reply-To: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=SFlPGIxyTQKnDytkmwegC9OzCkRLW8W+2yHy9iqelZk=; b=YRC1C8C4Sic4mFjQ9yJIojagw u/40vtvuSB18kjprxyHsT6LZz2aX9x1suipLzlOVUPzDpBy3YEV+VTapf+rh9KLgQ9pwCccJrc/JY rkKVKYt35IugxoQsAvewxhhnturcB6t5PMpI69qVhqM8nODQZOLfYdpKOOz6oObseoNo5+V5EqRk9 V2qzVtWtCd+srvb5vscNdRQHNiRAK6bSsrbgpDJBBLxZL8DE1phUZDA9FaxvSOdwcT8o2herpl8KK s+tyoh3jhIvJtQ007W2HCMtoH37OR3GMWZUtyUwVGM1Dkx3SoqgC1s2FXcAiJsRCRAcjUdrz0OJ0K R8b85PL/g==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l97RK-0004Sj-7i; Mon, 08 Feb 2021 14:22:58 +0000 Received: from mail-eopbgr10081.outbound.protection.outlook.com ([40.107.1.81] helo=EUR02-HE1-obe.outbound.protection.outlook.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l97NG-0002Cs-TT for linux-arm-kernel@lists.infradead.org; Mon, 08 Feb 2021 14:18:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ekzSZ/ftPVXtQ/z88Qkxx7DkVFmY2EMAGjEwAEqtYws=; b=+AUlhgTRLW8sduZQdHpevwSl0F7g674LCx6WMQgUV7V0tu7GnOGrwf8Ibh4MiUlBGlDST5NRXou66e/Q3cuVC/eHQgIAV2LK3ln+dr2S5JftnxYsx8a5JbvY1ULmdw4WHyBe6V/YCnmHqjrs93C9l+uY/nGhixETjBG8jib2KNQ= Received: from DB7PR05CA0041.eurprd05.prod.outlook.com (2603:10a6:10:2e::18) by AM0PR08MB3217.eurprd08.prod.outlook.com (2603:10a6:208:5e::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.29; Mon, 8 Feb 2021 14:13:41 +0000 Received: from DB5EUR03FT062.eop-EUR03.prod.protection.outlook.com (2603:10a6:10:2e:cafe::9c) by DB7PR05CA0041.outlook.office365.com (2603:10a6:10:2e::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.17 via Frontend Transport; Mon, 8 Feb 2021 14:13:41 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 63.35.35.123) smtp.mailfrom=arm.com; lists.infradead.org; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com;lists.infradead.org; dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 63.35.35.123 as permitted sender) receiver=protection.outlook.com; client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com; Received: from 64aa7808-outbound-1.mta.getcheckrecipient.com (63.35.35.123) by DB5EUR03FT062.mail.protection.outlook.com (10.152.20.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3784.11 via Frontend Transport; Mon, 8 Feb 2021 14:13:41 +0000 Received: ("Tessian outbound 587c3d093005:v71"); Mon, 08 Feb 2021 14:13:41 +0000 X-CheckRecipientChecked: true X-CR-MTA-CID: 0807323ec6b9696e X-CR-MTA-TID: 64aa7808 Received: from c31f5908ff31.2 by 64aa7808-outbound-1.mta.getcheckrecipient.com id 1643AFAC-3923-42B1-958B-3A8EABEAF50F.1; Mon, 08 Feb 2021 14:13:35 +0000 Received: from EUR02-AM5-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id c31f5908ff31.2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Mon, 08 Feb 2021 14:13:35 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=AaBv6jDjz7HNb3weufVZKm262wEzsROXpuXxMheLxoU548OQErvzKRfdUrZ6z1N+XLgVJtaG0h/awLBBxoWo+6XLl/vM7H5ArsqrMBlRJAlYGEUD0/5c8W0kWOKw7TzS4w75pUQZdk3/IWdQPuyeKsTHqI+AaLIrMteuF02kW3UR5dbd/XuSgiBJVp5r/U1Q+MDCW9cVv4YJwrikuRSqf9B0a3wO4CTMfAvAiKLud6lwrIBvlJXdp6uuKf0JKG5RZqFe9+a7NovWocadBwuC/AVvrc+qh0pXdrzNEwgiVZQ7oNVdoMMUPLfoSsGtJUtVZQwtyNEUGRtrlDNCCAvJqQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ekzSZ/ftPVXtQ/z88Qkxx7DkVFmY2EMAGjEwAEqtYws=; b=SAbbUaqzo4u+bo6fn9FmCVwSkB83WjvoMuRPuwhZdoRix4NlKBhoR4tg1LPlAyKJzaLWnwTGwXdR7qc4mT4gkyXmjoWFQq8Ts+sEE98nFjN9505PeO26xQjUVM3xUT9f725xXyyLSjIKeRCrJJfLbo/d6r54DbCoC6TlUyLamdahLEJvh9KBb1+kBphdebs2/cpF+uvaNCFwwGTHxDYngMMG9xFcHUWhUdqUlyV88jy3mslp/ETaOqjzkQDqvq5N7xEc4yqHJPUpgsSYXFmRljaTOW9AIjO5BqzV3MVeFSZxqmS3Q0hV9WScsVbuJW7MvuP2GkG3wbIuLlT/LHFLtg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ekzSZ/ftPVXtQ/z88Qkxx7DkVFmY2EMAGjEwAEqtYws=; b=+AUlhgTRLW8sduZQdHpevwSl0F7g674LCx6WMQgUV7V0tu7GnOGrwf8Ibh4MiUlBGlDST5NRXou66e/Q3cuVC/eHQgIAV2LK3ln+dr2S5JftnxYsx8a5JbvY1ULmdw4WHyBe6V/YCnmHqjrs93C9l+uY/nGhixETjBG8jib2KNQ= Authentication-Results-Original: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=arm.com; Received: from PA4PR08MB6320.eurprd08.prod.outlook.com (2603:10a6:102:e5::9) by PA4PR08MB6238.eurprd08.prod.outlook.com (2603:10a6:102:e8::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.30; Mon, 8 Feb 2021 14:13:33 +0000 Received: from PA4PR08MB6320.eurprd08.prod.outlook.com ([fe80::60f0:3773:69b8:e336]) by PA4PR08MB6320.eurprd08.prod.outlook.com ([fe80::60f0:3773:69b8:e336%2]) with mapi id 15.20.3825.030; Mon, 8 Feb 2021 14:13:33 +0000 Date: Mon, 8 Feb 2021 14:13:30 +0000 From: Szabolcs Nagy To: Will Deacon Subject: Re: [PATCH] arm64: bti: Set PROT_BTI on all BTI executables mapped by the kernel Message-ID: <20210208141329.GC8542@arm.com> References: <20210205173837.39315-1-broonie@kernel.org> <20210205175128.GB12697@gaia> <20210208124451.GB25618@willie-the-truck> Content-Disposition: inline In-Reply-To: <20210208124451.GB25618@willie-the-truck> User-Agent: Mutt/1.9.4 (2018-02-28) X-Originating-IP: [217.140.106.50] X-ClientProxiedBy: LO2P265CA0513.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:13b::20) To PA4PR08MB6320.eurprd08.prod.outlook.com (2603:10a6:102:e5::9) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from arm.com (217.140.106.50) by LO2P265CA0513.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:13b::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.20 via Frontend Transport; Mon, 8 Feb 2021 14:13:32 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 477d0ee6-e6cd-4d18-4ba2-08d8cc3bbca5 X-MS-TrafficTypeDiagnostic: PA4PR08MB6238:|AM0PR08MB3217: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:10000;OLM:10000; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:PA4PR08MB6320.eurprd08.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(346002)(396003)(39850400004)(136003)(366004)(376002)(16526019)(8676002)(186003)(33656002)(4326008)(956004)(2616005)(1076003)(316002)(8936002)(86362001)(6916009)(66946007)(2906002)(26005)(83380400001)(54906003)(66556008)(7696005)(36756003)(66476007)(44832011)(966005)(478600001)(55016002)(52116002)(8886007)(5660300002); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?dUI1ZWlMcEZ2TVA5TlhjbWVWdW1wZmRXTDI3MlhUZ041Ym9JVkVWUzVySjlH?= =?utf-8?B?SDVOQk5EUFRiQVF1Z1JJUkFCeXRBZllhK0REeWhKQ21rc2xyM0FCdTlLdmFh?= =?utf-8?B?QmprN0N1V2hsT05RWUx3ZDQ4ZDNBa1o3bFdNWnNSWkphODZwTytza1pxeXVJ?= =?utf-8?B?SFcwSWR3U3FjUzVBWjhJbURKWUpUSmIxa0duT09UTlBlSWd6N1lmeVNXUkd0?= =?utf-8?B?TThTZlVhTzc4eGhJTU9ZWi9XNjVwT2w2UzVEOXp6Ky9LTnVEQkFzUXBSVWxx?= =?utf-8?B?ZmtPTkRvbXpqT1pwdW1FUzJTa0pJMnVQS2RPNVU1NXpjNU54eEMvTm5IamIx?= =?utf-8?B?NlR4eW5BVm1jNHZCWWg4RHdJZ1dEK013bjBvMTY4Qk5OUGM1VUlUSHc0Nm9P?= =?utf-8?B?LzNwU3JMcWgxUXQwbnpaQ05SZWxYMFg3RVB4YkFiTUNsQmRFaWJ5TVBqNlRD?= =?utf-8?B?cmt4eWVydjNEVDV4czBzZDI1K0U5c1hrSUlVT1cwYS9rVzgweXU2Q1pjbGRM?= =?utf-8?B?SDZ3NE1EVGJrRUN2TTczNDVhNTZoZVRjZ2J6NHpRamNBMDlyNHFCcjNTMVR0?= =?utf-8?B?VTVIY2pGUUNKNXR6OWxNT21MYUVkUzRiUWg5T3R6VzZKOUNOYzhNYWpQZzhr?= =?utf-8?B?UUwrMER6SzVCWkZOZHd5UlQ3SG1mNmtWaUJrR24zd24wenRnVWxFeE9SL3Zn?= =?utf-8?B?SUZTQ0RpUTRSdEh2ZHhJaUR6ODNmQXlXK1hxaHNLUmI1Y2RDek9NUi91TTdJ?= =?utf-8?B?MFFUWnZJMkp6VzRUTlNFWmNVTlRKajNxNmZkcWJ2eW4yQUl2QjIyeWNDTzNs?= =?utf-8?B?VElSUStuMzNCYlFZTGZyTlEzZ2VlQklFa29vVWRRS011c2pSclRlSkRwSTUw?= =?utf-8?B?VXhEVXh3RnZTOTNvcWEyWVFHZWU2L2tGQlo5WElxV2J2ZXFjc1lEY1RWWHpC?= =?utf-8?B?R3ZCbUFZVHY3N1Y3TmpVZFdhY3FEL2d5Ujd6WS9WWGlFRXE4dGRFOUxESE50?= =?utf-8?B?L2VhYnM4OTcxc0VmandoUXMwbTF6cFFXdE03Z05KV3Z4eCtJa0U2anIyTnJZ?= =?utf-8?B?cE5aSEV2ck5LZ2dwVmVtZmV4Q0g2cFlGVWxPckI4dXc3TkdMVWtHa2FBZERm?= =?utf-8?B?TUJTNzdOaFRoTFNHOWxZakNTdEYyN2hNLzJpV0d3UWp2cVRKUXJ1NzBscnE5?= =?utf-8?B?Qng4M3ZnNVFQTnlORmtCbUhxenlsS01iUmEyNUFPZFFVamo2dHc4VWE3RjZH?= =?utf-8?B?T1lPUVJENXZLQ2p2bkVsbDFVRGZjRldIUDZLOTZoNWpKSmdkY3phSHd6bXYz?= =?utf-8?B?azhJbnRyVmRpNG9TUmNSZ0szdjVEUzZ6TjBNNm4wdFZhU29QSzA0aC95YVpL?= =?utf-8?B?cGR4VmJ0emVHUkxFVEkwcHorcWdJOWNqalJnNm4ra3VmTDZpRXZEMGxoZEE0?= =?utf-8?B?L3d5V0ZtbGkvZTlkcjRYN2hkSGl4d2tIYUdkSmZZakRtbk53K2VqMVpUeDh0?= =?utf-8?B?M1FLaU92UHdKZFVHRk9VWG1Za0FhZmt6aTJRbmVPT0UxQUNmaEhKT3ZrNGpV?= =?utf-8?B?a2FaS3IvNjJrV1FRWkhsaFlKNzUyUThGQkZ1bDkwRGhUYm5kWWwxOGxCNTFX?= =?utf-8?B?MU1XZ3VDdElZbHZSSFJVelpBL2o5c01sZkltOHM2T0o0cFJRV1IzWXYyeXNp?= =?utf-8?B?cmpzV2p6ejZIN2llSnFabmkrSlhZMEs3SlZ3cEZEU015SlVnUkpmckFOOE5X?= =?utf-8?Q?KrXuACj3ExmO4iYuCXCJ18GoCT9+RTc9Wc9omz3?= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA4PR08MB6238 Original-Authentication-Results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=arm.com; X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: DB5EUR03FT062.eop-EUR03.prod.protection.outlook.com X-MS-Office365-Filtering-Correlation-Id-Prvs: 325df559-0795-49bf-7351-08d8cc3bb7ae X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:63.35.35.123; CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(4636009)(136003)(346002)(39860400002)(396003)(376002)(46966006)(36840700001)(966005)(2616005)(5660300002)(82310400003)(83380400001)(70206006)(2906002)(7696005)(44832011)(478600001)(107886003)(316002)(55016002)(33656002)(36756003)(82740400003)(4326008)(16526019)(336012)(36860700001)(8676002)(186003)(8886007)(86362001)(81166007)(47076005)(54906003)(70586007)(356005)(8936002)(956004)(1076003)(6862004)(26005); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Feb 2021 14:13:41.2931 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 477d0ee6-e6cd-4d18-4ba2-08d8cc3bbca5 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT062.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB3217 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210208_091847_350903_746C29E2 X-CRM114-Status: GOOD ( 27.81 ) 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 , libc-alpha@sourceware.org, Kees Cook , Catalin Marinas , Jeremy Linton , Mark Brown , 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+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The 02/08/2021 12:44, Will Deacon wrote: > On Fri, Feb 05, 2021 at 05:51:29PM +0000, Catalin Marinas wrote: > > On Fri, Feb 05, 2021 at 05:38:37PM +0000, Mark Brown wrote: > > > Currently for dynamically linked executables the kernel only enables > > > PROT_BTI for the interpreter, the interpreter is responsible for > > > enabling it for everything else including the main executable. > > > Unfortunately this interacts poorly with systemd's > > > MemoryDenyWriteExecute feature which uses a seccomp filter to prevent > > > setting PROT_EXEC on already mapped memory via mprotect(), it lacks the > > > context to detect that PROT_EXEC is already set and so refuses to allow > > > the mprotect() on the main executable which the kernel has already > > > mapped. > > > > > > Since we don't want to force users to choose between having MDWX and BTI > > > as these are othogonal features have the kernel enable PROT_BTI for all > > > the ELF objects it loads, not just the dynamic linker. This means that > > > if there is a problem with BTI it will be harder to disable at the > > > executable level but we currently have no conditional support for this > > > in any libc anyway so that would be new development. Ideally we would > > > have interfaces that allowed us to more clearly specify what is enabled > > > and disabled by a given syscall but this would be a far more difficult > > > change to deploy. > > > > > > Reported-by: Jeremy Linton > > > Suggested-by: Catalin Marinas > > > Signed-off-by: Mark Brown > > > Cc: Mark Rutland > > > Cc: Szabolcs Nagy > > > Cc: Dave Martin > > > Cc: Kees Cook > > > Cc: libc-alpha@sourceware.org > > > > Thanks Mark for putting the patch together. You may want to add a > > reference to some of the discussions around the ABI, one of them: > > > > Link: https://lore.kernel.org/r/20201207200338.GB24625@arm.com/ > > > > (so we can keep Szabolcs accountable if something breaks ;)) > > > > For this patch: > > > > Reviewed-by: Catalin Marinas > > > > I wouldn't merge it as a fix yet but I'm ok with getting in 5.12 if Will > > is ok. It would give us some time to revert. > > I'd like an Ack from Szabolcs before we queue this. > > Will i'm ok with this in principle, but i will rerun the glibc tests over night to be sure. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel