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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 58765C48BF6 for ; Wed, 21 Feb 2024 04:18:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-ID:In-Reply-To: References:Message-ID:Date:Subject:CC:To:From:Reply-To:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=kcYDk+OrKN0qLDEAC3Bs6VgdE6i5q/WM4F5hD9FwTx4=; b=eGesq05CIfR0QS paiclV/tzsu7wIy5Li6iVnznJwSbfint0xLpTP2ko0fRk0jSDvBIhdoJ72YWifhdOtMqAElu4JCak gqXNH2Io7BkY+JbDr8k81h+TbLWjsDJ72inpWqx9wTiruFykMKpl6RXvyx8cIE0LK2jZgUKUDC2Bk z2HTnOEVwQJbo45OmDa05fIw9gHY9d6xtTmsej4IAruCDM6g0Os0h1kOWowxUPoa5eelHyD5bLCeX m6lWsOFJR7BhEZ8fJACDlhXBdtwqWm2HoCxD7XUFfXx3T5FFLes+mwNy5SYX0C1orJua3twIhYc+j VqOGBPlNv1ALojyYTRCQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rce3s-0000000H4w4-0cX7; Wed, 21 Feb 2024 04:18:24 +0000 Received: from mgamail.intel.com ([192.198.163.19]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rce3q-0000000H4tc-0ayv; Wed, 21 Feb 2024 04:18:23 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1708489102; x=1740025102; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=AtrkrqX68O98zyA7Neh9JSYjurH/H6HubiPaLloNeIQ=; b=aPNkWR/q4WycCB08dWn72JN9sP6VL2q97yEvtmWdEWQf7cLCWFE7IAqX 0v5a87o/mq8y06uzecQODfBLLAQSxPh3MqESkDdqdUH6XdXLdtT3/GuUA yOBtae5jpjzGW+j18Snsp+rgCVF7RfcxdvtRY8IRAMYVQBXB4G8j3V74y W9RwetZsIC6bkG6UaAR+J7KJ2WSVk3+l5UzvVuQTQlIcB6SFs9NKpTmy7 V8hDn3Z9nuWHVQocp7tfwJrX92LXdhXeo406tEgOpD40AJvvFLIp3Z7xW ofVJiacUI6E/24H7Cj2aDOhODhu+Zz6nYmnsgh80qa5/mniR6oOb3r3QX Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10990"; a="2500445" X-IronPort-AV: E=Sophos;i="6.06,174,1705392000"; d="scan'208";a="2500445" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2024 20:18:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,174,1705392000"; d="scan'208";a="5349897" Received: from fmsmsx602.amr.corp.intel.com ([10.18.126.82]) by orviesa006.jf.intel.com with ESMTP/TLS/AES256-GCM-SHA384; 20 Feb 2024 20:18:10 -0800 Received: from fmsmsx610.amr.corp.intel.com (10.18.126.90) by fmsmsx602.amr.corp.intel.com (10.18.126.82) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 20 Feb 2024 20:18:09 -0800 Received: from fmsedg602.ED.cps.intel.com (10.1.192.136) by fmsmsx610.amr.corp.intel.com (10.18.126.90) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35 via Frontend Transport; Tue, 20 Feb 2024 20:18:09 -0800 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (104.47.56.169) by edgegateway.intel.com (192.55.55.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Tue, 20 Feb 2024 20:18:08 -0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=UBwly99FpLrp9921GJxXMItPIMZyHLf5ip5y76LtpTAFscMY3j4fazip+CZPXSpL3lL9pcUGBav2Dasv55yumIjqHZwPm/i0uUcUj8QvQk8Qc/wtFq9AoPliYmcdioOq9E+JCnyhIbus6cEtDnBnlgZpUn1PPSjMFrcPHHqo2sY7WzOMcMs1rcg9XkmXX9FhVukS2n+COmGSrHx4bL3gN2oqGlY7+FJROqPWonFVj3QdlHzoWt27B+QtWvkemWuYI+gTWX0Pe3B5JraZTz4uZaSlNKESu7OQS5F1mk7+jgtS0msecHP8nVO+X6CiwgWVHkygCcM8FM4mRXVc6VLPAg== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=AtrkrqX68O98zyA7Neh9JSYjurH/H6HubiPaLloNeIQ=; b=jTni16n0TKZp+ZbwfsOHsncs7Ow4iuVTJfwgnNu3u7J28lawPGVDEDJ9YhegRSmgTMxxlFoukHcwZpa4ApY+JKlGnuab24a5V5oAfRAVj43VJ3mqBEwls5dpkTYx4WB8yDnrDrfskYL4rxX3WWAsGZOAAzwK5WMfEk+a8YzzI8bN1PExW3ByB26x3tG1LPzgltv/PHDdrAv6fid75NZ6gaGbXb1hxD7l1sgxtY0OUROO8mu63dBjWHMKCKqaO7jHKygad439YQFDvfSeozTRtQnMcH+f+r0clNOIKNQ4IsBC0qsB5EIKtmN4jWwT+I+3taU8d+D3+uHdaCR0IA1A4w== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Received: from MN0PR11MB5963.namprd11.prod.outlook.com (2603:10b6:208:372::10) by IA1PR11MB8100.namprd11.prod.outlook.com (2603:10b6:208:445::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7292.38; Wed, 21 Feb 2024 04:18:02 +0000 Received: from MN0PR11MB5963.namprd11.prod.outlook.com ([fe80::5d40:83fd:94ac:d409]) by MN0PR11MB5963.namprd11.prod.outlook.com ([fe80::5d40:83fd:94ac:d409%7]) with mapi id 15.20.7316.018; Wed, 21 Feb 2024 04:18:02 +0000 From: "Edgecombe, Rick P" To: "dalias@libc.org" CC: "linux-arch@vger.kernel.org" , "suzuki.poulose@arm.com" , "Szabolcs.Nagy@arm.com" , "musl@lists.openwall.com" , "linux-fsdevel@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "kvmarm@lists.linux.dev" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "catalin.marinas@arm.com" , "broonie@kernel.org" , "oliver.upton@linux.dev" , "palmer@dabbelt.com" , "debug@rivosinc.com" , "aou@eecs.berkeley.edu" , "shuah@kernel.org" , "arnd@arndb.de" , "maz@kernel.org" , "oleg@redhat.com" , "fweimer@redhat.com" , "keescook@chromium.org" , "james.morse@arm.com" , "ebiederm@xmission.com" , "will@kernel.org" , "brauner@kernel.org" , "hjl.tools@gmail.com" , "linux-kselftest@vger.kernel.org" , "paul.walmsley@sifive.com" , "ardb@kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mm@kvack.org" , "thiago.bauermann@linaro.org" , "akpm@linux-foundation.org" , "sorear@fastmail.com" , "linux-doc@vger.kernel.org" Subject: Re: [musl] Re: [PATCH v8 00/38] arm64/gcs: Provide support for GCS in userspace Thread-Topic: [musl] Re: [PATCH v8 00/38] arm64/gcs: Provide support for GCS in userspace Thread-Index: AQHaVpxQxL7eT1mQek6VcjPJOSVEZ7ETiLSAgAAiyYCAAASHgIAATE8AgAAGrQCAAAuagIAADnuAgAAMOQCAACNjgA== Date: Wed, 21 Feb 2024 04:18:02 +0000 Message-ID: <41b401d59b3846f44cee33f1d680b2534b7c0dea.camel@intel.com> References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> <22a53b78-10d7-4a5a-a01e-b2f3a8c22e94@app.fastmail.com> <4c7bdf8fde9cc45174f10b9221fa58ffb450b755.camel@intel.com> <20240220185714.GO4163@brightrain.aerifal.cx> <9fc9c45ff6e14df80ad023e66ff7a978bd4ec91c.camel@intel.com> <20240220235415.GP4163@brightrain.aerifal.cx> <20240221012736.GQ4163@brightrain.aerifal.cx> <6332963a828d247ef935b7d3352fa1fbd83b11b0.camel@intel.com> In-Reply-To: <6332963a828d247ef935b7d3352fa1fbd83b11b0.camel@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.44.4-0ubuntu2 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: MN0PR11MB5963:EE_|IA1PR11MB8100:EE_ x-ms-office365-filtering-correlation-id: 9caed3a2-545a-4e4c-ae6c-08dc3294185a x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN0PR11MB5963.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(38070700009);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?SDh4NEYyeHdXdXZxT0kvRHpucExJcnpUVFZXMDJGVkVURWlRdk4vMWYzTHcr?= =?utf-8?B?LzVuMmcxOGdvOUl2bTFYL3dwTk96cmRKcEl4WjV1dksvMkYyRkRLYUxDYWxL?= =?utf-8?B?Z1dFMmlRK0N1UGxvRzRuZkFwMUdtai9QYU50akdkb1A2UGtHQmJZMktrRGhX?= =?utf-8?B?Wkh5bnNoZHFJQW9oSmt6aEZUTWxLTDAwOStld1hHTmVpdVNzZDU4eTlzSEJV?= =?utf-8?B?aTlDdlNIWFIyTHMzV1dRRmRCWExBMlhZbUJBWWZlWk9VU0l3RWoyT2FZVDRP?= =?utf-8?B?dzJ0MzVIQXR6cm50TWNYY3U0cTJEL2g0VG5rMGRPTnVyVFJzSHpDenVGc0p2?= =?utf-8?B?S2FZMFJMWGZ3ZUo0STZJNnpJY25lR3RaTlB2TzBBVTBLMmI3d2VuUE9GbC96?= =?utf-8?B?MkxQUjF4azBsalN1T1M0T2h4a2dwdHRMc2dpdENSanluSlRqSTc4ZVRRQ00w?= =?utf-8?B?MnB0WUczVlh5NzRuallCUVpMUWhEVEprRjJzUis2aW15eXJ2ekNQOU1yS2V0?= =?utf-8?B?WW13RU9kNm92V1BzVUwxVUN5TXdjekwwaEgzdTU2YzNNdXBWaGVlalhaWEZj?= =?utf-8?B?dkZnNFVZWEpiUFAwZ1UzbGZGbll6OWtMMDNZc0hxSy9lRHBDak16N1ErTDl1?= =?utf-8?B?aUI3U1kxVW5KT1FHQkpBamRiMWpDWGk5NWg5dkUwcXM0UmxqRFJBamI5Q3Fa?= =?utf-8?B?bTU2RUNBVmwvY1hNWFpnL0NhRGJMSFA2NHFqbU5QR1REV3psNWFHOTJ0K0lo?= =?utf-8?B?dzE4QWVKbXhnWVFrWHpGamtFV1hWcFpySm1XUFFFMTljZWk5V2xjVGFUZXNx?= =?utf-8?B?cXBtYStvNE9zbnFRUlFQT01EYUxaY0o3QlRVdGQ0d3pJSlJ6ci8wRi9kSHR5?= =?utf-8?B?M3VaMTdxSmRibCtXeWF5WXZwRkYzaUxsaHJvb1hVQzY2Z0JTc2xGVG9scUU4?= =?utf-8?B?VHloVTd6WnA5ajVsUGRLUUhRZnhaN0d2MVB2RllyeEIvL2hOUHVPcnkxMFg1?= =?utf-8?B?cjVVZVJENUZpT3N5WGFWejJDcGltM1pxdE5NM1NzdklrWkZtWDZnSHVjTG1V?= =?utf-8?B?TVRSNXByTnV1M3c3NzBvdGtRNnhGV3F1ZHBpNmVIVDgyN1l4QitTM1ZzeFJD?= =?utf-8?B?SE5IMithYTBZclo2QWVUd3lERWJRUVBqQk9aV1pVRzY2bTRSUU9zSit4Qlgy?= =?utf-8?B?NzRjSDBiREZVcld6MU53eDh3T1BBSHp3ZkcxYWdEOWNPZWdVVUN3NFhMSnVU?= =?utf-8?B?elVEcmkyODQxZ1U2MlhpbWNkVG4venViaURrRGxtemtRSVREMDBLdm1Eb25p?= =?utf-8?B?MXdpZmVlVWlwaWxUdEx5UmtUTkZvejlpdXlUcVdZTjJxT21PR3BRR29UaG9G?= =?utf-8?B?SEFkUCtkTElHejZlbUxsUk0zNythblBYbGFMTFBBMFdYcU9iZ282R2Zwcjdn?= =?utf-8?B?dGt6MStaa2hKcVFaYkVlb3FsVDdLWS8wYm0yNjV2TjdpODZoR2UrNzNSZXRS?= =?utf-8?B?QW1RSktWYUFOM05yVnpkN3V1eXJ4ZnFXcGlES1pWRmJKSGc3MHVrUEhkaGhj?= =?utf-8?B?MGpRdTZZcTBGMVA2amVRUUYraXlJNE5aM24vb2ZSUEFXcVppQllmNDVkeCtR?= =?utf-8?B?bTFaZFllUjA1OTVUT0xkdW9nbWl4RmRldnoxZXA5VEFZS3NsL1ZpUTFFbDRq?= =?utf-8?B?NnVyQ1VRZGxYYWltNHhtemtyWlhidzVvcjlzK3F3QmRtclo3dVNEeXRtOGNn?= =?utf-8?B?NHpTMXA0YU1DUDdiTEZhbUxHQlJ4dWp5MVBOaXg1V0tlY1NYZjU0YjdhZUZT?= =?utf-8?B?RTFzb1ZFNDVYazVMZ1ZyL3VFcDJYREN1aVRtNFV6R2t1TUhTY05RK3NFTUV1?= =?utf-8?B?NmdLdHQyVWtsVHlseXFYUW04WjV1Qlg0bStDMHVuOHozbFN2MEltd29KMUtL?= =?utf-8?B?VGxFeFE5SnBRTGgyYkdYYlZKUGVjSnl6TnAraXFJL1JISDZiQ01NTkhoUm90?= =?utf-8?B?Y29DT1o1cW1haVZsbzhuRGNCR29xUSs2amdYMGoyS08xM1dXc1ZPOVplVWsz?= =?utf-8?B?YXBHTFl0MWVnVUxnem9zZk5MdmZITmloaXJLV1JrYlJqSk9ZL1VrRUpjRkc0?= =?utf-8?B?N1NYWWJLNXpoRU5QZU5TVHNhYmVCMXVOVGhBN1Btd3FkOWZjdktxRHczSEZs?= =?utf-8?Q?4n7gWWmgbxY4TTy3Cp9PeSU=3D?= Content-ID: MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN0PR11MB5963.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9caed3a2-545a-4e4c-ae6c-08dc3294185a X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Feb 2024 04:18:02.4351 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 2a1K4pjY9e1W4n/MBIe2zxxDUzdLNzOhL0Y9lUQ3t22yoaNaw5s5ERW2kTsVZZ88i/Y2sJfZs86JP7eXaBOeI56EQQuKGUvr5HSzyHEd/Ww= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR11MB8100 X-OriginatorOrg: intel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240220_201822_204775_B1960611 X-CRM114-Status: GOOD ( 11.61 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, 2024-02-20 at 18:11 -0800, Rick Edgecombe wrote: > Some specific cases that were still open were longjmp()ing off of a > custom userspace threading library stack, which may not have left a > token behind when it jumped to a new stack. And also, potentially off > of an alt shadow stack in the future, depending on whether it leaves > a > restore token when handling a signal. (the problem there, is if there > is no room to leave it). Ah, I remember the other one. If the token on the target shadow stack is at the end of the shadow stack, it may not be able to handle pushing a shadow stack signal frame if a signal hits while is unwinding through the token. As in, where normal longjmp() is direct transition, in this case the longjmp() operation can be temporarily in a place where a signal cannot be handled. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv