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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6582CC433FE for ; Tue, 4 Oct 2022 10:18:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BB9236B0072; Tue, 4 Oct 2022 06:18:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B68D46B0073; Tue, 4 Oct 2022 06:18:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A09216B0074; Tue, 4 Oct 2022 06:18:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 8849A6B0072 for ; Tue, 4 Oct 2022 06:18:04 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 4B9F61A0C55 for ; Tue, 4 Oct 2022 10:18:04 +0000 (UTC) X-FDA: 79982866488.12.49FDB4D Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by imf01.hostedemail.com (Postfix) with ESMTP id A533A40022 for ; Tue, 4 Oct 2022 10:18:03 +0000 (UTC) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-234-vpaXn1vgMYacXBGVntZ1PA-1; Tue, 04 Oct 2022 11:18:00 +0100 X-MC-Unique: vpaXn1vgMYacXBGVntZ1PA-1 Received: from AcuMS.Aculab.com (10.202.163.6) by AcuMS.aculab.com (10.202.163.6) with Microsoft SMTP Server (TLS) id 15.0.1497.38; Tue, 4 Oct 2022 11:17:57 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.040; Tue, 4 Oct 2022 11:17:57 +0100 From: David Laight To: 'Dave Hansen' , Kees Cook , Rick Edgecombe CC: "x86@kernel.org" , "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-mm@kvack.org" , "linux-arch@vger.kernel.org" , "linux-api@vger.kernel.org" , Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , "Jann Horn" , Jonathan Corbet , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V . Shankar" , Weijiang Yang , "Kirill A . Shutemov" , "joao.moreira@intel.com" , John Allen , "kcc@google.com" , "eranian@google.com" , "rppt@kernel.org" , "jamorris@linux.microsoft.com" , "dethoma@microsoft.com" , Yu-cheng Yu Subject: RE: [PATCH v2 24/39] x86/cet/shstk: Add user-mode shadow stack support Thread-Topic: [PATCH v2 24/39] x86/cet/shstk: Add user-mode shadow stack support Thread-Index: AQHY12Njz3/HZpf9jkaO+WwIiUYgJ63+BXng Date: Tue, 4 Oct 2022 10:17:57 +0000 Message-ID: <4b9c6208d1174c27a795cef487eb97b5@AcuMS.aculab.com> References: <20220929222936.14584-1-rick.p.edgecombe@intel.com> <20220929222936.14584-25-rick.p.edgecombe@intel.com> <202210031203.EB0DC0B7DD@keescook> <474d3aca-0cf0-8962-432b-77ac914cc563@intel.com> In-Reply-To: <474d3aca-0cf0-8962-432b-77ac914cc563@intel.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1664878683; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=w3AIO9u3vqmUmJuksH/Ot+qudaWIa2qF4AyKn8NrEqY=; b=KyKoAT9vlCe4cBnPYvgufv/x1X5F4/L1SBTxAn0wB68scyvqZXIiI4cJtsxORMZtlt+mdR LfwDBOAEooXwXz/koKrucP69M/VwbLxRcPWzBDM/DqRvRO7/wKDubTcI7ViwFpNrnWbzqu Etx7lubSYXfp63C5XauHszg3mI1rKOk= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=aculab.com; spf=pass (imf01.hostedemail.com: domain of david.laight@aculab.com designates 185.58.85.151 as permitted sender) smtp.mailfrom=david.laight@aculab.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1664878683; a=rsa-sha256; cv=none; b=Xlc4GyoRQZhMXHeQ1v12odNfWZRyiKLAkk7WECdOx07aOZBOJe0PqLwvHI9UoCcFSgyDEI BiwaoVURNRkxqYvDPTFYOhscdAxrAnx3iTNChAUfrqW1kPxOEVEx2/zfBd0FhP5uskW7x0 /4BMe52IqFsQ9CQhwTrbBkG+Dv3DhkY= X-Stat-Signature: mi4kthb4xyf7pgh6s35rscopt18b75ud X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: A533A40022 Authentication-Results: imf01.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=aculab.com; spf=pass (imf01.hostedemail.com: domain of david.laight@aculab.com designates 185.58.85.151 as permitted sender) smtp.mailfrom=david.laight@aculab.com X-Rspam-User: X-HE-Tag: 1664878683-872509 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: RnJvbTogRGF2ZSBIYW5zZW4NCj4gU2VudDogMDMgT2N0b2JlciAyMDIyIDIxOjA1DQo+IA0KPiBP biAxMC8zLzIyIDEyOjQzLCBLZWVzIENvb2sgd3JvdGU6DQo+ID4+ICtzdGF0aWMgaW5saW5lIHZv aWQgc2V0X2Nscl9iaXRzX21zcmwodTMyIG1zciwgdTY0IHNldCwgdTY0IGNsZWFyKQ0KPiA+PiAr ew0KPiA+PiArCXU2NCB2YWwsIG5ld192YWw7DQo+ID4+ICsNCj4gPj4gKwlyZG1zcmwobXNyLCB2 YWwpOw0KPiA+PiArCW5ld192YWwgPSAodmFsICYgfmNsZWFyKSB8IHNldDsNCj4gPj4gKw0KPiA+ PiArCWlmIChuZXdfdmFsICE9IHZhbCkNCj4gPj4gKwkJd3Jtc3JsKG1zciwgbmV3X3ZhbCk7DQo+ ID4+ICt9DQo+ID4gSSBhbHdheXMgZ2V0IHVuY29tZm9ydGFibGUgd2hlbiBJIHNlZSB0aGVzZSBr aW5kcyBvZiBnZW5lcmFsaXplZCBoZWxwZXINCj4gPiBmdW5jdGlvbnMgZm9yIHRvdWNoaW5nIGNw dSBiaXRzLCBldGMuIEl0IGp1c3QgYmVncyBmb3IgZnV0dXJlIGF0dGFja2VyDQo+ID4gYWJ1c2Ug dG8gbXVjayB3aXRoIGFyYml0cmFyeSBiaXRzIC0tIGV2ZW4gbWFya2VkIGlubGluZSB0aGVyZSBp cyBhIHJpc2sNCj4gPiB0aGUgY29tcGlsZXIgd2lsbCBpZ25vcmUgdGhhdCBpbiBzb21lIGNpcmN1 bXN0YW5jZXMgKG5vdCBhcyBjdXJyZW50bHkNCj4gPiB1c2VkIGluIHRoZSBjb2RlLCBidXQgSSdt IGltYWdpbmluZyBmdXR1cmUgY2hhbmdlcyBsZWFkaW5nIHRvIHN1Y2ggYQ0KPiA+IGNvbmRpdGlv bikuIFdpbGwgeW91IGh1bW9yIG1lIGFuZCBjaGFuZ2UgdGhpcyB0byBhIG1hY3JvIGluc3RlYWQ/ IFRoYXQnbGwNCj4gPiBmb3JjZSBpdCBhbHdheXMgaW5saW5lIChldmVuIF9fYWx3YXlzX2lubGlu ZSBpc24ndCBhbHdheXMgaW5saW5lKToNCj4gDQo+IE9oLCBhcmUgeW91IHRoaW5raW5nIHRoYXQg dGhpcyBpcyBkYW5nZXJvdXMgYmVjYXVzZSBpdCdzIHNvIHN1cmdpY2FsIGFuZA0KPiBub24taW50 cnVzaXZlPyAgSXQncyBldmVuIG1vcmUgcG93ZXJmdWwgdG8gYW4gYXR0YWNrZXIgdGhhbiwgc2F5 DQo+IHdybXNybCgpLCBiZWNhdXNlIHRoZXJlIHRoZXkgYWN0dWFsbHkgaGF2ZSB0byBrbm93IHdo YXQgdGhlIGV4aXN0aW5nDQo+IHZhbHVlIGlzIHRvIHVwZGF0ZSBpdC4gIFdpdGggdGhpcyBoZWxw ZXIsIGl0J3MgcXVpdGUgZWFzeSB0byBmbGlwIGFuDQo+IGluZGl2aWR1YWwgYml0IHdpdGhvdXQg ZGlzdHVyYmluZyB0aGUgbmVpZ2hib3JpbmcgYml0cy4NCj4gDQo+IElzIHRoYXQgaXQ/DQo+IA0K PiBJIGRvbid0IF9saWtlXyB0aGUgI2RlZmluZXMsIGJ1dCBkb2luZyBvbmUgaGVyZSBkb2Vzbid0 IHNlZW0gdG9vIG9uZXJvdXMNCj4gY29uc2lkZXJpbmcgaG93IGNyaXRpY2FsIE1TUnMgYXJlLg0K DQpIb3cgb2Z0ZW4gaXMgdGhlICdtc3InIG51bWJlciBub3QgYSBjb21waWxlLXRpbWUgY29uc3Rh bnQ/DQpBZGRpbmcgcmQvd3Jtc3IgdmFyaWFudHMgdGhhdCB2ZXJpZnkgdGhpcyB3b3VsZCByZWR1 Y2UgdGhlDQphdHRhY2sgc3VyZmFjZSBhcyB3ZWxsLg0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJl ZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXlu ZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K