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=-4.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 B6E89C433E7 for ; Tue, 1 Sep 2020 15:01:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B957206CD for ; Tue, 1 Sep 2020 15:01:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728116AbgIAPA7 (ORCPT ); Tue, 1 Sep 2020 11:00:59 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:42760 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726594AbgIAPAt (ORCPT ); Tue, 1 Sep 2020 11:00:49 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-43-fL2nrNnkO5KgEa_XAJpc8A-1; Tue, 01 Sep 2020 16:00:45 +0100 X-MC-Unique: fL2nrNnkO5KgEa_XAJpc8A-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 1 Sep 2020 16:00:44 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Tue, 1 Sep 2020 16:00:44 +0100 From: David Laight To: 'Josh Poimboeuf' CC: "'x86@kernel.org'" , "'linux-kernel@vger.kernel.org'" , 'Linus Torvalds' , 'Al Viro' , "'Will Deacon'" , 'Dan Williams' , "'Andrea Arcangeli'" , 'Waiman Long' , "'Peter Zijlstra'" , 'Thomas Gleixner' , 'Andrew Cooper' , 'Andy Lutomirski' , 'Christoph Hellwig' Subject: RE: [PATCH] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Topic: [PATCH] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Index: AQHWfXGL4X8nWl6IwEyifUSeZx09HqlPCNzQgABwecCAAvQOAIABC1NggABTgICAABk0IA== Date: Tue, 1 Sep 2020 15:00:44 +0000 Message-ID: <0e91076ecda04055859b3ec32f8493ba@AcuMS.aculab.com> References: <20200828192911.ezqspexfb2gtvrr7@treble> <56488b800d044a7e81efd8b40198a527@AcuMS.aculab.com> <20200831173112.fjfnnup5cfc5t226@treble> <93873def6ede46f89fa33b3fc78876f6@AcuMS.aculab.com> <20200901142651.eir5nx4gpy63shlm@treble> In-Reply-To: <20200901142651.eir5nx4gpy63shlm@treble> 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 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: aculab.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogSm9zaCBQb2ltYm9ldWYNCj4gU2VudDogMDEgU2VwdGVtYmVyIDIwMjAgMTU6MjcNCj4g DQo+IE9uIFR1ZSwgU2VwIDAxLCAyMDIwIGF0IDA4OjMyOjIwQU0gKzAwMDAsIERhdmlkIExhaWdo dCB3cm90ZToNCj4gPiA+IFllcywgaXQgd291bGQgbWFrZSBzZW5zZSB0byBwdXQgdGhlIG1hc2tp bmcgaW4gYWNjZXNzX29rKCkgc29tZWhvdy4gIEJ1dA0KPiA+ID4gdG8gZG8gaXQgcHJvcGVybHks IEkgdGhpbmsgd2UnZCBmaXJzdCBuZWVkIHRvIG1ha2UgYWNjZXNzX29rKCkgZ2VuZXJpYy4NCj4g PiA+IE1heWJlIHRoYXQncyBkby1hYmxlLCBidXQgaXQgd291bGQgYmUgYSBtdWNoIGJpZ2dlciBw YXRjaCBzZXQuDQo+ID4gPg0KPiA+ID4gRmlyc3QgSSdkIHByZWZlciB0byBqdXN0IGZpeCB4ODYs IGxpa2UgbXkgcGF0Y2ggZG9lcy4gIFRoZW4gd2UgY291bGQgZG8NCj4gPiA+IGFuIGFjY2Vzc19v aygpIHJld29yay4NCj4gPg0KPiA+IElmIHlvdSBkbyBhIG1vZGlmaWVkIGFjY2Vzc19vaygpIHlv dSBnZXQgdG8gKHNsb3dseSkgY29sbGVjdCBhbGwNCj4gPiB0aGUgaW1wb3J0YW50IHBhdGhzLg0K PiA+IE5vIHBvaW50IHJlcGxpY2F0aW5nIHRoZSBzYW1lIHRlc3QuDQo+ID4NCj4gPiBBIGxvdCBv ZiB0aGUgYWNjZXNzX29rKCkgY2FuIGJlIGRlbGV0ZWQgLSBtYXliZSByZW1vdmUgc29tZSBfXw0K PiA+IGZyb20gdGhlIGZvbGxvd2luZyBmdW5jdGlvbnMuDQo+ID4gT3IgY2hhbmdlIHRvIHRoZSB2 YXJpYW50cyB0aGF0IGVuYWJsZSB1c2VyLXNwYWNlIGFjY2Vzc2VzLg0KPiANCj4gV2VsbCwgeWVz LCBidXQgdGhhdCdzIGEgbXVjaCBiaWdnZXIgam9iIHdoaWNoIGNhbiBiZSBkb25lIGxhdGVyLg0K DQpJc24ndCB0aGlzIGFsbCByYXRoZXIgZGlmZmljdWx0IHRvIGV4cGxvaXQgdGhvdWdoPw0KKFVu bGlrZSB0aGUgb3JpZ2luYWwgU3BlY3RyZSB3aGljaCB0cml2aWFsbHkgbGV0IGtlcm5lbA0KbWVt b3J5IGJlIHJlYWQuKQ0KRG9uJ3QgeW91IG5lZWQgdG8gbWFuYWdlIHRvICdwcmVzZXQnIHRoZSBi cmFuY2ggcHJlZGljdG9yIGFuZCBCVEINCnRvIHRoZSByaWdodCBzdGF0ZSBhbmQgdGhlbiBtYW5h Z2Ugc29tZSBraW5kIG9mIHRpbWluZyBhdHRhY2sNCm9uIEwxIGNhY2hlPw0KDQoJRGF2aWQNCg0K LQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0s IE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdh bGVzKQ0K