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=-3.8 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 D2E3FC43461 for ; Wed, 9 Sep 2020 16:17:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A76AD207DE for ; Wed, 9 Sep 2020 16:17:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730785AbgIIQRj (ORCPT ); Wed, 9 Sep 2020 12:17:39 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:44580 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730869AbgIIQNW (ORCPT ); Wed, 9 Sep 2020 12:13:22 -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-76-XSFyfqTsNyGFTHt7WN8sQQ-1; Wed, 09 Sep 2020 14:46:24 +0100 X-MC-Unique: XSFyfqTsNyGFTHt7WN8sQQ-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; Wed, 9 Sep 2020 14:46:24 +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; Wed, 9 Sep 2020 14:46:24 +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 , Mark Rutland Subject: RE: [PATCH v2] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Topic: [PATCH v2] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Index: AQHWhgeZBzEzlDBqrkarsC8PutwJjalf9DHAgAA9hwCAACE/UA== Date: Wed, 9 Sep 2020 13:46:24 +0000 Message-ID: <26e7028623624b7db6d4e39875274933@AcuMS.aculab.com> References: <20200908174329.ryfprry62e4tuodw@treble> <01b027d0d46d4572b3b16e2b49f0f2b3@AcuMS.aculab.com> <20200909124644.dndmfnoob5qzd7xi@treble> In-Reply-To: <20200909124644.dndmfnoob5qzd7xi@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: 0.001 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 RnJvbTogSm9zaCBQb2ltYm9ldWYNCj4gU2VudDogMDkgU2VwdGVtYmVyIDIwMjAgMTM6NDcNCj4g T24gV2VkLCBTZXAgMDksIDIwMjAgYXQgMDg6MjA6MDdBTSArMDAwMCwgRGF2aWQgTGFpZ2h0IHdy b3RlOg0KPiA+IEZyb206IEpvc2ggUG9pbWJvZXVmIDxqcG9pbWJvZUByZWRoYXQuY29tPg0KPiA+ ID4gU2VudDogMDggU2VwdGVtYmVyIDIwMjAgMTg6NDMNCj4gPiA+IEhpIHg4NiBtYWludGFpbmVy cywNCj4gPiAuLi4NCj4gPiA+ID4gLS0tIGEvYXJjaC94ODYvbGliL3B1dHVzZXIuUw0KPiA+ID4g PiArKysgYi9hcmNoL3g4Ni9saWIvcHV0dXNlci5TDQo+ID4gPiA+IEBAIC0zOCw2ICszOCw4IEBA IFNZTV9GVU5DX1NUQVJUKF9fcHV0X3VzZXJfMSkNCj4gPiA+ID4gIAlFTlRFUg0KPiA+ID4gPiAg CWNtcCBUQVNLX2FkZHJfbGltaXQoJV9BU01fQlgpLCVfQVNNX0NYDQo+ID4gPiA+ICAJamFlIC5M YmFkX3B1dF91c2VyDQo+ID4gPiA+ICsJc2JiICVfQVNNX0JYLCAlX0FTTV9CWAkJLyogdWFjY2Vz c19tYXNrX3B0cigpICovDQo+ID4gPiA+ICsJYW5kICVfQVNNX0JYLCAlX0FTTV9DWA0KPiA+ID4g PiAgCUFTTV9TVEFDDQo+ID4gPiA+ICAxOgltb3ZiICVhbCwoJV9BU01fQ1gpDQo+ID4gPiA+ICAJ eG9yICVlYXgsJWVheA0KPiA+DQo+ID4gRm9yIDY0Yml0IHRoZSBzYmIrYW5kIHBhdHRlcm4gY2Fu IGJlIHJlcGxhY2VkIGJ5IGFuIGluc3RydWN0aW9uDQo+ID4gdGhhdCBjbGVhcnMgdGhlIGhpZ2gg Yml0IChlZyBidHIgJDYzLCAlcmN4KS4NCj4gPiBUaGlzIGlzbid0IGRlcGVuZGFudCBvbiB0aGUg ZWFybGllciBpbnN0cnVjdGlvbnMgc28gY2FuIGV4ZWN1dGUNCj4gPiBpbiBwYXJhbGxlbCB3aXRo IHRoZW0uDQo+IA0KPiBXb3VsZG4ndCB0aGF0IGJyZWFrIHdpdGggS0VSTkVMX0RTPw0KDQpJIHRo aW5rIHRoYXQgaGFzIGFscmVhZHkgYWxsIGJlZW4gcmVtb3ZlZCBmcm9tIHg4Ni4NCg0KCURhdmlk DQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBG YXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2 IChXYWxlcykNCg==