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[23.128.96.18]) by mx.google.com with ESMTP id c189si2525557pga.361.2021.05.06.01.27.16; Thu, 06 May 2021 01:27:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233568AbhEFH6s (ORCPT + 99 others); Thu, 6 May 2021 03:58:48 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:28908 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233541AbhEFH6r (ORCPT ); Thu, 6 May 2021 03:58:47 -0400 Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-157-Egn_HFQhOoSF-KNyXXlsnw-1; Thu, 06 May 2021 08:57:46 +0100 X-MC-Unique: Egn_HFQhOoSF-KNyXXlsnw-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 6 May 2021 08:57:44 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.015; Thu, 6 May 2021 08:57:44 +0100 From: David Laight To: 'Linus Torvalds' CC: Josh Poimboeuf , Al Viro , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Will Deacon , Dan Williams , Andrea Arcangeli , "Waiman Long" , Peter Zijlstra , "Thomas Gleixner" , Andrew Cooper , Andy Lutomirski , Christoph Hellwig , "Mark Rutland" , Borislav Petkov Subject: RE: [PATCH v4 3/4] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Topic: [PATCH v4 3/4] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Index: AQHXQWJqu8vqbxm3x0CYXgd0hdGkc6rUkPgwgACVc4CAAPDYwA== Date: Thu, 6 May 2021 07:57:44 +0000 Message-ID: References: <5ba93cdbf35ab40264a9265fc24575a9b2f813b3.1620186182.git.jpoimboe@redhat.com> <2f75c496ac774444b75ff808854b8e5f@AcuMS.aculab.com> In-Reply-To: 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 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMDUgTWF5IDIwMjEgMTk6MzINCj4gDQo+IE9u IFdlZCwgTWF5IDUsIDIwMjEgYXQgMTo0OCBBTSBEYXZpZCBMYWlnaHQgPERhdmlkLkxhaWdodEBh Y3VsYWIuY29tPiB3cm90ZToNCj4gPg0KPiA+IFRoaXMgd291bGQgZXJyb3IgcmVxdWVzdHMgZm9y IGFkZHJlc3MgMCBlYXJsaWVyIC0gYnV0IEkgZG9uJ3QNCj4gPiBiZWxpZXZlIHRoZXkgYXJlIGV2 ZXIgdmFsaWQgaW4gTGludXguDQo+ID4gKFNvbWUgaGlzdG9yaWMgeDg2IGEub3V0IGZvcm1hdHMg ZGlkIGxvYWQgdG8gYWRkcmVzcyAwLikNCj4gDQo+IE5vdCBvbmx5IGxvYWRpbmcgYXQgYWRkcmVz cyAwIC0gdGhlcmUgYXJlIHZhcmlvdXMgcmVhbCByZWFzb24gcyB3aHkNCj4gYWRkcmVzcyAwIG1p Z2h0IGFjdHVhbGx5IGJlIG5lZWRlZC4NCj4gDQo+IEFueWJvZHkgd2hvIHN0aWxsIHJ1bnMgYSAz Mi1iaXQga2VybmVsIGFuZCB3YW50cyB0byB1c2Ugdm04NiBtb2RlLCBmb3INCj4gZXhhbXBsZSwg cmVxdWlyZXMgYWRkcmVzcyAwIGJlY2F1c2UgdGhhdCdzIHNpbXBseSBob3cgdGhlIGhhcmR3YXJl DQo+IHdvcmtzLg0KPiANCj4gU28gbm8uICJtYXNrIHRvIHplcm8gYW5kIG1ha2UgemVybyBpbnZh bGlkIiBpcyBub3QgYSBwcm9wZXIgbW9kZWwuDQoNCkkgaGFkIG15IGRvdWJ0cy4NCkJ1dCBsZXR0 aW5nIHVzZXJzcGFjZSBtYXAgYWRkcmVzcyB6ZXJvIGhhcyBiZWVuIGEgc2VjdXJpdHkgcHJvYmxl bS4NCkl0IGNhbiB0dXJuIGEga2VybmVsIHBhbmljIGludG8gZXhlY3V0aW5nICd1c2VyJyBjb2Rl IHdpdGgNCnN1cGVydmlzb3IgcGVybWlzc2lvbnMuDQoNClNvIEkgZGlkIHdvbmRlciBpZiBpdCBo YWQgYmVlbiBiYW5uZWQgY29tcGxldGVseS4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRk cmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBN SzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==