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 46683C43461 for ; Tue, 15 Sep 2020 08:23:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D90B20771 for ; Tue, 15 Sep 2020 08:23:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726214AbgIOIXT (ORCPT ); Tue, 15 Sep 2020 04:23:19 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:32355 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726178AbgIOIWz (ORCPT ); Tue, 15 Sep 2020 04:22:55 -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-71-5leh59vyMUmzAnr2F172FA-1; Tue, 15 Sep 2020 09:22:50 +0100 X-MC-Unique: 5leh59vyMUmzAnr2F172FA-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, 15 Sep 2020 09:22:49 +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, 15 Sep 2020 09:22:49 +0100 From: David Laight To: 'Josh Poimboeuf' CC: 'Borislav Petkov' , "x86@kernel.org" , "Al Viro" , "linux-kernel@vger.kernel.org" , Linus Torvalds , Will Deacon , Dan Williams , Andrea Arcangeli , "Waiman Long" , Peter Zijlstra , "Thomas Gleixner" , Andrew Cooper , Andy Lutomirski , Christoph Hellwig , "Mark Rutland" Subject: RE: [PATCH v3] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Topic: [PATCH v3] x86/uaccess: Use pointer masking to limit uaccess speculation Thread-Index: AQHWisBV61WRef5OMEyULIupnNS1CKloouig///5HACAAMAeUA== Date: Tue, 15 Sep 2020 08:22:49 +0000 Message-ID: <18cc6ae97e1f4bf5a81167e0c1313935@AcuMS.aculab.com> References: <1d06ed6485b66b9f674900368b63d7ef79f666ca.1599756789.git.jpoimboe@redhat.com> <20200914175604.GF680@zn.tnic> <2e6a4d75b38248f1b8b3b874d36065f1@AcuMS.aculab.com> <20200914215104.cjvycgie2wd3omtn@treble> In-Reply-To: <20200914215104.cjvycgie2wd3omtn@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 RnJvbTogSm9zaCBQb2ltYm9ldWYNCj4gU2VudDogMTQgU2VwdGVtYmVyIDIwMjAgMjI6NTENCj4g DQo+IE9uIE1vbiwgU2VwIDE0LCAyMDIwIGF0IDA5OjIzOjU5UE0gKzAwMDAsIERhdmlkIExhaWdo dCB3cm90ZToNCj4gPiBGcm9tOiBCb3Jpc2xhdiBQZXRrb3YNCj4gPiA+IFNlbnQ6IDE0IFNlcHRl bWJlciAyMDIwIDE4OjU2DQo+ID4gPg0KPiA+ID4gT24gVGh1LCBTZXAgMTAsIDIwMjAgYXQgMTI6 MjI6NTNQTSAtMDUwMCwgSm9zaCBQb2ltYm9ldWYgd3JvdGU6DQo+ID4gPiA+ICsvKg0KPiA+ID4g PiArICogU2FuaXRpemUgYSB1c2VyIHBvaW50ZXIgc3VjaCB0aGF0IGl0IGJlY29tZXMgTlVMTCBp ZiBpdCdzIG5vdCBhIHZhbGlkIHVzZXINCj4gPiA+ID4gKyAqIHBvaW50ZXIuICBUaGlzIHByZXZl bnRzIHNwZWN1bGF0aXZlIGRlcmVmZXJlbmNlcyBvZiB1c2VyLWNvbnRyb2xsZWQgcG9pbnRlcnMN Cj4gPiA+ID4gKyAqIHRvIGtlcm5lbCBzcGFjZSB3aGVuIGFjY2Vzc19vaygpIHNwZWN1bGF0aXZl bHkgcmV0dXJucyB0cnVlLiAgVGhpcyBzaG91bGQgYmUNCj4gPiA+ID4gKyAqIGRvbmUgKmFmdGVy KiBhY2Nlc3Nfb2soKSwgdG8gYXZvaWQgYWZmZWN0aW5nIGVycm9yIGhhbmRsaW5nIGJlaGF2aW9y Lg0KPiA+ID4NCj4gPiA+IEVyciwgc3R1cGlkIHF1ZXN0aW9uOiBjYW4gdGhpcyBtYWNybyB0aGVu IGJlIGZvbGRlZCBpbnRvIGFjY2Vzc19vaygpIHNvDQo+ID4gPiB0aGF0IHlvdSBkb24ndCBoYXZl IHRvIHRvdWNoIHNvIG1hbnkgcGxhY2VzIGFuZCB0aGUgY2hlY2sgY2FuIGhhcHBlbg0KPiA+ID4g YXV0b21hdGljYWxseT8NCj4gPg0KPiA+IE15IHRob3VnaHRzIGFyZSB0aGF0IGFjY2Vzc19vaygp IGNvdWxkIHJldHVybiAwIGZvciBmYWlsIGFuZCB+MHUNCj4gPiBmb3Igc3VjY2Vzcy4NCj4gPiBZ b3UgY291bGQgdGhlbiBkbyAod2l0aCBhIGZldyBjYXN0cyk6DQo+ID4gCW1hc2sgPSBhY2Nlc3Nf b2socHRyLCBzaXplKTsNCj4gPiAJLyogU3RvcCBnY2MgdHJhY2tpbmcgdGhlIHZhbHVlIG9mIG1h c2suICovDQo+ID4gCWFzbSB2b2xhdGlsZSggIiIgOiAiK3IiIChtYXNrKSk7DQo+ID4gCWFkZHIg PSBwdHIgJiBtYXNrOw0KPiA+IAlpZiAoIWFkZHIgJiYgcHRyKSAgLy8gTGV0IE5VTEwgdGhyb3Vn aD8/DQo+ID4gCQlyZXR1cm4gLUVGQVVMVDsNCj4gPg0KPiA+IEkgdGhpbmsgdGhlcmUgYXJlIG90 aGVyIGNoYW5nZXMgaW4gdGhlIHBpcGVsaW5lIHRvIHJlbW92ZQ0KPiA+IG1vc3Qgb2YgdGhlIGFj Y2Vzc19vaygpIGFwYXJ0IGZyb20gdGhvc2UgaW5zaWRlIHB1dC9nZXRfdXNlcigpDQo+ID4gYW5k IGNvcHlfdG8vZnJvbV91c2VyKCkuDQo+ID4gU28gdGhlIGNoYW5nZXMgc2hvdWxkIGJlIG1vcmUg bGltaXRlZCB0aGFuIHlvdSBtaWdodCB0aGluay4NCj4gDQo+IE1heWJlLCBidXQgSSBiZWxpZXZl IHRoYXQncyBzdGlsbCBnb2luZyB0byBlbmQgdXAgYSB0cmVld2lkZSBjaGFuZ2UuDQo+IA0KPiBB bmQsIGlmIHdlJ3JlIGdvaW5nIHRvIHRoZSB0cm91YmxlIG9mIGNoYW5naW5nIHRoZSBhY2Nlc3Nf b2soKQ0KPiBpbnRlcmZhY2UsIHdlIHNob3VsZCBjaGFuZ2UgaXQgZW5vdWdoIHRvIG1ha2Ugc3Vy ZSB0aGF0IGFjY2lkZW50YWwgdXNlcw0KPiBvZiB0aGUgb2xkIGludGVyZmFjZSAoYWZ0ZXIgeWVh cnMgb2YgbXVzY2xlIG1lbW9yeSkgd2lsbCBmYWlsIHRvIGJ1aWxkLg0KPiANCj4gV2UgY291bGQg ZWl0aGVyIGFkZCBhIDNyZCBhcmd1bWVudCwgb3IgcmVuYW1lIGl0IHRvIGFjY2Vzc19va19tYXNr KCkgb3INCj4gc29tZXRoaW5nLg0KDQpJdCB3b3VsZCB0YWtlIHNvbWUgdGhvdWdodCB0byBnZXQg cmlnaHQgKGFuZCBmb29sIHByb29mKSBzbyB3b3VsZCBuZWVkDQpuZXcgbmFtZXMgc28gaXQgY291 bGQgY28tZXhpc3Qgd2l0aCB0aGUgZXhpc3RpbmcgY29kZSBzbyB0aGF0IHRoZQ0KY2hhbmdlcyBj b3VsZCAncmlwcGxlIHRocm91Z2gnIHRoZSBzb3VyY2UgdHJlZSBpbnN0ZWFkIG9mIGFsbCBoYXZp bmcgdG8NCmJlIG1hZGUgYXQgb25jZS4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVz cyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEg MVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==