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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C44C0C43217 for ; Thu, 10 Feb 2022 22:39:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345039AbiBJWjA (ORCPT ); Thu, 10 Feb 2022 17:39:00 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:57636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345032AbiBJWi6 (ORCPT ); Thu, 10 Feb 2022 17:38:58 -0500 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.86.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id F2B7326CD for ; Thu, 10 Feb 2022 14:38:56 -0800 (PST) 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-231-YriZOnoSNKCN8L5w2e2KaA-1; Thu, 10 Feb 2022 22:38:54 +0000 X-MC-Unique: YriZOnoSNKCN8L5w2e2KaA-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 15.0.1497.28; Thu, 10 Feb 2022 22:38:51 +0000 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.028; Thu, 10 Feb 2022 22:38:51 +0000 From: David Laight To: 'Dave Hansen' , Rick Edgecombe , "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 , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V . Shankar" , Dave Martin , Weijiang Yang , "Kirill A . Shutemov" , "joao.moreira@intel.com" , John Allen , "kcc@google.com" , "eranian@google.com" CC: Yu-cheng Yu Subject: RE: [PATCH 18/35] mm: Add guard pages around a shadow stack. Thread-Topic: [PATCH 18/35] mm: Add guard pages around a shadow stack. Thread-Index: AQHYHgPE4ng9s1QFWkGaF1pqJykcg6yNYAXA Date: Thu, 10 Feb 2022 22:38:51 +0000 Message-ID: <1b5d83dc4cd84309823f012a3dce24f0@AcuMS.aculab.com> References: <20220130211838.8382-1-rick.p.edgecombe@intel.com> <20220130211838.8382-19-rick.p.edgecombe@intel.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 RnJvbTogRGF2ZSBIYW5zZW4NCj4gU2VudDogMDkgRmVicnVhcnkgMjAyMiAyMjoyNA0KPiANCj4g T24gMS8zMC8yMiAxMzoxOCwgUmljayBFZGdlY29tYmUgd3JvdGU6DQo+ID4gSU5DU1NQKFEvRCkg aW5jcmVtZW50cyBzaGFkb3cgc3RhY2sgcG9pbnRlciBhbmQgJ3BvcHMgYW5kIGRpc2NhcmRzJyB0 aGUNCj4gPiBmaXJzdCBhbmQgdGhlIGxhc3QgZWxlbWVudHMgaW4gdGhlIHJhbmdlLCBlZmZlY3Rp dmVseSB0b3VjaGVzIHRob3NlIG1lbW9yeQ0KPiA+IGFyZWFzLg0KPiANCj4gVGhpcyBpcyBhIHBy ZXR0eSBjbG9zZSBjb3B5IG9mIHRoZSBpbnN0cnVjdGlvbiByZWZlcmVuY2UgdGV4dCBmb3INCj4g SU5DU1NQLiAgSSdtIGZlZWxpbmcgcmF0aGVyIGRlbnNlIHRvZGF5LCBidXQgdGhhdCdzIGp1c3Qg bm90IG1ha2luZyBhbnkNCj4gc2Vuc2UuDQo+IA0KPiBUaGUgcHNldWRvY29kZSBpcyBtb3JlIHNl bnNpYmxlIGluIHRoZSBTRE0uICBJIHRoaW5rIHRoaXMgbmVlZHMgYSBiZXR0ZXINCj4gZXhwbGFu YXRpb246DQo+IA0KPiAJVGhlIElOQ1NTUCBpbnN0cnVjdGlvbiBpbmNyZW1lbnRzIHRoZSBzaGFk b3cgc3RhY2sgcG9pbnRlci4gIEl0DQo+IAlpcyB0aGUgc2hhZG93IHN0YWNrIGFuYWxvZyBvZiBh biBpbnN0cnVjdGlvbiBsaWtlOg0KPiANCj4gCQlhZGRxCSQweDgwLCAlcnNwDQo+IA0KPiAJSG93 ZXZlciwgdGhlcmUgaXMgb25lIGltcG9ydGFudCBkaWZmZXJlbmNlIGJldHdlZW4gYW4gQUREIG9u DQo+IAklcnNwIGFuZCBJTkNTU1AuICBJbiBhZGRpdGlvbiB0byBtb2RpZnlpbmcgU1NQLCBJTkNT U1AgYWxzbw0KPiAJcmVhZHMgZnJvbSB0aGUgbWVtb3J5IG9mIHRoZSBmaXJzdCBhbmQgbGFzdCBl bGVtZW50cyB0aGF0IHdlcmUNCj4gCSJwb3BwZWQiLiAgWW91IGNhbiB0aGluayBvZiBpdCBhcyBh Y3RpbmcgbGlrZSB0aGlzOg0KPiANCj4gCVJFQURfT05DRShzc3ApOyAgICAgICAvLyByZWFkK2Rp c2NhcmQgdG9wIGVsZW1lbnQgb24gc3RhY2sNCj4gCXNzcCArPSBucl90b19wb3AgKiA4OyAvLyBt b3ZlIHRoZSBzaGFkb3cgc3RhY2sNCj4gCVJFQURfT05DRShzc3AtOCk7ICAgICAvLyByZWFkK2Rp c2NhcmQgbGFzdCBwb3BwZWQgc3RhY2sgZWxlbWVudA0KPiANCj4gDQo+ID4gVGhlIG1heGltdW0g bW92aW5nIGRpc3RhbmNlIGJ5IElOQ1NTUFEgaXMgMjU1ICogOCA9IDIwNDAgYnl0ZXMgYW5kDQo+ ID4gMjU1ICogNCA9IDEwMjAgYnl0ZXMgYnkgSU5DU1NQRC4gIEJvdGggcmFuZ2VzIGFyZSBmYXIg ZnJvbSBQQUdFX1NJWkUuDQo+IA0KPiAuLi4gVGhhdCBtYXhpbXVtIGRpc3RhbmNlLCBjb21iaW5l ZCB3aXRoIGFuIGEgZ3VhcmQgcGFnZXMgYXQgdGhlIGVuZCBvZg0KPiBhIHNoYWRvdyBzdGFjayBl bnN1cmVzIHRoYXQgSU5DU1NQIHdpbGwgZmF1bHQgYmVmb3JlIGl0IGlzIGFibGUgdG8gbW92ZQ0K PiBhY3Jvc3MgYW4gZW50aXJlIGd1YXJkIHBhZ2UuDQo+IA0KPiA+IFRodXMsIHB1dHRpbmcgYSBn YXAgcGFnZSBvbiBib3RoIGVuZHMgb2YgYSBzaGFkb3cgc3RhY2sgcHJldmVudHMgSU5DU1NQLA0K PiA+IENBTEwsIGFuZCBSRVQgZnJvbSBnb2luZyBiZXlvbmQuDQoNCkRvIHlvdSBuZWVkIGEgcmVh bCBndWFyZCBwYWdlPw0KT3IgaXMgaXQganVzdCBlbm91Z2ggdG8gZW5zdXJlIHRoYXQgdGhlIGFk amFjZW50IHBhZ2UgaXNuJ3QgYW5vdGhlcg0Kc2hhZG93IHN0YWNrIHBhZ2U/DQoNCkFueSBvdGhl ciBwYWdlIHdpbGwgY2F1c2UgYSBmYXVsdCBiZWNhdXNlIHRoZSBQVEUgaXNuJ3QgcmVhZG9ubHkr ZGlydHkuDQoNCkknbSBub3Qgc3VyZSBob3cgY29tbW9uIHNpbmdsZSBwYWdlIGFsbG9jYXRlcyBh cmUgaW4gTGludXguDQpCdXQgYWRqYWNlbnQgc2hhZG93IHN0YWNrcyBtYXkgYmUgcmFyZSBhbnl3 YXkuDQpTbyBhIGNoZWNrIGFnYWluc3QgYm90aCBhZGphY2VudCBQVEUgZW50cmllcyB3b3VsZCBz dWZmaWNlLg0KT3IgbWF5YmUgYWx3YXlzIGFsbG9jYXRlIGFuIGV2ZW4gKG9yIG9kZCkgbnVtYmVy ZWQgcGFnZS4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJh bWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0 cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==