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 E4B0BC433F5 for ; Fri, 11 Feb 2022 09:08:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348348AbiBKJIz (ORCPT ); Fri, 11 Feb 2022 04:08:55 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:52424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242898AbiBKJIw (ORCPT ); Fri, 11 Feb 2022 04:08:52 -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 C4F471021 for ; Fri, 11 Feb 2022 01:08:50 -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-91-XP-PeTqnNb6M-AeFx-qu4A-1; Fri, 11 Feb 2022 09:08:48 +0000 X-MC-Unique: XP-PeTqnNb6M-AeFx-qu4A-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; Fri, 11 Feb 2022 09:08:45 +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; Fri, 11 Feb 2022 09:08:45 +0000 From: David Laight To: "'Edgecombe, Rick P'" , "Shankar, Ravi V" , "bsingharora@gmail.com" , "hpa@zytor.com" , "Syromiatnikov, Eugene" , "peterz@infradead.org" , "rdunlap@infradead.org" , "keescook@chromium.org" , "dave.hansen@linux.intel.com" , "kirill.shutemov@linux.intel.com" , "Eranian, Stephane" , "linux-mm@kvack.org" , "fweimer@redhat.com" , "nadav.amit@gmail.com" , "jannh@google.com" , "linux-arch@vger.kernel.org" , "kcc@google.com" , "pavel@ucw.cz" , "oleg@redhat.com" , "hjl.tools@gmail.com" , "bp@alien8.de" , "Lutomirski, Andy" , "arnd@arndb.de" , "Moreira, Joao" , "tglx@linutronix.de" , "mike.kravetz@oracle.com" , "x86@kernel.org" , "linux-doc@vger.kernel.org" , "Dave.Martin@arm.com" , "Yang, Weijiang" , "john.allen@amd.com" , "mingo@redhat.com" , "Hansen, Dave" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , "gorcunov@gmail.com" CC: "Yu, Yu-cheng" 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: AQHYHgPE4ng9s1QFWkGaF1pqJykcg6yNYAXAgAATt4CAAJxvEA== Date: Fri, 11 Feb 2022 09:08:45 +0000 Message-ID: <09ed01cc5e564ef78875b18001955bb1@AcuMS.aculab.com> References: <20220130211838.8382-1-rick.p.edgecombe@intel.com> <20220130211838.8382-19-rick.p.edgecombe@intel.com> <1b5d83dc4cd84309823f012a3dce24f0@AcuMS.aculab.com> <6a4c11e506874293df13cb94b9dd578bba1819d7.camel@intel.com> In-Reply-To: <6a4c11e506874293df13cb94b9dd578bba1819d7.camel@intel.com> 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 RnJvbTogRWRnZWNvbWJlLCBSaWNrIFANCj4gU2VudDogMTAgRmVicnVhcnkgMjAyMiAyMzo0Mw0K PiANCj4gT24gVGh1LCAyMDIyLTAyLTEwIGF0IDIyOjM4ICswMDAwLCBEYXZpZCBMYWlnaHQgd3Jv dGU6DQo+ID4gRG8geW91IG5lZWQgYSByZWFsIGd1YXJkIHBhZ2U/DQo+ID4gT3IgaXMgaXQganVz dCBlbm91Z2ggdG8gZW5zdXJlIHRoYXQgdGhlIGFkamFjZW50IHBhZ2UgaXNuJ3QgYW5vdGhlcg0K PiA+IHNoYWRvdyBzdGFjayBwYWdlPw0KPiA+DQo+ID4gQW55IG90aGVyIHBhZ2Ugd2lsbCBjYXVz ZSBhIGZhdWx0IGJlY2F1c2UgdGhlIFBURSBpc24ndA0KPiA+IHJlYWRvbmx5K2RpcnR5Lg0KPiA+ DQo+ID4gSSdtIG5vdCBzdXJlIGhvdyBjb21tb24gc2luZ2xlIHBhZ2UgYWxsb2NhdGVzIGFyZSBp biBMaW51eC4NCj4gDQo+IEkgdGhpbmsgaXQgY2FtZSBmcm9tIHRoaXMgZGlzY3Vzc2lvbjoNCj4g DQo+IGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL2xrbWwvQ0FHNDhlejF5dE9mUXlOWk1OUEZwN1hx S2NwZDdfYVJhaTlHNXM3cngwVj04WkcrcjJBQG1haWwuZ21haWwuY29tLyN0DQo+IA0KPiA+IEJ1 dCBhZGphY2VudCBzaGFkb3cgc3RhY2tzIG1heSBiZSByYXJlIGFueXdheS4NCj4gPiBTbyBhIGNo ZWNrIGFnYWluc3QgYm90aCBhZGphY2VudCBQVEUgZW50cmllcyB3b3VsZCBzdWZmaWNlLg0KPiA+ IE9yIG1heWJlIGFsd2F5cyBhbGxvY2F0ZSBhbiBldmVuIChvciBvZGQpIG51bWJlcmVkIHBhZ2Uu DQo+IA0KPiBJdCBqdXN0IG5lZWRzIHRvIG5vdCBiZSBhZGphY2VudCB0byBzaGFkb3cgc3RhY2sg bWVtb3J5IHRvIGRvIHRoZSBqb2IuDQo+IFdvdWxkIHRoYXQgYmUgc21hbGwgdG8gaW1wbGVtZW50 PyBJdCBtaWdodCBiZSBhIHRyYWRlb2ZmIG9mIGNvZGUNCj4gY29tcGxleGl0eS4NCg0KVGhhdCdz IHdoYXQgSSB0aG91Z2h0Lg0KQWx0aG91Z2ggdGhlIFZBIHVzZSBmb3IgZ3VhcmQgcGFnZXMgbWln aHQgYmUgYSBwcm9ibGVtIGluIGl0c2VsZi4NCg0KSSdtIG5vdCBzdXJlIHdoeSBJIHRob3VnaHQg c2hhZG93IHN0YWNrcyB3b3VsZCBiZSBhIHNpbmdsZSBwYWdlLg0KRm9yIHVzZXIgc3BhY2UgdGhh dCAnb25seScgYWxsb3dzIDUxMiBjYWxscy4NCkZvciBrZXJuZWwgaXQgaXMgYSBtYXNzaXZlIHdh c3RlIG9mIG1lbW9yeS4NCkl0IGlzIHByb2JhYmx5IHdvcnRoIHB1dHRpbmcgbXVsdGlwbGUga2Vy bmVsIHNoYWRvdyBzdGFja3MgaW50byB0aGUgc2FtZSBwYWdlLg0KKENvZGUgdGhhdCBjYW4gb3Zl cnJ1biBjYW4gZG8gb3RoZXIgc3R1ZmYgbW9yZSBlYXNpbHkuKQ0KDQpUaGUgaGFyZHdhcmUgZW5n aW5lZXJzIGZhaWxlZCB0byB0aGluayBhYm91dCB0aGUgaW1wbGVtZW50YXRpb24gKGFnYWluKS4N ClRoZSBzaGFkb3cgc3RhY2sgc2hvdWxkIChwcm9iYWJseSkgcnVuIGluIHRoZSBvcHBvc2l0ZSBk aXJlY3Rpb24gdG8NCnRoZSBub3JtYWwgc3RhY2suDQpUaGVuIHRoZSBzaGFkb3cgc3RhY2sgY2Fu IGJlIHBsYWNlZCBhdCB0aGUgb3RoZXIgZW5kIG9mIHRoZSBWQSBhbGxvY2F0ZWQNCnRvIGEgdXNl ciBzcGFjZSBzdGFjay4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lk ZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0K UmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==