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[23.128.96.18]) by mx.google.com with ESMTP id y19si503185edd.425.2021.08.20.08.47.54; Fri, 20 Aug 2021 08:48:18 -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 S241152AbhHTPq4 (ORCPT + 99 others); Fri, 20 Aug 2021 11:46:56 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.85.151]:53095 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240966AbhHTPqw (ORCPT ); Fri, 20 Aug 2021 11:46:52 -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-88-F1DQbSqpMu6M5LHnyNb7xg-1; Fri, 20 Aug 2021 16:46:12 +0100 X-MC-Unique: F1DQbSqpMu6M5LHnyNb7xg-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 15.0.1497.23; Fri, 20 Aug 2021 16:46:11 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.023; Fri, 20 Aug 2021 16:46:11 +0100 From: David Laight To: 'Ard Biesheuvel' , Joerg Roedel CC: "x86@kernel.org" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "hpa@zytor.com" , Joerg Roedel , Kees Cook , Andy Lutomirski , Uros Bizjak , Arvind Sankar , "linux-kernel@vger.kernel.org" , Fabio Aiuto , "stable@vger.kernel.org" Subject: RE: [PATCH] x86/efi: Restore Firmware IDT in before ExitBootServices() Thread-Topic: [PATCH] x86/efi: Restore Firmware IDT in before ExitBootServices() Thread-Index: AQHXlZXa+jtHdymQB0W1fhKjcUB7Wqt8EPPg///0gwCAABNdkIAAKfIdgABE/BA= Date: Fri, 20 Aug 2021 15:46:11 +0000 Message-ID: References: <20210820073429.19457-1-joro@8bytes.org> 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 RnJvbTogQXJkIEJpZXNoZXV2ZWwNCj4gU2VudDogMjAgQXVndXN0IDIwMjEgMTI6MzINCj4gDQo+ IE9uIEZyaSwgMjAgQXVnIDIwMjEgYXQgMTI6MTksIEpvZXJnIFJvZWRlbCA8am9yb0A4Ynl0ZXMu b3JnPiB3cm90ZToNCj4gPg0KPiA+IE9uIEZyaSwgQXVnIDIwLCAyMDIxIGF0IDA5OjAyOjQ2QU0g KzAwMDAsIERhdmlkIExhaWdodCB3cm90ZToNCj4gPiA+IFNvIGFsbG9jYXRlIGFuZCBpbml0aWFs aXNlIHRoZSBMaW51eCBJRFQgLSBzbyBlbnRyaWVzIGNhbiBiZSBhZGRlZC4NCj4gPiA+IEJ1dCBk b24ndCBleGVjdXRlICdsaWR0JyB1bnRpbCBsYXRlciBvbi4NCj4gPg0KPiA+IFRoZSBJRFQgaXMg bmVlZGVkIGluIHRoaXMgcGF0aCB0byBoYW5kbGUgI1ZDIGV4Y2VwdGlvbnMgY2F1c2VkIGJ5IENQ VUlEDQo+ID4gaW5zdHJ1Y3Rpb25zLiBTbyBsb2FkaW5nIHRoZSBJRFQgbGF0ZXIgaXMgbm90IGFu IG9wdGlvbi4NCj4gPg0KPiANCj4gVGhhdCBkb2VzIHJhaXNlIGEgcXVlc3Rpb24sIHRob3VnaC4g RG9lcyBjaGFuZ2luZyB0aGUgSURUIGludGVyZmVyZQ0KPiB3aXRoIHRoZSBhYmlsaXR5IG9mIHRo ZSBVRUZJIGJvb3Qgc2VydmljZXMgdG8gcmVjZWl2ZSBhbmQgaGFuZGxlIHRoZQ0KPiB0aW1lciBp bnRlcnJ1cHQ/IEJlY2F1c2UgYmVmb3JlIEV4aXRCb290U2VydmljZXMoKSwgdGhhdCBpcyBvd25l ZCBieQ0KPiB0aGUgZmlybXdhcmUsIGFuZCBVRUZJIGhlYXZpbHkgcmVsaWVzIG9uIGl0IGZvciBl dmVyeXRoaW5nIChldmVudA0KPiBoYW5kbGluZywgcG9sbGluZyBtb2RlIGJsb2NrL25ldHdvcmsg ZHJpdmVycywgZXRjKQ0KPiANCj4gSWYgcmVzdG9yaW5nIHRoZSBJRFQgdGVtcG9yYXJpbHkganVz dCBwYXBlcnMgb3ZlciB0aGlzIGJ5IGNyZWF0aW5nDQo+IHRpbnkgd2luZG93cyB3aGVyZSB0aGUg dGltZXIgaW50ZXJydXB0IHN0YXJ0cyB3b3JraW5nIGFnYWluLCB0aGlzIGlzDQo+IGJhZCwgYW5k IHdlIG5lZWQgdG8gZmlndXJlIG91dCBhbm90aGVyIHdheSB0byBhZGRyZXNzIHRoZSBvcmlnaW5h bA0KPiBwcm9ibGVtLg0KDQpDb3VsZCB0aGUgd2hvbGUgdGhpbmcgYmUgZmxpcHBlZD8NCg0KU28g bG9hZCBhIHRlbXBvcmFyeSBJRFQgc28gdGhhdCB5b3UgY2FuIGRldGVjdCBpbnZhbGlkIGluc3Ry dWN0aW9ucw0KYW5kIHJlc3RvcmUgdGhlIFVFRkkgSURUIGltbWVkaWF0ZWx5IGFmdGVyd2FyZHM/ DQoNCkknbSBndWVzc2luZyB0aGUgR0RUIGlzIGNoYW5nZWQgaW4gb3JkZXIgdG8gYWNjZXNzIGFs bCBvZiBwaHlzaWNhbA0KbWVtb3J5ICh3ZWxsIGVub3VnaCB0byBsb2FkIHRoZSBrZXJuZWwpLg0K Q291bGQgdGhhdCBiZSBkb25lIHVzaW5nIHRoZSBMRFQ/DQpJdCBpcyB1bmxpa2VseSB0aGF0IHRo ZSBVRUZJIGNhcmVzIGFib3V0IHRoYXQ/DQoNCklzIHRoaXMgMzJiaXQgbm9uLXBhZ2VkIGNvZGU/ DQpSdW5uaW5nIHRoYXQgd2l0aCBhIHBoeXNpY2FsIG1lbW9yeSBvZmZzZXQgbWFkZSBteSBoZWFk IGh1cnQuDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1s ZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJh dGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=