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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 5009AC43381 for ; Wed, 20 Mar 2019 11:11:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 253B621850 for ; Wed, 20 Mar 2019 11:11:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727628AbfCTLLJ (ORCPT ); Wed, 20 Mar 2019 07:11:09 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:20811 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727319AbfCTLLJ (ORCPT ); Wed, 20 Mar 2019 07:11:09 -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-190-gGw3zY5nP3eJLsUE3SxWEw-1; Wed, 20 Mar 2019 11:11:05 +0000 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; Wed, 20 Mar 2019 11:12:07 +0000 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; Wed, 20 Mar 2019 11:12:07 +0000 From: David Laight To: 'Andy Lutomirski' , Elena Reshetova CC: Josh Poimboeuf , Kees Cook , Jann Horn , "Perla, Enrico" , "Ingo Molnar" , Borislav Petkov , Thomas Gleixner , LKML , Peter Zijlstra , Greg KH Subject: RE: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon syscall Thread-Topic: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon syscall Thread-Index: AQHU3ceS4xXYBMxxoEiV6xS01ZPx8qYUXb/A Date: Wed, 20 Mar 2019 11:12:07 +0000 Message-ID: <30998bcd55a34ed38b681f9bb3e3fb87@AcuMS.aculab.com> References: <20190318094128.1488-1-elena.reshetova@intel.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: 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 X-MC-Unique: gGw3zY5nP3eJLsUE3SxWEw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogQW5keSBMdXRvbWlyc2tpDQo+IFNlbnQ6IDE4IE1hcmNoIDIwMTkgMjA6MTYNCi4uLg0K PiA+IEFzIGEgcmVzdWx0IHRoaXMgcGF0Y2ggaW50cm9kdWNlcyA4IGJpdHMgb2YgcmFuZG9tbmVz cw0KPiA+IChiaXRzIDQgLSAxMSBhcmUgcmFuZG9taXplZCwgYml0cyAwLTMgbXVzdCBiZSB6ZXJv IGR1ZSB0byBzdGFjayBhbGlnbm1lbnQpDQo+ID4gYWZ0ZXIgcHRfcmVncyBsb2NhdGlvbiBvbiB0 aGUgdGhyZWFkIHN0YWNrLg0KPiA+IFRoZSBhbW91bnQgb2YgcmFuZG9tbmVzcyBjYW4gYmUgYWRq dXN0ZWQgYmFzZWQgb24gaG93IG11Y2ggb2YgdGhlDQo+ID4gc3RhY2sgc3BhY2Ugd2Ugd2lzaC9j YW4gdHJhZGUgZm9yIHNlY3VyaXR5Lg0KPiANCj4gV2h5IGRvIHlvdSBuZWVkIGZvdXIgemVybyBi aXRzIGF0IHRoZSBib3R0b20/ICB4ODZfNjQgTGludXggb25seQ0KPiBtYWludGFpbnMgOCBieXRl IHN0YWNrIGFsaWdubWVudC4NCg0KSVNUUiB0aGF0IHRoZSBnY2MgZGV2ZWxvcGVycyBhcmJpdHJh cmlseSBjaGFuZ2VkIHRoZSBhbGlnbm1lbnQNCmEgZmV3IHllYXJzIGFnby4NCklmIHRoZSBzdGFj ayBpcyBvbmx5IDggYnl0ZSBhbGlnbmVkIGFuZCB5b3UgYWxsb2NhdGUgYSB2YXJpYWJsZSB0aGF0 DQpyZXF1aXJlcyAxNiBieXRlIGFsaWdubWVudCB5b3UgbmVlZCBnY2MgdG8gZ2VuZXJhdGUgdGhl IGV4dHJhIHN0YWNrDQpmcmFtZSB0byBhbGlnbiB0aGUgc3RhY2suDQpJIGRvbid0IHJlbWVtYmVy IHNlZWluZyB0aGUgcmVsZXZhbnQgZ2NjIG9wdGlvbnMgb24gdGhlIGxpbnV4DQpnY2MgY29tbWFu ZCBsaW5lcy4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJh bWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0 cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==