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 6BB0AC67838 for ; Thu, 6 Dec 2018 15:11:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A3F120700 for ; Thu, 6 Dec 2018 15:11:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3A3F120700 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-security-module-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725921AbeLFPLX (ORCPT ); Thu, 6 Dec 2018 10:11:23 -0500 Received: from mga06.intel.com ([134.134.136.31]:56599 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725862AbeLFPLX (ORCPT ); Thu, 6 Dec 2018 10:11:23 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Dec 2018 07:11:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,322,1539673200"; d="scan'208";a="105374446" Received: from jbdelcuv-mobl.amr.corp.intel.com (HELO [10.251.27.202]) ([10.251.27.202]) by fmsmga007.fm.intel.com with ESMTP; 06 Dec 2018 07:11:21 -0800 Subject: Re: [RFC v2 10/13] keys/mktme: Add the MKTME Key Service type for memory encryption To: "Sakkinen, Jarkko" , "tglx@linutronix.de" , "Schofield, Alison" , "dhowells@redhat.com" Cc: "kirill.shutemov@linux.intel.com" , "peterz@infradead.org" , "jmorris@namei.org" , "Huang, Kai" , "keyrings@vger.kernel.org" , "linux-mm@kvack.org" , "linux-security-module@vger.kernel.org" , "Williams, Dan J" , "x86@kernel.org" , "hpa@zytor.com" , "mingo@redhat.com" , "luto@kernel.org" , "bp@alien8.de" , "Nakajima, Jun" References: <42d44fb5ddbbf7241a2494fc688e274ade641965.1543903910.git.alison.schofield@intel.com> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On 12/6/18 12:51 AM, Sakkinen, Jarkko wrote: > On Mon, 2018-12-03 at 23:39 -0800, Alison Schofield wrote: >> MKTME (Multi-Key Total Memory Encryption) is a technology that allows >> transparent memory encryption in upcoming Intel platforms. MKTME will >> support mulitple encryption domains, each having their own key. The main >> use case for the feature is virtual machine isolation. The API needs the >> flexibility to work for a wide range of uses. > Some, maybe brutal, honesty (apologies)... > > Have never really got the grip why either SME or TME would make > isolation any better. If you can break into hypervisor, you'll > have these tools availabe: For systems using MKTME, the hypervisor is within the "trust boundary". From what I've read, it is a bit _more_ trusted than with AMD's scheme. But, yes, if you can mount a successful arbitrary code execution attack against the MKTME hypervisor, you can defeat MKTME's protections. If the kernel creates non-encrypted mappings of memory that's being encrypted with MKTME, an arbitrary read primitive could also be a very valuable in defeating MKTME's protections. That's why Andy is proposing doing something like eXclusive-Page-Frame-Ownership (google XPFO).