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=-2.5 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT 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 2FFDEC282DA for ; Wed, 17 Apr 2019 19:52:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EDDC6205C9 for ; Wed, 17 Apr 2019 19:52:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=tycho-ws.20150623.gappssmtp.com header.i=@tycho-ws.20150623.gappssmtp.com header.b="aQd1aeO2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732731AbfDQTwT (ORCPT ); Wed, 17 Apr 2019 15:52:19 -0400 Received: from mail-qk1-f195.google.com ([209.85.222.195]:42462 "EHLO mail-qk1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732485AbfDQTwT (ORCPT ); Wed, 17 Apr 2019 15:52:19 -0400 Received: by mail-qk1-f195.google.com with SMTP id b74so15126144qkg.9 for ; Wed, 17 Apr 2019 12:52:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tycho-ws.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Uru0Jbz4B8OYoAQYJt2C55pxQlJkGfm/+9nWfpEgZPQ=; b=aQd1aeO2CXg7gYGOcvtEUcXMyHfbY37wbHMchotalTNQZ2RxhJxZjLextp8ZWtQKA9 ElDQno8BAegcG5tWka17SzrohZ4MVbbZKar4D1otZqJs6viRLbUgEjktrlyhXOKFoRRr Xqiz5AKyn2cqhIrRtLq2t6y4exSmyJWI+xolW690Pg05j5xcNprdRzKeq2BM/bBe7uD9 Mna5BBYIALxIoHSfeGneAc4J6qlxgdl4umsVpI32Ws6NYWtDPh57d2uN8d9IDlmzf+34 LgmN/QkDbE6mdN4NdIUb/v42FYkyBUW0DAfjxZ5Ti4wxRTTn11MCXXYyLy0I5wiy+cup dbCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=Uru0Jbz4B8OYoAQYJt2C55pxQlJkGfm/+9nWfpEgZPQ=; b=JAWY/Bmx8PjWM0LAZht/9AlyFsPd1AyChuqSTmd3ZQEJ2rfYTMhwgRjeze6pUefzCb jwi1cMNlXQPqMHHAVk3nrft2ekmET0qC5lgjDJI8ZZIRtdh49NUYY3OXfdNfO0nh6m6v jJ9cTEzkjcxUHb8RedXUInR1XcQfexk4cj/M5zgJdlhUEOhKG85VAv3y/5bsgBEWwERJ 3WVZHF5Hw464HUcNOHqZg+bdw6qqDNGv3ZWtAOadR25IsQ3cmZFedkOYt3AObtz48aa5 vY6dggcPzQDTTyl5xHHEptK4EAMBX4qcgbfRpEkk5xJL0QgrzTC1LNphMNGSSHE8aB26 AZdQ== X-Gm-Message-State: APjAAAWGDeMG1TodqywCJH5MOOY455efT3pTMf2mrSfV+f6I9cnxUrtQ xezqdSeiIRMtQCIjL7lPQiF7Rw== X-Google-Smtp-Source: APXvYqxALLwioQYr156hXrQYUcVxn+eWorINAhsmvLl+aLFkTmy03SLo3tuclnCeyTO/WqSU4/UWYQ== X-Received: by 2002:ae9:e64d:: with SMTP id x13mr70666110qkl.112.1555530737946; Wed, 17 Apr 2019 12:52:17 -0700 (PDT) Received: from cisco ([2601:282:901:dd7b:7136:cebf:c0d3:8091]) by smtp.gmail.com with ESMTPSA id v30sm28498609qta.4.2019.04.17.12.52.15 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 17 Apr 2019 12:52:17 -0700 (PDT) Date: Wed, 17 Apr 2019 13:52:13 -0600 From: Tycho Andersen To: Andy Lutomirski Cc: Khalid Aziz , Ingo Molnar , Juerg Haefliger , jsteckli@amazon.de, Kees Cook , Konrad Rzeszutek Wilk , Juerg Haefliger , deepa.srinivasan@oracle.com, chris hyser , Tyler Hicks , "Woodhouse, David" , Andrew Cooper , Jon Masters , Boris Ostrovsky , iommu@lists.linux-foundation.org, X86 ML , linux-arm-kernel , "open list:DOCUMENTATION" , LKML , Linux-MM , LSM List , Khalid Aziz , Linus Torvalds , Andrew Morton , Thomas Gleixner , Peter Zijlstra , Dave Hansen , Borislav Petkov , "H. Peter Anvin" , Arjan van de Ven , Greg Kroah-Hartman Subject: Re: [RFC PATCH v9 03/13] mm: Add support for eXclusive Page Frame Ownership (XPFO) Message-ID: <20190417195213.GE3758@cisco> References: <20190417161042.GA43453@gmail.com> <20190417170918.GA68678@gmail.com> <8d314750-251c-7e6a-7002-5df2462ada6b@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On Wed, Apr 17, 2019 at 12:49:04PM -0700, Andy Lutomirski wrote: > I also proposed using a gcc plugin (or upstream gcc feature) to add > some instrumentation to any code that pops RSP to verify that the > resulting (unsigned) change in RSP is between 0 and THREAD_SIZE bytes. > This will make ROP quite a bit harder. I've been playing around with this for a bit, and hope to have something to post Soon :) Tycho