From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: [PATCH v2 4/4] x86: switch default mapping attributes to non-executable Date: Thu, 21 May 2015 12:14:03 +0100 Message-ID: <555DBDFB.1070800@citrix.com> References: <555DCA7C020000780007CA7E@mail.emea.novell.com> <555DCCE5020000780007CAAA@mail.emea.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1YvOQS-0001kw-SY for xen-devel@lists.xenproject.org; Thu, 21 May 2015 11:14:08 +0000 In-Reply-To: <555DCCE5020000780007CAAA@mail.emea.novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Jan Beulich , xen-devel Cc: Keir Fraser List-Id: xen-devel@lists.xenproject.org On 21/05/15 11:17, Jan Beulich wrote: > Only a very limited subset of mappings need to be done as executable > ones; in particular the direct mapping should not be executable to > limit the damage attackers can cause by exploiting security relevant > bugs. > > The EFI change at once includes an adjustment to set NX only when > supported by the hardware. > > Signed-off-by: Jan Beulich Reviewed-by: Andrew Cooper