From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: "Austin S. Hemmelgarn" <ahferroin7@gmail.com>,
gregkh@linuxfoundation.org, Andy Lutomirski <luto@kernel.org>,
Borislav Petkov <bp@suse.de>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
"open list:STAGING SUBSYSTEM" <devel@driverdev.osuosl.org>,
Ingo Molnar <mingo@kernel.org>,
Kristen Carlson Accardi <kristen@linux.intel.com>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
Mathias Krause <minipli@googlemail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Wan Zongshun <Vincent.Wan@amd.com>
Subject: Re: [PATCH 0/6] Intel Secure Guard Extensions
Date: Fri, 6 May 2016 14:27:18 +0300 [thread overview]
Message-ID: <20160506112718.GC24074@intel.com> (raw)
In-Reply-To: <20160506071443.GA32140@amd>
On Fri, May 06, 2016 at 09:14:43AM +0200, Pavel Machek wrote:
> On Fri 2016-05-06 01:52:04, Jarkko Sakkinen wrote:
> > On Mon, May 02, 2016 at 11:37:52AM -0400, Austin S. Hemmelgarn wrote:
> > > On 2016-04-29 16:17, Jarkko Sakkinen wrote:
> > > >On Tue, Apr 26, 2016 at 09:00:10PM +0200, Pavel Machek wrote:
> > > >>On Mon 2016-04-25 20:34:07, Jarkko Sakkinen wrote:
> > > >>>Intel(R) SGX is a set of CPU instructions that can be used by
> > > >>>applications to set aside private regions of code and data. The code
> > > >>>outside the enclave is disallowed to access the memory inside the
> > > >>>enclave by the CPU access control.
> > > >>>
> > > >>>The firmware uses PRMRR registers to reserve an area of physical memory
> > > >>>called Enclave Page Cache (EPC). There is a hardware unit in the
> > > >>>processor called Memory Encryption Engine. The MEE encrypts and decrypts
> > > >>>the EPC pages as they enter and leave the processor package.
> > > >>
> > > >>What are non-evil use cases for this?
> > > >
> > > >I'm not sure what you mean by non-evil.
> > > >
> > > I would think that this should be pretty straightforward. Pretty much every
> > > security technology integrated in every computer in existence has the
> > > potential to be used by malware for various purposes. Based on a cursory
> > > look at SGX, it is pretty easy to figure out how to use this to hide
> > > arbitrary code from virus scanners and the OS itself unless you have some
> > > way to force everything to be a debug enclave, which entirely defeats the
> > > stated purpose of the extensions. I can see this being useful for tight
> > > embedded systems. On a desktop which I have full control of physical access
> > > to though, it's something I'd immediately turn off, because the risk of
> > > misuse is so significant (I've done so on my new Thinkpad L560 too, although
> > > that's mostly because Linux doesn't support it yet).
> >
> > The code in enclave binary is in clear text so it does not really
> > allow you to completely hide any code. It's a signed binary, not
> > encypted binary.
>
> Umm. Now you are evil.
>
> Yes, the code that starts in the enclave may not be encrypted, but I'm
> pretty sure the enclave will download some more code from remote
> server after attestation... x86 or some kind of interpretted code.
>
> (But of course we already know that the technology is evil, as only
> Intel can use it, see Ingo's reply.)
Somehow that email from Ingo dissolved to my inbox :( Anyway, I gave
now my response.
For my part I'll create a second revision of the patch set and update the
documentation so that it has reasonable explanation about root of trust
SGX.
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
/Jarkko
next prev parent reply other threads:[~2016-05-06 11:27 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-25 17:34 [PATCH 0/6] Intel Secure Guard Extensions Jarkko Sakkinen
2016-04-25 17:34 ` [PATCH 1/6] x86: add SGX definition to cpufeature Jarkko Sakkinen
2016-04-25 19:31 ` Andy Lutomirski
2016-04-25 19:48 ` Andi Kleen
2016-04-25 17:34 ` [PATCH 2/6] x86, sgx: common macros and definitions Jarkko Sakkinen
2016-04-25 17:34 ` [PATCH 3/6] intel_sgx: driver for Intel Secure Guard eXtensions Jarkko Sakkinen
2016-04-25 17:55 ` Greg KH
2016-04-25 19:04 ` Jarkko Sakkinen
2016-04-27 6:49 ` Jethro Beekman
2016-04-27 12:40 ` Jarkko Sakkinen
2016-04-27 23:32 ` Jethro Beekman
2016-04-29 20:04 ` Jarkko Sakkinen
2016-04-29 22:22 ` Jethro Beekman
2016-05-09 5:29 ` Jarkko Sakkinen
2016-05-09 7:06 ` Jarkko Sakkinen
2016-04-25 17:34 ` [PATCH 4/6] intel_sgx: ptrace() support for the driver Jarkko Sakkinen
2016-04-25 17:34 ` [PATCH 5/6] intel_sgx: driver documentation Jarkko Sakkinen
2016-04-25 20:01 ` Andy Lutomirski
2016-05-05 22:45 ` Jarkko Sakkinen
2016-05-06 0:52 ` Andy Lutomirski
2016-05-06 11:35 ` Jarkko Sakkinen
2016-05-06 16:24 ` Andy Lutomirski
2016-04-25 17:34 ` [PATCH 6/6] intel_sgx: TODO file for the staging area Jarkko Sakkinen
2016-04-25 17:54 ` Greg KH
2016-04-25 18:56 ` Jarkko Sakkinen
2016-04-25 19:06 ` One Thousand Gnomes
2016-04-25 20:01 ` Andi Kleen
2016-04-26 11:23 ` Jarkko Sakkinen
2016-04-27 6:38 ` Jethro Beekman
2016-05-17 9:38 ` Jarkko Sakkinen
2016-04-25 17:53 ` [PATCH 0/6] Intel Secure Guard Extensions Greg KH
2016-04-25 19:03 ` Jarkko Sakkinen
2016-04-25 19:20 ` Andy Lutomirski
2016-04-26 19:00 ` Pavel Machek
2016-04-26 19:05 ` Andy Lutomirski
2016-04-26 19:41 ` Pavel Machek
2016-04-26 19:56 ` Andy Lutomirski
2016-04-26 20:11 ` Pavel Machek
2016-04-26 20:59 ` One Thousand Gnomes
2016-04-26 21:52 ` Pavel Machek
2016-04-26 22:35 ` Andy Lutomirski
2016-04-26 22:33 ` Andy Lutomirski
2016-04-27 7:32 ` Pavel Machek
2016-04-27 8:18 ` Ingo Molnar
2016-04-27 14:05 ` Andy Lutomirski
2016-05-06 11:23 ` Jarkko Sakkinen
2016-05-06 16:21 ` Andy Lutomirski
2016-04-26 20:16 ` One Thousand Gnomes
2016-04-26 20:19 ` One Thousand Gnomes
2016-04-29 20:17 ` Jarkko Sakkinen
2016-05-01 9:40 ` Pavel Machek
2016-05-02 15:37 ` Austin S. Hemmelgarn
2016-05-03 9:06 ` Dr. Greg Wettstein
2016-05-03 15:38 ` Pavel Machek
2016-05-04 9:04 ` Dr. Greg Wettstein
2016-05-04 11:07 ` Pavel Machek
2016-05-06 11:39 ` Jarkko Sakkinen
2016-05-06 11:54 ` Thomas Gleixner
2016-05-09 5:38 ` Jarkko Sakkinen
2016-05-09 6:27 ` Thomas Gleixner
2016-05-09 9:20 ` Jarkko Sakkinen
2016-05-12 8:50 ` Dr. Greg Wettstein
2016-05-09 7:04 ` Greg KH
2016-05-09 9:13 ` Jarkko Sakkinen
2016-05-08 9:58 ` Dr. Greg Wettstein
2016-05-09 1:32 ` Andy Lutomirski
2016-05-13 9:42 ` Dr. Greg Wettstein
2016-05-13 14:09 ` Andy Lutomirski
2016-05-05 22:52 ` Jarkko Sakkinen
2016-05-06 7:14 ` Pavel Machek
2016-05-06 11:27 ` Jarkko Sakkinen [this message]
2016-04-29 22:08 ` Jarkko Sakkinen
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