On Sun 2018-12-09 23:47:17, Josh Triplett wrote: > On Sun, Dec 09, 2018 at 09:06:00PM +0100, Pavel Machek wrote: > ... > > > > > The default permissions for the device are 600. > > > > > > > > Good. This does not belong to non-root. > > > > > > There are entirely legitimate use cases for using this as an > > > unprivileged user. However, that'll be up to system and distribution > > > policy, which can evolve over time, and it makes sense for the *initial* > > > kernel permission to start out root-only and then adjust permissions via > > > udev. > > > > Agreed. > > > > > Building a software certificate store. Hardening key-agent software like > > > ssh-agent or gpg-agent. Building a challenge-response authentication > > > system. Providing more assurance that your server infrastructure is > > > uncompromised. Offloading computation to a system without having to > > > fully trust that system. > > > > I think you can do the crypto stuff... as crypto already verifies the > > results. But I don't think you can do the computation offload. > > You can, as long as you can do attestation.
You can not, because random errors are very easy to trigger for person
with physical access, as I explained in the part of email you
stripped.
> > > As one of many possibilities, imagine a distcc that didn't have to trust
> > > the compile nodes. The compile nodes could fail to return results at
> > > all, but they couldn't alter the results.
> >
> > distcc on untrusted nodes ... oh yes, that would be great.
> >
> > Except that you can't do it, right? :-).
> >
> > First, AFAICT it would be quite hard to get gcc to run under SGX. But
> > maybe you have spare month or three and can do it.
>
> Assuming you don't need to #include files, gcc seems quite simple to run
> in an enclave: data in, computation inside, data out.
So is there a plan to run dynamically linked binaries inside enclave?
Or maybe even python/shell scripts? It looked to me like virtual
memory will be "interesting" for enclaves.
Pavel
--
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