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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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