[coreboot] Does the 62xx Series Opteron work *securely* without microcode?

[Timothy Pearson]

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On 01/24/2017 10:55 PM, Taiidan at gmx.com wrote:
> I know the 63xx has a very fatal NMI exploit, but according to the
> libreboot (oh no) website the 62xx works safely out of the box without
> microcode however I would like to confirm if this is actually true.
> 
> I looked at the errata .pdf from the AMD website but I didn't see
> anything that seemed significant.
> 
> 

As far as we have been able to determine it does, again with the caveat
that this is without microcode _updates_, not without microcode.  There
is still the off chance that these CPUs ship with a backdoor inside the
burnt microcode ROM that is patched out with an update.  Unlike POWER
and ARM we are solely dependent on the vendor being trustworthy enough
to disclose issues in their errata document; outside of that, there is
simply no feasible way to know for certain what bugs are lurking inside
the CPU.

- -- 
Timothy Pearson
Raptor Engineering
+1 (415) 727-8645 (direct line)
+1 (512) 690-0200 (switchboard)
https://www.raptorengineering.com
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