On 2017-11-21 16:10, Borislav Petkov wrote:
> On Tue, Nov 21, 2017 at 03:45:31PM -0800, Jethro Beekman wrote:
>> Boris & Peter: this key has nothing to do with "trust" or "security".
>
> But with what? Why is the firmware at all involved then?
See http://www.spinics.net/lists/platform-driver-x86/msg13829.html under
"Launch control". Essentially, firmware can make it so that user has no
control over IA32_SGXLEPUBKEYHASHn value.
One comment on the documentation I linked:
> +The BIOS can configure IA32_SGXLEPUBKEYHASHn MSRs before feature control
> +register is locked.
This is not entirely accurate, hardware exists on the market today where
IA32_SGXLEPUBKEYHASHn can't be configured, even by firmware. As
mentioned in my previous email, I'd like to use said hardware.
Jethro Beekman