[flashrom] Fwd: BIOS Write Enable bit problem.

[Rich Futyma]

Andrew,

Thank you for your reply. I guess this is where the security and the open
source
stand against each other :).
----
rich

On Mon, Feb 11, 2013 at 2:31 AM, Andrew Goodbody <ajg4tadpole at gmail.com>wrote:

> On 10/02/13 00:45, Rich Futyma wrote:
>
>> Would happen to know which linux driver handles this interrupt?
>>
>
> SMM code is loaded into SMRAM during BIOS POST. Then the access to SMRAM
> is locked so that SMRAM is only visible when an SMI is active. The CPU
> cannot access SMRAM when no SMI is active. The CPU immediately starts to
> execute code from SMRAM once it receives the SMI.
> There is no Linux code involved, this is all initialised before any OS
> code is loaded.
>
>  Also, do you know where is this "correct handshake" described? It seems
>> that once bit 1 is set it can only be cleared by the reset.
>>
>
> No. This handshake is not public knowledge AFAIK. It would not be much of
> a protection mechanism if everyone, including the virus writers, knew how
> to bypass it. I would expect the handshake to involve cryptography as well.
>
> Andrew
>

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