Re: [PATCH 1/8] x86, microcode, intel: forbid some incorrect metadata

Borislav Petkov
2014-10-06T05:15:40Z

On Sun, Oct 05, 2014 at 06:49:08PM -0300, Henrique de Moraes Holschuh wrote:
> How about this:
>
> /*
> * 0 is not a valid microcode revision as it is used to detect the
> * absence of any sucessful microcode update since reset /
> * power-on, see MSR 0x8b (IA32_BIOS_SIGN_ID):
> *
> * "It is required that this register field be pre-loaded with zero
> * prior to executing the CPUID, function 1. If the field remains
> * equal to zero, then there is no microcode update loaded. Another
> * non-zero value will be the signature."
> */
>

Yep.

--
Regards/Gruss,
Boris.

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