Re: [PATCH v6 3/8] x86/microcode/AMD: Check microcode container data in the early loader

From: Borislav Petkov
Date: Fri Jun 15 2018 - 07:43:06 EST

On Thu, Jun 14, 2018 at 10:56:07PM +0200, Maciej S. Szmigiero wrote:
> At this point we don't know the CPU family the particular patch is for
> since the patch header contains only CPU rev_id, not an explicit family
> number.

patch_fam = 0xf + (mc->processor_rev_id >> 12);

which means, you can do

if (patch_fam != family)
return 0;

like verify_and_add_patch() does before calling verify_patch() with the
correct family of the current CPU.


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