linux-kernel - Re: [PATCH -v2] x86, microcode, AMD: Sanity-check initrd image

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Message-ID: <20140203193000.GD4281@pd.tnic>
Date:	Mon, 3 Feb 2014 20:30:00 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH -v2] x86, microcode, AMD: Sanity-check initrd image

On Mon, Feb 03, 2014 at 02:13:27PM -0500, Boris Ostrovsky wrote:
> I thought that it may be sufficient to check for !container in
> save_microcode_in_initrd_amd() before performing relocation. If the
> signature was wrong, we would have found out about it in
> load_ucode_bsp() -> apply_ucode_in_initrd() and returned right away,

Your original test case which exploded had exactly that scenario - it
was pointing to Intel ucode so container wasn't NULL. Thus we need to
check the sig in find_ucode_in_initrd().

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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