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Date:   Fri, 15 Jun 2018 13:42:54 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 3/8] x86/microcode/AMD: Check microcode container data
 in the early loader
Message-ID: <20180615114253.GD25559@zn.tnic>
References: <cover.1526767245.git.mail@maciej.szmigiero.name>
 <0c53181bd5eb4e172407d9fde534cedb12e19b98.1526767245.git.mail@maciej.szmigiero.name>
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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.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.