linux-kernel - Re: [PATCH] x86/microcode/AMD: check microcode file sanity before loading it

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Message-ID: <20180310091838.GA8261@pd.tnic>
Date:   Sat, 10 Mar 2018 10:18:38 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/microcode/AMD: check microcode file sanity before
 loading it

On Sat, Mar 10, 2018 at 01:34:45AM +0100, Maciej S. Szmigiero wrote:
> Currently, it is very easy to make the AMD microcode update driver crash
> or spin on a malformed microcode file since it does very little
> consistency checking on data loaded from such file.

Sorry but if one has enough permissions to install malformed microcode,
crashing the loader is the least of your problems. IOW, I don't see the
justification for the unnecessary complication with all those checks.

Thx.

-- 
Regards/Gruss,
    Boris.

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