linux-kernel - Re: [PATCH v7 06/12] platform/x86/intel/ifs: Check IFS Image sanity

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Date:   Mon, 9 May 2022 18:31:38 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tony Luck <tony.luck@...el.com>
Cc:     hdegoede@...hat.com, markgross@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, corbet@....net, gregkh@...uxfoundation.org,
        andriy.shevchenko@...ux.intel.com, jithu.joseph@...el.com,
        ashok.raj@...el.com, rostedt@...dmis.org, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, patches@...ts.linux.dev,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v7 06/12] platform/x86/intel/ifs: Check IFS Image sanity

On Fri, May 06, 2022 at 03:54:04PM -0700, Tony Luck wrote:
> From: Jithu Joseph <jithu.joseph@...el.com>
> 
> IFS image is designed specifically for a given family, model and
> stepping of the processor. Like Intel microcode header, the IFS image
> has the Processor Signature, Checksum and Processor Flags that must be
> matched with the information returned by the CPUID.

Is the checksum the only protection against people loading arbitrary IFS
images or are those things signed or encrypted, just like the microcode?

I'd hope they pass the same checks as microcode, when they get loaded,
considering the similarity of how they're handled...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette