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Date:   Mon, 29 Apr 2019 20:16:07 +0000
From:   Gary R Hook <>
To:     Borislav Petkov <>
CC:     Thomas Gleixner <>,
        "Hook, Gary" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        Alexander Potapenko <>
Subject: Re: [PATCH] x86/mm/mem_encrypt: Disable all instrumentation for SME
 early boot code

On 4/26/19 11:24 AM, Borislav Petkov wrote:
> On Fri, Apr 26, 2019 at 03:11:17PM +0000, Gary R Hook wrote:
>> 2) Turn off instrumentation for lib/cmdline.c. The risk is that any
>>      changes to its code would not enjoy the benefits of KASAN/etc testing
>>      (if enabled).
> What happened to Thomas' suggestion to turn off instrumentation for
> those files only when CONFIG_AMD_MEM_ENCRYPT=y?
> Which is a variant of 2) above with ifdeffery.

Ah, very good. That one escaped my list.

Yes, option 4 would be a combination of using a local copy of strncmp() 
and disabling instrumentation (KASAN, KCOV, whatever) for 
arch/x86/lib/cmdline.c when SME is enabled.

I have any/all of these ready to repost as a version 2 offering. What 
say you?


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