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Date:   Wed, 22 Nov 2017 15:17:09 -0800
From:   Kees Cook <>
To:     Borislav Petkov <>
Cc:     Ricardo Neri <>,
        LKML <>
Subject: Re: x86/insn-eval: negative return value?

On Wed, Nov 22, 2017 at 3:06 PM, Borislav Petkov <> wrote:
> On Wed, Nov 22, 2017 at 01:48:55PM -0800, Kees Cook wrote:
>> Cool, yeah, that looks like it would solve it. Thanks for taking a look!
> Btw, how do you build the kernel with clang?
> I tried:
> make -j9 CC=clang HOSTCC=clang
> and clang here is:
> clang version 3.8.1-24 (tags/RELEASE_381/final)

clang-5.0 appears to be the minimum version needed (to produce
something that actually boots and runs).

$ clang-5.0 --version
clang version 5.0.0-3 (tags/RELEASE_500/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin


Kees Cook
Pixel Security

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