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Date: Fri, 12 Oct 2018 01:15:01 +0200 (CEST)
From: Thomas Gleixner <>
To: Jann Horn <>
cc: Kees Cook <>, Andy Lutomirski <>,, 
    Kernel Hardening <>, 
    Ingo Molnar <>, Borislav Petkov <>, 
    "H . Peter Anvin" <>, 
    the arch/x86 maintainers <>, 
    kernel list <>
Subject: Re: [PATCH] x86: entry: flush the cache if syscall error

On Thu, 11 Oct 2018, Jann Horn wrote:
> On Thu, Oct 11, 2018 at 10:56 PM Kees Cook <> wrote:
> > Seems like just changing this with "ax == 0" into "ax >= 0" would solve that?
> As spender points out on twitter
> ( - thanks,
> spender!), struct pt_regs stores register values as "unsigned long",
> and so you'll need to use something like IS_ERR_VALUE().

Ha, so it's not only me who noticed, but then I'm not reading twitter...



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