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Date:   Thu, 11 Apr 2019 13:36:37 -0700
From:   Kees Cook <>
To:     Eric Biggers <>
Cc:     Dmitry Vyukov <>,
        Geert Uytterhoeven <>,
        Herbert Xu <>,
        linux-security-module <>,
        Linux ARM <>,
        Linux Crypto Mailing List <>,
        Linux Kernel Mailing List <>,
        Laura Abbott <>,
        Rik van Riel <>
Subject: Re: crypto: Kernel memory overwrite attempt detected to spans
 multiple pages

On Thu, Apr 11, 2019 at 12:26 PM Eric Biggers <> wrote:
> Well, I guess I'll just add __GFP_COMP so I at least don't get spammed with
> useless bug reports.

Thanks, I appreciate it.

> But I don't think it's in any way acceptable to change the semantics of the
> kernel's page allocator but only under some obscure config option, don't
> document it anywhere, ignore the known problems for years, say that the option
> is broken anyway so it shouldn't be used, and have to exchange 15 emails to get
> anything resembling an explanation.

I understand what you mean, yeah. I'm sorry I wasn't clear about it
earlier. What do you think might help the situation as far as

Kees Cook

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