linux-kernel - Re: crypto: Kernel memory overwrite attempt detected to spans multiple pages

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Date:   Thu, 11 Apr 2019 13:36:37 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Rik van Riel <riel@...riel.com>
Subject: Re: crypto: Kernel memory overwrite attempt detected to spans
 multiple pages

On Thu, Apr 11, 2019 at 12:26 PM Eric Biggers <ebiggers@...nel.org> 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
documentation?

-- 
Kees Cook