linux-kernel - Re: [PATCH 3/4] randstruct: Disable randomization of ACPICA structs

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Message-ID: <CAGXu5jLkvqbV1=xGrvwLZPiAbswA6M5C3BB0M5MytRabLtEfLg@mail.gmail.com>
Date:   Tue, 20 Jun 2017 12:25:53 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] randstruct: Disable randomization of ACPICA structs

On Mon, Jun 19, 2017 at 11:56 PM, Christoph Hellwig <hch@...radead.org> wrote:
> On Mon, Jun 19, 2017 at 01:56:40PM -0700, Kees Cook wrote:
>> Since the ACPICA source is maintained externally to the kernel, we can
>> neither switch it to designated initializers nor mark it
>> __no_randomize_layout. Until ACPICA-upstream changes[1] land to handle the
>> designated initialization, explicitly skip it in the plugin.
>
> NAK.  ACPI has no business rejecting kernel changes to start with, but
> independent of that your patch was complete garbage anyway.

While I don't disagree with your opinion about ACPICA's inclusion in
the kernel, that isn't a battle I want to have. The ACPI maintainers
have a certain way of doing things, and what I need to change is tiny
compared to that.

> There is no need for function pointers here, please include the patch
> below instead:

Can you send the patch to https://github.com/acpica/acpica ? My change
was finally accepted, so this whole issue will go away on the next
refresh. Until then, I don't want to block the entire automatic
structure selection logic of randstruct on a three-function table. :)

Given that it's a tiny exclusion for randstruct, and there is already
a path in motion to fix it, I think this patch is trivial and
sufficient.

-Kees

-- 
Kees Cook
Pixel Security