linux-kernel - Re: [PATCH] uts: Don't randomize "struct uts

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Message-ID: <CAGXu5jKrM_3ymnmcJ+AE1A3uVPDJykRj0z5B8sDoxM6zUnX-Rg@mail.gmail.com>
Date:   Fri, 6 Jul 2018 16:19:03 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] uts: Don't randomize "struct uts_namespace".

On Fri, Jul 6, 2018 at 9:11 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Fri, Jul 6, 2018 at 3:07 AM Tetsuo Handa
> <penguin-kernel@...ove.sakura.ne.jp> wrote:
>>
>> I noticed that makedumpfile utility is failing to check kernel version, for
>> it depends on offset of "struct uts_namespace"->name being sizeof(int).
>
> For something like this, we fix makedumpfile instead. This is not a
> "user program" using system calls etc, this is something that delves
> into the kernel dump and tries to make sense of it.
>
> Where is the makedumpfile source code? What is it trying to do, and why?
>
> One option is to just say "hey, you can't make much sense of a
> randomized kernel dump anyway, so don't even try".

I would second this -- trying to deal with a randomized layout kernel
dump is going to be much worse than just looking at uts_namespace. :)

-Kees

-- 
Kees Cook
Pixel Security