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

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Message-ID: <CA+55aFzK5z4VQEMQAOqVHXpm+o_gd_eg5Vecck07E=WmoO6BFA@mail.gmail.com>
Date:   Fri, 6 Jul 2018 09:11:55 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Kees Cook <keescook@...omium.org>,
        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 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".

                 Linus