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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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