linux-kernel - Re: Kernel stack read with PTRACE_EVENT_EXIT and io

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Message-ID: <594ca040-3ad3-5cfe-2b9e-8e7804c199b5@gmail.com>
Date:   Thu, 17 Jun 2021 07:40:57 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, Oleg Nesterov <oleg@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        alpha <linux-alpha@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Tejun Heo <tj@...nel.org>, Kees Cook <keescook@...omium.org>
Subject: Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads

Hi Geert,

On 16/06/21 7:38 pm, Geert Uytterhoeven wrote:
> Hi Eric,
>
> On Tue, Jun 15, 2021 at 9:32 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>> Do you happen to know if there is userspace that will run
>> in qemu-system-m68k that can be used for testing?
> There's a link to an image in Laurent's patch series "[PATCH 0/2]
> m68k: Add Virtual M68k Machine"
> https://lore.kernel.org/linux-m68k/20210323221430.3735147-1-laurent@vivier.eu/

Thanks, I'll try that one.

I'll try and implement a few of the solutions Eric came up with for 
alpha, unless someone beats me to it (Andreas?).

Cheers,

     Michael


>
> Gr{oetje,eeting}s,
>
>                          Geert
>