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

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Date:   Wed, 16 Jun 2021 10:23:41 +1000 (AEST)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Michael Schmitz <schmitzmic@...il.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>,
        Geert Uytterhoeven <geert@...ux-m68k.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>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Subject: Re: Kernel stack read with PTRACE_EVENT_EXIT and io_uring threads

On Wed, 16 Jun 2021, Michael Schmitz wrote:

> > 
> > Do you happen to know if there is userspace that will run in 
> > qemu-system-m68k that can be used for testing?
> 
> I surmise so. I don't use qemu myself - either ARAnyM, or actual 
> hardware. Hardware is limited to 14 MB RAM, which has prevented me from 
> using more than simple regression testing. In particular, I can't test 
> sys_io_uring_setup there.
> 
> Adrian uses qemu a lot, and has supplied disk images to work from on 
> occasion. Maybe he's got something recent enough to support 
> sys_io_uring_setup ... I've CC:ed him in, as I'd love to do some more 
> testing as well.
> 

As well as Debian/m68k, there is also a Gentoo/m68k stage3 rootfs 
available here: 
https://sourceforge.net/projects/linux-mac68k/files/Gentoo%20m68k%20unauthorized/

I built that rootfs last year using Catalyst. Some background (including 
the qemu-system-m68k command-line) can be found here:
https://forums.gentoo.org/viewtopic-t-1100780.html