linux-kernel - Re: BUG: general protection fault in get_mem_cgroup_from

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Message-ID: <CANikGpcg3_hVS+-h5egaLNkHGvG50qVAZ21syT7Ogc6iK1SzKA@mail.gmail.com>
Date: Wed, 4 Sep 2024 12:18:46 -0700
From: Juefei Pu <juefei.pu@...il.ucr.edu>
To: Xingyu Li <xli399@....edu>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>, hannes@...xchg.org, mhocko@...nel.org, 
	shakeel.butt@...ux.dev, muchun.song@...ux.dev, cgroups@...r.kernel.org, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, Yu Hao <yhao016@....edu>
Subject: Re: BUG: general protection fault in get_mem_cgroup_from_objcg

After several tests, I found that the same PoC can cause multiple
different crashes for some unknown reason. Thus, I suspect that the
bug is capable of performing unintended memory writing without being
caught by KASAN.
For reproducibility, I've created a GitHub repo at
https://github.com/TomAPU/Linux610BugReort, which contains the
software versions we used, the QEMU arguments we used to boot up the
kernel, the kernel config we used,  the pre-compiled kernel image,
Dockerfile that can be used to compile the kernel.
I hope this repo will be helpful for analyzing the bug.

Yours,
Juefei

On Thu, Aug 29, 2024 at 4:28 PM Xingyu Li <xli399@....edu> wrote:
>
> Juefei: Can you give some input on this?
>
> On Thu, Aug 29, 2024 at 4:24 PM Roman Gushchin <roman.gushchin@...ux.dev> wrote:
> >
> > On Wed, Aug 28, 2024 at 10:20:04PM -0700, Xingyu Li wrote:
> > > Hi,
> > >
> > > Here is the kernel config file:
> > > https://gist.github.com/TomAPU/64f5db0fe976a3e94a6dd2b621887cdd
> > >
> > > how long does it take to reproduce?
> > > Juefei will follow on this, and I just CC'ed him.
> >
> > I ran the reproducer for several hours in a vm without much success.
> > So in order to make any progress I'd really need a help from your side.
> > If you can reproduce it consistently, can you, please, try to bisect it?
> >
> > Thanks!
>
>
>
> --
> Yours sincerely,
> Xingyu