Re: [PATCH v2 5/5] md: protect md_thread with a new disk level spin lock

[Guoqing Jiang]

On 3/15/23 18:02, Yu Kuai wrote:
> Hi,
>
> 在 2023/03/15 17:39, Guoqing Jiang 写道:
> > On 3/15/23 14:18, Yu Kuai wrote:
> > > From: Yu Kuai <yukuai3@xxxxxxxxxx>
> > >
> > > Our test reports a uaf for 'mddev->sync_thread':
> > >
> > > T1                      T2
> > > md_start_sync
> > >   md_register_thread
> > >             raid1d
> > >              md_check_recovery
> > >               md_reap_sync_thread
> > >                md_unregister_thread
> > >                 kfree
> > >
> > >   md_wakeup_thread
> > >    wake_up
> > >    ->sync_thread was freed
> >
> > Better to provide the relevant uaf (user after free perhaps you mean)
> > log from the test.
> Ok, I'll add uaf report(the report is from v5.10) in the next version.

Can you also try with latest mainline instead of just against 5.10 kernel?

Thanks,
Guoqing