linux-kernel - Re: [RESEND PATCH v2] media: mtk-jpeg: Fix use after free bug due to uncanceled work

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Date:   Tue, 18 Jul 2023 11:07:01 +0800
From:   Zheng Hacker <hackerzheng666@...il.com>
To:     Alexandre Mergnat <amergnat@...libre.com>
Cc:     Zheng Wang <zyytlz.wz@....com>, Kyrie.Wu@...iatek.com,
        bin.liu@...iatek.com, mchehab@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, Irui.Wang@...iatek.com,
        security@...nel.org, 1395428693sheep@...il.com,
        alex000young@...il.com
Subject: Re: [RESEND PATCH v2] media: mtk-jpeg: Fix use after free bug due to
 uncanceled work

Friendly ping

Zheng Hacker <hackerzheng666@...il.com> 于2023年7月16日周日 00:08写道：
>
> Hi,
>
> This issue has not been resolved for a long time. Is there anyone who can help?
>
> Best regards,
> Zheng
>
> Alexandre Mergnat <amergnat@...libre.com> 于2023年7月7日周五 22:11写道：
> >
> >
> >
> > On 07/07/2023 11:24, Zheng Wang wrote:
> > > In mtk_jpeg_probe, &jpeg->job_timeout_work is bound with
> > > mtk_jpeg_job_timeout_work. Then mtk_jpeg_dec_device_run
> > > and mtk_jpeg_enc_device_run may be called to start the
> > > work.
> > > If we remove the module which will call mtk_jpeg_remove
> > > to make cleanup, there may be a unfinished work. The
> > > possible sequence is as follows, which will cause a
> > > typical UAF bug.
> > >
> > > Fix it by canceling the work before cleanup in the mtk_jpeg_remove
> > >
> > > CPU0                  CPU1
> > >
> > >                      |mtk_jpeg_job_timeout_work
> > > mtk_jpeg_remove     |
> > >    v4l2_m2m_release  |
> > >      kfree(m2m_dev); |
> > >                      |
> > >                      | v4l2_m2m_get_curr_priv
> > >                      |   m2m_dev->curr_ctx //use
> >
> > Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>
> >
> > --
> > Regards,
> > Alexandre