linux-kernel - Re: [PATCH] i3c: master: svc: Fix use after free vulnerability in svc_i3c

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Message-ID: <20240912085709.6ec0a289@xps-13>
Date: Thu, 12 Sep 2024 08:57:09 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.li@....com>
Cc: Kaixin Wang <kxwang23@...udan.edu.cn>, 21210240012@...udan.edu.cn,
 21302010073@...udan.edu.cn, conor.culhane@...vaco.com,
 alexandre.belloni@...tlin.com, linux-i3c@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i3c: master: svc: Fix use after free vulnerability in
 svc_i3c_master Driver Due to Race Condition

Hi,

Frank.li@....com wrote on Wed, 11 Sep 2024 11:24:57 -0400:

> On Wed, Sep 11, 2024 at 11:01:35PM +0800, Kaixin Wang wrote:
> > In the svc_i3c_master_probe function, &master->hj_work is bound with
> > svc_i3c_master_hj_work, &master->ibi_work is bound with
> > svc_i3c_master_ibi_work. And svc_i3c_master_ibi_work  can start the
> > hj_work, svc_i3c_master_irq_handler can start the ibi_work.
> >
> > If we remove the module which will call svc_i3c_master_remove to
> > make cleanup, it will free master->base through i3c_master_unregister
> > while the work mentioned above will be used. The sequence of operations
> > that may lead to a UAF bug is as follows:
> >
> > CPU0                                         CPU1
> >
> >                                     | svc_i3c_master_hj_work
> > svc_i3c_master_remove               |
> > i3c_master_unregister(&master->base)|
> > device_unregister(&master->dev)     |
> > device_release                      |
> > //free master->base                 |
> >                                     | i3c_master_do_daa(&master->base)
> >                                     | //use master->base
> >
> > Fix it by ensuring that the work is canceled before proceeding with the
> > cleanup in svc_i3c_master_remove.
> >
> > Signed-off-by: Kaixin Wang <kxwang23@...udan.edu.cn>
> > ---  
> 
> Please add fixes tag and cc stable.

Yes indeed. Otherwise looks good to me once this fixed.

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

Thanks,
Miquèl