netdev - Re: [PATCH net] net: devlink: fix UAF in devlink_compat_running

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20221123182034.3914e03a@kernel.org>
Date:   Wed, 23 Nov 2022 18:20:34 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     Leon Romanovsky <leon@...nel.org>, <netdev@...r.kernel.org>,
        <jiri@...dia.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <pabeni@...hat.com>
Subject: Re: [PATCH net] net: devlink: fix UAF in
 devlink_compat_running_version()

On Wed, 23 Nov 2022 14:40:24 +0800 Yang Yingliang wrote:
> >   	if (err)
> > -		goto err_dl_unregister;
> > +		goto err_resource_unregister;
> >   	nsim_devlink_set_params_init_values(nsim_dev, devlink);
> >   
> > +	/* here, because params API still expect devlink to be unregistered */
> > +	devl_register(devlink);
> > +  
> devlink_set_features() called at last in probe() also needs devlink is 
> not registered.

You can move the devlink_set_features() up. It's also a leftover,
it was preventing reload from happening before probe has finished.
Now the instance is locked until probe is done so there is no race.