linux-kernel - Re: [PATCH] USB: disable all RNDIS protocol drivers

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Message-ID: <04ea37cc-d97a-3e00-8a99-135ab38860f2@green-communications.fr>
Date:   Wed, 23 Nov 2022 16:40:33 +0100
From:   Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Kalle Valo <kvalo@...nel.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Maciej Żenczykowski <maze@...gle.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Andrzej Pietrasiewicz <andrzejtp2010@...il.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Łukasz Stelmach <l.stelmach@...sung.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        Ilja Van Sprundel <ivansprundel@...ctive.com>,
        Joseph Tartaro <joseph.tartaro@...ctive.com>
Subject: Re: [PATCH] USB: disable all RNDIS protocol drivers

On 23/11/2022 13:46, Greg Kroah-Hartman wrote:
> The Microsoft RNDIS protocol is, as designed, insecure and vulnerable on
> any system that uses it with untrusted hosts or devices.  Because the
> protocol is impossible to make secure, just disable all rndis drivers to
> prevent anyone from using them again.
> 
> Windows only needed this for XP and newer systems, Windows systems older
> than that can use the normal USB class protocols instead, which do not
> have these problems.
> 
> Android has had this disabled for many years so there should not be any
> real systems that still need this.

I kind of disagree here. I have seen plenty of android devices that only 
support rndis for connection sharing, including my android 11 phone 
released in Q3 2020. I suspect the qualcomm's BSP still enable it by 
default.

There are also probably cellular dongles that uses rndis by default. 
Maybe ask the ModemManager people ?

I'm also curious if reimplementing it in userspace would solve the 
security problem.