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Date: Tue, 4 Jul 2023 07:47:31 +0100
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Enrico Mioso <mrkiko.rs@gmail.com>
Cc: Jan Engelhardt <jengelh@inai.de>, linux-kernel@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Kalle Valo <kvalo@kernel.org>,
	Oleksij Rempel <linux@rempel-privat.de>,
	Maciej =?utf-8?Q?=C5=BBenczykowski?= <maze@google.com>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>,
	Jacopo Mondi <jacopo@jmondi.org>,
	=?utf-8?Q?=C5=81ukasz?= Stelmach <l.stelmach@samsung.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	linux-usb@vger.kernel.org, netdev@vger.kernel.org,
	linux-wireless@vger.kernel.org,
	Ilja Van Sprundel <ivansprundel@ioactive.com>,
	Joseph Tartaro <joseph.tartaro@ioactive.com>
Subject: Re: [PATCH] USB: disable all RNDIS protocol drivers
Message-ID: <2023070430-fragment-remember-2fdd@gregkh>
References: <20221123124620.1387499-1-gregkh@linuxfoundation.org>
 <n9108s34-9rn0-3n8q-r3s5-51r9647331ns@vanv.qr>
 <ZKM5nbDnKnFZLOlY@rivendell>
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In-Reply-To: <ZKM5nbDnKnFZLOlY@rivendell>

On Mon, Jul 03, 2023 at 11:11:57PM +0200, Enrico Mioso wrote:
> Hi all!!
> 
> I think the rndis_host USB driver might emit a warning in the dmesg, but disabling the driver wouldn't be a good idea.
> The TP-Link MR6400 V1 LTE modem and also some ZTE modems integrated in routers do use this protocol.
> 
> We may also distinguish between these cases and devices you might plug in - as they pose different risk levels.

Again, you have to fully trust the other side of an RNDIS connection,
any hints on how to have the kernel determine that?

thanks,

greg k-h