linux-kernel - RE: [PATCH] usb: gadget: aspeed: fix buffer overflow

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Date:   Fri, 28 Oct 2022 09:55:57 +0000
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Lei Yu <yulei.sh@...edance.com>, Felipe Balbi <balbi@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Henry Tian <tianxiaofeng@...edance.com>,
        Jakob Koschel <jakobkoschel@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: RE: [PATCH] usb: gadget: aspeed: fix buffer overflow

> > > > Thanks for your feedback.
> > > > I tried to reproduce it on my side, and it cannot be reproduce it.
> > > > Here are my test sequences:
> > > > 1. emulate one of the vhub port to usb ethernet through Linux
> > > > gadget
> > > > (ncm)
> > >
> > > We are using rndis instead of ncm.
> > >
> > > > 2. connect BMC vhub to Host
> > > > 3. BMC & Host can ping each other (both usb eth dev default mtu is
> > > > 1500) 4. Set BMC mtu to 1000 (Host OS cannot set usb eth dev mtu
> > > > to 2000, it's maxmtu is 1500)
> > >
> > > Not sure if it's related, but in my case (USB rndis, Debian 10 OS)
> > > it should be able to set MTU to 2000.
> >
> > Using rndis is able to set MTU to 2000, and the issue can be reproduced.
> 
> Please NEVER use rndis anymore.  I need to go just delete that driver from
> the tree.
> 
> It is insecure-by-design and will cause any system that runs it to be instantly
> compromised and it can not be fixed.  Never trust it.
> 
> Even for data throughput tests, I wouldn't trust it as it does odd things with
> packet sizes as you show here.

Thanks for the info, Greg.
If rndis will no longer be supported, how to use usb-ethernet on Windows OS?
For my understanding, ncm/ecm cannot work on Windows OS.