netdev - RE: [syzbot] WARNING in rtl8152

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Message-ID: <bddf302301f5420db0fa049c895c9b14@realtek.com>
Date:   Fri, 14 May 2021 07:50:19 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Greg KH <greg@...ah.com>
CC:     Alan Stern <stern@...land.harvard.edu>,
        syzbot <syzbot+95afd23673f5dd295c57@...kaller.appspotmail.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        nic_swsd <nic_swsd@...ltek.com>
Subject: RE: [syzbot] WARNING in rtl8152_probe

Greg KH <greg@...ah.com>
> Sent: Friday, May 14, 2021 2:49 PM
[...]
> Because people can create "bad" devices and plug them into a system
> which causes the driver to load and then potentially crash the system or
> do other bad things.
> 
> USB drivers now need to be able to handle "malicious" devices, it's been
> that way for many years now.

My question is that even I check whole the USB descriptor, the malicious
devices could duplicate it easily to pass my checks. That is, I could add a
lot of checks, but it still doesn't prevent malicious devices. Is this meaningful?

Best Regards,
Hayes