From: Greg KH <greg@kroah.com>
To: Hayes Wang <hayeswang@realtek.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
syzbot <syzbot+95afd23673f5dd295c57@syzkaller.appspotmail.com>,
"davem@davemloft.net" <davem@davemloft.net>,
"kuba@kernel.org" <kuba@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"syzkaller-bugs@googlegroups.com"
<syzkaller-bugs@googlegroups.com>,
nic_swsd <nic_swsd@realtek.com>
Subject: Re: [syzbot] WARNING in rtl8152_probe
Date: Fri, 14 May 2021 08:48:51 +0200 [thread overview]
Message-ID: <YJ4dU3yCwd2wMq5f@kroah.com> (raw)
In-Reply-To: <bde8fc1229ec41e99ec77f112cc5ee01@realtek.com>
On Fri, May 14, 2021 at 02:58:00AM +0000, Hayes Wang wrote:
> Alan Stern <stern@rowland.harvard.edu>
> > Sent: Thursday, May 13, 2021 10:26 PM
> [...]
> > Syzbot doesn't test real devices. It tests emulations, and the emulated
> > devices usually behave very strangely and in very peculiar and
> > unexpected ways, so as to trigger bugs in the kernel. That's why the
> > USB devices you see in syzbot logs usually have bizarre descriptors.
>
> Do you mean I have to debug for a device which doesn't exist?
> I don't understand why I must consider a fake device
> which provide unexpected USB descriptor deliberately?
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.
thanks,
greg k-h
next prev parent reply other threads:[~2021-05-14 6:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 9:40 [syzbot] WARNING in rtl8152_probe syzbot
2021-05-13 3:13 ` Hayes Wang
2021-05-13 14:25 ` Alan Stern
2021-05-14 2:58 ` Hayes Wang
2021-05-14 6:41 ` Dan Carpenter
2021-05-14 7:49 ` Hayes Wang
2021-05-14 6:48 ` Greg KH [this message]
2021-05-14 7:50 ` Hayes Wang
2021-05-14 8:26 ` Greg KH
2021-05-14 10:32 ` Hayes Wang
2021-05-14 15:32 ` Alan Stern
2021-05-17 1:01 ` Hayes Wang
2021-05-17 10:00 ` Oliver Neukum
2021-05-17 13:47 ` Alan Stern
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