linux-kernel - Re: [syzbot] WARNING in rtl8152

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 17 May 2021 12:00:19 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Hayes Wang <hayeswang@...ltek.com>,
        Alan Stern <stern@...land.harvard.edu>
Cc:     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

Am Montag, den 17.05.2021, 01:01 +0000 schrieb Hayes Wang:
> Alan Stern <stern@...land.harvard.edu>
> > Sent: Friday, May 14, 2021 11:33 PM

> > So if a peculiar emulated device created by syzbot is capable of
> > crashing the driver, then somewhere there is a bug which needs to
> > be
> > fixed.  It's true that fixing all these bugs might not protect
> > against a
> > malicious device which deliberately behaves in an apparently
> > reasonable
> > manner.  But it does reduce the attack surface.
> 
> Thanks for your response.
> I will add some checks.

Hi,

the problem in this particular case is in
static bool rtl_vendor_mode(struct usb_interface *intf)
which accepts any config number. It needs to bail out
if you find config #0 to be what the descriptors say,
treating that as an unrecoverable error.

	Regards
		Oliver