linux-kernel - Re: [BACKPORT 4.4.y 04/25] USB: iowarrior: fix oops with malicious USB descriptors

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Message-ID: <CAMz4kuJJPS+GBQqJ4p-PebbKJt5MKK4vQv5EwJAPpL64fBDKLQ@mail.gmail.com>
Date:   Tue, 26 Mar 2019 17:35:46 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Ralf Spenneberg <ralf@...nneberg.net>,
        USB list <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
        Baolin Wang <baolin.wang@...eadtrum.com>,
        orson.zhai@...soc.com,
        Chunyan Zhang (张春艳) 
        <Chunyan.Zhang@...soc.com>
Subject: Re: [BACKPORT 4.4.y 04/25] USB: iowarrior: fix oops with malicious
 USB descriptors

On Tue, 26 Mar 2019 at 16:21, Arnd Bergmann <arnd@...db.de> wrote:
>
> On Tue, Mar 26, 2019 at 2:23 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Fri, Mar 22, 2019 at 04:43:55PM +0100, Arnd Bergmann wrote:
> > > From: Josh Boyer <jwboyer@...oraproject.org>
> > >
> > > The iowarrior driver expects at least one valid endpoint.  If given
> > > malicious descriptors that specify 0 for the number of endpoints,
> > > it will crash in the probe function.  Ensure there is at least
> > > one endpoint on the interface before using it.
> > >
> > > The full report of this issue can be found here:
> > > http://seclists.org/bugtraq/2016/Mar/87
> > >
> > > Reported-by: Ralf Spenneberg <ralf@...nneberg.net>
> > > Cc: stable <stable@...r.kernel.org>
> > > Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
> > > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > (cherry picked from commit 4ec0ef3a82125efc36173062a50624550a900ae0)
> > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > ---
> > >  drivers/usb/misc/iowarrior.c | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> >
> > This commit has been in the tree for a long time.  It was in the 4.4.7
> > release, back in April 2016.  And then it was reverted in commit
> > b7321e81fc36 ("USB: iowarrior: fix NULL-deref at probe") as it broke
> > systems.  So why add it back, the correct functionality should be there
> > today, right?
>
> Sorry I missed that history. The script I used to identify patches noticed
> that this patch was not applied, but I did not have a check for already-
> reverted patches.
>
> Chunyan, Baolin: it seems the spreadtrum 4.4 kernel got this wrong
> as well, by backporting the patch again on top of 4.4.172. Can you check
> the latest internal version for this?

Yes, I saw this patch in our 4.4 kernel.

Orson, we should revert this patch from our kernel as Greg mentioned.

-- 
Baolin Wang
Best Regards