linux-kernel - Re: [PATCH] xen/usb: harden xen_hcd against malicious backends

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Date:   Wed, 16 Mar 2022 09:01:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/usb: harden xen_hcd against malicious backends

On Wed, Mar 16, 2022 at 06:29:00AM +0100, Juergen Gross wrote:
> On 15.03.22 18:41, Greg Kroah-Hartman wrote:
> > On Fri, Mar 11, 2022 at 11:35:09AM +0100, Juergen Gross wrote:
> > > Make sure a malicious backend can't cause any harm other than wrong
> > > I/O data.
> > > 
> > > Missing are verification of the request id in a response, sanitizing
> > > the reported actual I/O length, and protection against interrupt storms
> > > from the backend.
> > > 
> > > Signed-off-by: Juergen Gross <jgross@...e.com>
> > > ---
> > >   drivers/usb/host/xen-hcd.c | 57 ++++++++++++++++++++++++++++----------
> > >   1 file changed, 43 insertions(+), 14 deletions(-)
> > 
> > Fails to apply to my tree:
> > 
> > checking file drivers/usb/host/xen-hcd.c
> > Hunk #2 succeeded at 720 (offset -1 lines).
> > Hunk #3 succeeded at 807 (offset -3 lines).
> > Hunk #4 succeeded at 934 (offset -5 lines).
> > Hunk #5 FAILED at 986.
> > Hunk #6 succeeded at 1003 with fuzz 1 (offset -10 lines).
> > Hunk #7 succeeded at 1048 (offset -10 lines).
> > Hunk #8 succeeded at 1072 (offset -10 lines).
> > Hunk #9 succeeded at 1161 (offset -10 lines).
> > Hunk #10 succeeded at 1516 (offset -10 lines).
> > 1 out of 10 hunks FAILED
> > 
> > Any hints?
> 
> Rebase your tree to v5.17-rc8? It is missing the recent security
> patches which modified drivers/usb/host/xen-hcd.c.

I can't rebase, but I can merge.  I'll do that, thanks.

greg k-h