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

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Message-ID: <78b16b06-9cfe-5bfd-5d23-b7e8010024fd@suse.com>
Date:   Wed, 16 Mar 2022 06:29:00 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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 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.


Juergen

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