On 08.07.21 16:22, Konrad Rzeszutek Wilk wrote:
> On Thu, Jul 08, 2021 at 02:43:42PM +0200, Juergen Gross wrote:
>> Xen backends of para-virtualized devices can live in dom0 kernel, dom0
>> user land, or in a driver domain. This means that a backend might
>> reside in a less trusted environment than the Xen core components, so
>> a backend should not be able to do harm to a Xen guest (it can still
>> mess up I/O data, but it shouldn't be able to e.g. crash a guest by
>> other means or cause a privilege escalation in the guest).
>>
>> Unfortunately blkfront in the Linux kernel is fully trusting its
>> backend. This series is fixing blkfront in this regard.
>>
>> It was discussed to handle this as a security problem, but the topic
>> was discussed in public before, so it isn't a real secret.
> 
> Wow. This looks like what Marek did .. in 2018!
> 
> https://lists.xenproject.org/archives/html/xen-devel/2018-04/msg02336.html

Yes, seems to have been a similar goal.

> Would it be worth crediting Marek?

I'm fine mentioning his patches, but I didn't know of his patches until
having sent out V1 of my series.

I'd be interested in learning why his patches haven't been taken back
then.


Juergen