Re: [PATCH 01/12] evtchn: refuse EVTCHNOP_status for Xen-bound event channels

[Julien Grall <julien@xxxxxxx>]

Hi Jan,

On 28/09/2020 11:56, Jan Beulich wrote:
> Callers have no business knowing the state of the Xen end of an event
> channel.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

> --- a/xen/common/event_channel.c
> +++ b/xen/common/event_channel.c
> @@ -933,6 +933,11 @@ int evtchn_status(evtchn_status_t *statu
>       }
>   
>       chn = evtchn_from_port(d, port);
> +    if ( consumer_is_xen(chn) )
> +    {
> +        rc = -EACCES;
> +        goto out;
> +    }
>   
>       rc = xsm_evtchn_status(XSM_TARGET, d, chn);
>       if ( rc )
--
Julien Grall