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Re: [PATCH v2 06/17] xen/xsm: Expand XSM_XS_PRIV for untargetable domains
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 30 Jul 2025 17:19:50 +0200
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 30 Jul 2025 15:20:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.07.2025 23:14, Jason Andryuk wrote:
> Untargetable domains are currently hidden from the control domain -
> e.g. xl list will not show them. getdomaininfo fails on the
> !is_hypercall_target() check in XSM_TARGET. Add control domain to the
> XSM_XS_PRIV check so it can pass.
This feels like a pretty gross abuse of XS_PRIV. It once again supports
my take that the level of granularity you want will require Flask. Or of
course you could also come up with a new access control mechanism, much
lighter-weight than Flask, but still not dummy nor SILO.
As per my reply to an earlier patch - whether it is okay to prevent e.g.
"xl list" to see all domains is questionable as well. I'm not seeing
"interference" there.
> --- a/xen/include/xsm/dummy.h
> +++ b/xen/include/xsm/dummy.h
> @@ -87,7 +87,8 @@ static always_inline int xsm_default_action(
> fallthrough;
> case XSM_XS_PRIV:
> if ( action == XSM_XS_PRIV &&
> - evaluate_nospec(is_xenstore_domain(src)) )
> + (evaluate_nospec(is_xenstore_domain(src)) ||
> + is_control_domain(src)) )
Like in patch 2 (in is_priv_domain()), I think this wants collapsing the
two evaluate_nospec() into a single one.
Jan
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