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Re: Differentiating "For experts only" and "Not security supported" in Kconfig
- To: Demi Marie Obenour <demiobenour@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 5 Sep 2025 09:33:53 +0200
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- Cc: Xen developer discussion <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 05 Sep 2025 07:34:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.09.2025 05:47, Demi Marie Obenour wrote:
> Right now, both EXPERT and UNSUPPORTED options are
> not security supported. However, this seems to be
> causing problems for safety-certified use-cases.
>
> Specifically, disabling AMD or Intel support is certainly
> something that should fall under EXPERT IMO, as it is a
> great way to produce a Xen binary that will not boot on
> a large fraction of hardware. However, I see no fundamental
> reason it should not be security supported. Not security
> supporting it means that those producing safety-certified
> builds of Xen (which, presumably, are some of the most
> security-critical there are!) are having to use
> security-unsupported configurations.
>
> This definitely does not seem right to me. Safety
> certification and security support should go hand in hand,
> not conflict with each other! Is there a plan to address this?
Something that isn't security supported upstream still can be security
supported by a downstream. For upstream, we simply need to somehow
limit scope. Any extension of scope will need to come with respective
justification. Yet if done so, I wouldn't see a reason why we shouldn't
at least properly consider such a proposal.
Jan
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