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Re: [PATCH v2] SUPPORT.md: split XSM from Flask
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 31 Jul 2024 15:59:12 +0100
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- Cc: Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 31 Jul 2024 14:59:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31/07/2024 3:28 pm, Jan Beulich wrote:
> XSM is a generic framework, which in particular is also used by SILO.
> With this it can't really be experimental: Arm mandates SILO for having
> a security supported configuration.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> v2: Terminology adjustments. Stronger description.
>
> --- a/SUPPORT.md
> +++ b/SUPPORT.md
> @@ -768,13 +768,20 @@ Compile time disabled for ARM by default
>
> Status, x86: Supported, not security supported
>
> -### XSM & FLASK
> +### XSM (Xen Security Module)
I'd suggest using Modules (plural) here.
> +
> + Status: Supported
> +
> +See below for use with FLASK and SILO. The dummy implementation is covered
> here
> +as well.
I still think we want a one-line description of what "dummy" is.
"XSM is a security policy framework. The dummy implementation is
covered by this statement, and implements a policy whereby dom0 is all
powerful. See below for alternative modules (FLASK, SILO)."
?
> +
> +### FLASK XSM Module
>
> Status: Experimental
>
> Compile time disabled by default.
>
> -Also note that using XSM
> +Also note that using FLASK
> to delegate various domain control hypercalls
> to particular other domains, rather than only permitting use by dom0,
> is also specifically excluded from security support for many hypercalls.
> @@ -787,6 +794,10 @@ Please see XSA-77 for more details.
> The default policy includes FLASK labels and roles for a "typical" Xen-based
> system
> with dom0, driver domains, stub domains, domUs, and so on.
>
> +### SILO XSM Module
> +
> + Status: Supported
"SILO implements a policy whereby domUs can only communicate with dom0,
and not with each other"
?
~Andrew
|
