File xsa461.patch of Package xen.36362

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File xsa461.patch of Package xen.36362

Subject: x86/pass-through: documents as security-unsupported when sharing resources
From: Jan Beulich jbeulich@suse.com Tue Aug 13 16:52:44 2024 +0200
Date: Tue Aug 13 16:52:44 2024 +0200:
Git: 638f21616a7a9e94ebae134573ca42d977a65063

When multiple devices share resources and one of them is to be passed
through to a guest, security of the entire system and of respective
guests individually cannot really be guaranteed without knowing
internals of any of the involved guests.  Therefore such a configuration
cannot really be security-supported, yet making that explicit was so far
missing.

This is XSA-461 / CVE-2024-31146.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
master commit: 9c94eda1e3790820699a6de3f6a7c959ecf30600
master date: 2024-08-13 16:37:25 +0200

--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -715,6 +715,11 @@ This feature is not security supported:
 
 Only systems using IOMMUs are supported.
 
+Passing through of devices sharing resources with another device is not
+security supported.  Such sharing could e.g. be the same line interrupt being
+used by multiple devices, one of which is to be passed through, or two such
+devices having memory BARs within the same 4k page.
+
 Not compatible with migration, populate-on-demand, altp2m,
 introspection, memory sharing, or memory paging.

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File xsa461.patch of Package xen.36362

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