File xsa370-1.patch of Package xen.19587

From 4e37e21f6e71752fb69c27ab9f1417a5d19ebedb Mon Sep 17 00:00:00 2001
From: Ian Jackson <ian.jackson@eu.citrix.com>
Date: Tue, 9 Mar 2021 15:00:47 +0000
Subject: [PATCH 1/2] SUPPORT.md: Document speculative attacks status of
 non-shim 32-bit PV

This documents, but does not fix, XSA-370.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---

NB that the security team does not consider the security support
status of un-shimmed 32-bit PV guests in this patch to be particularly
useful. However, we do not consider ourselves to have the authority to decide
to completely de-support 32-bit PV guests without community consultation.

The support status in this patch should therefore be considered
transitional.  A permanent support status is proposed in a subsequent
patch in this series.

v2:
- Fix double 'be'
- Don't mention user -> kernel attacks, which have nothing to do with Xen
---
 SUPPORT.md | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Index: xen-4.11.4-testing/SUPPORT.md
===================================================================
--- xen-4.11.4-testing.orig/SUPPORT.md
+++ xen-4.11.4-testing/SUPPORT.md
@@ -73,7 +73,16 @@ Traditional Xen PV guest
 
 No hardware requirements
 
-    Status: Supported
+    Status, x86_64: Supported
+    Status, x86_32, shim: Supported
+    Status, x86_32, without shim: Supported, with caveats
+
+Due to architectural limitations,
+32-bit PV guests must be assumed to be able to read arbitrary host memory
+using speculative execution attacks.
+Advisories will continue to be issued
+for new vulnerabilities related to un-shimmed 32-bit PV guests
+enabling denial-of-service attacks or privilege escalation attacks.
 
 ### x86/HVM