From: Ian Jackson <ian.jackson@eu.citrix.com>
Date: Tue, 9 Mar 2021 15:00:47 +0000 (+0000)
Subject: SUPPORT.md: Document speculative attacks status of non-shim 32-bit PV
X-Git-Tag: 4.16.0-rc1~521
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ec4b43107f8663b4a3cf6b9605e1d80152a89f49;p=xen.git

SUPPORT.md: Document speculative attacks status of non-shim 32-bit PV

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

Reported-by: Jann Horn <jannh@google.com>
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>
---

diff --git a/SUPPORT.md b/SUPPORT.md
index d0b8afe41c..d0d4fc6f4f 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -84,7 +84,16 @@ 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