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From: George Dunlap <george.dunlap@citrix.com>
To: xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Wei Liu <wei.liu2@citrix.com>,
	Konrad Wilk <konrad.wilk@oracle.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Tim Deegan <tim@xen.org>,
	George Dunlap <george.dunlap@citrix.com>,
	Ross Lagerwall <ross.lagerwall@citrix.com>,
	Julien Grall <julien.grall@arm.com>,
	Jan Beulich <jbeulich@suse.com>,
	Anthony Perard <anthony.perard@citrix.com>,
	Ian Jackson <ian.jackson@citrix.com>
Subject: [PATCH v4 2/6] SUPPORT.md: Add qemu-depriv section
Date: Mon, 5 Nov 2018 18:07:07 +0000	[thread overview]
Message-ID: <20181105180711.20322-2-george.dunlap@citrix.com> (raw)
In-Reply-To: <20181105180711.20322-1-george.dunlap@citrix.com>

Signed-off-by: George Dunlap <george.dunlap@citrix.com>
---
Changes since v3:
- Moved from the qemu-depriv doc patches.
- Reword to include the possibility of having a non-dom0 "devicemodel"
  domain which may want to be protected
- Specify `Linux dom0` as the currently-tech-supported window

CC: Ian Jackson <ian.jackson@citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Jan Beulich <jbeulich@suse.com>
CC: Tim Deegan <tim@xen.org>
CC: Konrad Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>
CC: Anthony Perard <anthony.perard@citrix.com>
CC: Ross Lagerwall <ross.lagerwall@citrix.com>
---
 SUPPORT.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index 4f203da84a..1f0f5857a7 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -525,6 +525,26 @@ Vulnerabilities of a device model stub domain
 to a hostile driver domain (either compromised or untrusted)
 are excluded from security support.
 
+### Device Model Deprivileging
+
+    Status, Linux dom0: Tech Preview, with limited support
+
+This means adding extra restrictions to a device model in order to
+prevent a compromised device model from attack the rest of the domain
+it's running in (normally dom0).
+
+"Tech preview with limited support" means we will not issue XSAs for
+the _additional_ functionality provided by the feature; but we will
+issue XSAs in the event that enabling this feature opens up a security
+hole that would not be present without the feature disabled.
+
+For example, while this is classified as tech preview, a bug in libxl
+which failed to change the user ID of QEMU would not receive an XSA,
+since without this feature the user ID wouldn't be changed. But a
+change which made it possible for a compromised guest to read
+arbitrary files on the host filesystem without compromising QEMU would
+be issued an XSA, since that does weaken security.
+
 ### KCONFIG Expert
 
     Status: Experimental
-- 
2.19.1


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  reply	other threads:[~2018-11-05 18:08 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-05 18:07 [PATCH v4 1/6] docs/qemu-deprivilege: Revise and update with status and future plans George Dunlap
2018-11-05 18:07 ` George Dunlap [this message]
2018-11-06  9:08   ` [PATCH v4 2/6] SUPPORT.md: Add qemu-depriv section Paul Durrant
2018-11-06 12:14     ` George Dunlap
2018-11-06 11:50   ` Ian Jackson
2018-11-05 18:07 ` [PATCH v4 3/6] tools/dm_restrict: Ask QEMU to chroot George Dunlap
2018-11-06  9:14   ` Paul Durrant
2018-11-06 10:28     ` George Dunlap
2018-11-06 10:53       ` Paul Durrant
2018-11-06 11:11         ` Anthony PERARD
2018-11-06 11:12           ` Paul Durrant
2018-11-05 18:07 ` [PATCH v4 4/6] tools/dm_restrict: Unshare mount and IPC namespaces on Linux George Dunlap
2018-11-06  9:16   ` Paul Durrant
2018-11-06 10:29     ` George Dunlap
2018-11-05 18:07 ` [PATCH v4 5/6] tools/dm_depriv: Add first cut RLIMITs George Dunlap
2018-11-06  9:22   ` Paul Durrant
2018-11-06 10:39     ` George Dunlap
2018-11-06 11:52   ` Ian Jackson
2018-11-05 18:07 ` [PATCH v4 6/6] RFC: test/depriv: Add a tool to check process-level depriv George Dunlap
2018-11-06  9:34   ` Paul Durrant
2018-11-06 10:43     ` George Dunlap
2018-11-05 18:08 ` [PATCH v4 1/6] docs/qemu-deprivilege: Revise and update with status and future plans George Dunlap
2018-11-06  9:07 ` Paul Durrant
2018-11-06 11:06   ` Anthony PERARD
2018-11-06 11:50 ` Ian Jackson

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