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[Xen-devel] Xen Security Advisory 295 v1 - Unlimited Arm Atomics Operations



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                    Xen Security Advisory XSA-295

                  Unlimited Arm Atomics Operations

ISSUE DESCRIPTION
=================

Software targeting pre-Armv8.1-A hardware, Xen included, commonly
implements atomics using Load/Store exclusive instructions in a loop
that will terminate once the store succeeded.

As per the Armv8-A Architecture Reference Manual (ARM DDI0487D.a),
paragraph 2.9.5 "Load-Exclusive and Store-Exclusive instruction usage
restrictions", page B2-143:

"""
It is permissible for the LoadExcl / StoreExcl loop not to make
forward progress if a different thread is repeatedly doing any of the
following in a tight loop:
- - Performing stores to a PA covered by the Exclusives monitor.
- - Prefetching with intent to write to a PA covered by the Exclusives
  monitor.
- - Executing data cache clean, data cache invalidate, or data cache clean
  and invalidate instructions to a
  PA covered by the Exclusives monitor.
- - Executing instruction cache invalidate all instructions.
- - Executing instruction cache invalidate by VA instructions to a PA
  covered by the Exclusives monitor.
"""

The underlying LoadExcl or StoreExcl operation might never succeed,
resulting in an unlimited loop in the hypervisor.

A similar, but independent, issue occurs when compare-and-exchange
operations are misused:

 do
 {
   old = *addr;
 }
 while (cmpxchg(addr, old, new) != new);

This pattern is not safe, because the operation may continuously fail if
another thread in a guest is continuously modifying the value. An
instance of this pattern was found in Xen.


IMPACT
======

An attacker in a domU could perform a denial of service attack on Xen by
accessing a memory region shared with the hypervisor, while Xen is
performing an atomic operation on the same region. As a result Xen could
end up looping boundlessly. See the issue description for more details
on the memory accesses that affect LoadExcl and StoreExcl operations.


VULNERABLE SYSTEMS
==================

Systems running all versions of Xen are affected.

x86 processors are not affected.
Arm processors are vulnerable, both Armv7 and Armv8.


NOTE REGARDING LACK OF EMBARGO
==============================

Other Open Source projects released fixes to the public before we could
arrange for an organized disclosure.


MITIGATION
==========

There are no mitigations.


CREDITS
=======

This issue was discovered by Andrew Cooper of Citrix and Julien Grall of
Arm.


RESOLUTION
==========

Applying the appropriate attached patches resolve this issue.

Please note that these patches enable SILO mode by default, which denies
communications between unprivileged guests. Page sharing between domUs,
thus inter-domains communications and driver domains, are not allowed by
SILO mode. It is necessary to have a complete fix to this vulnerability.

SILO mode is required because the fix relies on Xen being able to
pinpoint the domain owner of the shared page. Without SILO mode, a guest
could share a page with Xen and with a second guest (e.g via grant
table): the second guest could use the foreign page to attack the
hypervisor.

Users are encouraged to write their own Flask policies to enable more
complex configurations. For example, Flask could be used to allow page
sharing between trusted virtual machines (trusted by the administrator).

xsa295/unstable-*.patch         xen-unstable
xsa295/4.12-*.patch             Xen 4.12.x
xsa295/4.11-*.patch             Xen 4.11.x
xsa295/4.10-*.patch             Xen 4.10.x
xsa295/4.9-*.patch              Xen 4.9.x
xsa295/4.8-*.patch              Xen 4.8.x

$ sha256sum xsa295* xsa295*/*
697d0e7d2535b573596087cc0228891d7cb48a3dd2527e1d277bf501132403f4  xsa295.meta
d3205f79cc2dd34a7359cf7c692dd5c00c3e488ccbb503fdd93606133a15aeb9  
xsa295/4.8-01.patch
995ac1a3a4fb7e8ef48664fec8a98963ee84582c1b70ece36ddeaa8889a63274  
xsa295/4.8-02.patch
9b30579cd9043aff58626da159f58519795323d2a6e8dde86b4e5ca667c64828  
xsa295/4.8-03.patch
63cbc7cae8636f496dbf6c743eda2dbc8acdcdcd010546f362f39c461d064b7e  
xsa295/4.8-04.patch
174ce3aadcf28f241106c506e1494ad1343f924e747e8f86073ab375803e15e2  
xsa295/4.8-05.patch
c5d18e3471a9d7dd3f5cef3f56ecb8b54a2a836c4529e9247d1c15332fc6eec9  
xsa295/4.8-06.patch
ebe7a57cc436004cb0bcd3acc9e37a4e8c4b76cc9fde5811587758260bd8ce01  
xsa295/4.8-07.patch
4b45b2e741edc33eb2ed7f55994b12ef7bddd65c8c89856ceba373704a1add03  
xsa295/4.8-08.patch
8493a5367589988310681b09d775009c6feabb696a308f69ae6cb254d445d80d  
xsa295/4.8-09.patch
dd226d28c19b2dc2bc68ebb03d7f573273506ce96c3b31a4f627f9682b32f094  
xsa295/4.8-10.patch
70af876fb95e11b73a532fa560ddf0e2057668526455618da54faef5aaa19908  
xsa295/4.8-11.patch
97ad268d6be9becb6718e688517bb9e8ded2781e62a384383d7d089833c4af75  
xsa295/4.8-12.patch
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xsa295/4.8-13.patch
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xsa295/4.8-14.patch
1835d88402ce9095c37c604fc5b20f8b48d1c2e15d320336e7b1c11c0f0bad82  
xsa295/4.8-15.patch
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xsa295/4.8-16.patch
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xsa295/4.8-17.patch
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xsa295/4.8-18.patch
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xsa295/4.8-19.patch
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xsa295/4.8-20.patch
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xsa295/4.8-21.patch
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xsa295/4.9-01.patch
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xsa295/4.9-02.patch
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xsa295/4.9-03.patch
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xsa295/4.9-04.patch
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xsa295/4.9-05.patch
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xsa295/4.9-06.patch
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xsa295/4.9-07.patch
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xsa295/4.9-08.patch
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xsa295/4.9-09.patch
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xsa295/4.9-10.patch
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xsa295/4.9-11.patch
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xsa295/4.9-12.patch
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xsa295/4.9-13.patch
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xsa295/4.9-14.patch
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xsa295/4.9-15.patch
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xsa295/4.9-16.patch
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xsa295/4.9-17.patch
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xsa295/4.9-18.patch
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xsa295/4.9-19.patch
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xsa295/4.9-20.patch
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xsa295/4.10-01.patch
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xsa295/4.10-02.patch
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xsa295/4.10-03.patch
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xsa295/4.10-04.patch
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xsa295/4.10-05.patch
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xsa295/4.10-06.patch
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xsa295/4.10-07.patch
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xsa295/4.10-08.patch
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xsa295/4.10-09.patch
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xsa295/4.10-10.patch
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xsa295/4.10-11.patch
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xsa295/4.10-12.patch
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xsa295/4.10-13.patch
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xsa295/4.10-14.patch
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xsa295/4.10-15.patch
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xsa295/4.10-16.patch
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xsa295/4.10-17.patch
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xsa295/4.10-18.patch
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xsa295/4.10-19.patch
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xsa295/4.10-20.patch
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xsa295/4.11-01.patch
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xsa295/4.11-02.patch
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xsa295/4.11-03.patch
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xsa295/4.11-04.patch
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xsa295/4.11-05.patch
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xsa295/4.11-06.patch
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xsa295/4.11-07.patch
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xsa295/4.11-08.patch
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xsa295/4.11-09.patch
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xsa295/4.11-10.patch
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xsa295/4.11-11.patch
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xsa295/4.11-12.patch
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xsa295/4.11-13.patch
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xsa295/4.11-14.patch
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xsa295/4.11-15.patch
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xsa295/4.11-16.patch
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xsa295/4.11-17.patch
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xsa295/4.11-18.patch
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xsa295/4.11-19.patch
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xsa295/4.11-20.patch
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xsa295/4.12-01.patch
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xsa295/4.12-02.patch
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xsa295/4.12-03.patch
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xsa295/4.12-04.patch
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xsa295/4.12-05.patch
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xsa295/4.12-06.patch
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xsa295/4.12-07.patch
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xsa295/4.12-08.patch
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xsa295/4.12-09.patch
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xsa295/4.12-10.patch
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xsa295/4.12-11.patch
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xsa295/4.12-12.patch
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xsa295/4.12-13.patch
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xsa295/4.12-14.patch
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xsa295/4.12-15.patch
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xsa295/4.12-16.patch
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xsa295/4.12-17.patch
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xsa295/unstable-01.patch
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xsa295/unstable-02.patch
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xsa295/unstable-03.patch
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xsa295/unstable-04.patch
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xsa295/unstable-05.patch
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xsa295/unstable-06.patch
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xsa295/unstable-07.patch
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xsa295/unstable-08.patch
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xsa295/unstable-09.patch
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xsa295/unstable-10.patch
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xsa295/unstable-11.patch
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xsa295/unstable-12.patch
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xsa295/unstable-13.patch
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xsa295/unstable-14.patch
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xsa295/unstable-15.patch
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