Bug 1484476 (CVE-2017-15596)

Summary: CVE-2017-15596 xsa235 xen: add-to-physmap error paths fail to release lock on ARM
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: ailan, drjones, imammedo, jforbes, knoel, m.a.young, mrezanin, pbonzini, rkrcmar, robinlee.sysu, vkuznets, xen-maint
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Last Closed: 2019-06-08 03:21:58 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1503678    
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Description Pedro Sampaio 2017-08-23 17:14:12 UTC
When dealing with the grant map space of add-to-physmap operations,
ARM specific code recognizes a number of error conditions, but fails
to release a lock being held on the respective exit paths.

A malicious guest administrator can cause a denial of service.
Specifically, prevent use of a physical CPU for an indefinite period
of time.

Upstream patch:

http://seclists.org/oss-sec/2017/q3/att-341/xsa235.patch

References:

http://seclists.org/oss-sec/2017/q3/341

Comment 1 Pedro Sampaio 2017-08-23 17:18:29 UTC
Only affects ARM architectures.

Comment 3 Adam Mariš 2017-10-18 14:28:20 UTC
External References:

https://xenbits.xen.org/xsa/advisory-235.html

Comment 4 Adam Mariš 2017-10-18 14:30:18 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1503678]