NDLI: Identification and Evaluation of Sharing Memory Covert Timing Channel in Xen Virtual Machines

Content Provider	IEEE Xplore Digital Library
Author	JingZheng Wu Liping Ding Yongji Wang Wei Han
Copyright Year	2011
Abstract	Virtualization technology is the basis of cloud computing, and the most important property of virtualization is isolation. Isolation guarantees security between virtual machines. However, covert channel breaks the isolation and leaks sensitive message covertly. In this paper, we formally model the isolation into noninterference, and define that all the transmission channels violating noninterference are covert channels. With this definition, we present an identification method based on information flow. This method first compiles the source code into a more structured equivalent code with LLVM. And then a search algorithm is proposed to obtain the shared resources and the operational processes in the equivalent code. A new covert channel termed sharing memory covert timing channel (SMCTC) is identified from Xen source code. We construct channel scenario for SMCTC, and evaluate its threat with the metrics of channel capacity and transmission accuracy. The results show that SMCTC is much more threatened than CPU load based and cache based covert channels etc.
Starting Page	283
Ending Page	291
File Size	1492626
Page Count	9
File Format	PDF
ISBN	9781457708367
ISSN	21596190
DOI	10.1109/CLOUD.2011.10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Xen Cloud computing Receivers Virtual machining Security Channel Performance Evaluation Channel Identification Virtual machine monitors Cloud Computing Channel Scenario Construction Software Timing Covert Timing Channel
Content Type	Text
Resource Type	Article

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