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Quantitative Information-Flow Tracking for C and Related Languages

Author(s)
McCamant, Stephen; Ernst, Michael D.
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Program Analysis
Advisor
Michael Ernst
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Abstract
We present a new approach for tracking programs' use of data througharbitrary calculations, to determine how much information about secretinputs is revealed by public outputs. Using a fine-grained dynamicbit-tracking analysis, the technique measures the information revealedduring a particular execution. The technique accounts for indirectflows, e.g. via branches and pointer operations. Two kinds ofuntrusted annotation improve the precision of the analysis. Animplementation of the technique based on dynamic binary translation isdemonstrated on real C, C++, and Objective C programs of up to half amillion lines of code. In case studies, the tool checked multiplesecurity policies, including one that was violated by a previouslyunknown bug.
Date issued
2006-11-17
URI
http://hdl.handle.net/1721.1/34892
Other identifiers
MIT-CSAIL-TR-2006-076
Series/Report no.
Massachusetts Institute of Technology Computer Science and Artificial Intelligence Laboratory
Keywords
Confidentiality, Privacy, Information disclosure, Tainting, Implicit flows, Valgrind, Memcheck, OpenSSH

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