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Published in:
2007 | OriginalPaper | Chapter
Security for Multithreaded Programs Under Cooperative Scheduling
Authors : Alejandro Russo, Andrei Sabelfeld
Published in: Perspectives of Systems Informatics
Publisher: Springer Berlin Heidelberg
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Information flow exhibited by multithreaded programs is subtle because the attacker may exploit scheduler properties when deducing secret information from publicly observable outputs. Volpano and Smith have introduced a
protect
command that prevents the scheduler from observing sensitive timing behavior of protected commands and therefore prevents undesired information flows. While a useful construct,
protect
is nonstandard and difficult to implement. This paper presents a transformation that eliminates the need for
protect
under cooperative scheduling. We show that both termination-insensitive and termination-sensitive security can be enforced by variants of the transformation in a language with dynamic thread creation.