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LDX: Causality Inference by Lightweight Dual Execution

Published: 25 March 2016 Publication History

Abstract

Causality inference, such as dynamic taint anslysis, has many applications (e.g., information leak detection). It determines whether an event e is causally dependent on a preceding event c during execution. We develop a new causality inference engine LDX. Given an execution, it spawns a slave execution, in which it mutates c and observes whether any change is induced at e. To preclude non-determinism, LDX couples the executions by sharing syscall outcomes. To handle path differences induced by the perturbation, we develop a novel on-the-fly execution alignment scheme that maintains a counter to reflect the progress of execution. The scheme relies on program analysis and compiler transformation. LDX can effectively detect information leak and security attacks with an average overhead of 6.08% while running the master and the slave concurrently on separate CPUs, much lower than existing systems that require instruction level monitoring. Furthermore, it has much better accuracy in causality inference.

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cover image ACM SIGPLAN Notices
ACM SIGPLAN Notices  Volume 51, Issue 4
ASPLOS '16
April 2016
774 pages
ISSN:0362-1340
EISSN:1558-1160
DOI:10.1145/2954679
  • Editor:
  • Andy Gill
Issue’s Table of Contents
  • cover image ACM Conferences
    ASPLOS '16: Proceedings of the Twenty-First International Conference on Architectural Support for Programming Languages and Operating Systems
    March 2016
    824 pages
    ISBN:9781450340915
    DOI:10.1145/2872362
    • General Chair:
    • Tom Conte,
    • Program Chair:
    • Yuanyuan Zhou
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Publication History

Published: 25 March 2016
Published in SIGPLAN Volume 51, Issue 4

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  1. causality inference
  2. dual execution
  3. dynamic analysis

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