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Low-Overhead Software Dynamic Translation

Scott, Kevin; Davidson, Jack; Skadron, Kevin
Format
Report
Author
Scott, Kevin
Davidson, Jack
Skadron, Kevin
Abstract
Software dynamic translation (SDT) is a technology that allows programs to be modified as they are running. The overhead of monitoring and modifying a running program s instructions is often substantial in SDT. As a result SDT can be impractically slow, especially in SDT systems that do not or can not employ dynamic optimization to offset overhead. This is unfortunate since SDT has obvious advantages in modern computing environments and interesting applications of SDT con-tinue to emerge. In this paper we introduce two novel overhead reduction techniques that can improve SDT performance by a factor of three even when no dynamic optimization is performed. To demonstrate the effectiveness of our overhead reduction techniques, and to show the type of useful tasks to which low-overhead, non-optimizing SDT systems might be put, we implemented two dynamic safety checkers with SDT. These dynamic safety checkers perform useful tasks pre-venting buffer-overrun exploits and restricting system call usage in untrusted binaries. Further their performance is similar to, and in some cases better than, state-of-the-art tools that perform the same functions without SDT.
Language
English
Date Received
2012-10-29
Published
University of Virginia, Department of Computer Science, 2001
Published Date
2001
Collection
Libra Open Repository
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