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A number of security mechanisms have been proposed to harden programs writtenin unsafe languages, each of which mitigates a specific type of memory error.Intuitively, enforcing multiple security mechanisms on a target program willimprove its overall security. However, this is not yet a viable approach inpractice because the execution slowdown caused by various security mechanismsis often non-linearly accumulated, making the combined protection prohibitivelyexpensive; further, most security mechanisms are designed for independent orisolated uses and thus are often in conflict with each other, making itimpossible to fuse them in a straightforward way.  In this paper, we present Bunshin, an N-version-based system that enablesdifferent and even conflicting security mechanisms to be combined to secure aprogram while at the same time reducing the execution slowdown. In particular,we propose an automated mechanism to distribute runtime security checks inmultiple program variants in such a way that conflicts between security checksare inherently eliminated and execution slowdown is minimized with parallelexecution. We also present an N-version execution engine to seamlesslysynchronize these variants so that all distributed security checks worktogether to guarantee the security of a target program.

Bunshin: Compositing Security Mechanisms through Diversification (with Appendix)