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A trusted platform module (TPM) enhances the security of general purpose computer systems by authenticating the platform at boot time. Security can often be compromised due to the presence of vulnerabilities in the trusted software that is executed on the system. Existing TPM architectures do not support runtime integrity checking and this allows attackers to exploit these vulnerabilities to modify the program after it has been verified (at time of check or TOC) but before the time of its use (at time of use or TOU) to trigger unintended program behavior, such as the execution of malicious code or the leaking of sensitive data. In this paper, we present a dynamic integrity checker (DIC) to improve security by thwarting TOCTOU attacks. The paper makes four contributions. First, we show how to integrate the integrity checker module with a superscalar pipeline. Second, we present an architecture for dynamic integrity …