An Information Flow Monitor-Inlining Compiler for Securing a Core of JavaScript

Web application designers and users alike are interested in isolation properties for trusted JavaScript code in order to prevent confidential resources from being leaked to untrusted parties. Noninterference provides the mathematical foundation for reasoning precisely about the information flows that take place during the execution of a program. Due to the dynamicity of the language, research on mechanisms for enforcing noninterference in JavaScript has mostly focused on dynamic approaches. We present the first information flow monitor inlining compiler for a realistic core of JavaScript. We prove that the proposed compiler enforces termination-insensitive noninterference and we provide an implementation that illustrates its applicability.