Function Pointer Protection via Whitelist Validation

The patent applies preliminary action by maintaining a pre-established whitelist of safe callback function pointers and validating callbacks against this whitelist before invocation. The validation mechanism checks whether each callback pointer matches an entry in the whitelist, preventing control-flow hijacking attacks by blocking unauthorized callbacks before they can execute. This approach improves security without requiring complex runtime protection mechanisms, thereby avoiding high system overhead and maintaining compatibility with existing processes.

The patent introduces an intermediary validation mechanism that sits between the callback registration and invocation processes. The whitelist acts as a mediator, allowing the system to enforce security policies without directly modifying existing callback handling code. By validating callbacks against the whitelist through this intermediary layer, the system achieves security improvements while maintaining compatibility with existing processes, as the validation can be integrated into the existing callback infrastructure without requiring fundamental changes to process architecture.