A security program code generator is configured to automatically generate program code used to perform one or more validation checks of components operating in user mode. In one implementation, for example, the program code generator receives one or more files that include declarative values and parameters regarding one or more function calls made by any user mode component. The program code generator then takes the file of declarative call descriptions and automatically generates a user mode stub and a kernel mode stub for each function call of interest to be handled by a kernel mode component. The file(s) that include the user mode stub and the kernel mode stub can then be compiled and linked into the operating system components.