![]() ![]() symlink) to make it accessible to standard user processes. Devices & SymlinksĪ driver, in order to be accessed from user mode, has to create a device and a symbolic link (a.k.a. sys file from which the kernel loads the driver code). The RegistryPath argument is a pointer to a UNICODE_STRING structure (which is a structure containing a UTF-16 string and some other control information) that contains the registry path of the driver image (the. The DriverObject argument represents a pointer to a DRIVER_OBJECT data structure that holds information about the driver itself more on that later. This function is defined by the Microsoft documentation as follows: NTSTATUS DriverEntry(ĭon’t let the SAL annotation (the _In_ before the arguments) scare you, it only means the two arguments are supposed to be input arguments passed to the DriverEntry function. Like most pieces of code, drivers have a sort of “ main” function, known as DriverEntry. With that being said, let’s have a look at the structure of a driver. In fact, drivers are listed by Process Explorer as loaded modules inside the System process (the one with PID 4) You can think of drivers as some sort of kernel-side DLLs. Such events may be interrupts or processes requiring the operating system to do stuff the kernel handles those interrupts and may execute appropriate drivers to fulfill the requests. ![]() In Windows, drivers are essentially loadable modules containing code that will be executed in the context of the kernel when certain events occur. ![]() ![]() Before reverse-engineering the driver itself and looking for vulnerabilities we first have to take a look at what drivers are and how they work. ![]()
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