You can use it in KernelGetProcAddress calls. The only limitation is presence of adequate NtQuerySystemInformation implementation in ntdll. To work around this problem, you could specify a path, use side-by-side assemblies , or use GetModuleHandleEx to specify a memory location rather than a DLL name. There is no information about callers of the functions in the output log. If you post a reply, kindly refrain from emailing it, too. The tracer can use the error log for error messages. The program can use it at any time even at interrupt time.

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Exkurs proposed better way – to import NtBuildNumber from ntoskrnl.

This file will describe API functions to be intercepted: The EnumModules class in enummods. There are some differences between the structure of a driver and a DLL. The tracer can start only after the file system is loaded.

The biggest stack consumption comes from local text buffers and related structures, which the tracer creates in order to print the function krrnel and its parameters. It is similar to KernelGetModuleBase3. Kernel-Mode Tracer Requirements The tracer should be able to intercept and monitor functions calls between NT kernel-mode modules.


VirtualKD: E:/PROJECTS/cvsed/mixed/VIRTUA~1/kdpatch/moduleapi.h File Reference

The file name string can include a trailing point character. GetModuleHandle for ntoskrnl is going to fail because it’s not loaded into your memory space. Plus, some antivuruses, firewalls and other useful and not drivers can insert at the very beginning of system functions JMP to themselves.

The application will read and parse the configuration file and store the results in binary form in another file.

The program can also print traces to the debug monitor.

If the file name extension is omitted, the default library extension. Works fine for me.

Tracing NT Kernel-Mode Calls

Do not forget, that when you write code getmodilehandle getting address of imported function like this: This fixed the issue! Rather useful feature, I should say. Each function will have a correspondent stub. The documented way to load and unload drivers is using user-mode functions in advapi Since I want the code to run under NT 4.

There is no information about callers of the functions in the output log.

GetModuleHandleA function | Microsoft Docs

Therefore, the first thread would have a handle to a different module than the one intended. In some rare cases it may fail if the tracer cannot find the executable file or the file was modified after the driver was loaded. Main appliance of these functions is writing drivers with unified binary. It should be able to work at interrupt time, too.


Even if such an API existed, it would be useless in many situations when the current thread is undefined. Does anyone have pointers for how to use function? Another way is to insert a breakpoint instruction INT 3 at the beginning of DbgLoadImageSymbols and install a handler for this interrupt.

The same policy is applied to HAL. It is just not listed. Sign up using Facebook. Thats all – golden key is in our pocket. And I also tell this for those people, who write such clever and tricky drivers: Load a Kernel-mode driver from another Kernel-mode Driver 4. To get extended error information, call GetLastError.

Some interesting issues were found during further testing of new code.

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