|Date Added:||6 March 2007|
|File Size:||58.48 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
After such an operation, the value of lpBytesReturned devicekocontrol meaningless. This device object is a File Object:. The control code for the operation. Use the other CreateFile parameters as follows when opening a device handle:.
Open ollydbg handle window and find what does the handle point to 0x90 in the above paste – it points to a device:. If the output buffer is devieiocontrol small to hold all of the data but can hold some entries, some drivers will return as much data as fits.
Note the second parameter to this function: It might look something like this: Sign up or log in Sign up using Google. Select the handle 90right click and select properties. If the operation fails or is pending, the return value is zero.
Userland/Kernel communication – DeviceIoControl method
Follow through can be practiced with the specific driver and specific version: Use the other CreateFile parameters as follows when opening a device handle: Email Required, but never shown. From this value, there is often a switch-statement which selects different behavior depending on the control code.
This control code checks for an incompatible version of driver loaded in memory. Note that both, driver and application, must share lernel IOCTL definition and a good practice is to use a header file included by both.
Now, on the driver side there are a few things you need to know. Usage of proper security measures to deal with malware assumed and emphasized from here onward. Veviceiocontrol this structure there is an array named MajorFunctionwhich is a set of function pointers that the kernel will call when userspace tries to do something with the driver e. As with file, ceviceiocontrol must close the handle with the CloseHandle function.
Having windbg installed can make things easier from here, but we will not use windbg at this moment as it has a steep learning curve.
c – Calling DeviceIoControl async in kernel – Stack Overflow
And how can I continue stepping under ollydbg? For instance we can call DeviceIoControl with overlapped member to get event raised when this call will be complited. Otherwise, the function does not return until the operation has been completed or deviceipcontrol error occurs. Sign up or log in Sign up using Google. To retrieve a device handle, use the CreateFile function. I am going to use ollydbg 2.
malware – how to reverse DeviceIoControl? – Reverse Engineering Stack Exchange
Post as a guest Name. Home Questions Tags Users Unanswered.
A very important concept to understand is the MajorFunction array found in the kernel driver object. Sign up kerneo Facebook. This article will cover the use of the DeviceIOControl function and show both, kernel driver and userland application implementation.
It might look something like this:. Jonathon Reinhart 2 9. How can I send async DeviceIoControl in kernel with callback? To retrieve the number of bytes returned, call GetOverlappedResult.