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Idov

Wow64cpu module

8 posts in this topic

Hi!
I have a process which debugs another 32bit process on windows7 (x64).
I paused the debugged process and watched it using ProcessMonitor.
In ProcessMonitor, on the top of the stack i see a method from wow64cpu.dll but my debugged process doesn't load this DLL!

I even wrote a litlle program in C# to show me what modules are loaded, and this DLL is not loaded.

How can the debbuged process use a method from that DLL>

what is going on??? :(
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[color=#222222][font=arial, sans-serif][size=2]WOW64 == Windows 32-bit on Windows 64-bit

[/size][/font][/color]
[color=#222222][font=arial, sans-serif][size=2]Nothing is going on. Just ignore it! (It's the mechanism with which windows x64 emulates the 32bit DLL's required for the 32bit process). [/size][/font][/color]
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[quote name='RobTheBloke' timestamp='1323455187' post='4892271']
[color="#222222"][font="arial, sans-serif"][size="2"]WOW64 == Windows 32-bit on Windows 64-bit

[/size][/font][/color]
[color="#222222"][font="arial, sans-serif"][size="2"]Nothing is going on. Just ignore it! (It's the mechanism with which windows x64 emulates the 32bit DLL's required for the 32bit process). [/size][/font][/color]
[/quote]


Ok, I want to ignore it. :)
But I need to identify it when it happens so I'll be able to associate addresses in the callstack with the module and ignore them.
Is it even possible getting the information about this module (base address and size) if it isn't really even loaded?
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[quote name='Idov' timestamp='1323456580' post='4892280']
But I need to identify it when it happens so I'll be able to associate addresses in the callstack with the module and ignore them.[/quote]No you don't, because there aren't any.

You're not understanding, think of the wow64cpu dll as the emulator that allows your code to run. A program can't [i]see[/i] into it's emulator.
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[quote name='iMalc' timestamp='1323457699' post='4892295']
[quote name='Idov' timestamp='1323456580' post='4892280']
But I need to identify it when it happens so I'll be able to associate addresses in the callstack with the module and ignore them.[/quote]No you don't, because there aren't any.

You're not understanding, think of the wow64cpu dll as the emulator that allows your code to run. A program can't [i]see[/i] into it's emulator.
[/quote]

what? wait...

Maybe there aren't any addresses from this module in the callstack (I suppose I really didn't see any in the callstack), but my EIP register of my debugged process' thread DOES point at an instruction in wow64cpu :)
Did you mean that I can't get the information about wow64cpu?
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Think of it this way: if you took a digital logic analyzer and pointed it at the right spot on your CPU while executing a program, you could see the microcode instructions being shuffled around. Does this mean you can debug the microcode layer of the CPU circuit from your assembly language program?
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On 64-bit computers, Process Explorer is a 64-bit program so it exists outside the 'emulator' and can see into it.

To get the full user-mode call stack of a WoW64 thread, call GetThreadContext and StackWalk64(IMAGE_FILE_MACHINE_X64, ...) (for the 64-bit code), then call Wow64GetContextThread and StackWalk64(IMAGE_FILE_MACHINE_I386, ...) (for the 32-bit code)

To get the kernel side stacks that Process Explorer also displays requires a driver and peeking into documented-but-not-officially-so structures.
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