lock a dll to block dll calls

[FireFox]

Hi,

Is it possible to lock a Windows dll (like user32) to block any function call from other applications?

Thanks for anyhelp.

Br, FireFox.

[rodent1]

if the dll can be unregistered, you could use the command regsvr32 /u thedll.dll, though if you're talking about a Windows dll, you may end up blocking more calls than you'd like to

Edited November 13, 2012 by rodent1

[Jos]

How would unregistering help avoiding calling it directly?

[FireFox]

if the dll can be unregistered, you could use the command regsvr32 /u thedll.dll, though if you're talking about a Windows dll, you may end up blocking more calls than you'd like to

It's maybe a solution, but I want it to be non-unlockable by another app.

@Jos

Any trick?

Edited November 13, 2012 by FireFox

[water]

Can you describe why you want to block a Dll?

[FireFox]

I'm working on an anti cheat project and I need to control the most possible things on the computer, including (it would be perfect) the dlls.

Br, FireFox.

[JohnOne]

Throughout the runtime of your PC, the system will need to access it's dll files.

Even if you did find a way to block access to them, I'm 100% certain you would hard crash it.

[BrewManNH]

Plus, if you did find a way to do this, you'd be violating the rules of the forum and we wouldn't be able to help with it.

This screams malware, even if what you want to do might not be malicious, the concept would be definitely usable as malware and thus would violate the rules.

[FireFox]

Throughout the runtime of your PC, the system will need to access it's dll files.

Even if you did find a way to block access to them, I'm 100% certain you would hard crash it.

Well, it seems the only way to do it is by drivers like the GameGuard is doing when blocking (something like this) winapi functions for some applications like Skype (e.g of errors : Could not get window handle; create device context)

[JohnOne]

I imagine they protect their own dlls, windows and processes rather than OS dlls.

I don't know much about it to be honest, beyond it would destabilise <sp> the OS.

[FireFox]

I imagine they protect their own dlls, windows and processes rather than OS dlls.

I don't know much about it to be honest, beyond it would destabilise <sp> the OS.

Not that much. There is some applications that you can not run unless it craches. Meaning that it blocks something.

I'm almost sure it blocks (in a certain way) OS dlls because to get a window handle I don't see another way to do it.

[JohnOne]

I'd be willing to bet that you would have problems getting a handle to a window it is guarding

But all other windows would be fine. That is because it would be manipulating the guarded

window and its parent process.

[Melba23]

FireFox,

I am afraid this is not something we want to discuss here, sorry.

M23