CreateRemoteThread returns ERROR_ACCESS_DENIED (5) on win7 64 bit

Question

How can i fix this problem? the code works fine as I tested it on a 32 bit computer but my 64 bit computer returns that error with getlasterror();

what can i do to fix this?

Answer 1

Partial info:

When I was working with CreateRemoteThread on Win2000, everything was working fine except for the cases when I was starting remote threads in the processes that belonged to different terminal server sessions. On Win2003 (and on) all system processes work in TS session 0 that is different from the interactive session that you are currently logged in. At that time I has not managed to solve the TS session boundary problem. This is what you might need to check first.

It is more likely that this is not a 32/64 bit problem but some sort of security problem that requires special privileges and/or permissions.

Answer 2

I'm going to guess that your target process is a Managed executable, compiled for "Any CPU"...

If so, when you launch that exe on 64-bit Windows, it will JIT compile to 64-bit code, and thus become a 64-bit process.

You can then not call CreateRemoteThread on it, from a 32-bit process.

The same Managed exe launched on 32-bit Windows would JIT to 32-bit code, and therefore would work.

If that's the case, and you are the author of the Managed exe in question, rebuild it for x86.