Lua_doString (WoW 3.1.1)

[jockel]

Heya,

I'm currently having huge problems of getting the Lua function doString to run.
I'm using C# and the fasm_managed library to inject asm code into the WoW process.

Here is the code I was using pre 3.1.1 which was working without any problems:

        void doString(string luaString)
        {
                int nSize = 0x100 + luaString.Length;
                uint cave = AllocateMemory(nSize);
                Writer.String(cave + 0x100, luaString);

                fasm.Clear();
                UpdateObjectManager();
                fasm.AddLine("push 0");
                fasm.AddLine("mov eax, " + (cave + 0x100));
                fasm.AddLine("push eax");
                fasm.AddLine("push eax");
                fasm.AddLine("call 0x0049AE70");
                fasm.AddLine("add esp, 0xC");
                fasm.AddLine("retn");
              
                SuspendThread();
                fasm.InjectAndExecute(codeCave);
                ResumeThread();
        }

Sadly since 3.1.1 it seems to be broken, I updated all offsets (lua_doString and the objectManager one).

Am I missing something?
Would be great to receive some hints...

[lanman92]

You need to update the TLS in the thread. Just add it to the top of your code and it should be working.

[Cursed]

TLS moved from 0x8 to 0x10 (just from my memory, I could be wrong)

[jockel]

Ding... stupid me
That was it 0x8 to 0x10, didn't recognized that this offset changed in IDA
Thanks.