Patching an App

**enteleky** · 01-08-2009

I am on a mac so I am sure this is going to be different, but I found an ASM line that I want to patch always to return 0. The line is below.

Code:

movzx   eax, byte ptr [eax+0C0h]

I was wondering if I could just do this...

Code:

movzx   eax, 0

And if that is how I would do it how can I permanently patch this?

**hypnodok** · 01-08-2009

On windows you would use Ollydbg.
You could always write an application that writes the opcodes for movz eax,0 to a memory location I guess.

**enteleky** · 01-08-2009

I could use IDA right?

**hypnodok** · 01-08-2009

IDA cant patch applications afaik.

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