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Replacing with NOPs creates an undefined behavior

 
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Pokiaka
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PostPosted: Tue Jan 22, 2013 11:24 pm    Post subject: Replacing with NOPs creates an undefined behavior Reply with quote
I'm working on Unreal Tournament 3 (nosTeam release).

I found the instruction that decreases the HP, but when I replaced it with NOPs, the game randomly crashed (after shooting a weapon, or getting on an hover-board).

Later I did the same thing for the ammo and it seemed to work fine, but when I've exited the match and went to the menu the game crashed.

The instruction I replaced was a mov and a sub into a memory address so it seems very strange to me that the game would notice any difference.

What would be the best way to solve with this problem?
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Dark Byte
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PostPosted: Wed Jan 23, 2013 3:22 am    Post subject: Reply with quote
That code is also used by a lot of other things (It's the "set address to value" function)
You need to do a more advanced code injection that checks if the thing being affected is in fact health or not.
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Pokiaka
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Joined: 09 Jul 2011
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PostPosted: Thu Jan 24, 2013 5:40 am    Post subject: Reply with quote
Dark Byte wrote:
That code is also used by a lot of other things (It's the "set address to value" function)
You need to do a more advanced code injection that checks if the thing being affected is in fact health or not.


Ah, I thought exactly about what you said but changed my mind because changing an address seemed so harmless. Thanks for letting me know.

I'll give it a go.
Is there a feature in CE that could help speeding up the process? (I honestly don't expect to find one tho, seems to specific)
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