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Thread suddenly throws an exception?

 
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Corruptor
Advanced Cheater
Reputation: 3

Joined: 10 Aug 2011
Posts: 82
PostPosted: Wed Aug 10, 2011 8:35 am    Post subject: Thread suddenly throws an exception? Reply with quote
first of all, sorry 4 my english.

BTT:ive been fooling around with a game called "Battlefront" (some shooter). By now, this forum helped me a lot finding a lot of cheats (health, ammo, yet pack, infinite mines etc etc).
I found the adress of the text (w-char) currently entered into the chat message box and thought about a "cheat" or better a hotkey that automatically sends some Text in the chat. Using the "find out what accesses this adress"-function i found a function that is executet 2 times (lol?) everytime i send a message to the chat.
For this "cheat" i probably have to call this function mannually using a thread. Heres the code i used (dont ask me about the nops Very Happy) :
Code:
[ENABLE]
//code from here to '[DISABLE]' will be used to enable the cheat
alloc(mycode,2048)
CREATETHREAD(mycode)

mycode:

call 00402890

ret

 
 
[DISABLE]
//code from here till the end of the code will be used to disable the cheat
nop
ret


well, everytime i execute this script, the game crashes. A breakpoint at this adress tells me this: when it finally reaches these lines
Code:
mov si,[edi]
test si,si
(to be more precise, the step from mov si,[edi] to test si,si) (which is totaly nothing special at all), the programm suddenly jumps (no testing, it jumps) to the thery end in a section titled as "KiUserExceptionDispatcher", and a few lines later (zwRaiseException or something like that) the game finally crashes.

And now im confused and have these Questions:
How can that happen?
What is the KiUserExceptionDispatcher?
if possible, any ideas to fix that?
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Dark Byte
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Joined: 09 May 2003
Posts: 25930
Location: The netherlands
PostPosted: Wed Aug 10, 2011 8:44 am    Post subject: Reply with quote
are you sure the function at 00402890 requires no parameters ?
Missing parameters, or wrong registervalues (in c++ ecx must point to the current class) can often cause problems
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Corruptor
Advanced Cheater
Reputation: 3

Joined: 10 Aug 2011
Posts: 82
PostPosted: Wed Aug 10, 2011 11:33 am    Post subject: Reply with quote
Assambler functions can have parameters? Shocked
Is there a way to find and/or emulate them?
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