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Code injection crashes [float operations]

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grasmanek94
Master Cheater

Reputation: 0

Joined: 03 Jun 2008
Posts: 283
Location: The Netherlands

Posted: Sun Sep 22, 2013 9:22 am Post subject: Code injection crashes [float operations]

I'm trying to inject some code which will make the "health"of all my weapons "100.0" (max).

So, I have found out what writes to the addresses:

Code:

"Shock2.exe"+54A43:
fstp dword ptr [ecx+04]
mov ecx,[esp]

so, It's a little confusing what's going on here but it seems the mov instruction set's the weapon durability, right? So I tried the following things:

Code:

newmem: //this is allocated memory, you have read,write,execute access
fstp dword ptr [ecx+04]
mov esp,42C80000 ; (float)100.0 in hex
mov ecx,[esp]
jmp exit

and

Code:

newmem: //this is allocated memory, you have read,write,execute access
fstp dword ptr [ecx+04]
mov ecx,42C80000
jmp exit

Which gives the resulting script:

Code:

[ENABLE]
alloc(newmem,2048)
label(returnhere)

newmem: //this is allocated memory, you have read,write,execute access
fstp dword ptr [ecx+04]
mov esp,42C80000
mov ecx,[esp]

jmp returnhere

"Shock2.exe"+54A43:
jmp newmem
nop
returnhere:
[DISABLE]
dealloc(newmem)
"Shock2.exe"+54A43:
fstp dword ptr [ecx+04]
mov ecx,[esp]

but it crashes as soon as the weapon health decreases, what's wrong here?

Dark Byte
Site Admin

Reputation: 471

Joined: 09 May 2003
Posts: 25858
Location: The netherlands

Posted: Sun Sep 22, 2013 9:55 am Post subject:

this code:

Code:

mov esp,42C80000
mov ecx,[esp]

will try to read the value at address 42c80000 and store that value into ECX

Try this instead:

Code:

fstp dword ptr [ecx+04]
mov [ecx+4],(float)100
mov ecx,[esp]

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grasmanek94
Master Cheater

Reputation: 0

Joined: 03 Jun 2008
Posts: 283
Location: The Netherlands

Posted: Mon Sep 23, 2013 6:32 am Post subject:

Yep, totally works

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