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Is there a smarter/cleaner way I could have done this?

 
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Goat Engine
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PostPosted: Thu Apr 21, 2022 8:59 pm    Post subject: Is there a smarter/cleaner way I could have done this? Reply with quote
This works as is, but I was curious if this is the most efficient way to accomplish comparing a pointer with several offsets in AA? Isn't there some way to get it working with the whole pointer on a single line, or do we have to break it up like this for these situations?

Code:
push rsi
mov esi,["WWE2K19_x64.exe"+025B6BD0]
mov esi,[esi+398]
mov esi,[esi+B8]
mov esi,[esi+238]
mov esi,[esi+1AC]
cmp esi,#3212836864
pop rsi
jne exit
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ParkourPenguin
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PostPosted: Thu Apr 21, 2022 9:51 pm    Post subject: Reply with quote
If none of the nodes in a pointer path change, I think CE could accept this:
Code:
cmp [[[[["game.exe"+025B6BD0]+398]+B8]+238]+1AC],#3212836864
But this instruction assembles down to something like this:
Code:
cmp [741C5948AE58],#3212836864
The address in square brackets (e.g. 741C5948AE58) is the pointed-to address.
Obviously if any node in the pointer path changes this address becomes invalid and that instruction may crash the process. Even if it doesn't change, there's no guarantee the pointed-to address would be within 2 GiB for RIP-relative addressing, meaning you can't do that in a single instruction.

One alternative is to do an injection copy to get the pointed-to address.
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Csimbi
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PostPosted: Fri Apr 22, 2022 1:53 am    Post subject: Reply with quote
Yes, you have to break it up like that, but your code is broken.
There are no 32bit pointers in x64.

You are also assuming the pointers will be okay.
I'd add a try/except just in case.
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