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"Shared Code" Tutorial - Unexpected Information at

 
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KrisperKIA
How do I cheat?
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PostPosted: Tue Jul 28, 2020 8:15 pm    Post subject: "Shared Code" Tutorial - Unexpected Information at Reply with quote

I have gone over how to solve the shared code problem a few times, and I have a method for doing it by inserting the four base addresses into a dissector. I'm getting all relevant information that everybody else on the Internet seems to get, except for the values at offset 10. For everyone else, this is a 4-byte value indicating the team the person is on (1 or 2), but for me, it's a pointer. Why is this happening? Where is the team number stored in the memory? Below is a picture for reference.

EDIT: I just realized that the pointer 0010 drops down into several other addresses, the values for which are ??? for both of the computer players.

Please let me know any advice/pointers (haha) you might have. Thank you very much!



Shared Code Error.PNG
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 Filesize:  120.56 KB
 Viewed:  365 Time(s)

Shared Code Error.PNG


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ParkourPenguin
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PostPosted: Tue Jul 28, 2020 9:28 pm    Post subject: Reply with quote

CE has to guess what value type the data it reads is. Sometimes it guesses wrong (like here).

Add a new offset manually at 0x14 with type 4-byte (right click menu).

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Dark Byte
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PostPosted: Wed Jul 29, 2020 3:14 am    Post subject: Reply with quote

Just confirming, you are using the 64 bit tutorial right?
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KrisperKIA
How do I cheat?
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Joined: 28 Jul 2020
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PostPosted: Wed Jul 29, 2020 10:00 pm    Post subject: Reply with quote

Quote:
CE has to guess what value type the data it reads is. Sometimes it guesses wrong (like here).

Add a new offset manually at 0x14 with type 4-byte (right click menu).


That worked - thanks for the help! Just wondering, how did you know to pick an offset of 14? Was it arbitrary?

Quote:
Just confirming, you are using the 64 bit tutorial right?


Yes.
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ParkourPenguin
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PostPosted: Wed Jul 29, 2020 10:45 pm    Post subject: Reply with quote

Pointers take up 8 bytes of memory in a 64-bit process.

In the instances of the structure, the pointers at offset 0x10 have values "1001A0317", "100121E59", "20015BBBB", and "2000B25EC".
In little endian, values that take up multiple bytes are stored with the least significant bytes first. i.e. for the pointer whose value is "1001A0317", the array of bytes in memory would be "17 03 1A 00 01 00 00 00".

I don't know what the first 4 bytes of each pointer are, but the more significant 4 bytes (i.e. offsets 0x14 - 0x17 inclusive), when interpreted as 4-byte integers, are "1", "1", "2", and "2" respectively. These values are what I thought you expected to see.

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