- #INSOMNIAX FOR MAC NOT WORKING IN HIGH SIERRA PATCH#
- #INSOMNIAX FOR MAC NOT WORKING IN HIGH SIERRA CODE#
With some help from this article, I was able to prove that this was going to work on OS X too. It had never occurred to me that this was possible, despite it being obvious in hindsight.
#INSOMNIAX FOR MAC NOT WORKING IN HIGH SIERRA CODE#
The first thing that jumped out at me in this story was the part about sending machine code over the network to be executed by the game. That being said, let’s get started! First: You Can Run Arbitrary Machine Code at Runtime? I hadn’t written much assembly before I started this project and I’m sure it shows. I want to caveat the entire article by saying that this post is going to contain a lot of terrible assembly. So this is the story of how I recreated this on OS X. This is the polar opposite of that, and I want to get me some of it. Most of my day at work is spent sorting out problems in huge codebases made up of abstractions layered over other abstractions layered over third party libraries and legacy code. Suffice to say that this story is not an example of what modern day game development is like, but I think that’s what makes it so appealing. Takeaways: Include patching code in your shipped game, and don't use unbounded strcpy. Payload downloads and restores stomped miscellaneous data Game jumps to bootstrap code pointed to by handlerĦ. Overflow EULA buffer, miscellaneous data, callback handler pointerĤ. So we mutated the compiled code such that it contained no zero bytes and had a carefully crafted piece of bootstrap asm to un-mutate it.Ģ. Our string contained code which often contains 0 bytes. And strcpy ends when it finds a 0 byte (which is usually the end of the string). One complication is that the EULA text is copied with strcpy. Once that was done things were back to normal and the actual patching work could be done. Valuable data existed between the real end of the EULA buffer and the overwritten global, so the first job of the payload code was to restore this trashed data. The address was a pointer to some payload code that was stored earlier in the EULA data.
Once this handler was installed, we could send the network packet to cause a jump to the address in the overwritten global. This variable happened to be the function callback handler for a specific network packet. We exploited this fact to cause the EULA download to overflow the static buffer far enough to also overwrite a known global variable.
This buffer is filled from the server without checking that the size is within the buffer's capacity. This is an ascii string stored in a static buffer. The game downloads and displays an End User License Agreement each time it's launched.
#INSOMNIAX FOR MAC NOT WORKING IN HIGH SIERRA PATCH#
Ratchet and Clank: Up Your Arsenal was an online title that shipped without the ability to patch either code or data.
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