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This probably has a few consequences, not least that the region of ports within which it searches for the corruption is likely shifted so the corruption might succeed but it'll keep going, eventually panicking.
struct ipc_kmsg is a header for a variable sized structure; I explain it here: https://googleprojectzero.blogspot.com/2017/04/exception-oriented-exploitation-on-ios.html … that's why it looks like I'm reading off the end of it; the mach message body is actually aligned to the end of the allocation.
Thanks for pointing it out! I stared at the "ipc_kmsg_get()" for a little more while and finally understood the weird layout and added the correct description in the annotation. Thanks again for sharing the amazing exploits & techniques, you are the Best!! 
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