Help/Support Can u help me know how to write memory block in iOS

[Sameer Arora 0]

I am new to learning iOS environment

what i m trying to achieve is to write a block of memory using c-objective code

what i did used mprotect to change memory protection then run memcpy to write the address

but after 1-2 seconds of memory editing the app crashes 

now i m confused is the app detect is memory modified or the it’s basically iOS system level security to protect memory blocks