This post can be considered both the part 2 of the previous "Dynamically inject a shared library into a running process on Android/ARM" and a proof of concept of the same, namely what can be done with library injection on Android. TL;DR I've updated the source code of the arminject project on github adding a library that once injected into a process will

If you're familiar with Windows runtime code injection you probably know the great API CreateRemoteThread which lets us force an arbitrary running process to call LoadLibrary and load a DLL into its address space, this technique called DLL Injection is often used to perform user space API hooking, you can find a good post about it on Gianluca Braga's blog.