Android Binder Use-After-Free Exploit

This module exploits CVE-2019-2215, which is a use-after-free in Binder in the
Android kernel. The bug is a local privilege escalation vulnerability that
allows for a full compromise of a vulnerable device. If chained with a browser
renderer exploit, this bug could fully compromise a device through a malicious
website.
The freed memory is replaced with an iovec structure in order to leak a pointer
to the task_struct. Finally the bug is triggered again in order to overwrite
the addr_limit, making all memory (including kernel memory) accessible as part
of the user-space memory range in our process and allowing arbitrary reading
and writing of kernel memory.