Binder is based on OpenBinder and is an important part of the Android operating system. Binder is built on the Binder driver in the Linux kernel. All the inner-process communication that involves Binder needs to communicate with the Binder driver to transfer data. Due to the important role the Binder driver plays in the entire Android system, it has always been one of the focuses of Android security research.

http://blogs.360.cn/post/Binder_Kernel_Vul_EN.html