fix su when root enabled in img

su: Fix crash due to invalid file descriptor

switch from stat to fstat

replace strncpy with strlcpy + truncation checks

Merge "remove redundant checks" into cm-13.0

remove redundant checks

fix adb-only su support

Merge "replace insecure uid spoofing code" into cm-13.0

replace insecure uid spoofing code

daemon: Validate the socket caller's requested FDs

su: Remove dead code

su: update app ops index

su: Don't build statically

su: Fix implicit declarations

su: allow init to automatically restart daemon