The vold volume manager daemon on Android 3.0 and 2.x before 2.3.4 trusts messages that are received from a PF_NETLINK socket, which allows local users to execute arbitrary code and gain root privileges
android-developers.blogspot.co.uk/2011/05/android-31-platform-new-sdk-tools.html
c-skills.blogspot.co.uk/2011/04/yummy-yummy-gingerbreak.html
forum.xda-developers.com/showthread.php?t=1044765
productforums.google.com/forum/#!topic/mobile/yXzTapQlOso
www.cvedetails.com/cve/CVE-2011-1823/
android.googlesource.com/platform/system/core/+/android-2.3.4_r1
android.googlesource.com/platform/system/core/+/b620a0b1c7ae486e979826200e8e441605b0a5d6
android.googlesource.com/platform/system/netd/+/79b579c92afc08ab12c0a5788d61f2dd2934836f
android.googlesource.com/platform/system/vold/+/c51920c82463b240e2be0430849837d6fdc5352e