Update( May 28 2015) The porting work of the PaX patch already done. We tested it with Towel & KINGROOT. The result as expected: they all failed to root the Android 5.0.2 with kernel code base from 2014. Perhaps, we might try to make GRSEC & RBAC into the Android in the future……… armv7-nexus7-grsec PaX/Grsecurity patch for Nexus7, which the original version is 3.4 kernel based with a bunch of backport features and fixes.