ACK: [CVE-2015-2925][Trusty][PATCH 0/2] Bind mount escape fixes

[Tim Gardner]

clean cherry-pick: [PATCH 1/2] dcache: Handle escaped paths in prepend_path
straightforward backport: [PATCH 2/2] vfs: Test for and handle paths 
that are unreachable from their mnt_root
-- 
Tim Gardner tim.gardner at canonical.com