am f2e39cb7: Merge "Verify /dev and /proc are not writable." into gingerbread

Merge commit 'f2e39cb78e09b20a17afbe24a0cdf6ca4cfc7009' into gingerbread-plus-aosp

* commit 'f2e39cb78e09b20a17afbe24a0cdf6ca4cfc7009':
  Verify /dev and /proc are not writable.