cryptohome: Create fresh destination directory for stateful recovery.
Contents of pre-existing directories can't be trusted because the
stateful file system is susceptible to manipulation by attackers
before boot.
BUG=chromium:766276
TEST=new unit test
Change-Id: Ie5b39c006b2d080ae7e981e7000fca4ebcebb14e
Reviewed-on: https://chromium-review.googlesource.com/674697
Commit-Ready: Mattias Nissler <mnissler@chromium.org>
Tested-by: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
2 files changed
