commit d9f38b167f9364671ec2755d75c911757faf641f
author Jeff Sharkey <jsharkey@android.com> Mon Oct 31 14:33:49 2016 -0600
committer gitbuildkicker <android-build@google.com> Wed Nov 30 10:49:09 2016 -0800
tree d276c2f99e46e70932d0a4bdab911905c8af12b4
parent 20626d4909078d17fce6ab0f0bf5ea6150c5e9f5

Public volumes belong to a single user.

When a public (vfat) device is inserted, it's strongly associated
with the current foreground user, and no other users should be able
to access it, since otherwise that would be a cross-user data leak.

To use the device under a different user, switch users and then
eject/remount the device.

Test: verified user isolation of USB drive
Bug: 32523490
Change-Id: I590c791996f1fea8d78f625dc942d149f1f41614
(cherry picked from commit 8b38d083c42e2706e1ff5a1410fa61d1f5dea3f5)