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Public volumes belong to a single user.

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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
This commit is contained in:
Jeff Sharkey
2016-10-31 14:33:49 -06:00
committed by Jeff Sharkey
parent e97969b4d0
commit 8b38d083c4
1 changed files with 2 additions and 1 deletions
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3
packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
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@@ -161,7 +161,8 @@ public class ExternalStorageProvider extends DocumentsProvider {
final VolumeInfo privateVol = mStorageManager.findPrivateForEmulated(volume);
title = mStorageManager.getBestVolumeDescription(privateVol);
}
} else if (volume.getType() == VolumeInfo.TYPE_PUBLIC) {
} else if (volume.getType() == VolumeInfo.TYPE_PUBLIC
&& volume.getMountUserId() == userId) {
rootId = volume.getFsUuid();
title = mStorageManager.getBestVolumeDescription(volume);
} else {