Protect runtime storage mount points.

We have a bunch of magic that mounts the correct view of storage
access based on the runtime permissions of an app, but we forgot to
protect the real underlying data sources; oops.

This series of changes just bumps the directory heirarchy one level
to give us /mnt/runtime which we can mask off as 0700 to prevent
people from jumping to the exposed internals.

Also add CTS tests to verify that we're protecting access to
internal mount points like this.

Bug: 22964288
Change-Id: I83f09f0423f4993e766273c50389dd29b1c50589

EmulatedVolume.cpp

@@ -61,9 +61,9 @@ status_t EmulatedVolume::doMount() {
         label = "emulated";
     }
 
-    mFuseDefault = StringPrintf("/mnt/runtime_default/%s", label.c_str());
-    mFuseRead = StringPrintf("/mnt/runtime_read/%s", label.c_str());
-    mFuseWrite = StringPrintf("/mnt/runtime_write/%s", label.c_str());
+    mFuseDefault = StringPrintf("/mnt/runtime/default/%s", label.c_str());
+    mFuseRead = StringPrintf("/mnt/runtime/read/%s", label.c_str());
+    mFuseWrite = StringPrintf("/mnt/runtime/write/%s", label.c_str());
 
     setInternalPath(mRawPath);
     setPath(StringPrintf("/storage/%s", label.c_str()));

PublicVolume.cpp

@@ -112,9 +112,9 @@ status_t PublicVolume::doMount() {
 
     mRawPath = StringPrintf("/mnt/media_rw/%s", stableName.c_str());
 
-    mFuseDefault = StringPrintf("/mnt/runtime_default/%s", stableName.c_str());
-    mFuseRead = StringPrintf("/mnt/runtime_read/%s", stableName.c_str());
-    mFuseWrite = StringPrintf("/mnt/runtime_write/%s", stableName.c_str());
+    mFuseDefault = StringPrintf("/mnt/runtime/default/%s", stableName.c_str());
+    mFuseRead = StringPrintf("/mnt/runtime/read/%s", stableName.c_str());
+    mFuseWrite = StringPrintf("/mnt/runtime/write/%s", stableName.c_str());
 
     setInternalPath(mRawPath);
     if (getMountFlags() & MountFlags::kVisible) {

VolumeManager.cpp

@@ -580,11 +580,11 @@ int VolumeManager::remountUid(uid_t uid, const std::string& mode) {
 
             std::string storageSource;
             if (mode == "default") {
-                storageSource = "/mnt/runtime_default";
+                storageSource = "/mnt/runtime/default";
             } else if (mode == "read") {
-                storageSource = "/mnt/runtime_read";
+                storageSource = "/mnt/runtime/read";
             } else if (mode == "write") {
-                storageSource = "/mnt/runtime_write";
+                storageSource = "/mnt/runtime/write";
             } else {
                 // Sane default of no storage visible
                 _exit(0);