Fix a bug where the Deletion Helper could not delete packages.

Bug: 31096000
Change-Id: I780cf74dc6750110024dcb0008b47879597f0156

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -1128,6 +1128,7 @@ public class PackageManagerService extends IPackageManager.Stub {
     final @NonNull String mRequiredInstallerPackage;
     final @NonNull String mRequiredUninstallerPackage;
     final @Nullable String mSetupWizardPackage;
+    final @Nullable String mStorageManagerPackage;
     final @NonNull String mServicesSystemSharedLibraryPackageName;
     final @NonNull String mSharedSystemSharedLibraryPackageName;
 
@@ -2469,6 +2470,9 @@ public class PackageManagerService extends IPackageManager.Stub {
             }
             mExpectingBetter.clear();
 
+            // Resolve the storage manager.
+            mStorageManagerPackage = getStorageManagerPackageName();
+
             // Resolve protected action filters. Only the setup wizard is allowed to
             // have a high priority filter for these actions.
             mSetupWizardPackage = getSetupWizardPackageName();
@@ -15513,6 +15517,12 @@ public class PackageManagerService extends IPackageManager.Stub {
                 callingUid == getPackageUid(mRequiredUninstallerPackage, 0, callingUserId)) {
             return true;
         }
+
+        // Allow storage manager to silently uninstall.
+        if (mStorageManagerPackage != null &&
+                callingUid == getPackageUid(mStorageManagerPackage, 0, callingUserId)) {
+            return true;
+        }
         return false;
     }
 
@@ -17728,6 +17738,22 @@ Slog.v(TAG, ":: stepped forward, applying functor at tag " + parser.getName());
         }
     }
 
+    private @Nullable String getStorageManagerPackageName() {
+        final Intent intent = new Intent(StorageManager.ACTION_MANAGE_STORAGE);
+
+        final List<ResolveInfo> matches = queryIntentActivitiesInternal(intent, null,
+                MATCH_SYSTEM_ONLY | MATCH_DIRECT_BOOT_AWARE | MATCH_DIRECT_BOOT_UNAWARE
+                        | MATCH_DISABLED_COMPONENTS,
+                UserHandle.myUserId());
+        if (matches.size() == 1) {
+            return matches.get(0).getComponentInfo().packageName;
+        } else {
+            Slog.e(TAG, "There should probably be exactly one storage manager; found "
+                    + matches.size() + ": matches=" + matches);
+            return null;
+        }
+    }
+
     @Override
     public void setApplicationEnabledSetting(String appPackageName,
             int newState, int flags, int userId, String callingPackage) {