Fix issue #2845673: android:exported="false" is not obeyed

Thou shall obey.

Change-Id: I09f163a0db7cc9189c8d7f5116cc8ca9d4f7a76c

core/java/android/app/ActivityThread.java

@@ -3298,10 +3298,6 @@ public final class ActivityThread {
             Slog.e(TAG, "Failed to find provider info for " + name);
             return null;
         }
-        if (holder.permissionFailure != null) {
-            throw new SecurityException("Permission " + holder.permissionFailure
-                    + " required for provider " + name);
-        }
 
         IContentProvider prov = installProvider(context, holder.provider,
                 holder.info, true);

core/java/android/app/IActivityManager.java

@@ -326,28 +326,19 @@ public interface IActivityManager extends IInterface {
     /** Information you can retrieve about a particular application. */
     public static class ContentProviderHolder implements Parcelable {
         public final ProviderInfo info;
-        public final String permissionFailure;
         public IContentProvider provider;
         public boolean noReleaseNeeded;
 
         public ContentProviderHolder(ProviderInfo _info) {
             info = _info;
-            permissionFailure = null;
         }
 
-        public ContentProviderHolder(ProviderInfo _info,
-                String _permissionFailure) {
-            info = _info;
-            permissionFailure = _permissionFailure;
-        }
-        
         public int describeContents() {
             return 0;
         }
 
         public void writeToParcel(Parcel dest, int flags) {
             info.writeToParcel(dest, 0);
-            dest.writeString(permissionFailure);
             if (provider != null) {
                 dest.writeStrongBinder(provider.asBinder());
             } else {
@@ -369,7 +360,6 @@ public interface IActivityManager extends IInterface {
 
         private ContentProviderHolder(Parcel source) {
             info = ProviderInfo.CREATOR.createFromParcel(source);
-            permissionFailure = source.readString();
             provider = ContentProviderNative.asInterface(
                 source.readStrongBinder());
             noReleaseNeeded = source.readInt() != 0;

core/java/android/content/ContentProvider.java

@@ -86,6 +86,7 @@ public abstract class ContentProvider implements ComponentCallbacks {
     private String mReadPermission;
     private String mWritePermission;
     private PathPermission[] mPathPermissions;
+    private boolean mExported;
 
     private Transport mTransport = new Transport();
 
@@ -257,9 +258,9 @@ public abstract class ContentProvider implements ComponentCallbacks {
             final Context context = getContext();
             final String rperm = getReadPermission();
             final int pid = Binder.getCallingPid();
-            if (rperm == null
+            if (mExported && (rperm == null
                     || context.checkPermission(rperm, pid, uid)
-                    == PackageManager.PERMISSION_GRANTED) {
+                    == PackageManager.PERMISSION_GRANTED)) {
                 return;
             }
             
@@ -303,9 +304,9 @@ public abstract class ContentProvider implements ComponentCallbacks {
             final Context context = getContext();
             final String wperm = getWritePermission();
             final int pid = Binder.getCallingPid();
-            if (wperm == null
+            if (mExported && (wperm == null
                     || context.checkPermission(wperm, pid, uid)
-                    == PackageManager.PERMISSION_GRANTED) {
+                    == PackageManager.PERMISSION_GRANTED)) {
                 return true;
             }
             
@@ -786,6 +787,7 @@ public abstract class ContentProvider implements ComponentCallbacks {
                 setReadPermission(info.readPermission);
                 setWritePermission(info.writePermission);
                 setPathPermissions(info.pathPermissions);
+                mExported = info.exported;
             }
             ContentProvider.this.onCreate();
         }