Prevent sharesheet from previewing unowned URIs [RESTRICT AUTOMERGE] (corrected)

This is the corrected cherry-pick of
2a08fce4eb from master.

Bug: 261036568
Test: manually via supplied tool (see bug)
Change-Id: I1ac57c8eb2f509b19c278aacb8e88772095854f7
Merged-In: I83e93c373538460e38ec17f1fd8e39d7aea95c10

core/java/com/android/internal/app/ChooserActivity.java

@@ -21,6 +21,7 @@ import static android.app.admin.DevicePolicyResources.Strings.Core.RESOLVER_CANT
 import static android.app.admin.DevicePolicyResources.Strings.Core.RESOLVER_CANT_SHARE_WITH_PERSONAL;
 import static android.app.admin.DevicePolicyResources.Strings.Core.RESOLVER_CANT_SHARE_WITH_WORK;
 import static android.app.admin.DevicePolicyResources.Strings.Core.RESOLVER_CROSS_PROFILE_BLOCKED_TITLE;
+import static android.content.ContentProvider.getUserIdFromUri;
 import static android.stats.devicepolicy.DevicePolicyEnums.RESOLVER_EMPTY_STATE_NO_SHARING_TO_PERSONAL;
 import static android.stats.devicepolicy.DevicePolicyEnums.RESOLVER_EMPTY_STATE_NO_SHARING_TO_WORK;
 
@@ -161,6 +162,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.function.Supplier;
+import java.util.stream.Collectors;
 
 /**
  * The Chooser Activity handles intent resolution specifically for sharing intents -
@@ -1395,7 +1397,7 @@ public class ChooserActivity extends ResolverActivity implements
 
             ImageView previewThumbnailView = contentPreviewLayout.findViewById(
                     R.id.content_preview_thumbnail);
-            if (previewThumbnail == null) {
+            if (!validForContentPreview(previewThumbnail)) {
                 previewThumbnailView.setVisibility(View.GONE);
             } else {
                 mPreviewCoord = new ContentPreviewCoordinator(contentPreviewLayout, false);
@@ -1425,6 +1427,10 @@ public class ChooserActivity extends ResolverActivity implements
         String action = targetIntent.getAction();
         if (Intent.ACTION_SEND.equals(action)) {
             Uri uri = targetIntent.getParcelableExtra(Intent.EXTRA_STREAM);
+            if (!validForContentPreview(uri)) {
+                contentPreviewLayout.setVisibility(View.GONE);
+                return contentPreviewLayout;
+            }
             imagePreview.findViewById(R.id.content_preview_image_1_large)
                     .setTransitionName(ChooserActivity.FIRST_IMAGE_PREVIEW_TRANSITION_NAME);
             mPreviewCoord.loadUriIntoView(R.id.content_preview_image_1_large, uri, 0);
@@ -1434,7 +1440,7 @@ public class ChooserActivity extends ResolverActivity implements
             List<Uri> uris = targetIntent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
             List<Uri> imageUris = new ArrayList<>();
             for (Uri uri : uris) {
-                if (isImageType(resolver.getType(uri))) {
+                if (validForContentPreview(uri) && isImageType(resolver.getType(uri))) {
                     imageUris.add(uri);
                 }
             }
@@ -1544,9 +1550,16 @@ public class ChooserActivity extends ResolverActivity implements
         String action = targetIntent.getAction();
         if (Intent.ACTION_SEND.equals(action)) {
             Uri uri = targetIntent.getParcelableExtra(Intent.EXTRA_STREAM);
+            if (!validForContentPreview(uri)) {
+                contentPreviewLayout.setVisibility(View.GONE);
+                return contentPreviewLayout;
+            }
             loadFileUriIntoView(uri, contentPreviewLayout);
         } else {
             List<Uri> uris = targetIntent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
+            uris = uris.stream()
+                    .filter(ChooserActivity::validForContentPreview)
+                    .collect(Collectors.toList());
             int uriCount = uris.size();
 
             if (uriCount == 0) {
@@ -1605,6 +1618,24 @@ public class ChooserActivity extends ResolverActivity implements
         }
     }
 
+    /**
+     * Indicate if the incoming content URI should be allowed.
+     *
+     * @param uri the uri to test
+     * @return true if the URI is allowed for content preview
+     */
+    private static boolean validForContentPreview(Uri uri) throws SecurityException {
+        if (uri == null) {
+            return false;
+        }
+        int userId = getUserIdFromUri(uri, UserHandle.USER_CURRENT);
+        if (userId != UserHandle.USER_CURRENT && userId != UserHandle.myUserId()) {
+            Log.e(TAG, "dropped invalid content URI belonging to user " + userId);
+            return false;
+        }
+        return true;
+    }
+
     @VisibleForTesting
     protected boolean isImageType(String mimeType) {
         return mimeType != null && mimeType.startsWith("image/");