1 files changed, 13 insertions, 10 deletions
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 186d0f40f43a..64eb97070d61 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -8629,6 +8629,19 @@ public class ActivityManagerService extends IActivityManager.Stub
             return -1;
         }
 
+        // Bail early if system is trying to hand out permissions directly; it
+        // must always grant permissions on behalf of someone explicit.
+        final int callingAppId = UserHandle.getAppId(callingUid);
+        if ((callingAppId == SYSTEM_UID) || (callingAppId == ROOT_UID)) {
+            if ("com.android.settings.files".equals(grantUri.uri.getAuthority())) {
+                // Exempted authority for cropping user photos in Settings app
+            } else {
+                Slog.w(TAG, "For security reasons, the system cannot issue a Uri permission"
+                        + " grant to " + grantUri + "; use startActivityAsCaller() instead");
+                return -1;
+            }
+        }
+
         final String authority = grantUri.uri.getAuthority();
         final ProviderInfo pi = getProviderInfoLocked(authority, grantUri.sourceUserId,
                 MATCH_DEBUG_TRIAGED_MISSING);
@@ -8724,16 +8737,6 @@ public class ActivityManagerService extends IActivityManager.Stub
 
         // Third...  does the caller itself have permission to access
         // this uri?
-        final int callingAppId = UserHandle.getAppId(callingUid);
-        if ((callingAppId == SYSTEM_UID) || (callingAppId == ROOT_UID)) {
-            if ("com.android.settings.files".equals(grantUri.uri.getAuthority())) {
-                // Exempted authority for cropping user photos in Settings app
-            } else {
-                Slog.w(TAG, "For security reasons, the system cannot issue a Uri permission"
-                        + " grant to " + grantUri + "; use startActivityAsCaller() instead");
-                return -1;
-            }
-        }
         if (!checkHoldingPermissionsLocked(pm, pi, grantUri, callingUid, modeFlags)) {
             // Require they hold a strong enough Uri permission
             if (!checkUriPermissionLocked(grantUri, callingUid, modeFlags)) {