MsiUseFeature() returning INSTALLSTATE_BROKEN is tolerated in non-elevated process now

MsiUseFeature/Main.cpp

@@ -47,7 +47,32 @@ static int MsiUseFeature()
     }
 
     // Perform the Microsoft Installer's feature completeness check.
-    if (MsiUseFeatureW(_L(PRODUCT_VERSION_GUID), pwcArglist[1]) != INSTALLSTATE_LOCAL) {
+    switch (MsiUseFeatureW(_L(PRODUCT_VERSION_GUID), pwcArglist[1])) {
+    case INSTALLSTATE_LOCAL:
+        // All components of the feature were checked and present.
+        break;
+
+    case INSTALLSTATE_BROKEN: {
+        // Some of the components are reported missing.
+        //
+        // Unfortunately, the feature state is falsely reported as broken, when MsiUseFeature() lacks privilege
+        // to check the presence of at least one component installed in an inaccessible folder or registry key.
+        // If our process is not elevated and feature does contain such components, this is the expected result.
+        // However, even when we are "Run as Administrator", this does not guarantee we can access all the
+        // components. Some might be restricted from Administrators group aswell.
+        win_handle token;
+        TOKEN_ELEVATION Elevation; DWORD dwSize;
+        if (OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token) &&
+            GetTokenInformation(token, TokenElevation, &Elevation, sizeof(Elevation), &dwSize) &&
+            !Elevation.TokenIsElevated)
+        {
+            // We are not elevated.
+            OutputDebugStr(_T("The feature is reported broken and the elevation is required for a more reliable test. Silently assuming the feature is complete.\n"));
+            break;
+        }
+    }
+
+    default:
         OutputDebugStr(_T("The feature is not installed locally.\n"));
         return 2;
     }

lib/WinStd

@@ -1 +1 @@
-Subproject commit b09610fd5f9168cb70252e7a8227995ba931f268
+Subproject commit 750f40fada90ce22e8aceb4bf2775be8478bf63b