Mac ProjFS kext: Denies access when provider does not respond

If for some reason the provider does not respond to a kernel request originating from an authorisation check callback, we now deny that authorisation.
microsoft · Aug 5, 2019 · a30c92b · a30c92b
1 parent 06f173a
commit a30c92b
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/ProjFS.Mac/PrjFSKext/ProviderMessaging.cpp b/ProjFS.Mac/PrjFSKext/ProviderMessaging.cpp
@@ -179,14 +179,15 @@ bool ProviderMessaging_TrySendRequestAndWaitForResponse(
     {
         if (0 != sendError)
         {
-            // TODO: appropriately handle unresponsive providers
-            *kauthResult = KAUTH_RESULT_DEFER;
+            // If message delivery fails, block the operation to avoid missed messages in the provider.
+            *kauthResult = KAUTH_RESULT_DENY;
         }
         else
         {
             while (!message.receivedResult &&
                    !s_isShuttingDown)
             {
+                // TODO: appropriately handle unresponsive providers
                 Mutex_Sleep(5, &message, &s_outstandingMessagesMutex);
             }