nullpointer detection

Author: AllanZyne

source/loader/layers/sanitizer/asan_interceptor.cpp

@@ -425,6 +425,18 @@ ur_result_t DeviceInfo::allocShadowMemory(ur_context_handle_t Context) {
     }
     getContext()->logger.info("ShadowMemory(Global): {} - {}",
                               (void *)ShadowOffset, (void *)ShadowOffsetEnd);
+
+    // Set shadow memory for null pointer
+    ManagedQueue Queue(Context, Handle);
+
+    auto DI = getContext()->interceptor->getDeviceInfo(Handle);
+    auto URes =
+        enqueueMemSetShadow(Context, DI, Queue, 0, 1, kNullPointerRedzoneMagic);
+    if (URes != UR_RESULT_SUCCESS) {
+        getContext()->logger.error("enqueueMemSetShadow(NullPointerRZ): {}",
+                                   URes);
+        return URes;
+    }
     return UR_RESULT_SUCCESS;
 }