3 files changed, 52 insertions, 0 deletions
diff --git a/build/win32/crashinjectdll/crashinjectdll.cpp b/build/win32/crashinjectdll/crashinjectdll.cpp
new file mode 100644
index 0000000000..7ee7e6812d
--- /dev/null
+++ b/build/win32/crashinjectdll/crashinjectdll.cpp
@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <windows.h>
+
+// make sure we only ever spawn one thread
+DWORD tid = -1;
+
+DWORD WINAPI CrashingThread(LPVOID lpParameter) {
+  // not a very friendly DLL
+  volatile int* x = (int*)0x0;
+  *x = 1;
+  return 0;
+}
+
+BOOL WINAPI DllMain(HANDLE hinstDLL, DWORD dwReason, LPVOID lpvReserved) {
+  if (tid == (DWORD)-1)
+    // we have to crash on another thread because LoadLibrary() will
+    // catch memory access errors and return failure to the calling process
+    CreateThread(nullptr,         // default security attributes
+                 0,               // use default stack size
+                 CrashingThread,  // thread function name
+                 nullptr,         // argument to thread function
+                 0,               // use default creation flags
+                 &tid);           // returns the thread identifier
+  return TRUE;
+}
diff --git a/build/win32/crashinjectdll/crashinjectdll.def b/build/win32/crashinjectdll/crashinjectdll.def
new file mode 100644
index 0000000000..d1ea5602da
--- /dev/null
+++ b/build/win32/crashinjectdll/crashinjectdll.def
@@ -0,0 +1,7 @@
+;+# This Source Code Form is subject to the terms of the Mozilla Public
+;+# License, v. 2.0. If a copy of the MPL was not distributed with this
+;+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+LIBRARY crashinjectdll
+EXPORTS
+     DllMain
diff --git a/build/win32/crashinjectdll/moz.build b/build/win32/crashinjectdll/moz.build
new file mode 100644
index 0000000000..ff113f61e6
--- /dev/null
+++ b/build/win32/crashinjectdll/moz.build
@@ -0,0 +1,16 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+SOURCES += [
+    "crashinjectdll.cpp",
+]
+
+SharedLibrary("crashinjectdll")
+
+DEFFILE = "crashinjectdll.def"
+
+USE_STATIC_LIBS = True
+NO_PGO = True