diff --git a/.gitignore b/.gitignore
index 8447db2..f63c153 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,6 +51,7 @@
 stamp-h1
 tdfx.kld
 via.kld
+tests/auth
 tests/dristat
 tests/drmstat
 tests/getclient
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 38a07a3..e846efb 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -15,7 +15,8 @@
 
 LDADD = libdrmtest.la
 
-TESTS = openclose \
+TESTS = auth \
+	openclose \
 	getversion \
 	getclient \
 	updatedraw
diff --git a/tests/auth.c b/tests/auth.c
new file mode 100644
index 0000000..45265d6
--- /dev/null
+++ b/tests/auth.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright © 2007 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include <limits.h>
+#include "drmtest.h"
+
+enum auth_event {
+	SERVER_READY,
+	CLIENT_MAGIC,
+	CLIENT_DONE,
+};
+
+int commfd[2];
+
+static void wait_event(int pipe, enum auth_event expected_event)
+{
+	int ret;
+	enum auth_event event;
+	unsigned char in;
+
+	ret = read(commfd[pipe], &in, 1);
+	if (ret == -1)
+		err(1, "read error");
+	event = in;
+
+	if (event != expected_event)
+		errx(1, "unexpected event: %d\n", event);
+}
+
+static void
+send_event(int pipe, enum auth_event send_event)
+{
+	int ret;
+	unsigned char event;
+
+	event = send_event;
+	ret = write(commfd[pipe], &event, 1);
+	if (ret == -1)
+		err(1, "failed to send event %d", event);
+}
+
+static void client()
+{
+	struct drm_auth auth;
+	int drmfd, ret;
+
+	/* XXX: Should make sure we open the same DRM as the master */
+	drmfd = drm_open_any();
+
+	wait_event(0, SERVER_READY);
+
+	/* Get a client magic number and pass it to the master for auth. */
+	auth.magic = 0; /* Quiet valgrind */
+	ret = ioctl(drmfd, DRM_IOCTL_GET_MAGIC, &auth);
+	if (ret == -1)
+		err(1, "Couldn't get client magic");
+	send_event(0, CLIENT_MAGIC);
+	ret = write(commfd[0], &auth.magic, sizeof(auth.magic));
+	if (ret == -1)
+		err(1, "Couldn't write auth data");
+
+	/* Signal that the client is completely done. */
+	send_event(0, CLIENT_DONE);
+}
+
+static void server()
+{
+	int drmfd, ret;
+	struct drm_auth auth;
+
+	drmfd = drm_open_any_master();
+
+	auth.magic = 0xd0d0d0d0;
+	ret = ioctl(drmfd, DRM_IOCTL_AUTH_MAGIC, &auth);
+	if (ret != -1 || errno != EINVAL)
+		errx(1, "Authenticating bad magic succeeded\n");
+
+	send_event(1, SERVER_READY);
+
+	wait_event(1, CLIENT_MAGIC);
+	ret = read(commfd[1], &auth.magic, sizeof(auth.magic));
+	if (ret == -1)
+		err(1, "Failure to read client magic");
+
+	ret = ioctl(drmfd, DRM_IOCTL_AUTH_MAGIC, &auth);
+	if (ret == -1)
+		err(1, "Authenticating bad magic succeeded\n");
+
+	wait_event(1, CLIENT_DONE);
+}
+
+/**
+ * Checks DRM authentication mechanisms.
+ */
+int main(int argc, char **argv)
+{
+	int ret;
+
+	ret = pipe(commfd);
+	if (ret == -1)
+		err(1, "Couldn't create pipe");
+
+	ret = fork();
+	if (ret == -1)
+		err(1, "failure to fork client");
+	if (ret == 0)
+		client();
+	else
+		server();
+
+	return 0;
+}
+