tests: add a test causing SIGBUS to the compositor

This tests the wl_shm buffer access wrappers, that are supposed to catch
the invalid accesses to a memory-mapped file beyond EOF.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

tests/Makefile.am

@@ -11,6 +11,7 @@ module_tests =				\
 weston_test = weston-test.la
 
 weston_tests =				\
+	bad_buffer.weston		\
 	keyboard.weston			\
 	event.weston			\
 	button.weston			\
@@ -97,6 +98,9 @@ weston_test_client_libs =		\
 	../shared/libshared.la		\
 	libshared-test.la
 
+bad_buffer_weston_SOURCES = bad-buffer-test.c $(weston_test_client_src)
+bad_buffer_weston_LDADD = $(weston_test_client_libs)
+
 keyboard_weston_SOURCES = keyboard-test.c $(weston_test_client_src)
 keyboard_weston_LDADD = $(weston_test_client_libs)
 

tests/bad-buffer-test.c

@@ -0,0 +1,77 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ * Copyright © 2013 Collabora, Ltd.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "../shared/os-compatibility.h"
+#include "weston-test-client-helper.h"
+
+/* tests, that attempt to crash the compositor on purpose */
+
+static struct wl_buffer *
+create_bad_shm_buffer(struct client *client, int width, int height)
+{
+	struct wl_shm *shm = client->wl_shm;
+	int stride = width * 4;
+	int size = stride * height;
+	struct wl_shm_pool *pool;
+	struct wl_buffer *buffer;
+	int fd;
+
+	fd = os_create_anonymous_file(size);
+	assert(fd >= 0);
+
+	pool = wl_shm_create_pool(shm, fd, size);
+	buffer = wl_shm_pool_create_buffer(pool, 0, width, height, stride,
+					   WL_SHM_FORMAT_ARGB8888);
+	wl_shm_pool_destroy(pool);
+
+	/* Truncate the file to a small size, so that the compositor
+	 * will access it out-of-bounds, and hit SIGBUS.
+	 */
+	assert(ftruncate(fd, 12) == 0);
+	close(fd);
+
+	return buffer;
+}
+
+FAIL_TEST(test_truncated_shm_file)
+{
+	struct client *client;
+	struct wl_buffer *bad_buffer;
+	struct wl_surface *surface;
+	int frame;
+
+	client = client_create(46, 76, 111, 134);
+	assert(client);
+	surface = client->surface->wl_surface;
+
+	bad_buffer = create_bad_shm_buffer(client, 200, 200);
+
+	wl_surface_attach(surface, bad_buffer, 0, 0);
+	wl_surface_damage(surface, 0, 0, 200, 200);
+	frame_callback_set(surface, &frame);
+	wl_surface_commit(surface);
+	frame_callback_wait(client, &frame);
+}