libfdt: Add fdt_check_full() functionsafety

This new function implements a complete and thorough check of an fdt blob's
structure.  Given a buffer containing an fdt, it should return 0 only if
the fdt within is structurally sound in all regards.  It doesn't check
anything about the blob's contents (i.e. the actual values of the nodes and
properties), of course.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 63 insertions, 0 deletions

diff --git a/tests/check_full.c b/tests/check_full.c
new file mode 100644
index 0000000..04c0bc1
--- /dev/null
+++ b/tests/check_full.c
@@ -0,0 +1,63 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Tests if two given dtbs are structurally equal (including order)
+ * Copyright (C) 2007 David Gibson, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+static int expect_bad; /* = 0 */
+
+int main(int argc, char *argv[])
+{
+	const char *filename;
+	char *fdt;
+	size_t len;
+	int err;
+
+	test_init(argc, argv);
+	if ((argc != 2)
+	    && ((argc != 3) || !streq(argv[1], "-n")))
+		CONFIG("Usage: %s [-n] <dtb file>", argv[0]);
+	if (argc == 3)
+		expect_bad = 1;
+
+	filename = argv[argc-1];
+	err = utilfdt_read_err(filename, &fdt, &len);
+	if (err)
+		CONFIG("Couldn't open blob from \"%s\": %s",
+		       filename, strerror(err));
+
+	vg_prepare_blob(fdt, len);
+
+	err = fdt_check_full(fdt, len);
+
+	if (expect_bad && (err == 0))
+		FAIL("fdt_check_full() succeeded unexpectedly");
+	else if (!expect_bad && (err != 0))
+		FAIL("fdt_check_full() failed: %s", fdt_strerror(err));
+
+	PASS();
+}