Add fuzzing binary for reg_parse

A temporary file is used to store the fuzzing input.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Uri Simchoni <uri@samba.org>

lib/fuzzing/fuzz_reg_parse.c

@@ -0,0 +1,47 @@
+/*
+ * Fuzzing for reg_parse
+ * Copyright (C) Michael Hanselmann 2019
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "fuzzing/fuzzing.h"
+#include "lib/util/fault.h"
+#include "registry.h"
+#include "registry/reg_parse.h"
+
+static FILE *fp;
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+	fp = tmpfile();
+
+	return 0;
+}
+
+int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len)
+{
+	const reg_parse_callback cb = {0};
+	int ret;
+
+	rewind(fp);
+	(void)fwrite(buf, len, 1, fp);
+	(void)fflush(fp);
+	rewind(fp);
+
+	ret = reg_parse_fd(fileno(fp), &cb, "");
+
+	return 0;
+}

lib/fuzzing/wscript_build

@@ -18,3 +18,10 @@ bld.SAMBA_BINARY('fuzz_oLschema2ldif',
                  install=False,
                  enabled=bld.env.enable_libfuzzer,
                  )
+
+bld.SAMBA_BINARY('fuzz_reg_parse',
+                 source='fuzz_reg_parse.c',
+                 deps='fuzzing samba3-util smbconf REGFIO',
+                 install=False,
+                 enabled=bld.env.enable_libfuzzer,
+                 )