From: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Date: Thu, 9 Jan 2020 04:40:02 +0000 (+1300)
Subject: fuzz: add a fuzzer for parsing ldb controls
X-Git-Tag: ldb-2.1.0~51
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=beb386b584bdff25c714feb7f76d73b65ed072e7;p=thirdparty%2Fsamba.git

fuzz: add a fuzzer for parsing ldb controls

We have had issues here in the past.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Sun Jan 12 21:21:30 UTC 2020 on sn-devel-184
---

diff --git a/lib/fuzzing/fuzz_ldb_parse_control.c b/lib/fuzzing/fuzz_ldb_parse_control.c
new file mode 100644
index 00000000000..bd3fda87fdb
--- /dev/null
+++ b/lib/fuzzing/fuzz_ldb_parse_control.c
@@ -0,0 +1,46 @@
+/*
+   Fuzzing ldb_parse_control_from_string
+   Copyright (C) Catalyst IT 2020
+
+   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 "ldb_private.h"
+
+
+#define MAX_LENGTH (2 * 1024 * 1024 - 1)
+char buf[MAX_LENGTH + 1] = {0};
+
+int LLVMFuzzerTestOneInput(uint8_t *input, size_t len)
+{
+	struct ldb_control *control = NULL;
+	struct ldb_context *ldb = ldb_init(NULL, NULL);
+	/*
+	 * We copy the buffer in order to NUL-teminate, because running off
+	 *  the end of the string would be an uninteresting crash.
+	 */
+	if (len > MAX_LENGTH) {
+		len = MAX_LENGTH;
+	}
+	memcpy(buf, input, len);
+	buf[len] = 0;
+
+	control = ldb_parse_control_from_string(ldb, ldb, buf);
+	if (control != NULL) {
+		ldb_control_to_string(ldb, control);
+	}
+	TALLOC_FREE(ldb);
+	return 0;
+}
diff --git a/lib/fuzzing/wscript_build b/lib/fuzzing/wscript_build
index 75c41ac83f4..4d41a959bff 100644
--- a/lib/fuzzing/wscript_build
+++ b/lib/fuzzing/wscript_build
@@ -42,6 +42,11 @@ bld.SAMBA_BINARY('fuzz_ldap_decode',
                  deps='fuzzing cli-ldap afl-fuzz-main',
                  fuzzer=True)
 
+bld.SAMBA_BINARY('fuzz_ldb_parse_control',
+                 source='fuzz_ldb_parse_control.c',
+                 deps='fuzzing ldb afl-fuzz-main',
+                 fuzzer=True)
+
 bld.SAMBA_BINARY('fuzz_ldb_parse_tree',
                  source='fuzz_ldb_parse_tree.c',
                  deps='fuzzing ldb afl-fuzz-main',