1 files changed, 69 insertions, 0 deletions
diff --git a/lib/fuzzing/fuzz_stable_sort_r.c b/lib/fuzzing/fuzz_stable_sort_r.c
new file mode 100644
index 0000000..68be73b
--- /dev/null
+++ b/lib/fuzzing/fuzz_stable_sort_r.c
@@ -0,0 +1,69 @@
+/*
+   Fuzzing for stable_sort
+   Copyright © Catalyst IT
+
+   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 "util/stable_sort.h"
+
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+	return 0;
+}
+
+/*
+ * For a "context" we use a byte that the values are XORed with before
+ * comparison, for a non-obvious but stable sort order.
+ */
+static int cmp_int8(int8_t *a, int8_t *b, int8_t *c)
+{
+	return (*a ^ *c) - (*b ^ *c);
+}
+
+
+#define MAX_SIZE (1024 * 1024)
+
+int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len)
+{
+	size_t i;
+	int8_t buf2[MAX_SIZE];
+	int8_t aux[MAX_SIZE];
+	int8_t context;
+
+	if (len < 1 || len > MAX_SIZE) {
+		return 0;
+	}
+	context = (int8_t)buf[0];
+	buf++;
+	len--;
+
+	memcpy(buf2, buf, len);
+
+	stable_sort_r(buf2, aux, len, 1,
+		      (samba_compare_with_context_fn_t)cmp_int8,
+		      &context);
+
+	for (i = 1; i < len; i++) {
+		int c = cmp_int8(&buf2[i - 1], &buf2[i], &context);
+		if (c > 0) {
+			abort();
+		}
+	}
+
+	return 0;
+}