1 files changed, 96 insertions, 0 deletions
diff --git a/fuzz/mutator_aux.h b/fuzz/mutator_aux.h
new file mode 100644
index 000000000000..6b1a98215b07
--- /dev/null
+++ b/fuzz/mutator_aux.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2019 Yubico AB. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+#ifndef _MUTATOR_AUX_H
+#define _MUTATOR_AUX_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <cbor.h>
+
+#include "../src/fido.h"
+#include "../src/fido/bio.h"
+#include "../src/fido/config.h"
+#include "../src/fido/credman.h"
+#include "../src/fido/eddsa.h"
+#include "../src/fido/es256.h"
+#include "../src/fido/es256.h"
+#include "../src/fido/rs256.h"
+#include "../src/netlink.h"
+
+/*
+ * As of LLVM 10.0.0, MSAN support in libFuzzer was still experimental.
+ * We therefore have to be careful when using our custom mutator, or
+ * MSAN will flag uninitialised reads on memory populated by libFuzzer.
+ * Since there is no way to suppress MSAN without regenerating object
+ * code (in which case you might as well rebuild libFuzzer with MSAN),
+ * we adjust our mutator to make it less accurate while allowing
+ * fuzzing to proceed.
+ */
+
+#if defined(__has_feature)
+# if  __has_feature(memory_sanitizer)
+#  include <sanitizer/msan_interface.h>
+#  define NO_MSAN	__attribute__((no_sanitize("memory")))
+#  define WITH_MSAN	1
+# endif
+#endif
+
+#if !defined(WITH_MSAN)
+# define NO_MSAN
+#endif
+
+#define MUTATE_SEED	0x01
+#define MUTATE_PARAM	0x02
+#define MUTATE_WIREDATA	0x04
+#define MUTATE_ALL	(MUTATE_SEED | MUTATE_PARAM | MUTATE_WIREDATA)
+
+#define MAXSTR	1024
+#define MAXBLOB	3072
+
+struct blob {
+	uint8_t body[MAXBLOB];
+	size_t len;
+};
+
+struct param;
+
+struct param *unpack(const uint8_t *, size_t);
+size_t pack(uint8_t *, size_t, const struct param *);
+size_t pack_dummy(uint8_t *, size_t);
+void mutate(struct param *, unsigned int, unsigned int);
+void test(const struct param *);
+
+void consume(const void *, size_t);
+void consume_str(const char *);
+
+int unpack_blob(cbor_item_t *, struct blob *);
+int unpack_byte(cbor_item_t *, uint8_t *);
+int unpack_int(cbor_item_t *, int *);
+int unpack_string(cbor_item_t *, char *);
+
+cbor_item_t *pack_blob(const struct blob *);
+cbor_item_t *pack_byte(uint8_t);
+cbor_item_t *pack_int(int);
+cbor_item_t *pack_string(const char *);
+
+void mutate_byte(uint8_t *);
+void mutate_int(int *);
+void mutate_blob(struct blob *);
+void mutate_string(char *);
+
+ssize_t fd_read(int, void *, size_t);
+ssize_t fd_write(int, const void *, size_t);
+
+fido_dev_t *open_dev(int);
+void set_wire_data(const uint8_t *, size_t);
+
+void prng_init(unsigned long);
+unsigned long prng_uint32(void);
+
+uint32_t uniform_random(uint32_t);
+
+#endif /* !_MUTATOR_AUX_H */