test/fuzz: add fuzzing tests for IPROTO decoders

Examples of IPROTO decoding issues: tarantool#3900, tarantool#1928, tarantool#6781.
Patch adds a number of fuzzing tests that covers IPROTO decoding:

- xrow_decode_auth
- xrow_decode_begin
- xrow_decode_call
- xrow_decode_dml
- xrow_decode_error
- xrow_decode_id
- xrow_decode_raft
- xrow_decode_sql
- xrow_decode_watch
- xrow_greeting_decode
- xrow_header_decode

NO_DOC=testing
NO_CHANGELOG=testing

src/box/xrow.c

@@ -1436,7 +1436,8 @@ int
 xrow_decode_raft(const struct xrow_header *row, struct raft_request *r,
 		 struct vclock *vclock)
 {
-	assert(row->type == IPROTO_RAFT);
+	if (row->type != IPROTO_RAFT)
+		goto bad_msgpack;
 	if (row->bodycnt != 1 || row->group_id != GROUP_LOCAL) {
 		diag_set(ClientError, ER_INVALID_MSGPACK,
 			 "malformed raft request");
@@ -1786,7 +1787,8 @@ xrow_decode_error(const struct xrow_header *row)
 int
 xrow_decode_begin(const struct xrow_header *row, struct begin_request *request)
 {
-	assert(row->type == IPROTO_BEGIN);
+	if (row->type != IPROTO_BEGIN)
+		goto bad_msgpack;
 	memset(request, 0, sizeof(*request));
 
 	/** Request without extra options. */

test/fuzz/CMakeLists.txt

@@ -93,6 +93,50 @@ create_fuzz_test(PREFIX mp_datetime
                  LIBRARIES core fuzzer_config
 )
 
+create_fuzz_test(PREFIX xrow_greeting_decode
+                 SOURCES xrow_greeting_decode_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_id
+                 SOURCES xrow_decode_id_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_header_decode
+                 SOURCES xrow_header_decode_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_auth
+                 SOURCES xrow_decode_auth_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_begin
+                 SOURCES xrow_decode_begin_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_call
+                 SOURCES xrow_decode_call_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_dml
+                 SOURCES xrow_decode_dml_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_error
+                 SOURCES xrow_decode_error_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_raft
+                 SOURCES xrow_decode_raft_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_sql
+                 SOURCES xrow_decode_sql_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
+create_fuzz_test(PREFIX xrow_decode_watch
+                 SOURCES xrow_decode_watch_fuzzer.c
+                 LIBRARIES xrow fuzzer_config)
+
 include(ProtobufMutator)
 
 # UndefinedBehaviorSanitizer is not supported in LuaJIT.

test/fuzz/xrow_decode_auth_fuzzer.c

@@ -0,0 +1,45 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+	struct xrow_header row = {0};
+	row.body[0] = body;
+	row.bodycnt = 1;
+	row.type = IPROTO_OK;
+
+	struct auth_request request = {0};
+	xrow_decode_auth(&row, &request);
+
+	return 0;
+}

test/fuzz/xrow_decode_begin_fuzzer.c

@@ -0,0 +1,46 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+	struct xrow_header row = {0};
+	row.body[0] = body;
+	row.bodycnt = 1;
+	row.type = IPROTO_BEGIN;
+
+	struct begin_request request = {0};
+	if (xrow_decode_begin(&row, &request) == -1)
+		return -1;
+
+	return 0;
+}

test/fuzz/xrow_decode_call_fuzzer.c

@@ -0,0 +1,46 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+
+	struct xrow_header row = {0};
+	row.type = IPROTO_CALL; /* TODO: IPROTO_CALL_16 */
+	row.body[0] = body;
+	row.bodycnt = 1;
+
+	struct call_request request = {0};
+	xrow_decode_call(&row, &request);
+
+	return 0;
+}

test/fuzz/xrow_decode_dml_fuzzer.c

@@ -0,0 +1,46 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+
+	struct xrow_header row = {0};
+	row.body[0] = body;
+	row.bodycnt = 1;
+
+	struct request request = {0};
+	if (xrow_decode_dml(&row, &request, 0) == -1)
+		return -1;
+
+	return 0;
+}

test/fuzz/xrow_decode_error_fuzzer.c

@@ -0,0 +1,44 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+
+	struct xrow_header row = {0};
+	row.body[0] = body;
+	row.bodycnt = 1;
+
+	xrow_decode_error(&row);
+
+	return 0;
+}

test/fuzz/xrow_decode_id_fuzzer.c

@@ -0,0 +1,46 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+
+	struct xrow_header row = {0};
+	row.body[0] = body;
+	row.bodycnt = 1;
+
+	struct id_request request = {0};
+	if (xrow_decode_id(&row, &request) == -1)
+		return -1;
+
+	return 0;
+}

test/fuzz/xrow_decode_raft_fuzzer.c

@@ -0,0 +1,46 @@
+#include "box/xrow.h"
+#include "box/iproto_constants.h"
+#include "fiber.h"
+#include "memory.h"
+
+void
+cord_on_yield(void) {}
+
+__attribute__((constructor))
+static void
+setup(void)
+{
+	memory_init();
+	fiber_init(fiber_c_invoke);
+}
+
+__attribute__((destructor))
+static void
+teardown(void)
+{
+	fiber_free();
+	memory_free();
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	const char *d = (const char *)data;
+	const char *end = (const char *)data + size;
+	if (mp_check(&d, end) != 0)
+		return -1;
+
+	struct iovec body = {0};
+	body.iov_base = (void *)data;
+	body.iov_len = size;
+
+	struct xrow_header row = {0};
+	row.body[0] = body;
+	row.bodycnt = 1;
+
+	struct raft_request request = {0};
+	struct vclock vclock = {0};
+	xrow_decode_raft(&row, &request, &vclock);
+
+	return 0;
+}