mirror of
https://github.com/bytecodealliance/wasm-micro-runtime.git
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288 lines
8.9 KiB
C++
288 lines
8.9 KiB
C++
// Copyright (C) 2019 Intel Corporation. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "wasm_runtime_common.h"
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#include "wasm_export.h"
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#include "bh_read_file.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <iostream>
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#include <vector>
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using namespace std;
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static bool
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is_supported_val_kind(wasm_valkind_t kind)
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{
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return kind == WASM_I32 || kind == WASM_I64 || kind == WASM_F32
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|| kind == WASM_F64 || kind == WASM_EXTERNREF
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|| kind == WASM_FUNCREF;
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}
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static wasm_val_t
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pre_defined_val(wasm_valkind_t kind)
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{
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if (kind == WASM_I32) {
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return wasm_val_t{ .kind = WASM_I32, .of = { .i32 = 2025 } };
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}
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else if (kind == WASM_I64) {
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return wasm_val_t{ .kind = WASM_I64, .of = { .i64 = 168 } };
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}
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else if (kind == WASM_F32) {
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return wasm_val_t{ .kind = WASM_F32, .of = { .f32 = 3.14159f } };
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}
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else if (kind == WASM_F64) {
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return wasm_val_t{ .kind = WASM_F64, .of = { .f64 = 2.71828 } };
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}
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else if (kind == WASM_EXTERNREF) {
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return wasm_val_t{ .kind = WASM_EXTERNREF,
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.of = { .foreign = 0xabcddead } };
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}
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// because aft is_supported_val_kind() check, so we can safely return as
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// WASM_FUNCREF
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else {
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return wasm_val_t{ .kind = WASM_FUNCREF, .of = { .ref = nullptr } };
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}
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}
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void
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print_execution_args(const wasm_export_t &export_type,
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const std::vector<wasm_val_t> &args, unsigned param_count)
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{
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std::cout << "[EXECUTION] " << export_type.name << "(";
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for (unsigned p_i = 0; p_i < param_count; p_i++) {
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if (p_i != 0) {
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std::cout << ", ";
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}
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switch (args[p_i].kind) {
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case WASM_I32:
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std::cout << "i32:" << args[p_i].of.i32;
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break;
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case WASM_I64:
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std::cout << "i64:" << args[p_i].of.i64;
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break;
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case WASM_F32:
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std::cout << "f32:" << args[p_i].of.f32;
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break;
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case WASM_F64:
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std::cout << "f64:" << args[p_i].of.f64;
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break;
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case WASM_EXTERNREF:
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std::cout << "externref:" << args[p_i].of.foreign;
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break;
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default:
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// because aft is_supported_val_kind() check, so we can safely
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// return as WASM_FUNCREF
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std::cout << "funcref:" << args[p_i].of.ref;
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break;
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}
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}
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std::cout << ")" << std::endl;
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}
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static bool
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execute_export_functions(wasm_module_t module, wasm_module_inst_t inst)
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{
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int32_t export_count = wasm_runtime_get_export_count(module);
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for (int e_i = 0; e_i < export_count; e_i++) {
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wasm_export_t export_type = { 0 };
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wasm_runtime_get_export_type(module, e_i, &export_type);
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if (export_type.kind != WASM_IMPORT_EXPORT_KIND_FUNC) {
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continue;
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}
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wasm_function_inst_t func =
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wasm_runtime_lookup_function(inst, export_type.name);
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if (!func) {
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std::cout << "Failed to lookup function: " << export_type.name
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<< std::endl;
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continue;
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}
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wasm_func_type_t func_type = export_type.u.func_type;
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uint32_t param_count = wasm_func_type_get_param_count(func_type);
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/* build arguments */
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std::vector<wasm_val_t> args;
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for (unsigned p_i = 0; p_i < param_count; p_i++) {
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wasm_valkind_t param_type =
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wasm_func_type_get_param_valkind(func_type, p_i);
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if (!is_supported_val_kind(param_type)) {
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std::cout
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<< "Bypass execution because of unsupported value kind: "
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<< param_type << std::endl;
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return true;
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}
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wasm_val_t arg = pre_defined_val(param_type);
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args.push_back(arg);
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}
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/* build results storage */
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uint32_t result_count = wasm_func_type_get_result_count(func_type);
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std::vector<wasm_val_t> results = std::vector<wasm_val_t>(result_count);
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print_execution_args(export_type, args, param_count);
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/* execute the function */
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wasm_exec_env_t exec_env = wasm_runtime_get_exec_env_singleton(inst);
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if (!exec_env) {
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std::cout << "Failed to get exec env" << std::endl;
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return false;
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}
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bool ret =
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wasm_runtime_call_wasm_a(exec_env, func, result_count,
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results.data(), param_count, args.data());
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if (!ret) {
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const char *exception = wasm_runtime_get_exception(inst);
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if (!exception) {
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std::cout << "[EXECUTION] " << export_type.name
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<< "() failed. No exception info." << std::endl;
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}
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else {
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std::cout << "[EXECUTION] " << export_type.name << "() failed. "
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<< exception << std::endl;
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}
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}
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wasm_runtime_clear_exception(inst);
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}
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return true;
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}
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extern "C" int
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LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
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{
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/* libfuzzer don't allow us to modify the given Data, so we copy the data
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* here */
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std::vector<uint8_t> myData(Data, Data + Size);
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/* init runtime environment */
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wasm_runtime_init();
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char error_buf[128] = { 0 };
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wasm_module_t module =
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wasm_runtime_load((uint8_t *)myData.data(), Size, error_buf, 120);
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if (!module) {
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std::cout << "[LOADING] " << error_buf << std::endl;
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wasm_runtime_destroy();
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/* return SUCCESS because the failure has been handled */
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return 0;
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}
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wasm_module_inst_t inst = wasm_runtime_instantiate(
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module, 8 * 1024 * 1024, 16 * 1024 * 1024, error_buf, 120);
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if (!inst) {
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std::cout << "[INSTANTIATE] " << error_buf << std::endl;
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wasm_runtime_unload(module);
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wasm_runtime_destroy();
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/* return SUCCESS because the failure has been handled */
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return 0;
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}
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execute_export_functions(module, inst);
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wasm_runtime_deinstantiate(inst);
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wasm_runtime_unload(module);
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wasm_runtime_destroy();
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return 0; /* Values other than 0 and -1 are reserved for future use. */
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}
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/* Forward-declare the libFuzzer's mutator callback. */
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extern "C" size_t
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LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
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/* The custom mutator: */
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#ifdef CUSTOM_MUTATOR
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extern "C" size_t
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LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, size_t MaxSize,
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unsigned int Seed)
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{
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if ((NULL != Data) && (Size > 10)) {
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int mutate_ret = -1;
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/* delete */
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if (access("./cur.wasm", 0) == 0) {
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remove("./cur.wasm");
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}
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/* 1.write data to cur.wasm */
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FILE *fwrite_fp = fopen("./cur.wasm", "wb");
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if (NULL == fwrite_fp) {
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printf("Faild to open cur.wasm file!\n");
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return 0;
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}
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fwrite(Data, sizeof(uint8_t), Size, fwrite_fp);
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fclose(fwrite_fp);
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fwrite_fp = NULL;
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/* 2.wasm-tools mutate modify cur.wasm */
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char cmd_tmp[150] = { 0 };
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/* clang-format off */
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const char *preserve_semantic = (Seed % 2) ? "--preserve-semantics" : "";
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sprintf(cmd_tmp, "wasm-tools mutate cur.wasm --seed %d -o modified.wasm %s > /dev/null 2>&1", Seed, preserve_semantic);
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/* clang-format on */
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mutate_ret = system(cmd_tmp);
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memset(cmd_tmp, 0, sizeof(cmd_tmp));
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if (mutate_ret != 0) {
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/* If source file not valid, use libfuzzer's own modifier */
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return LLVMFuzzerMutate(Data, Size, MaxSize);
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}
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/* 3.read modified file */
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int read_len = 0;
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int file_len = 0;
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int res = 0;
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uint8_t *buf = NULL;
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FILE *fread_fp = fopen("./modified.wasm", "rb");
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if (NULL == fread_fp) {
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printf("Faild to open modified.wasm file!\n");
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exit(0);
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}
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fseek(fread_fp, 0, SEEK_END); /* location to file end */
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file_len = ftell(fread_fp); /* get file size */
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buf = (uint8_t *)malloc(file_len);
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if (NULL != buf) {
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fseek(fread_fp, 0, SEEK_SET); /* location to file start */
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read_len = fread(buf, 1, file_len, fread_fp);
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if ((read_len == file_len) && (read_len < MaxSize)) {
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/* 4.fill Data buffer */
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memcpy(Data, buf, read_len);
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res = read_len;
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}
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else {
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res = 0;
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}
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}
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else {
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res = 0;
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}
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memset(buf, 0, file_len);
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free(buf);
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fclose(fread_fp);
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fread_fp = NULL;
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return res;
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}
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else {
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if (access("./modified.wasm", 0) == 0) {
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remove("./modified.wasm");
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}
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memset(Data, 0, Size);
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Size = 0;
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return 0;
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}
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}
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#endif // CUSTOM_MUTATOR
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