trusty: Fuzzer for Gatekeeper TA

// Copyright (C) 2020 The Android Open Source Project

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//       http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

cc_fuzz {

    name: "trusty_gatekeeper_fuzzer",

    defaults: ["trusty_fuzzer_defaults"],

    srcs: ["fuzz.cpp"],

}

/*

 * Copyright (C) 2020 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#undef NDEBUG

#include <assert.h>

#include <log/log.h>

#include <stdlib.h>

#include <trusty/fuzz/utils.h>

#include <unistd.h>

#define TIPC_DEV "/dev/trusty-ipc-dev0"

#define GATEKEEPER_PORT "com.android.trusty.gatekeeper"

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {

    static uint8_t buf[TIPC_MAX_MSG_SIZE];

    android::trusty::fuzz::TrustyApp ta(TIPC_DEV, GATEKEEPER_PORT);

    auto ret = ta.Connect();

    /*

     * If we can't connect, then assume TA crashed.

     * TODO: Get some more info, e.g. stacks, to help Haiku dedup crashes.

     */

    assert(ret.ok());

    /* Send message to test server */

    ret = ta.Write(data, size);

    if (!ret.ok()) {

        return -1;

    }

    /* Read message from test server */

    ret = ta.Read(&buf, sizeof(buf));

    if (!ret.ok()) {

        return -1;

    }

    return 0;

}