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/*
* The MIT License (MIT)
*
* Copyright (c) 2022 Nathaniel Brough
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include <cassert>
#include <fuzzer/FuzzedDataProvider.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "class/cdc/cdc_device.h"
#include "fuzz/fuzz.h"
#include "tusb.h"
#include <cstdint>
#include <string>
#include <vector>
extern "C" {
#define FUZZ_ITERATIONS 500
//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
void cdc_task(FuzzedDataProvider *provider);
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
FuzzedDataProvider provider(Data, Size);
std::vector<uint8_t> callback_data = provider.ConsumeBytes<uint8_t>(
provider.ConsumeIntegralInRange<size_t>(0, Size));
fuzz_init(callback_data.data(), callback_data.size());
// init device stack on configured roothub port
tud_init(BOARD_TUD_RHPORT);
for (int i = 0; i < FUZZ_ITERATIONS; i++) {
if (provider.remaining_bytes() == 0) {
return 0;
}
tud_int_handler(provider.ConsumeIntegral<uint8_t>());
tud_task(); // tinyusb device task
cdc_task(&provider);
}
return 0;
}
//--------------------------------------------------------------------+
// USB CDC
//--------------------------------------------------------------------+
enum CdcApiFuncs {
kCdcNConnected,
kCdcNGetLineState,
kCdcNGetLineCoding,
kCdcNSetWantedChar,
kCdcNAvailable,
kCdcNRead,
kCdcNReadChar,
kCdcNReadFlush,
kCdcNPeek,
kCdcNWrite,
kCdcNWriteChar,
kCdcNWriteStr,
kCdcNWriteFlush,
kCdcNWriteAvailable,
kCdcNWriteClear,
// We don't need to fuzz tud_cdc_<not n>* as they are just wrappers
// calling with n==0.
kMaxValue,
};
void cdc_task(FuzzedDataProvider *provider) {
assert(provider != NULL);
const int kMaxBufferSize = 4096;
switch (provider->ConsumeEnum<CdcApiFuncs>()) {
case kCdcNConnected:
// TODO: Fuzz interface number
(void)tud_cdc_n_connected(0);
break;
case kCdcNGetLineState:
// TODO: Fuzz interface number
(void)tud_cdc_n_get_line_state(0);
break;
case kCdcNGetLineCoding: {
cdc_line_coding_t coding;
// TODO: Fuzz interface number
(void)tud_cdc_n_get_line_coding(0, &coding);
} break;
case kCdcNSetWantedChar:
// TODO: Fuzz interface number
(void)tud_cdc_n_set_wanted_char(0, provider->ConsumeIntegral<char>());
break;
case kCdcNAvailable:
// TODO: Fuzz interface number
(void)tud_cdc_n_available(0);
break;
case kCdcNRead: {
std::vector<uint8_t> buffer;
buffer.resize(provider->ConsumeIntegralInRange<size_t>(0, kMaxBufferSize));
// TODO: Fuzz interface number
(void)tud_cdc_n_read(0, buffer.data(), buffer.size());
break;
}
case kCdcNReadChar:
// TODO: Fuzz interface number
tud_cdc_n_read_char(0);
break;
case kCdcNReadFlush:
// TODO: Fuzz interface number
tud_cdc_n_read_flush(0);
break;
case kCdcNPeek: {
uint8_t peak = 0;
tud_cdc_n_peek(0, &peak);
break;
}
case kCdcNWrite: {
std::vector<uint8_t> buffer = provider->ConsumeBytes<uint8_t>(
provider->ConsumeIntegralInRange<size_t>(0, kMaxBufferSize));
// TODO: Fuzz interface number
(void)tud_cdc_n_write(0, buffer.data(), buffer.size());
} break;
case kCdcNWriteChar:
// TODO: Fuzz interface number
(void)tud_cdc_n_write_char(0, provider->ConsumeIntegral<char>());
break;
case kCdcNWriteStr: {
std::string str = provider->ConsumeRandomLengthString(kMaxBufferSize);
// TODO: Fuzz interface number
(void)tud_cdc_n_write_str(0, str.c_str());
break;
}
case kCdcNWriteFlush:
// TODO: Fuzz interface number
(void)tud_cdc_n_write_flush(0);
break;
case kCdcNWriteAvailable:
// TODO: Fuzz interface number
(void)tud_cdc_n_write_available(0);
break;
case kCdcNWriteClear:
// TODO: Fuzz interface number
(void)tud_cdc_n_write_clear(0);
break;
case kMaxValue:
// Noop.
break;
}
}
}
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