1 files changed, 174 insertions, 0 deletions
diff --git a/test/fuzz/device/cdc/src/fuzz.cc b/test/fuzz/device/cdc/src/fuzz.cc
new file mode 100644
index 000000000..0560e8621
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+++ b/test/fuzz/device/cdc/src/fuzz.cc
@@ -0,0 +1,174 @@
+/*
+ * 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;
+}
+}
+}