Merge #17093: tests: Add fuzzing harness for various CTx{In,Out} related functions

d5766f223f627bf2eb731ce8552dfafa2b824378 tests: Add corpora suppression (FUZZERS_MISSING_CORPORA) for fuzzers missing in https://github.com/bitcoin-core/qa-assets/tree/master/fuzz_seed_corpus (practicalswift)
e75ecb91c730115290e1201371492c2cd334e9b4 tests: Add fuzzing harness for various CTxOut related functions (practicalswift)
ce935292c041162e160d95fc6afeda3dceded2cf tests: Add fuzzing harness for various CTxIn related functions (practicalswift)

Pull request description:

  Add fuzzing harness for various `CTx{In,Out}` related functions.

  **Testing this PR**

  Run:

  ```
  $ CC=clang CXX=clang++ ./configure --enable-fuzz --with-sanitizers=address,fuzzer,undefined
  $ make
  $ src/test/fuzz/tx_in
  …
  $ src/test/fuzz/tx_out
  …
  # And to to quickly verify that the relevant code regions are triggered, that the
  # fuzzing throughput seems reasonable, etc.
  $ contrib/devtools/test_fuzzing_harnesses.sh '^tx_'
  ```

  `test_fuzzing_harnesses.sh` can be found in PR #17000.

Top commit has no ACKs.

Tree-SHA512: f1374307a2581ebc3968d012ea2438061bbb84ece068e584fae9750669a6cd003723dde14db88e77c9579281ecd4eaa2a7ff0614f253d8c075e6dd16dd2e68d5

2 files changed, 68 insertions, 0 deletions

diff --git a/src/test/fuzz/tx_in.cpp b/src/test/fuzz/tx_in.cpp
new file mode 100644
index 0000000000..8e116537d1
--- /dev/null
+++ b/src/test/fuzz/tx_in.cpp
@@ -0,0 +1,33 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <consensus/validation.h>
+#include <core_memusage.h>
+#include <policy/policy.h>
+#include <primitives/transaction.h>
+#include <streams.h>
+#include <test/fuzz/fuzz.h>
+#include <version.h>
+
+#include <cassert>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
+    CTxIn tx_in;
+    try {
+        int version;
+        ds >> version;
+        ds.SetVersion(version);
+        ds >> tx_in;
+    } catch (const std::ios_base::failure&) {
+        return;
+    }
+
+    (void)GetTransactionInputWeight(tx_in);
+    (void)GetVirtualTransactionInputSize(tx_in);
+    (void)RecursiveDynamicUsage(tx_in);
+
+    (void)tx_in.ToString();
+}
diff --git a/src/test/fuzz/tx_out.cpp b/src/test/fuzz/tx_out.cpp
new file mode 100644
index 0000000000..aa1338d5ba
--- /dev/null
+++ b/src/test/fuzz/tx_out.cpp
@@ -0,0 +1,35 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <consensus/validation.h>
+#include <core_memusage.h>
+#include <policy/policy.h>
+#include <primitives/transaction.h>
+#include <streams.h>
+#include <test/fuzz/fuzz.h>
+#include <version.h>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    CDataStream ds(buffer, SER_NETWORK, INIT_PROTO_VERSION);
+    CTxOut tx_out;
+    try {
+        int version;
+        ds >> version;
+        ds.SetVersion(version);
+        ds >> tx_out;
+    } catch (const std::ios_base::failure&) {
+        return;
+    }
+
+    const CFeeRate dust_relay_fee{DUST_RELAY_TX_FEE};
+    (void)GetDustThreshold(tx_out, dust_relay_fee);
+    (void)IsDust(tx_out, dust_relay_fee);
+    (void)RecursiveDynamicUsage(tx_out);
+
+    (void)tx_out.ToString();
+    (void)tx_out.IsNull();
+    tx_out.SetNull();
+    assert(tx_out.IsNull());
+}