Merge #18314: tests: Add deserialization fuzzing of SnapshotMetadata (utxo_snapshot). Increase fuzzing coverage.

08eab0f599a7be7b9b0256bfe9e3a793fe7450db tests: Add fuzzing of CSubNet, CNetAddr and CService related functions (practicalswift)
7a861a62c164ab9b07d6fca09b6a8176e688f1f6 tests: Fuzz HasAllDesirableServiceFlags(...) and MayHaveUsefulAddressDB(...) (practicalswift)
47a263108b05c7039baba5618656898312a7a5ef tests: Fuzz DecodeBase64PSBT(...) (practicalswift)
d3d4892ef45d09edbbe4672b112100743970b2a5 tests: Simplify code by removing unwarranted use of unique_ptr:s (practicalswift)
e57e67057ae76db73f52ddd5480a4ea5b4bf1636 tests: Fuzz DecodeHexBlk(...) (practicalswift)
117a706faba586f2095f97cf630b709b3e29a947 tests: Fuzz RecursiveDynamicUsage(const std::shared_ptr<X>& p) (practicalswift)
81b58a3161c5d558dadd2b7093e4fc9687844cd9 tests: Fuzz operator!= of CService (practicalswift)
c2c58f6f59d38e3d60fe0a8fa45b2a45deee84cc tests: Increase fuzzing coverage of DecompressScript(...) (practicalswift)
9f8d74a8c78457ed49c7ff81bae909c8e003670b tests: Fuzz currently uncovered code path in TxToUniv(...) (practicalswift)
46ef4cfe5f416cb34e889646df3ee241b1d5ae5a tests: Re-arrange test cases in parse_univalue to increase coverage (practicalswift)
516cc6fc7842c13a1d54c6ea2b9e3d335a872125 tests: Remove unit test from fuzzing harness (practicalswift)
7b169cae207ad1301c4edf7d623407d1f377169d tests: Add deserialization fuzzing of SnapshotMetadata (utxo_snapshot), uint160 and uint256 (practicalswift)

Pull request description:

  Add deserialization fuzzing of `SnapshotMetadata` (`utxo_snapshot`).

  Increase fuzzing coverage.

ACKs for top commit:
  MarcoFalke:
    ACK 08eab0f599 🗾

Tree-SHA512: 5dca2316d64b9eb1da9bbbb3831de285b1524cbe815e3dba0f9c4eac7f39b403eb26ee0bdd3d9409a1838e7226d783946ec0d251e514a99f68267a95ac56d416

13 files changed, 86 insertions, 17 deletions

diff --git a/src/test/fuzz/base_encode_decode.cpp b/src/test/fuzz/base_encode_decode.cpp
index cb0fbdf76f..adad6b3f96 100644
--- a/src/test/fuzz/base_encode_decode.cpp
+++ b/src/test/fuzz/base_encode_decode.cpp
@@ -5,6 +5,7 @@
 #include <test/fuzz/fuzz.h>
 
 #include <base58.h>
+#include <psbt.h>
 #include <util/string.h>
 #include <util/strencodings.h>
 
@@ -44,4 +45,8 @@ void test_one_input(const std::vector<uint8_t>& buffer)
         assert(encoded_string == TrimString(encoded_string));
         assert(ToLower(encoded_string) == ToLower(TrimString(random_encoded_string)));
     }
+
+    PartiallySignedTransaction psbt;
+    std::string error;
+    (void)DecodeBase64PSBT(psbt, random_encoded_string, error);
 }
diff --git a/src/test/fuzz/block.cpp b/src/test/fuzz/block.cpp
index 431248de4a..9d0ad369a2 100644
--- a/src/test/fuzz/block.cpp
+++ b/src/test/fuzz/block.cpp
@@ -19,7 +19,7 @@
 
 void initialize()
 {
-    const static auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
     SelectParams(CBaseChainParams::REGTEST);
 }
 
@@ -59,5 +59,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
     (void)GetBlockWeight(block);
     (void)GetWitnessCommitmentIndex(block);
-    (void)RecursiveDynamicUsage(block);
+    const size_t raw_memory_size = RecursiveDynamicUsage(block);
+    const size_t raw_memory_size_as_shared_ptr = RecursiveDynamicUsage(std::make_shared<CBlock>(block));
+    assert(raw_memory_size_as_shared_ptr > raw_memory_size);
 }
diff --git a/src/test/fuzz/descriptor_parse.cpp b/src/test/fuzz/descriptor_parse.cpp
index 47d5038c26..a0ef08cca6 100644
--- a/src/test/fuzz/descriptor_parse.cpp
+++ b/src/test/fuzz/descriptor_parse.cpp
@@ -10,7 +10,7 @@
 
 void initialize()
 {
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
     SelectParams(CBaseChainParams::REGTEST);
 }
 
diff --git a/src/test/fuzz/deserialize.cpp b/src/test/fuzz/deserialize.cpp
index f06f339b9d..964fc85302 100644
--- a/src/test/fuzz/deserialize.cpp
+++ b/src/test/fuzz/deserialize.cpp
@@ -13,6 +13,7 @@
 #include <key.h>
 #include <merkleblock.h>
 #include <net.h>
+#include <node/utxo_snapshot.h>
 #include <primitives/block.h>
 #include <protocol.h>
 #include <psbt.h>
@@ -34,7 +35,7 @@
 void initialize()
 {
     // Fuzzers using pubkey must hold an ECCVerifyHandle.
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
 }
 
 namespace {
@@ -214,9 +215,24 @@ void test_one_input(const std::vector<uint8_t>& buffer)
 #elif BLOCKTRANSACTIONSREQUEST_DESERIALIZE
         BlockTransactionsRequest btr;
         DeserializeFromFuzzingInput(buffer, btr);
+#elif SNAPSHOTMETADATA_DESERIALIZE
+        SnapshotMetadata snapshot_metadata;
+        DeserializeFromFuzzingInput(buffer, snapshot_metadata);
+#elif UINT160_DESERIALIZE
+        uint160 u160;
+        DeserializeFromFuzzingInput(buffer, u160);
+        AssertEqualAfterSerializeDeserialize(u160);
+#elif UINT256_DESERIALIZE
+        uint256 u256;
+        DeserializeFromFuzzingInput(buffer, u256);
+        AssertEqualAfterSerializeDeserialize(u256);
 #else
 #error Need at least one fuzz target to compile
 #endif
+        // Classes intentionally not covered in this file since their deserialization code is
+        // fuzzed elsewhere:
+        // * Deserialization of CTxOut is fuzzed in test/fuzz/tx_out.cpp
+        // * Deserialization of CMutableTransaction is fuzzed in src/test/fuzz/transaction.cpp
     } catch (const invalid_fuzzing_input_exception&) {
     }
 }
diff --git a/src/test/fuzz/eval_script.cpp b/src/test/fuzz/eval_script.cpp
index 7acdd76857..6a1b037630 100644
--- a/src/test/fuzz/eval_script.cpp
+++ b/src/test/fuzz/eval_script.cpp
@@ -12,7 +12,7 @@
 
 void initialize()
 {
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
 }
 
 void test_one_input(const std::vector<uint8_t>& buffer)
diff --git a/src/test/fuzz/hex.cpp b/src/test/fuzz/hex.cpp
index 2de6100d7b..3bbf0084c2 100644
--- a/src/test/fuzz/hex.cpp
+++ b/src/test/fuzz/hex.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <core_io.h>
+#include <pubkey.h>
 #include <primitives/block.h>
 #include <rpc/util.h>
 #include <test/fuzz/fuzz.h>
@@ -15,6 +16,10 @@
 #include <string>
 #include <vector>
 
+void initialize() {
+    static const ECCVerifyHandle verify_handle;
+}
+
 void test_one_input(const std::vector<uint8_t>& buffer)
 {
     const std::string random_hex_string(buffer.begin(), buffer.end());
@@ -33,4 +38,6 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
     CBlockHeader block_header;
     (void)DecodeHexBlockHeader(block_header, random_hex_string);
+    CBlock block;
+    (void)DecodeHexBlk(block, random_hex_string);
 }
diff --git a/src/test/fuzz/integer.cpp b/src/test/fuzz/integer.cpp
index 350d3d3331..980042e811 100644
--- a/src/test/fuzz/integer.cpp
+++ b/src/test/fuzz/integer.cpp
@@ -14,6 +14,7 @@
 #include <netbase.h>
 #include <policy/settings.h>
 #include <pow.h>
+#include <protocol.h>
 #include <pubkey.h>
 #include <rpc/util.h>
 #include <script/signingprovider.h>
@@ -216,4 +217,10 @@ void test_one_input(const std::vector<uint8_t>& buffer)
         stream >> deserialized_b;
         assert(b == deserialized_b && stream.empty());
     }
+
+    {
+        const ServiceFlags service_flags = (ServiceFlags)u64;
+        (void)HasAllDesirableServiceFlags(service_flags);
+        (void)MayHaveUsefulAddressDB(service_flags);
+    }
 }
diff --git a/src/test/fuzz/netaddress.cpp b/src/test/fuzz/netaddress.cpp
index 7d87ebc214..d8d53566c7 100644
--- a/src/test/fuzz/netaddress.cpp
+++ b/src/test/fuzz/netaddress.cpp
@@ -120,4 +120,15 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     const CNetAddr other_net_addr = ConsumeNetAddr(fuzzed_data_provider);
     (void)net_addr.GetReachabilityFrom(&other_net_addr);
     (void)sub_net.Match(other_net_addr);
+
+    const CService other_service{net_addr, fuzzed_data_provider.ConsumeIntegral<uint16_t>()};
+    assert((service == other_service) != (service != other_service));
+    (void)(service < other_service);
+
+    const CSubNet sub_net_copy_1{net_addr, other_net_addr};
+    const CSubNet sub_net_copy_2{net_addr};
+
+    CNetAddr mutable_net_addr;
+    mutable_net_addr.SetIP(net_addr);
+    assert(net_addr == mutable_net_addr);
 }
diff --git a/src/test/fuzz/parse_univalue.cpp b/src/test/fuzz/parse_univalue.cpp
index 3ad112dbad..571364aaa6 100644
--- a/src/test/fuzz/parse_univalue.cpp
+++ b/src/test/fuzz/parse_univalue.cpp
@@ -14,7 +14,7 @@
 
 void initialize()
 {
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
     SelectParams(CBaseChainParams::REGTEST);
 }
 
@@ -35,21 +35,31 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
     try {
         (void)ParseHashO(univalue, "A");
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
         (void)ParseHashO(univalue, random_string);
     } catch (const UniValue&) {
     } catch (const std::runtime_error&) {
     }
     try {
         (void)ParseHashV(univalue, "A");
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
         (void)ParseHashV(univalue, random_string);
     } catch (const UniValue&) {
     } catch (const std::runtime_error&) {
     }
     try {
         (void)ParseHexO(univalue, "A");
+    } catch (const UniValue&) {
+    }
+    try {
         (void)ParseHexO(univalue, random_string);
     } catch (const UniValue&) {
-    } catch (const std::runtime_error&) {
     }
     try {
         (void)ParseHexUV(univalue, "A");
@@ -59,6 +69,10 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
     try {
         (void)ParseHexV(univalue, "A");
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
         (void)ParseHexV(univalue, random_string);
     } catch (const UniValue&) {
     } catch (const std::runtime_error&) {
diff --git a/src/test/fuzz/psbt.cpp b/src/test/fuzz/psbt.cpp
index 1ce28f9a6d..ca3e0b8586 100644
--- a/src/test/fuzz/psbt.cpp
+++ b/src/test/fuzz/psbt.cpp
@@ -19,7 +19,7 @@
 
 void initialize()
 {
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
 }
 
 void test_one_input(const std::vector<uint8_t>& buffer)
diff --git a/src/test/fuzz/script.cpp b/src/test/fuzz/script.cpp
index 0d18784302..2f50f1b838 100644
--- a/src/test/fuzz/script.cpp
+++ b/src/test/fuzz/script.cpp
@@ -14,14 +14,16 @@
 #include <script/signingprovider.h>
 #include <script/standard.h>
 #include <streams.h>
+#include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
 #include <univalue.h>
 #include <util/memory.h>
 
 void initialize()
 {
     // Fuzzers using pubkey must hold an ECCVerifyHandle.
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
 
     SelectParams(CBaseChainParams::REGTEST);
 }
@@ -41,13 +43,6 @@ void test_one_input(const std::vector<uint8_t>& buffer)
         assert(script == decompressed_script);
     }
 
-    for (unsigned int size = 0; size < 6; ++size) {
-        std::vector<unsigned char> vch(GetSpecialScriptSize(size), 0x00);
-        vch.insert(vch.end(), buffer.begin(), buffer.end());
-        CScript decompressed_script;
-        (void)DecompressScript(decompressed_script, size, vch);
-    }
-
     CTxDestination address;
     (void)ExtractDestination(script, address);
 
@@ -92,4 +87,14 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     ScriptToUniv(script, o3, true);
     UniValue o4(UniValue::VOBJ);
     ScriptToUniv(script, o4, false);
+
+    {
+        FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+        const std::vector<uint8_t> bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider);
+        // DecompressScript(..., ..., bytes) is not guaranteed to be defined if bytes.size() <= 23.
+        if (bytes.size() >= 24) {
+            CScript decompressed_script;
+            DecompressScript(decompressed_script, fuzzed_data_provider.ConsumeIntegral<unsigned int>(), bytes);
+        }
+    }
 }
diff --git a/src/test/fuzz/script_flags.cpp b/src/test/fuzz/script_flags.cpp
index 08622d0979..3d8ece7c61 100644
--- a/src/test/fuzz/script_flags.cpp
+++ b/src/test/fuzz/script_flags.cpp
@@ -15,7 +15,7 @@ static bool IsValidFlagCombination(unsigned flags);
 
 void initialize()
 {
-    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    static const ECCVerifyHandle verify_handle;
 }
 
 void test_one_input(const std::vector<uint8_t>& buffer)
diff --git a/src/test/fuzz/transaction.cpp b/src/test/fuzz/transaction.cpp
index 1ec69cc23d..d8e84f1a0f 100644
--- a/src/test/fuzz/transaction.cpp
+++ b/src/test/fuzz/transaction.cpp
@@ -108,5 +108,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
     if (!skip_tx_to_univ) {
         TxToUniv(tx, /* hashBlock */ {}, u);
+        static const uint256 u256_max(uint256S("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"));
+        TxToUniv(tx, u256_max, u);
     }
 }