Merge bitcoin/bitcoin#21936: fuzz: Terminate immediately if a fuzzing harness tries to create a TCP socket (belt and suspenders)

393992b049d3bcf0b2a3439be128d13d6567f0b1 fuzz: Terminate immediately if a fuzzing harness ever tries to create a TCP socket (belt and suspenders) (practicalswift)

Pull request description:

  Terminate immediately if a fuzzing harness ever to create a TCP socket (belt and suspenders).

  Obviously this _should_ never happen, but if it _does_ happen we want immediate termination instead of a TCP socket :)

ACKs for top commit:
  MarcoFalke:
    ACK 393992b049d3bcf0b2a3439be128d13d6567f0b1

Tree-SHA512: 5bbff1f7e9a58b3eae24f742b7daf3fc870424c985f29bed5931e47a708d9c0984bfd8762f43658cffa9c69d32f86d56deb48bc7e43821e3398052174b6a160e

src/test/fuzz/fuzz.cpp

@@ -4,10 +4,15 @@
 
 #include <test/fuzz/fuzz.h>
 
+#include <netaddress.h>
+#include <netbase.h>
 #include <test/util/setup_common.h>
 #include <util/check.h>
+#include <util/sock.h>
 
 #include <cstdint>
+#include <exception>
+#include <memory>
 #include <unistd.h>
 #include <vector>
 
@@ -29,6 +34,9 @@ static TypeTestOneInput* g_test_one_input{nullptr};
 
 void initialize()
 {
+    // Terminate immediately if a fuzzing harness ever tries to create a TCP socket.
+    CreateSock = [](const CService&) -> std::unique_ptr<Sock> { std::terminate(); };
+
     bool should_abort{false};
     if (std::getenv("PRINT_ALL_FUZZ_TARGETS_AND_ABORT")) {
         for (const auto& t : FuzzTargets()) {