Merge #20332: test: Mock IBD in net_processing fuzzers

fa4234d877ea3193bfd0e18ff68dcb8fb84b47b5 test: Mock IBD in net_processing fuzzers (MarcoFalke)

Pull request description:

  Without this the fuzzers fail to detect trivial crasher bugs, such as https://github.com/bitcoin/bitcoin/pull/20317#issuecomment-723047111

ACKs for top commit:
  practicalswift:
    Tested ACK fa4234d877ea3193bfd0e18ff68dcb8fb84b47b5

Tree-SHA512: ce5da5c0a604b7559805a98ffdde882b44ca4f91b003b493d6e1be230714ce4cccb11dbfc1fc175f9d8fc779551c0a4103ceb4b473552928207d7d78ae329e10

2 files changed, 12 insertions, 1 deletions

diff --git a/src/test/fuzz/process_message.cpp b/src/test/fuzz/process_message.cpp
index 3ef03137ec..9390399878 100644
--- a/src/test/fuzz/process_message.cpp
+++ b/src/test/fuzz/process_message.cpp
@@ -16,6 +16,7 @@
 #include <test/util/mining.h>
 #include <test/util/net.h>
 #include <test/util/setup_common.h>
+#include <test/util/validation.h>
 #include <util/memory.h>
 #include <validationinterface.h>
 #include <version.h>
@@ -63,10 +64,14 @@ void test_one_input(const std::vector<uint8_t>& buffer)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
     ConnmanTestMsg& connman = *(ConnmanTestMsg*)g_setup->m_node.connman.get();
+    TestChainState& chainstate = *(TestChainState*)&g_setup->m_node.chainman->ActiveChainstate();
+    chainstate.ResetIbd();
     const std::string random_message_type{fuzzed_data_provider.ConsumeBytesAsString(CMessageHeader::COMMAND_SIZE).c_str()};
     if (!LIMIT_TO_MESSAGE_TYPE.empty() && random_message_type != LIMIT_TO_MESSAGE_TYPE) {
         return;
     }
+    const bool jump_out_of_ibd{fuzzed_data_provider.ConsumeBool()};
+    if (jump_out_of_ibd) chainstate.JumpOutOfIbd();
     CDataStream random_bytes_data_stream{fuzzed_data_provider.ConsumeRemainingBytes<unsigned char>(), SER_NETWORK, PROTOCOL_VERSION};
     CNode& p2p_node = *MakeUnique<CNode>(0, ServiceFlags(NODE_NETWORK | NODE_WITNESS | NODE_BLOOM), 0, INVALID_SOCKET, CAddress{CService{in_addr{0x0100007f}, 7777}, NODE_NETWORK}, 0, 0, CAddress{}, std::string{}, ConnectionType::OUTBOUND_FULL_RELAY).release();
     p2p_node.fSuccessfullyConnected = true;
@@ -76,7 +81,7 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     g_setup->m_node.peerman->InitializeNode(&p2p_node);
     try {
         g_setup->m_node.peerman->ProcessMessage(p2p_node, random_message_type, random_bytes_data_stream,
-                                                   GetTime<std::chrono::microseconds>(), std::atomic<bool>{false});
+                                                GetTime<std::chrono::microseconds>(), std::atomic<bool>{false});
     } catch (const std::ios_base::failure&) {
     }
     SyncWithValidationInterfaceQueue();
diff --git a/src/test/fuzz/process_messages.cpp b/src/test/fuzz/process_messages.cpp
index f722eeac3a..19ea92b750 100644
--- a/src/test/fuzz/process_messages.cpp
+++ b/src/test/fuzz/process_messages.cpp
@@ -12,6 +12,7 @@
 #include <test/util/mining.h>
 #include <test/util/net.h>
 #include <test/util/setup_common.h>
+#include <test/util/validation.h>
 #include <util/memory.h>
 #include <validation.h>
 #include <validationinterface.h>
@@ -39,7 +40,10 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
 
     ConnmanTestMsg& connman = *(ConnmanTestMsg*)g_setup->m_node.connman.get();
+    TestChainState& chainstate = *(TestChainState*)&g_setup->m_node.chainman->ActiveChainstate();
+    chainstate.ResetIbd();
     std::vector<CNode*> peers;
+    bool jump_out_of_ibd{false};
 
     const auto num_peers_to_add = fuzzed_data_provider.ConsumeIntegralInRange(1, 3);
     for (int i = 0; i < num_peers_to_add; ++i) {
@@ -58,6 +62,8 @@ void test_one_input(const std::vector<uint8_t>& buffer)
     }
 
     while (fuzzed_data_provider.ConsumeBool()) {
+        if (!jump_out_of_ibd) jump_out_of_ibd = fuzzed_data_provider.ConsumeBool();
+        if (jump_out_of_ibd && chainstate.IsInitialBlockDownload()) chainstate.JumpOutOfIbd();
         const std::string random_message_type{fuzzed_data_provider.ConsumeBytesAsString(CMessageHeader::COMMAND_SIZE).c_str()};
 
         CSerializedNetMsg net_msg;