Merge #18417: tests: Add fuzzing harnesses for functions in addrdb.h, net_permissions.h and timedata.h

4308aa67e3ea38e3fe5ac84e38a29df36c0d0e10 tests: Add fuzzing harness for functions in net_permissions.h (practicalswift)
43ff0d91f8a4af68e64fd12273133322d44a69ea tests: Add fuzzing harness for functions in timedata.h (practicalswift)
a8695db7851dabdda08b2ec9a68d6a27c0e2fdc4 tests: Add fuzzing harness for functions in addrdb.h (practicalswift)

Pull request description:

  Add fuzzing harnesses for functions in `addrdb.h`, `net_permissions.h` and `timedata.h`.

Top commit has no ACKs.

Tree-SHA512: ea41431e7f1944ecd0c102e6ea04e70d6763dc9b6e3a0949a4f7299897a92fa3e8e7139f9f65b9508ce8d45613ea24ec0fd6d4a8be3cfd7c23136512b17770eb

3 files changed, 123 insertions, 0 deletions

diff --git a/src/test/fuzz/addrdb.cpp b/src/test/fuzz/addrdb.cpp
new file mode 100644
index 0000000000..f21ff3fac3
--- /dev/null
+++ b/src/test/fuzz/addrdb.cpp
@@ -0,0 +1,43 @@
+// Copyright (c) 2020 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 <addrdb.h>
+#include <optional.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+
+    const CBanEntry ban_entry = [&] {
+        switch (fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 3)) {
+        case 0:
+            return CBanEntry{fuzzed_data_provider.ConsumeIntegral<int64_t>()};
+            break;
+        case 1:
+            return CBanEntry{fuzzed_data_provider.ConsumeIntegral<int64_t>(), fuzzed_data_provider.PickValueInArray<BanReason>({
+                                                                                  BanReason::BanReasonUnknown,
+                                                                                  BanReason::BanReasonNodeMisbehaving,
+                                                                                  BanReason::BanReasonManuallyAdded,
+                                                                              })};
+            break;
+        case 2: {
+            const Optional<CBanEntry> ban_entry = ConsumeDeserializable<CBanEntry>(fuzzed_data_provider);
+            if (ban_entry) {
+                return *ban_entry;
+            }
+            break;
+        }
+        }
+        return CBanEntry{};
+    }();
+    assert(!ban_entry.banReasonToString().empty());
+}
diff --git a/src/test/fuzz/net_permissions.cpp b/src/test/fuzz/net_permissions.cpp
new file mode 100644
index 0000000000..bfc5d21427
--- /dev/null
+++ b/src/test/fuzz/net_permissions.cpp
@@ -0,0 +1,51 @@
+// Copyright (c) 2020 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 <net_permissions.h>
+#include <optional.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+    const std::string s = fuzzed_data_provider.ConsumeRandomLengthString(32);
+    const NetPermissionFlags net_permission_flags = fuzzed_data_provider.ConsumeBool() ? fuzzed_data_provider.PickValueInArray<NetPermissionFlags>({
+                                                                                             NetPermissionFlags::PF_NONE,
+                                                                                             NetPermissionFlags::PF_BLOOMFILTER,
+                                                                                             NetPermissionFlags::PF_RELAY,
+                                                                                             NetPermissionFlags::PF_FORCERELAY,
+                                                                                             NetPermissionFlags::PF_NOBAN,
+                                                                                             NetPermissionFlags::PF_MEMPOOL,
+                                                                                             NetPermissionFlags::PF_ISIMPLICIT,
+                                                                                             NetPermissionFlags::PF_ALL,
+                                                                                         }) :
+                                                                                         static_cast<NetPermissionFlags>(fuzzed_data_provider.ConsumeIntegral<uint32_t>());
+
+    NetWhitebindPermissions net_whitebind_permissions;
+    std::string error_net_whitebind_permissions;
+    if (NetWhitebindPermissions::TryParse(s, net_whitebind_permissions, error_net_whitebind_permissions)) {
+        (void)NetPermissions::ToStrings(net_whitebind_permissions.m_flags);
+        (void)NetPermissions::AddFlag(net_whitebind_permissions.m_flags, net_permission_flags);
+        assert(NetPermissions::HasFlag(net_whitebind_permissions.m_flags, net_permission_flags));
+        (void)NetPermissions::ClearFlag(net_whitebind_permissions.m_flags, net_permission_flags);
+        (void)NetPermissions::ToStrings(net_whitebind_permissions.m_flags);
+    }
+
+    NetWhitelistPermissions net_whitelist_permissions;
+    std::string error_net_whitelist_permissions;
+    if (NetWhitelistPermissions::TryParse(s, net_whitelist_permissions, error_net_whitelist_permissions)) {
+        (void)NetPermissions::ToStrings(net_whitelist_permissions.m_flags);
+        (void)NetPermissions::AddFlag(net_whitelist_permissions.m_flags, net_permission_flags);
+        assert(NetPermissions::HasFlag(net_whitelist_permissions.m_flags, net_permission_flags));
+        (void)NetPermissions::ClearFlag(net_whitelist_permissions.m_flags, net_permission_flags);
+        (void)NetPermissions::ToStrings(net_whitelist_permissions.m_flags);
+    }
+}
diff --git a/src/test/fuzz/timedata.cpp b/src/test/fuzz/timedata.cpp
new file mode 100644
index 0000000000..a0e579a88f
--- /dev/null
+++ b/src/test/fuzz/timedata.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2020 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 <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+#include <timedata.h>
+
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+    const unsigned int max_size = fuzzed_data_provider.ConsumeIntegralInRange<unsigned int>(0, 1000);
+    // Divide by 2 to avoid signed integer overflow in .median()
+    const int64_t initial_value = fuzzed_data_provider.ConsumeIntegral<int64_t>() / 2;
+    CMedianFilter<int64_t> median_filter{max_size, initial_value};
+    while (fuzzed_data_provider.remaining_bytes() > 0) {
+        (void)median_filter.median();
+        assert(median_filter.size() > 0);
+        assert(static_cast<size_t>(median_filter.size()) == median_filter.sorted().size());
+        assert(static_cast<unsigned int>(median_filter.size()) <= max_size || max_size == 0);
+        // Divide by 2 to avoid signed integer overflow in .median()
+        median_filter.input(fuzzed_data_provider.ConsumeIntegral<int64_t>() / 2);
+    }
+}