Merge bitcoin/bitcoin#28873: fuzz: AutoFile with XOR

faa2571 fuzz: AutoFile with XOR (MarcoFalke)
fab5cb9 fuzz: Reduce LIMITED_WHILE limit for file fuzzing (MarcoFalke)
fa5388f fuzz: Remove FuzzedAutoFileProvider (MarcoFalke)

Pull request description:

  This should help to get fuzz coverage for https://maflcko.github.io/b-c-cov/fuzz.coverage/src/streams.cpp.gcov.html

  Also, remove unused code and fix a timeout bug.

ACKs for top commit:
  dergoegge:
    ACK faa2571

Tree-SHA512: 56f1e6fd5cb2b66ffd9a7d9c09c9b8e396be3e7485feb03b35b6bd3c48e624fdaed50b472e4ffec21f09efb5e949d7ee32a13851849c9140b6b4cf25917dd7ac

Author: fanquake

src/test/fuzz/autofile.cpp

@@ -2,24 +2,28 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <span.h>
 #include <streams.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
 
 #include <array>
-#include <cstdint>
+#include <cstddef>
+#include <cstdio>
 #include <iostream>
-#include <optional>
-#include <string>
 #include <vector>
 
 FUZZ_TARGET(autofile)
 {
     FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
-    FuzzedAutoFileProvider fuzzed_auto_file_provider = ConsumeAutoFile(fuzzed_data_provider);
-    AutoFile auto_file{fuzzed_auto_file_provider.open()};
-    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
+    FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
+    AutoFile auto_file{
+        fuzzed_file_provider.open(),
+        ConsumeRandomLengthByteVector<std::byte>(fuzzed_data_provider),
+    };
+    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 100)
+    {
         CallOneOf(
             fuzzed_data_provider,
             [&] {

src/test/fuzz/buffered_file.cpp

@@ -2,31 +2,37 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <span.h>
 #include <streams.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
 
 #include <array>
+#include <cstddef>
 #include <cstdint>
 #include <iostream>
 #include <optional>
-#include <string>
 #include <vector>
 
 FUZZ_TARGET(buffered_file)
 {
     FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
-    FuzzedFileProvider fuzzed_file_provider = ConsumeFile(fuzzed_data_provider);
+    FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
     std::optional<BufferedFile> opt_buffered_file;
-    CAutoFile fuzzed_file{fuzzed_file_provider.open(), 0};
+    CAutoFile fuzzed_file{
+        fuzzed_file_provider.open(),
+        0,
+        ConsumeRandomLengthByteVector<std::byte>(fuzzed_data_provider),
+    };
     try {
         opt_buffered_file.emplace(fuzzed_file, fuzzed_data_provider.ConsumeIntegralInRange<uint64_t>(0, 4096), fuzzed_data_provider.ConsumeIntegralInRange<uint64_t>(0, 4096));
     } catch (const std::ios_base::failure&) {
     }
     if (opt_buffered_file && !fuzzed_file.IsNull()) {
         bool setpos_fail = false;
-        LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
+        LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 100)
+        {
             CallOneOf(
                 fuzzed_data_provider,
                 [&] {

src/test/fuzz/load_external_block_file.cpp

@@ -27,7 +27,7 @@ void initialize_load_external_block_file()
 FUZZ_TARGET(load_external_block_file, .init = initialize_load_external_block_file)
 {
     FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
-    FuzzedFileProvider fuzzed_file_provider = ConsumeFile(fuzzed_data_provider);
+    FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
     CAutoFile fuzzed_block_file{fuzzed_file_provider.open(), CLIENT_VERSION};
     if (fuzzed_block_file.IsNull()) {
         return;

src/test/fuzz/policy_estimator.cpp

@@ -13,6 +13,7 @@
 #include <test/fuzz/util/mempool.h>
 #include <test/util/setup_common.h>
 
+#include <memory>
 #include <optional>
 #include <vector>
 
@@ -81,8 +82,8 @@ FUZZ_TARGET(policy_estimator, .init = initialize_policy_estimator)
         (void)block_policy_estimator.HighestTargetTracked(fuzzed_data_provider.PickValueInArray(ALL_FEE_ESTIMATE_HORIZONS));
     }
     {
-        FuzzedAutoFileProvider fuzzed_auto_file_provider = ConsumeAutoFile(fuzzed_data_provider);
-        AutoFile fuzzed_auto_file{fuzzed_auto_file_provider.open()};
+        FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
+        AutoFile fuzzed_auto_file{fuzzed_file_provider.open()};
         block_policy_estimator.Write(fuzzed_auto_file);
         block_policy_estimator.Read(fuzzed_auto_file);
     }

src/test/fuzz/policy_estimator_io.cpp

@@ -4,13 +4,13 @@
 
 #include <policy/fees.h>
 #include <policy/fees_args.h>
+#include <streams.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
 #include <test/util/setup_common.h>
 
-#include <cstdint>
-#include <vector>
+#include <memory>
 
 namespace {
 const BasicTestingSetup* g_setup;
@@ -25,8 +25,8 @@ void initialize_policy_estimator_io()
 FUZZ_TARGET(policy_estimator_io, .init = initialize_policy_estimator_io)
 {
     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
-    FuzzedAutoFileProvider fuzzed_auto_file_provider = ConsumeAutoFile(fuzzed_data_provider);
-    AutoFile fuzzed_auto_file{fuzzed_auto_file_provider.open()};
+    FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
+    AutoFile fuzzed_auto_file{fuzzed_file_provider.open()};
     // Re-using block_policy_estimator across runs to avoid costly creation of CBlockPolicyEstimator object.
     static CBlockPolicyEstimator block_policy_estimator{FeeestPath(*g_setup->m_node.args), DEFAULT_ACCEPT_STALE_FEE_ESTIMATES};
     if (block_policy_estimator.Read(fuzzed_auto_file)) {

src/test/fuzz/util.h

@@ -263,31 +263,6 @@ class FuzzedFileProvider
     static int close(void* cookie);
 };
 
-[[nodiscard]] inline FuzzedFileProvider ConsumeFile(FuzzedDataProvider& fuzzed_data_provider) noexcept
-{
-    return {fuzzed_data_provider};
-}
-
-class FuzzedAutoFileProvider
-{
-    FuzzedFileProvider m_fuzzed_file_provider;
-
-public:
-    FuzzedAutoFileProvider(FuzzedDataProvider& fuzzed_data_provider) : m_fuzzed_file_provider{fuzzed_data_provider}
-    {
-    }
-
-    AutoFile open()
-    {
-        return AutoFile{m_fuzzed_file_provider.open()};
-    }
-};
-
-[[nodiscard]] inline FuzzedAutoFileProvider ConsumeAutoFile(FuzzedDataProvider& fuzzed_data_provider) noexcept
-{
-    return {fuzzed_data_provider};
-}
-
 #define WRITE_TO_STREAM_CASE(type, consume) \
     [&] {                                   \
         type o = consume;                   \

src/test/fuzz/validation_load_mempool.cpp

@@ -38,7 +38,7 @@ FUZZ_TARGET(validation_load_mempool, .init = initialize_validation_load_mempool)
 {
     FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
     SetMockTime(ConsumeTime(fuzzed_data_provider));
-    FuzzedFileProvider fuzzed_file_provider = ConsumeFile(fuzzed_data_provider);
+    FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};
 
     CTxMemPool pool{MemPoolOptionsForTest(g_setup->m_node)};