Add second batch of fuzzers for libutils

This adds fuzzers for:
- CallStack
- Looper
- LruCache
- Printer
- ProcessCallStack
- PropertyMap
- RWLock
- RefBase
- StopWatch.
Test: Ran each fuzzer for 10 minutes. Rough coverage est. (likely far below actual value): 10.97%

Signed-off-by: Dylan Katz <dylan.katz@leviathansecurity.com>
Change-Id: I2f9f35c18b13338c282fb7f9c3ea4099ecb2c56f

1 files changed, 74 insertions, 0 deletions

diff --git a/libutils/LruCache_fuzz.cpp b/libutils/LruCache_fuzz.cpp
new file mode 100644
index 000000000..f8bacfcbc
--- /dev/null
+++ b/libutils/LruCache_fuzz.cpp
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <functional>
+
+#include "fuzzer/FuzzedDataProvider.h"
+#include "utils/LruCache.h"
+#include "utils/StrongPointer.h"
+
+typedef android::LruCache<size_t, size_t> FuzzCache;
+
+static constexpr uint32_t MAX_CACHE_ENTRIES = 800;
+
+class NoopRemovedCallback : public android::OnEntryRemoved<size_t, size_t> {
+  public:
+    void operator()(size_t&, size_t&) {
+        // noop
+    }
+};
+
+static NoopRemovedCallback callback;
+
+static const std::vector<std::function<void(FuzzedDataProvider*, FuzzCache*)>> operations = {
+        [](FuzzedDataProvider*, FuzzCache* cache) -> void { cache->removeOldest(); },
+        [](FuzzedDataProvider*, FuzzCache* cache) -> void { cache->peekOldestValue(); },
+        [](FuzzedDataProvider*, FuzzCache* cache) -> void { cache->clear(); },
+        [](FuzzedDataProvider*, FuzzCache* cache) -> void { cache->size(); },
+        [](FuzzedDataProvider*, FuzzCache* cache) -> void {
+            android::LruCache<size_t, size_t>::Iterator iter(*cache);
+            while (iter.next()) {
+                iter.key();
+                iter.value();
+            }
+        },
+        [](FuzzedDataProvider* dataProvider, FuzzCache* cache) -> void {
+            size_t key = dataProvider->ConsumeIntegral<size_t>();
+            size_t val = dataProvider->ConsumeIntegral<size_t>();
+            cache->put(key, val);
+        },
+        [](FuzzedDataProvider* dataProvider, FuzzCache* cache) -> void {
+            size_t key = dataProvider->ConsumeIntegral<size_t>();
+            cache->get(key);
+        },
+        [](FuzzedDataProvider* dataProvider, FuzzCache* cache) -> void {
+            size_t key = dataProvider->ConsumeIntegral<size_t>();
+            cache->remove(key);
+        },
+        [](FuzzedDataProvider*, FuzzCache* cache) -> void {
+            cache->setOnEntryRemovedListener(&callback);
+        }};
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    FuzzedDataProvider dataProvider(data, size);
+    FuzzCache cache(MAX_CACHE_ENTRIES);
+    while (dataProvider.remaining_bytes() > 0) {
+        uint8_t op = dataProvider.ConsumeIntegral<uint8_t>() % operations.size();
+        operations[op](&dataProvider, &cache);
+    }
+
+    return 0;
+}