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, 50 insertions, 0 deletions

diff --git a/libutils/CallStack_fuzz.cpp b/libutils/CallStack_fuzz.cpp
new file mode 100644
index 000000000..e89b5b7ca
--- /dev/null
+++ b/libutils/CallStack_fuzz.cpp
@@ -0,0 +1,50 @@
+/*
+ * 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 <memory.h>
+
+#include "fuzzer/FuzzedDataProvider.h"
+#include "utils/CallStack.h"
+
+static constexpr int MAX_STRING_SIZE = 500;
+static constexpr int MAX_IGNORE_DEPTH = 200;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    FuzzedDataProvider dataProvider(data, size);
+    size_t ignoreDepth = dataProvider.ConsumeIntegralInRange<size_t>(0, MAX_IGNORE_DEPTH);
+    int logPriority = dataProvider.ConsumeIntegral<int>();
+    pid_t tid = dataProvider.ConsumeIntegral<pid_t>();
+    std::string logTag = dataProvider.ConsumeRandomLengthString(MAX_STRING_SIZE);
+    std::string prefix = dataProvider.ConsumeRandomLengthString(MAX_STRING_SIZE);
+
+    const char* logTagChars = logTag.c_str();
+    const char* prefixChars = prefix.c_str();
+
+    android::CallStack::CallStackUPtr callStack = android::CallStack::getCurrent(ignoreDepth);
+    android::CallStack* callstackPtr = callStack.get();
+    android::CallStack::logStack(logTagChars, callstackPtr,
+                                 static_cast<android_LogPriority>(logPriority));
+    android::CallStack::stackToString(prefixChars);
+
+    callstackPtr->log(logTagChars, static_cast<android_LogPriority>(logPriority), prefixChars);
+    callstackPtr->clear();
+    callstackPtr->getCurrent(ignoreDepth);
+    callstackPtr->log(logTagChars, static_cast<android_LogPriority>(logPriority), prefixChars);
+    callstackPtr->update(ignoreDepth, tid);
+    callstackPtr->log(logTagChars, static_cast<android_LogPriority>(logPriority), prefixChars);
+
+    return 0;
+}