1 files changed, 83 insertions, 0 deletions
diff --git a/libs/binder/tests/parcel_fuzzer/random_parcel.cpp b/libs/binder/tests/parcel_fuzzer/random_parcel.cpp
new file mode 100644
index 0000000000..b045a22eff
--- /dev/null
+++ b/libs/binder/tests/parcel_fuzzer/random_parcel.cpp
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 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 <fuzzbinder/random_parcel.h>
+
+#include <android-base/logging.h>
+#include <binder/IServiceManager.h>
+#include <fuzzbinder/random_fd.h>
+#include <utils/String16.h>
+
+namespace android {
+
+class NamedBinder : public BBinder {
+public:
+    NamedBinder(const String16& descriptor) : mDescriptor(descriptor) {}
+    const String16& getInterfaceDescriptor() const override { return mDescriptor; }
+
+private:
+    String16 mDescriptor;
+};
+
+void fillRandomParcel(Parcel* p, FuzzedDataProvider&& provider) {
+    while (provider.remaining_bytes() > 0) {
+        auto fillFunc = provider.PickValueInArray<const std::function<void()>>({
+                // write data
+                [&]() {
+                    size_t toWrite =
+                            provider.ConsumeIntegralInRange<size_t>(0, provider.remaining_bytes());
+                    std::vector<uint8_t> data = provider.ConsumeBytes<uint8_t>(toWrite);
+                    CHECK(OK == p->write(data.data(), data.size()));
+                },
+                // write FD
+                [&]() {
+                    int fd = getRandomFd(&provider);
+                    CHECK(OK == p->writeFileDescriptor(fd, true /*takeOwnership*/));
+                },
+                // write binder
+                [&]() {
+                    auto makeFunc = provider.PickValueInArray<const std::function<sp<IBinder>()>>({
+                            [&]() {
+                                // descriptor is the length of a class name, e.g.
+                                // "some.package.Foo"
+                                std::string str =
+                                        provider.ConsumeRandomLengthString(100 /*max length*/);
+                                return new NamedBinder(String16(str.c_str()));
+                            },
+                            []() {
+                                // this is the easiest remote binder to get ahold of, and it
+                                // should be able to handle anything thrown at it, and
+                                // essentially every process can talk to it, so it's a good
+                                // candidate for checking usage of an actual BpBinder
+                                return IInterface::asBinder(defaultServiceManager());
+                            },
+                            []() { return nullptr; },
+                    });
+                    sp<IBinder> binder = makeFunc();
+                    CHECK(OK == p->writeStrongBinder(binder));
+                },
+        });
+
+        fillFunc();
+    }
+}
+
+void fillRandomParcelData(Parcel* p, FuzzedDataProvider&& provider) {
+    std::vector<uint8_t> data = provider.ConsumeBytes<uint8_t>(provider.remaining_bytes());
+    CHECK(OK == p->write(data.data(), data.size()));
+}
+
+} // namespace android