trusty: Fuzzer for Gatekeeper TA

Test: /data/fuzz/arm64/trusty_gatekeeper_fuzzer/trusty_gatekeeper_fuzzer
Change-Id: If55b93b1a15c5bd9a1148ff54a859635a6e7290c

trusty/gatekeeper/fuzz/Android.bp

@@ -0,0 +1,19 @@
+// 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.
+
+cc_fuzz {
+    name: "trusty_gatekeeper_fuzzer",
+    defaults: ["trusty_fuzzer_defaults"],
+    srcs: ["fuzz.cpp"],
+}

trusty/gatekeeper/fuzz/fuzz.cpp

@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#undef NDEBUG
+
+#include <assert.h>
+#include <log/log.h>
+#include <stdlib.h>
+#include <trusty/fuzz/utils.h>
+#include <unistd.h>
+
+#define TIPC_DEV "/dev/trusty-ipc-dev0"
+#define GATEKEEPER_PORT "com.android.trusty.gatekeeper"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+    static uint8_t buf[TIPC_MAX_MSG_SIZE];
+
+    android::trusty::fuzz::TrustyApp ta(TIPC_DEV, GATEKEEPER_PORT);
+
+    auto ret = ta.Connect();
+    /*
+     * If we can't connect, then assume TA crashed.
+     * TODO: Get some more info, e.g. stacks, to help Haiku dedup crashes.
+     */
+    assert(ret.ok());
+
+    /* Send message to test server */
+    ret = ta.Write(data, size);
+    if (!ret.ok()) {
+        return -1;
+    }
+
+    /* Read message from test server */
+    ret = ta.Read(&buf, sizeof(buf));
+    if (!ret.ok()) {
+        return -1;
+    }
+
+    return 0;
+}