[vold] Add argument verification to IncFS methods

+ Get rid of an extra string copy in path validation function

Bug: 152349257
Test: atest vold_tests
Change-Id: I03a8cab0dd6abd7d5c9dcbbc2acb651e818e6cd8
diff --git a/tests/Android.bp b/tests/Android.bp
index 4731d0a..b90de3a 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -7,7 +7,9 @@
 
     srcs: [
         "Utils_test.cpp",
+        "VoldNativeServiceValidation_test.cpp",
         "cryptfs_test.cpp",
     ],
     static_libs: ["libvold"],
+    shared_libs: ["libbinder"]
 }
diff --git a/tests/VoldNativeServiceValidation_test.cpp b/tests/VoldNativeServiceValidation_test.cpp
new file mode 100644
index 0000000..0f87937
--- /dev/null
+++ b/tests/VoldNativeServiceValidation_test.cpp
@@ -0,0 +1,51 @@
+/*
+ * 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 "../VoldNativeServiceValidation.h"
+
+#include <gtest/gtest.h>
+
+#include <string_view>
+
+using namespace std::literals;
+
+namespace android::vold {
+
+class VoldServiceValidationTest : public testing::Test {};
+
+TEST_F(VoldServiceValidationTest, CheckArgumentPathTest) {
+    EXPECT_TRUE(CheckArgumentPath("/").isOk());
+    EXPECT_TRUE(CheckArgumentPath("/1/2").isOk());
+    EXPECT_TRUE(CheckArgumentPath("/1/2/").isOk());
+    EXPECT_TRUE(CheckArgumentPath("/1/2/./3").isOk());
+    EXPECT_TRUE(CheckArgumentPath("/1/2/./3/.").isOk());
+    EXPECT_TRUE(CheckArgumentPath(
+                        "/very long path with some/ spaces and quite/ uncommon names /in\1 it/")
+                        .isOk());
+
+    EXPECT_FALSE(CheckArgumentPath("").isOk());
+    EXPECT_FALSE(CheckArgumentPath("relative/path").isOk());
+    EXPECT_FALSE(CheckArgumentPath("../data/..").isOk());
+    EXPECT_FALSE(CheckArgumentPath("/../data/..").isOk());
+    EXPECT_FALSE(CheckArgumentPath("/data/../system").isOk());
+    EXPECT_FALSE(CheckArgumentPath("/data/..trick/../system").isOk());
+    EXPECT_FALSE(CheckArgumentPath("/data/..").isOk());
+    EXPECT_FALSE(CheckArgumentPath("/data/././../apex").isOk());
+    EXPECT_FALSE(CheckArgumentPath(std::string("/data/strange\0one"sv)).isOk());
+    EXPECT_FALSE(CheckArgumentPath(std::string("/data/strange\ntwo"sv)).isOk());
+}
+
+}  // namespace android::vold