Add end to end test for mtectrl.

Bug: 255628885
Change-Id: Ie03b40b8702fa45ea9f8ba2d022975d5cc9024dd

Author: fmayer

Diff for: mtectrl/Android.bp

@@ -40,3 +40,11 @@ cc_test {
     "libgmock",
   ]
 }
+
+java_test_host {
+    name: "mtectrl_end_to_end_test",
+    libs: ["tradefed"],
+    static_libs: ["frameworks-base-hostutils", "cts-install-lib-host"],
+    srcs:  ["src/com/android/tests/mtectrl/MtectrlEndToEndTest.java"],
+    test_suites: ["general-tests"],
+}

Diff for: mtectrl/src/com/android/tests/mtectrl/MtectrlEndToEndTest.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+package com.android.tests.mtectrl;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.junit.Assume.assumeThat;
+
+import com.android.tradefed.invoker.TestInformation;
+import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;
+import com.android.tradefed.testtype.junit4.AfterClassWithInfo;
+import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
+import com.android.tradefed.testtype.junit4.BeforeClassWithInfo;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+// Test the protocol described in
+// https://source.android.com/docs/security/test/memory-safety/bootloader-support.
+// This will reboot the device multiple times, which is perfectly normal.
+
+@RunWith(DeviceJUnit4ClassRunner.class)
+public class MtectrlEndToEndTest extends BaseHostJUnit4Test {
+    private static String mPreviousState = null;
+
+    @BeforeClassWithInfo
+    public static void setUp(TestInformation testInfo) throws Exception {
+        assumeThat(
+                testInfo.getDevice().getProperty("ro.arm64.memtag.bootctl_supported"),
+                equalTo("1"));
+        mPreviousState = testInfo.getDevice().getProperty("arm64.memtag.bootctl");
+        if (mPreviousState == null) {
+            mPreviousState = "";
+        }
+    }
+
+    @AfterClassWithInfo
+    public static void tearDown(TestInformation testInfo) throws Exception {
+        if (mPreviousState != null) {
+            testInfo.getDevice().setProperty("arm64.memtag.bootctl", mPreviousState);
+            testInfo.getDevice().reboot();
+        }
+    }
+
+    @Test
+    public void testMemtagOnce() throws Exception {
+        getDevice().setProperty("arm64.memtag.bootctl", "memtag-once");
+        getDevice().reboot();
+        assertThat(getDevice().getProperty("arm64.memtag.bootctl")).isAnyOf("", "none", null);
+        assertThat(getDevice().pullFileContents("/proc/cpuinfo")).contains("mte");
+        getDevice().reboot();
+        assertThat(getDevice().getProperty("arm64.memtag.bootctl")).isAnyOf("", "none", null);
+        assertThat(getDevice().pullFileContents("/proc/cpuinfo")).doesNotContain("mte");
+    }
+
+    @Test
+    public void testMemtag() throws Exception {
+        getDevice().setProperty("arm64.memtag.bootctl", "memtag");
+        getDevice().reboot();
+        assertThat(getDevice().getProperty("arm64.memtag.bootctl")).isEqualTo("memtag");
+        assertThat(getDevice().pullFileContents("/proc/cpuinfo")).contains("mte");
+        getDevice().reboot();
+        assertThat(getDevice().getProperty("arm64.memtag.bootctl")).isEqualTo("memtag");
+        assertThat(getDevice().pullFileContents("/proc/cpuinfo")).contains("mte");
+    }
+
+    @Test
+    public void testBoth() throws Exception {
+        getDevice().setProperty("arm64.memtag.bootctl", "memtag,memtag-once");
+        getDevice().reboot();
+        assertThat(getDevice().getProperty("arm64.memtag.bootctl")).isEqualTo("memtag");
+        assertThat(getDevice().pullFileContents("/proc/cpuinfo")).contains("mte");
+        getDevice().reboot();
+        assertThat(getDevice().getProperty("arm64.memtag.bootctl")).isEqualTo("memtag");
+        assertThat(getDevice().pullFileContents("/proc/cpuinfo")).contains("mte");
+    }
+}