hostsidetests/securitybulletin/src/android/security/cts/CVE_2020_0461.java

/**
 * 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.
 */

package android.security.cts;

import android.platform.test.annotations.SecurityTest;
import org.junit.Test;
import org.junit.runner.RunWith;
import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;

import static org.junit.Assume.assumeTrue;
import static org.junit.Assume.assumeThat;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.*;

@RunWith(DeviceJUnit4ClassRunner.class)
public class CVE_2020_0461 extends SecurityTestCase {

    /**
     * b/162741784
     */
    @Test
    @SecurityTest(minPatchLevel = "2020-11")
    public void testPocCVE_2020_0461() throws Exception {
        //conditions
        String cpu = AdbUtils.runCommandLine("getprop ro.product.cpu.abi", getDevice());
        assumeThat(cpu, equalTo("arm64-v8a"));
        assumeTrue(containsDriver(getDevice(), "/proc/config.gz"));
        assumeTrue(containsDriver(getDevice(),
            "/sys/devices/system/cpu/vulnerabilities/meltdown"));
        String meltdown = AdbUtils.runCommandLine(
            "cat /sys/devices/system/cpu/vulnerabilities/meltdown", getDevice());
        assumeThat(meltdown, equalTo("Vulnerable"));

        //test
        AdbUtils.runCommandLine("cp /proc/config.gz /data/local/tmp", getDevice());
        AdbUtils.runCommandLine("gunzip /data/local/tmp/config.gz", getDevice());
        String output = AdbUtils.runCommandLine(
            "grep CONFIG_UNMAP_KERNEL_AT_EL0 /data/local/tmp/config", getDevice());
        AdbUtils.runCommandLine("rm /data/local/tmp/config", getDevice());

        // This is a bad output
        // "" - empty output
        // "CONFIG_UNMAP_KERNEL_AT_EL0 is not set"
        assertFalse(output.isEmpty());
        assertNotMatches("is not set", output);
    }
}