tests/tests/os/src/android/os/cts/SecurityFeaturesTest.java

/*
 * Copyright (C) 2013 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.os.cts;

import junit.framework.TestCase;

public class SecurityFeaturesTest extends TestCase {

    public void testNoNewPrivs() {
        int newPrivs = OSFeatures.getNoNewPrivs();
        // if newPrivs == -1, then old kernel with no PR_SET_NO_NEW_PRIVS (acceptable)
        // if newPrivs == 0,  then new kernel with PR_SET_NO_NEW_PRIVS disabled (BAD)
        // if newPrivs == 1,  then new kernel with PR_SET_NO_NEW_PRIVS enabled (GOOD)
        assertTrue(newPrivs != 0);
    }

    /**
     * Iterate over all possible capabilities, testing to make sure each capability
     * has been removed from the app's capability bounding set.
     */
    public void testPrCapbsetEmpty() {
        int i = 0;
        while (true) {
            int result = OSFeatures.prctlCapBsetRead(i);
            if (result == -1) {
                // The kernel has told us that the capability we're inquiring about
                // doesn't exist. Capabilities are assigned sequentially and
                // and monotonically increase with each kernel release, so if we
                // see -1, we know we've examined every capability the kernel
                // knows about.
                break;
            }
            assertEquals("capability " + i + " is still in the bounding set",
                         0, result);
            i++;
        }
    }
}