1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/*
* 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 android.security.cts;
import static android.system.OsConstants.F_GETFL;
import static android.system.OsConstants.O_NOFOLLOW;
import static org.junit.Assert.assertEquals;
import static org.junit.Assume.assumeNoException;
import static org.junit.Assume.assumeNotNull;
import static org.junit.Assume.assumeTrue;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.platform.test.annotations.AppModeFull;
import android.platform.test.annotations.AsbSecurityTest;
import android.provider.MediaStore;
import android.system.ErrnoException;
import android.system.Os;
import androidx.test.InstrumentationRegistry;
import androidx.test.runner.AndroidJUnit4;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.io.FileDescriptor;
import java.io.IOException;
@AppModeFull
@RunWith(AndroidJUnit4.class)
public class CVE_2021_39663 {
@Test
@AsbSecurityTest(cveBugId = 200682135)
public void testPocCVE_2021_39663() {
Context context = InstrumentationRegistry.getInstrumentation().getContext();
ContentResolver contentResolver = context.getContentResolver();
try {
Uri uri = contentResolver.insert(MediaStore.Downloads.EXTERNAL_CONTENT_URI,
new ContentValues());
ParcelFileDescriptor pfd = context.getContentResolver().openFileDescriptor(uri, "rw");
assumeNotNull(pfd);
FileDescriptor fd = pfd.getFileDescriptor();
int flags = Os.fcntlInt(fd, F_GETFL, 0);
pfd.close();
contentResolver.delete(uri, null, null);
assumeTrue("Unable to read file status flags", flags > 0);
assertEquals("Vulnerable to b/200682135!! O_NOFOLLOW flag not used.", O_NOFOLLOW,
flags & O_NOFOLLOW);
} catch (ErrnoException | IOException e) {
assumeNoException(e);
}
}
}
|
