TEST_F(DlExtRelroSharingTest, VerifyMemorySaving) {
if (geteuid() != 0) {
GTEST_LOG_(INFO) << "This test must be run as root.\n";
return;
}
TemporaryFile tf; // Use tf to get an unique filename.
ASSERT_NOERROR(close(tf.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME, tf.filename));
int pipefd[2];
ASSERT_NOERROR(pipe(pipefd));
size_t without_sharing, with_sharing;
ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(LIBNAME, false, &without_sharing));
ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(LIBNAME, true, &with_sharing));
// We expect the sharing to save at least 10% of the total PSS. In practice
// it saves 40%+ for this test.
size_t expected_size = without_sharing - (without_sharing/10);
EXPECT_LT(with_sharing, expected_size);
// Use destructor of tf to close and unlink the file.
tf.fd = extinfo_.relro_fd;
}
TEST_F(DlExtRelroSharingTest, ChildWritesNoRelro) {
TemporaryFile tf; // // Use tf to get an unique filename.
ASSERT_NOERROR(close(tf.fd));
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME_NORELRO, tf.filename));
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(LIBNAME_NORELRO));
// Use destructor of tf to close and unlink the file.
tf.fd = extinfo_.relro_fd;
}
TEST_F(DlExtRelroSharingTest, VerifyMemorySaving) {
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME));
int relro_fd = open(relro_file_, O_RDONLY);
ASSERT_NOERROR(relro_fd);
extinfo_.flags |= ANDROID_DLEXT_USE_RELRO;
extinfo_.relro_fd = relro_fd;
int pipefd[2];
ASSERT_NOERROR(pipe(pipefd));
size_t without_sharing, with_sharing;
ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(LIBNAME, false, &without_sharing));
ASSERT_NO_FATAL_FAILURE(SpawnChildrenAndMeasurePss(LIBNAME, true, &with_sharing));
// We expect the sharing to save at least 10% of the total PSS. In practice
// it saves 40%+ for this test.
size_t expected_size = without_sharing - (without_sharing/10);
EXPECT_LT(with_sharing, expected_size);
}
TEST_F(DlExtRelroSharingTest, ChildWritesNoRelro) {
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME_NORELRO));
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(LIBNAME_NORELRO));
}
TEST_F(DlExtRelroSharingTest, ChildWritesGoodData) {
ASSERT_NO_FATAL_FAILURE(CreateRelroFile(LIBNAME));
ASSERT_NO_FATAL_FAILURE(TryUsingRelro(LIBNAME));
}
