1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <sys/cdefs.h>
18
19 #if defined(__BIONIC__)
20
21 #include <gtest/gtest.h>
22
23 #include <android-base/macros.h>
24 #include <bionic/mte.h>
25 #include "utils.h"
26
27 __attribute__((no_sanitize("hwaddress")))
test_tag_mismatch()28 static void test_tag_mismatch() {
29 std::unique_ptr<int[]> p = std::make_unique<int[]>(4);
30 p[0] = 1;
31 int* mistagged_p ATTRIBUTE_UNUSED =
32 reinterpret_cast<int*>(reinterpret_cast<uintptr_t>(p.get()) + (1ULL << 56));
33 {
34 ScopedDisableMTE x;
35 // Test that nested ScopedDisableMTE does not reset MTE state.
36 { ScopedDisableMTE y; }
37 #if defined(__aarch64__)
38 volatile int load ATTRIBUTE_UNUSED = *mistagged_p;
39 #endif
40 }
41 #if defined(__aarch64__)
42 if (mte_supported() && running_with_mte()) {
43 EXPECT_DEATH(
44 {
45 volatile int load ATTRIBUTE_UNUSED = *mistagged_p;
46 },
47 "");
48 }
49 #endif
50 }
51
TEST(mte_test,ScopedDisableMTE)52 TEST(mte_test, ScopedDisableMTE) {
53 // With native_bridge, native and emulated parts exchange data, including pointers.
54 // This implies tagging on native and emulated architectures should match, which is
55 // not the case at the moment.
56 SKIP_WITH_NATIVE_BRIDGE;
57
58 test_tag_mismatch();
59 }
60
61 #endif // __BIONIC__
62