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 #if defined(ANDROID_EXPERIMENTAL_MTE)
18
19 #include <sys/mman.h>
20 #include <sys/types.h>
21
22 #include <gtest/gtest.h>
23
24 #include <bionic/mte.h>
25
26 #include "MemoryLocal.h"
27 #include "MemoryRemote.h"
28 #include "TestUtils.h"
29
30 namespace unwindstack {
31
CreateTagMapping()32 static uintptr_t CreateTagMapping() {
33 uintptr_t mapping =
34 reinterpret_cast<uintptr_t>(mmap(nullptr, getpagesize(), PROT_READ | PROT_WRITE | PROT_MTE,
35 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
36 if (reinterpret_cast<void*>(mapping) == MAP_FAILED) {
37 return 0;
38 }
39 #if defined(__aarch64__)
40 __asm__ __volatile__(".arch_extension mte; stg %0, [%0]"
41 :
42 : "r"(mapping + (1ULL << 56))
43 : "memory");
44 #endif
45 return mapping;
46 }
47
TEST(MemoryMteTest,remote_read_tag)48 TEST(MemoryMteTest, remote_read_tag) {
49 #if !defined(__aarch64__)
50 GTEST_SKIP() << "Requires aarch64";
51 #else
52 if (!mte_supported()) {
53 GTEST_SKIP() << "Requires MTE";
54 }
55 #endif
56
57 uintptr_t mapping = CreateTagMapping();
58 ASSERT_NE(0U, mapping);
59
60 pid_t pid;
61 if ((pid = fork()) == 0) {
62 while (true)
63 ;
64 exit(1);
65 }
66 ASSERT_LT(0, pid);
67 TestScopedPidReaper reap(pid);
68
69 ASSERT_TRUE(TestAttach(pid));
70
71 MemoryRemote remote(pid);
72
73 EXPECT_EQ(1, remote.ReadTag(mapping));
74 EXPECT_EQ(0, remote.ReadTag(mapping + 16));
75
76 ASSERT_TRUE(TestDetach(pid));
77 }
78
TEST(MemoryMteTest,local_read_tag)79 TEST(MemoryMteTest, local_read_tag) {
80 #if !defined(__aarch64__)
81 GTEST_SKIP() << "Requires aarch64";
82 #else
83 if (!mte_supported()) {
84 GTEST_SKIP() << "Requires MTE";
85 }
86 #endif
87
88 uintptr_t mapping = CreateTagMapping();
89 ASSERT_NE(0U, mapping);
90
91 MemoryLocal local;
92
93 EXPECT_EQ(1, local.ReadTag(mapping));
94 EXPECT_EQ(0, local.ReadTag(mapping + 16));
95 }
96
97 } // namespace unwindstack
98
99 #endif
100