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/mman.h>
18 #include <sys/types.h>
19
20 #include <gtest/gtest.h>
21
22 #ifdef __ANDROID__
23 #include <bionic/mte.h>
24 #endif
25
26 #include "MemoryLocal.h"
27 #include "MemoryRemote.h"
28 #include "PidUtils.h"
29 #include "TestUtils.h"
30
31 namespace unwindstack {
32
CreateTagMapping()33 static uintptr_t CreateTagMapping() {
34 #if defined(__aarch64__)
35 uintptr_t mapping =
36 reinterpret_cast<uintptr_t>(mmap(nullptr, getpagesize(), PROT_READ | PROT_WRITE | PROT_MTE,
37 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
38 if (reinterpret_cast<void*>(mapping) == MAP_FAILED) {
39 return 0;
40 }
41 __asm__ __volatile__(".arch_extension mte; stg %0, [%0]"
42 :
43 : "r"(mapping + (1ULL << 56))
44 : "memory");
45 return mapping;
46 #else
47 return 0;
48 #endif
49 }
50
TEST(MemoryMteTest,remote_read_tag)51 TEST(MemoryMteTest, remote_read_tag) {
52 #if !defined(__aarch64__)
53 GTEST_SKIP() << "Requires aarch64";
54 #else
55 if (!mte_supported()) {
56 GTEST_SKIP() << "Requires MTE";
57 }
58 #endif
59
60 uintptr_t mapping = CreateTagMapping();
61 ASSERT_NE(0U, mapping);
62
63 pid_t pid;
64 if ((pid = fork()) == 0) {
65 while (true)
66 ;
67 exit(1);
68 }
69 ASSERT_LT(0, pid);
70 TestScopedPidReaper reap(pid);
71
72 ASSERT_TRUE(Attach(pid));
73
74 MemoryRemote remote(pid);
75
76 EXPECT_EQ(1, remote.ReadTag(mapping));
77 EXPECT_EQ(0, remote.ReadTag(mapping + 16));
78
79 ASSERT_TRUE(Detach(pid));
80 }
81
TEST(MemoryMteTest,local_read_tag)82 TEST(MemoryMteTest, local_read_tag) {
83 #if !defined(__aarch64__)
84 GTEST_SKIP() << "Requires aarch64";
85 #else
86 if (!mte_supported()) {
87 GTEST_SKIP() << "Requires MTE";
88 }
89 #endif
90
91 uintptr_t mapping = CreateTagMapping();
92 ASSERT_NE(0U, mapping);
93
94 MemoryLocal local;
95
96 EXPECT_EQ(1, local.ReadTag(mapping));
97 EXPECT_EQ(0, local.ReadTag(mapping + 16));
98 }
99
100 } // namespace unwindstack
101