1 /*
2 * Copyright (C) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <cstdlib>
17 #include <unistd.h>
18 #include <sys/wait.h>
19 #include <csignal>
20 #include <cerrno>
21 #include <cstring>
22 #include <gtest/gtest.h>
23
handler(int s)24 static void handler(int s)
25 {
26 }
27
28 #define UNIT 16
29 #define OFF_OFFSET 2
30 #define FIRST_OFFSET (-4)
31 #define FIRST_OFF_OFFSET 8
32 #define MALLOC_SIZE_S (10 * sizeof(uintptr_t))
33 #define TEST_NUM 512
34
35 using namespace testing::ext;
36 using namespace std;
37
38 class MallocModifyPointer : public testing::Test {
39 public:
40
41 static void SetUpTestCase();
42 static void TearDownTestCase();
43 void SetUp();
44 void TearDown();
45 private:
46 };
47
SetUp()48 void MallocModifyPointer::SetUp()
49 {
50 }
TearDown()51 void MallocModifyPointer::TearDown()
52 {
53 }
SetUpTestCase()54 void MallocModifyPointer::SetUpTestCase()
55 {
56 }
TearDownTestCase()57 void MallocModifyPointer::TearDownTestCase()
58 {
59 }
60
61 volatile void *tmp[TEST_NUM];
62
63 struct meta_in {
64 struct meta_in *prev, *next;
65 uintptr_t *mem;
66 };
67
68 struct group_in {
69 struct meta_in *meta;
70 };
71
get_group(volatile const uint8_t * p)72 static struct group_in *get_group(volatile const uint8_t *p)
73 {
74 volatile int offset = *(const uint16_t *)((uintptr_t)p - OFF_OFFSET);
75
76 if (p[FIRST_OFFSET]) {
77 offset = *(uintptr_t *)((uintptr_t)p - FIRST_OFF_OFFSET);
78 }
79 struct group_in *base = (struct group_in *)((uintptr_t)p - UNIT*offset - UNIT);
80 return base;
81 }
82
83
child(void)84 static int child(void)
85 {
86 void *p0;
87 struct group_in *g = nullptr;
88
89 p0 = malloc(MALLOC_SIZE_S);
90
91 tmp[0] = malloc(MALLOC_SIZE_S);
92 if ((tmp[0] == nullptr) || ((uintptr_t)tmp[0] & 15)) {
93 printf("Malloc failed:%s\n", strerror(errno));
94 return -1;
95 }
96
97 g = get_group((uint8_t *)tmp[0]);
98 g->meta++;
99
100 free((void *)tmp[0]);
101
102 for (int i = 0; i < TEST_NUM; ++i) {
103 tmp[i] = malloc(MALLOC_SIZE_S);
104 }
105
106 for (int i = 0; i < TEST_NUM; ++i) {
107 free((void *)tmp[i]);
108 }
109
110 return 0;
111 }
112
start_child(void)113 static pid_t start_child(void)
114 {
115 pid_t pid;
116 int ret;
117 pid = fork();
118 if (pid == 0) {
119 ret = child();
120 printf("child process normally out with %d\n", ret);
121 return ret;
122 }
123 return pid;
124 }
125
126 /*
127 * @tc.number MODIFY_POINTER_TEST_0100
128 * @tc.name Apply part of the memory camfree reduction
129 * @tc.desc Test the modifypointer
130 */
131 HWTEST_F(MallocModifyPointer, modifyPointerTest0100, Function | MediumTest | Level1) {
132 sigset_t set;
133 int status;
134 pid_t pid;
135 int flag = 0;
136 struct timespec time1 = {5, 0};
137
138 sigemptyset(&set);
139 sigaddset(&set, SIGCHLD);
140 sigprocmask(SIG_BLOCK, &set, 0);
141 signal(SIGCHLD, handler);
142
143 pid = start_child();
144 if (pid == -1) {
145 printf("fork failed: %s\n", strerror(errno));
146 }
147 if (sigtimedwait(&set, 0, &time1) == -1) { /* Wait for 5 seconds */
148 if (errno == EAGAIN) {
149 flag = 1;
150 }
151 else {
152 printf("sigtimedwait failed: %s\n", strerror(errno));
153 }
154 if (kill(pid, SIGKILL) == -1) {
155 printf("kill failed: %s\n", strerror(errno));
156 }
157 }
158
159 if (waitpid(pid, &status, 0) != pid) {
160 printf("waitpid failed: %s\n", strerror(errno));
161 }
162
163 if (flag) {
164 printf("Child process time out\n");
165 }
166
167 if (WIFSIGNALED(status)) {
168 ASSERT_TRUE(WTERMSIG(status) == SIGSEGV || WTERMSIG(status) == SIGILL) << "child process out with %s\n" <<
169 WTERMSIG(status);
170 } else {
171 ASSERT_TRUE(false) << "child process finished normally\n";
172 }
173 }
174