1 /**
2 * Copyright (c) 2023 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 <signal.h>
17 #include <stdio.h>
18 #include <sys/wait.h>
19 #include "gwp_asan_test.h"
20 #include "test.h"
21
buffer_underflow_handler()22 void buffer_underflow_handler()
23 {
24 find_and_check_file(GWP_ASAN_LOG_DIR, GWP_ASAN_LOG_TAG, "Buffer Underflow", false);
25 find_and_check_file(GWP_ASAN_LOG_DIR, GWP_ASAN_LOG_TAG, "#0.*?gwp_asan", true);
26 clear_log(GWP_ASAN_LOG_DIR, GWP_ASAN_LOG_TAG);
27 cancel_gwp_asan_environment(true);
28 _exit(0);
29 }
30
install_sigv_handler()31 static void install_sigv_handler()
32 {
33 struct sigaction sigv = {
34 .sa_handler = buffer_underflow_handler,
35 .sa_flags = 0,
36 };
37 sigaction(SIGSEGV, &sigv, NULL);
38 }
39
buffer_underflow_test()40 void buffer_underflow_test()
41 {
42 config_gwp_asan_environment(true);
43 clear_log(GWP_ASAN_LOG_DIR, GWP_ASAN_LOG_TAG);
44 install_sigv_handler();
45
46 char *ptr = (char *)malloc(sysconf(_SC_PAGE_SIZE));
47 if (!ptr) {
48 t_error("malloc failed.");
49 return;
50 }
51 if (!libc_gwp_asan_ptr_is_mine(ptr)) {
52 t_error("FAIL enter gwp_asan malloc failed!\n");
53 return;
54 }
55 char c = *(ptr - 1);
56 printf("c:%c", c);
57 }
58
59 /*
60 *
61 *|--guard area--|--malloc area--|--guard area--|
62 * ^
63 */
main()64 int main()
65 {
66 pid_t pid = fork();
67 if (pid < 0) {
68 t_error("FAIL fork failed.");
69 } else if (pid == 0) { // child process
70 buffer_underflow_test();
71 } else { // parent process
72 int status;
73 if (waitpid(pid, &status, 0) != pid) {
74 t_error("gwp_asan_buffer_underflow_test waitpid failed.");
75 }
76
77 if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
78 t_error("gwp_asan_buffer_underflow_test failed.");
79 }
80
81 cancel_gwp_asan_environment(true);
82 }
83
84 return t_status;
85 }
86