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 <stdlib.h>
18 #include <stdio.h>
19 #include "gwp_asan.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");
25 clear_log(GWP_ASAN_LOG_DIR, GWP_ASAN_LOG_TAG);
26 exit(0);
27 }
28
install_sigv_handler()29 static void install_sigv_handler()
30 {
31 struct sigaction sigv = {
32 .sa_handler = buffer_underflow_handler,
33 .sa_flags = 0,
34 };
35 sigaction(SIGSEGV, &sigv, NULL);
36 }
37
38 /*
39 *
40 *|--guard area--|--malloc area--|--guard area--|
41 * ^
42 */
main()43 int main()
44 {
45 clear_log(GWP_ASAN_LOG_DIR, GWP_ASAN_LOG_TAG);
46 install_sigv_handler();
47 char *ptr = (char *)malloc(sysconf(_SC_PAGE_SIZE));
48 if (!ptr) {
49 return 0;
50 }
51 if (!libc_gwp_asan_ptr_is_mine(ptr)) {
52 t_error("FAIL enter gwp_asan malloc failed!\n");
53 }
54 char c = *(ptr - 1);
55 printf("c:%c", c);
56 return 0;
57 }