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33574c17 | 1 | /* Test the stack guard. |
04277e02 | 2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
33574c17 ST |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
ad2b41bf ST |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
33574c17 ST |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
ad2b41bf | 13 | Lesser General Public License for more details. |
33574c17 | 14 | |
ad2b41bf ST |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
33574c17 ST |
18 | |
19 | #define _GNU_SOURCE | |
20 | ||
21 | #include <pthread.h> | |
22 | #include <assert.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <stdio.h> | |
27 | ||
28 | size_t stacksize; | |
29 | ||
30 | void * | |
31 | thr (void *arg) | |
32 | { | |
33 | int i; | |
34 | char *foo; | |
35 | ||
36 | foo = alloca (3 * stacksize / 4); | |
37 | for (i = 0; i < sizeof foo; i++) | |
38 | foo[i] = -1; | |
39 | ||
40 | return (void *) 1; | |
41 | } | |
42 | ||
43 | int | |
44 | main (int argc, char *argv[]) | |
45 | { | |
46 | error_t err; | |
47 | pid_t child; | |
48 | ||
49 | child = fork (); | |
50 | switch (child) | |
51 | { | |
52 | case -1: | |
53 | error (1, errno, "fork"); | |
54 | break; | |
55 | ||
56 | case 0: | |
57 | { | |
58 | pthread_attr_t attr; | |
59 | pthread_t tid; | |
60 | void *ret; | |
61 | ||
62 | err = pthread_attr_init (&attr); | |
63 | assert_perror (err); | |
64 | ||
65 | err = pthread_attr_getstacksize (&attr, &stacksize); | |
66 | assert_perror (err); | |
67 | ||
68 | err = pthread_attr_setguardsize (&attr, stacksize / 2); | |
69 | if (err == ENOTSUP) | |
70 | { | |
71 | printf ("Stack guard attribute not supported.\n"); | |
72 | return 1; | |
73 | } | |
74 | assert_perror (err); | |
75 | ||
76 | err = pthread_create (&tid, &attr, thr, 0); | |
77 | assert_perror (err); | |
78 | ||
79 | err = pthread_attr_destroy (&attr); | |
80 | assert_perror (err); | |
81 | ||
82 | err = pthread_join (tid, &ret); | |
83 | /* Should never be successful. */ | |
84 | printf ("Thread did not segfault!?!\n"); | |
85 | assert_perror (err); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | default: | |
90 | { | |
91 | pid_t pid; | |
92 | int status; | |
93 | ||
94 | pid = waitpid (child, &status, 0); | |
95 | printf ("pid = %d; child = %d; status = %d\n", pid, child, status); | |
96 | assert (pid == child); | |
97 | assert (status != 0); | |
98 | } | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } |