1 /* Copyright (C) 2003-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <setjmp.h>
19 #include <signal.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <sys/types.h>
23
24 static sigjmp_buf jmpbuf;
25
26 static void
sig_handler(int signo)27 sig_handler (int signo)
28 {
29 siglongjmp (jmpbuf, 1);
30 }
31
32 static int
do_test(void)33 do_test (void)
34 {
35 char *p = NULL;
36 /* gcc can overwrite the success written value by scheduling instructions
37 around sprintf. It is allowed to do this since according to C99 the first
38 argument of sprintf is a character array and NULL is not a valid character
39 array. Mark the return value as volatile so that it gets reloaded on
40 return. */
41 volatile int ret = 0;
42
43 if (signal (SIGSEGV, &sig_handler) == SIG_ERR)
44 {
45 perror ("installing SIGSEGV handler");
46 return 1;
47 }
48
49 puts ("Attempting to sprintf to null ptr");
50 if (setjmp (jmpbuf))
51 {
52 puts ("Exiting main...");
53 return ret;
54 }
55
56 sprintf (p, "This should segv\n");
57
58 return 1;
59 }
60
61 #define TEST_FUNCTION do_test ()
62 #include "../test-skeleton.c"
63