1/* Check that dlfcn errors are reported properly after dlmopen.
2 Copyright (C) 2021-2022 Free Software Foundation, Inc.
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
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.
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
13 Lesser General Public License for more details.
14
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/>. */
18
19#include <stddef.h>
20#include <string.h>
21#include <support/check.h>
22#include <support/xdlfcn.h>
23
24static int
25do_test (void)
26{
27 void *handle = xdlmopen (LM_ID_NEWLM, filename: "tst-dlmopen-dlerror-mod.so",
28 RTLD_NOW);
29 void (*call_dlsym) (const char *name) = xdlsym (handle, symbol: "call_dlsym");
30 void (*call_dlopen) (const char *name) = xdlsym (handle, symbol: "call_dlopen");
31
32 /* Iterate over various name lengths. This changes the size of
33 error messages allocated by ld.so and has been shown to trigger
34 detectable heap corruption if malloc/free calls in different
35 namespaces are mixed. */
36 char buffer[2048];
37 char *buffer_end = &buffer[sizeof (buffer) - 2];
38 for (char *p = stpcpy (buffer, "does not exist "); p < buffer_end; ++p)
39 {
40 p[0] = 'X';
41 p[1] = '\0';
42 call_dlsym (buffer);
43 call_dlopen (buffer);
44 }
45
46 return 0;
47}
48
49#include <support/test-driver.c>
50

source code of glibc/elf/tst-dlmopen-dlerror.c