glibc/elf/tst-dlmopen-dlerror-mod.c
Florian Weimer fada901819 dlfcn: dlerror needs to call free from the base namespace [BZ ]
Calling free directly may end up freeing a pointer allocated by the
dynamic loader using malloc from libc.so in the base namespace using
the allocator from libc.so in a secondary namespace, which results in
crashes.

This commit redirects the free call through GLRO and the dynamic
linker, to reach the correct namespace.  It also cleans up the dlerror
handling along the way, so that pthread_setspecific is no longer
needed (which avoids triggering bug 24774).
2021-04-21 19:49:51 +02:00

59 lines
2.2 KiB
C

/* Check that dlfcn errors are reported properly after dlmopen. Test module.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>
/* Note: This object is not linked into the main program, so we cannot
use delayed test failure reporting via TEST_VERIFY etc., and have
to use FAIL_EXIT1 (or something else that calls exit). */
void
call_dlsym (const char *name)
{
void *ptr = dlsym (NULL, name);
if (ptr != NULL)
FAIL_EXIT1 ("dlsym did not fail as expected for: %s", name);
const char *message = dlerror ();
if (strstr (message, ": undefined symbol: does not exist X") == NULL)
FAIL_EXIT1 ("invalid dlsym error message for [[%s]]: %s", name, message);
message = dlerror ();
if (message != NULL)
FAIL_EXIT1 ("second dlsym for [[%s]]: %s", name, message);
}
void
call_dlopen (const char *name)
{
void *handle = dlopen (name, RTLD_NOW);
if (handle != NULL)
FAIL_EXIT1 ("dlopen did not fail as expected for: %s", name);
const char *message = dlerror ();
if (strstr (message, "X: cannot open shared object file:"
" No such file or directory") == NULL
&& strstr (message, "X: cannot open shared object file:"
" File name too long") == NULL)
FAIL_EXIT1 ("invalid dlopen error message for [[%s]]: %s", name, message);
message = dlerror ();
if (message != NULL)
FAIL_EXIT1 ("second dlopen for [[%s]]: %s", name, message);
}