mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-28 13:31:13 +00:00
9ffa50b26b
_dl_map_object_deps always sorts the initially loaded object first during dependency sorting. This means it is relocated last in dl_open_worker. This results in crashes in IFUNC resolvers without lazy bindings if libraries are preloaded that refer to IFUNCs in libc.so.6: the resolvers are called when libc.so.6 has not been relocated yet, so references to _rtld_global_ro etc. crash. The fix is to check against the libc.so.6 link map recorded by the __libc_early_init framework, and let it participate in the dependency sort. This fixes bug 20972. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
/* Test relocation ordering if the main executable is libc.so.6 (bug 20972).
|
|
Copyright (C) 2020 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <gnu/lib-names.h>
|
|
#include <stdio.h>
|
|
#include <support/support.h>
|
|
#include <unistd.h>
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
char *libc = xasprintf ("%s/%s", support_slibdir_prefix, LIBC_SO);
|
|
char *argv[] = { libc, NULL };
|
|
char *envp[] = { (char *) "LD_PRELOAD=" LIBPTHREAD_SO,
|
|
/* Relocation ordering matters most without lazy binding. */
|
|
(char *) "LD_BIND_NOW=1",
|
|
NULL };
|
|
execve (libc, argv, envp);
|
|
printf ("execve of %s failed: %m\n", libc);
|
|
return 1;
|
|
}
|