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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).
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <gnu/lib-names.h>
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#include <stdio.h>
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#include <support/support.h>
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#include <unistd.h>
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int
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main (void)
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{
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char *libc = xasprintf ("%s/%s", support_slibdir_prefix, LIBC_SO);
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char *argv[] = { libc, NULL };
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char *envp[] = { (char *) "LD_PRELOAD=" LIBPTHREAD_SO,
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/* Relocation ordering matters most without lazy binding. */
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(char *) "LD_BIND_NOW=1",
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NULL };
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execve (libc, argv, envp);
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printf ("execve of %s failed: %m\n", libc);
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return 1;
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}
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