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fada901819
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).
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Check that dlfcn errors are reported properly after dlmopen.
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Copyright (C) 2021 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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<http://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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static int
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do_test (void)
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{
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void *handle = xdlmopen (LM_ID_NEWLM, "tst-dlmopen-dlerror-mod.so",
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RTLD_NOW);
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void (*call_dlsym) (const char *name) = xdlsym (handle, "call_dlsym");
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void (*call_dlopen) (const char *name) = xdlsym (handle, "call_dlopen");
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/* Iterate over various name lengths. This changes the size of
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error messages allocated by ld.so and has been shown to trigger
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detectable heap corruption if malloc/free calls in different
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namespaces are mixed. */
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char buffer[2048];
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char *buffer_end = &buffer[sizeof (buffer) - 2];
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for (char *p = stpcpy (buffer, "does not exist "); p < buffer_end; ++p)
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{
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p[0] = 'X';
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p[1] = '\0';
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call_dlsym (buffer);
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call_dlopen (buffer);
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}
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return 0;
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}
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#include <support/test-driver.c>
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