144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/* Test recursive dlopen using malloc hooks.
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Copyright (C) 2015 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 <stdio.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include <dlfcn.h>
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#define DSO "moddummy1.so"
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#define FUNC "dummy1"
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#define DSO1 "moddummy2.so"
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#define FUNC1 "dummy2"
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/* Result of the called function. */
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int func_result;
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/* Prototype for my hook. */
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void *custom_malloc_hook (size_t, const void *);
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/* Pointer to old malloc hooks. */
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void *(*old_malloc_hook) (size_t, const void *);
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/* Call function func_name in DSO dso_name via dlopen. */
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void
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call_func (const char *dso_name, const char *func_name)
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{
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int ret;
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void *dso;
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int (*func) (void);
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char *err;
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/* Open the DSO. */
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dso = dlopen (dso_name, RTLD_NOW|RTLD_GLOBAL);
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if (dso == NULL)
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{
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err = dlerror ();
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fprintf (stderr, "%s\n", err);
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exit (1);
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}
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/* Clear any errors. */
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dlerror ();
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/* Lookup func. */
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*(void **) (&func) = dlsym (dso, func_name);
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if (func == NULL)
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{
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err = dlerror ();
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if (err != NULL)
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{
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fprintf (stderr, "%s\n", err);
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exit (1);
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}
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}
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/* Call func. */
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func_result = (*func) ();
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/* Close the library and look for errors too. */
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ret = dlclose (dso);
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if (ret != 0)
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{
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err = dlerror ();
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fprintf (stderr, "%s\n", err);
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exit (1);
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}
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}
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/* Empty hook that does nothing. */
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void *
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custom_malloc_hook (size_t size, const void *caller)
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{
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void *result;
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/* Restore old hooks. */
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__malloc_hook = old_malloc_hook;
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/* First call a function in another library via dlopen. */
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call_func (DSO1, FUNC1);
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/* Called recursively. */
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result = malloc (size);
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/* Restore new hooks. */
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__malloc_hook = custom_malloc_hook;
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return result;
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}
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static int
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do_test (void)
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{
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/* Save old hook. */
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old_malloc_hook = __malloc_hook;
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/* Install new hook. */
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__malloc_hook = custom_malloc_hook;
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/* Bug 17702 fixes two things:
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* A recursive dlopen unmapping the ld.so.cache.
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* An assertion that _r_debug is RT_CONSISTENT at entry to dlopen.
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We can only test the latter. Testing the former requires modifying
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ld.so.conf to cache the dummy libraries, then running ldconfig,
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then run the test. If you do all of that (and glibc's test
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infrastructure doesn't support that yet) then the test will
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SEGFAULT without the fix. If you don't do that, then the test
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will abort because of the assert described in detail below. */
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call_func (DSO, FUNC);
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/* Restore old hook. */
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__malloc_hook = old_malloc_hook;
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/* The function dummy2() is called by the malloc hook. Check to
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see that it was called. This ensures the second recursive
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dlopen happened and we called the function in that library.
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Before the fix you either get a SIGSEGV when accessing mmap'd
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ld.so.cache data or an assertion failure about _r_debug not
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beint RT_CONSISTENT. We don't test for the SIGSEGV since it
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would require finding moddummy1 or moddummy2 in the cache and
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we don't have any infrastructure to test that, but the _r_debug
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assertion triggers. */
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printf ("Returned result is %d\n", func_result);
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if (func_result <= 0)
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{
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printf ("FAIL: Function call_func() not called.\n");
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exit (1);
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}
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printf ("PASS: Function call_func() called more than once.\n");
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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