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I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
179 lines
4.8 KiB
C
179 lines
4.8 KiB
C
/* Test recursive dlopen using malloc hooks.
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Copyright (C) 2015-2021 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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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <stdbool.h>
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#include <stdalign.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <string.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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/* 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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func = (int (*) (void)) 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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/* If true, call another function from malloc. */
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static bool call_function;
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/* Set to true to indicate that the interposed malloc was called. */
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static bool interposed_malloc_called;
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/* Interposed malloc which optionally calls another function. */
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void *
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malloc (size_t size)
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{
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interposed_malloc_called = true;
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static void *(*original_malloc) (size_t);
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if (original_malloc == NULL)
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{
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static bool in_initialization;
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if (in_initialization)
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{
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const char *message
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= "error: malloc called recursively during initialization\n";
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(void) write (STDOUT_FILENO, message, strlen (message));
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_exit (2);
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}
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in_initialization = true;
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original_malloc
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= (__typeof (original_malloc)) dlsym (RTLD_NEXT, "malloc");
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if (original_malloc == NULL)
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{
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const char *message
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= "error: dlsym for malloc failed\n";
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(void) write (STDOUT_FILENO, message, strlen (message));
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_exit (2);
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}
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}
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if (call_function)
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{
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call_function = false;
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call_func (DSO1, FUNC1);
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call_function = true;
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}
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return original_malloc (size);
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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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/* Ensure initialization. */
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{
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void *volatile ptr = malloc (1);
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free (ptr);
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}
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if (!interposed_malloc_called)
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{
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printf ("error: interposed malloc not called during initialization\n");
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return 1;
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}
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call_function = true;
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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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call_function = false;
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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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