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/* Check the usability of <dlfcn.h> functions in audit modules. Audit module.
Copyright (C) 2022-2024 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 <dlfcn.h>
#include <first-versions.h>
#include <gnu/lib-names.h>
#include <link.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <support/check.h>
#include <support/xdlfcn.h>
unsigned int
la_version (unsigned int current)
{
/* Exercise various <dlfcn.h> functions. */
/* Check dlopen, dlsym, dlclose. */
void *handle = xdlopen (LIBM_SO, RTLD_LOCAL | RTLD_NOW);
void *ptr = xdlsym (handle, "sincos");
TEST_VERIFY (ptr != NULL);
ptr = dlsym (handle, "SINCOS");
TEST_VERIFY (ptr == NULL);
const char *message = dlerror ();
TEST_VERIFY (strstr (message, ": undefined symbol: SINCOS") != NULL);
ptr = dlsym (handle, "SINCOS");
TEST_VERIFY (ptr == NULL);
xdlclose (handle);
TEST_COMPARE_STRING (dlerror (), NULL);
handle = xdlopen (LIBC_SO, RTLD_LOCAL | RTLD_NOW | RTLD_NOLOAD);
/* Check dlvsym. _exit is unlikely to gain another symbol
version. */
TEST_VERIFY (xdlsym (handle, "_exit")
== xdlvsym (handle, "_exit", FIRST_VERSION_libc__exit_STRING));
/* Check dlinfo. */
{
void *handle2 = NULL;
TEST_COMPARE (dlinfo (handle, RTLD_DI_LINKMAP, &handle2), 0);
TEST_VERIFY (handle2 == handle);
}
/* Check dladdr and dladdr1. */
Dl_info info = { };
TEST_VERIFY (dladdr (&_exit, &info) != 0);
if (strcmp (info.dli_sname, "_Exit") != 0) /* _Exit is an alias. */
TEST_COMPARE_STRING (info.dli_sname, "_exit");
TEST_VERIFY (info.dli_saddr == &_exit);
TEST_VERIFY (strstr (info.dli_fname, LIBC_SO));
void *extra_info;
memset (&info, 0, sizeof (info));
TEST_VERIFY (dladdr1 (&_exit, &info, &extra_info, RTLD_DL_LINKMAP) != 0);
TEST_VERIFY (extra_info == handle);
/* Check _dl_find_object. */
struct dl_find_object dlfo;
void *ret_addr = __builtin_extract_return_addr (__builtin_return_address (0));
int ret_dl_find_object =_dl_find_object (ret_addr, &dlfo);
TEST_COMPARE (ret_dl_find_object, 0);
if (ret_dl_find_object == 0)
{
/* "ld.so" is seen with --enable-hardcoded-path-in-tests. */
if (strcmp (basename (dlfo.dlfo_link_map->l_name), "ld.so") != 0)
TEST_COMPARE_STRING (basename (dlfo.dlfo_link_map->l_name), LD_SO);
}
ret_dl_find_object = _dl_find_object (dlsym (handle, "environ"), &dlfo);
TEST_COMPARE (ret_dl_find_object, 0);
if (ret_dl_find_object == 0)
TEST_COMPARE_STRING (basename (dlfo.dlfo_link_map->l_name), LIBC_SO);
TEST_COMPARE (_dl_find_object ((void *) 1, &dlfo), -1);
TEST_COMPARE (_dl_find_object ((void *) -1, &dlfo), -1);
/* Verify that dlmopen creates a new namespace. */
void *dlmopen_handle = xdlmopen (LM_ID_NEWLM, LIBC_SO, RTLD_NOW);
TEST_VERIFY (dlmopen_handle != handle);
memset (&info, 0, sizeof (info));
extra_info = NULL;
ptr = xdlsym (dlmopen_handle, "_exit");
TEST_VERIFY (dladdr1 (ptr, &info, &extra_info, RTLD_DL_LINKMAP) != 0);
TEST_VERIFY (extra_info == dlmopen_handle);
xdlclose (dlmopen_handle);
/* Terminate the process with an error state. This does not happen
automatically because the audit module state is not shared with
the main program. */
if (support_record_failure_is_failed ())
{
fflush (stdout);
fflush (stderr);
_exit (1);
}
return LAV_CURRENT;
}
char *
la_objsearch (const char *name, uintptr_t *cookie, unsigned int flag)
{
if (strcmp (name, "mapped to libc") == 0)
return (char *) LIBC_SO;
else
return (char *) name;
}
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