105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* Check the usability of <dlfcn.h> functions in audit modules. Audit module.
|
|
Copyright (C) 2022 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);
|
|
|
|
/* 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;
|
|
}
|