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/* Test case for ignored LD_LIBRARY_PATH in static startug (bug 32976).
Copyright (C) 2025 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 <gnu/lib-names.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <sys/wait.h>
#include <unistd.h>
/* This is the name of our test object. Use a custom module for
testing, so that this object does not get picked up from the system
path. */
static const char dso_name[] = "tst-dlopen-sgid-mod.so";
/* Used to mark the recursive invocation. */
static const char magic_argument[] = "run-actual-test";
static int
do_test (void)
{
/* Pathname of the directory that receives the shared objects this
test attempts to load. */
char *libdir = support_create_temp_directory ("tst-dlopen-sgid-");
/* This is supposed to be ignored and stripped. */
TEST_COMPARE (setenv ("LD_LIBRARY_PATH", libdir, 1), 0);
/* Copy of libc.so.6. */
{
char *from = xasprintf ("%s/%s", support_objdir_root, LIBC_SO);
char *to = xasprintf ("%s/%s", libdir, LIBC_SO);
add_temp_file (to);
support_copy_file (from, to);
free (to);
free (from);
}
/* Copy of the test object. */
{
char *from = xasprintf ("%s/elf/%s", support_objdir_root, dso_name);
char *to = xasprintf ("%s/%s", libdir, dso_name);
add_temp_file (to);
support_copy_file (from, to);
free (to);
free (from);
}
free (libdir);
support_capture_subprogram_self_sgid (magic_argument);
return 0;
}
static void
alternative_main (int argc, char **argv)
{
if (argc == 2 && strcmp (argv[1], magic_argument) == 0)
{
if (getgid () == getegid ())
/* This can happen if the file system is mounted nosuid. */
FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
(intmax_t) getgid ());
/* Should be removed due to SGID. */
TEST_COMPARE_STRING (getenv ("LD_LIBRARY_PATH"), NULL);
TEST_VERIFY (dlopen (dso_name, RTLD_NOW) == NULL);
{
const char *message = dlerror ();
TEST_COMPARE_STRING (message,
"tst-dlopen-sgid-mod.so:"
" cannot open shared object file:"
" No such file or directory");
}
support_record_failure_barrier ();
exit (EXIT_SUCCESS);
}
}
#define PREPARE alternative_main
#include <support/test-driver.c>
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