// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2018 Petr Vorel <pvorel@suse.cz>
 * Copyright (C) 2018 Michael Moese <mmoese@suse.de>
 *
 * cve-2018-1000001 realpath buffer underflow
 * Based on the reproducer posted upstream so other copyrights may apply.
 * Author: Dmitry V. Levin <ldv@altlinux.org>
 * LTP conversion from glibc source: Petr Vorel <pvorel@suse.cz>
 */

#include "tst_test.h"

#include <errno.h>
#include <stdlib.h>

#define CHROOT_DIR "cve-2018-1000001"

static void setup(void)
{
	SAFE_MKDIR(CHROOT_DIR, 0755);
	SAFE_CHROOT(CHROOT_DIR);
}

static void run(void)
{
	TESTPTR(realpath(".", NULL));

	if (TST_ERR != ENOENT) {
		tst_res(TFAIL | TTERRNO, "returned unexpected errno");
	} else	if (TST_RET_PTR != NULL) {
		tst_res(TFAIL, "syscall didn't return NULL: '%s'",
				(char *)TST_RET_PTR);
	} else {
		tst_res(TPASS, "bug not reproduced");
	}
}

static struct tst_test test = {
	.test_all = run,
	.setup = setup,
	.needs_root = 1,
	.needs_tmpdir = 1,
};