xref: /aosp_15_r20/external/ltp/testcases/kernel/syscalls/fchdir/fchdir03.c (revision 49cdfc7efb34551c7342be41a7384b9c40d7cab7)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) Bull S.A. 2001
 * Copyright (c) International Business Machines Corp., 2001
 * Copyright (c) 2017 Cyril Hrubis <[email protected]>
 */

/*
 * DESCRIPTION
 *	Testcase for testing that fchdir(2) sets EACCES errno
 *
 * ALGORITHM
 *	1.	create a child process, sets its uid to ltpuser1
 *	2.	this child creates a directory with perm 400,
 *	3.	this child opens the directory and gets a file descriptor
 *	4.	this child attempts to fchdir(2) to the directory created in 2.
 *		and expects to get an EACCES.
 */

#include <errno.h>
#include <pwd.h>
#include "tst_test.h"

#define DIRNAME "fchdir03_dir"

static int fd;

void verify_fchdir(void)
{
	TEST(fchdir(fd));

	if (TST_RET != -1) {
		tst_res(TFAIL, "fchdir() succeeded unexpectedly");
		return;
	}

	if (TST_ERR != EACCES) {
		tst_res(TFAIL | TTERRNO, "fchdir() should fail with EACCES");
		return;
	}

	tst_res(TPASS | TTERRNO, "fchdir() failed expectedly");
}

void setup(void)
{
	struct passwd *pw;

	pw = SAFE_GETPWNAM("nobody");
	SAFE_SETEUID(pw->pw_uid);
	SAFE_MKDIR(DIRNAME, 0400);

	fd = SAFE_OPEN(DIRNAME, O_RDONLY);
}

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