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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) International Business Machines Corp., 2001
4  * Ported to LTP: Wayne Boyer
5  *	06/2017 Modified by Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
6  */
7 /*
8  * DESCRIPTION
9  *	1. open a new file without O_CREAT, ENOENT should be returned.
10  *	2. open a file with O_RDONLY | O_NOATIME and the caller was not
11  *	   privileged, EPERM should be returned.
12  */
13 
14 #define _GNU_SOURCE
15 
16 #include <stdio.h>
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <pwd.h>
22 #include "tst_test.h"
23 
24 #define TEST_FILE	"test_file"
25 #define TEST_FILE2	"test_file2"
26 
27 static struct tcase {
28 	const char *filename;
29 	int flag;
30 	int exp_errno;
31 	const char *desc;
32 } tcases[] = {
33 	{TEST_FILE, O_RDWR, ENOENT, "new file without O_CREAT"},
34 	{TEST_FILE2, O_RDONLY | O_NOATIME, EPERM, "unpriviledget O_RDONLY | O_NOATIME"},
35 };
36 
setup(void)37 void setup(void)
38 {
39 	struct passwd *ltpuser;
40 
41 	SAFE_TOUCH(TEST_FILE2, 0644, NULL);
42 
43 	ltpuser = SAFE_GETPWNAM("nobody");
44 
45 	SAFE_SETEUID(ltpuser->pw_uid);
46 }
47 
verify_open(unsigned int n)48 static void verify_open(unsigned int n)
49 {
50 	struct tcase *tc = &tcases[n];
51 
52 	TST_EXP_FAIL2(open(tc->filename, tc->flag, 0444),
53 	             tc->exp_errno, "open() %s", tc->desc);
54 }
55 
cleanup(void)56 void cleanup(void)
57 {
58 	SAFE_SETEUID(0);
59 }
60 
61 static struct tst_test test = {
62 	.tcnt = ARRAY_SIZE(tcases),
63 	.needs_root = 1,
64 	.needs_tmpdir = 1,
65 	.setup = setup,
66 	.cleanup = cleanup,
67 	.test = verify_open,
68 };
69