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 */
6
7 /*
8 * Testcase to check creat(2) fails with EACCES
9 */
10
11 #include <stdio.h>
12 #include <errno.h>
13 #include <fcntl.h>
14 #include <pwd.h>
15 #include <sys/types.h>
16 #include <sys/stat.h>
17
18 #include "tst_test.h"
19
20 #define DIRNAME "testdir"
21 #define FILENAME DIRNAME"/file1"
22
23 static uid_t nobody_uid;
24
25 static struct tcase {
26 const char *fname;
27 } tcases[] = {
28 {DIRNAME "/file"},
29 {FILENAME}
30 };
31
child_fn(unsigned int i)32 static void child_fn(unsigned int i)
33 {
34 SAFE_SETEUID(nobody_uid);
35
36 TEST(creat(tcases[i].fname, 0444));
37
38 if (TST_RET != -1) {
39 SAFE_UNLINK(tcases[i].fname);
40 tst_res(TFAIL, "call succeeded unexpectedly");
41 return;
42 }
43
44 if (TST_ERR != EACCES) {
45 tst_res(TFAIL | TTERRNO, "Expected EACCES");
46 return;
47 }
48
49 tst_res(TPASS, "call failed with EACCES as expected");
50 }
51
verify_creat(unsigned int i)52 static void verify_creat(unsigned int i)
53 {
54 if (SAFE_FORK() == 0)
55 child_fn(i);
56 }
57
setup(void)58 static void setup(void)
59 {
60 struct passwd *pw;
61 int fd;
62
63 pw = SAFE_GETPWNAM("nobody");
64 nobody_uid = pw->pw_uid;
65
66 SAFE_MKDIR(DIRNAME, 0700);
67 fd = SAFE_OPEN(FILENAME, O_RDWR | O_CREAT, 0444);
68 SAFE_CLOSE(fd);
69 }
70
71 static struct tst_test test = {
72 .tcnt = ARRAY_SIZE(tcases),
73 .test = verify_creat,
74 .needs_tmpdir = 1,
75 .needs_root = 1,
76 .forks_child = 1,
77 .setup = setup,
78 };
79