1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * 07/2001 Ported by Wayne Boyer
5 * Copyright (c) 2021 Xie Ziyao <xieziyao@huawei.com>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Verify that:
12 *
13 * 1. fchown() returns -1 and sets errno to EPERM if the effective user id
14 * of process does not match the owner of the file and the process is
15 * not super user.
16 * 2. fchown() returns -1 and sets errno to EBADF if the file descriptor
17 * of the specified file is not valid.
18 * 3. fchown() returns -1 and sets errno to EROFS if the named file resides
19 * on a read-only file system.
20 */
21
22 #include <pwd.h>
23
24 #include "tst_test.h"
25 #include "compat_tst_16.h"
26 #include "tst_safe_macros.h"
27
28 #define MNT_POINT "mntpoint"
29 #define TEST_FILE "tfile_1"
30 #define MODE 0666
31 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
32
33 static int fd1;
34 static int fd2 = -1;
35 static int fd3;
36
37 static struct test_case_t {
38 int *fd;
39 int exp_errno;
40 } tc[] = {
41 {&fd1, EPERM},
42 {&fd2, EBADF},
43 {&fd3, EROFS},
44 };
45
setup(void)46 static void setup(void)
47 {
48 struct passwd *ltpuser;
49
50 fd1 = SAFE_OPEN(TEST_FILE, O_RDWR | O_CREAT, MODE);
51 fd3 = SAFE_OPEN(MNT_POINT, O_RDONLY);
52
53 ltpuser = SAFE_GETPWNAM("nobody");
54 SAFE_SETEUID(ltpuser->pw_uid);
55 }
56
run(unsigned int i)57 static void run(unsigned int i)
58 {
59 uid_t uid;
60 gid_t gid;
61
62 UID16_CHECK((uid = geteuid()), "fchown");
63 GID16_CHECK((gid = getegid()), "fchown");
64
65 TST_EXP_FAIL(FCHOWN(*tc[i].fd, uid, gid), tc[i].exp_errno,
66 "fchown(%i, %i, %i)", *tc[i].fd, uid, gid);
67 }
68
cleanup(void)69 static void cleanup(void)
70 {
71 if (fd1 > 0)
72 SAFE_CLOSE(fd1);
73
74 if (fd3 > 0)
75 SAFE_CLOSE(fd3);
76 }
77
78 static struct tst_test test = {
79 .needs_root = 1,
80 .needs_rofs = 1,
81 .mntpoint = MNT_POINT,
82 .tcnt = ARRAY_SIZE(tc),
83 .test = run,
84 .setup = setup,
85 .cleanup = cleanup,
86 };
87