1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) 2013 Fujitsu Ltd.
5 * Copyright (c) Linux Test Project, 2003-2023
6 * Ported to LTP: Wayne Boyer
7 * 11/2013 Ported by Xiaoguang Wang <[email protected]>
8 * 11/2016 Modified by Guangwen Feng <[email protected]>
9 */
10
11 /*\
12 * [Description]
13 *
14 * - access() fails with -1 return value and sets errno to EINVAL
15 * if the specified access mode argument is invalid.
16 * - access() fails with -1 return value and sets errno to ENOENT
17 * if the specified file doesn't exist (or pathname is NULL).
18 * - access() fails with -1 return value and sets errno to ENAMETOOLONG
19 * if the pathname size is > PATH_MAX characters.
20 * - access() fails with -1 return value and sets errno to ENOTDIR
21 * if a component used as a directory in pathname is not a directory.
22 * - access() fails with -1 return value and sets errno to ELOOP
23 * if too many symbolic links were encountered in resolving pathname.
24 * - access() fails with -1 return value and sets errno to EROFS
25 * if write permission was requested for files on a read-only file system.
26 */
27
28 #include <errno.h>
29 #include <pwd.h>
30 #include <string.h>
31 #include <sys/mount.h>
32 #include <sys/types.h>
33 #include <unistd.h>
34
35 #include "tst_test.h"
36
37 #define FNAME1 "accessfile1"
38 #define FNAME2 "accessfile2/accessfile2"
39 #define DNAME "accessfile2"
40 #define SNAME1 "symlink1"
41 #define SNAME2 "symlink2"
42 #define MNT_POINT "mntpoint"
43 #define LONGPATHSIZE (PATH_MAX + 2)
44
45 static uid_t uid;
46 static char *longpathname;
47 static char *fname1;
48 static char *fname2;
49 static char *sname1;
50 static char *empty_fname;
51 static char *mnt_point;
52
53 static struct tcase {
54 char **pathname;
55 int mode;
56 int exp_errno;
57 } tcases[] = {
58 {&fname1, -1, EINVAL},
59 {&empty_fname, W_OK, ENOENT},
60 {&longpathname, R_OK, ENAMETOOLONG},
61 {&fname2, R_OK, ENOTDIR},
62 {&sname1, R_OK, ELOOP},
63 {&mnt_point, W_OK, EROFS}
64 };
65
access_test(struct tcase * tc,const char * user)66 static void access_test(struct tcase *tc, const char *user)
67 {
68 TST_EXP_FAIL(access(*tc->pathname, tc->mode), tc->exp_errno,
69 "access as %s", user);
70 }
71
verify_access(unsigned int n)72 static void verify_access(unsigned int n)
73 {
74 struct tcase *tc = tcases + n;
75 pid_t pid;
76
77 access_test(tc, "root");
78
79 pid = SAFE_FORK();
80 if (pid) {
81 SAFE_WAITPID(pid, NULL, 0);
82 } else {
83 SAFE_SETUID(uid);
84 access_test(tc, "nobody");
85 }
86 }
87
setup(void)88 static void setup(void)
89 {
90 struct passwd *pw;
91
92 pw = SAFE_GETPWNAM("nobody");
93
94 uid = pw->pw_uid;
95
96 memset(longpathname, 'a', LONGPATHSIZE - 1);
97 longpathname[LONGPATHSIZE-1] = 0;
98
99 SAFE_TOUCH(FNAME1, 0333, NULL);
100 SAFE_TOUCH(DNAME, 0644, NULL);
101
102 SAFE_SYMLINK(SNAME1, SNAME2);
103 SAFE_SYMLINK(SNAME2, SNAME1);
104 }
105
106 static struct tst_test test = {
107 .tcnt = ARRAY_SIZE(tcases),
108 .needs_root = 1,
109 .forks_child = 1,
110 .needs_rofs = 1,
111 .mntpoint = MNT_POINT,
112 .setup = setup,
113 .test = verify_access,
114 .bufs = (struct tst_buffers []) {
115 {&fname1, .str = FNAME1},
116 {&fname2, .str = FNAME2},
117 {&sname1, .str = SNAME1},
118 {&empty_fname, .str = ""},
119 {&longpathname, .size = LONGPATHSIZE},
120 {&mnt_point, .str = MNT_POINT},
121 {}
122 }
123 };
124