1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
4 * Nirmala Devi Dhanasekar <[email protected]>
5 * Copyright (c) Linux Test Project, 2005-2023
6 * Copyright (C) 2024 SUSE LLC Andrea Cervesato <[email protected]>
7 */
8
9 /*\
10 * [Description]
11 *
12 * Check for basic errors returned by mount(2) system call.
13 *
14 * - ENODEV if filesystem type not configured
15 * - ENOTBLK if specialfile is not a block device
16 * - EBUSY if specialfile is already mounted or it cannot be remounted
17 * read-only, because it still holds files open for writing.
18 * - EINVAL if specialfile or device is invalid or a remount was attempted,
19 * while source was not already mounted on target.
20 * - EFAULT if special file or device file points to invalid address space.
21 * - ENAMETOOLONG if pathname was longer than MAXPATHLEN.
22 * - ENOENT if pathname was empty or has a nonexistent component.
23 * - ENOTDIR if not a directory.
24 */
25
26 #include "tst_test.h"
27 #include <sys/mount.h>
28
29 #define MNTPOINT "mntpoint"
30 #define TEST_FILE MNTPOINT"/file"
31
32 static char path[PATH_MAX + 2];
33 static const char *long_path = path;
34 static const char *device;
35 static const char *fs_type;
36 static const char *null;
37 static const char *wrong_fs_type = "error";
38 static const char *mntpoint = MNTPOINT;
39 static const char *fault;
40 static const char *nonexistent = "nonexistent";
41 static const char *char_dev = "char_device";
42 static const char *file = "filename";
43 static int fd;
44
45 static void pre_mount(void);
46 static void post_umount(void);
47 static void pre_create_file(void);
48 static void post_delete_file(void);
49
50 static struct test_case {
51 const char **device;
52 const char **mntpoint;
53 const char **fs_type;
54 const char *desc;
55 unsigned long flag;
56 int exp_errno;
57 void (*setup)(void);
58 void (*cleanup)(void);
59 } test_cases[] = {
60 {.fs_type = &wrong_fs_type, .desc = "wrong FS type", .exp_errno = ENODEV},
61 {.device = &char_dev, .desc = "char device", .exp_errno = ENOTBLK},
62 {.desc = "mounted folder", .exp_errno = EBUSY, .setup = pre_mount, .cleanup = post_umount},
63 {.desc = "mounted folder containing file", .flag = MS_REMOUNT | MS_RDONLY,
64 .exp_errno = EBUSY, .setup = pre_create_file, .cleanup = post_delete_file},
65 {.device = &null, .desc = "invalid device", .exp_errno = EINVAL},
66 {.fs_type = &null, .desc = "invalid device type", .exp_errno = EINVAL},
67 {.desc = "mounted folder", .flag = MS_REMOUNT, .exp_errno = EINVAL},
68 {.device = &fault, .desc = "fault device", .exp_errno = EFAULT},
69 {.fs_type = &fault, .desc = "fault device type", .exp_errno = EFAULT},
70 {.mntpoint = &long_path, .desc = "long name", .exp_errno = ENAMETOOLONG},
71 {.mntpoint = &nonexistent, .desc = "non existant folder", .exp_errno = ENOENT},
72 {.device = &device, .mntpoint = &file, .desc = "file", .exp_errno = ENOTDIR},
73 };
74
pre_mount(void)75 static void pre_mount(void)
76 {
77 SAFE_MOUNT(device, mntpoint, fs_type, 0, NULL);
78 }
79
post_umount(void)80 static void post_umount(void)
81 {
82 if (tst_is_mounted(MNTPOINT))
83 SAFE_UMOUNT(MNTPOINT);
84 }
85
pre_create_file(void)86 static void pre_create_file(void)
87 {
88 pre_mount();
89 fd = SAFE_OPEN(TEST_FILE, O_CREAT | O_RDWR, 0700);
90 }
91
post_delete_file(void)92 static void post_delete_file(void)
93 {
94 SAFE_CLOSE(fd);
95 post_umount();
96 }
97
setup(void)98 static void setup(void)
99 {
100 fault = tst_get_bad_addr(NULL);
101
102 device = tst_device->dev;
103 fs_type = tst_device->fs_type;
104
105 memset(path, 'a', PATH_MAX + 1);
106
107 SAFE_MKNOD(char_dev, S_IFCHR | 0777, 0);
108 SAFE_TOUCH(file, 0777, 0);
109 }
110
cleanup(void)111 static void cleanup(void)
112 {
113 if (tst_is_mounted(MNTPOINT))
114 SAFE_UMOUNT(MNTPOINT);
115 }
116
run(unsigned int i)117 static void run(unsigned int i)
118 {
119 struct test_case *tc = &test_cases[i];
120
121 if (!tc->device)
122 tc->device = &device;
123
124 if (!tc->mntpoint)
125 tc->mntpoint = &mntpoint;
126
127 if (!tc->fs_type)
128 tc->fs_type = &fs_type;
129
130 if (tc->setup)
131 tc->setup();
132
133 TST_EXP_FAIL(mount(*tc->device, *tc->mntpoint, *tc->fs_type, tc->flag, NULL),
134 tc->exp_errno,
135 "mounting %s",
136 tc->desc);
137
138 if (tc->cleanup)
139 tc->cleanup();
140 }
141
142 static struct tst_test test = {
143 .tcnt = ARRAY_SIZE(test_cases),
144 .test = run,
145 .setup = setup,
146 .cleanup = cleanup,
147 .needs_root = 1,
148 .format_device = 1,
149 .mntpoint = MNTPOINT,
150 };
151