1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2020 Viresh Kumar <viresh.kumar@linaro.org>
4 */
5
6 /*\
7 * [Description]
8 *
9 * Basic finit_module() failure tests.
10 *
11 * [Algorithm]
12 *
13 * Tests various failure scenarios for finit_module().
14 */
15
16 #include <linux/capability.h>
17 #include <errno.h>
18 #include "lapi/init_module.h"
19 #include "tst_module.h"
20 #include "tst_capability.h"
21
22 #define MODULE_NAME "finit_module.ko"
23 #define TEST_DIR "test_dir"
24
25 static char *mod_path;
26
27 static int fd, fd_zero, fd_invalid = -1, fd_dir;
28
29 static struct tst_cap cap_req = TST_CAP(TST_CAP_REQ, CAP_SYS_MODULE);
30 static struct tst_cap cap_drop = TST_CAP(TST_CAP_DROP, CAP_SYS_MODULE);
31
32 struct tcase {
33 const char *name;
34 int *fd;
35 const char *param;
36 int open_flags;
37 int flags;
38 int cap;
39 int exp_errno;
40 void (*fix_errno)(struct tcase *tc);
41 };
42
bad_fd_setup(struct tcase * tc)43 static void bad_fd_setup(struct tcase *tc)
44 {
45 if (tst_kvercmp(4, 6, 0) < 0)
46 tc->exp_errno = ENOEXEC;
47 else
48 tc->exp_errno = EBADF;
49 }
50
wo_file_setup(struct tcase * tc)51 static void wo_file_setup(struct tcase *tc)
52 {
53 if (tst_kvercmp(4, 6, 0) < 0)
54 tc->exp_errno = EBADF;
55 else
56 tc->exp_errno = ETXTBSY;
57 }
58
dir_setup(struct tcase * tc)59 static void dir_setup(struct tcase *tc)
60 {
61 if (tst_kvercmp(4, 6, 0) < 0)
62 tc->exp_errno = EISDIR;
63 else
64 tc->exp_errno = EINVAL;
65 }
66
67 static struct tcase tcases[] = {
68 {"invalid-fd", &fd_invalid, "", O_RDONLY | O_CLOEXEC, 0, 0, 0, bad_fd_setup},
69 {"zero-fd", &fd_zero, "", O_RDONLY | O_CLOEXEC, 0, 0, EINVAL, NULL},
70 {"null-param", &fd, NULL, O_RDONLY | O_CLOEXEC, 0, 0, EFAULT, NULL},
71 {"invalid-param", &fd, "status=invalid", O_RDONLY | O_CLOEXEC, 0, 0, EINVAL, NULL},
72 {"invalid-flags", &fd, "", O_RDONLY | O_CLOEXEC, -1, 0, EINVAL, NULL},
73 {"no-perm", &fd, "", O_RDONLY | O_CLOEXEC, 0, 1, EPERM, NULL},
74 {"module-exists", &fd, "", O_RDONLY | O_CLOEXEC, 0, 0, EEXIST, NULL},
75 {"file-not-readable", &fd, "", O_WRONLY | O_CLOEXEC, 0, 0, 0, wo_file_setup},
76 {"directory", &fd_dir, "", O_RDONLY | O_CLOEXEC, 0, 0, 0, dir_setup},
77 };
78
setup(void)79 static void setup(void)
80 {
81 unsigned long int i;
82
83 finit_module_supported_by_kernel();
84
85 tst_module_exists(MODULE_NAME, &mod_path);
86
87 SAFE_MKDIR(TEST_DIR, 0700);
88 fd_dir = SAFE_OPEN(TEST_DIR, O_DIRECTORY);
89
90 for (i = 0; i < ARRAY_SIZE(tcases); i++) {
91 if (tcases[i].fix_errno)
92 tcases[i].fix_errno(&tcases[i]);
93 }
94 }
95
cleanup(void)96 static void cleanup(void)
97 {
98 SAFE_CLOSE(fd_dir);
99 }
100
run(unsigned int n)101 static void run(unsigned int n)
102 {
103 struct tcase *tc = &tcases[n];
104
105 fd = SAFE_OPEN(mod_path, tc->open_flags);
106
107 if (tc->cap)
108 tst_cap_action(&cap_drop);
109
110 /* Insert module twice */
111 if (tc->exp_errno == EEXIST)
112 tst_module_load(MODULE_NAME, NULL);
113
114 TST_EXP_FAIL(finit_module(*tc->fd, tc->param, tc->flags), tc->exp_errno,
115 "TestName: %s", tc->name);
116
117 if (tc->exp_errno == EEXIST)
118 tst_module_unload(MODULE_NAME);
119
120 if (!TST_PASS && !TST_RET)
121 tst_module_unload(MODULE_NAME);
122
123 if (tc->cap)
124 tst_cap_action(&cap_req);
125
126 SAFE_CLOSE(fd);
127 }
128
129 static struct tst_test test = {
130 .test = run,
131 .tcnt = ARRAY_SIZE(tcases),
132 .setup = setup,
133 .cleanup = cleanup,
134 .needs_tmpdir = 1,
135 .needs_root = 1,
136 };
137