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 init_module() failure tests.
10 *
11 * [Algorithm]
12 *
13 * Tests various failure scenarios for init_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 "init_module.ko"
23
24 static unsigned long size, zero_size;
25 static int kernel_lockdown, secure_boot;
26 static void *buf, *faulty_buf, *null_buf;
27
28 static struct tst_cap cap_req = TST_CAP(TST_CAP_REQ, CAP_SYS_MODULE);
29 static struct tst_cap cap_drop = TST_CAP(TST_CAP_DROP, CAP_SYS_MODULE);
30
31 static struct tcase {
32 const char *name;
33 void **buf;
34 unsigned long *size;
35 const char *param;
36 int cap;
37 int skip_in_lockdown;
38 int exp_errno;
39 } tcases[] = {
40 {"NULL-buffer", &null_buf, &size, "", 0, 0, EFAULT},
41 {"faulty-buffer", &faulty_buf, &size, "", 0, 0, EFAULT},
42 {"null-param", &buf, &size, NULL, 0, 1, EFAULT},
43 {"zero-size", &buf, &zero_size, "", 0, 0, ENOEXEC},
44 {"invalid_param", &buf, &size, "status=invalid", 0, 1, EINVAL},
45 {"no-perm", &buf, &size, "", 1, 0, EPERM},
46 {"module-exists", &buf, &size, "", 0, 1, EEXIST},
47 };
48
setup(void)49 static void setup(void)
50 {
51 struct stat sb;
52 int fd;
53
54 tst_module_exists(MODULE_NAME, NULL);
55
56 kernel_lockdown = tst_lockdown_enabled() > 0;
57 secure_boot = tst_secureboot_enabled() > 0;
58 fd = SAFE_OPEN(MODULE_NAME, O_RDONLY|O_CLOEXEC);
59 SAFE_FSTAT(fd, &sb);
60 size = sb.st_size;
61 buf = SAFE_MMAP(0, size, PROT_READ|PROT_EXEC, MAP_PRIVATE, fd, 0);
62 SAFE_CLOSE(fd);
63
64 faulty_buf = tst_get_bad_addr(NULL);
65 }
66
run(unsigned int n)67 static void run(unsigned int n)
68 {
69 struct tcase *tc = &tcases[n];
70
71 if (tc->skip_in_lockdown && (kernel_lockdown || secure_boot)) {
72 tst_res(TCONF, "Cannot load unsigned modules, skipping %s", tc->name);
73 return;
74 }
75
76 if (tc->cap)
77 tst_cap_action(&cap_drop);
78
79 /* Insert module twice */
80 if (tc->exp_errno == EEXIST)
81 tst_module_load(MODULE_NAME, NULL);
82
83 TST_EXP_FAIL(init_module(*tc->buf, *tc->size, tc->param),
84 tc->exp_errno, "TestName: %s", tc->name);
85
86 if (tc->exp_errno == EEXIST)
87 tst_module_unload(MODULE_NAME);
88
89 if (!TST_PASS && !TST_RET)
90 tst_module_unload(MODULE_NAME);
91
92 if (tc->cap)
93 tst_cap_action(&cap_req);
94 }
95
cleanup(void)96 static void cleanup(void)
97 {
98 munmap(buf, size);
99 }
100
101 static struct tst_test test = {
102 .test = run,
103 .tcnt = ARRAY_SIZE(tcases),
104 .setup = setup,
105 .cleanup = cleanup,
106 .needs_root = 1,
107 };
108