1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
4 * Copyright (c) 2018 Xiao Yang <[email protected]>
5 */
6
7 /*
8 * AUTHOR: Madhu T L <[email protected]>
9 *
10 * DESCRIPTION
11 * Verify that, delete_module(2) returns -1 and sets errno to EWOULDBLOCK,
12 * if tried to remove a module while other modules depend on this module.
13 */
14
15 #include <stdlib.h>
16 #include <errno.h>
17 #include "tst_test.h"
18 #include "tst_module.h"
19 #include "tst_kconfig.h"
20 #include "lapi/syscalls.h"
21
22 #define DUMMY_MOD "dummy_del_mod"
23 #define DUMMY_MOD_KO "dummy_del_mod.ko"
24 #define DUMMY_MOD_DEP_KO "dummy_del_mod_dep.ko"
25
26 static int dummy_mod_loaded;
27 static int dummy_mod_dep_loaded;
28
do_delete_module(void)29 static void do_delete_module(void)
30 {
31 TEST(tst_syscall(__NR_delete_module, DUMMY_MOD, 0));
32 if (TST_RET < 0) {
33 if (TST_ERR == EWOULDBLOCK) {
34 tst_res(TPASS | TTERRNO,
35 "delete_module() failed as expected");
36 } else {
37 tst_res(TFAIL | TTERRNO, "delete_module() failed "
38 "unexpectedly; expected: %s",
39 tst_strerrno(EWOULDBLOCK));
40 }
41 } else {
42 tst_res(TFAIL, "delete_module() succeeded unexpectedly");
43 dummy_mod_loaded = 0;
44 /*
45 * insmod DUMMY_MOD_KO again in case running
46 * with -i option
47 */
48 tst_module_load(DUMMY_MOD_KO, NULL);
49 dummy_mod_loaded = 1;
50 }
51 }
52
setup(void)53 static void setup(void)
54 {
55 struct tst_kcmdline_var params = TST_KCMDLINE_INIT("module.sig_enforce");
56
57 tst_kcmdline_parse(¶ms, 1);
58 if (atoi(params.value) == 1)
59 tst_brk(TCONF, "module signature is enforced, skip test");
60
61 /* Load first kernel module */
62 tst_module_load(DUMMY_MOD_KO, NULL);
63 dummy_mod_loaded = 1;
64
65 /* Load dependant kernel module */
66 tst_module_load(DUMMY_MOD_DEP_KO, NULL);
67 dummy_mod_dep_loaded = 1;
68 }
69
cleanup(void)70 static void cleanup(void)
71 {
72 /* Unload dependent kernel module */
73 if (dummy_mod_dep_loaded == 1)
74 tst_module_unload(DUMMY_MOD_DEP_KO);
75
76 /* Unload first kernel module */
77 if (dummy_mod_loaded == 1)
78 tst_module_unload(DUMMY_MOD_KO);
79 }
80
81 static struct tst_test test = {
82 .needs_root = 1,
83 /* lockdown and SecureBoot requires signed modules */
84 .skip_in_lockdown = 1,
85 .skip_in_secureboot = 1,
86 .setup = setup,
87 .cleanup = cleanup,
88 .test_all = do_delete_module,
89 };
90