1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Copyright (C) 2019 IBM Corporation
4 * Author: Nayna Jain
5 */
6
7 #include <linux/ima.h>
8 #include <asm/secure_boot.h>
9
10 bool arch_ima_get_secureboot(void)
11 {
12 return is_ppc_secureboot_enabled();
13 }
14
15 /*
16 * The "secure_rules" are enabled only on "sec
17 * These rules verify the file signatures agai
18 * The "appraise_type=imasig|modsig" option al
19 * to be stored as an xattr or as an appended
20 *
21 * To avoid duplicate signature verification a
22 * policy rule for module appraisal is added o
23 * is not enabled.
24 */
25 static const char *const secure_rules[] = {
26 "appraise func=KEXEC_KERNEL_CHECK appr
27 #ifndef CONFIG_MODULE_SIG
28 "appraise func=MODULE_CHECK appraise_t
29 #endif
30 NULL
31 };
32
33 /*
34 * The "trusted_rules" are enabled only on "tr
35 * These rules add the kexec kernel image and
36 * the IMA measurement list.
37 */
38 static const char *const trusted_rules[] = {
39 "measure func=KEXEC_KERNEL_CHECK",
40 "measure func=MODULE_CHECK",
41 NULL
42 };
43
44 /*
45 * The "secure_and_trusted_rules" contains rul
46 * trusted boot. The "template=ima-modsig" opt
47 * signature, when available, in the IMA measu
48 */
49 static const char *const secure_and_trusted_ru
50 "measure func=KEXEC_KERNEL_CHECK templ
51 "measure func=MODULE_CHECK template=im
52 "appraise func=KEXEC_KERNEL_CHECK appr
53 #ifndef CONFIG_MODULE_SIG
54 "appraise func=MODULE_CHECK appraise_t
55 #endif
56 NULL
57 };
58
59 /*
60 * Returns the relevant IMA arch-specific poli
61 * boot state.
62 */
63 const char *const *arch_get_ima_policy(void)
64 {
65 if (is_ppc_secureboot_enabled()) {
66 if (IS_ENABLED(CONFIG_MODULE_S
67 set_module_sig_enforce
68
69 if (is_ppc_trustedboot_enabled
70 return secure_and_trus
71 else
72 return secure_rules;
73 } else if (is_ppc_trustedboot_enabled(
74 return trusted_rules;
75 }
76
77 return NULL;
78 }
79
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.