1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017 Google, Inc.
4 * Thiebaud Weksteen <tweek@google.com>
5 */
6
7 #define TPM_MEMREMAP(start, size) early_memremap(start, size)
8 #define TPM_MEMUNMAP(start, size) early_memunmap(start, size)
9
10 #include <asm/early_ioremap.h>
11 #include <linux/efi.h>
12 #include <linux/init.h>
13 #include <linux/memblock.h>
14 #include <linux/tpm_eventlog.h>
15
16 int efi_tpm_final_log_size;
17 EXPORT_SYMBOL(efi_tpm_final_log_size);
18
tpm2_calc_event_log_size(void * data,int count,void * size_info)19 static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info)
20 {
21 struct tcg_pcr_event2_head *header;
22 int event_size, size = 0;
23
24 while (count > 0) {
25 header = data + size;
26 event_size = __calc_tpm2_event_size(header, size_info, true);
27 if (event_size == 0)
28 return -1;
29 size += event_size;
30 count--;
31 }
32
33 return size;
34 }
35
36 /*
37 * Reserve the memory associated with the TPM Event Log configuration table.
38 */
efi_tpm_eventlog_init(void)39 int __init efi_tpm_eventlog_init(void)
40 {
41 struct linux_efi_tpm_eventlog *log_tbl;
42 struct efi_tcg2_final_events_table *final_tbl;
43 unsigned int tbl_size;
44 int final_tbl_size;
45 int ret = 0;
46
47 if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
48 /*
49 * We can't calculate the size of the final events without the
50 * first entry in the TPM log, so bail here.
51 */
52 return 0;
53 }
54
55 log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl));
56 if (!log_tbl) {
57 pr_err("Failed to map TPM Event Log table @ 0x%lx\n",
58 efi.tpm_log);
59 efi.tpm_log = EFI_INVALID_TABLE_ADDR;
60 return -ENOMEM;
61 }
62
63 tbl_size = sizeof(*log_tbl) + log_tbl->size;
64 memblock_reserve(efi.tpm_log, tbl_size);
65
66 if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR) {
67 pr_info("TPM Final Events table not present\n");
68 goto out;
69 } else if (log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
70 pr_warn(FW_BUG "TPM Final Events table invalid\n");
71 goto out;
72 }
73
74 final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl));
75
76 if (!final_tbl) {
77 pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n",
78 efi.tpm_final_log);
79 efi.tpm_final_log = EFI_INVALID_TABLE_ADDR;
80 ret = -ENOMEM;
81 goto out;
82 }
83
84 final_tbl_size = 0;
85 if (final_tbl->nr_events != 0) {
86 void *events = (void *)efi.tpm_final_log
87 + sizeof(final_tbl->version)
88 + sizeof(final_tbl->nr_events);
89
90 final_tbl_size = tpm2_calc_event_log_size(events,
91 final_tbl->nr_events,
92 log_tbl->log);
93 }
94
95 if (final_tbl_size < 0) {
96 pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n");
97 ret = -EINVAL;
98 goto out_calc;
99 }
100
101 memblock_reserve(efi.tpm_final_log,
102 final_tbl_size + sizeof(*final_tbl));
103 efi_tpm_final_log_size = final_tbl_size;
104
105 out_calc:
106 early_memunmap(final_tbl, sizeof(*final_tbl));
107 out:
108 early_memunmap(log_tbl, sizeof(*log_tbl));
109 return ret;
110 }
111
112