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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/firmware/efi/libstub/tpm.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
23  * TPM handling.
34  *
....@@ -5,9 +6,6 @@
56  * Copyright (C) 2017 Google, Inc.
67  *     Matthew Garrett <mjg59@google.com>
78  *     Thiebaud Weksteen <tweek@google.com>
8
- *
9
- * This file is part of the Linux kernel, and is made available under the
10
- * terms of the GNU General Public License version 2.
119  */
1210 #include <linux/efi.h>
1311 #include <linux/tpm_eventlog.h>
....@@ -22,23 +20,13 @@
2220 #define MEMORY_ONLY_RESET_CONTROL_GUID \
2321 	EFI_GUID(0xe20939be, 0x32d4, 0x41be, 0xa1, 0x50, 0x89, 0x7f, 0x85, 0xd4, 0x98, 0x29)
2422 
25
-#define get_efi_var(name, vendor, ...) \
26
-	efi_call_runtime(get_variable, \
27
-			 (efi_char16_t *)(name), (efi_guid_t *)(vendor), \
28
-			 __VA_ARGS__)
29
-
30
-#define set_efi_var(name, vendor, ...) \
31
-	efi_call_runtime(set_variable, \
32
-			 (efi_char16_t *)(name), (efi_guid_t *)(vendor), \
33
-			 __VA_ARGS__)
34
-
3523 /*
3624  * Enable reboot attack mitigation. This requests that the firmware clear the
3725  * RAM on next reboot before proceeding with boot, ensuring that any secrets
3826  * are cleared. If userland has ensured that all secrets have been removed
3927  * from RAM before reboot it can simply reset this variable.
4028  */
41
-void efi_enable_reset_attack_mitigation(efi_system_table_t *sys_table_arg)
29
+void efi_enable_reset_attack_mitigation(void)
4230 {
4331 	u8 val = 1;
4432 	efi_guid_t var_guid = MEMORY_ONLY_RESET_CONTROL_GUID;
....@@ -59,31 +47,39 @@
5947 
6048 #endif
6149 
62
-static void efi_retrieve_tpm2_eventlog_1_2(efi_system_table_t *sys_table_arg)
50
+void efi_retrieve_tpm2_eventlog(void)
6351 {
6452 	efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID;
6553 	efi_guid_t linux_eventlog_guid = LINUX_EFI_TPM_EVENT_LOG_GUID;
6654 	efi_status_t status;
6755 	efi_physical_addr_t log_location = 0, log_last_entry = 0;
6856 	struct linux_efi_tpm_eventlog *log_tbl = NULL;
57
+	struct efi_tcg2_final_events_table *final_events_table = NULL;
6958 	unsigned long first_entry_addr, last_entry_addr;
7059 	size_t log_size, last_entry_size;
7160 	efi_bool_t truncated;
72
-	void *tcg2_protocol = NULL;
61
+	int version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
62
+	efi_tcg2_protocol_t *tcg2_protocol = NULL;
63
+	int final_events_size = 0;
7364 
74
-	status = efi_call_early(locate_protocol, &tcg2_guid, NULL,
75
-				&tcg2_protocol);
65
+	status = efi_bs_call(locate_protocol, &tcg2_guid, NULL,
66
+			     (void **)&tcg2_protocol);
7667 	if (status != EFI_SUCCESS)
7768 		return;
7869 
79
-	status = efi_call_proto(efi_tcg2_protocol, get_event_log, tcg2_protocol,
80
-				EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2,
70
+	status = efi_call_proto(tcg2_protocol, get_event_log, version,
8171 				&log_location, &log_last_entry, &truncated);
82
-	if (status != EFI_SUCCESS)
83
-		return;
8472 
85
-	if (!log_location)
86
-		return;
73
+	if (status != EFI_SUCCESS || !log_location) {
74
+		version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
75
+		status = efi_call_proto(tcg2_protocol, get_event_log, version,
76
+					&log_location, &log_last_entry,
77
+					&truncated);
78
+		if (status != EFI_SUCCESS || !log_location)
79
+			return;
80
+
81
+	}
82
+
8783 	first_entry_addr = (unsigned long) log_location;
8884 
8985 	/*
....@@ -98,39 +94,74 @@
9894 		 * We need to calculate its size to deduce the full size of
9995 		 * the logs.
10096 		 */
101
-		last_entry_size = sizeof(struct tcpa_event) +
102
-			((struct tcpa_event *) last_entry_addr)->event_size;
97
+		if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
98
+			/*
99
+			 * The TCG2 log format has variable length entries,
100
+			 * and the information to decode the hash algorithms
101
+			 * back into a size is contained in the first entry -
102
+			 * pass a pointer to the final entry (to calculate its
103
+			 * size) and the first entry (so we know how long each
104
+			 * digest is)
105
+			 */
106
+			last_entry_size =
107
+				__calc_tpm2_event_size((void *)last_entry_addr,
108
+						    (void *)(long)log_location,
109
+						    false);
110
+		} else {
111
+			last_entry_size = sizeof(struct tcpa_event) +
112
+			   ((struct tcpa_event *) last_entry_addr)->event_size;
113
+		}
103114 		log_size = log_last_entry - log_location + last_entry_size;
104115 	}
105116 
106117 	/* Allocate space for the logs and copy them. */
107
-	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
108
-				sizeof(*log_tbl) + log_size,
109
-				(void **) &log_tbl);
118
+	status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
119
+			     sizeof(*log_tbl) + log_size, (void **)&log_tbl);
110120 
111121 	if (status != EFI_SUCCESS) {
112
-		efi_printk(sys_table_arg,
113
-			   "Unable to allocate memory for event log\n");
122
+		efi_err("Unable to allocate memory for event log\n");
114123 		return;
124
+	}
125
+
126
+	/*
127
+	 * Figure out whether any events have already been logged to the
128
+	 * final events structure, and if so how much space they take up
129
+	 */
130
+	if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
131
+		final_events_table = get_efi_config_table(LINUX_EFI_TPM_FINAL_LOG_GUID);
132
+	if (final_events_table && final_events_table->nr_events) {
133
+		struct tcg_pcr_event2_head *header;
134
+		int offset;
135
+		void *data;
136
+		int event_size;
137
+		int i = final_events_table->nr_events;
138
+
139
+		data = (void *)final_events_table;
140
+		offset = sizeof(final_events_table->version) +
141
+			sizeof(final_events_table->nr_events);
142
+
143
+		while (i > 0) {
144
+			header = data + offset + final_events_size;
145
+			event_size = __calc_tpm2_event_size(header,
146
+						   (void *)(long)log_location,
147
+						   false);
148
+			final_events_size += event_size;
149
+			i--;
150
+		}
115151 	}
116152 
117153 	memset(log_tbl, 0, sizeof(*log_tbl) + log_size);
118154 	log_tbl->size = log_size;
119
-	log_tbl->version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
155
+	log_tbl->final_events_preboot_size = final_events_size;
156
+	log_tbl->version = version;
120157 	memcpy(log_tbl->log, (void *) first_entry_addr, log_size);
121158 
122
-	status = efi_call_early(install_configuration_table,
123
-				&linux_eventlog_guid, log_tbl);
159
+	status = efi_bs_call(install_configuration_table,
160
+			     &linux_eventlog_guid, log_tbl);
124161 	if (status != EFI_SUCCESS)
125162 		goto err_free;
126163 	return;
127164 
128165 err_free:
129
-	efi_call_early(free_pool, log_tbl);
130
-}
131
-
132
-void efi_retrieve_tpm2_eventlog(efi_system_table_t *sys_table_arg)
133
-{
134
-	/* Only try to retrieve the logs in 1.2 format. */
135
-	efi_retrieve_tpm2_eventlog_1_2(sys_table_arg);
166
+	efi_bs_call(free_pool, log_tbl);
136167 }