2 * Copyright (C) 2005, 2012 IBM Corporation
5 * Kent Yoder <key@linux.vnet.ibm.com>
6 * Seiji Munetoh <munetoh@jp.ibm.com>
7 * Stefan Berger <stefanb@us.ibm.com>
8 * Reiner Sailer <sailer@watson.ibm.com>
9 * Kylene Hall <kjhall@us.ibm.com>
10 * Nayna Jain <nayna@linux.vnet.ibm.com>
12 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
14 * Access to the event log created by a system's firmware / BIOS
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
23 #include <linux/seq_file.h>
24 #include <linux/efi.h>
26 #include <linux/security.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/tpm_eventlog.h>
35 static const char* tcpa_event_type_strings[] = {
46 "Platform Config Flags",
56 static const char* tcpa_pc_event_id_strings[] = {
67 "Option ROM microcode ",
74 /* returns pointer to start of pos. entry of tcg log */
75 static void *tpm1_bios_measurements_start(struct seq_file *m, loff_t *pos)
78 struct tpm_chip *chip = m->private;
79 struct tpm_bios_log *log = &chip->log;
80 void *addr = log->bios_event_log;
81 void *limit = log->bios_event_log_end;
82 struct tcpa_event *event;
83 u32 converted_event_size;
84 u32 converted_event_type;
87 /* read over *pos measurements */
88 for (i = 0; i < *pos; i++) {
91 converted_event_size =
92 do_endian_conversion(event->event_size);
93 converted_event_type =
94 do_endian_conversion(event->event_type);
96 if ((addr + sizeof(struct tcpa_event)) < limit) {
97 if ((converted_event_type == 0) &&
98 (converted_event_size == 0))
100 addr += (sizeof(struct tcpa_event) +
101 converted_event_size);
105 /* now check if current entry is valid */
106 if ((addr + sizeof(struct tcpa_event)) >= limit)
111 converted_event_size = do_endian_conversion(event->event_size);
112 converted_event_type = do_endian_conversion(event->event_type);
114 if (((converted_event_type == 0) && (converted_event_size == 0))
115 || ((addr + sizeof(struct tcpa_event) + converted_event_size)
122 static void *tpm1_bios_measurements_next(struct seq_file *m, void *v,
125 struct tcpa_event *event = v;
126 struct tpm_chip *chip = m->private;
127 struct tpm_bios_log *log = &chip->log;
128 void *limit = log->bios_event_log_end;
129 u32 converted_event_size;
130 u32 converted_event_type;
133 converted_event_size = do_endian_conversion(event->event_size);
135 v += sizeof(struct tcpa_event) + converted_event_size;
137 /* now check if current entry is valid */
138 if ((v + sizeof(struct tcpa_event)) >= limit)
143 converted_event_size = do_endian_conversion(event->event_size);
144 converted_event_type = do_endian_conversion(event->event_type);
146 if (((converted_event_type == 0) && (converted_event_size == 0)) ||
147 ((v + sizeof(struct tcpa_event) + converted_event_size) >= limit))
153 static void tpm1_bios_measurements_stop(struct seq_file *m, void *v)
157 static int get_event_name(char *dest, struct tcpa_event *event,
158 unsigned char * event_entry)
160 const char *name = "";
161 /* 41 so there is room for 40 data and 1 nul */
163 int i, n_len = 0, d_len = 0;
164 struct tcpa_pc_event *pc_event;
166 switch (do_endian_conversion(event->event_type)) {
174 case PLATFORM_CONFIG_FLAGS:
175 case TABLE_OF_DEVICES:
178 case IPL_PARTITION_DATA:
182 name = tcpa_event_type_strings[do_endian_conversion
183 (event->event_type)];
184 n_len = strlen(name);
189 do_endian_conversion(event->event_size)) {
191 n_len = do_endian_conversion(event->event_size);
195 pc_event = (struct tcpa_pc_event *)event_entry;
197 /* ToDo Row data -> Base64 */
199 switch (do_endian_conversion(pc_event->event_id)) {
204 case OPTION_ROM_EXEC:
205 case OPTION_ROM_CONFIG:
207 name = tcpa_pc_event_id_strings[do_endian_conversion
208 (pc_event->event_id)];
209 n_len = strlen(name);
214 case OPTION_ROM_MICROCODE:
215 case S_CRTM_CONTENTS:
217 name = tcpa_pc_event_id_strings[do_endian_conversion
218 (pc_event->event_id)];
219 n_len = strlen(name);
220 for (i = 0; i < 20; i++)
221 d_len += sprintf(&data[2*i], "%02x",
222 pc_event->event_data[i]);
231 return snprintf(dest, MAX_TEXT_EVENT, "[%.*s%.*s]",
232 n_len, name, d_len, data);
236 static int tpm1_binary_bios_measurements_show(struct seq_file *m, void *v)
238 struct tcpa_event *event = v;
239 struct tcpa_event temp_event;
243 memcpy(&temp_event, event, sizeof(struct tcpa_event));
245 /* convert raw integers for endianness */
246 temp_event.pcr_index = do_endian_conversion(event->pcr_index);
247 temp_event.event_type = do_endian_conversion(event->event_type);
248 temp_event.event_size = do_endian_conversion(event->event_size);
250 temp_ptr = (char *) &temp_event;
252 for (i = 0; i < (sizeof(struct tcpa_event) - 1) ; i++)
253 seq_putc(m, temp_ptr[i]);
255 temp_ptr = (char *) v;
257 for (i = (sizeof(struct tcpa_event) - 1);
258 i < (sizeof(struct tcpa_event) + temp_event.event_size); i++)
259 seq_putc(m, temp_ptr[i]);
265 static int tpm1_ascii_bios_measurements_show(struct seq_file *m, void *v)
269 struct tcpa_event *event = v;
270 unsigned char *event_entry =
271 (unsigned char *)(v + sizeof(struct tcpa_event));
273 eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL);
275 printk(KERN_ERR "%s: ERROR - No Memory for event name\n ",
281 seq_printf(m, "%2d ", do_endian_conversion(event->pcr_index));
284 seq_printf(m, "%20phN", event->pcr_value);
286 /* 3rd: event type identifier */
287 seq_printf(m, " %02x", do_endian_conversion(event->event_type));
289 len += get_event_name(eventname, event, event_entry);
291 /* 4th: eventname <= max + \'0' delimiter */
292 seq_printf(m, " %s\n", eventname);
298 const struct seq_operations tpm1_ascii_b_measurements_seqops = {
299 .start = tpm1_bios_measurements_start,
300 .next = tpm1_bios_measurements_next,
301 .stop = tpm1_bios_measurements_stop,
302 .show = tpm1_ascii_bios_measurements_show,
305 const struct seq_operations tpm1_binary_b_measurements_seqops = {
306 .start = tpm1_bios_measurements_start,
307 .next = tpm1_bios_measurements_next,
308 .stop = tpm1_bios_measurements_stop,
309 .show = tpm1_binary_bios_measurements_show,