1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2005, 2012 IBM Corporation
6 * Kent Yoder <key@linux.vnet.ibm.com>
7 * Seiji Munetoh <munetoh@jp.ibm.com>
8 * Stefan Berger <stefanb@us.ibm.com>
9 * Reiner Sailer <sailer@watson.ibm.com>
10 * Kylene Hall <kjhall@us.ibm.com>
11 * Nayna Jain <nayna@linux.vnet.ibm.com>
13 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
15 * Access to the event log created by a system's firmware / BIOS
18 #include <linux/seq_file.h>
19 #include <linux/efi.h>
21 #include <linux/security.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
24 #include <linux/tpm_eventlog.h>
30 static const char* tcpa_event_type_strings[] = {
41 "Platform Config Flags",
51 static const char* tcpa_pc_event_id_strings[] = {
62 "Option ROM microcode ",
69 /* returns pointer to start of pos. entry of tcg log */
70 static void *tpm1_bios_measurements_start(struct seq_file *m, loff_t *pos)
73 struct tpm_chip *chip = m->private;
74 struct tpm_bios_log *log = &chip->log;
75 void *addr = log->bios_event_log;
76 void *limit = log->bios_event_log_end;
77 struct tcpa_event *event;
78 u32 converted_event_size;
79 u32 converted_event_type;
81 /* read over *pos measurements */
85 /* check if current entry is valid */
86 if (addr + sizeof(struct tcpa_event) > limit)
89 converted_event_size =
90 do_endian_conversion(event->event_size);
91 converted_event_type =
92 do_endian_conversion(event->event_type);
94 if (((converted_event_type == 0) && (converted_event_size == 0))
95 || ((addr + sizeof(struct tcpa_event) + converted_event_size)
102 addr += (sizeof(struct tcpa_event) + converted_event_size);
108 static void *tpm1_bios_measurements_next(struct seq_file *m, void *v,
111 struct tcpa_event *event = v;
112 struct tpm_chip *chip = m->private;
113 struct tpm_bios_log *log = &chip->log;
114 void *limit = log->bios_event_log_end;
115 u32 converted_event_size;
116 u32 converted_event_type;
119 converted_event_size = do_endian_conversion(event->event_size);
121 v += sizeof(struct tcpa_event) + converted_event_size;
123 /* now check if current entry is valid */
124 if ((v + sizeof(struct tcpa_event)) > limit)
129 converted_event_size = do_endian_conversion(event->event_size);
130 converted_event_type = do_endian_conversion(event->event_type);
132 if (((converted_event_type == 0) && (converted_event_size == 0)) ||
133 ((v + sizeof(struct tcpa_event) + converted_event_size) > limit))
139 static void tpm1_bios_measurements_stop(struct seq_file *m, void *v)
143 static int get_event_name(char *dest, struct tcpa_event *event,
144 unsigned char * event_entry)
146 const char *name = "";
147 /* 41 so there is room for 40 data and 1 nul */
149 int i, n_len = 0, d_len = 0;
150 struct tcpa_pc_event *pc_event;
152 switch (do_endian_conversion(event->event_type)) {
160 case PLATFORM_CONFIG_FLAGS:
161 case TABLE_OF_DEVICES:
164 case IPL_PARTITION_DATA:
168 name = tcpa_event_type_strings[do_endian_conversion
169 (event->event_type)];
170 n_len = strlen(name);
175 do_endian_conversion(event->event_size)) {
177 n_len = do_endian_conversion(event->event_size);
181 pc_event = (struct tcpa_pc_event *)event_entry;
183 /* ToDo Row data -> Base64 */
185 switch (do_endian_conversion(pc_event->event_id)) {
190 case OPTION_ROM_EXEC:
191 case OPTION_ROM_CONFIG:
193 name = tcpa_pc_event_id_strings[do_endian_conversion
194 (pc_event->event_id)];
195 n_len = strlen(name);
200 case OPTION_ROM_MICROCODE:
201 case S_CRTM_CONTENTS:
203 name = tcpa_pc_event_id_strings[do_endian_conversion
204 (pc_event->event_id)];
205 n_len = strlen(name);
206 for (i = 0; i < 20; i++)
207 d_len += sprintf(&data[2*i], "%02x",
208 pc_event->event_data[i]);
218 return snprintf(dest, MAX_TEXT_EVENT, "[%.*s%.*s]",
219 n_len, name, d_len, data);
223 static int tpm1_binary_bios_measurements_show(struct seq_file *m, void *v)
225 struct tcpa_event *event = v;
226 struct tcpa_event temp_event;
230 memcpy(&temp_event, event, sizeof(struct tcpa_event));
232 /* convert raw integers for endianness */
233 temp_event.pcr_index = do_endian_conversion(event->pcr_index);
234 temp_event.event_type = do_endian_conversion(event->event_type);
235 temp_event.event_size = do_endian_conversion(event->event_size);
237 temp_ptr = (char *) &temp_event;
239 for (i = 0; i < (sizeof(struct tcpa_event) - 1) ; i++)
240 seq_putc(m, temp_ptr[i]);
242 temp_ptr = (char *) v;
244 for (i = (sizeof(struct tcpa_event) - 1);
245 i < (sizeof(struct tcpa_event) + temp_event.event_size); i++)
246 seq_putc(m, temp_ptr[i]);
252 static int tpm1_ascii_bios_measurements_show(struct seq_file *m, void *v)
256 struct tcpa_event *event = v;
257 unsigned char *event_entry =
258 (unsigned char *)(v + sizeof(struct tcpa_event));
260 eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL);
262 printk(KERN_ERR "%s: ERROR - No Memory for event name\n ",
268 seq_printf(m, "%2d ", do_endian_conversion(event->pcr_index));
271 seq_printf(m, "%20phN", event->pcr_value);
273 /* 3rd: event type identifier */
274 seq_printf(m, " %02x", do_endian_conversion(event->event_type));
276 len += get_event_name(eventname, event, event_entry);
278 /* 4th: eventname <= max + \'0' delimiter */
279 seq_printf(m, " %s\n", eventname);
285 const struct seq_operations tpm1_ascii_b_measurements_seqops = {
286 .start = tpm1_bios_measurements_start,
287 .next = tpm1_bios_measurements_next,
288 .stop = tpm1_bios_measurements_stop,
289 .show = tpm1_ascii_bios_measurements_show,
292 const struct seq_operations tpm1_binary_b_measurements_seqops = {
293 .start = tpm1_bios_measurements_start,
294 .next = tpm1_bios_measurements_next,
295 .stop = tpm1_bios_measurements_stop,
296 .show = tpm1_binary_bios_measurements_show,