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path: root/drivers/char/tpm/tpm_bios.c
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Diffstat (limited to 'drivers/char/tpm/tpm_bios.c')
-rw-r--r--drivers/char/tpm/tpm_bios.c137
1 files changed, 67 insertions, 70 deletions
diff --git a/drivers/char/tpm/tpm_bios.c b/drivers/char/tpm/tpm_bios.c
index 537aa45d8c67..a611972024e6 100644
--- a/drivers/char/tpm/tpm_bios.c
+++ b/drivers/char/tpm/tpm_bios.c
@@ -29,6 +29,11 @@
#define MAX_TEXT_EVENT 1000 /* Max event string length */
#define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
+enum bios_platform_class {
+ BIOS_CLIENT = 0x00,
+ BIOS_SERVER = 0x01,
+};
+
struct tpm_bios_log {
void *bios_event_log;
void *bios_event_log_end;
@@ -36,9 +41,18 @@ struct tpm_bios_log {
struct acpi_tcpa {
struct acpi_table_header hdr;
- u16 reserved;
- u32 log_max_len __attribute__ ((packed));
- u32 log_start_addr __attribute__ ((packed));
+ u16 platform_class;
+ union {
+ struct client_hdr {
+ u32 log_max_len __attribute__ ((packed));
+ u64 log_start_addr __attribute__ ((packed));
+ } client;
+ struct server_hdr {
+ u16 reserved;
+ u64 log_max_len __attribute__ ((packed));
+ u64 log_start_addr __attribute__ ((packed));
+ } server;
+ };
};
struct tcpa_event {
@@ -91,6 +105,12 @@ static const char* tcpa_event_type_strings[] = {
"Non-Host Info"
};
+struct tcpa_pc_event {
+ u32 event_id;
+ u32 event_size;
+ u8 event_data[0];
+};
+
enum tcpa_pc_event_ids {
SMBIOS = 1,
BIS_CERT,
@@ -100,14 +120,15 @@ enum tcpa_pc_event_ids {
NVRAM,
OPTION_ROM_EXEC,
OPTION_ROM_CONFIG,
- OPTION_ROM_MICROCODE,
+ OPTION_ROM_MICROCODE = 10,
S_CRTM_VERSION,
S_CRTM_CONTENTS,
POST_CONTENTS,
+ HOST_TABLE_OF_DEVICES,
};
static const char* tcpa_pc_event_id_strings[] = {
- ""
+ "",
"SMBIOS",
"BIS Certificate",
"POST BIOS ",
@@ -116,10 +137,12 @@ static const char* tcpa_pc_event_id_strings[] = {
"NVRAM",
"Option ROM",
"Option ROM config",
- "Option ROM microcode",
+ "",
+ "Option ROM microcode ",
"S-CRTM Version",
- "S-CRTM Contents",
- "S-CRTM POST Contents",
+ "S-CRTM Contents ",
+ "POST Contents ",
+ "Table of Devices",
};
/* returns pointer to start of pos. entry of tcg log */
@@ -191,7 +214,7 @@ static int get_event_name(char *dest, struct tcpa_event *event,
const char *name = "";
char data[40] = "";
int i, n_len = 0, d_len = 0;
- u32 event_id;
+ struct tcpa_pc_event *pc_event;
switch(event->event_type) {
case PREBOOT:
@@ -220,31 +243,32 @@ static int get_event_name(char *dest, struct tcpa_event *event,
}
break;
case EVENT_TAG:
- event_id = be32_to_cpu(*((u32 *)event_entry));
+ pc_event = (struct tcpa_pc_event *)event_entry;
/* ToDo Row data -> Base64 */
- switch (event_id) {
+ switch (pc_event->event_id) {
case SMBIOS:
case BIS_CERT:
case CMOS:
case NVRAM:
case OPTION_ROM_EXEC:
case OPTION_ROM_CONFIG:
- case OPTION_ROM_MICROCODE:
case S_CRTM_VERSION:
- case S_CRTM_CONTENTS:
- case POST_CONTENTS:
- name = tcpa_pc_event_id_strings[event_id];
+ name = tcpa_pc_event_id_strings[pc_event->event_id];
n_len = strlen(name);
break;
+ /* hash data */
case POST_BIOS_ROM:
case ESCD:
- name = tcpa_pc_event_id_strings[event_id];
+ case OPTION_ROM_MICROCODE:
+ case S_CRTM_CONTENTS:
+ case POST_CONTENTS:
+ name = tcpa_pc_event_id_strings[pc_event->event_id];
n_len = strlen(name);
for (i = 0; i < 20; i++)
- d_len += sprintf(data, "%02x",
- event_entry[8 + i]);
+ d_len += sprintf(&data[2*i], "%02x",
+ pc_event->event_data[i]);
break;
default:
break;
@@ -260,52 +284,13 @@ static int get_event_name(char *dest, struct tcpa_event *event,
static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v)
{
+ struct tcpa_event *event = v;
+ char *data = v;
+ int i;
- char *eventname;
- char data[4];
- u32 help;
- int i, len;
- struct tcpa_event *event = (struct tcpa_event *) v;
- unsigned char *event_entry =
- (unsigned char *) (v + sizeof(struct tcpa_event));
-
- eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL);
- if (!eventname) {
- printk(KERN_ERR "%s: ERROR - No Memory for event name\n ",
- __func__);
- return -ENOMEM;
- }
-
- /* 1st: PCR used is in little-endian format (4 bytes) */
- help = le32_to_cpu(event->pcr_index);
- memcpy(data, &help, 4);
- for (i = 0; i < 4; i++)
- seq_putc(m, data[i]);
-
- /* 2nd: SHA1 (20 bytes) */
- for (i = 0; i < 20; i++)
- seq_putc(m, event->pcr_value[i]);
-
- /* 3rd: event type identifier (4 bytes) */
- help = le32_to_cpu(event->event_type);
- memcpy(data, &help, 4);
- for (i = 0; i < 4; i++)
+ for (i = 0; i < sizeof(struct tcpa_event) + event->event_size; i++)
seq_putc(m, data[i]);
- len = 0;
-
- len += get_event_name(eventname, event, event_entry);
-
- /* 4th: filename <= 255 + \'0' delimiter */
- if (len > TCG_EVENT_NAME_LEN_MAX)
- len = TCG_EVENT_NAME_LEN_MAX;
-
- for (i = 0; i < len; i++)
- seq_putc(m, eventname[i]);
-
- /* 5th: delimiter */
- seq_putc(m, '\0');
-
return 0;
}
@@ -353,6 +338,7 @@ static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
/* 4th: eventname <= max + \'0' delimiter */
seq_printf(m, " %s\n", eventname);
+ kfree(eventname);
return 0;
}
@@ -376,6 +362,7 @@ static int read_log(struct tpm_bios_log *log)
struct acpi_tcpa *buff;
acpi_status status;
struct acpi_table_header *virt;
+ u64 len, start;
if (log->bios_event_log != NULL) {
printk(KERN_ERR
@@ -396,27 +383,37 @@ static int read_log(struct tpm_bios_log *log)
return -EIO;
}
- if (buff->log_max_len == 0) {
+ switch(buff->platform_class) {
+ case BIOS_SERVER:
+ len = buff->server.log_max_len;
+ start = buff->server.log_start_addr;
+ break;
+ case BIOS_CLIENT:
+ default:
+ len = buff->client.log_max_len;
+ start = buff->client.log_start_addr;
+ break;
+ }
+ if (!len) {
printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__);
return -EIO;
}
/* malloc EventLog space */
- log->bios_event_log = kmalloc(buff->log_max_len, GFP_KERNEL);
+ log->bios_event_log = kmalloc(len, GFP_KERNEL);
if (!log->bios_event_log) {
- printk
- ("%s: ERROR - Not enough Memory for BIOS measurements\n",
- __func__);
+ printk("%s: ERROR - Not enough Memory for BIOS measurements\n",
+ __func__);
return -ENOMEM;
}
- log->bios_event_log_end = log->bios_event_log + buff->log_max_len;
+ log->bios_event_log_end = log->bios_event_log + len;
- acpi_os_map_memory(buff->log_start_addr, buff->log_max_len, (void *) &virt);
+ acpi_os_map_memory(start, len, (void *) &virt);
- memcpy(log->bios_event_log, virt, buff->log_max_len);
+ memcpy(log->bios_event_log, virt, len);
- acpi_os_unmap_memory(virt, buff->log_max_len);
+ acpi_os_unmap_memory(virt, len);
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.