mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 01:41:39 +00:00
![Andy Shevchenko](/assets/img/avatar_default.png)
Instead of looping by ourselves we may use %*phN specifier to dump a small buffer. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [ PHuewe: removed now unused variable i ] Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
414 lines
8.8 KiB
C
414 lines
8.8 KiB
C
/*
|
|
* Copyright (C) 2005, 2012 IBM Corporation
|
|
*
|
|
* Authors:
|
|
* Kent Yoder <key@linux.vnet.ibm.com>
|
|
* Seiji Munetoh <munetoh@jp.ibm.com>
|
|
* Stefan Berger <stefanb@us.ibm.com>
|
|
* Reiner Sailer <sailer@watson.ibm.com>
|
|
* Kylene Hall <kjhall@us.ibm.com>
|
|
*
|
|
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
|
|
*
|
|
* Access to the eventlog created by a system's firmware / BIOS
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/seq_file.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/security.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "tpm.h"
|
|
#include "tpm_eventlog.h"
|
|
|
|
|
|
static const char* tcpa_event_type_strings[] = {
|
|
"PREBOOT",
|
|
"POST CODE",
|
|
"",
|
|
"NO ACTION",
|
|
"SEPARATOR",
|
|
"ACTION",
|
|
"EVENT TAG",
|
|
"S-CRTM Contents",
|
|
"S-CRTM Version",
|
|
"CPU Microcode",
|
|
"Platform Config Flags",
|
|
"Table of Devices",
|
|
"Compact Hash",
|
|
"IPL",
|
|
"IPL Partition Data",
|
|
"Non-Host Code",
|
|
"Non-Host Config",
|
|
"Non-Host Info"
|
|
};
|
|
|
|
static const char* tcpa_pc_event_id_strings[] = {
|
|
"",
|
|
"SMBIOS",
|
|
"BIS Certificate",
|
|
"POST BIOS ",
|
|
"ESCD ",
|
|
"CMOS",
|
|
"NVRAM",
|
|
"Option ROM",
|
|
"Option ROM config",
|
|
"",
|
|
"Option ROM microcode ",
|
|
"S-CRTM Version",
|
|
"S-CRTM Contents ",
|
|
"POST Contents ",
|
|
"Table of Devices",
|
|
};
|
|
|
|
/* returns pointer to start of pos. entry of tcg log */
|
|
static void *tpm_bios_measurements_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
loff_t i;
|
|
struct tpm_bios_log *log = m->private;
|
|
void *addr = log->bios_event_log;
|
|
void *limit = log->bios_event_log_end;
|
|
struct tcpa_event *event;
|
|
|
|
/* read over *pos measurements */
|
|
for (i = 0; i < *pos; i++) {
|
|
event = addr;
|
|
|
|
if ((addr + sizeof(struct tcpa_event)) < limit) {
|
|
if (event->event_type == 0 && event->event_size == 0)
|
|
return NULL;
|
|
addr += sizeof(struct tcpa_event) + event->event_size;
|
|
}
|
|
}
|
|
|
|
/* now check if current entry is valid */
|
|
if ((addr + sizeof(struct tcpa_event)) >= limit)
|
|
return NULL;
|
|
|
|
event = addr;
|
|
|
|
if ((event->event_type == 0 && event->event_size == 0) ||
|
|
((addr + sizeof(struct tcpa_event) + event->event_size) >= limit))
|
|
return NULL;
|
|
|
|
return addr;
|
|
}
|
|
|
|
static void *tpm_bios_measurements_next(struct seq_file *m, void *v,
|
|
loff_t *pos)
|
|
{
|
|
struct tcpa_event *event = v;
|
|
struct tpm_bios_log *log = m->private;
|
|
void *limit = log->bios_event_log_end;
|
|
|
|
v += sizeof(struct tcpa_event) + event->event_size;
|
|
|
|
/* now check if current entry is valid */
|
|
if ((v + sizeof(struct tcpa_event)) >= limit)
|
|
return NULL;
|
|
|
|
event = v;
|
|
|
|
if (event->event_type == 0 && event->event_size == 0)
|
|
return NULL;
|
|
|
|
if ((event->event_type == 0 && event->event_size == 0) ||
|
|
((v + sizeof(struct tcpa_event) + event->event_size) >= limit))
|
|
return NULL;
|
|
|
|
(*pos)++;
|
|
return v;
|
|
}
|
|
|
|
static void tpm_bios_measurements_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
static int get_event_name(char *dest, struct tcpa_event *event,
|
|
unsigned char * event_entry)
|
|
{
|
|
const char *name = "";
|
|
/* 41 so there is room for 40 data and 1 nul */
|
|
char data[41] = "";
|
|
int i, n_len = 0, d_len = 0;
|
|
struct tcpa_pc_event *pc_event;
|
|
|
|
switch(event->event_type) {
|
|
case PREBOOT:
|
|
case POST_CODE:
|
|
case UNUSED:
|
|
case NO_ACTION:
|
|
case SCRTM_CONTENTS:
|
|
case SCRTM_VERSION:
|
|
case CPU_MICROCODE:
|
|
case PLATFORM_CONFIG_FLAGS:
|
|
case TABLE_OF_DEVICES:
|
|
case COMPACT_HASH:
|
|
case IPL:
|
|
case IPL_PARTITION_DATA:
|
|
case NONHOST_CODE:
|
|
case NONHOST_CONFIG:
|
|
case NONHOST_INFO:
|
|
name = tcpa_event_type_strings[event->event_type];
|
|
n_len = strlen(name);
|
|
break;
|
|
case SEPARATOR:
|
|
case ACTION:
|
|
if (MAX_TEXT_EVENT > event->event_size) {
|
|
name = event_entry;
|
|
n_len = event->event_size;
|
|
}
|
|
break;
|
|
case EVENT_TAG:
|
|
pc_event = (struct tcpa_pc_event *)event_entry;
|
|
|
|
/* ToDo Row data -> Base64 */
|
|
|
|
switch (pc_event->event_id) {
|
|
case SMBIOS:
|
|
case BIS_CERT:
|
|
case CMOS:
|
|
case NVRAM:
|
|
case OPTION_ROM_EXEC:
|
|
case OPTION_ROM_CONFIG:
|
|
case S_CRTM_VERSION:
|
|
name = tcpa_pc_event_id_strings[pc_event->event_id];
|
|
n_len = strlen(name);
|
|
break;
|
|
/* hash data */
|
|
case POST_BIOS_ROM:
|
|
case ESCD:
|
|
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[2*i], "%02x",
|
|
pc_event->event_data[i]);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return snprintf(dest, MAX_TEXT_EVENT, "[%.*s%.*s]",
|
|
n_len, name, d_len, data);
|
|
|
|
}
|
|
|
|
static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v)
|
|
{
|
|
struct tcpa_event *event = v;
|
|
char *data = v;
|
|
int i;
|
|
|
|
for (i = 0; i < sizeof(struct tcpa_event) + event->event_size; i++)
|
|
seq_putc(m, data[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_bios_measurements_release(struct inode *inode,
|
|
struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
struct tpm_bios_log *log = seq->private;
|
|
|
|
if (log) {
|
|
kfree(log->bios_event_log);
|
|
kfree(log);
|
|
}
|
|
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
|
|
{
|
|
int len = 0;
|
|
char *eventname;
|
|
struct tcpa_event *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 -EFAULT;
|
|
}
|
|
|
|
seq_printf(m, "%2d ", event->pcr_index);
|
|
|
|
/* 2nd: SHA1 */
|
|
seq_printf(m, "%20phN", event->pcr_value);
|
|
|
|
/* 3rd: event type identifier */
|
|
seq_printf(m, " %02x", event->event_type);
|
|
|
|
len += get_event_name(eventname, event, event_entry);
|
|
|
|
/* 4th: eventname <= max + \'0' delimiter */
|
|
seq_printf(m, " %s\n", eventname);
|
|
|
|
kfree(eventname);
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations tpm_ascii_b_measurments_seqops = {
|
|
.start = tpm_bios_measurements_start,
|
|
.next = tpm_bios_measurements_next,
|
|
.stop = tpm_bios_measurements_stop,
|
|
.show = tpm_ascii_bios_measurements_show,
|
|
};
|
|
|
|
static const struct seq_operations tpm_binary_b_measurments_seqops = {
|
|
.start = tpm_bios_measurements_start,
|
|
.next = tpm_bios_measurements_next,
|
|
.stop = tpm_bios_measurements_stop,
|
|
.show = tpm_binary_bios_measurements_show,
|
|
};
|
|
|
|
static int tpm_ascii_bios_measurements_open(struct inode *inode,
|
|
struct file *file)
|
|
{
|
|
int err;
|
|
struct tpm_bios_log *log;
|
|
struct seq_file *seq;
|
|
|
|
log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
|
|
if (!log)
|
|
return -ENOMEM;
|
|
|
|
if ((err = read_log(log)))
|
|
goto out_free;
|
|
|
|
/* now register seq file */
|
|
err = seq_open(file, &tpm_ascii_b_measurments_seqops);
|
|
if (!err) {
|
|
seq = file->private_data;
|
|
seq->private = log;
|
|
} else {
|
|
goto out_free;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
out_free:
|
|
kfree(log->bios_event_log);
|
|
kfree(log);
|
|
goto out;
|
|
}
|
|
|
|
static const struct file_operations tpm_ascii_bios_measurements_ops = {
|
|
.open = tpm_ascii_bios_measurements_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = tpm_bios_measurements_release,
|
|
};
|
|
|
|
static int tpm_binary_bios_measurements_open(struct inode *inode,
|
|
struct file *file)
|
|
{
|
|
int err;
|
|
struct tpm_bios_log *log;
|
|
struct seq_file *seq;
|
|
|
|
log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
|
|
if (!log)
|
|
return -ENOMEM;
|
|
|
|
if ((err = read_log(log)))
|
|
goto out_free;
|
|
|
|
/* now register seq file */
|
|
err = seq_open(file, &tpm_binary_b_measurments_seqops);
|
|
if (!err) {
|
|
seq = file->private_data;
|
|
seq->private = log;
|
|
} else {
|
|
goto out_free;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
out_free:
|
|
kfree(log->bios_event_log);
|
|
kfree(log);
|
|
goto out;
|
|
}
|
|
|
|
static const struct file_operations tpm_binary_bios_measurements_ops = {
|
|
.open = tpm_binary_bios_measurements_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = tpm_bios_measurements_release,
|
|
};
|
|
|
|
static int is_bad(void *p)
|
|
{
|
|
if (!p)
|
|
return 1;
|
|
if (IS_ERR(p) && (PTR_ERR(p) != -ENODEV))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
struct dentry **tpm_bios_log_setup(char *name)
|
|
{
|
|
struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
|
|
|
|
tpm_dir = securityfs_create_dir(name, NULL);
|
|
if (is_bad(tpm_dir))
|
|
goto out;
|
|
|
|
bin_file =
|
|
securityfs_create_file("binary_bios_measurements",
|
|
S_IRUSR | S_IRGRP, tpm_dir, NULL,
|
|
&tpm_binary_bios_measurements_ops);
|
|
if (is_bad(bin_file))
|
|
goto out_tpm;
|
|
|
|
ascii_file =
|
|
securityfs_create_file("ascii_bios_measurements",
|
|
S_IRUSR | S_IRGRP, tpm_dir, NULL,
|
|
&tpm_ascii_bios_measurements_ops);
|
|
if (is_bad(ascii_file))
|
|
goto out_bin;
|
|
|
|
ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
|
|
if (!ret)
|
|
goto out_ascii;
|
|
|
|
ret[0] = ascii_file;
|
|
ret[1] = bin_file;
|
|
ret[2] = tpm_dir;
|
|
|
|
return ret;
|
|
|
|
out_ascii:
|
|
securityfs_remove(ascii_file);
|
|
out_bin:
|
|
securityfs_remove(bin_file);
|
|
out_tpm:
|
|
securityfs_remove(tpm_dir);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
void tpm_bios_log_teardown(struct dentry **lst)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
securityfs_remove(lst[i]);
|
|
}
|