72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2017 Google
|
|
*
|
|
* Authors:
|
|
* Thiebaud Weksteen <tweek@google.com>
|
|
*
|
|
* 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/efi.h>
|
|
#include <linux/tpm_eventlog.h>
|
|
|
|
#include "../tpm.h"
|
|
#include "common.h"
|
|
|
|
/* read binary bios log from EFI configuration table */
|
|
int tpm_read_log_efi(struct tpm_chip *chip)
|
|
{
|
|
|
|
struct linux_efi_tpm_eventlog *log_tbl;
|
|
struct tpm_bios_log *log;
|
|
u32 log_size;
|
|
u8 tpm_log_version;
|
|
|
|
if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
|
|
return -ENODEV;
|
|
|
|
if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
|
|
return -ENODEV;
|
|
|
|
log = &chip->log;
|
|
|
|
log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB);
|
|
if (!log_tbl) {
|
|
pr_err("Could not map UEFI TPM log table !\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
log_size = log_tbl->size;
|
|
memunmap(log_tbl);
|
|
|
|
if (!log_size) {
|
|
pr_warn("UEFI TPM log area empty\n");
|
|
return -EIO;
|
|
}
|
|
|
|
log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size,
|
|
MEMREMAP_WB);
|
|
if (!log_tbl) {
|
|
pr_err("Could not map UEFI TPM log table payload!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* malloc EventLog space */
|
|
log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
|
|
if (!log->bios_event_log)
|
|
goto err_memunmap;
|
|
log->bios_event_log_end = log->bios_event_log + log_size;
|
|
|
|
tpm_log_version = log_tbl->version;
|
|
memunmap(log_tbl);
|
|
return tpm_log_version;
|
|
|
|
err_memunmap:
|
|
memunmap(log_tbl);
|
|
return -ENOMEM;
|
|
}
|