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/*
* tb_error.c: support functions for tb_error_t type
*
* Copyright (c) 2006-2010, Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <config.h>
#include <efibase.h>
#include <types.h>
#include <stdbool.h>
#include <printk.h>
#include <compiler.h>
#include <string.h>
#include <misc.h>
#include <uuid.h>
#include <uuid.h>
#include <hash.h>
#include <tb_error.h>
#include <tb_policy.h>
#include <tpm.h>
#include <eficore.h>
#include <tboot.h>
#include <txt/config_regs.h>
#define TB_LAUNCH_ERR_IDX 0x20000002 /* launch error index */
static bool no_err_idx;
/*
* print_tb_error_msg
*
* print tb policy error message
*
*/
void print_tb_error_msg(tb_error_t error)
{
switch( error ) {
case TB_ERR_NONE:
printk(TBOOT_INFO"succeeded.\n");
break;
case TB_ERR_FIXED:
printk(TBOOT_INFO"previous error has been fixed.\n");
break;
case TB_ERR_GENERIC:
printk(TBOOT_WARN"non-fatal generic error.\n");
break;
case TB_ERR_TPM_NOT_READY:
printk(TBOOT_WARN"TPM not ready.\n");
break;
case TB_ERR_SMX_NOT_SUPPORTED:
printk(TBOOT_WARN"SMX not supported.\n");
break;
case TB_ERR_VMX_NOT_SUPPORTED:
printk(TBOOT_ERR"VMX not supported.\n");
break;
case TB_ERR_TXT_NOT_SUPPORTED:
printk(TBOOT_ERR"TXT not supported.\n");
break;
case TB_ERR_MODULES_NOT_IN_POLICY:
printk(TBOOT_ERR"modules in mbi but not in policy.\n");
break;
case TB_ERR_MODULE_VERIFICATION_FAILED:
printk(TBOOT_ERR"verifying module against policy failed.\n");
break;
case TB_ERR_POLICY_INVALID:
printk(TBOOT_ERR"policy invalid.\n");
break;
case TB_ERR_POLICY_NOT_PRESENT:
printk(TBOOT_WARN"no policy in TPM NV.\n");
break;
case TB_ERR_SINIT_NOT_PRESENT:
printk(TBOOT_WARN"SINIT ACM not provided.\n");
break;
case TB_ERR_ACMOD_VERIFY_FAILED:
printk(TBOOT_WARN"verifying AC module failed.\n");
break;
case TB_ERR_POST_LAUNCH_VERIFICATION:
printk(TBOOT_ERR"verification of post-launch failed.\n");
break;
case TB_ERR_S3_INTEGRITY:
printk(TBOOT_ERR"creation or verification of S3 measurements failed.\n");
break;
case TB_ERR_FATAL:
printk(TBOOT_ERR"generic fatal error.\n");
break;
case TB_ERR_NV_VERIFICATION_FAILED:
printk(TBOOT_ERR"verifying nv against policy failed.\n");
break;
default:
printk(TBOOT_ERR"unknown error (%d).\n", error);
break;
}
}
/*
* read_tb_error_code
*
* read error code from TPM NV (TB_LAUNCH_ERR_IDX)
*
*/
bool read_tb_error_code(tb_error_t *error)
{
uint32_t size = sizeof(tb_error_t);
if ( error == NULL ) {
printk(TBOOT_ERR"Error: error pointer is zero.\n");
return false;
}
memset(error, 0, size);
/* read! */
if ( !g_tpm->nv_read(g_tpm, 0, g_tpm->tb_err_index, 0,
(uint8_t *)error, &size) ) {
printk(TBOOT_WARN"Error: read TPM error: 0x%x.\n", g_tpm->error);
no_err_idx = true;
return false;
}
no_err_idx = false;
return true;
}
/*
* write_tb_error_code
*
* write error code into TPM NV (TB_LAUNCH_ERR_IDX)
*
*/
bool write_tb_error_code(tb_error_t error)
{
if ( !g_tpm || no_err_idx )
return false;
if ( !g_tpm->nv_write(g_tpm, g_tpm->cur_loc, g_tpm->tb_err_index, 0,
(uint8_t *)&error, sizeof(tb_error_t)) ) {
printk(TBOOT_WARN"Error: write TPM error: 0x%x.\n", g_tpm->error);
no_err_idx = true;
return false;
}
return true;
}
/*
* was_last_boot_error
* false: no error; true: error
*/
bool was_last_boot_error(void)
{
tb_error_t error;
txt_errorcode_t txt_err;
/* check TB_LAUNCH_ERR_IDX */
if ( read_tb_error_code(&error) ) {
if ( error != TB_ERR_FIXED )
return true;
}
/* check TXT.ERRORCODE */
txt_err = (txt_errorcode_t)read_pub_config_reg(TXTCR_ERRORCODE);
if ( txt_err.valid && txt_err.type > 0 )
return true;
return false;
}
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