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security/tpm: Fix TPM 1.2 state machine issues 

* Fix ACPI resume path compilation for TPM ramstage
  driver
* Move enabling of the TPM prior activation and remove
  reboot return status from TPM enable.

More information can be found via the TCG
specification v1.2

Tested=Elgon

Change-Id: Ided110e0c1889b302e29acac6d8d2341f97eb10b
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/28085
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Philipp Deppenwiese 2018-08-14 09:46:55 -07:00 committed by Philipp Deppenwiese
parent e155e78a47
commit 4d2af9df7c
2 changed files with 18 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/drivers/tpm/tpm.c
View File

@ -18,16 +18,18 @@
#include <bootstate.h>
#include <security/tpm/tspi.h>
#if IS_ENABLED(CONFIG_ARCH_X86)
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
#include <arch/acpi.h>
#endif
static void init_tpm_dev(void *unused)
{
#if IS_ENABLED(CONFIG_ARCH_X86)
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
int s3resume = acpi_is_wakeup_s3();
tpm_setup(s3resume);
#else
/* This can lead to PCR reset attacks but currently there
is no generic way to detect resume on other platforms. */
tpm_setup(false);
#endif
}

31
src/security/tpm/tspi/tspi.c
View File

@ -25,17 +25,27 @@
#if IS_ENABLED(CONFIG_TPM1)
static uint32_t tpm1_invoke_state_machine(void)
{
uint8_t disable;
uint8_t disabled;
uint8_t deactivated;
uint32_t result = TPM_SUCCESS;
/* Check that the TPM is enabled and activated. */
result = tlcl_get_flags(&disable, &deactivated, NULL);
result = tlcl_get_flags(&disabled, &deactivated, NULL);
if (result != TPM_SUCCESS) {
printk(BIOS_ERR, "TPM: Can't read capabilities.\n");
return result;
}
if (disabled) {
printk(BIOS_INFO, "TPM: is disabled. Enabling...\n");
result = tlcl_set_enable();
if (result != TPM_SUCCESS) {
printk(BIOS_ERR, "TPM: Can't set enabled state.\n");
return result;
}
}
if (!!deactivated != IS_ENABLED(CONFIG_TPM_DEACTIVATE)) {
printk(BIOS_INFO,
"TPM: Unexpected TPM deactivated state. Toggling...\n");
@ -50,19 +60,6 @@ static uint32_t tpm1_invoke_state_machine(void)
result = TPM_E_MUST_REBOOT;
}
if (disable && !deactivated) {
printk(BIOS_INFO, "TPM: disabled (%d). Enabling...\n", disable);
result = tlcl_set_enable();
if (result != TPM_SUCCESS) {
printk(BIOS_ERR, "TPM: Can't set enabled state.\n");
return result;
}
printk(BIOS_INFO, "TPM: Must reboot to re-enable\n");
result = TPM_E_MUST_REBOOT;
}
return result;
}
#endif
@ -122,8 +119,8 @@ uint32_t tpm_setup(int s3flag)
result = tlcl_physical_presence_cmd_enable();
if (result != TPM_SUCCESS) {
printk(
BIOS_ERR,
"TPM: Can't enable physical presence command.\n");
BIOS_ERR,
"TPM: Can't enable physical presence command.\n");
goto out;
}