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shim: trigger to record further logs to tcg 2.0 final event log area

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According to TCG EFI Protocol Specification for TPM 2.0 family,
all events generated after the invocation of EFI_TCG2_GET_EVENT_LOG
shall be stored in an instance of an EFI_CONFIGURATION_TABLE aka
EFI TCG 2.0 final events table. Hence, it is necessary to trigger the
internal switch through calling get_event_log() in order to allow
to retrieve the logs from OS runtime.

Signed-off-by: Lans Zhang <jia.zhang@windriver.com>
This commit is contained in:
Lans Zhang 2016-09-30 10:46:31 +08:00 committed by Peter Jones
parent 6c180c6004
commit d3884fe833
2 changed files with 23 additions and 0 deletions
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21
tpm.c
View File

@ -61,6 +61,21 @@ static BOOLEAN tpm2_present(efi_tpm2_protocol_t *tpm)
return FALSE;
}
/*
* According to TCG EFI Protocol Specification for TPM 2.0 family,
* all events generated after the invocation of EFI_TCG2_GET_EVENT_LOG
* shall be stored in an instance of an EFI_CONFIGURATION_TABLE aka
* EFI TCG 2.0 final events table. Hence, it is necessary to trigger the
* internal switch through calling get_event_log() in order to allow
* to retrieve the logs from OS runtime.
*/
static EFI_STATUS trigger_tcg2_final_events_table(efi_tpm2_protocol_t *tpm2)
{
return uefi_call_wrapper(tpm2->get_event_log, 5, tpm2,
EFI_TCG2_EVENT_LOG_FORMAT_TCG_2, NULL,
NULL, NULL);
}
EFI_STATUS tpm_log_event(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 pcr,
const CHAR8 *description)
{
@ -76,6 +91,12 @@ EFI_STATUS tpm_log_event(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 pcr,
if (!tpm2_present(tpm2))
return EFI_SUCCESS;
status = trigger_tcg2_final_events_table(tpm2);
if (EFI_ERROR(status)) {
perror(L"Unable to trigger tcg2 final events table\n");
return status;
}
event = AllocatePool(sizeof(*event) + strlen(description) + 1);
if (!event) {
perror(L"Unable to allocate event structure\n");

2
tpm.h
View File

@ -114,6 +114,8 @@ typedef struct tdEFI_TCG2_EVENT {
uint8_t Event[1];
} __attribute__ ((packed)) EFI_TCG2_EVENT;
#define EFI_TCG2_EVENT_LOG_FORMAT_TCG_2 0x00000002
struct efi_tpm2_protocol
{
EFI_STATUS (EFIAPI *get_capability) (struct efi_tpm2_protocol *this,