diff options
Diffstat (limited to 'tpm.c')
| -rw-r--r-- | tpm.c | 70 |
1 files changed, 58 insertions, 12 deletions
@@ -119,28 +119,60 @@ static EFI_STATUS trigger_tcg2_final_events_table(efi_tpm2_protocol_t *tpm2, &start, &end, &truncated); } -static EFI_STATUS tpm_log_event_raw(EFI_PHYSICAL_ADDRESS buf, UINTN size, - UINT8 pcr, const CHAR8 *log, UINTN logsize, - UINT32 type, CHAR8 *hash) +static EFI_STATUS tpm_locate_protocol(efi_tpm_protocol_t **tpm, + efi_tpm2_protocol_t **tpm2, + BOOLEAN *old_caps_p, + EFI_TCG2_BOOT_SERVICE_CAPABILITY *capsp) { EFI_STATUS status; - efi_tpm_protocol_t *tpm; - efi_tpm2_protocol_t *tpm2; - status = LibLocateProtocol(&tpm2_guid, (VOID **)&tpm2); + *tpm = NULL; + *tpm2 = NULL; + status = LibLocateProtocol(&tpm2_guid, (VOID **)tpm2); /* TPM 2.0 */ if (status == EFI_SUCCESS) { BOOLEAN old_caps; - EFI_TCG2_EVENT *event; EFI_TCG2_BOOT_SERVICE_CAPABILITY caps; - EFI_TCG2_EVENT_LOG_BITMAP supported_logs; - status = tpm2_get_caps(tpm2, &caps, &old_caps); - if (status != EFI_SUCCESS) + status = tpm2_get_caps(*tpm2, &caps, &old_caps); + if (EFI_ERROR(status)) + return status; + + if (tpm2_present(&caps, old_caps)) { + if (old_caps_p) + *old_caps_p = old_caps; + if (capsp) + memcpy(capsp, &caps, sizeof(caps)); return EFI_SUCCESS; + } + } else { + status = LibLocateProtocol(&tpm_guid, (VOID **)tpm); + if (EFI_ERROR(status)) + return status; - if (!tpm2_present(&caps, old_caps)) + if (tpm_present(*tpm)) return EFI_SUCCESS; + } + + return EFI_NOT_FOUND; +} + +static EFI_STATUS tpm_log_event_raw(EFI_PHYSICAL_ADDRESS buf, UINTN size, + UINT8 pcr, const CHAR8 *log, UINTN logsize, + UINT32 type, CHAR8 *hash) +{ + EFI_STATUS status; + efi_tpm_protocol_t *tpm; + efi_tpm2_protocol_t *tpm2; + BOOLEAN old_caps; + EFI_TCG2_BOOT_SERVICE_CAPABILITY caps; + + status = tpm_locate_protocol(&tpm, &tpm2, &old_caps, &caps); + if (EFI_ERROR(status)) { + return status; + } else if (tpm2) { + EFI_TCG2_EVENT *event; + EFI_TCG2_EVENT_LOG_BITMAP supported_logs; supported_logs = tpm2_get_supported_logs(tpm2, &caps, old_caps); @@ -176,7 +208,7 @@ static EFI_STATUS tpm_log_event_raw(EFI_PHYSICAL_ADDRESS buf, UINTN size, } FreePool(event); return status; - } else { + } else if (tpm) { TCG_PCR_EVENT *event; UINT32 eventnum = 0; EFI_PHYSICAL_ADDRESS lastevent; @@ -221,6 +253,7 @@ static EFI_STATUS tpm_log_event_raw(EFI_PHYSICAL_ADDRESS buf, UINTN size, return EFI_SUCCESS; } + EFI_STATUS tpm_log_event(EFI_PHYSICAL_ADDRESS buf, UINTN size, UINT8 pcr, const CHAR8 *description) { @@ -344,3 +377,16 @@ EFI_STATUS tpm_measure_variable(CHAR16 *VarName, EFI_GUID VendorGuid, UINTN VarS return tpm_record_data_measurement(VarName, VendorGuid, VarSize, VarData); } + +EFI_STATUS +fallback_should_prefer_reset(void) +{ + EFI_STATUS status; + efi_tpm_protocol_t *tpm; + efi_tpm2_protocol_t *tpm2; + + status = tpm_locate_protocol(&tpm, &tpm2, NULL, NULL); + if (EFI_ERROR(status)) + return EFI_NOT_FOUND; + return EFI_SUCCESS; +} |