--- lib/efi_loader/efi_tcg2.c | 90 ++++++++++++++++++++++++++------------- 1 file changed, 61 insertions(+), 29 deletions(-)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index 189e4a5ba5..215f4b2b04 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -34,6 +34,7 @@ struct event_log_buffer { size_t final_pos; /* final events config table position */ size_t last_event_size; bool get_event_called; + bool ebs_called; bool truncated; };
@@ -186,39 +187,29 @@ static efi_status_t tcg2_pcr_extend(struct udevice *dev, u32 pcr_index, return EFI_SUCCESS; }
-/* tcg2_agile_log_append - Append an agile event to out eventlog +/* put_event - Append an agile event to an eventlog * * @pcr_index: PCR index * @event_type: type of event added * @digest_list: list of digest algorithms to add * @size: size of event * @event: event to add + * @log: log buffer to append the event * - * @Return: status code */ -static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type, - struct tpml_digest_values *digest_list, - u32 size, u8 event[]) +static void put_event(u32 pcr_index, u32 event_type, + struct tpml_digest_values *digest_list, u32 size, + u8 event[], void *log) { - void *log = (void *)((uintptr_t)event_log.buffer + event_log.pos); size_t pos; size_t i; u32 event_size;
- if (event_log.get_event_called) - log = (void *)((uintptr_t)event_log.final_buffer + - event_log.final_pos); - /* * size refers to the length of event[] only, we need to check against * the final tcg_pcr_event2 size */ event_size = size + tcg_event_final_size(digest_list); - if (event_log.pos + event_size > TPM2_EVENT_LOG_SIZE || - event_log.final_pos + event_size > TPM2_EVENT_LOG_SIZE) { - event_log.truncated = true; - return EFI_VOLUME_FULL; - }
put_unaligned_le32(pcr_index, log); pos = offsetof(struct tcg_pcr_event2, event_type); @@ -242,25 +233,64 @@ static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type, memcpy((void *)((uintptr_t)log + pos), event, size); pos += size;
- /* make sure the calculated buffer is what we checked against */ + /* + * make sure the calculated buffer is what we checked against + * This check should never fail. It checks the code above is + * calculating the right length for the event we are adding + * */ if (pos != event_size) - return EFI_INVALID_PARAMETER; + log_err("Appending to the EventLog failed\n");
- /* if GetEventLog hasn't been called update the normal log */ - if (!event_log.get_event_called) { - event_log.pos += pos; - event_log.last_event_size = pos; - } else { - /* if GetEventLog has been called update config table log */ - struct efi_tcg2_final_events_table *final_event; +}
- final_event = - (struct efi_tcg2_final_events_table *)(event_log.final_buffer); - final_event->number_of_events++; - event_log.final_pos += pos; +/* tcg2_agile_log_append - Append an agile event to an eventlog + * + * @pcr_index: PCR index + * @event_type: type of event added + * @digest_list: list of digest algorithms to add + * @size: size of event + * @event: event to add + * @log: log buffer to append the event + * + * @Return: status code + */ +static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type, + struct tpml_digest_values *digest_list, + u32 size, u8 event[]) +{ + void *log = (void *)((uintptr_t)event_log.buffer + event_log.pos); + u32 event_size = size + tcg_event_final_size(digest_list); + struct efi_tcg2_final_events_table *final_event; + efi_status_t ret = EFI_SUCCESS; + + /* if ExitBootServices hasn't been called update the normal log */ + if (!event_log.ebs_called) { + if (event_log.truncated || + event_log.pos + event_size > TPM2_EVENT_LOG_SIZE) { + event_log.truncated = true; + return EFI_VOLUME_FULL; + } + put_event(pcr_index, event_type, digest_list, size, event, log); + event_log.pos += event_size; + event_log.last_event_size = event_size; }
- return EFI_SUCCESS; + if (!event_log.get_event_called) + return ret; + + /* if GetEventLog has been called update FinalEventLog as well */ + if (event_log.final_pos + event_size > TPM2_EVENT_LOG_SIZE) + return EFI_VOLUME_FULL; + + log = (void *)((uintptr_t)event_log.final_buffer + event_log.final_pos); + put_event(pcr_index, event_type, digest_list, size, event, log); + + final_event = + (struct efi_tcg2_final_events_table *)event_log.final_buffer; + final_event->number_of_events++; + event_log.final_pos += event_size; + + return ret; }
/** @@ -1303,6 +1333,7 @@ static efi_status_t efi_init_event_log(void) event_log.pos = 0; event_log.last_event_size = 0; event_log.get_event_called = false; + event_log.ebs_called = false; event_log.truncated = false;
/* @@ -1792,6 +1823,7 @@ efi_tcg2_notify_exit_boot_services(struct efi_event *event, void *context)
EFI_ENTRY("%p, %p", event, context);
+ event_log.ebs_called = true; ret = platform_get_tpm2_device(&dev); if (ret != EFI_SUCCESS) goto out;