Hi Heinrich,
On Wed, 17 Nov 2021 at 01:24, Ilias Apalodimas ilias.apalodimas@linaro.org wrote:
When initializing the final event table in create_final_event() we are setting the initial buffer position to sizeof(*final_event). Although we clear the buffer correctly and won't cause any problems, we should start logging events starting from zero. While at it add a cast when defining the final_event.
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org
lib/efi_loader/efi_tcg2.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index 189e4a5ba59c..634556342a7c 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -1257,10 +1257,11 @@ static efi_status_t create_final_event(void) goto out;
memset(event_log.final_buffer, 0xff, TPM2_EVENT_LOG_SIZE);
final_event = event_log.final_buffer;
final_event =(struct efi_tcg2_final_events_table *)event_log.final_buffer; final_event->number_of_events = 0; final_event->version = EFI_TCG2_FINAL_EVENTS_TABLE_VERSION;
event_log.final_pos = sizeof(*final_event);
event_log.final_pos = 0; ret = efi_install_configuration_table(&efi_guid_final_events, final_event); if (ret != EFI_SUCCESS) {-- 2.33.1
After sending this I just realized it's wrong. The current code is correct, since we have to account for the number of events and version
Sorry for the noise
Cheers /Ilias