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From cf3f99c3b1e11c8c83938784975331db5efb410f Mon Sep 17 00:00:00 2001
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From: Matthew Garrett <mjg59@google.com>
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Date: Tue, 11 Dec 2018 15:25:44 -0800
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Subject: [PATCH 26/62] Remove call to TPM2 get_event_log()
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Calling the TPM2 get_event_log causes the firmware to start logging
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events to the final events table, but implementations may also continue
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logging to the boot services event log. Any OS that wishes to
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reconstruct the full PCR state must already look at both the final
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events log and the boot services event log, so if this call is made
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anywhere other than immediately before ExitBootServices() then the OS
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must deduplicate events that occur in both, complicating things
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immensely.
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Linux already has support for copying up the boot services event log
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across the ExitBootServices() boundary, so there's no reason to make
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this call. Remove it.
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Signed-off-by: Matthew Garrett <mjg59@google.com>
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Upstream-commit-id: fd7c3bd920b
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---
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tpm.c | 46 ----------------------------------------------
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1 file changed, 46 deletions(-)
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diff --git a/tpm.c b/tpm.c
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index 674e69b715f..f07362c70bb 100644
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--- a/tpm.c
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+++ b/tpm.c
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@@ -70,41 +70,6 @@ static BOOLEAN tpm2_present(EFI_TCG2_BOOT_SERVICE_CAPABILITY *caps,
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return FALSE;
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}
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-static inline EFI_TCG2_EVENT_LOG_BITMAP
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-tpm2_get_supported_logs(efi_tpm2_protocol_t *tpm,
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- EFI_TCG2_BOOT_SERVICE_CAPABILITY *caps,
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- BOOLEAN old_caps)
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-{
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- if (old_caps)
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- return ((TREE_BOOT_SERVICE_CAPABILITY *)caps)->SupportedEventLogs;
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-
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- return caps->SupportedEventLogs;
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-}
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-
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-/*
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- * According to TCG EFI Protocol Specification for TPM 2.0 family,
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- * all events generated after the invocation of EFI_TCG2_GET_EVENT_LOG
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- * shall be stored in an instance of an EFI_CONFIGURATION_TABLE aka
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- * EFI TCG 2.0 final events table. Hence, it is necessary to trigger the
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- * internal switch through calling get_event_log() in order to allow
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- * to retrieve the logs from OS runtime.
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- */
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-static EFI_STATUS trigger_tcg2_final_events_table(efi_tpm2_protocol_t *tpm2,
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- EFI_TCG2_EVENT_LOG_BITMAP supported_logs)
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-{
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- EFI_TCG2_EVENT_LOG_FORMAT log_fmt;
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- EFI_PHYSICAL_ADDRESS start;
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- EFI_PHYSICAL_ADDRESS end;
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- BOOLEAN truncated;
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-
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- if (supported_logs & EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
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- log_fmt = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
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- else
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- log_fmt = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
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-
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- return tpm2->get_event_log(tpm2, log_fmt, &start, &end, &truncated);
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-}
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-
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static EFI_STATUS tpm_locate_protocol(efi_tpm_protocol_t **tpm,
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efi_tpm2_protocol_t **tpm2,
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BOOLEAN *old_caps_p,
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@@ -166,17 +131,6 @@ static EFI_STATUS tpm_log_event_raw(EFI_PHYSICAL_ADDRESS buf, UINTN size,
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#endif
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} else if (tpm2) {
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EFI_TCG2_EVENT *event;
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- EFI_TCG2_EVENT_LOG_BITMAP supported_logs;
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-
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- supported_logs = tpm2_get_supported_logs(tpm2, &caps, old_caps);
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-
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- efi_status = trigger_tcg2_final_events_table(tpm2,
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- supported_logs);
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- if (EFI_ERROR(efi_status)) {
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- perror(L"Unable to trigger tcg2 final events table: %r\n",
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- efi_status);
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- return efi_status;
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- }
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event = AllocatePool(sizeof(*event) + logsize);
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if (!event) {
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--
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2.26.2
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