[edk2-devel] [PATCH] UefiCpuPkg/MicrocodeMeasurementDxe: Fix exception

[Darbin Reyes]

+ @UefiCpuPkg Maintainers

Requesting an estimated ETA on integration of this 1 character patch.

I understand the patch queue is huge, just looking to provide a realistic expectation to those who are blocked by this and waiting for me to provide an update.

Warm Regards,
Darbin
________________________________
From: devel at edk2.groups.io <devel at edk2.groups.io> on behalf of Darbin Reyes <darbin.reyes at intel.com>
Sent: Tuesday, March 7, 2023 3:04 PM
To: devel at edk2.groups.io <devel at edk2.groups.io>
Cc: Reyes, Darbin <darbin.reyes at intel.com>; Narey, Jacob <jacob.narey at intel.com>
Subject: [edk2-devel] [PATCH] UefiCpuPkg/MicrocodeMeasurementDxe: Fix exception

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4360

An incorrect format specifier is being used in a DEBUG print,
specifically, a variable of type EFI_STATUS was being printed with
the %a format specifier (pointer to an ASCII string), thus the value of
the Status variable was being treated as the address of a string,
leading to a CPU exception, when encountered this bug manifests itself
as a hang near "Ready to Boot Event", with the last DEBUG print being
"INFO: Got MicrocodePatchHob with microcode patches starting address"
followed by a CPU Exception dump.

Signed-off-by: Darbin Reyes <darbin.reyes at intel.com>
Reviewed-by: Jacob Narey <jacob.narey at intel.com>
---
 UefiCpuPkg/MicrocodeMeasurementDxe/MicrocodeMeasurementDxe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/UefiCpuPkg/MicrocodeMeasurementDxe/MicrocodeMeasurementDxe.c b/UefiCpuPkg/MicrocodeMeasurementDxe/MicrocodeMeasurementDxe.c
index 762ca159ff..5fd3b3365c 100644
--- a/UefiCpuPkg/MicrocodeMeasurementDxe/MicrocodeMeasurementDxe.c
+++ b/UefiCpuPkg/MicrocodeMeasurementDxe/MicrocodeMeasurementDxe.c
@@ -238,7 +238,7 @@ MeasureMicrocodePatches (
        TotalMicrocodeSize)

       );

   } else {

-    DEBUG ((DEBUG_ERROR, "ERROR: TpmMeasureAndLogData failed with status %a!\n", Status));

+    DEBUG ((DEBUG_ERROR, "ERROR: TpmMeasureAndLogData failed with status %r!\n", Status));

   }



   FreePool (Offsets);

--
2.38.1.windows.1



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