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* [PATCH] SecurityPkg: Fix TPM2 ACPI measurement.
@ 2019-11-06  1:00 Lin, Derek (HPS SW)
  2019-11-06  1:31 ` Yao, Jiewen
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Lin, Derek (HPS SW) @ 2019-11-06  1:00 UTC (permalink / raw)
  To: derek.lin2, devel; +Cc: jason.spottswood, jiewen.yao, jian.j.wang, chao.b.zhang

We have discussed in this thread.
https://edk2.groups.io/g/devel/topic/32205028

Before the change, TPM FW upgrade will impact TPM2 ACPI PCR value because
TPM2 ACPI HID include FW version.

This change make the measurement before TPM2 HID fixup. So, after TPM FW
upgrade, the ACPI PCR record remains the same.

Signed-off-by: Derek Lin <derek.lin2@hpe.com>
---
 SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c b/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
index bd786bf479..54966c83ce 100644
--- a/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
+++ b/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
@@ -664,7 +664,22 @@ PublishAcpiTable (
     ));
 
   //
-  // Update TPM2 HID before measuring it to PCR
+  // Measure to PCR[0] with event EV_POST_CODE ACPI DATA.
+  // The measurement has to be done before UpdateHID since TPM2 ACPI HID
+  // imply TPM Firmware Version. Otherwise, the PCR record would be
+  // different after TPM FW update.
+  //
+  TpmMeasureAndLogData(
+    0,
+    EV_POST_CODE,
+    EV_POSTCODE_INFO_ACPI_DATA,
+    ACPI_DATA_LEN,
+    Table,
+    TableSize
+    );
+
+  //
+  // Update TPM2 HID after measuring it to PCR
   //
   Status = UpdateHID(Table);
   if (EFI_ERROR(Status)) {
@@ -694,19 +709,6 @@ PublishAcpiTable (
     }
   }
 
-  //
-  // Measure to PCR[0] with event EV_POST_CODE ACPI DATA
-  //
-  TpmMeasureAndLogData(
-    0,
-    EV_POST_CODE,
-    EV_POSTCODE_INFO_ACPI_DATA,
-    ACPI_DATA_LEN,
-    Table,
-    TableSize
-    );
-
-
   ASSERT (Table->OemTableId == SIGNATURE_64 ('T', 'p', 'm', '2', 'T', 'a', 'b', 'l'));
   CopyMem (Table->OemId, PcdGetPtr (PcdAcpiDefaultOemId), sizeof (Table->OemId) );
   mTcgNvs = AssignOpRegion (Table, SIGNATURE_32 ('T', 'N', 'V', 'S'), (UINT16) sizeof (TCG_NVS));
-- 
2.20.1.windows.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2019-11-07  5:13 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-11-06  1:00 [PATCH] SecurityPkg: Fix TPM2 ACPI measurement Lin, Derek (HPS SW)
2019-11-06  1:31 ` Yao, Jiewen
2019-11-06  6:17 ` Wang, Jian J
2019-11-07  5:13 ` Wang, Jian J

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