[PATCH] SecurityPkg/PhysicalPresenceLib: Reject illegal PCR bank allocation

["Zhang, Chao B" <chao.b.zhang@intel.com>]

According to TCG PP1.3 spec, error PCR bank allocation input should be
rejected by Physical Presence. Firmware has to ensure that at least one
PCR banks is active.

Cc: Long Qin <qin.long@intel.com>
Cc: Yao Jiewen <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
---
 .../DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c b/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c
index 5bf95a1..5ece8e5 100644
--- a/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c
+++ b/SecurityPkg/Library/DxeTcg2PhysicalPresenceLib/DxeTcg2PhysicalPresenceLib.c
@@ -186,6 +186,18 @@ Tcg2ExecutePhysicalPresence (
     case TCG2_PHYSICAL_PRESENCE_SET_PCR_BANKS:
       Status = Tpm2GetCapabilitySupportedAndActivePcrs (&TpmHashAlgorithmBitmap, &ActivePcrBanks);
       ASSERT_EFI_ERROR (Status);
+
+      //
+      // PP spec requirements:
+      //    Firmware should check that all requested (set) hashing algorithms are supported with respective PCR banks.
+      //    Firmware has to ensure that at least one PCR banks is active.
+      // If not, an error is returned and no action is taken.
+      //
+      if (CommandParameter == 0 || (CommandParameter & (~TpmHashAlgorithmBitmap)) != 0) {
+        DEBUG((DEBUG_ERROR, "PCR banks %x to allocate are not supported by TPM. Skip operation\n", CommandParameter));
+        return TCG_PP_OPERATION_RESPONSE_BIOS_FAILURE;
+      }
+
       Status = Tpm2PcrAllocateBanks (PlatformAuth, TpmHashAlgorithmBitmap, CommandParameter);
       if (EFI_ERROR (Status)) {
         return TCG_PP_OPERATION_RESPONSE_BIOS_FAILURE;
-- 
1.9.5.msysgit.1