1. Update the logic of UpdateVariable() for updating variable from:

set old variable to IN_DELETED_TRANSITION -> check if reclaim is needed(If yes, do reclaim) -> add new variable -> set old variable to DELETED if no reclaim happened.
to:
set old variable to IN_DELETED_TRANSITION -> check if reclaim is needed(If yes, do reclaim) -> add new variable -> set old variable to DELETED.
2. Update UpdateVariable() to correctly handle the case "both ADDED and IN_DELETED_TRANSITION variable are present", and delete both old ADDED and IN_DELETED_TRANSITION variable when deleting or updating variable.
3. Update VariableServiceGetNextVariableName() to return the valid IN_DELETED_TRANSITION variable if only IN_DELETED_TRANSITION variable is present.

Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14065 6f19259b-4bc3-4df7-8a09-765794883524

2 files changed, 116 insertions, 18 deletions

diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c
index b192731ef..c70b467ff 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c
@@ -655,7 +655,7 @@ PubKeyStoreFilter (
   @param[out]  LastVariableOffset      Offset of last variable.

   @param[in]   IsVolatile              The variable store is volatile or not;

                                        if it is non-volatile, need FTW.

-  @param[in]   UpdatingVariable        Pointer to updating variable.

+  @param[in, out] UpdatingPtrTrack     Pointer to updating variable pointer track structure.

   @param[in]   ReclaimPubKeyStore      Reclaim for public key database or not.

   @param[in]   ReclaimAnyway           If TRUE, do reclaim anyway.

   

@@ -669,7 +669,7 @@ Reclaim (
   IN  EFI_PHYSICAL_ADDRESS  VariableBase,

   OUT UINTN                 *LastVariableOffset,

   IN  BOOLEAN               IsVolatile,

-  IN  VARIABLE_HEADER       *UpdatingVariable,

+  IN OUT VARIABLE_POINTER_TRACK *UpdatingPtrTrack,

   IN  BOOLEAN               ReclaimPubKeyStore,

   IN  BOOLEAN               ReclaimAnyway

   )

@@ -699,6 +699,12 @@ Reclaim (
   UINT32                NewPubKeySize;

   VARIABLE_HEADER       *PubKeyHeader;

   BOOLEAN               NeedDoReclaim;

+  VARIABLE_HEADER       *UpdatingVariable;

+

+  UpdatingVariable = NULL;

+  if (UpdatingPtrTrack != NULL) {

+    UpdatingVariable = UpdatingPtrTrack->CurrPtr;

+  }

 

   NeedDoReclaim = FALSE;

   VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) VariableBase);

@@ -853,6 +859,8 @@ Reclaim (
     if (UpdatingVariable != NULL) {

       VariableSize = (UINTN)(GetNextVariablePtr (UpdatingVariable)) - (UINTN)UpdatingVariable;

       CopyMem (CurrPtr, (UINT8 *) UpdatingVariable, VariableSize);

+      UpdatingPtrTrack->CurrPtr = (VARIABLE_HEADER *)((UINTN)UpdatingPtrTrack->StartPtr + ((UINTN)CurrPtr - (UINTN)GetStartPointer ((VARIABLE_STORE_HEADER *) ValidBuffer)));

+      UpdatingPtrTrack->InDeletedTransitionPtr = NULL;

       CurrPtr += VariableSize;

       if ((!IsVolatile) && ((UpdatingVariable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {

           HwErrVariableTotalSize += VariableSize;

@@ -885,7 +893,7 @@ Reclaim (
              ) {

             Point0 = (VOID *) GetVariableNamePtr (AddedVariable);

             Point1 = (VOID *) GetVariableNamePtr (Variable);

-            if (CompareMem (Point0, Point1, NameSizeOfVariable (AddedVariable)) == 0) {

+            if (CompareMem (Point0, Point1, NameSize) == 0) {

               FoundAdded = TRUE;

               break;

             }

@@ -987,6 +995,8 @@ FindVariableEx (
   VARIABLE_HEADER                *InDeletedVariable;

   VOID                           *Point;

 

+  PtrTrack->InDeletedTransitionPtr = NULL;

+

   //

   // Find the variable by walk through HOB, volatile and non-volatile variable store.

   //

@@ -1004,6 +1014,7 @@ FindVariableEx (
           if (PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {

             InDeletedVariable   = PtrTrack->CurrPtr;

           } else {

+            PtrTrack->InDeletedTransitionPtr = InDeletedVariable;

             return EFI_SUCCESS;

           }

         } else {

@@ -1015,6 +1026,7 @@ FindVariableEx (
               if (PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {

                 InDeletedVariable     = PtrTrack->CurrPtr;

               } else {

+                PtrTrack->InDeletedTransitionPtr = InDeletedVariable;

                 return EFI_SUCCESS;

               }

             }

@@ -1606,7 +1618,7 @@ AutoUpdateLangVariable (
   @param[in] Attributes         Attributes of the variable.

   @param[in] KeyIndex           Index of associated public key.

   @param[in] MonotonicCount     Value of associated monotonic count.

-  @param[in] CacheVariable      The variable information which is used to keep track of variable usage.

+  @param[in, out] CacheVariable The variable information which is used to keep track of variable usage.

   @param[in] TimeStamp          Value of associated TimeStamp.

 

   @retval EFI_SUCCESS           The update operation is success.

@@ -1622,7 +1634,7 @@ UpdateVariable (
   IN      UINT32                      Attributes      OPTIONAL,

   IN      UINT32                      KeyIndex        OPTIONAL,

   IN      UINT64                      MonotonicCount  OPTIONAL,

-  IN      VARIABLE_POINTER_TRACK      *CacheVariable,

+  IN OUT  VARIABLE_POINTER_TRACK      *CacheVariable,

   IN      EFI_TIME                    *TimeStamp      OPTIONAL

   )

 {

@@ -1638,7 +1650,6 @@ UpdateVariable (
   BOOLEAN                             Volatile;

   EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *Fvb;

   UINT8                               State;

-  BOOLEAN                             Reclaimed;

   VARIABLE_POINTER_TRACK              *Variable;

   VARIABLE_POINTER_TRACK              NvVariable;

   VARIABLE_STORE_HEADER               *VariableStoreHeader;

@@ -1678,11 +1689,15 @@ UpdateVariable (
     Variable->StartPtr = GetStartPointer (VariableStoreHeader);

     Variable->EndPtr   = GetEndPointer (VariableStoreHeader);

     Variable->CurrPtr  = (VARIABLE_HEADER *)((UINTN)Variable->StartPtr + ((UINTN)CacheVariable->CurrPtr - (UINTN)CacheVariable->StartPtr));

+    if (CacheVariable->InDeletedTransitionPtr != NULL) {

+      Variable->InDeletedTransitionPtr = (VARIABLE_HEADER *)((UINTN)Variable->StartPtr + ((UINTN)CacheVariable->InDeletedTransitionPtr - (UINTN)CacheVariable->StartPtr));

+    } else {

+      Variable->InDeletedTransitionPtr = NULL;

+    }

     Variable->Volatile = FALSE;

   }

 

   Fvb       = mVariableModuleGlobal->FvbInstance;

-  Reclaimed = FALSE;

 

   //

   // Tricky part: Use scratch data area at the end of volatile variable store

@@ -1730,6 +1745,31 @@ UpdateVariable (
     // not delete the variable.

     //

     if ((((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) && (DataSize == 0))|| ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0)) {

+      if (Variable->InDeletedTransitionPtr != NULL) {

+        //

+        // Both ADDED and IN_DELETED_TRANSITION variable are present,

+        // set IN_DELETED_TRANSITION one to DELETED state first.

+        //

+        State = Variable->InDeletedTransitionPtr->State;

+        State &= VAR_DELETED;

+        Status = UpdateVariableStore (

+                   &mVariableModuleGlobal->VariableGlobal,

+                   Variable->Volatile,

+                   FALSE,

+                   Fvb,

+                   (UINTN) &Variable->InDeletedTransitionPtr->State,

+                   sizeof (UINT8),

+                   &State

+                   );

+        if (!EFI_ERROR (Status)) {

+          if (!Variable->Volatile) {

+            CacheVariable->InDeletedTransitionPtr->State = State;

+          }

+        } else {

+          goto Done;

+        }

+      }

+

       State = Variable->CurrPtr->State;

       State &= VAR_DELETED;

 

@@ -1959,7 +1999,7 @@ UpdateVariable (
                  mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,

                  &mVariableModuleGlobal->NonVolatileLastVariableOffset,

                  FALSE,

-                 Variable->CurrPtr,

+                 Variable,

                  FALSE,

                  FALSE

                  );

@@ -1976,7 +2016,10 @@ UpdateVariable (
         Status = EFI_OUT_OF_RESOURCES;

         goto Done;

       }

-      Reclaimed = TRUE;

+      if (Variable->CurrPtr != NULL) {

+        CacheVariable->CurrPtr = (VARIABLE_HEADER *)((UINTN) CacheVariable->StartPtr + ((UINTN) Variable->CurrPtr - (UINTN) Variable->StartPtr));

+        CacheVariable->InDeletedTransitionPtr = NULL;

+      }

     }

     //

     // Four steps

@@ -2080,7 +2123,7 @@ UpdateVariable (
                  mVariableModuleGlobal->VariableGlobal.VolatileVariableBase,

                  &mVariableModuleGlobal->VolatileLastVariableOffset,

                  TRUE,

-                 Variable->CurrPtr,

+                 Variable,

                  FALSE,

                  FALSE

                  );

@@ -2096,7 +2139,10 @@ UpdateVariable (
         Status = EFI_OUT_OF_RESOURCES;

         goto Done;

       }

-      Reclaimed = TRUE;

+      if (Variable->CurrPtr != NULL) {

+        CacheVariable->CurrPtr = (VARIABLE_HEADER *)((UINTN) CacheVariable->StartPtr + ((UINTN) Variable->CurrPtr - (UINTN) Variable->StartPtr));

+        CacheVariable->InDeletedTransitionPtr = NULL;

+      }

     }

 

     NextVariable->State = VAR_ADDED;

@@ -2120,7 +2166,32 @@ UpdateVariable (
   //

   // Mark the old variable as deleted.

   //

-  if (!Reclaimed && !EFI_ERROR (Status) && Variable->CurrPtr != NULL) {

+  if (!EFI_ERROR (Status) && Variable->CurrPtr != NULL) {

+    if (Variable->InDeletedTransitionPtr != NULL) {

+      //

+      // Both ADDED and IN_DELETED_TRANSITION old variable are present,

+      // set IN_DELETED_TRANSITION one to DELETED state first.

+      //

+      State = Variable->InDeletedTransitionPtr->State;

+      State &= VAR_DELETED;

+      Status = UpdateVariableStore (

+                 &mVariableModuleGlobal->VariableGlobal,

+                 Variable->Volatile,

+                 FALSE,

+                 Fvb,

+                 (UINTN) &Variable->InDeletedTransitionPtr->State,

+                 sizeof (UINT8),

+                 &State

+                 );

+      if (!EFI_ERROR (Status)) {

+        if (!Variable->Volatile) {

+          CacheVariable->InDeletedTransitionPtr->State = State;

+        }

+      } else {

+        goto Done;

+      }

+    }

+

     State = Variable->CurrPtr->State;

     State &= VAR_DELETED;

 

@@ -2342,6 +2413,7 @@ VariableServiceGetNextVariableName (
   VARIABLE_STORE_TYPE     Type;

   VARIABLE_POINTER_TRACK  Variable;

   VARIABLE_POINTER_TRACK  VariableInHob;

+  VARIABLE_POINTER_TRACK  VariablePtrTrack;

   UINTN                   VarNameSize;

   EFI_STATUS              Status;

   VARIABLE_STORE_HEADER   *VariableStoreHeader[VariableStoreTypeMax];

@@ -2415,8 +2487,27 @@ VariableServiceGetNextVariableName (
     //

     // Variable is found

     //

-    if (Variable.CurrPtr->State == VAR_ADDED) {

-      if ((AtRuntime () && ((Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) == 0) {

+    if (Variable.CurrPtr->State == VAR_ADDED || Variable.CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {

+      if (!AtRuntime () || ((Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) != 0)) {

+        if (Variable.CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {

+          //

+          // If it is a IN_DELETED_TRANSITION variable,

+          // and there is also a same ADDED one at the same time,

+          // don't return it.

+          //

+          VariablePtrTrack.StartPtr = Variable.StartPtr;

+          VariablePtrTrack.EndPtr = Variable.EndPtr;

+          Status = FindVariableEx (

+                     GetVariableNamePtr (Variable.CurrPtr),

+                     &Variable.CurrPtr->VendorGuid,

+                     FALSE,

+                     &VariablePtrTrack

+                     );

+          if (!EFI_ERROR (Status) && VariablePtrTrack.CurrPtr->State == VAR_ADDED) {

+            Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);

+            continue;

+          }

+        }

 

         //

         // Don't return NV variable when HOB overrides it

diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.h b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.h
index 427245abc..8e292f36b 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.h
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.h
@@ -65,6 +65,13 @@ typedef enum {
 

 typedef struct {

   VARIABLE_HEADER *CurrPtr;

+  //

+  // If both ADDED and IN_DELETED_TRANSITION variable are present,

+  // InDeletedTransitionPtr will point to the IN_DELETED_TRANSITION one.

+  // Otherwise, CurrPtr will point to the ADDED or IN_DELETED_TRANSITION one,

+  // and InDeletedTransitionPtr will be NULL at the same time.

+  //

+  VARIABLE_HEADER *InDeletedTransitionPtr;

   VARIABLE_HEADER *EndPtr;

   VARIABLE_HEADER *StartPtr;

   BOOLEAN         Volatile;

@@ -209,7 +216,7 @@ DataSizeOfVariable (
   @param[in] Attributes         Attributes of the variable.

   @param[in] KeyIndex           Index of associated public key.

   @param[in] MonotonicCount     Value of associated monotonic count.

-  @param[in] Variable           The variable information that is used to keep track of variable usage.

+  @param[in, out] Variable      The variable information that is used to keep track of variable usage.

 

   @param[in] TimeStamp          Value of associated TimeStamp.

 

@@ -226,7 +233,7 @@ UpdateVariable (
   IN      UINT32          Attributes OPTIONAL,

   IN      UINT32          KeyIndex  OPTIONAL,

   IN      UINT64          MonotonicCount  OPTIONAL,

-  IN      VARIABLE_POINTER_TRACK *Variable,

+  IN OUT  VARIABLE_POINTER_TRACK *Variable,

   IN      EFI_TIME        *TimeStamp  OPTIONAL  

   );

 

@@ -378,7 +385,7 @@ VariableCommonInitialize (
   @param[out]  LastVariableOffset      Offset of last variable.

   @param[in]   IsVolatile              The variable store is volatile or not;

                                        if it is non-volatile, need FTW.

-  @param[in]   UpdatingVariable        Pointer to updating variable.

+  @param[in, out] UpdatingPtrTrack     Pointer to updating variable pointer track structure.

   @param[in]   ReclaimPubKeyStore      Reclaim for public key database or not.

   @param[in]   ReclaimAnyway           If TRUE, do reclaim anyway.

   

@@ -392,7 +399,7 @@ Reclaim (
   IN  EFI_PHYSICAL_ADDRESS  VariableBase,

   OUT UINTN                 *LastVariableOffset,

   IN  BOOLEAN               IsVolatile,

-  IN  VARIABLE_HEADER       *UpdatingVariable,

+  IN OUT VARIABLE_POINTER_TRACK *UpdatingPtrTrack,

   IN  BOOLEAN               ReclaimPubKeyStore,

   IN  BOOLEAN               ReclaimAnyway

   );