Use SmmMemLib to check communication buffer.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Gao, Liming" <liming.gao@intel.com>
Reviewed-by: "Fan, Jeff" <jeff.fan@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16695 6f19259b-4bc3-4df7-8a09-765794883524

2 files changed, 4 insertions, 83 deletions

diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
index 439a4fe20d..8c80a0064f 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.c
@@ -33,14 +33,12 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Protocol/SmmVarCheck.h>

 

 #include <Library/SmmServicesTableLib.h>

+#include <Library/SmmMemLib.h>

 

 #include <Guid/AuthenticatedVariableFormat.h>

 #include <Guid/SmmVariableCommon.h>

 #include "Variable.h"

 

-EFI_SMRAM_DESCRIPTOR                                 *mSmramRanges;

-UINTN                                                mSmramRangeCount;

-

 extern VARIABLE_INFO_ENTRY                           *gVariableInfo;

 EFI_HANDLE                                           mSmmVariableHandle      = NULL;

 EFI_HANDLE                                           mVariableHandle         = NULL;

@@ -138,60 +136,6 @@ AtRuntime (
 }

 

 /**

-  This function check if the address is in SMRAM.

-

-  @param Buffer  the buffer address to be checked.

-  @param Length  the buffer length to be checked.

-

-  @retval TRUE  this address is in SMRAM.

-  @retval FALSE this address is NOT in SMRAM.

-**/

-BOOLEAN

-InternalIsAddressInSmram (

-  IN EFI_PHYSICAL_ADDRESS  Buffer,

-  IN UINT64                Length

-  )

-{

-  UINTN  Index;

-

-  for (Index = 0; Index < mSmramRangeCount; Index ++) {

-    if (((Buffer >= mSmramRanges[Index].CpuStart) && (Buffer < mSmramRanges[Index].CpuStart + mSmramRanges[Index].PhysicalSize)) ||

-        ((mSmramRanges[Index].CpuStart >= Buffer) && (mSmramRanges[Index].CpuStart < Buffer + Length))) {

-      return TRUE;

-    }

-  }

-

-  return FALSE;

-}

-

-/**

-  This function check if the address refered by Buffer and Length is valid.

-

-  @param Buffer  the buffer address to be checked.

-  @param Length  the buffer length to be checked.

-

-  @retval TRUE  this address is valid.

-  @retval FALSE this address is NOT valid.

-**/

-BOOLEAN

-InternalIsAddressValid (

-  IN UINTN                 Buffer,

-  IN UINTN                 Length

-  )

-{

-  if (Buffer > (MAX_ADDRESS - Length)) {

-    //

-    // Overflow happen

-    //

-    return FALSE;

-  }

-  if (InternalIsAddressInSmram ((EFI_PHYSICAL_ADDRESS)Buffer, (UINT64)Length)) {

-    return FALSE;

-  }

-  return TRUE;

-}

-

-/**

   Initializes a basic mutual exclusion lock.

 

   This function initializes a basic mutual exclusion lock to the released state 

@@ -550,7 +494,7 @@ SmmVariableHandler (
     return EFI_SUCCESS;

   }

 

-  if (!InternalIsAddressValid ((UINTN)CommBuffer, TempCommBufferSize)) {

+  if (!SmmIsBufferOutsideSmmValid ((UINTN)CommBuffer, TempCommBufferSize)) {

     DEBUG ((EFI_D_ERROR, "SmmVariableHandler: SMM communication buffer in SMRAM or overflow!\n"));

     return EFI_SUCCESS;

   }

@@ -742,7 +686,7 @@ SmmVariableHandler (
       // It is covered by previous CommBuffer check 

       //

      

-      if (InternalIsAddressInSmram ((EFI_PHYSICAL_ADDRESS)(UINTN)CommBufferSize, sizeof(UINTN))) {

+      if (!SmmIsBufferOutsideSmmValid ((EFI_PHYSICAL_ADDRESS)(UINTN)CommBufferSize, sizeof(UINTN))) {

         DEBUG ((EFI_D_ERROR, "GetStatistics: SMM communication buffer in SMRAM!\n"));

         Status = EFI_ACCESS_DENIED;

         goto EXIT;

@@ -961,8 +905,6 @@ VariableServiceInitialize (
   EFI_STATUS                              Status;

   EFI_HANDLE                              VariableHandle;

   VOID                                    *SmmFtwRegistration;

-  EFI_SMM_ACCESS2_PROTOCOL                *SmmAccess;

-  UINTN                                   Size;

   VOID                                    *SmmEndOfDxeRegistration;

 

   //

@@ -991,28 +933,6 @@ VariableServiceInitialize (
                     );

   ASSERT_EFI_ERROR (Status);

 

-  //

-  // Get SMRAM information

-  //

-  Status = gBS->LocateProtocol (&gEfiSmmAccess2ProtocolGuid, NULL, (VOID **)&SmmAccess);

-  ASSERT_EFI_ERROR (Status);

-

-  Size = 0;

-  Status = SmmAccess->GetCapabilities (SmmAccess, &Size, NULL);

-  ASSERT (Status == EFI_BUFFER_TOO_SMALL);

-

-  Status = gSmst->SmmAllocatePool (

-                    EfiRuntimeServicesData,

-                    Size,

-                    (VOID **)&mSmramRanges

-                    );

-  ASSERT_EFI_ERROR (Status);

-

-  Status = SmmAccess->GetCapabilities (SmmAccess, &Size, mSmramRanges);

-  ASSERT_EFI_ERROR (Status);

-

-  mSmramRangeCount = Size / sizeof (EFI_SMRAM_DESCRIPTOR);

-

   mVariableBufferPayloadSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize)) +

                                OFFSET_OF (SMM_VARIABLE_COMMUNICATE_VAR_CHECK_VARIABLE_PROPERTY, Name) - sizeof (VARIABLE_HEADER);

 

diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.inf b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.inf
index 317f13c2a4..d415bdef42 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.inf
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmm.inf
@@ -75,6 +75,7 @@
   HobLib

   PcdLib

   DevicePathLib

+  SmmMemLib

 

 [Protocols]

   gEfiSmmFirmwareVolumeBlockProtocolGuid        ## CONSUMES