Move the memory allocation and variable set to BdsEntry, use VariableLock protocol to lock the L”PerfDataMemAddr” variable and prevent malware to update it.

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@14386 6f19259b-4bc3-4df7-8a09-765794883524

3 files changed, 21 insertions, 56 deletions

diff --git a/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c b/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c
index c04c586f50..06ba0fcf79 100644
--- a/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c
+++ b/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsBoot.c
@@ -1,7 +1,7 @@
 /** @file

   BDS Lib functions which relate with create or process the boot option.

 

-Copyright (c) 2004 - 2012, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2004 - 2013, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -2229,10 +2229,6 @@ BdsLibBootViaBootOption (
   LIST_ENTRY                TempBootLists;

   EFI_BOOT_LOGO_PROTOCOL    *BootLogo;

 

-  PERF_CODE (

-    AllocateMemoryForPerformanceData ();

-  );

-

   *ExitDataSize = 0;

   *ExitData     = NULL;

 

diff --git a/IntelFrameworkModulePkg/Library/GenericBdsLib/InternalBdsLib.h b/IntelFrameworkModulePkg/Library/GenericBdsLib/InternalBdsLib.h
index 5d51635bf1..1384febc98 100644
--- a/IntelFrameworkModulePkg/Library/GenericBdsLib/InternalBdsLib.h
+++ b/IntelFrameworkModulePkg/Library/GenericBdsLib/InternalBdsLib.h
@@ -87,16 +87,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 

 /**

 

-  Allocates a block of memory to store performance data.

-

-**/

-VOID

-AllocateMemoryForPerformanceData (

-  VOID

-  );

-

-/**

-

   Writes performance data of booting into the allocated memory.

   OS can process these records.

 

diff --git a/IntelFrameworkModulePkg/Library/GenericBdsLib/Performance.c b/IntelFrameworkModulePkg/Library/GenericBdsLib/Performance.c
index 7e6d358d84..047d2a7dbc 100644
--- a/IntelFrameworkModulePkg/Library/GenericBdsLib/Performance.c
+++ b/IntelFrameworkModulePkg/Library/GenericBdsLib/Performance.c
@@ -3,7 +3,7 @@
   performance, all the function will only include if the performance

   switch is set.

 

-Copyright (c) 2004 - 2012, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2004 - 2013, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -19,7 +19,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 PERF_HEADER               mPerfHeader;

 PERF_DATA                 mPerfData;

 EFI_PHYSICAL_ADDRESS      mAcpiLowMemoryBase = 0x0FFFFFFFFULL;

-UINT32                    mAcpiLowMemoryLength = 0x4000;

 

 /**

   Get the short verion of PDB file name to be

@@ -136,40 +135,6 @@ GetNameFromHandle (
 

 /**

 

-  Allocates a block of memory to store performance data.

-

-**/

-VOID

-AllocateMemoryForPerformanceData (

-  VOID

-  )

-{

-  EFI_STATUS    Status;

-

-  if (mAcpiLowMemoryBase == 0x0FFFFFFFF) {

-    //

-    // Allocate a block of memory that contain performance data to OS

-    //

-    Status = gBS->AllocatePages (

-                    AllocateMaxAddress,

-                    EfiReservedMemoryType,

-                    EFI_SIZE_TO_PAGES (mAcpiLowMemoryLength),

-                    &mAcpiLowMemoryBase

-                    );

-    if (!EFI_ERROR (Status)) {

-      gRT->SetVariable (

-             L"PerfDataMemAddr",

-             &gPerformanceProtocolGuid,

-             EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,

-             sizeof (EFI_PHYSICAL_ADDRESS),

-             &mAcpiLowMemoryBase

-             );

-    }

-  }

-}

-

-/**

-

   Writes performance data of booting into the allocated memory.

   OS can process these records.

 

@@ -209,16 +174,13 @@ WriteBootToOsPerformanceData (
   // List of flags indicating PerfEntry contains DXE handle

   //

   BOOLEAN                   *PerfEntriesAsDxeHandle;

+  UINTN                     VarSize;

 

   //

   // Record the performance data for End of BDS

   //

   PERF_END(NULL, "BDS", NULL, 0);

 

-  if (mAcpiLowMemoryBase == 0x0FFFFFFFF) {

-    return;

-  }

-

   //

   // Retrieve time stamp count as early as possible

   //

@@ -241,6 +203,23 @@ WriteBootToOsPerformanceData (
     CountUp            = FALSE;

   }

 

+  if (mAcpiLowMemoryBase == 0x0FFFFFFFF) {

+    VarSize = sizeof (EFI_PHYSICAL_ADDRESS);

+    Status = gRT->GetVariable (

+                    L"PerfDataMemAddr",

+                    &gPerformanceProtocolGuid,

+                    NULL,

+                    &VarSize,

+                    &mAcpiLowMemoryBase

+                    );

+    if (EFI_ERROR (Status)) {

+      //

+      // Fail to get the variable, return.

+      //

+      return;

+    }

+  }

+

   //

   // Put Detailed performance data into memory

   //

@@ -257,7 +236,7 @@ WriteBootToOsPerformanceData (
   }

 

   Ptr        = (UINT8 *) ((UINT32) mAcpiLowMemoryBase + sizeof (PERF_HEADER));

-  LimitCount = (mAcpiLowMemoryLength - sizeof (PERF_HEADER)) / sizeof (PERF_DATA);

+  LimitCount = (UINT32) (PERF_DATA_MAX_LENGTH - sizeof (PERF_HEADER)) / sizeof (PERF_DATA);

 

   NumPerfEntries = 0;

   LogEntryKey    = 0;