diff options
| author | ydong10 <ydong10@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-05-18 02:24:25 +0000 |
|---|---|---|
| committer | ydong10 <ydong10@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-05-18 02:24:25 +0000 |
| commit | a95b6045c32b8ea2c564c6848f00d785056dd56f (patch) | |
| tree | b85e04cfd3c7a58589f12382dd214687b8ca1a14 /MdeModulePkg | |
| parent | 7ea22852094257713c3d7f31f1c02b0433c2729f (diff) | |
Add logic to validate variable before use it.
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Jiewen Yao <jiewen,yao@intel.com>
Reviewed-by: Michael D. Kinney <michael.d.kinney@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13323 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg')
| -rw-r--r-- | MdeModulePkg/Core/DxeIplPeim/DxeLoad.c | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/MdeModulePkg/Core/DxeIplPeim/DxeLoad.c b/MdeModulePkg/Core/DxeIplPeim/DxeLoad.c index d0baf2eb9..dea627e16 100644 --- a/MdeModulePkg/Core/DxeIplPeim/DxeLoad.c +++ b/MdeModulePkg/Core/DxeIplPeim/DxeLoad.c @@ -125,6 +125,53 @@ PeimInitializeDxeIpl ( }
/**
+ Validate variable data for the MemoryTypeInformation.
+
+ @param MemoryData Variable data.
+ @param MemoryDataSize Variable data length.
+
+ @return TRUE The variable data is valid.
+ @return FALSE The variable data is invalid.
+
+**/
+BOOLEAN
+ValidateMemoryTypeInfoVariable (
+ IN EFI_MEMORY_TYPE_INFORMATION *MemoryData,
+ IN UINTN MemoryDataSize
+ )
+{
+ UINTN Count;
+ UINTN Index;
+
+ // Check the input parameter.
+ if (MemoryData == NULL) {
+ return FALSE;
+ }
+
+ // Get Count
+ Count = MemoryDataSize / sizeof (*MemoryData);
+
+ // Check Size
+ if (Count * sizeof(*MemoryData) != MemoryDataSize) {
+ return FALSE;
+ }
+
+ // Check last entry type filed.
+ if (MemoryData[Count - 1].Type != EfiMaxMemoryType) {
+ return FALSE;
+ }
+
+ // Check the type filed.
+ for (Index = 0; Index < Count - 1; Index++) {
+ if (MemoryData[Index].Type >= EfiMaxMemoryType) {
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/**
Main entry point to last PEIM.
This function finds DXE Core in the firmware volume and transfer the control to
@@ -214,7 +261,7 @@ DxeLoadCore ( &DataSize,
&MemoryData
);
- if (!EFI_ERROR (Status)) {
+ if (!EFI_ERROR (Status) && ValidateMemoryTypeInfoVariable(MemoryData, DataSize)) {
//
// Build the GUID'd HOB for DXE
//
|