diff options
| author | Liming Gao <liming.gao@intel.com> | 2016-07-13 20:28:15 +0800 |
|---|---|---|
| committer | Liming Gao <liming.gao@intel.com> | 2016-07-14 15:04:53 +0800 |
| commit | 5e9dfc67821b75ab606d8565f0bc1133bbc2a92c (patch) | |
| tree | a4f73371fb4eb8608d221e9ab407e8f19e750a25 /SecurityPkg/VariableAuthenticated | |
| parent | 04147690b59bba6900e175c7d06e3fe48570ab73 (diff) | |
| download | edk2-5e9dfc67821b75ab606d8565f0bc1133bbc2a92c.tar.gz | |
SecurityPkg SecureBootConfigDxe: Add check for the external PE/COFF image.
Use BasePeCoffLib PeCoffLoaderGetImageInfo() to check the PE/COFF image.
In V2, add specific ImageRead() to make sure the PE/COFF image content
read is within the image buffer.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>
Diffstat (limited to 'SecurityPkg/VariableAuthenticated')
3 files changed, 72 insertions, 0 deletions
diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf index 6b143f5e01..fa7c39d6e5 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigDxe.inf @@ -58,6 +58,7 @@ PlatformSecureLib
DevicePathLib
FileExplorerLib
+ PeCoffLib
[Guids]
## SOMETIMES_CONSUMES ## Variable:L"CustomMode"
diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c index 3f80441602..0d9618597b 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c @@ -1610,6 +1610,54 @@ ON_EXIT: }
/**
+ Reads contents of a PE/COFF image in memory buffer.
+
+ Caution: This function may receive untrusted input.
+ PE/COFF image is external input, so this function will make sure the PE/COFF image content
+ read is within the image buffer.
+
+ @param FileHandle Pointer to the file handle to read the PE/COFF image.
+ @param FileOffset Offset into the PE/COFF image to begin the read operation.
+ @param ReadSize On input, the size in bytes of the requested read operation.
+ On output, the number of bytes actually read.
+ @param Buffer Output buffer that contains the data read from the PE/COFF image.
+
+ @retval EFI_SUCCESS The specified portion of the PE/COFF image was read and the size
+**/
+EFI_STATUS
+EFIAPI
+SecureBootConfigImageRead (
+ IN VOID *FileHandle,
+ IN UINTN FileOffset,
+ IN OUT UINTN *ReadSize,
+ OUT VOID *Buffer
+ )
+{
+ UINTN EndPosition;
+
+ if (FileHandle == NULL || ReadSize == NULL || Buffer == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (MAX_ADDRESS - FileOffset < *ReadSize) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ EndPosition = FileOffset + *ReadSize;
+ if (EndPosition > mImageSize) {
+ *ReadSize = (UINT32)(mImageSize - FileOffset);
+ }
+
+ if (FileOffset >= mImageSize) {
+ *ReadSize = 0;
+ }
+
+ CopyMem (Buffer, (UINT8 *)((UINTN) FileHandle + FileOffset), *ReadSize);
+
+ return EFI_SUCCESS;
+}
+
+/**
Load PE/COFF image information into internal buffer and check its validity.
@retval EFI_SUCCESS Successful
@@ -1625,9 +1673,28 @@ LoadPeImage ( EFI_IMAGE_DOS_HEADER *DosHdr;
EFI_IMAGE_NT_HEADERS32 *NtHeader32;
EFI_IMAGE_NT_HEADERS64 *NtHeader64;
+ PE_COFF_LOADER_IMAGE_CONTEXT ImageContext;
+ EFI_STATUS Status;
NtHeader32 = NULL;
NtHeader64 = NULL;
+
+ ZeroMem (&ImageContext, sizeof (ImageContext));
+ ImageContext.Handle = (VOID *) mImageBase;
+ ImageContext.ImageRead = (PE_COFF_LOADER_READ_FILE) SecureBootConfigImageRead;
+
+ //
+ // Get information about the image being loaded
+ //
+ Status = PeCoffLoaderGetImageInfo (&ImageContext);
+ if (EFI_ERROR (Status)) {
+ //
+ // The information can't be got from the invalid PeImage
+ //
+ DEBUG ((DEBUG_INFO, "SecureBootConfigDxe: PeImage invalid. \n"));
+ return Status;
+ }
+
//
// Read the Dos header
//
@@ -1689,6 +1756,9 @@ LoadPeImage ( Calculate hash of Pe/Coff image based on the authenticode image hashing in
PE/COFF Specification 8.0 Appendix A
+ Notes: PE/COFF image has been checked by BasePeCoffLib PeCoffLoaderGetImageInfo() in
+ the function LoadPeImage ().
+
@param[in] HashAlg Hash algorithm type.
@retval TRUE Successfully hash image.
diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h index 0a09ab4966..5055a9e9c3 100644 --- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h +++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h @@ -40,6 +40,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include <Library/PlatformSecureLib.h>
#include <Library/BaseCryptLib.h>
#include <Library/FileExplorerLib.h>
+#include <Library/PeCoffLib.h>
#include <Guid/MdeModuleHii.h>
#include <Guid/AuthenticatedVariableFormat.h>
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