[edk2-devel] [PATCH 5/5] StandaloneMmPkg/StandaloneMmCoreEntryPoint: relocate StMM core on the fly
Ard Biesheuvel
ard.biesheuvel at arm.com
Wed Jun 10 08:17:40 UTC 2020
Apply PE/COFF fixups when starting up the standalone MM core, so that
it can execute at any address regardless of the link time address.
Note that this requires the PE/COFF image to be emitted with its
relocation section preserved. Special care is taken to ensure that
TE images are dealt with correctly as well.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel at arm.com>
---
StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h | 2 ++
StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c | 11 +++++++---
StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c | 22 ++++++++++++++++++++
3 files changed, 32 insertions(+), 3 deletions(-)
diff --git a/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h b/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h
index 494bcf3dc28f..a3420699e6f1 100644
--- a/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h
+++ b/StandaloneMmPkg/Include/Library/AArch64/StandaloneMmCoreEntryPoint.h
@@ -82,6 +82,7 @@ EFI_STATUS
EFIAPI
UpdateMmFoundationPeCoffPermissions (
IN CONST PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
+ IN EFI_PHYSICAL_ADDRESS ImageBase,
IN UINT32 SectionHeaderOffset,
IN CONST UINT16 NumberOfSections,
IN REGION_PERMISSION_UPDATE_FUNC TextUpdater,
@@ -107,6 +108,7 @@ EFIAPI
GetStandaloneMmCorePeCoffSections (
IN VOID *TeData,
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
+ OUT EFI_PHYSICAL_ADDRESS *ImageBase,
IN OUT UINT32 *SectionHeaderOffset,
IN OUT UINT16 *NumberOfSections
);
diff --git a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c
index 00f49c9d0558..bf9650d54629 100644
--- a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c
+++ b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c
@@ -29,6 +29,7 @@ EFI_STATUS
EFIAPI
UpdateMmFoundationPeCoffPermissions (
IN CONST PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
+ IN EFI_PHYSICAL_ADDRESS ImageBase,
IN UINT32 SectionHeaderOffset,
IN CONST UINT16 NumberOfSections,
IN REGION_PERMISSION_UPDATE_FUNC TextUpdater,
@@ -87,7 +88,7 @@ UpdateMmFoundationPeCoffPermissions (
// if it is a writeable section then mark it appropriately as well.
//
if ((SectionHeader.Characteristics & EFI_IMAGE_SCN_MEM_EXECUTE) == 0) {
- Base = ImageContext->ImageAddress + SectionHeader.VirtualAddress;
+ Base = ImageBase + SectionHeader.VirtualAddress;
TextUpdater (Base, SectionHeader.Misc.VirtualSize);
@@ -153,6 +154,7 @@ STATIC
EFI_STATUS
GetPeCoffSectionInformation (
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
+ OUT EFI_PHYSICAL_ADDRESS *ImageBase,
OUT UINT32 *SectionHeaderOffset,
OUT UINT16 *NumberOfSections
)
@@ -212,6 +214,7 @@ GetPeCoffSectionInformation (
return Status;
}
+ *ImageBase = ImageContext->ImageAddress;
if (!ImageContext->IsTeImage) {
ASSERT (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE);
@@ -232,7 +235,7 @@ GetPeCoffSectionInformation (
} else {
*SectionHeaderOffset = (UINTN)(sizeof (EFI_TE_IMAGE_HEADER));
*NumberOfSections = Hdr.Te->NumberOfSections;
- ImageContext->ImageAddress -= (UINT32)Hdr.Te->StrippedSize - sizeof (EFI_TE_IMAGE_HEADER);
+ *ImageBase -= (UINT32)Hdr.Te->StrippedSize - sizeof (EFI_TE_IMAGE_HEADER);
}
return RETURN_SUCCESS;
}
@@ -242,6 +245,7 @@ EFIAPI
GetStandaloneMmCorePeCoffSections (
IN VOID *TeData,
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
+ OUT EFI_PHYSICAL_ADDRESS *ImageBase,
IN OUT UINT32 *SectionHeaderOffset,
IN OUT UINT16 *NumberOfSections
)
@@ -255,7 +259,8 @@ GetStandaloneMmCorePeCoffSections (
DEBUG ((DEBUG_INFO, "Found Standalone MM PE data - 0x%x\n", TeData));
- Status = GetPeCoffSectionInformation (ImageContext, SectionHeaderOffset, NumberOfSections);
+ Status = GetPeCoffSectionInformation (ImageContext, ImageBase,
+ SectionHeaderOffset, NumberOfSections);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Unable to locate Standalone MM Core PE-COFF Section information - %r\n", Status));
return Status;
diff --git a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c
index 20723385113f..9cecfa667b90 100644
--- a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c
+++ b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c
@@ -225,6 +225,7 @@ _ModuleEntryPoint (
VOID *HobStart;
VOID *TeData;
UINTN TeDataSize;
+ EFI_PHYSICAL_ADDRESS ImageBase;
// Get Secure Partition Manager Version Information
Status = GetSpmVersion ();
@@ -253,6 +254,7 @@ _ModuleEntryPoint (
Status = GetStandaloneMmCorePeCoffSections (
TeData,
&ImageContext,
+ &ImageBase,
&SectionHeaderOffset,
&NumberOfSections
);
@@ -261,10 +263,21 @@ _ModuleEntryPoint (
goto finish;
}
+ //
+ // ImageBase may deviate from ImageContext.ImageAddress if we are dealing
+ // with a TE image, in which case the latter points to the actual offset
+ // of the image, whereas ImageBase refers to the address where the image
+ // would start if the stripped PE headers were still in place. In either
+ // case, we need to fix up ImageBase so it refers to the actual current
+ // load address.
+ //
+ ImageBase += (UINTN)TeData - ImageContext.ImageAddress;
+
// Update the memory access permissions of individual sections in the
// Standalone MM core module
Status = UpdateMmFoundationPeCoffPermissions (
&ImageContext,
+ ImageBase,
SectionHeaderOffset,
NumberOfSections,
ArmSetMemoryRegionNoExec,
@@ -276,6 +289,15 @@ _ModuleEntryPoint (
goto finish;
}
+ if (ImageContext.ImageAddress != (UINTN)TeData) {
+ ImageContext.ImageAddress = (UINTN)TeData;
+ ArmSetMemoryRegionNoExec (ImageBase, SIZE_4KB);
+ ArmClearMemoryRegionReadOnly (ImageBase, SIZE_4KB);
+
+ Status = PeCoffLoaderRelocateImage (&ImageContext);
+ ASSERT_EFI_ERROR (Status);
+ }
+
//
// Create Hoblist based upon boot information passed by privileged software
//
--
2.26.2
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