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BasePeCoff.c
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BasePeCoff.c
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/** @file
Base PE/COFF loader supports loading any PE32/PE32+ or TE image, but
only supports relocating IA32, x64, IPF, ARM, RISC-V, LoongArch and EBC images.
Caution: This file requires additional review when modified.
This library will have external input - PE/COFF image.
This external input must be validated carefully to avoid security issue like
buffer overflow, integer overflow.
The basic guideline is that caller need provide ImageContext->ImageRead () with the
necessary data range check, to make sure when this library reads PE/COFF image, the
PE image buffer is always in valid range.
This library will also do some additional check for PE header fields.
PeCoffLoaderGetPeHeader() routine will do basic check for PE/COFF header.
PeCoffLoaderGetImageInfo() routine will do basic check for whole PE/COFF image.
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Portions Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
Portions Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "BasePeCoffLibInternals.h"
/**
Adjust some fields in section header for TE image.
@param SectionHeader Pointer to the section header.
@param TeStrippedOffset Size adjust for the TE image.
**/
VOID
PeCoffLoaderAdjustOffsetForTeImage (
EFI_IMAGE_SECTION_HEADER *SectionHeader,
UINT32 TeStrippedOffset
)
{
SectionHeader->VirtualAddress -= TeStrippedOffset;
SectionHeader->PointerToRawData -= TeStrippedOffset;
}
// MU_CHANGE [BEGIN] - Keep this function while it's used for the stack cookies.
/**
Retrieves the magic value from the PE/COFF header.
@param Hdr The buffer in which to return the PE32, PE32+, or TE header.
@return EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC - Image is PE32
@return EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC - Image is PE32+
**/
UINT16
PeCoffLoaderGetPeHeaderMagicValue (
IN EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr
)
{
//
// NOTE: Some versions of Linux ELILO for Itanium have an incorrect magic value
// in the PE/COFF Header. If the MachineType is Itanium(IA64) and the
// Magic value in the OptionalHeader is EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC
// then override the returned value to EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC
//
if ((Hdr.Pe32->FileHeader.Machine == IMAGE_FILE_MACHINE_IA64) && (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC)) {
return EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;
}
//
// Return the magic value from the PC/COFF Optional Header
//
return Hdr.Pe32->OptionalHeader.Magic;
}
// MU_CHANGE [END] - Keep this function while it's used for the stack cookies.
/**
Retrieves the PE or TE Header from a PE/COFF or TE image.
Caution: This function may receive untrusted input.
PE/COFF image is external input, so this routine will
also done many checks in PE image to make sure PE image DosHeader, PeOptionHeader,
SizeOfHeader, Section Data Region and Security Data Region be in PE image range.
@param ImageContext The context of the image being loaded.
@param Hdr The buffer in which to return the PE32, PE32+, or TE header.
@retval RETURN_SUCCESS The PE or TE Header is read.
@retval Other The error status from reading the PE/COFF or TE image using the ImageRead function.
**/
RETURN_STATUS
PeCoffLoaderGetPeHeader (
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
OUT EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr
)
{
RETURN_STATUS Status;
EFI_IMAGE_DOS_HEADER DosHdr;
UINTN Size;
UINTN ReadSize;
UINT32 SectionHeaderOffset;
UINT32 Index;
UINT32 HeaderWithoutDataDir;
CHAR8 BufferData;
UINTN NumberOfSections;
EFI_IMAGE_SECTION_HEADER SectionHeader;
//
// Read the DOS image header to check for its existence
//
Size = sizeof (EFI_IMAGE_DOS_HEADER);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
0,
&Size,
&DosHdr
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
ImageContext->PeCoffHeaderOffset = 0;
if (DosHdr.e_magic == EFI_IMAGE_DOS_SIGNATURE) {
//
// DOS image header is present, so read the PE header after the DOS image
// header
//
ImageContext->PeCoffHeaderOffset = DosHdr.e_lfanew;
}
//
// Read the PE/COFF Header. For PE32 (32-bit) this will read in too much
// data, but that should not hurt anything. Hdr.Pe32->OptionalHeader.Magic
// determines if this is a PE32 or PE32+ image. The magic is in the same
// location in both images.
//
Size = sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
ImageContext->PeCoffHeaderOffset,
&Size,
Hdr.Pe32
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
//
// Use Signature to figure out if we understand the image format
//
if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE) {
ImageContext->IsTeImage = TRUE;
ImageContext->Machine = Hdr.Te->Machine;
ImageContext->ImageType = (UINT16)(Hdr.Te->Subsystem);
//
// For TeImage, SectionAlignment is undefined to be set to Zero
// ImageSize can be calculated.
//
ImageContext->ImageSize = 0;
ImageContext->SectionAlignment = 0;
ImageContext->SizeOfHeaders = sizeof (EFI_TE_IMAGE_HEADER) + (UINTN)Hdr.Te->BaseOfCode - (UINTN)Hdr.Te->StrippedSize;
//
// Check the StrippedSize.
//
if (sizeof (EFI_TE_IMAGE_HEADER) >= (UINT32)Hdr.Te->StrippedSize) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// Check the SizeOfHeaders field.
//
if (Hdr.Te->BaseOfCode <= Hdr.Te->StrippedSize) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// Read last byte of Hdr.Te->SizeOfHeaders from the file.
//
Size = 1;
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
ImageContext->SizeOfHeaders - 1,
&Size,
&BufferData
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
//
// TE Image Data Directory Entry size is non-zero, but the Data Directory Virtual Address is zero.
// This case is not a valid TE image.
//
if (((Hdr.Te->DataDirectory[0].Size != 0) && (Hdr.Te->DataDirectory[0].VirtualAddress == 0)) ||
((Hdr.Te->DataDirectory[1].Size != 0) && (Hdr.Te->DataDirectory[1].VirtualAddress == 0)))
{
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
} else if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE) {
ImageContext->IsTeImage = FALSE;
ImageContext->Machine = Hdr.Pe32->FileHeader.Machine;
if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
//
// 1. Check OptionalHeader.NumberOfRvaAndSizes filed.
//
if (EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES < Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// 2. Check the FileHeader.SizeOfOptionalHeader field.
// OptionalHeader.NumberOfRvaAndSizes is not bigger than 16, so
// OptionalHeader.NumberOfRvaAndSizes * sizeof (EFI_IMAGE_DATA_DIRECTORY) will not overflow.
//
HeaderWithoutDataDir = sizeof (EFI_IMAGE_OPTIONAL_HEADER32) - sizeof (EFI_IMAGE_DATA_DIRECTORY) * EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES;
if (((UINT32)Hdr.Pe32->FileHeader.SizeOfOptionalHeader - HeaderWithoutDataDir) !=
Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes * sizeof (EFI_IMAGE_DATA_DIRECTORY))
{
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
SectionHeaderOffset = ImageContext->PeCoffHeaderOffset + sizeof (UINT32) + sizeof (EFI_IMAGE_FILE_HEADER) + Hdr.Pe32->FileHeader.SizeOfOptionalHeader;
//
// 3. Check the FileHeader.NumberOfSections field.
//
if (Hdr.Pe32->OptionalHeader.SizeOfImage <= SectionHeaderOffset) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
if ((Hdr.Pe32->OptionalHeader.SizeOfImage - SectionHeaderOffset) / EFI_IMAGE_SIZEOF_SECTION_HEADER <= Hdr.Pe32->FileHeader.NumberOfSections) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// 4. Check the OptionalHeader.SizeOfHeaders field.
//
if (Hdr.Pe32->OptionalHeader.SizeOfHeaders <= SectionHeaderOffset) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
if (Hdr.Pe32->OptionalHeader.SizeOfHeaders >= Hdr.Pe32->OptionalHeader.SizeOfImage) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
if ((Hdr.Pe32->OptionalHeader.SizeOfHeaders - SectionHeaderOffset) / EFI_IMAGE_SIZEOF_SECTION_HEADER < (UINT32)Hdr.Pe32->FileHeader.NumberOfSections) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// 4.2 Read last byte of Hdr.Pe32.OptionalHeader.SizeOfHeaders from the file.
//
Size = 1;
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
Hdr.Pe32->OptionalHeader.SizeOfHeaders - 1,
&Size,
&BufferData
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
//
// Check the EFI_IMAGE_DIRECTORY_ENTRY_SECURITY data.
// Read the last byte to make sure the data is in the image region.
// The DataDirectory array begin with 1, not 0, so here use < to compare not <=.
//
if (EFI_IMAGE_DIRECTORY_ENTRY_SECURITY < Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes) {
if (Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size != 0) {
//
// Check the member data to avoid overflow.
//
if ((UINT32)(~0) - Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].VirtualAddress <
Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size)
{
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// Read last byte of section header from file
//
Size = 1;
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].VirtualAddress +
Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size - 1,
&Size,
&BufferData
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
}
}
//
// Use PE32 offset
//
ImageContext->ImageType = Hdr.Pe32->OptionalHeader.Subsystem;
ImageContext->ImageSize = (UINT64)Hdr.Pe32->OptionalHeader.SizeOfImage;
ImageContext->SectionAlignment = Hdr.Pe32->OptionalHeader.SectionAlignment;
ImageContext->SizeOfHeaders = Hdr.Pe32->OptionalHeader.SizeOfHeaders;
} else if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
//
// 1. Check FileHeader.NumberOfRvaAndSizes filed.
//
if (EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES < Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// 2. Check the FileHeader.SizeOfOptionalHeader field.
// OptionalHeader.NumberOfRvaAndSizes is not bigger than 16, so
// OptionalHeader.NumberOfRvaAndSizes * sizeof (EFI_IMAGE_DATA_DIRECTORY) will not overflow.
//
HeaderWithoutDataDir = sizeof (EFI_IMAGE_OPTIONAL_HEADER64) - sizeof (EFI_IMAGE_DATA_DIRECTORY) * EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES;
if (((UINT32)Hdr.Pe32Plus->FileHeader.SizeOfOptionalHeader - HeaderWithoutDataDir) !=
Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes * sizeof (EFI_IMAGE_DATA_DIRECTORY))
{
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
SectionHeaderOffset = ImageContext->PeCoffHeaderOffset + sizeof (UINT32) + sizeof (EFI_IMAGE_FILE_HEADER) + Hdr.Pe32Plus->FileHeader.SizeOfOptionalHeader;
//
// 3. Check the FileHeader.NumberOfSections field.
//
if (Hdr.Pe32Plus->OptionalHeader.SizeOfImage <= SectionHeaderOffset) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
if ((Hdr.Pe32Plus->OptionalHeader.SizeOfImage - SectionHeaderOffset) / EFI_IMAGE_SIZEOF_SECTION_HEADER <= Hdr.Pe32Plus->FileHeader.NumberOfSections) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// 4. Check the OptionalHeader.SizeOfHeaders field.
//
if (Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders <= SectionHeaderOffset) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
if (Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders >= Hdr.Pe32Plus->OptionalHeader.SizeOfImage) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
if ((Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders - SectionHeaderOffset) / EFI_IMAGE_SIZEOF_SECTION_HEADER < (UINT32)Hdr.Pe32Plus->FileHeader.NumberOfSections) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// 4.2 Read last byte of Hdr.Pe32Plus.OptionalHeader.SizeOfHeaders from the file.
//
Size = 1;
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders - 1,
&Size,
&BufferData
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
//
// Check the EFI_IMAGE_DIRECTORY_ENTRY_SECURITY data.
// Read the last byte to make sure the data is in the image region.
// The DataDirectory array begin with 1, not 0, so here use < to compare not <=.
//
if (EFI_IMAGE_DIRECTORY_ENTRY_SECURITY < Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes) {
if (Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size != 0) {
//
// Check the member data to avoid overflow.
//
if ((UINT32)(~0) - Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].VirtualAddress <
Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size)
{
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// Read last byte of section header from file
//
Size = 1;
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].VirtualAddress +
Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size - 1,
&Size,
&BufferData
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
}
}
//
// Use PE32+ offset
//
ImageContext->ImageType = Hdr.Pe32Plus->OptionalHeader.Subsystem;
ImageContext->ImageSize = (UINT64)Hdr.Pe32Plus->OptionalHeader.SizeOfImage;
ImageContext->SectionAlignment = Hdr.Pe32Plus->OptionalHeader.SectionAlignment;
ImageContext->SizeOfHeaders = Hdr.Pe32Plus->OptionalHeader.SizeOfHeaders;
} else {
ImageContext->ImageError = IMAGE_ERROR_INVALID_MACHINE_TYPE;
return RETURN_UNSUPPORTED;
}
} else {
ImageContext->ImageError = IMAGE_ERROR_INVALID_MACHINE_TYPE;
return RETURN_UNSUPPORTED;
}
if (!PeCoffLoaderImageFormatSupported (ImageContext->Machine)) {
//
// If the PE/COFF loader does not support the image type return
// unsupported. This library can support lots of types of images
// this does not mean the user of this library can call the entry
// point of the image.
//
return RETURN_UNSUPPORTED;
}
//
// Check each section field.
//
if (ImageContext->IsTeImage) {
SectionHeaderOffset = sizeof (EFI_TE_IMAGE_HEADER);
NumberOfSections = (UINTN)(Hdr.Te->NumberOfSections);
} else {
SectionHeaderOffset = ImageContext->PeCoffHeaderOffset + sizeof (UINT32) + sizeof (EFI_IMAGE_FILE_HEADER) + Hdr.Pe32->FileHeader.SizeOfOptionalHeader;
NumberOfSections = (UINTN)(Hdr.Pe32->FileHeader.NumberOfSections);
}
for (Index = 0; Index < NumberOfSections; Index++) {
//
// Read section header from file
//
Size = sizeof (EFI_IMAGE_SECTION_HEADER);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
SectionHeaderOffset,
&Size,
&SectionHeader
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
//
// Adjust some field in Section Header for TE image.
//
if (ImageContext->IsTeImage) {
PeCoffLoaderAdjustOffsetForTeImage (&SectionHeader, (UINT32)Hdr.Te->StrippedSize - sizeof (EFI_TE_IMAGE_HEADER));
}
if (SectionHeader.SizeOfRawData > 0) {
//
// Section data should bigger than the Pe header.
//
if ((SectionHeader.VirtualAddress < ImageContext->SizeOfHeaders) ||
(SectionHeader.PointerToRawData < ImageContext->SizeOfHeaders))
{
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// Check the member data to avoid overflow.
//
if ((UINT32)(~0) - SectionHeader.PointerToRawData < SectionHeader.SizeOfRawData) {
ImageContext->ImageError = IMAGE_ERROR_UNSUPPORTED;
return RETURN_UNSUPPORTED;
}
//
// Base on the ImageRead function to check the section data field.
// Read the last byte to make sure the data is in the image region.
//
Size = 1;
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
SectionHeader.PointerToRawData + SectionHeader.SizeOfRawData - 1,
&Size,
&BufferData
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
}
//
// Check next section.
//
SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);
}
return RETURN_SUCCESS;
}
/**
Retrieves information about a PE/COFF image.
Computes the PeCoffHeaderOffset, IsTeImage, ImageType, ImageAddress, ImageSize,
DestinationAddress, RelocationsStripped, SectionAlignment, SizeOfHeaders, and
DebugDirectoryEntryRva fields of the ImageContext structure.
If ImageContext is NULL, then return RETURN_INVALID_PARAMETER.
If the PE/COFF image accessed through the ImageRead service in the ImageContext
structure is not a supported PE/COFF image type, then return RETURN_UNSUPPORTED.
If any errors occur while computing the fields of ImageContext,
then the error status is returned in the ImageError field of ImageContext.
If the image is a TE image, then SectionAlignment is set to 0.
The ImageRead and Handle fields of ImageContext structure must be valid prior
to invoking this service.
Caution: This function may receive untrusted input.
PE/COFF image is external input, so this routine will
also done many checks in PE image to make sure PE image DosHeader, PeOptionHeader,
SizeOfHeader, Section Data Region and Security Data Region be in PE image range.
@param ImageContext The pointer to the image context structure that describes the PE/COFF
image that needs to be examined by this function.
@retval RETURN_SUCCESS The information on the PE/COFF image was collected.
@retval RETURN_INVALID_PARAMETER ImageContext is NULL.
@retval RETURN_UNSUPPORTED The PE/COFF image is not supported.
**/
RETURN_STATUS
EFIAPI
PeCoffLoaderGetImageInfo (
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext
)
{
RETURN_STATUS Status;
EFI_IMAGE_OPTIONAL_HEADER_UNION HdrData;
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
EFI_IMAGE_DATA_DIRECTORY *DebugDirectoryEntry;
UINTN Size;
UINTN ReadSize;
UINTN Index;
UINTN DebugDirectoryEntryRva;
UINTN DebugDirectoryEntryFileOffset;
UINTN SectionHeaderOffset;
EFI_IMAGE_SECTION_HEADER SectionHeader;
EFI_IMAGE_DEBUG_DIRECTORY_ENTRY DebugEntry;
UINT32 NumberOfRvaAndSizes;
UINT32 TeStrippedOffset;
if (ImageContext == NULL) {
return RETURN_INVALID_PARAMETER;
}
//
// Assume success
//
ImageContext->ImageError = IMAGE_ERROR_SUCCESS;
ImageContext->SupportsNx = TRUE; // MU_CHANGE
Hdr.Union = &HdrData;
Status = PeCoffLoaderGetPeHeader (ImageContext, Hdr);
if (RETURN_ERROR (Status)) {
return Status;
}
//
// Retrieve the base address of the image
//
if (!(ImageContext->IsTeImage)) {
TeStrippedOffset = 0;
if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
//
// Use PE32 offset
//
ImageContext->ImageAddress = Hdr.Pe32->OptionalHeader.ImageBase;
} else {
//
// Use PE32+ offset
//
ImageContext->ImageAddress = Hdr.Pe32Plus->OptionalHeader.ImageBase;
}
} else {
TeStrippedOffset = (UINT32)Hdr.Te->StrippedSize - sizeof (EFI_TE_IMAGE_HEADER);
ImageContext->ImageAddress = (PHYSICAL_ADDRESS)(Hdr.Te->ImageBase + TeStrippedOffset);
}
//
// Initialize the alternate destination address to 0 indicating that it
// should not be used.
//
ImageContext->DestinationAddress = 0;
//
// Initialize the debug codeview pointer.
//
ImageContext->DebugDirectoryEntryRva = 0;
ImageContext->CodeView = NULL;
ImageContext->PdbPointer = NULL;
//
// Three cases with regards to relocations:
// - Image has base relocs, RELOCS_STRIPPED==0 => image is relocatable
// - Image has no base relocs, RELOCS_STRIPPED==1 => Image is not relocatable
// - Image has no base relocs, RELOCS_STRIPPED==0 => Image is relocatable but
// has no base relocs to apply
// Obviously having base relocations with RELOCS_STRIPPED==1 is invalid.
//
// Look at the file header to determine if relocations have been stripped, and
// save this information in the image context for later use.
//
if ((!(ImageContext->IsTeImage)) && ((Hdr.Pe32->FileHeader.Characteristics & EFI_IMAGE_FILE_RELOCS_STRIPPED) != 0)) {
ImageContext->RelocationsStripped = TRUE;
} else if ((ImageContext->IsTeImage) && (Hdr.Te->DataDirectory[0].Size == 0) && (Hdr.Te->DataDirectory[0].VirtualAddress == 0)) {
ImageContext->RelocationsStripped = TRUE;
} else {
ImageContext->RelocationsStripped = FALSE;
}
if (!(ImageContext->IsTeImage)) {
if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
//
// Use PE32 offset
//
NumberOfRvaAndSizes = Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes;
DebugDirectoryEntry = (EFI_IMAGE_DATA_DIRECTORY *)&(Hdr.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]);
// MU_CHANGE START
if (!(Hdr.Pe32->OptionalHeader.DllCharacteristics & IMAGE_DLLCHARACTERISTICS_NX_COMPAT)) {
ImageContext->SupportsNx = FALSE;
}
// MU_CHANGE END
} else {
//
// Use PE32+ offset
//
NumberOfRvaAndSizes = Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes;
DebugDirectoryEntry = (EFI_IMAGE_DATA_DIRECTORY *)&(Hdr.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG]);
// MU_CHANGE START
if (!(Hdr.Pe32Plus->OptionalHeader.DllCharacteristics & IMAGE_DLLCHARACTERISTICS_NX_COMPAT)) {
ImageContext->SupportsNx = FALSE;
}
// MU_CHANGE END
}
if (NumberOfRvaAndSizes > EFI_IMAGE_DIRECTORY_ENTRY_DEBUG) {
DebugDirectoryEntryRva = DebugDirectoryEntry->VirtualAddress;
//
// Determine the file offset of the debug directory... This means we walk
// the sections to find which section contains the RVA of the debug
// directory
//
DebugDirectoryEntryFileOffset = 0;
SectionHeaderOffset = ImageContext->PeCoffHeaderOffset +
sizeof (UINT32) +
sizeof (EFI_IMAGE_FILE_HEADER) +
Hdr.Pe32->FileHeader.SizeOfOptionalHeader;
for (Index = 0; Index < Hdr.Pe32->FileHeader.NumberOfSections; Index++) {
//
// Read section header from file
//
Size = sizeof (EFI_IMAGE_SECTION_HEADER);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
SectionHeaderOffset,
&Size,
&SectionHeader
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
if ((DebugDirectoryEntryRva >= SectionHeader.VirtualAddress) &&
(DebugDirectoryEntryRva < SectionHeader.VirtualAddress + SectionHeader.Misc.VirtualSize))
{
DebugDirectoryEntryFileOffset = DebugDirectoryEntryRva - SectionHeader.VirtualAddress + SectionHeader.PointerToRawData;
break;
}
SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);
}
if (DebugDirectoryEntryFileOffset != 0) {
for (Index = 0; Index < DebugDirectoryEntry->Size; Index += sizeof (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY)) {
//
// Read next debug directory entry
//
Size = sizeof (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
DebugDirectoryEntryFileOffset + Index,
&Size,
&DebugEntry
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
//
// From PeCoff spec, when DebugEntry.RVA == 0 means this debug info will not load into memory.
// Here we will always load EFI_IMAGE_DEBUG_TYPE_CODEVIEW type debug info. so need adjust the
// ImageContext->ImageSize when DebugEntry.RVA == 0.
//
if (DebugEntry.Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW) {
ImageContext->DebugDirectoryEntryRva = (UINT32)(DebugDirectoryEntryRva + Index);
if ((DebugEntry.RVA == 0) && (DebugEntry.FileOffset != 0)) {
ImageContext->ImageSize += DebugEntry.SizeOfData;
}
return RETURN_SUCCESS;
}
}
}
}
} else {
DebugDirectoryEntry = &Hdr.Te->DataDirectory[1];
DebugDirectoryEntryRva = DebugDirectoryEntry->VirtualAddress;
SectionHeaderOffset = (UINTN)(sizeof (EFI_TE_IMAGE_HEADER));
DebugDirectoryEntryFileOffset = 0;
for (Index = 0; Index < Hdr.Te->NumberOfSections;) {
//
// Read section header from file
//
Size = sizeof (EFI_IMAGE_SECTION_HEADER);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
SectionHeaderOffset,
&Size,
&SectionHeader
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
if ((DebugDirectoryEntryRva >= SectionHeader.VirtualAddress) &&
(DebugDirectoryEntryRva < SectionHeader.VirtualAddress + SectionHeader.Misc.VirtualSize))
{
DebugDirectoryEntryFileOffset = DebugDirectoryEntryRva -
SectionHeader.VirtualAddress +
SectionHeader.PointerToRawData -
TeStrippedOffset;
//
// File offset of the debug directory was found, if this is not the last
// section, then skip to the last section for calculating the image size.
//
if (Index < (UINTN)Hdr.Te->NumberOfSections - 1) {
SectionHeaderOffset += (Hdr.Te->NumberOfSections - 1 - Index) * sizeof (EFI_IMAGE_SECTION_HEADER);
Index = Hdr.Te->NumberOfSections - 1;
continue;
}
}
//
// In Te image header there is not a field to describe the ImageSize.
// Actually, the ImageSize equals the RVA plus the VirtualSize of
// the last section mapped into memory (Must be rounded up to
// a multiple of Section Alignment). Per the PE/COFF specification, the
// section headers in the Section Table must appear in order of the RVA
// values for the corresponding sections. So the ImageSize can be determined
// by the RVA and the VirtualSize of the last section header in the
// Section Table.
//
if ((++Index) == (UINTN)Hdr.Te->NumberOfSections) {
ImageContext->ImageSize = (SectionHeader.VirtualAddress + SectionHeader.Misc.VirtualSize) - TeStrippedOffset;
}
SectionHeaderOffset += sizeof (EFI_IMAGE_SECTION_HEADER);
}
if (DebugDirectoryEntryFileOffset != 0) {
for (Index = 0; Index < DebugDirectoryEntry->Size; Index += sizeof (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY)) {
//
// Read next debug directory entry
//
Size = sizeof (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY);
ReadSize = Size;
Status = ImageContext->ImageRead (
ImageContext->Handle,
DebugDirectoryEntryFileOffset + Index,
&Size,
&DebugEntry
);
if (RETURN_ERROR (Status) || (Size != ReadSize)) {
ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
if (Size != ReadSize) {
Status = RETURN_UNSUPPORTED;
}
return Status;
}
if (DebugEntry.Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW) {
ImageContext->DebugDirectoryEntryRva = (UINT32)(DebugDirectoryEntryRva + Index);
return RETURN_SUCCESS;
}
}
}
}
return RETURN_SUCCESS;
}
/**
Converts an image address to the loaded address.
@param ImageContext The context of the image being loaded.
@param Address The address to be converted to the loaded address.
@param TeStrippedOffset Stripped offset for TE image.
@return The converted address or NULL if the address can not be converted.
**/
VOID *
PeCoffLoaderImageAddress (
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
IN UINTN Address,
IN UINTN TeStrippedOffset
)
{
//
// Make sure that Address and ImageSize is correct for the loaded image.
//
if (Address >= ImageContext->ImageSize + TeStrippedOffset) {
ImageContext->ImageError = IMAGE_ERROR_INVALID_IMAGE_ADDRESS;
return NULL;
}
return (CHAR8 *)((UINTN)ImageContext->ImageAddress + Address - TeStrippedOffset);
}
// MS_CHANGE_?
/**
Retrieves the address of the SecurityCookie from the PE/COFF image.
This function locations the EFI_IMAGE_LOAD_CONFIG_DIRECTORY in the PE/COFF image
and gets the SecurityCookie field from this structure. This structure will only
exist in binaries built with the VS2013/VS2015 compilers without the /GS- flag.
NOTE: Only X64 binaries are supported at the moment
@param ImageContext The pointer to the image context structure that
describes the PE/COFF image that needs to be
examined by this function.
@param SecurityCookieAddress The pointer that receives the address of the
security cookie upon successful execution of this function
@retval RETURN_SUCCESS The information on the PE/COFF image was collected.
@retval RETURN_INVALID_PARAMETER ImageContext is NULL.
@retval RETURN_UNSUPPORTED The PE/COFF image is not supported.
**/
RETURN_STATUS
EFIAPI
PeCoffLoaderGetSecurityCookieAddress (
IN OUT PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext,
OUT UINT64 **SecurityCookieAddress
)
{
EFI_IMAGE_LOAD_CONFIG_DIRECTORY *LoadConfigDataDirectory;
EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
EFI_IMAGE_DATA_DIRECTORY *DataDirectory;
UINT64 Adjust;
PHYSICAL_ADDRESS BaseAddress;
UINT32 NumberOfRvaAndSizes;
UINT16 Magic;
*SecurityCookieAddress = NULL;
if (ImageContext == NULL) {
return RETURN_INVALID_PARAMETER;
}
//
// If the destination address is not 0, use that rather than the
// image address as the relocation target.
//
if (ImageContext->DestinationAddress != 0) {
BaseAddress = ImageContext->DestinationAddress;
} else {
BaseAddress = ImageContext->ImageAddress;
}
if ((ImageContext->Machine != IMAGE_FILE_MACHINE_X64) || ImageContext->IsTeImage) {
// DEBUG((DEBUG_INFO | DEBUG_LOAD, "SecurityCookie is only supported on X64 binaries\n"));
} else {
Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)((UINTN)ImageContext->ImageAddress + ImageContext->PeCoffHeaderOffset);
Magic = PeCoffLoaderGetPeHeaderMagicValue (Hdr);
if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
//
// Use PE32 offset
//
Adjust = (UINT64)BaseAddress - Hdr.Pe32->OptionalHeader.ImageBase;
if (Adjust != 0) {
Hdr.Pe32->OptionalHeader.ImageBase = (UINT32)BaseAddress;
}