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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
/*============================================================
**
** CorImage.cpp
**
** IMAGEHLP routines so we can avoid early binding to that DLL.
**
===========================================================*/
#include "stdafx.h"
#include "contract.h"
#include <daccess.h>
#include "corimage.h"
#include "safemath.h"
#define RTL_MEG (1024UL * 1024UL)
#define RTLP_IMAGE_MAX_DOS_HEADER ( 256UL * RTL_MEG)
// IMAGE_FIRST_SECTION doesn't need 32/64 versions since the file header is
// the same either way.
#define PTR_IMAGE_FIRST_SECTION( ntheader ) \
PTR_IMAGE_SECTION_HEADER \
(dac_cast<TADDR>(ntheader) + \
FIELD_OFFSET( IMAGE_NT_HEADERS, OptionalHeader ) + \
VAL16((ntheader)->FileHeader.SizeOfOptionalHeader) \
)
#ifndef DACCESS_COMPILE
IMAGE_NT_HEADERS *Cor_RtlImageNtHeader(VOID *pvBase, ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
IMAGE_NT_HEADERS *pNtHeaders = NULL;
if (pvBase && (pvBase != (VOID*)-1)) {
struct Param
{
IMAGE_DOS_HEADER *pDos;
ULONG FileLength;
IMAGE_NT_HEADERS *pNtHeaders;
} param;
param.pDos = (IMAGE_DOS_HEADER*)pvBase;
param.FileLength = FileLength;
param.pNtHeaders = pNtHeaders;
PAL_TRY(Param *, pParam, ¶m) {
if ( (pParam->pDos->e_magic == VAL16(IMAGE_DOS_SIGNATURE))
&& ((DWORD)VAL32(pParam->pDos->e_lfanew) < RTLP_IMAGE_MAX_DOS_HEADER)
&& ovadd_lt((DWORD)VAL32(pParam->pDos->e_lfanew), sizeof(IMAGE_FILE_HEADER) + sizeof(DWORD), pParam->FileLength)) {
pParam->pNtHeaders = (IMAGE_NT_HEADERS*)((BYTE*)pParam->pDos + VAL32(pParam->pDos->e_lfanew));
if (pParam->pNtHeaders->Signature != VAL32(IMAGE_NT_SIGNATURE))
pParam->pNtHeaders = NULL;
}
}
PAL_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
param.pNtHeaders = NULL;
}
PAL_ENDTRY
pNtHeaders = param.pNtHeaders;
}
return pNtHeaders;
}
#endif // #ifndef DACCESS_COMPILE
EXTERN_C PIMAGE_SECTION_HEADER
Cor_RtlImageRvaToSection32(PTR_IMAGE_NT_HEADERS32 NtHeaders,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
ULONG i;
PTR_IMAGE_SECTION_HEADER NtSection;
NtSection = PTR_IMAGE_FIRST_SECTION( NtHeaders );
for (i=0; i<NtHeaders->FileHeader.NumberOfSections; i++) {
if (FileLength &&
(((VAL32(NtSection->PointerToRawData) > FileLength)) ||
(VAL32(NtSection->SizeOfRawData) > FileLength - VAL32(NtSection->PointerToRawData))))
return NULL;
if (Rva >= VAL32(NtSection->VirtualAddress) &&
Rva < VAL32(NtSection->VirtualAddress) + VAL32(NtSection->SizeOfRawData))
return NtSection;
++NtSection;
}
return NULL;
}
EXTERN_C PIMAGE_SECTION_HEADER
Cor_RtlImageRvaToSection64(PTR_IMAGE_NT_HEADERS64 NtHeaders,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
ULONG i;
PTR_IMAGE_SECTION_HEADER NtSection;
NtSection = PTR_IMAGE_FIRST_SECTION( NtHeaders );
for (i=0; i<VAL16(NtHeaders->FileHeader.NumberOfSections); i++) {
if (FileLength &&
(((VAL32(NtSection->PointerToRawData) > FileLength)) ||
(VAL32(NtSection->SizeOfRawData) > FileLength - VAL32(NtSection->PointerToRawData))))
return NULL;
if (Rva >= VAL32(NtSection->VirtualAddress) &&
Rva < VAL32(NtSection->VirtualAddress) + VAL32(NtSection->SizeOfRawData))
return NtSection;
++NtSection;
}
return NULL;
}
EXTERN_C PIMAGE_SECTION_HEADER
Cor_RtlImageRvaToSection(PTR_IMAGE_NT_HEADERS NtHeaders,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
if (NtHeaders->OptionalHeader.Magic == VAL16(IMAGE_NT_OPTIONAL_HDR32_MAGIC))
return Cor_RtlImageRvaToSection32((PTR_IMAGE_NT_HEADERS32)NtHeaders,
Rva, FileLength);
else if(NtHeaders->OptionalHeader.Magic == VAL16(IMAGE_NT_OPTIONAL_HDR64_MAGIC))
return Cor_RtlImageRvaToSection64((PTR_IMAGE_NT_HEADERS64)NtHeaders,
Rva, FileLength);
else {
_ASSERTE(!"Invalid File Type");
return NULL;
}
}
EXTERN_C PBYTE Cor_RtlImageRvaToVa32(PTR_IMAGE_NT_HEADERS32 NtHeaders,
PBYTE Base,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
PIMAGE_SECTION_HEADER NtSection =
Cor_RtlImageRvaToSection32(NtHeaders,
Rva,
FileLength);
if (NtSection != NULL)
return (Base +
(Rva - VAL32(NtSection->VirtualAddress)) +
VAL32(NtSection->PointerToRawData));
else
return NULL;
}
EXTERN_C PBYTE Cor_RtlImageRvaToVa64(PTR_IMAGE_NT_HEADERS64 NtHeaders,
PBYTE Base,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
PIMAGE_SECTION_HEADER NtSection =
Cor_RtlImageRvaToSection64(NtHeaders,
Rva,
FileLength);
if (NtSection != NULL)
return (Base +
(Rva - VAL32(NtSection->VirtualAddress)) +
VAL32(NtSection->PointerToRawData));
else
return NULL;
}
EXTERN_C PBYTE Cor_RtlImageRvaToVa(PTR_IMAGE_NT_HEADERS NtHeaders,
PBYTE Base,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
if (NtHeaders->OptionalHeader.Magic == VAL16(IMAGE_NT_OPTIONAL_HDR32_MAGIC))
return Cor_RtlImageRvaToVa32((PTR_IMAGE_NT_HEADERS32)NtHeaders,
Base, Rva, FileLength);
else if(NtHeaders->OptionalHeader.Magic == VAL16(IMAGE_NT_OPTIONAL_HDR64_MAGIC))
return Cor_RtlImageRvaToVa64((PTR_IMAGE_NT_HEADERS64)NtHeaders,
Base, Rva, FileLength);
else {
_ASSERTE(!"Invalid File Type");
return NULL;
}
}
EXTERN_C PBYTE Cor_RtlImageDirToVa(PTR_IMAGE_NT_HEADERS NtHeaders,
PBYTE Base,
UINT DirIndex,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
if (NtHeaders->OptionalHeader.Magic == VAL16(IMAGE_NT_OPTIONAL_HDR32_MAGIC))
return Cor_RtlImageRvaToVa32((PTR_IMAGE_NT_HEADERS32)NtHeaders, Base,
VAL32(((PTR_IMAGE_NT_HEADERS32)NtHeaders)->OptionalHeader.DataDirectory[DirIndex].VirtualAddress),
FileLength);
else if(NtHeaders->OptionalHeader.Magic == VAL16(IMAGE_NT_OPTIONAL_HDR64_MAGIC))
return Cor_RtlImageRvaToVa64((PTR_IMAGE_NT_HEADERS64)NtHeaders, Base,
VAL32(((PTR_IMAGE_NT_HEADERS64)NtHeaders)->OptionalHeader.DataDirectory[DirIndex].VirtualAddress),
FileLength);
else {
_ASSERTE(!"Invalid File Type");
return NULL;
}
}
EXTERN_C PIMAGE_SECTION_HEADER
Cor_RtlImageRvaRangeToSection(PTR_IMAGE_NT_HEADERS NtHeaders,
ULONG Rva,
ULONG Range,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
ULONG i;
PTR_IMAGE_SECTION_HEADER NtSection;
if (!Range)
return Cor_RtlImageRvaToSection(NtHeaders, Rva, FileLength);
NtSection = PTR_IMAGE_FIRST_SECTION( NtHeaders );
for (i=0; i<VAL16(NtHeaders->FileHeader.NumberOfSections); i++) {
if (FileLength &&
((VAL32(NtSection->PointerToRawData) > FileLength) ||
(VAL32(NtSection->SizeOfRawData) > FileLength - VAL32(NtSection->PointerToRawData))))
return NULL;
if (Rva >= VAL32(NtSection->VirtualAddress) &&
Rva + Range <= VAL32(NtSection->VirtualAddress) + VAL32(NtSection->SizeOfRawData))
return NtSection;
++NtSection;
}
return NULL;
}
EXTERN_C DWORD Cor_RtlImageRvaToOffset(PTR_IMAGE_NT_HEADERS NtHeaders,
ULONG Rva,
ULONG FileLength)
{
LIMITED_METHOD_CONTRACT;
PIMAGE_SECTION_HEADER NtSection =
Cor_RtlImageRvaToSection(NtHeaders,
Rva,
FileLength);
if (NtSection)
return ((Rva - VAL32(NtSection->VirtualAddress)) +
VAL32(NtSection->PointerToRawData));
else
return NULL;
}
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