mirror of
https://github.com/reactos/reactos.git
synced 2024-09-19 01:00:51 +00:00
73 lines
2 KiB
C
73 lines
2 KiB
C
/**
|
|
* This file has no copyright assigned and is placed in the Public Domain.
|
|
* This file is part of the w64 mingw-runtime package.
|
|
* No warranty is given; refer to the file DISCLAIMER within this package.
|
|
*/
|
|
|
|
#include <windows.h>
|
|
|
|
#if defined (_WIN64) && defined (__ia64__)
|
|
#error FIXME: Unsupported __ImageBase implementation.
|
|
#else
|
|
/* Hack, for bug in ld. Will be removed soon. */
|
|
#define __ImageBase _image_base__
|
|
/* This symbol is defined by the linker. */
|
|
extern IMAGE_DOS_HEADER __ImageBase;
|
|
#endif
|
|
|
|
BOOL
|
|
_ValidateImageBase (PBYTE pImageBase)
|
|
{
|
|
PIMAGE_DOS_HEADER pDOSHeader;
|
|
PIMAGE_NT_HEADERS pNTHeader;
|
|
PIMAGE_OPTIONAL_HEADER pOptHeader;
|
|
|
|
pDOSHeader = (PIMAGE_DOS_HEADER) pImageBase;
|
|
if (pDOSHeader->e_magic != IMAGE_DOS_SIGNATURE)
|
|
return FALSE;
|
|
pNTHeader = (PIMAGE_NT_HEADERS) ((PBYTE) pDOSHeader + pDOSHeader->e_lfanew);
|
|
if (pNTHeader->Signature != IMAGE_NT_SIGNATURE)
|
|
return FALSE;
|
|
pOptHeader = (PIMAGE_OPTIONAL_HEADER) &pNTHeader->OptionalHeader;
|
|
if (pOptHeader->Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
|
|
return FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
PIMAGE_SECTION_HEADER
|
|
_FindPESection (PBYTE pImageBase, DWORD_PTR rva)
|
|
{
|
|
PIMAGE_NT_HEADERS pNTHeader;
|
|
PIMAGE_SECTION_HEADER pSection;
|
|
unsigned int iSection;
|
|
|
|
pNTHeader = (PIMAGE_NT_HEADERS) (pImageBase + ((PIMAGE_DOS_HEADER) pImageBase)->e_lfanew);
|
|
|
|
for (iSection = 0, pSection = IMAGE_FIRST_SECTION (pNTHeader);
|
|
iSection < pNTHeader->FileHeader.NumberOfSections;
|
|
++iSection,++pSection)
|
|
{
|
|
if (rva >= pSection->VirtualAddress
|
|
&& rva < pSection->VirtualAddress + pSection->Misc.VirtualSize)
|
|
return pSection;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
BOOL
|
|
_IsNonwritableInCurrentImage (PBYTE pTarget)
|
|
{
|
|
PBYTE pImageBase;
|
|
DWORD_PTR rvaTarget;
|
|
PIMAGE_SECTION_HEADER pSection;
|
|
|
|
pImageBase = (PBYTE) &__ImageBase;
|
|
if (! _ValidateImageBase (pImageBase))
|
|
return FALSE;
|
|
rvaTarget = pTarget - pImageBase;
|
|
pSection = _FindPESection (pImageBase, rvaTarget);
|
|
if (pSection == NULL)
|
|
return FALSE;
|
|
return (pSection->Characteristics & IMAGE_SCN_MEM_WRITE) == 0;
|
|
}
|