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