AddSection function no section header space

[mateusReversing]

I have been trying to code my own pe explorer tool as a learning exercise but have been stuck on how to add a new section to the pe header when there is no space for another section header. I have looked at the functions source code given below and it doesn't seem to deal with this. Why is this?

https://bitbucket.org/mrexodia/titanengine-update/src/50379e53e9f3a1d9cf835e37e2fd7cbade61dc6a/TitanEngine/TitanEngine.PE.Section.cpp?at=master#cl-512

[simple]

That code failed for me too. Try step 1 in this tut it works on every .exe I tried.

 

http://www.codeproject.com/Articles/12532/Inject-your-code-to-a-Portable-Executable-file#PEMakerDownloadLink1

[mateusReversing]

Thanks for responding, I have been struggling with this for weeks.

Below is the source code to add a new section, I have tried to implement it though the I am still getting section header overflow so .text is still being overwritten, I am not sure where in the code below such a problem is dealt with. I'm now going to try to change the FileAlignment and then move up all sections though this will have a ripple effect on other aspects of the code that are affected by FileAlignment.

PIMAGE_SECTION_HEADER CPELibrary::AddNewSection(char* szName,DWORD dwSize)

{

	DWORD roffset,rsize,voffset,vsize;

	int i=image_nt_headers->FileHeader.NumberOfSections;

	rsize=PEAlign(dwSize, image_nt_headers->OptionalHeader.FileAlignment);

	vsize=PEAlign(rsize, image_nt_headers->OptionalHeader.SectionAlignment);

	roffset=PEAlign(image_section_header[i-1]->PointerToRawData+image_section_header[i-1]->SizeOfRawData,

				image_nt_headers->OptionalHeader.FileAlignment);

	voffset=PEAlign(image_section_header[i-1]->VirtualAddress+image_section_header[i-1]->Misc.VirtualSize,

				image_nt_headers->OptionalHeader.SectionAlignment);

	memset(image_section_header[i],0,(size_t)sizeof(IMAGE_SECTION_HEADER));

	image_section_header[i]->PointerToRawData=roffset;

	image_section_header[i]->VirtualAddress=voffset;

	image_section_header[i]->SizeOfRawData=rsize;

	image_section_header[i]->Misc.VirtualSize=vsize;

	image_section_header[i]->Characteristics=0xC0000040;

	memcpy(image_section_header[i]->Name,szName,(size_t)strlen(szName));

	image_section[i]=(char*)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT,rsize);

	image_nt_headers->FileHeader.NumberOfSections++;

	return (PIMAGE_SECTION_HEADER)image_section_header[i];

}

[simple]

The above code works for me so ur probably doing something wrong. Try this cli tool.

 

https://github.com/Ge0/PeTools/tree/master/PeAddSection/x86

[mateusReversing]

Thank you, the second link you provided helped me greatly though it took me some to get it to work, I can now add sections.