Ejemplo n.º 1
0
    void serialize(std::ofstream &file, char ei_class, char ei_data)
    {
        // Readjust code offsets
        for (std::vector<ElfSection *>::iterator c = code.begin(); c != code.end(); c++)
            (*c)->getShdr().sh_addr += getAddr();

        // Apply relocations
        for (ElfSection *rel = elf->getSection(1); rel != NULL; rel = rel->getNext())
            if ((rel->getType() == SHT_REL) || (rel->getType() == SHT_RELA)) {
                ElfSection *section = rel->getInfo().section;
                if ((section->getType() == SHT_PROGBITS) && (section->getFlags() & SHF_EXECINSTR)) {
                    if (rel->getType() == SHT_REL)
                        apply_relocations((ElfRel_Section<Elf_Rel> *)rel, section);
                    else
                        apply_relocations((ElfRel_Section<Elf_Rela> *)rel, section);
                }
            }

        ElfSection::serialize(file, ei_class, ei_data);
    }
Ejemplo n.º 2
0
bool ElfRelocator::init(const std::wstring& inputName)
{
	relocator = Arch->getElfRelocator();
	if (relocator == NULL)
	{
		Logger::printError(Logger::Error,L"Object importing not supported for this architecture");
		return false;
	}

	auto inputFiles = loadArArchive(inputName);
	if (inputFiles.size() == 0)
	{
		Logger::printError(Logger::Error,L"Could not load library");
		return false;
	}

	for (ArFileEntry& entry: inputFiles)
	{
		ElfRelocatorFile file;

		ElfFile* elf = new ElfFile();
		if (elf->load(entry.data,false) == false)
		{
			Logger::printError(Logger::Error,L"Could not load object file %s",entry.name);
			return false;
		}

		if (elf->getType() != 1)
		{
			Logger::printError(Logger::Error,L"Unexpected ELF type %d in object file %s",elf->getType(),entry.name);
			return false;
		}

		if (elf->getSegmentCount() != 0)
		{
			Logger::printError(Logger::Error,L"Unexpected segment count %d in object file %s",elf->getSegmentCount(),entry.name);
			return false;
		}

		// load all relevant sections of this file
		for (size_t s = 0; s < elf->getSegmentlessSectionCount(); s++)
		{
			ElfSection* sec = elf->getSegmentlessSection(s);
			if (!(sec->getFlags() & SHF_ALLOC))
				continue;

			if (sec->getType() == SHT_PROGBITS || sec->getType() == SHT_NOBITS || sec->getType() == SHT_INIT_ARRAY)
			{
				ElfRelocatorSection sectionEntry;
				sectionEntry.section = sec;
				sectionEntry.index = s;
				sectionEntry.relSection = NULL;
				sectionEntry.label = NULL;

				// search relocation section
				for (size_t k = 0; k < elf->getSegmentlessSectionCount(); k++)
				{
					ElfSection* relSection = elf->getSegmentlessSection(k);
					if (relSection->getType() != SHT_REL)
						continue;
					if (relSection->getInfo() != s)
						continue;

					// got it
					sectionEntry.relSection = relSection;
					break;
				}

				// keep track of constructor sections
				if (sec->getName() == ".ctors" || sec->getName() == ".init_array")
				{
					ElfRelocatorCtor ctor;
					ctor.symbolName = Global.symbolTable.getUniqueLabelName();
					ctor.size = sec->getSize();

					sectionEntry.label = Global.symbolTable.getLabel(ctor.symbolName,-1,-1);
					sectionEntry.label->setDefined(true);

					ctors.push_back(ctor);
				}

				file.sections.push_back(sectionEntry);
			}
		}

		// init exportable symbols
		for (int i = 0; i < elf->getSymbolCount(); i++)
		{
			Elf32_Sym symbol;
			bool found = elf->getSymbol(symbol, i);

			if (ELF32_ST_BIND(symbol.st_info) == STB_GLOBAL && symbol.st_shndx != 0)
			{
				ElfRelocatorSymbol symEntry;
				symEntry.type = ELF32_ST_TYPE(symbol.st_info);
				symEntry.name = convertUtf8ToWString(elf->getStrTableString(symbol.st_name));
				symEntry.relativeAddress = symbol.st_value;
				symEntry.section = symbol.st_shndx;
				symEntry.size = symbol.st_size;
				symEntry.label = NULL;

				file.symbols.push_back(symEntry);
			}
		}

		file.elf = elf;
		file.name = entry.name;
		files.push_back(file);
	}

	return true;
}