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131 lines (112 loc) · 3.43 KB
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/*
* ElfMemoryFile64.cpp
*
* Created on: Dec 8, 2013
* Author: tyler
*/
#include "ElfMemoryFile64.h"
#include "Process.h"
#include <iostream>
namespace Elf
{
ElfMemoryFile64::ElfMemoryFile64(const std::vector<MemoryRegion>& memoryRegions, const Process& process):
m_memoryRegions(memoryRegions), m_process(&process)
{
for(const auto& rgn : m_memoryRegions)
{
m_memoryData.push_back(process.readMemory(rgn.getStartPtr(), rgn.getSize()));
}
int i = 0;
for(const auto& region : m_memoryRegions)
{
//Find the header
if(region.getFileOffset() == 0)
{
uint8_t* data = m_memoryData[i].get();
m_header = *reinterpret_cast<Elf64_Ehdr*>(data);
if(m_header.e_ident[0] != ELFMAG0 || m_header.e_ident[1] != ELFMAG1 || m_header.e_ident[2] != ELFMAG2 || m_header.e_ident[3] != ELFMAG3)
{
throw std::runtime_error("Given data does not represent a valid ELF image");
}
if(m_header.e_ident[4] != ELFCLASS64)
{
throw std::runtime_error("ELF image is not 64-bit");
}
Elf64_Shdr* sectionTablePtr = reinterpret_cast<Elf64_Shdr*>(getMemoryDataPointerFromOffset(getMemoryPointerFromFileOffset(m_header.e_shoff)));
char* stringTable = reinterpret_cast<char*>(getMemoryDataPointerFromOffset(getMemoryPointerFromFileOffset(sectionTablePtr[m_header.e_shstrndx].sh_offset)));
for(int i = 0; i < m_header.e_shnum; ++i)
{
Elf64_Shdr header = sectionTablePtr[i];
std::string name;
if(header.sh_name != 0)
{
name = &stringTable[header.sh_name];
int x = 1;
}
m_sections.push_back(Elf::ElfMemorySection64(header, name));
if(name == ".dynsym")
{
int x = 0;
}
}
}
i++;
}
const ElfMemorySection64* dynamicSymbolSection = getSectionByName(".dynsym");
const ElfMemorySection64* dynamicStringTableSection = getSectionByName(".dynstr");
Elf64_Sym* dynamicSymbolTable = reinterpret_cast<Elf64_Sym*>(getMemoryDataPointerFromOffset(getMemoryPointerFromFileOffset(dynamicSymbolSection->getHeader().sh_offset)));
char* dynamicStringTable = reinterpret_cast<char*>(getMemoryDataPointerFromOffset(getMemoryPointerFromFileOffset(dynamicStringTableSection->getHeader().sh_offset)));
for(int i = 0; i < dynamicSymbolSection->getHeader().sh_size / sizeof(Elf64_Sym); ++i)
{
std::string name;
if(dynamicSymbolTable[i].st_name != 0)
{
name = &dynamicStringTable[dynamicSymbolTable[i].st_name];
}
if(dynamicSymbolTable[i].st_name != 0 && dynamicSymbolTable[i].st_value != 0)
{
m_exports.insert(std::make_pair(name, ElfExport64{dynamicSymbolTable[i].st_value, dynamicSymbolTable[i].st_shndx}));
}
int x = 0;
}
}
ElfMemoryFile64::~ElfMemoryFile64()
{
}
uintptr_t ElfMemoryFile64::getMemoryPointerFromFileOffset(uintptr_t offset) const
{
for(const auto& region : m_memoryRegions)
{
if(region.getFileOffset() <= offset && region.getFileOffset() + region.getSize() >= offset)
{
return offset - region.getFileOffset() + region.getStartPtr();
}
}
return 0;
}
uint8_t* ElfMemoryFile64::getMemoryDataPointerFromOffset(uintptr_t offset) const
{
int i = 0;
for(const auto& region : m_memoryRegions)
{
if(region.getStartPtr() <= offset && region.getEndPtr() >= offset)
{
return &m_memoryData[i][offset - region.getStartPtr()];
}
++i;
}
return nullptr;
}
const ElfMemorySection64* ElfMemoryFile64::getSectionByName(
const std::string& name) const
{
for(auto& section : m_sections)
{
if(section.getName() == name)
{
return §ion;
}
}
return nullptr;
}
}