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Refactor disas code

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This commit is contained in:
gbucchino 2026-05-21 10:41:04 +02:00
parent b11cbe2d19
commit b7ceca6e89
18 changed files with 504 additions and 436 deletions
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RElicAnalysis-0.1.0
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RElicAnalysis-0.1.1 Executable file
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4
RElicAnalysis/CMakeLists.txt
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@ -72,7 +72,9 @@ if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
elf/mdielfview.cpp
elf/mdielfview.h
dialogabout.h dialogabout.cpp
dockmenu.h dockmenu.cpp
elf/elfsymbolmodel.h elf/elfsymbolmodel.cpp

216
RElicAnalysis/CMakeLists.txt.user
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@ -1,10 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE QtCreatorProject>
<!-- Written by QtCreator 12.0.2, 2026-05-01T15:14:32. -->
<!-- Written by QtCreator 12.0.2, 2026-05-21T10:40:49. -->
<qtcreator>
<data>
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</data>
<data>
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@ -76,7 +76,7 @@
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<value type="QString" key="ClangTools.DiagnosticConfig">Builtin.DefaultTidyAndClazy</value>
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@ -89,10 +89,10 @@
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@ -157,15 +158,16 @@
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@ -175,6 +177,7 @@
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@ -191,6 +194,7 @@
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@ -206,170 +210,7 @@
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@ -388,17 +229,18 @@
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4
RElicAnalysis/data.h
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@ -97,10 +97,8 @@ struct elfSymbol {
unsigned char st_info;
unsigned char st_other;
QByteArray st_shndx;
char *data;
//char *data;
uint64_t size;
int countEntries;
int entry;
};
struct elfHash {

3
RElicAnalysis/dataDisas.h
View File

@ -9,7 +9,8 @@
struct object_asm {
char cmd[SIZE_OBJECT_CMD]; // Store the command
char *hexCmd; // Store the command in hex
//char *hexCmd; // Store the command in hex
char hexCmd[SIZE_OBJECT_CMD];
size_t octets;
size_t addr; // Command start at
};

2
RElicAnalysis/dialogabout.cpp
View File

@ -6,7 +6,7 @@ DialogAbout::DialogAbout(): QDialog() {
QVBoxLayout *mainLayout = new QVBoxLayout;
QLabel *labelTitle = new QLabel("RElicAnalysis 0.1.0");
QLabel *labelTitle = new QLabel("RElicAnalysis 0.1.1");
QFont fontTitle;
fontTitle.setPointSize(15);
fontTitle.setBold(true);

19
RElicAnalysis/disasasm.cpp
View File

@ -29,7 +29,7 @@ static int dump_asm(void *stream, const char *fmt, ...){
/*
* Cf: https://github.com/bpftrace/bpftrace/blob/master/src/bfd-disasm.cpp#L49C1-L55C2
*/
/*static int dump_asm_styled(void *out __attribute__((unused)), enum disassembler_style s __attribute__((unused)),
static int dump_asm_styled(void *out __attribute__((unused)), enum disassembler_style s __attribute__((unused)),
const char *fmt __attribute__((unused)), ...)
{
struct dataDisas *sData = (struct dataDisas*)out;
@ -54,7 +54,7 @@ static int dump_asm(void *stream, const char *fmt, ...){
memcpy(sData->s_object_asm[index].cmd, tmp, strlen(tmp));
return 0;
}*/
}
struct dataDisas *disas_asm(unsigned char *buffer, uint64_t startAddress, size_t length){
struct disassemble_info disasm_info;
@ -94,8 +94,8 @@ static int dump_asm(void *stream, const char *fmt, ...){
* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=600b7b26c07a070d0153daa76b3806c1e52c9e00
* https://patchwork.yoctoproject.org/project/arm/patch/20220824025819.4888-1-jon.mason@arm.com/#5104
*/
//init_disassemble_info (&disasm_info, sData, dump_asm, dump_asm_styled);
init_disassemble_info (&disasm_info, sData, dump_asm);
init_disassemble_info (&disasm_info, sData, dump_asm, dump_asm_styled);
//init_disassemble_info (&disasm_info, sData, dump_asm);
disasm_info.arch = bfd_arch_i386;
disasm_info.mach = bfd_mach_x86_64;
disasm_info.read_memory_func = buffer_read_memory;
@ -119,6 +119,7 @@ static int dump_asm(void *stream, const char *fmt, ...){
int bufferIndex = 0;
while (i < length){
size_t octets = disas(i, &disasm_info);
//qDebug() << octets;
sData->s_object_asm[sData->countEntries].octets = octets;
sData->s_object_asm[sData->countEntries].addr = nextStart;
@ -127,10 +128,17 @@ static int dump_asm(void *stream, const char *fmt, ...){
* We free in the parsingElf file
*/
/* hexCmd object will be freed in parsingElf file */
sData->s_object_asm[sData->countEntries].hexCmd = (char*)malloc(sizeof(char) * octets);
/*sData->s_object_asm[sData->countEntries].hexCmd = (char*)malloc(sizeof(char) * octets);
if (!sData->s_object_asm[sData->countEntries].hexCmd){
qDebug() << "Failed ";
return NULL;
}*/
memcpy(sData->s_object_asm[sData->countEntries].hexCmd,
&buffer[bufferIndex],
octets);
i += octets;
nextStart += octets;
bufferIndex += octets;
@ -151,6 +159,5 @@ static int dump_asm(void *stream, const char *fmt, ...){
memset(&sData->s_object_asm[sData->countEntries], 0, sizeof(&sData->s_object_asm));
memset(sData->s_object_asm[sData->countEntries].cmd, 0, SIZE_OBJECT_CMD);
};
return sData;
}

34
RElicAnalysis/elf/elfsymbolmodel.cpp Normal file
View File

@ -0,0 +1,34 @@
#include "elfsymbolmodel.h"
#include <QDebug>
ElfSymbolModel::ElfSymbolModel() {
}
void ElfSymbolModel::setSymbol(struct elfSymbol *elf, struct elfObjectDisas *s){
if(!m_hash[elf])
m_hash[elf] = new QList<struct elfObjectDisas *>();
m_hash[elf]->append(s);
}
/*
* This function return the list of all keys, which represent a section in Elf
*/
QList<struct elfSymbol *> ElfSymbolModel::getKeys(){
return m_hash.keys();
}
/*
* This function return all asm code from the symbol specified in argument
*/
QList<struct elfObjectDisas *> *ElfSymbolModel::getASMCode(struct elfSymbol *symbol){
return m_hash.value(symbol);
}
ElfSymbolModel::~ElfSymbolModel(){
if (m_hash.size() > 0){
for (struct elfSymbol *key : m_hash.keys()){
if (m_hash[key])
delete m_hash[key];
}
}
}

22
RElicAnalysis/elf/elfsymbolmodel.h Normal file
View File

@ -0,0 +1,22 @@
#ifndef ELFSYMBOLMODEL_H
#define ELFSYMBOLMODEL_H
#include <QList>
#include <QHash>
#include "../data.h"
class ElfSymbolModel
{
public:
ElfSymbolModel();
~ElfSymbolModel();
void setSymbol(struct elfSymbol *, struct elfObjectDisas *);
QList<struct elfSymbol *> getKeys();
QList<struct elfObjectDisas *> *getASMCode(struct elfSymbol *);
private:
QHash<struct elfSymbol *, QList<struct elfObjectDisas *> *> m_hash;
};
#endif // ELFSYMBOLMODEL_H

1
RElicAnalysis/elf/mdielf.cpp
View File

@ -272,6 +272,7 @@ void MdiElf::_addCaracteristics(ElfData *elfData) {
s += "ELF number sections: " + QString::number(hexToInt(sElfHdr->e_shnum.toHex())) + "\n";
s += "ELF sections offset: " + QString::number(hexToInt(sElfHdr->e_shoff.toHex())) + "\n";
s += "String table: " + QString::number(hexToInt(sElfHdr->e_shstrndx.toHex())) + "\n";
s += "Bss size: " + QString::number(elfData->getBssSectionSize()) + " bytes\n";
m_textEditCaracteristics->setPlainText(s);
}

104
RElicAnalysis/elf/mdielfdisassembled.cpp
View File

@ -14,49 +14,8 @@ MdiElfDisassembled::MdiElfDisassembled(ProjectElf *projectElf): QMdiSubWindow()
// Main layout
QHBoxLayout *mainLayout = new QHBoxLayout;
/*
* Explorer part
* Get here all symbols, such as functions
*/
m_modelExplorer = new QStandardItemModel;
// ListView that contains all symbols
m_viewExplorer = new QListView;
m_viewExplorer->setModel(m_modelExplorer);
m_viewExplorer->setStyleSheet("border: none");
m_viewExplorer->setMaximumWidth(250);
connect(m_viewExplorer, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(_itemClicked(QModelIndex)));
// ASM code
m_modelAnalyse = new QStandardItemModel;
QHash<QByteArray, QList<struct elfObjectDisas *> *> disasCode = elfData->getDisasCode();
for (const QByteArray &key : disasCode.keys()){
// Add to the explorer
QStandardItem *itemExplorer = new QStandardItem(key);
m_modelExplorer->appendRow(itemExplorer);
// Add to the QListView
QStandardItem *item = new QStandardItem(key);
QFont font;
font.setItalic(true);
font.setPointSize(12);
item->setFont(font);
m_modelAnalyse->appendRow(item);
/*
* Add the modelIndex to the list.
* This list is used when the user has cliked the item
*/
m_listModelExplorer.append(m_modelAnalyse->indexFromItem(item));
/* Add the disas code to the QListView */
for (qsizetype i = 0; i < disasCode[key]->size(); ++i){
//qDebug() << "Disas: " << key << " " << disasCode[key]->at(i)->hexCmd;
QString s = sanitizeASMCode(disasCode[key]->at(i));
m_modelAnalyse->appendRow(new QStandardItem(s));
}
}
// ListView that contains the ASM code
m_viewAnalyse = new QListView;
@ -64,7 +23,54 @@ MdiElfDisassembled::MdiElfDisassembled(ProjectElf *projectElf): QMdiSubWindow()
m_viewAnalyse->setSelectionMode(QAbstractItemView::NoSelection);
//m_viewAnalyse->setStyleSheet("border: none");
mainLayout->addWidget(m_viewExplorer);
// We get all symbols and associate with the section (QTreeWidgetItem)
m_treeWidget = new QTreeWidget;
m_treeWidget->setMaximumWidth(250);
m_treeWidget->setHeaderHidden(true);
QHash<QByteArray, ElfSymbolModel *> hash = elfData->getAllSections();
if (hash.size() > 0){
for (const QByteArray &section : hash.keys()){
QTreeWidgetItem *itemSection = new QTreeWidgetItem(m_treeWidget);
itemSection->setText(0, section);
ElfSymbolModel *model = elfData->getSymbolsBySection(section);
// Add to the QListView (ViewAnalysis)
QStandardItem *itemAnalysisSection = new QStandardItem(section);
QFont font;
font.setItalic(true);
font.setBold(true);
font.setPointSize(12);
itemAnalysisSection->setFont(font);
m_modelAnalyse->appendRow(itemAnalysisSection);
QList<struct elfSymbol *> symbols = model->getKeys();
for (size_t i = 0; i < symbols.size(); i++){
// Add to the QTreeWidget
QTreeWidgetItem *subItem = new QTreeWidgetItem(itemSection);
struct elfSymbol *symbol = symbols.at(i);
subItem->setText(0, symbol->st_name);
// Add to the ViewAnalysis (QListView)
QStandardItem *itemSymbol = new QStandardItem(symbol->st_name);
QFont fontSymbol;
font.setItalic(true);
font.setPointSize(12);
itemSymbol->setFont(fontSymbol);
m_modelAnalyse->appendRow(itemSymbol);
// Dump the asm code
QList<struct elfObjectDisas *> *disas = model->getASMCode(symbol);
for (size_t j = 0; j < disas->size(); j++){
struct elfObjectDisas *obj = disas->at(j);
QStandardItem *itemASM = new QStandardItem(sanitizeASMCode(obj));
m_modelAnalyse->appendRow(itemASM);
}
}
}
}
mainLayout->addWidget(m_treeWidget);
mainLayout->addWidget(m_viewAnalyse);
widget->setLayout(mainLayout);
@ -83,26 +89,16 @@ QString MdiElfDisassembled::sanitizeASMCode(struct elfObjectDisas *obj){
char tabs[maxTab + 1]; /* +1 for the \0 */
memset(tabs, 0, maxTab);
size_t t;
//qDebug() << hexCmd << " " << len << " " << maxTab;
for(t = 0; t < maxTab; t++)
tabs[t] = ' ';
tabs[t] = '\t';
tabs[t + 1] = '\0';
return "\t" + hex + "\t" + hexCmd.toUpper() + tabs + obj->cmd;
}
void MdiElfDisassembled::_itemClicked(const QModelIndex &model){
int row = model.row();
if (row != -1){
m_viewAnalyse->clearSelection();
QModelIndex model = m_listModelExplorer.at(row);
QItemSelectionModel *selection = m_viewAnalyse->selectionModel();
selection->setCurrentIndex(model, QItemSelectionModel::Select);
}
}
MdiElfDisassembled::~MdiElfDisassembled(){
delete m_modelExplorer;
delete m_modelAnalyse;
delete m_viewExplorer;
delete m_viewAnalyse;
delete m_treeWidget;
}

8
RElicAnalysis/elf/mdielfdisassembled.h
View File

@ -8,6 +8,8 @@
#include <QHeaderView>
#include <QStandardItem>
#include <QStandardItemModel>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include "../projectelf.h"
/* Used for printing the ASM code */
@ -21,15 +23,11 @@ public:
private:
ProjectElf *m_projectElf;
QListView *m_viewExplorer;
QListView *m_viewAnalyse;
QStandardItemModel *m_modelExplorer;
QTreeWidget *m_treeWidget;
QStandardItemModel *m_modelAnalyse;
QList<QModelIndex> m_listModelExplorer;
QString sanitizeASMCode(struct elfObjectDisas *);
private slots:
void _itemClicked(const QModelIndex &);
};

53
RElicAnalysis/elfdata.cpp
View File

@ -13,20 +13,24 @@ ElfData::ElfData() {
m_listDynSymbols = new QList<struct elfSymbol *>;
}
void ElfData::addToHash(QByteArray b, struct elfObjectDisas *obj){
/*
* Here, we add the item in the list
* We create a map with the QList, a map contain an entry which contains a pointer to the QList
*/
if (!m_hash.contains(b)){
m_hash[b] = new QList<struct elfObjectDisas *>;
}
m_hash[b]->append(obj);
void ElfData::newSection(QByteArray b){
m_hashSections[b] = new ElfSymbolModel;
}
QHash<QByteArray, QList<struct elfObjectDisas *> *> ElfData::getDisasCode(){
return m_hash;
void ElfData::setSymbol(QByteArray b, struct elfSymbol *elf, struct elfObjectDisas *disas){
if (m_hashSections[b]){
//qDebug() << "New symbol: " << elf->st_name;
m_hashSections[b]->setSymbol(elf, disas);
}
}
ElfSymbolModel *ElfData::getSymbolsBySection(QByteArray b){
if (m_hashSections[b])
return m_hashSections[b];
}
QHash<QByteArray, ElfSymbolModel *> ElfData::getAllSections(){
return m_hashSections;
}
void ElfData::setArchitecture(int a){
@ -73,7 +77,7 @@ void ElfData::setProgramHeader(struct elfProgram *p){
void ElfData::setSectionHeader(struct elfSection *s){
m_listSections->append(s);
}
void ElfData::setSymbol(struct elfSymbol * s){
void ElfData::setSymbol(struct elfSymbol *s){
m_listSymbols->append(s);
}
void ElfData::setDynSymbols(struct elfSymbol *s){
@ -85,6 +89,9 @@ void ElfData::setHash(struct elfHash *h){
void ElfData::setTextSymbol(struct elfSymbol *sElfS){
m_listTextSymbols->append(sElfS);
}
void ElfData::setBssSectionSize(unsigned long s){
m_bssSectionSize = s;
}
struct elfIdent *ElfData::getIdentification(){
return m_sElfId;
@ -110,6 +117,9 @@ QList<struct elfSymbol *> *ElfData::getTextSymbols() {
QList<struct elfHash *> *ElfData::getHashes(){
return m_listHashes;
}
unsigned long ElfData::getBssSectionSize(){
return m_bssSectionSize;
}
QString ElfData::mapProgramType(int type){
QString text;
switch(type){
@ -332,8 +342,11 @@ ElfData::~ElfData() {
//for (qsizetype i = 0; i < m_listSections->size(); i++)
// free(m_listSections->at(i));
for (qsizetype i = 0; i < m_listSymbols->size(); i++)
free(m_listSymbols->at(i)->data);
for (qsizetype i = 0; i < m_listSymbols->size(); i++){
//qDebug() << "Freeing: " << m_listSymbols->at(i);
//free(m_listSymbols->at(i)->data);
//free(m_listSymbols->at(i));
}
// Clean from dynamic variables from parsingelf file
delete m_listProgs;
@ -343,9 +356,11 @@ ElfData::~ElfData() {
delete m_listHashes;
delete m_listDynSymbols;
for (const QByteArray &key : m_hash.keys()){
for (qsizetype i = 0; i < m_hash[key]->size(); i++)
free(m_hash[key]->at(i));
delete(m_hash[key]);
if(m_hashSections.size() > 0){
for (const QByteArray &key : m_hashSections.keys()){
if (m_hashSections[key]){
delete m_hashSections[key]; // delete ElfSymbolModel object
}
}
}
}

12
RElicAnalysis/elfdata.h
View File

@ -3,6 +3,7 @@
#include <QList>
#include <QStandardItem>
#include "elf/elfsymbolmodel.h"
#include "data.h"
enum Architecture{
@ -26,6 +27,7 @@ class ElfData {
void setSizeofElf_Ehdr(size_t);
void setSizeofElf_Phdr(size_t);
void setSizeofElf_Shdr(size_t);
void setBssSectionSize(unsigned long);
int getArchitecture();
struct elfIdent *getIdentification();
@ -39,6 +41,7 @@ class ElfData {
size_t getSizeofElf_Ehdr();
size_t getSizeofElf_Phdr();
size_t getSizeofElf_Shdr();
unsigned long getBssSectionSize();
QString mapProgramType(int);
QString mapSectionType(int);
@ -49,8 +52,10 @@ class ElfData {
QString mapMachineType(int);
QString mapSymbolType(int);
void addToHash(QByteArray, struct elfObjectDisas *);
QHash<QByteArray, QList<struct elfObjectDisas *> *> getDisasCode();
void newSection(QByteArray);
void setSymbol(QByteArray, struct elfSymbol *, struct elfObjectDisas *);
ElfSymbolModel *getSymbolsBySection(QByteArray);
QHash<QByteArray, ElfSymbolModel *> getAllSections();
private:
int m_architecture;
@ -65,7 +70,8 @@ class ElfData {
QList<struct elfSymbol *> *m_listDynSymbols;
QList<struct elfSymbol *> *m_listTextSymbols;
QList<struct elfHash *> *m_listHashes;
QHash<QByteArray, QList<struct elfObjectDisas *> *> m_hash;
QHash<QByteArray, ElfSymbolModel *> m_hashSections;
unsigned long m_bssSectionSize;
};
#endif // ELFDATA_H

18
RElicAnalysis/fileinfo.cpp
View File

@ -18,24 +18,6 @@ FileInfo::FileInfo(QFile &file) {
m_filename = info.fileName();
QString fullPath = m_path + "/" + m_filename;
m_rawData = NULL;
/* Get signature of the file */
//QByteArray b = file.readAll();
//m_rawData = b.data();
//m_rawData = (char *)malloc(m_sizeFile);
//qDebug() << "FOOO: " << b.size();
//memcpy(m_rawData, b.data(), b.size());
//m_rawData = b.constData();
//m_rawData = b.data();
//qDebug() << b[0] << b[1] << b[2] << b[3];
//QByteArray b1 = b + 1;
//qDebug() << b1[0] << b1[1] << b1[2] << b1[3];
/*QDataStream in(&file);
qint64 len = in.readRawData(m_rawData, m_sizeFile);
qDebug() << len;*/
/*
* I need to read the file in the old way, because with Qt functions, my buffer is corrupted
* i do not have the full data

434
RElicAnalysis/parsingelf.cpp
View File

@ -149,20 +149,24 @@ void elf32ProgramHdr(int fd, Elf32_Off phoff, off_t phnum){
}
bool elf64SectionHdr(const char *buffer, ElfData *elfData, size_t offset, quint16 shstrndx, int shnum){
size_t lenShdr = sizeof(Elf64_Shdr);
bool res = false;
struct elfSymbol *elfSymbols = NULL;
size_t symtabnum = 0;
// We malloc the variable and we free it in the elfData destructor
struct elfSection *elfS = (struct elfSection *)malloc(shnum * sizeof(struct elfSection));
;
if (elfS == NULL)
return false;
Elf64_Shdr *shdr = (Elf64_Shdr*)(buffer + offset);
Elf64_Sym *symtab = NULL;
// Get the string table header
Elf64_Shdr *strtab = &shdr[shstrndx];
Elf64_Shdr *shdrtext = NULL;
Elf64_Shdr *shdrfini = NULL;
Elf64_Shdr *shdrhash = NULL;
//Elf64_Shdr *shdrtext = NULL;
//Elf64_Shdr *shdrfini = NULL;
//Elf64_Shdr *shdrhash = NULL;
const char *b = buffer + strtab->sh_offset;
int indexStrTab = 0;
int indexSymbolTab = 0;
@ -172,6 +176,36 @@ bool elf64SectionHdr(const char *buffer, ElfData *elfData, size_t offset, quint1
int indexHashTab = 0;
int indexDynSymTab = 0;
/*
* We need to get the .symtab and .strtab
*/
for (int i = 0; i < shnum; i++){
const char *shname = b + shdr[i].sh_name;
// .symtab
if (shdr[i].sh_type == 0x02 && strcmp(shname, ".symtab") == 0)
indexSymbolTab = i;
// .strtab for symbal name
if (shdr[i].sh_type == 0x03 && strcmp(shname, ".strtab") == 0)
indexStrTab = i;
}
/* Get all symbols and store to the ElfData */
res = getAllSymbols(buffer, &symtab, &elfSymbols, &symtabnum, elfData, shdr, indexStrTab, indexSymbolTab);
if (!res){
free(elfS);
return false;
}
/*for (size_t i = 0; i < symtabnum; i++){
qDebug() << "Symbol: " << symtab[i].st_value;
}*/
// We need to get the symbol name
Elf64_Shdr *strTabShdr = &shdr[indexStrTab];
// Get section for symbol table
Elf64_Shdr *symtabShdr = &shdr[indexSymbolTab];
for (int i = 0; i < shnum; i++){
memset(&elfS[i], 0, sizeof(struct elfSection));
@ -186,7 +220,7 @@ bool elf64SectionHdr(const char *buffer, ElfData *elfData, size_t offset, quint1
elfS[i].sh_info = convertFrom32bits(shdr[i].sh_info);
elfS[i].sh_addralign = convertFrom32bits(shdr[i].sh_addralign);
elfS[i].sh_entsize = convertFrom32bits(shdr[i].sh_entsize);
qDebug() << elfS[i].sh_name << " " << elfS[i].sh_offset.toHex() << " " << elfS[i].sh_size.toHex();
//qDebug() << elfS[i].sh_name << " " << elfS[i].sh_offset.toHex() << " " << elfS[i].sh_size.toHex();
elfData->setSectionHeader(&elfS[i]);
const char *shname = b + shdr[i].sh_name;
@ -201,17 +235,93 @@ bool elf64SectionHdr(const char *buffer, ElfData *elfData, size_t offset, quint1
if (shdr[i].sh_type == 0x01 && strcmp(shname, ".text") == 0){
indexTextTab = i;
/*bool r = disasSection(buffer, elfData, ".text", shdr[i].sh_offset, shdr[i].sh_size);
if (!r)
return r;*/
elfData->newSection(".text");
unsigned long textoffset = 0, textend = 0;
textoffset = shdr[i].sh_offset;
// -1 for avoiding the .fini section
textend = shdr[i].sh_offset + shdr[i].sh_size;
// We get all symbols from .text section
for (size_t i = 0; i < symtabnum; i++){
unsigned long end = symtab[i].st_value + symtab[i].st_size;
if (symtab[i].st_value >= textoffset && end <= textend && symtab[i].st_value != textend){
const char *b2 = buffer + strTabShdr->sh_offset;
struct elfSymbol *sym = getElf64Sym(b2, symtab[i]);
//qDebug() << sym->st_name << " " << sym->st_size.toHex() << " " << sym->st_value.toHex();
/* Disas the asm code for the symbol and store to the elfData */
disasSymbol(buffer, ".text", elfData, sym, symtab[i].st_value, symtab[i].st_size);
//if (sym)
// free(sym);
}
//elfData->setTextSymbol(&(*elfS)[i]);
}
}
if (shdr[i].sh_type == 0x01 && strcmp(shname, ".fini") == 0)
if (shdr[i].sh_type == 0x01 && strcmp(shname, ".fini") == 0){
indexFiniTab = i;
/*bool r = disasSection(buffer, elfData, ".fini", shdr[i].sh_offset, shdr[i].sh_size);
if (!r)
return r;*/
elfData->newSection(".fini");
unsigned long finioffset = shdr[i].sh_offset;
unsigned long finiend = shdr[i].sh_offset + shdr[i].sh_size;
for (size_t i = 0; i < symtabnum; i++){
unsigned long end = symtab[i].st_value + symtab[i].st_size;
/*
* In the following code, we identify if the symbol is located in the .text section
* If yes, we add it to the QList<struct elfSymbol *>, that can be used for disassemble code
*/
if (symtab[i].st_value >= finioffset && end <= finiend && symtab[i].st_value != finiend){
const char *b2 = buffer + strTabShdr->sh_offset;
struct elfSymbol *sym = getElf64Sym(b2, symtab[i]);
disasSymbol(buffer, ".fini", elfData, sym, symtab[i].st_value, symtab[i].st_size);
/*if (sym)
free(sym);*/
}
//elfData->setTextSymbol(&(*elfS)[i]);
}
}
// .data
if (shdr[i].sh_type == 0x01){ }
if (shdr[i].sh_type == 0x01 && strcmp(shname, ".data") == 0){
/*bool r = disasSection(buffer, elfData, ".data", shdr[i].sh_offset, shdr[i].sh_size);
if (!r)
return r;*/
elfData->newSection(".data");
}
// .rodata
if (shdr[i].sh_type == 0x01 && strcmp(shname, ".rodata") == 0){
/*bool r = disasSection(buffer, elfData, ".rodata", shdr[i].sh_offset, shdr[i].sh_size);
if (!r)
return r;*/
elfData->newSection(".rodata");
}
// .hash
if (shdr[i].sh_type == 0x05 && strcmp(shname, ".hash") == 0)
if (shdr[i].sh_type == 0x05 && strcmp(shname, ".hash") == 0) {
indexHashTab = i;
/*bool r = disasSection(buffer, elfData, ".hash", shdr[i].sh_offset, shdr[i].sh_size);
if (!r)
return r;*/
elfData->newSection(".hash");
}
if (shdr[i].sh_type == 0xb && strcmp(shname, ".dynsym") == 0)
indexDynSymTab = i;
@ -220,41 +330,69 @@ bool elf64SectionHdr(const char *buffer, ElfData *elfData, size_t offset, quint1
indexDynStrTab = i;
// .bss
if (shdr[i].sh_type == 0x08){
//qDebug() << b + shdr[i].sh_name;
//char *bss = (char *)malloc(shdr[i].sh_size);
//memcpy(bss, buffer + shdr[i].sh_offset, shdr[i].sh_size);
//free(bss);
if (shdr[i].sh_type == 0x08 && strcmp(shname, ".bss") == 0) {
/*
* Add the .bss section size to ElfData.
* Should be printed into the caracteristics widgets
*/
elfData->setBssSectionSize(shdr[i].sh_size);
}
}
// Get all symbols in the .text section
shdrtext = &shdr[indexTextTab];
shdrfini = &shdr[indexFiniTab];
/*
* Not needed to use shdrfini->sh_offset for the range of the .text
* We can add shdrtext->sh_offset + shdrtext->sh_size
*/
/*
* We can try for each symbols, to get the section .text, .data, .rodata
* getTextSections, getRodataSections, getDataSections, etc. and push to a QList
*/
// Get all symbols
res = getSymbols(buffer, elfData, shdr, indexStrTab, indexSymbolTab, shdrtext->sh_offset, shdrfini->sh_offset);
if (!res)
return false;
// Get dynsym tab
getDynSym(buffer, elfData, shdr, indexDynSymTab, indexDynStrTab, indexHashTab); // Segmentation fault
getDynSym(buffer, elfData, shdr, indexDynSymTab, indexDynStrTab, indexHashTab);
// Hash table
shdrhash = &shdr[indexHashTab];
//shdrhash = &shdr[indexHashTab];
return true;
}
/*
* In this function, we get all symbols. A symbol is stored in the struct elfSymbol.\
* Each of them are stored in the ElfData
*
* Return false if any errors occurs and true if not
*/
bool getAllSymbols(const char *buffer, Elf64_Sym **symtab, struct elfSymbol **elfS, size_t *symtabnum, ElfData *elfData, Elf64_Shdr *shdr, int indexStrTab, int indexSymbolTab){
// Get section string table
Elf64_Shdr *strTabShdr = &shdr[indexStrTab];
// Get section for symbol table
Elf64_Shdr *symtabShdr = &shdr[indexSymbolTab];
const char *b2 = buffer + strTabShdr->sh_offset;
//Elf64_Sym *symtab = (Elf64_Sym*)(buffer + shdr[indexSymbolTab].sh_offset);
*symtab = (Elf64_Sym*)(buffer + shdr[indexSymbolTab].sh_offset);
*symtabnum = symtabShdr->sh_size / sizeof(Elf64_Sym);
/*
* Should be clean in the destructor in ElfData class
*/
*elfS = (struct elfSymbol *)malloc(*symtabnum * sizeof(struct elfSymbol));
if (!*elfS){
qDebug() << "Failed to allocate memory";
*elfS = NULL;
return false;
}
for (size_t i = 0; i < *symtabnum; i++){
memset(&(*elfS)[i], 0, sizeof(struct elfSymbol));
// Get the data block from the buffer with the st_value which indicate the offset and the st_size
(*elfS)[i].st_name = QByteArray(b2 + (*symtab)[i].st_name);
(*elfS)[i].st_info = (*symtab)[i].st_info;
(*elfS)[i].st_other = (*symtab)[i].st_other;
(*elfS)[i].st_size = convertFrom64bits((*symtab)[i].st_size);
(*elfS)[i].st_shndx = convertFrom16bits((*symtab)[i].st_shndx);
(*elfS)[i].st_value = convertFrom64bits((*symtab)[i].st_value);
elfData->setSymbol(&(*elfS)[i]);
}
return true;
}
/*
* This function decode the dynamic symbol
*/
bool getDynSym(const char *buffer, ElfData *elfData, Elf64_Shdr *shdr, int indexDynSymTab, int indexDynStrTab, int indexHashTab){
Elf64_Shdr *shdrdynsym = &shdr[indexDynSymTab];
Elf64_Shdr *shdrDynStr = &shdr[indexDynStrTab];
@ -265,19 +403,17 @@ bool getDynSym(const char *buffer, ElfData *elfData, Elf64_Shdr *shdr, int index
Elf64_Sym *symtab = (Elf64_Sym*)(buffer + shdrdynsym->sh_offset);
size_t symtabnum = shdrdynsym->sh_size / shdrdynsym->sh_entsize;
struct elfSymbol *elfS = (struct elfSymbol*)malloc(symtabnum * sizeof(elfSymbol));
struct elfSymbol *elfS = (struct elfSymbol*)malloc(symtabnum * sizeof(struct elfSymbol));
if (elfS == NULL){
qDebug() << "Failed to allocate memory";
return false;
}
for (size_t i = 0; i < symtabnum; i++){
memset(&elfS[i], 0, sizeof(struct elfSymbol));
// Get the data block from the buffer with the st_value which indicate the offset and the st_size
elfS[i].st_name = QByteArray(b2 + symtab[i].st_name);
//qDebug() << elfS[i].st_name ;
elfS[i].st_info = symtab[i].st_info;
elfS[i].st_other = symtab[i].st_other;
elfS[i].st_size = convertFrom64bits(symtab[i].st_size);
@ -288,122 +424,148 @@ bool getDynSym(const char *buffer, ElfData *elfData, Elf64_Shdr *shdr, int index
}
return true;
}
bool getSymbols(const char *buffer, ElfData *elfData, Elf64_Shdr *shdr, int indexStrTab, int indexSymbolTab, int offsetText, int offsetFini){
// Get section string table
Elf64_Shdr *strTabShdr = &shdr[indexStrTab];
// Get section for symbol table
Elf64_Shdr *symtabShdr = &shdr[indexSymbolTab];
const char *b2 = buffer + strTabShdr->sh_offset;
Elf64_Sym *symtab = (Elf64_Sym*)(buffer + shdr[indexSymbolTab].sh_offset);
size_t symtabnum = symtabShdr->sh_size / sizeof(Elf64_Sym);
/*
* In this function, we create the new struct elfSymbol, that contains informations regarding the elf
* the variable "b" contains the name of the symbol.
* The elfS object will be freed in the destructor of ElfSymbolModel
*/
struct elfSymbol *getElf64Sym(const char *b, const Elf64_Sym symtab){
struct elfSymbol *elfS = (struct elfSymbol *)malloc(sizeof(struct elfSymbol));
if (!elfS){
qDebug() << "NULL";
return NULL;
}
memset(elfS, 0, sizeof(struct elfSymbol));
struct elfSymbol *elfS = (struct elfSymbol*)malloc(symtabnum * sizeof(elfSymbol));
if (elfS == NULL){
qDebug() << "Failed to allocate memory";
elfS->st_name = b + symtab.st_name;
elfS->st_info = symtab.st_info;
elfS->st_other = symtab.st_other;
elfS->st_size = convertFrom64bits(symtab.st_size);
elfS->st_shndx = convertFrom16bits(symtab.st_shndx);
elfS->st_value = convertFrom64bits(symtab.st_value);
return elfS;
}
/*
* This function decode the buffer into asm code with the function disas_asm (binutils)
* The asm decoded is the symbol code located at the offset specified in argument of the function
* The result is store in struct elfObjectDisas
*/
bool disasSymbol(const char *buffer, QByteArray b, ElfData *elfData, struct elfSymbol *elfS, unsigned long long offset, unsigned long long size){
struct dataDisas *sData;
//size += 1;
unsigned char *tmp = (unsigned char*)malloc(size);
memcpy(tmp, buffer + offset, size);
sData = disas_asm(tmp, offset, size);
if (!sData){
sData = NULL;
return false;
}
for (size_t i = 0; i < symtabnum; i++){
memset(&elfS[i], 0, sizeof(struct elfSymbol));
for (int j = 0; j < sData->countEntries; j++){
/*
* The following structure is deleted in the destructor of the ElfData
* The object is stored in a QHash objects
*/
struct elfObjectDisas *sElfObjectDisas = new struct elfObjectDisas;
// Get the data block from the buffer with the st_value which indicate the offset and the st_size
elfS[i].st_name = QByteArray(b2 + symtab[i].st_name);
elfS[i].st_info = symtab[i].st_info;
elfS[i].st_other = symtab[i].st_other;
elfS[i].st_size = convertFrom64bits(symtab[i].st_size);
elfS[i].st_shndx = convertFrom16bits(symtab[i].st_shndx);
elfS[i].st_value = convertFrom64bits(symtab[i].st_value);
//qDebug() << elfS[i].st_name << " " << elfS[i].st_info << " " << symtab[i].st_size;
if (symtab[i].st_size > 0){
elfS[i].data = (char*)malloc(symtab[i].st_size);
memcpy(elfS[i].data, buffer + symtab[i].st_value, symtab[i].st_size);
elfS[i].size = symtab[i].st_size;
// We are going to the get Assembly code
struct dataDisas *sData = disas_asm((unsigned char*)elfS[i].data, symtab[i].st_value, elfS[i].size);
if (sData == NULL){
qDebug() << "Failed to get the assembly code";
// I must freeing elfS structures
/*for (size_t i = 0; i < symtabnum; i++)
free(&elfS[i]);*/
free(elfS);
elfS = NULL;
return false;
}
/*
* Nous allons decoder les fonctions des symbols
* Pourquoi pas les variables
*/
int type = (elfS[i].st_info) & 0xf;
//qDebug() << elfS[i].st_name << " " << elfS[i].st_info <<" " << type;
/*
* We will create a new list which will contains a struct elfObjectDisas
* and that structure store all disassembled code
* After, the entry index in struct elfSymbol is in index to the struct elfObjectDisas
*/
elfS[i].countEntries = sData->countEntries;
//QList<struct elfObjectDisas *> *list = new QList<struct elfObjectDisas*>;
//qDebug() << elfS[i].st_name;
// Create new entry
for (int j = 0; j < sData->countEntries; j++){
// Where I freeing the following structure ????
struct elfObjectDisas *sElfObjectDisas = new struct elfObjectDisas;
sElfObjectDisas->cmd = QByteArray(
sData->s_object_asm[j].cmd,
strlen(sData->s_object_asm[j].cmd)
);
sElfObjectDisas->hexCmd = QByteArray(
sData->s_object_asm[j].hexCmd,
sData->s_object_asm[j].octets
);
sElfObjectDisas->octets = sData->s_object_asm[j].octets;
sElfObjectDisas->addr = sData->s_object_asm[j].addr;
//qDebug() << sElfObjectDisas->hexCmd;
//list->append(sElfObjectDisas);
if (type == 2){
elfData->addToHash(elfS[i].st_name, sElfObjectDisas);
}
}
// Store the symbol disassembled code and get the index
//elfS[i].entry = elfData->setSymbolDisassembled(list);
/*
* We don't need it anymore, we could clean our sData which contains the disas code
*/
free(sData->s_object_asm->hexCmd);
if (sElfObjectDisas == nullptr){
//free(sData->s_object_asm->hexCmd);
free(sData->s_object_asm);
free(sData);
sData = NULL;
return false;
}
elfData->setSymbol(&elfS[i]);
//qDebug() << b2 + symtab[i].st_name << " " << symtab[i].st_value << " " << offsetText << " " << offsetFini;
//qDebug() << b2 + symtab[i].st_name << " " << symtab[i].st_value << " " << symtab[i].st_size;
// We check if the symbol is in the .text section
if (symtab[i].st_value >= offsetText && symtab[i].st_value <= offsetFini){
elfData->setTextSymbol(&elfS[i]);
}
memset(sElfObjectDisas, 0, sizeof(struct sElfObjectDisas *));
/*
* We can push the symbols to the correct list
* For instance, if symtab[i].st_name == .rodata, we push to the QList
* Also, we can check with the size of the symbols
* size_t l = symtab[i].st_value + symtab[i].st_size
*/
sElfObjectDisas->cmd = QByteArray(
sData->s_object_asm[j].cmd,
strlen(sData->s_object_asm[j].cmd)
);
sElfObjectDisas->hexCmd = QByteArray(
sData->s_object_asm[j].hexCmd,
sData->s_object_asm[j].octets
);
sElfObjectDisas->octets = sData->s_object_asm[j].octets;
sElfObjectDisas->addr = sData->s_object_asm[j].addr;
elfData->setSymbol(b, elfS, sElfObjectDisas);
}
//free(sData->s_object_asm->hexCmd);
free(sData->s_object_asm);
free(sData);
sData = NULL;
return true;
}
void getSymbolsText(struct elfSection *sElfS, int indexTextTab, int inexFiniTab){
/*
* This function decode the buffer into asm code with the function disas_asm (binutils)
* The result is store in struct elfObjectDisas
*/
bool disasSection(const char *buffer, ElfData *elfData, const QByteArray b, quint64 offset, quint64 size){
struct dataDisas *sData;
unsigned char *tmp = (unsigned char*)malloc(size);
memcpy(tmp, buffer + offset, size);
sData = disas_asm(tmp, offset, size);
if (!sData){
sData = NULL;
return false;
}
for (int j = 0; j < sData->countEntries; j++){
/*
* The following structure is deleted in the destructor of the ElfData
* The object is stored in a QHash objects
*/
struct elfObjectDisas *sElfObjectDisas = new struct elfObjectDisas;
if (sElfObjectDisas == nullptr){
free(sData->s_object_asm->hexCmd);
free(sData->s_object_asm);
free(sData);
sData = NULL;
return false;
}
memset(sElfObjectDisas, 0, sizeof(struct sElfObjectDisas *));
sElfObjectDisas->cmd = QByteArray(
sData->s_object_asm[j].cmd,
strlen(sData->s_object_asm[j].cmd)
);
sElfObjectDisas->hexCmd = QByteArray(
sData->s_object_asm[j].hexCmd,
sData->s_object_asm[j].octets
);
sElfObjectDisas->octets = sData->s_object_asm[j].octets;
sElfObjectDisas->addr = sData->s_object_asm[j].addr;
//qDebug() << sElfObjectDisas->hexCmd.toHex();
//QString addr;
//addr.setNum(sElfObjectDisas->addr, 16);
//elfData->setSection(b, sElfObjectDisas);
}
//free(sData->s_object_asm->hexCmd);
free(sData->s_object_asm);
free(sData);
sData = NULL;
return true;
}
bool getHashes(const char *buffer, ElfData *elfData){
return true;
}

6
RElicAnalysis/parsingelf.h
View File

@ -41,10 +41,12 @@ bool elf64ProgramHdr(const char *, ElfData *, size_t, int);
void elf32ProgramHdr(int, Elf32_Off, off_t);
bool elf64SectionHdr(const char *, ElfData *, size_t, quint16, int);
void elf32SectionHdr(int, Elf32_Off, off_t);
bool getSymbols(const char *, ElfData *, Elf64_Shdr *, int, int, int, int);
bool disasSymbol(const char *, QByteArray, ElfData *, struct elfSymbol *, unsigned long long, unsigned long long);
bool disasSection(const char *, ElfData *, const QByteArray, quint64, quint64);
bool getAllSymbols(const char *, Elf64_Sym **, struct elfSymbol **, size_t *, ElfData *, Elf64_Shdr *, int, int);
bool getDynSym(const char *, ElfData *, Elf64_Shdr *, int, int, int);
void getSymbolsText(struct elfSection *, int, int);
bool getHashes(const char *, ElfData *);
struct elfSymbol *getElf64Sym(const char *, const Elf64_Sym);
QByteArray convertFrom16bits(quint16);
QByteArray convertFrom32bits(quint32);
QByteArray convertFrom64bits(quint64);