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section.cc
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/*
* =====================================================================================
*
* Filename: section.c
*
* Description:
*
* Version: 1.0
* Created: 03/20/2014 03:13:10 PM
* Revision: none
* Compiler: gcc
*
* Author: YOUR NAME (),
* Organization:
*
* =====================================================================================
*/
#include <iostream>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <map>
#include <cmath>
#include "section.h"
#include "sectionGD.h"
#include <fstream>
void SCSection::init(UINT8 *file_data, UINT8 *sec_strn_table)
{
int name_length = strlen((const char *)(sec_strn_table + this->sec_name_offset));
this->sec_name = (UINT8 *)malloc(name_length + 1);
strcpy((char *)this->sec_name, (const char *)(sec_strn_table + this->sec_name_offset));
this->sec_name[name_length] = '\0';
this->sec_data = (UINT8 *)malloc(this->sec_datasize);
memcpy(this->sec_data, file_data + this->sec_file_offset, this->sec_datasize);
}
SCSection *SCSection::mergeSection(SCSection *sec)
{
UINT8 *buffer;
int addition, target_datasize, source_datasize, target_newdatasize;
target_datasize = this->sec_datasize;
source_datasize = sec->sec_datasize;
UINT32 source_align = sec->sec_align;
addition = 0;
while ((target_datasize + addition) % source_align != 0)
addition++;
target_newdatasize = target_datasize + addition + source_datasize;
buffer = (UINT8 *)malloc(target_newdatasize);
memset(buffer, 0x0, target_newdatasize);
memcpy(buffer, this->sec_data, target_datasize);
memcpy(buffer + target_datasize + addition, sec->sec_data, source_datasize);
free(this->sec_data);
this->sec_data = buffer;
this->sec_datasize = target_newdatasize;
this->sec_align = this->sec_align > source_align ? this->sec_align : source_align;
sec->sec_mergeto = this;
sec->sec_delta = target_datasize + addition;
return sec;
}
int SCSection::getDynamicAttributeData(int tag) const
{
int i, number;
number = this->sec_datasize / this->sec_entsize;
for (i = 0; i < number; i++) {
Elf32_Dyn *cur_dyn;
cur_dyn = (Elf32_Dyn *)(this->sec_data + this->sec_entsize * i);
if (cur_dyn->d_tag == tag) {
return cur_dyn->d_un.d_val;
}
}
}
void SCSection::setSecContent(int offset, char *data, int size)
{
memcpy(this->sec_data + offset, data, size);
}
void SCSection::setInterpData(const char *ld_file)
{
int length;
length = strlen(ld_file);
this->sec_data = (UINT8 *)malloc(length + 1);
memset(this->sec_data, 0x0, length + 1);
this->sec_datasize = length + 1;
strcpy((char *)this->sec_data, ld_file);
}
void SCSection::setDynstrData(SCSymbolListDYN* sym_list, char **so_files, int number)
{
int length;
/* Allocat the first 0x0 here */
this->sec_data = (UINT8 *)malloc(1);
memset(this->sec_data, 0x0, 1);
this->sec_datasize = 1;
/* Add the so files names */
for (int i = 0; i < number; i++) {
length = strlen(so_files[i]);
this->expandSecData(so_files[i], length + 1, 1);
}
/* Add dynamic symbol names
* skip the first NULL symbol */
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin() + 1; it != sym_list->getSymbolList()->end(); ++it) {
length = strlen((char *)(*it)->getSymbolName());
/* this is the offset, can be setteld here */
(*it)->setSymbolNameOffset(this->sec_datasize);
this->expandSecData((char *)(*it)->getSymbolName(), length + 1, 1);
}
/* Add version names
* skip the first NULL symbol*/
map<UINT8*, int> ver;
map<UINT8*, int>::iterator vit;
for (it = sym_list->getSymbolList()->begin() + 1; it != sym_list->getSymbolList()->end(); ++it) {
if ((*it)->getSymbolVersionName() == NULL)
continue;
vit = ver.find((*it)->getSymbolVersionName());
if (vit != ver.end())
continue;
length = strlen((char *)(*it)->getSymbolVersionName());
this->expandSecData((char *)(*it)->getSymbolVersionName(), length + 1, 1);
ver[(*it)->getSymbolVersionName()] = 1;
}
}
void SCSection::setDynsymData(SCSymbolListDYN *sym_list)
{
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
Elf32_Sym *temp;
temp = (Elf32_Sym *)malloc(sizeof(Elf32_Sym));
temp->st_name = (*it)->getSymbolNameOffset();
temp->st_value = (*it)->getSymbolValue();
temp->st_size = (*it)->getSymbolSize();
temp->st_info = ((*it)->getSymbolBinding() << 4) + ((*it)->getSymbolType() & 0xf);
temp->st_other = (*it)->getSymbolOther();
temp->st_shndx = (*it)->getSymbolShndx();
this->expandSecData((char *)temp, sizeof(Elf32_Sym), 1);
free(temp);
}
}
void SCSection::setHashData(SCSymbolListDYN *sym_list)
{
int number = 0;
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
number++;
}
int nbuckets, nchains;
nchains = number;
nbuckets = (int)log2(number) + 1;
int datasize = (1 + 1+ nbuckets + nchains) * 4;
UINT8 *buffer;
buffer = (UINT8 *)malloc(datasize);
memset(buffer, 0x0, datasize);
memcpy(buffer, &nbuckets, sizeof(int));
memcpy(buffer + 4, &nchains, sizeof(int));
for (it = sym_list->getSymbolList()->end() - 1; it != sym_list->getSymbolList()->begin(); --it) {
int hashvalue = this->calculateHash((*it)->getSymbolName());
int order, index, symbolIndex;
order = hashvalue % nbuckets;
index = *(int *)((buffer + 8 + order * 4));
symbolIndex = (*it)->getSymbolIndex();
if (index == 0)
memcpy(buffer + 8 + order * 4, &symbolIndex, sizeof(int));
else {
order = index;
index = *(int *)((buffer + 8 + nbuckets * 4 + order * 4));
while (index) {
order = index;
index = *(int *)((buffer + 8 + nbuckets * 4 + order * 4));
}
memcpy(buffer + 8 + nbuckets * 4 + order * 4, &symbolIndex, 4);
}
}
this->expandSecData((char *)buffer, datasize, 1);
free(buffer);
}
void SCSection::setGVData(SCSymbolListDYN *sym_list)
{
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
UINT16 ver;
ver = (*it)->getSymbolVersion();
this->expandSecData((char *)&ver, sizeof(UINT16), 1);
}
}
void SCSection::setGNRData(SCSymbolListDYN *sym_list, char **so_files, int number, SCSection *dynstr)
{
for (int i = 0; i < number; i++) {
vector<SCSymbolDYN*>::iterator it;
int ver_number = 0;
/* Store the versions <name, number>*/
map<UINT8*, int> ver;
map<UINT8*, int>::iterator vit;
/* Have to skip the first NULL symbol */
for (it = sym_list->getSymbolList()->begin() + 1; it != sym_list->getSymbolList()->end(); ++it) {
if ((*it)->getSymbolVersionName() == NULL ||
strcmp((char *)(*it)->getSymbolFile(), so_files[i]))
continue;
vit = ver.find((*it)->getSymbolVersionName());
if (vit != ver.end())
continue;
ver[(*it)->getSymbolVersionName()] = (*it)->getSymbolVersion();
ver_number++;
}
Elf32_Verneed verneed;
verneed.vn_version = 1;
verneed.vn_cnt = ver_number;
verneed.vn_file = this->findOffset(dynstr, so_files[i]);
verneed.vn_aux = 0x10;
verneed.vn_next = (i == number - 1) ? 0 : sizeof(Elf32_Vernaux) * ver_number;
this->expandSecData((char *)&verneed, sizeof(Elf32_Verneed), 1);
for (vit = ver.begin(); vit != ver.end(); ++vit) {
Elf32_Vernaux vernaux;
UINT8 *version_name;
UINT16 version_number;
version_name = vit->first;
version_number = vit->second;
vernaux.vna_hash = this->calculateHash(version_name);
vernaux.vna_flags = 0;
vernaux.vna_other = version_number;
vernaux.vna_name = this->findOffset(dynstr, (char *)version_name);
if ((++vit) == ver.end())
vernaux.vna_next = 0;
else
vernaux.vna_next = 0x10;
--vit;
this->expandSecData((char *)&vernaux, sizeof(Elf32_Vernaux), 1);
}
}
}
void SCSection::setPLTData(SCSymbolListDYN *sym_list)
{
/* Add the first three instructions */
this->addPLTTop();
vector<SCSymbolDYN*>::iterator it;
int n = 0;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
if (!((*it)->getSymbolSdType() & SYM_PLT))
continue;
Instr instr[3];
int offset = 0;
instr[0].opcode = 0x25ff;
instr[0].oprand = 0x0;
instr[1].opcode = 0x68;
instr[1].oprand = n * 0x8;
instr[2].opcode = 0xe9;
instr[2].oprand = 0x0;
/* sizeof(Instr) is 8 instead of 6 because of alignment */
UINT8 *buffer;
buffer = (UINT8 *)malloc(0x10);
memset(buffer, 0x0, 0x10);
memcpy(buffer + offset, &(instr[0].opcode), 2);
offset += 2;
memcpy(buffer + offset, &(instr[0].oprand), 4);
offset += 4;
for (int i = 1; i < 3; i++) {
memcpy(buffer + offset, &(instr[i].opcode), 1);
offset += 1;
memcpy(buffer + offset, &(instr[i].oprand), 4);
offset += 4;
}
this->expandSecData((char *)buffer, 0x10, 1);
free(buffer);
n++;
}
}
void SCSection::setGOTPLTData(SCSymbolListDYN *sym_list)
{
UINT8 *buffer;
buffer = (UINT8 *)malloc(0xc);
memset(buffer, 0x0, 0xc);
this->expandSecData((char *)buffer, 0xc, 1);
free(buffer);
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
if (!((*it)->getSymbolSdType() & SYM_PLT))
continue;
buffer = (UINT8 *)malloc(0x4);
memset(buffer, 0x0, 0x4);
this->expandSecData((char *)buffer, 0x4, 1);
free(buffer);
}
}
void SCSection::setRELPLTData(SCSymbolListDYN *sym_list)
{
int index = 0;
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
if (!((*it)->getSymbolSdType() & SYM_PLT))
continue;
Elf32_Rel rel;
rel.r_offset = 0xc + 0x4 * index;
rel.r_info = ((*it)->getSymbolIndex() << 8) + R_386_JMP_SLOT;
this->expandSecData((char *)&rel, sizeof(Elf32_Rel), 1);
index++;
}
}
void SCSection::setGOTData(SCSymbolListDYN *sym_list)
{
int index = 0;
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
if (!((*it)->getSymbolSdType() & SYM_GOT))
continue;
UINT8 *buffer;
buffer = (UINT8 *)malloc(0x4);
memset(buffer, 0x0, 0x4);
this->expandSecData((char *)buffer, 0x4, 1);
free(buffer);
}
}
void SCSection::setRELGOTData(SCSymbolListDYN *sym_list)
{
int index = 0;
vector<SCSymbolDYN*>::iterator it;
for (it = sym_list->getSymbolList()->begin(); it != sym_list->getSymbolList()->end(); ++it) {
if (!((*it)->getSymbolSdType() & SYM_GOT))
continue;
Elf32_Rel rel;
rel.r_offset = 0x4 * index;
rel.r_info = ((*it)->getSymbolIndex() << 8) + R_386_GLOB_DAT;
this->expandSecData((char *)&rel, sizeof(Elf32_Rel), 1);
index++;
}
}
void SCSection::setDynamicData(int number)
{
UINT8 *buffer;
int datasize;
datasize = DYNAMIC_ENTSIZE * (DYNAMIC_NUMBER + number);
buffer = (UINT8 *)malloc(datasize);
memset(buffer, 0x0, datasize);
this->expandSecData((char *)buffer, datasize, 1);
free(buffer);
}
void SCSection::setShstrData(SCSectionList *sec_list)
{
free(this->sec_data);
this->sec_data = NULL;
this->sec_datasize = 0;
vector<SCSection*>::iterator it;
for (it = sec_list->getSectionList()->begin(); it != sec_list->getSectionList()->end(); ++it) {
int length = strlen((char *)(*it)->getSecName());
(*it)->setSecNameOffset(this->sec_datasize);
this->expandSecData((char *)(*it)->getSecName(), length + 1, 1);
}
}
UINT32 SCSection::getSecOrderScore()
{
int n;
n = this->sec_misc ? 50 : 0;
n += this->getSecIndex();
/* NULL section: 0 */
if (this->sec_type == SHT_NULL)
return 0;
/* .interp 1 */
if (!strcmp((char *)this->sec_name, INTERP_SECTION_NAME))
return 1;
/* .note.ABI-tag 2 */
if (!strcmp((char *)this->sec_name, NOTE_SECTION_NAME))
return 2;
/* A: +1000 */
if (this->sec_flags == SHF_ALLOC)
return 1000 + n;
/* AX: +1000*/
if (this->sec_flags == (SHF_ALLOC | SHF_EXECINSTR))
return 1000 + n;
/* WA: + 2000 */
if (this->sec_flags == (SHF_ALLOC | SHF_WRITE))
return 2000 + n;
/* STR: +3000 */
if (this->sec_flags == SHF_STRINGS)
return 3000 + n;
/* Symbol Table: +7000 */
if (this->sec_type == SHT_SYMTAB)
return 7000 + n;
/* String Table: +8000 */
if (this->sec_type == SHT_STRTAB)
return 8000 + n;
return 6000 + n;
}
void SCSection::renewRELSection(UINT32 address)
{
int number = this->sec_datasize / this->sec_entsize;
for (int i = 0; i < number; i++) {
Elf32_Rel *cur_rel;
cur_rel = (Elf32_Rel *)(this->sec_data + this->sec_entsize * i);
cur_rel->r_offset += address;
}
}
void SCSection::renewPLTSection(UINT32 address)
{
int number = this->sec_datasize / 0x10;
UINT32 plt_sec_address, gotplt_sec_address;
plt_sec_address = this->sec_address;
gotplt_sec_address = address;
UINT32 value1, value2;
value1 = gotplt_sec_address + 4;
value2 = gotplt_sec_address + 8;
this->setSecContent(2, (char *)&value1, sizeof(UINT32));
this->setSecContent(8, (char *)&value2, sizeof(UINT32));
for (int i = 1; i < number; i++) {
int offset;
offset = i * 0x10;
UINT32 d_address;
d_address = gotplt_sec_address + 0xc + (i - 1) * 4;
this->setSecContent(offset + 2, (char *)&d_address, sizeof(UINT32));
int value;
UINT32 e_address;
e_address = plt_sec_address + 0x10 * (i + 1);
value = plt_sec_address - e_address;
this->setSecContent(offset + 0xc, (char *)&value, sizeof(int));
}
}
void SCSection::renewGOTPLTSection(UINT32 addr_dynamic, UINT32 addr_plt)
{
int number = this->sec_datasize / this->sec_entsize;
this->setSecContent(0, (char *)&addr_dynamic, sizeof(UINT32));
for (int i = 3; i < number; i++) {
int offset;
offset = i * this->sec_entsize;
UINT32 address;
address = addr_plt + (i - 3 + 1) * 0x10 + 6;
this->setSecContent(offset, (char *)&address, sizeof(UINT32));
}
}
void SCSection::renewDynamicSection(SCSectionList *sl, char *file[], int num)
{
SCSection *gotplt, *plt, *got, *dynsym, *dynstr, *relgot, *relplt, *hash;
SCSection *init, *fini, *fini_array, *init_array, *gv, *gnr;
gotplt = sl->getSectionByName(GOT_PLT_SECTION_NAME);
plt = sl->getSectionByName(PLT_SECTION_NAME);
got = sl->getSectionByName(GOT_SECTION_NAME);
dynsym = sl->getSectionByName(DYNSYM_SECTION_NAME);
relgot = sl->getSectionByName(REL_DYN_SECTION_NAME);
relplt = sl->getSectionByName(REL_PLT_SECTION_NAME);
dynstr = sl->getSectionByName(DYNSTR_SECTION_NAME);
hash = sl->getSectionByName(HASH_SECTION_NAME);
init = sl->getSectionByName(INIT_SECTION_NAME);
fini = sl->getSectionByName(FINI_SECTION_NAME);
fini_array = sl->getSectionByName(FINI_ARRAY_SECTION_NAME);
init_array = sl->getSectionByName(INIT_ARRAY_SECTION_NAME);
gv = sl->getSectionByName(GV_SECTION_NAME);
gnr = sl->getSectionByName(GNR_SECTION_NAME);
int number = sizeof(DynamicSectionInfo) / sizeof(Elf32_Dyn);
for (int i = 0; i < number; i++) {
Elf32_Dyn *dyn_item;
dyn_item = (Elf32_Dyn *)(this->sec_data + i * sizeof(Elf32_Dyn));
int tag;
tag = DynamicSectionInfo[i].d_tag;
dyn_item->d_tag = tag;
switch(tag) {
case DT_PLTGOT:
dyn_item->d_un.d_ptr = gotplt->sec_address;
break;
case DT_PLTRELSZ:
dyn_item->d_un.d_val = relplt->sec_datasize;
break;
case DT_JMPREL:
dyn_item->d_un.d_ptr = relplt->sec_address;
break;
case DT_PLTREL:
// UNFIEXED: REL IS NOT 0x11
dyn_item->d_un.d_val = 0x11;
break;
case DT_REL:
dyn_item->d_un.d_ptr = relgot->sec_address;
break;
case DT_RELSZ:
dyn_item->d_un.d_val = relgot->sec_datasize;
break;
case DT_RELENT:
// seems to be a fixed value;
dyn_item->d_un.d_val = relgot->sec_entsize;
break;
case DT_DEBUG:
dyn_item->d_un.d_ptr = 0x0;
break;
case DT_SYMTAB:
dyn_item->d_un.d_ptr = dynsym->sec_address;
break;
case DT_SYMENT:
dyn_item->d_un.d_val = dynsym->sec_entsize;
break;
case DT_STRTAB:
dyn_item->d_un.d_ptr = dynstr->sec_address;
break;
case DT_STRSZ:
dyn_item->d_un.d_val = dynstr->sec_datasize;
break;
case DT_HASH:
dyn_item->d_un.d_ptr = hash->sec_address;
break;
case DT_NEEDED:
// TODO: UNFIEXED: hard-code here
dyn_item->d_un.d_val = this->findOffset(dynstr, file[0]);
/*dyn_item->d_un.d_val = FindOffset(dynstr, "/usr/lib/libc.so.6");*/
break;
case DT_INIT:
dyn_item->d_un.d_ptr = init->sec_address;
break;
case DT_FINI:
dyn_item->d_un.d_ptr = fini->sec_address;
break;
case DT_FINI_ARRAY:
dyn_item->d_un.d_ptr = fini_array->sec_address;
break;
case DT_FINI_ARRAYSZ:
dyn_item->d_un.d_val = fini_array->sec_datasize;
break;
case DT_INIT_ARRAY:
dyn_item->d_un.d_ptr = init_array->sec_address;
break;
case DT_INIT_ARRAYSZ:
dyn_item->d_un.d_val = init_array->sec_datasize;
break;
case DT_VERSYM:
dyn_item->d_un.d_ptr = gv->sec_address;
break;
case DT_VERNEED:
dyn_item->d_un.d_ptr = gnr->sec_address;
break;
case DT_VERNEEDNUM:
// TODO: UNFIEXED: hard-code here
dyn_item->d_un.d_val = num;
break;
case DT_NULL:
dyn_item->d_un.d_val = 0x0;
break;
default:
//printf("error in finding dynamic section item\n");
cout << "error in finding dynamic section item" << endl;
break;
}
}
}
void SCSection::addPLTTop()
{
Instr instr[2];
int i, offset;
UINT8 *buffer;
buffer = (UINT8 *)malloc(0x10);
memset(buffer, 0x0, 0x10);
instr[0].opcode = 0x35ff;
instr[0].oprand = 0x0;
instr[1].opcode = 0x25ff;
instr[1].oprand = 0x0;
offset = 0;
for (i = 0; i < 2; i++) {
memcpy(buffer + offset, &(instr[i].opcode), 0x2);
offset += 2;
memcpy(buffer + offset, &(instr[i].oprand), 0x4);
offset += 4;
}
this->sec_data = buffer;
this->sec_datasize = 0x10;
}
int SCSection::findOffset(SCSection *dynstr, char *str)
{
UINT8 *data;
data = dynstr->getSecData();
int offset = 0;
while (strcmp(str, (char *)data) != 0){
data++;
offset++;
}
return offset;
}
UINT32 SCSection::calculateHash(const UINT8 *name)
{
UINT32 h = 0, g;
while (*name) {
h = (h << 4) + *name++;
if (g = h & 0xf0000000)
h ^= g >> 24;
h &= ~g;
}
return h;
}
void SCSection::expandSecData(char *data, int datasize, int flag)
{
UINT8 *buffer;
int newdatasize = this->sec_datasize + datasize;
buffer = (UINT8 *)malloc(newdatasize);
memset(buffer, 0x0, newdatasize);
if (this->sec_data)
memcpy(buffer, this->sec_data, this->sec_datasize);
memcpy(buffer + this->sec_datasize, data, datasize);
if (this->sec_data)
free(this->sec_data);
this->sec_data = buffer;
if (flag)
this->sec_datasize = newdatasize;
}
void SCSection::testSecData()
{
ofstream os;
os.open("testSec", ofstream::binary);
os.write((const char*)this->sec_data, this->sec_datasize);
os.close();
}
void SCSectionList::init(SCFile &file)
{
Elf32_Shdr *cur_sec_dr;
UINT8 *sec_strn_table, *file_data;
sec_strn_table = file.getSectionStrnTable();
file_data = file.getFileData();
SCSection *sec;
for (int i = 0; i < file.getSectionNumber(); i++) {
cur_sec_dr = file.getSectionTable() + i;
sec = new SCSection(cur_sec_dr, i);
sec->init(file_data, sec_strn_table);
this->sec_list.push_back(sec);
}
}
SCSection* SCSectionList::getSectionByName(const char *name)
{
vector<SCSection*>::iterator it;
for (it = this->sec_list.begin(); it != this->sec_list.end(); ++it) {
UINT8 *sec_name = (*it)->getSecName();
if (!strcmp((const char*)sec_name, name))
return *it;
}
return NULL;
}
SCSection *SCSectionList::getSectionByIndex(const int index)
{
vector<SCSection*>::iterator it;
for (it = this->sec_list.begin(); it != this->sec_list.end(); ++it) {
if ((*it)->getSecIndex() == index)
return *it;
}
return NULL;
}
/* The object is the list of sections deleted from parameter sl*/
void SCSectionList::mergeSections(SCSectionList *sl)
{
int i = 0;
SCSection *text;
text = sl->getSectionByName(".text");
vector<SCSection*>::iterator it;
for (it = sl->sec_list.begin(); it != sl->sec_list.end(); ++it) {
SCSection *cur_sec, *last_sec;
if ((*it)->sec_flags & SHF_MERGE) {
if (!strcmp((const char *)(*it)->sec_name, ".comment")) {
continue;
}
else {
SCSection *sec = (*(it-1))->mergeSection(*it);
this->sec_list.push_back(*it);
sl->sec_list.erase(it);
--it;
}
}
if ((*it)->sec_flags & SHF_EXECINSTR && !this->skipXSection((*it)->sec_name)) {
SCSection *sec = text->mergeSection(*it);
this->sec_list.push_back(*it);
sl->sec_list.erase(it);
--it;
}
}
}
void SCSectionList::addOneXSection(Elf32_Shdr *sec_shdr, char *name, char *data, int datasize)
{
SCSection *sec, *text;
sec = this->addOneSection(sec_shdr, name, data, datasize);
text = this->getSectionByName(TEXT_SECTION_NAME);
sec->setSecInitIndex(text->getSecIndex() + 1);
sec->setSecMisc(sec->getSecIndex());
}
SCSection *SCSectionList::addOneSection(Elf32_Shdr *sec_shdr, char *name, char *data, int datasize)
{
vector<SCSection*>::iterator it = this->sec_list.end();
int index = (*--it)->getSecIndex() + 1;
SCSection *sec = new SCSection(sec_shdr, index);
sec->setSecName((const char *)name);
sec->expandSecData(data, datasize, 1);
this->sec_list.push_back(sec);
return sec;
}
void SCSectionList::createSections()
{
vector<SCSection*>::iterator it = this->sec_list.end();
int index = (*--it)->getSecIndex() + 1;
for (int i = 0; i < ADDEDSECTIONNUMBER; i++) {
SCSection *sec = new SCSection(AddedSectionsInfo + i, index + i);
sec->setSecName((const char *)(AddedSectionsName[i]));
/* Reset the misc of new sections to 0 */
sec->setSecMisc(0);
this->sec_list.push_back(sec);
}
}
void SCSectionList::addSections(const char *ld_file, SCSymbolListDYN *sym_list, char **so_files, int number)
{
this->createSections();
vector<SCSection*>::iterator it;
SCSection *dynstr, *init;
dynstr = this->getSectionByName(DYNSTR_SECTION_NAME);
dynstr->setDynstrData(sym_list, so_files, number);
init = this->getSectionByName(INIT_SECTION_NAME);
for (it = this->sec_list.begin(); it != this->sec_list.end(); ++it) {
if (!strcmp((const char *)(*it)->getSecName(), INTERP_SECTION_NAME)) {
(*it)->setInterpData(ld_file);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), DYNSYM_SECTION_NAME)) {
(*it)->setDynsymData(sym_list);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), HASH_SECTION_NAME)) {
(*it)->setHashData(sym_list);
(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), GV_SECTION_NAME)) {
(*it)->setGVData(sym_list);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), GNR_SECTION_NAME)) {
(*it)->setGNRData(sym_list, so_files, number, dynstr);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), PLT_SECTION_NAME)) {
(*it)->setPLTData(sym_list);
/* Modify the PLT misc and index here
* Used when get the section score*/
(*it)->setSecMisc(init->getSecMisc());
(*it)->setSecInitIndex(init->getSecIndex());
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), GOT_PLT_SECTION_NAME)) {
(*it)->setGOTPLTData(sym_list);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), REL_PLT_SECTION_NAME)) {
(*it)->setRELPLTData(sym_list);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), GOT_SECTION_NAME)) {
(*it)->setGOTData(sym_list);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), REL_DYN_SECTION_NAME)) {
(*it)->setRELGOTData(sym_list);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), DYNAMIC_SECTION_NAME)) {
(*it)->setDynamicData(number);
//(*it)->testSecData();
}
if (!strcmp((const char *)(*it)->getSecName(), SHSTRTAB_SECTION_NAME)) {
(*it)->setShstrData(this);
//(*it)->testSecData();
}
}
}
void SCSectionList::allocateSectionsAddress(int flag)
{
UINT32 base_addr, offset;
base_addr = 0x8048000;
offset = 0x114;
UINT32 addend = 0;
this->sortSections(flag);
vector<SCSection*>::iterator it;
for (it = this->sec_list.begin() + 1; it != this->sec_list.end(); ++it) {
UINT32 align = 1;
align = (*it)->getSecAlign() ? (*it)->getSecAlign() : 1;
int addition = 0;
while ((offset + addition) % align != 0)
addition++;
if (addition) {
UINT8 *buffer;
buffer = (UINT8 *)malloc(addition);
memset(buffer, 0x0, addition);
(*it)->expandSecData((char *)buffer, addition, 0);
free(buffer);
offset += addition;
}
if ((*it)->getSecFlags() & SHF_WRITE)
addend = 0x1000;
if ((*it)->getSecFlags() & SHF_ALLOC)
(*it)->setSecAddress(base_addr + offset + addend);
else
(*it)->setSecAddress(0);
(*it)->setSecFileOffset(offset);
if (strcmp((char *)(*it)->getSecName(), BSS_SECTION_NAME))
offset += (*it)->getSecDatasize();
}
}
void SCSectionList::renewSectionsInfo(char *file[], int num)
{
SCSection *dynamic, *gotplt, *plt, *got, *dynsym, *dynstr, *relgot, *relplt, *hash;
SCSection *init, *fini, *fini_array, *init_array, *gv, *gnr;
SCSection *interp, *symtab, *strtab;
dynamic = this->getSectionByName(DYNAMIC_SECTION_NAME);
gotplt = this->getSectionByName(GOT_PLT_SECTION_NAME);
plt = this->getSectionByName(PLT_SECTION_NAME);
got = this->getSectionByName(GOT_SECTION_NAME);
dynsym = this->getSectionByName(DYNSYM_SECTION_NAME);
relgot = this->getSectionByName(REL_DYN_SECTION_NAME);
relplt = this->getSectionByName(REL_PLT_SECTION_NAME);
dynstr = this->getSectionByName(DYNSTR_SECTION_NAME);
hash = this->getSectionByName(HASH_SECTION_NAME);
init = this->getSectionByName(INIT_SECTION_NAME);
fini = this->getSectionByName(FINI_SECTION_NAME);
fini_array = this->getSectionByName(FINI_ARRAY_SECTION_NAME);
init_array = this->getSectionByName(INIT_ARRAY_SECTION_NAME);
gv = this->getSectionByName(GV_SECTION_NAME);
gnr = this->getSectionByName(GNR_SECTION_NAME);
interp = this->getSectionByName(INTERP_SECTION_NAME);
symtab = this->getSectionByName(SYMTAB_SECTION_NAME);
strtab = this->getSectionByName(STRTAB_SECTION_NAME);
gv->setSecInfo(interp->getSecIndex());
dynsym->setSecInfo(interp->getSecIndex());
relplt->setSecInfo(plt->getSecIndex());
hash->setSecLink(dynsym->getSecIndex());
gv->setSecLink(dynsym->getSecIndex());
relgot->setSecLink(dynsym->getSecIndex());
relplt->setSecLink(dynsym->getSecIndex());
dynamic->setSecLink(dynstr->getSecIndex());
gnr->setSecLink(dynstr->getSecIndex());
dynsym->setSecLink(dynstr->getSecIndex());
symtab->setSecLink(strtab->getSecIndex());
vector<SCSection*>::iterator it;
for (it = this->sec_list.begin(); it != this->sec_list.end(); ++it) {
if (!strcmp((const char *)(*it)->getSecName(), REL_DYN_SECTION_NAME)) {
(*it)->renewRELSection(got->getSecAddress());
}
if (!strcmp((const char *)(*it)->getSecName(), REL_PLT_SECTION_NAME)) {
(*it)->renewRELSection(gotplt->getSecAddress());
}
if (!strcmp((const char *)(*it)->getSecName(), PLT_SECTION_NAME)) {
(*it)->renewPLTSection(gotplt->getSecAddress());
}
if (!strcmp((const char *)(*it)->getSecName(), GOT_PLT_SECTION_NAME)) {
(*it)->renewGOTPLTSection(dynamic->getSecAddress(), plt->getSecAddress());
}
if (!strcmp((const char *)(*it)->getSecName(), DYNAMIC_SECTION_NAME)) {
(*it)->renewDynamicSection(this, file, num);
}
}
}
/* flag: 1, skip the rel sections
* flag: 0, don't skip the rel sections */
void SCSectionList::sortSections(int flag)
{
int number_sections = 0;
vector<SCSection*>::iterator it;
/* delete the dump relocation sections and calculate section number*/
for (it = this->sec_list.begin(); it != this->sec_list.end(); ++it) {
if ((*it)->getSecType() == SHT_REL && (*it)->getSecMisc() != 0 && flag) {
this->sec_list.erase(it);
--it;
continue;
}
(*it)->setSecMisc((*it)->getSecOrderScore());
number_sections++;
}
SCSection **list;
list = (SCSection **)malloc(sizeof(SCSection *) * number_sections);
number_sections = 0;
for (it = this->sec_list.begin(); it != this->sec_list.end(); ++it) {