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mytaint.cpp
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mytaint.cpp
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//
// Jonathan Salwan - Copyright (C) 2013-08
//
// http://shell-storm.org
// http://twitter.com/JonathanSalwan
//
// Note: Example 2 - http://shell-storm.org/blog/Taint-analysis-with-Pin/
// Spread the taint in memory and registers.
//
#include "pin.H"
#include <asm/unistd.h>
#include <fstream>
#include <iostream>
#include <list>
std::list<UINT64> addressTainted;
std::list<REG> regsTainted;
INT32 Usage()
{
cerr << "Ex 2" << endl;
return -1;
}
bool checkAlreadyRegTainted(REG reg)
{
list<REG>::iterator i;
for(i = regsTainted.begin(); i != regsTainted.end(); i++){
if (*i == reg){
return true;
}
}
return false;
}
VOID removeMemTainted(UINT64 addr)
{
addressTainted.remove(addr);
std::cout << std::hex << "\t\t\t" << addr << " is now freed" << std::endl;
}
VOID addMemTainted(UINT64 addr)
{
addressTainted.push_back(addr);
std::cout << std::hex << "\t\t\t" << addr << " is now tainted" << std::endl;
}
bool taintReg(REG reg)
{
if (checkAlreadyRegTainted(reg) == true){
std::cout << "\t\t\t" << REG_StringShort(reg) << " is already tainted"
<< std::endl;
return false;
}
switch(reg){
case REG_RAX: regsTainted.push_front(REG_RAX);
case REG_EAX: regsTainted.push_front(REG_EAX);
case REG_AX: regsTainted.push_front(REG_AX);
case REG_AH: regsTainted.push_front(REG_AH);
case REG_AL: regsTainted.push_front(REG_AL);
break;
case REG_RBX: regsTainted.push_front(REG_RBX);
case REG_EBX: regsTainted.push_front(REG_EBX);
case REG_BX: regsTainted.push_front(REG_BX);
case REG_BH: regsTainted.push_front(REG_BH);
case REG_BL: regsTainted.push_front(REG_BL);
break;
case REG_RCX: regsTainted.push_front(REG_RCX);
case REG_ECX: regsTainted.push_front(REG_ECX);
case REG_CX: regsTainted.push_front(REG_CX);
case REG_CH: regsTainted.push_front(REG_CH);
case REG_CL: regsTainted.push_front(REG_CL);
break;
case REG_RDX: regsTainted.push_front(REG_RDX);
case REG_EDX: regsTainted.push_front(REG_EDX);
case REG_DX: regsTainted.push_front(REG_DX);
case REG_DH: regsTainted.push_front(REG_DH);
case REG_DL: regsTainted.push_front(REG_DL);
break;
case REG_RDI: regsTainted.push_front(REG_RDI);
case REG_EDI: regsTainted.push_front(REG_EDI);
case REG_DI: regsTainted.push_front(REG_DI);
case REG_DIL: regsTainted.push_front(REG_DIL);
break;
case REG_RSI: regsTainted.push_front(REG_RSI);
case REG_ESI: regsTainted.push_front(REG_ESI);
case REG_SI: regsTainted.push_front(REG_SI);
case REG_SIL: regsTainted.push_front(REG_SIL);
break;
default:
std::cout << "\t\t\t" << REG_StringShort(reg)
<< " can't be tainted" << std::endl;
return false;
}
std::cout << "\t\t\t" << REG_StringShort(reg) << " is now tainted"
<< std::endl;
return true;
}
bool removeRegTainted(REG reg)
{
switch(reg){
case REG_RAX: regsTainted.remove(REG_RAX);
case REG_EAX: regsTainted.remove(REG_EAX);
case REG_AX: regsTainted.remove(REG_AX);
case REG_AH: regsTainted.remove(REG_AH);
case REG_AL: regsTainted.remove(REG_AL);
break;
case REG_RBX: regsTainted.remove(REG_RBX);
case REG_EBX: regsTainted.remove(REG_EBX);
case REG_BX: regsTainted.remove(REG_BX);
case REG_BH: regsTainted.remove(REG_BH);
case REG_BL: regsTainted.remove(REG_BL);
break;
case REG_RCX: regsTainted.remove(REG_RCX);
case REG_ECX: regsTainted.remove(REG_ECX);
case REG_CX: regsTainted.remove(REG_CX);
case REG_CH: regsTainted.remove(REG_CH);
case REG_CL: regsTainted.remove(REG_CL);
break;
case REG_RDX: regsTainted.remove(REG_RDX);
case REG_EDX: regsTainted.remove(REG_EDX);
case REG_DX: regsTainted.remove(REG_DX);
case REG_DH: regsTainted.remove(REG_DH);
case REG_DL: regsTainted.remove(REG_DL);
break;
case REG_RDI: regsTainted.remove(REG_RDI);
case REG_EDI: regsTainted.remove(REG_EDI);
case REG_DI: regsTainted.remove(REG_DI);
case REG_DIL: regsTainted.remove(REG_DIL);
break;
case REG_RSI: regsTainted.remove(REG_RSI);
case REG_ESI: regsTainted.remove(REG_ESI);
case REG_SI: regsTainted.remove(REG_SI);
case REG_SIL: regsTainted.remove(REG_SIL);
break;
default:
return false;
}
std::cout << "\t\t\t" << REG_StringShort(reg) << " is now freed" << std::endl;
return true;
}
VOID ReadMem(INS ins, UINT64 memOp)
{
list<UINT64>::iterator i;
UINT64 addr = memOp;
REG reg_r;
if (INS_OperandCount(ins) != 2)
return;
reg_r = INS_OperandReg(ins, 0);
for(i = addressTainted.begin(); i != addressTainted.end(); i++){
if (addr == *i){
std::cout << std::hex << "[READ in " << addr << "]\t"
<< INS_Address(ins) << ": " << INS_Disassemble(ins) << std::endl;
taintReg(reg_r);
return ;
}
}
if (checkAlreadyRegTainted(reg_r)){
std::cout << std::hex << "[READ in " << addr << "]\t"
<< INS_Address(ins) << ": " << INS_Disassemble(ins) << std::endl;
removeRegTainted(reg_r);
}
}
VOID WriteMem(INS ins, UINT64 memOp, UINT64 pc)
{
list<UINT64>::iterator i;
UINT64 addr = memOp;
REG reg_r = INS_RegR(ins, 0);
if (pc == 0x80484c1) {
std::cout << "Tainting init Reg!\n";
taintReg(reg_r);
addMemTainted(addr);
}
if (INS_OperandCount(ins) != 2)
return;
reg_r = INS_OperandReg(ins, 1);
for(i = addressTainted.begin(); i != addressTainted.end(); i++){
if (addr == *i){
std::cout << std::hex << "[WRITE in " << addr << "]\t"
<< INS_Address(ins) << ": " << INS_Disassemble(ins) << std::endl;
if (!REG_valid(reg_r) || !checkAlreadyRegTainted(reg_r))
removeMemTainted(addr);
return ;
}
}
if (checkAlreadyRegTainted(reg_r)){
std::cout << std::hex << "[WRITE in " << addr << "]\t"
<< INS_Address(ins) << ": " << INS_Disassemble(ins) << std::endl;
addMemTainted(addr);
}
}
VOID spreadRegTaint(INS ins)
{
REG reg_r, reg_w;
if (INS_OperandCount(ins) != 2)
return;
reg_r = INS_RegR(ins, 0);
reg_w = INS_RegW(ins, 0);
if (REG_valid(reg_w)){
if (checkAlreadyRegTainted(reg_w) && (!REG_valid(reg_r) ||
!checkAlreadyRegTainted(reg_r))){
std::cout << "[SPREAD]\t\t" << INS_Address(ins) << ": "
<< INS_Disassemble(ins) << std::endl;
std::cout << "\t\t\toutput: "<< REG_StringShort(reg_w)
<< " | input: "
<< (REG_valid(reg_r) ? REG_StringShort(reg_r) : "constant")
<< std::endl;
removeRegTainted(reg_w);
}
else if (!checkAlreadyRegTainted(reg_w)
&& checkAlreadyRegTainted(reg_r)){
std::cout << "[SPREAD]\t\t" << INS_Address(ins) << ": "
<< INS_Disassemble(ins) << std::endl;
std::cout << "\t\t\toutput: " << REG_StringShort(reg_w)
<< " | input: "<< REG_StringShort(reg_r) << std::endl;
taintReg(reg_w);
}
}
}
VOID Instruction(INS ins, VOID *v)
{
if (INS_IsNop(ins)) {
return;
}
if (INS_OperandCount(ins) > 1 && INS_MemoryOperandIsRead(ins, 0)
&& INS_OperandIsReg(ins, 0)){
INS_InsertCall(
ins, IPOINT_BEFORE, (AFUNPTR)ReadMem,
IARG_PTR, ins,
IARG_MEMORYOP_EA, 0,
IARG_END);
}
else if (INS_OperandCount(ins) > 1 && INS_MemoryOperandIsWritten(ins, 0)){
INS_InsertCall(
ins, IPOINT_BEFORE, (AFUNPTR)WriteMem,
IARG_PTR, ins,
IARG_MEMORYOP_EA, 0,
IARG_INST_PTR,
IARG_END);
}
else if (INS_OperandCount(ins) > 1 && INS_OperandIsReg(ins, 0)){
INS_InsertCall(
ins, IPOINT_BEFORE, (AFUNPTR)spreadRegTaint,
IARG_PTR, ins,
IARG_END);
}
}
static unsigned int tryksOpen;
#define TRICKS(){if (tryksOpen++ == 0)return;}
VOID Syscall_entry(THREADID thread_id, CONTEXT *ctx, SYSCALL_STANDARD std, void *v)
{
unsigned int i;
UINT64 start, size;
if (PIN_GetSyscallNumber(ctx, std) == __NR_read){
TRICKS(); /* tricks to ignore the first open */
start = static_cast<UINT64>((PIN_GetSyscallArgument(ctx, std, 1)));
size = static_cast<UINT64>((PIN_GetSyscallArgument(ctx, std, 2)));
for (i = 0; i < size; i++)
addressTainted.push_back(start+i);
std::cout << "[TAINT]\t\t\tbytes tainted from " << std::hex << "0x"
<< start << " to 0x" << start+size << " (via read)"<< std::endl;
}
}
int main(int argc, char *argv[])
{
if(PIN_Init(argc, argv)){
return Usage();
}
PIN_SetSyntaxIntel();
// PIN_AddSyscallEntryFunction(Syscall_entry, 0);
INS_AddInstrumentFunction(Instruction, 0);
PIN_StartProgram();
return 0;
}