我想使用英特尔PIN（主要是为了获取数组写入信息）来检测像mov dword ptr [rbp-0x28], 0x7（所以mov dword ptr [rbp-0xxx], xxx格式的所有指令）这样的指令。在未优化的代码中，这应该使大多数存储到局部变量。
我可以：
if (INS_Opcode(ins) == XED_ICLASS_MOV)
instruction detection;
检测mov指令。但是，同时它还会检测其他指令，例如mov eax, 0x0。我想用dword ptr size指令检测指令。
我检查了针指令检查API和pin xed-iclass-enum。使用该文档我尝试了类似的东西：
if ((INS_Opcode(ins) == XED_ICLASS_MOV) && INS_OperandIsMemory(ins, 0))
instruction detection;
这给了我想要的结果。但也给了我像mov esi, eax（我不想要的）的指示。
我的代码：
#include <fstream>
#include <iostream>
#include "pin.H"
#include <stack>
#include <unordered_map>
// Additional library calls go here
// Stack allocation
struct Node
{
int value;
};
std::stack<Node> mainStack;
// Ins object mapping
class Insr
{
private:
INS insobject;
public:
Insr(INS insob)
{
insobject = insob;
}
INS get_insobject()
{
return insobject;
}
};
static std::unordered_map<ADDRINT, Insr*> insstack;
// Output file object
ofstream OutFile;
//static uint64_t counter = 0;
std::string rtin = "";
// Make this lock if you want to print from _start
uint32_t key = 0;
void printmaindisas(uint64_t addr, std::string disassins)
{
std::stringstream tempstream;
tempstream << std::hex << addr;
std::string address = tempstream.str();
// if (addr > 0x700000000000)
// return;
if (addr > 0x700000000000)
return;
if (!key)
return;
// if (insstack[addr]->get_opcode() == XED_ICLASS_ADD || insstack[addr]->get_opcode()
// == XED_ICLASS_SUB)
INS ins = insstack[addr]->get_insobject();
if((INS_Opcode(ins) == XED_ICLASS_ADD || INS_Opcode(ins) == XED_ICLASS_SUB)
&&(INS_OperandIsImmediate(ins, 1)))
{
int value = INS_OperandImmediate(ins, 1);
std::cout << "value: " << value << '\n';
Node node{value};
mainStack.push(node);
std::cout << "stack top: " << mainStack.top().value << '\n';
}
if ((INS_Opcode(ins) == XED_ICLASS_MOV) && INS_OperandIsMemory(ins, 0))
{
std::cout << "yes!" << '\n';
}
std::cout<<address<<"\t"<<disassins<<std::endl;
}
void mutex_lock()
{
key = 0;
std::cout<<"out\n";
}
void mutex_unlock()
{
key = 1;
std::cout<<"in\n";
}
void Instruction(INS ins, VOID *v)
{
insstack.insert(std::make_pair(INS_Address(ins), new Insr(ins)));
INS_InsertCall(ins, IPOINT_BEFORE, (AFUNPTR)printmaindisas, IARG_ADDRINT, INS_Address(ins),
IARG_PTR, new string(INS_Disassemble(ins)), IARG_END);
}
void Routine(RTN rtn, VOID *V)
{
if (RTN_Name(rtn) == "main")
{
//std::cout<<"Loading: "<<RTN_Name(rtn) << endl;
RTN_Open(rtn);
RTN_InsertCall(rtn, IPOINT_BEFORE, (AFUNPTR)mutex_unlock, IARG_END);
RTN_InsertCall(rtn, IPOINT_AFTER, (AFUNPTR)mutex_lock, IARG_END);
RTN_Close(rtn);
}
}
KNOB<string> KnobOutputFile(KNOB_MODE_WRITEONCE, "pintool", "o", "mytool.out", "specify output file name");
/*
VOID Fini(INT32 code, VOID *v)
{
// Write to a file since cout and cerr maybe closed by the application
OutFile.setf(ios::showbase);
OutFile << "Count " << count << endl;
OutFile.close();
}
*/
int32_t Usage()
{
cerr << "This is my custom tool" << endl;
cerr << endl << KNOB_BASE::StringKnobSummary() << endl;
return -1;
}
int main(int argc, char * argv[])
{
// It must be called for image instrumentation
// Initialize the symbol table
PIN_InitSymbols();
// Initialize pin
// PIN_Init must be called before PIN_StartProgram
// as mentioned in the documentation
if (PIN_Init(argc, argv)) return Usage();
// Open the output file to write
OutFile.open(KnobOutputFile.Value().c_str());
// Set instruction format as intel
// Not needed because my machine is intel
PIN_SetSyntaxIntel();
RTN_AddInstrumentFunction(Routine, 0);
// Add an isntruction instrumentation
INS_AddInstrumentFunction(Instruction, 0);
//PIN_AddFiniFunction(Fini, 0);
// Start the program here
PIN_StartProgram();
return 0;
}
我得到的输出：
in
40051e push rbp
value: -128
stack top: -128
40051f mov rbp, rsp
400522 add rsp, 0xffffffffffffff80
yes!
400526 mov dword ptr [rbp-0x28], 0x7
yes!
40052d mov dword ptr [rbp-0x64], 0x9
400534 mov eax, 0x0
400539 call 0x4004e6
4004e6 push rbp
value: 64
stack top: 64
4004e7 mov rbp, rsp
4004ea sub rsp, 0x40
yes!
4004ee mov dword ptr [rbp-0xc], 0x4
4004f5 lea rax, ptr [rbp-0xc]
yes!
4004f9 mov qword ptr [rbp-0x8], rax
4004fd mov rax, qword ptr [rbp-0x8]
400501 mov eax, dword ptr [rax]
yes!
400503 mov esi, eax
400505 mov edi, 0x4005d0
40050a mov eax, 0x0
40050f call 0x4003f0
4003f0 jmp qword ptr [rip+0x200c22]
4003f6 push 0x0
4003fb jmp 0x4003e0
4003e0 push qword ptr [rip+0x200c22]
4003e6 jmp qword ptr [rip+0x200c24]
4
yes!
400514 mov dword ptr [rbp-0x3c], 0x3
40051b nop
40051c leave
40051d ret
40053e mov eax, 0x0
400543 leave
out
这是正确的方法吗（没有任何误报）？如果是这样，请你帮帮我？
如果您想接受以下所有说明：
mov [rbp + disp], reg/imm
mov [rbp*scale + disp], reg/imm
mov [reg + rbp*scale], reg/imm
mov [rbp + reg*scale + disp], reg/imm
那么你需要执行以下检查：
if (INS_Opcode(ins) == XED_ICLASS_MOV && // Check that the instruction is MOV.
INS_OperandIsMemory(ins, 0) && // Check that the destination operand is a memory operand.
INS_OperandWidth(ins, 0) == 32 && // Check that the size of the operand is 32 bits.
(INS_OperandMemoryBaseReg(ins, 0) == REG_EBP ||
INS_OperandMemoryIndexReg(ins, 0) == REG_EBP)) // Check that the base or index register is RBP.
{
...
}
请注意，这些检查接受具有位移的MOV指令（包括零位移）和没有位移的MOV指令（在语义上等效于零位移但编码不同）。
我假设您希望接受RBP作为基址寄存器或索引寄存器（可能具有大于1的标度）。注意，在RBP用作基址寄存器的情况下，指令的编码将始终包括位移。见：Why are rbp and rsp called general purpose registers?。
如果要接受以下所有使用RBP作为基址寄存器的指令：
mov [rbp + disp], reg/imm
mov [rbp + reg*scale + disp], reg/imm
那么你需要执行以下检查：
if (INS_Opcode(ins) == XED_ICLASS_MOV && // Check that the instruction is MOV.
INS_OperandIsMemory(ins, 0) && // Check that the destination operand is a memory operand.
INS_OperandWidth(ins, 0) == 32 && // Check that the size of the operand is 32 bits.
INS_OperandMemoryBaseReg(ins, 0) == REG_EBP) // Check that the base is RBP.
{
...
}
如果您只想接受以下说明：
mov [rbp + disp], reg/imm
那么你需要执行以下检查：
if (INS_Opcode(ins) == XED_ICLASS_MOV && // Check that the instruction is MOV.
INS_OperandIsMemory(ins, 0) && // Check that the destination operand is a memory operand.
INS_OperandWidth(ins, 0) == 32 && // Check that the size of the operand is 32 bits.
INS_OperandMemoryBaseReg(ins, 0) == REG_EBP && // Check that the base is RBP.
INS_OperandMemoryIndexReg(ins, 0) == REG_INVALID()) // Check that there is no index register.
{
...
}
如果要检查位移是否为负数，请使用以下检查：
INS_OperandMemoryDisplacement(ins, 0) < 0
请注意，INS_OperandMemoryDisplacement不区分没有位移的内存操作数和位移为零的内存操作数。如果没有位移，它只返回零。如果要确定指令编码是否实际包含位移字段，则应使用XED API。