我想知道如何更改地址Test
它在虚拟表中HackedVTable
.
void HackedVtable()
{
cout << "Hacked V-Table" << endl;
}
class Base
{
public:
virtual Test() { cout <<"base"; }
virtual Test1() { cout << "Test 1"; }
void *prt;
Base(){}
};
class Derived : public Base
{
public:
Test()
{
cout <<"derived";
}
};
int main()
{
Base b1;
b1.Test(); // how to change this so that `HackedVtable` should be called instead of `Test`?
return 0;
}
这适用于 32 位 MSVC 构建(它是一些已使用一年多的生产代码的非常简化的版本)。请注意,您的替换方法必须明确指定this
参数(指针)。
// you can get the VTable location either by dereferencing the
// first pointer in the object or by analyzing the compiled binary.
unsigned long VTableLocation = 0U;
// then you have to figure out which slot the function is in. this is easy
// since they're in the same order as they are declared in the class definition.
// just make sure to update the index if 1) the function declarations are
// re-ordered and/or 2) virtual methods are added/removed from any base type.
unsigned VTableOffset = 0U;
typedef void (__thiscall Base::*FunctionType)(const Base*);
FunctionType* vtable = reinterpret_cast<FunctionType*>(VTableLocation);
bool hooked = false;
HANDLE process = ::GetCurrentProcess();
DWORD protection = PAGE_READWRITE;
DWORD oldProtection;
if ( ::VirtualProtectEx( process, &vtable[VTableOffset], sizeof(int), protection, &oldProtection ) )
{
vtable[VTableOffset] = static_cast<FunctionType>(&ReplacementMethod);
if ( ::VirtualProtectEx( process, &vtable[VTableOffset], sizeof(int), oldProtection, &oldProtection ) )
hooked = true;
}
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