CodeQL C++ virtual tables test

Makefile

CXX := g++
CXX := ${CXX}

.PHONY: clean

all:	vtables.cpp
	$(CXX) -o vtables vtables.cpp

clean:
	rm -f vtables

vtables.cpp

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>

/**********************
 * CLASS - BaseClass  *
 **********************/

class BaseClass {
    public:
        char cmd[1024];
        virtual void doSystemCall();
        virtual void initializeCommand(char *ncmd);
};

void BaseClass::doSystemCall() {
    std::cout << cmd << std::endl;
    std::system(cmd);
}

void BaseClass::initializeCommand(char *ncmd) {
    std::strcpy(cmd, ncmd);
}

/**********************
 * CLASS - DerivClass *
 **********************/

class DerivClass : public BaseClass {
    public:
        void initializeCommand(char *ncmd) override;
};

void DerivClass::initializeCommand(char *ncmd) {
    std::strcat(cmd, "/bin/sh -c ");
    std::strcat(cmd, ncmd);
}

/**********************
 *        CODE        *
 **********************/

int main() {
    char buf[512];
    std::fgets(buf, 512, stdin);
    
    BaseClass* caller = new DerivClass();
    caller->initializeCommand(buf);
    caller->doSystemCall();
    
    return 0;
}