feat : implment

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+project(LDPathHackDemo)
+
+add_subdirectory(real_lib)
+add_subdirectory(fake_lib)
+add_subdirectory(victim)

README.md

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+# 빌드
+mkdir build && cd build
+cmake ..
+cmake --build .
+
+# 정상 실행
+./victim/victim
+
+# 가짜 라이브러리 우선 경로 설정
+mv real_lib/libmylib.so real_lib/libmylib_
+LD_LIBRARY_PATH=./fake_lib ./victim/victim

fake_lib/CMakeLists.txt

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+add_library(mylib_fake SHARED mylib.cpp)
+set_target_properties(mylib_fake PROPERTIES OUTPUT_NAME mylib)

fake_lib/mylib.cpp

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+#include <iostream>
+void greet() {
+    std::cout << "❌ HACKED: This is the fake library!" << std::endl;
+}

real_lib/CMakeLists.txt

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+add_library(mylib SHARED mylib.cpp)
+set_target_properties(mylib PROPERTIES OUTPUT_NAME mylib)

real_lib/mylib.cpp

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+#include <iostream>
+void greet() {
+    std::cout << "✅ Hello from the real library!" << std::endl;
+}

victim/CMakeLists.txt

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+add_executable(victim main.cpp)
+target_include_directories(victim PRIVATE ${CMAKE_SOURCE_DIR}/victim)
+target_link_libraries(victim PRIVATE mylib)

victim/main.cpp

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+#include "mylib.h"
+
+int main() {
+    greet();
+    return 0;
+}

victim/mylib.h

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+#pragma once
+void greet();