面向Linux的内核级代码复用攻击检测技术

近年来,代码复用攻击与防御成为安全领域研究的热点.内核级代码复用攻击使用内核自身代码绕过传统的防御机制.现有的代码复用攻击检测与防御方法多面向应用层代码复用攻击,忽略了内核级代码复用攻击.为有效检测内核级代码复用攻击,提出了一种基于细粒度控制流完整性（CFI）的检测方法.首先根据代码复用攻击原理和正常程序控制流构建CFI约束规则,然后提出了基于状态机和CFI约束规则的检测模型.在此基础上,基于编译器辅助实现CFI标签指令插桩,并在Hypervisor中实现CFI约束规则验证,提高了检测方法的安全性.实验结果表明该方法能够有效检测内核级代码复用攻击,并且性能开销不超过60%.

Kernel Code Reuse Attack Detection Technique for Linux

Recently, code reuse attack and defensive techniques have been a hot area in the security field. Kernel-level code reuse attacks use kernel code to bypass traditional defensive mechanisms. And existing code reuse attacks detection and defensive methods mainly focus on user-level code reuse attacks, ignoring kernel-level code reuse attacks. In order to detect kernel-level code reuse attacks effectively, a detection method based on fine-grained control flow integrity (CFI) is proposed. Firstly, CFI constraint rules are constructed according to the code reuse attack principles and the control flows of normal programs. After that, a detection model based on state machine and CFI constraint rules is proposed. On this basis, CFI label checking instructions are instrumented based on GCC-plugin. And CFI constraint rules are verified on the Hypervisor, which promotes the security of the method. The experiment results show that this method can effectively detect kernel-level code reuse attacks, and performance evaluations indicate that performance penalty induced by this method is less than 60%.