返回导向式编程(ROP)是一种可有效绕过数据执行保护(DEP)机制的技术． 已 有的 ROP 自动构造技术缺少对 ROP 模块转换过程的静态指令分配的优化，导致 ROP 载 荷需占用大量内存空间． 为解决这一问题，基于已有的 ROP 自动构造系统 Q，针对多模块 ROP 的模块转换过程，设计了新的静态指令分配规则 SIA． SIA 通过静态指令分配，构造 中间指令序列;通过动态数据填充，实现 ROP 模块转换过程中的寻址与指针修改． 实验表 明，相比已有技术，通过 SIA 规则构造的多模块 ROP 载荷降低了内存空间占有率，提高了 ROP 载荷的实用性．

Return Oriented Programming (ROP) is a kind of technology to bypass the Data Execution Prevention (DEP)． Existing technologies for automatic ROP generation can not optimize the progress of instructions assign- ment for modules switching in multi-modules ROP payload，leading to the problem of large amounts of memory space are occupied． In order to solve this problem，a new static instructions assignment rule SIA for ROP modules switching was designed based on the automatic ROP generation system Q． SIA constructs intermediate sequence of instructions by static instructions assignment，and finds the address and modifies the pointers by dynamic data fill- ing． Experimental results show that，compared with the existing technologies，the multi-modules ROP payload gen- erated by SIA needs less memory space so that improve the practicability of ROP．