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Exploitation of heap vulnerabilities has been on the rise, leading to manydevastating attacks. Conventional heap patch generation is a lengthy procedure,requiring intensive manual efforts. Worse, fresh patches tend to harm systemdependability, hence deterring users from deploying them. We propose a heappatching system that simultaneously has the following prominent advantages: (1)generating patches without manual efforts; (2) installing patches withoutaltering the code (so called code-less patching); (3) handling various heapvulnerability types; (4) imposing a very low overhead; and (5) no dependency onspecific heap allocators. As a separate contribution, we propose targetedcalling context encoding, which is a suite of algorithms for optimizing callingcontext encoding, an important technique with applications in many areas. Thesystem properly combines heavyweight offline attack analysis with lightweightonline defense generation, and provides a new countermeasure against heapattacks. The evaluation shows that the system is effective and efficient.

Code-less Patching for Heap Vulnerabilities Using Targeted Calling Context Encoding