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July 15, 2019, 02:00 PM
Xiaowan Dong: Toward Efficient and Protected Address Translation in Memory Management

[Monday, July 15, 2019 at 2:00 PM in Wegmans Hall 2506] Monday, July 15, 2019 2:00 PM 2506 Wegmans Hall PhD Thesis Defense Xiaowan Dong University of Rochester Toward Efficient and Protected Address Translation in Memory Management Memory management support on state-of-the-art architectures and operating systems (OS) encounters both performance and protection challenges for today's applications and execution environments. From a performance perspective, a variety of services, ranging from compilers to web user-interface frameworks, which provide the infrastructure for many high-level applications, suffer from performance degradation due to instruction address translation overheads. From a protection perspective, attackers can leverage address translation information to steal confidential data via privileged side-channel attacks. In this dissertation, (1) we explore the efficacy of different OS-level approaches to automatically reduce instruction address translation overhead for widely-used mobile, desktop, and server applications, including automatic superpage promotion and sharing page table and translation lookaside buffer (TLB) entries; and (2) we propose defenses against page table and last-level cache (LLC) side-channel attacks by privileged code and explore mitigations against bounds check bypass attacks launched by a compromised OS. Advisor: Prof. Sandhya Dwarkadas (Computer Science) Committee members: Prof. John Criswell (Computer Science), Dr. Kai Shen (Google), and Prof. Alan Cox (Rice University)