Phd thesis on operating systems x86
Academic Commons
The constant rise in the number of software weaknesses, coupled with the sophistication of modern adversaries, make the need for effective and adaptive defenses more critical than ever. In this dissertation, we develop a set of novel protection mechanisms, and introduce new concepts and techniques to secure commodity operating systems against attacks that exploit vulnerabilities in kernel code.
Attacks that leverage the weak separation between user and kernel space, characterized as phd thesis on operating systems x86 ret2usr attacks, have been the de facto kernel exploitation technique in virtually every major OS, while they are not limited to the x86 platform, but have also targeted ARM and others.
Given the multi-OS phd thesis on operating systems x86 cross-architecture nature of phd thesis on operating systems x86 threats, we propose kGuard: CFAs, a new confinement inline monitoring concept that we phd thesis on operating systems x86, act as guards that prevent the unconstrained transition of privileged execution paths to user space.
To thwart attacks against itself, phd thesis on operating systems x86 also incorporates two novel code diversification techniques: Both countermeasures randomize the location of the inline guards, creating a jokowi write great speech target for an attacker that tries to pinpoint their exact placement to evade kGuard.
Furthermore, we expose a set of additional kernel design practices that trade stronger isolation for performance, all of which can read more harnessed phd thesis on operating systems x86 deconstruct kernel isolation. To demonstrate the significance phd thesis on operating systems x86 the problem, we introduce a new kernel exploitation technique, dubbed return-to-direct-mapped memory ret2dirwhich relies on inherent properties of the memory management sub system of modern OSes to bypass every ret2usr defense to date.
To illustrate the effectiveness of ret2dir, we outline a principled methodology for constructing reliable exploits against hardened targets.
We built XPFO on Linux phd thesis on operating systems x86 implemented a set of optimizations, related to TLB handling and page frame content sanitization, to minimize its performance penalty. More About This Work. Academic Commons is managed by this web page Columbia University Libraries.
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