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Cross-Core Interrupt Detection: Exploiting User and Virtualized IPIs
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Abstract
Interrupts are fundamental for inter-process and cross-core communication in modern systems. Controlling these communication mechanisms historically requires switches into the kernel or hypervisor, incurring high-performance costs. To alleviate these costs, Intel introduced new hardware mechanisms to send inter-processor interrupts (IPIs) from user space without switching into the kernel and from virtual machines without switching into the hypervisor. However, it is unclear whether this direct, unsupervised interaction between unprivileged (or virtualized) workloads and the underlying hardware introduces a significant change in the attack surface.
@misc{rauscher2024crosscore,
title = {Cross-Core Interrupt Detection: Exploiting User and Virtualized IPIs},
author = {Fabian Rauscher and Daniel Gruss},
year = {2024},
journal = {ACM SIGSAC Conference on Computer and Communications Security (CCS)},
pages = {94--108},
doi = {10.1145/3658644.3690242},
}