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• W4245413621 abstract "Once compromising the hypervisor, remote or local adversaries can easily access other customers' sensitive data in the memory and context of guest virtual machines (VMs). VM isolation is an efficient mechanism for protecting the memory of guest VMs from unauthorized access. However, previous VM isolation systems either modify hardware architecture or introduce a software module without being protected, and most of them focus on the x86 architecture. This paper proposes HA-VMSI, a lightweight hardware-assisted VM isolation approach for ARM, to provide runtime protection of guest VMs, even with a compromised hypervisor. In the ARM TrustZone secure world, a thin security monitor is introduced as HA-VMSI's entire TCB. Hence, the security monitor is much less vulnerable and safe from attacks that can compromise the hypervisor. The key of HA-VMSI is decoupling the functions of memory isolation among VMs from the hypervisor into the security monitor. As a result, the hypervisor can only update the Stage-2 page tables of VMs via the security monitor, which inspects and approves each new mapping. It is worth noting that HA-VMSI is more secure and effective than current software approaches, and more flexible and compatible than hardware approaches. We have implemented a prototype for KVM hypervisor with multiple Linux as guest OSes on Juno board. The security assessment and performance evaluation show that HA-VMSI is effective, efficient and practical." @default.
• W4245413621 created "2022-05-12" @default.
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• W4245413621 date "2017-04-08" @default.
• W4245413621 modified "2023-09-29" @default.
• W4245413621 title "HA-VMSI" @default.
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• W4245413621 doi "https://doi.org/10.1145/3140607.3050767" @default.
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