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We present a software approach to mitigate access-driven side-channel attacksthat leverage last-level caches (LLCs) shared across cores to leak informationbetween security domains (e.g., tenants in a cloud). Our approach dynamicallymanages physical memory pages shared between security domains to disablesharing of LLC lines, thus preventing "Flush-Reload" side channels via LLCs. Italso manages cacheability of memory pages to thwart cross-tenant "Prime-Probe"attacks in LLCs. We have implemented our approach as a memory managementsubsystem called CacheBar within the Linux kernel to intervene on such sidechannels across container boundaries, as containers are a common method forenforcing tenant isolation in Platform-as-a-Service (PaaS) clouds. Throughformal verification, principled analysis, and empirical evaluation, we showthat CacheBar achieves strong security with small performance overheads forPaaS workloads.

A software approach to defeating side channels in last-level caches