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Different from the traditional software vulnerability, the microarchitectureside channel has three characteristics: extensive influence, potent threat, andtough defense. The main reason for the micro-architecture side channel isresource sharing. There are many reasons for resource sharing, one of which isSMT (Simultaneous Multi-Threading) technology. In this paper, we define the SMTTransient Channel, which uses the transient state of shared resources betweenthreads to steal information. To mitigate it, we designed a securitydemand-based dynamic mitigation (DDM) to Mitigate the SMT transient channels.The DDM writes the processes' security requirements to the CPU register sets,and the operating system calls the HLT instruction to dynamically turn on andoff the hyper-threading according to the register values to avoid the sidechannels caused by execution resource sharing. During the implementation of thescheme, we modified the Linux kernel and used the MSR register groups of Intelprocessor. The evaluation results show that DDM can effectively protect againstthe transient side-channel attacks such as PortsMash that rely on SMT, and theperformance loss of DDM is less than 8%.

DDM: A Demand-based Dynamic Mitigation for SMT Transient Channels