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The Linux kernel configuration item CONFIG_MITIGATION_RFDS
:
CONFIG_CPU_SUP_INTEL
Enable mitigation for Register File Data Sampling (RFDS) by default. RFDS is a hardware vulnerability which affects Intel Atom CPUs. It allows unprivileged speculative access to stale data previously stored in floating point, vector and integer registers. See also Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
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