Tracking down secret leakage through SIMD registers

&#xA;&#xA;&#xA; During my work on the ashen project's linux kernel components, I've found secrets leaking into RAM dumps taken long after they should have been deleted by userspace. It turned out that SIMD-accelerated memcpy on x86-64 and ARM64 leaves residual data in SIMD registers, which will then eventually find their way into kernel memory during context switching. &#xA;