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SubjectRe: [tip:x86/pti] x86/retpoline: Fill RSB on context switch for affected CPUs
From
Date
> 
> This would means that userspace would see return predictions based
> on the values the kernel 'stuffed' into the RSB to fill it.
>
> Potentially this leaks a kernel address to userspace.

KASLR pretty much died in May this year to be honest with the KAISER paper (if not before then)

also with KPTI the address won't have a TLB mapping so it wouldn't
actually be speculated into.

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