Description: x86/mm: a per-cpu entry area leak was identified through the init_cea_offsets function when prefetchnta and prefetcht2 instructions being used for the per-cpu entry area mapping to the user space
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2217523
Notes:
 bwh> From the description on RHBZ, this seems like the unfixable residual
 bwh> effect of Meltdown and not a new issue.  There's no claim that kernel
 bwh> memory outside of the entry area can be read.
Bugs:
upstream: ignored "Unfixable CPU issue"
6.1-upstream-stable: ignored "Unfixable CPU issue"
5.10-upstream-stable: ignored "Unfixable CPU issue"
4.19-upstream-stable: ignored "Unfixable CPU issue"
sid: ignored "Unfixable CPU issue"
6.1-bookworm-security: ignored "Unfixable CPU issue"
5.10-bullseye-security: ignored "Unfixable CPU issue"
4.19-buster-security: ignored "Unfixable CPU issue"