Description: Spectre-v1 Usercopy Hardening
References:
 https://github.com/google/security-research/security/advisories/GHSA-m7j5-797w-vmrh
 https://kernel.dance/#74e19ef0ff8061ef55957c3abd71614ef0f42f47
Notes:
Bugs:
upstream: released (6.3-rc1) [74e19ef0ff8061ef55957c3abd71614ef0f42f47]
6.1-upstream-stable: released (6.1.14) [684db631a15779c8f3b2235d507efdfe6bb10278]
5.10-upstream-stable: released (5.10.170) [3b6ce54cfa2c04f0636fd0c985913af8703b408d]
4.19-upstream-stable: released (4.19.274) [f8e54da1c729cc23d9a7b7bd42379323e7fb7979]
sid: released (6.1.15-1)
5.10-bullseye-security: released (5.10.178-1)
4.19-buster-security: released (4.19.282-1)