19 Aug
2022
19 Aug
'22
8:47 a.m.
On Fri, Aug 19, 2022 at 02:33:08AM +0200, Ben Hutchings wrote:
From: Ben Hutchings benh@debian.org
The mitigation for PBRSB includes adding LFENCE instructions to the RSB filling sequence. However, RSB filling is done on some older CPUs that don't support the LFENCE instruction.
Wait; what? There are chips that enable the RSB mitigations and DONT have LFENCE ?!?