Arm Stack Sealing vulnerability #9
Description
Issue
Arm has disclosed a potential Armv8-M processor Secure software Stack Sealing vulnerability on 16th October 2020. More Info here.
According to ARM, the mitigation for this vulnerability is purely in software and is referred as stack sealing. It is only necessary in Armv8-M processors where the TrustZone security extension is being used, i.e. there is code running in both Secure and Non-secure states. No changes to hardware are required.
This will be fixed in the next FSP release.