On 2018-10-31 14:35, Dave Hansen wrote:
On 10/31/18 2:30 PM, Sean Christopherson wrote:AFAIK there isn't a way to prevent userspace from manually invoking EENTER, short of doing some really nasty text poking or PTE swizzling. We could declare using EENTER as unsupported,Yep, userspace can call it all it wants, and we can also say that calling it outside the vdso is "undefined".
Is there a precedent for this? Are there any other ring 3 x86 instructions that Linux is claiming to be "undefined" when executed by a user process?
-- Jethro Beekman | Fortanix
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
