Subject: FreeBSD's latest SA on amd fpu usage..
To: None <>
From: Martijn van Buul <>
List: port-amd64
Date: 04/19/2006 08:43:21

The latest FreeBSD security advisory is a nasty one, see

It basicly boils down to "In contrast to popular belief, fx(save|rstor) 
doesn't save/restore all registers". Apperently, FOP, FIP and FDP aren't
saved. While I'm starting to get a little bit weary about "This may allow an
attacker to steal cryptographic keys", I do see the possibility of opening
a covert channel this way.

Are we at risk? (And is the i386 port at risk..)