2 May
2019
2 May
'19
8:48 p.m.
On Thu, 2 May 2019 11:02:40 -0700 Linus Torvalds torvalds@linux-foundation.org wrote:
Indeed, the 32-bit case for same-RPL exceptions/iret is entirely different, and I'd forgotten about that.
And honestly, this makes the 32-bit case much worse. Now the entry stack modifications of int3 suddenly affect not just the entry, but every exit too.
This is _exactly_ the kind of subtle kernel entry/exit code I wanted us to avoid.
I just want to point out that I never got the trampoline version working on i386. I didn't have the time to debug why it would crash when stressed.
-- Steve