On Thu, 2 May 2019 11:02:40 -0700 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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
