* Andy Lutomirski <l...@amacapital.net> wrote:
> > If we push a PKRU value into a thread between the rdpkru() and wrpkru(),
> > we'll
> > lose the content of that "push". I'm not sure there's any way to guarantee
> > this with a user-controlled register.
>
> We could try to insist that user code uses some vsyscall helper that tracks
> which bits are as-yet-unassigned. That's quite messy, though.
Actually, if we turned the vDSO into something more like a minimal user-space
library with the ability to run at process startup as well to prepare stuff
then
it's painful to get right only *once*, and there will be tons of other areas
where
a proper per thread data storage on the user-space side would be immensely
useful!
Thanks,
Ingo
