Re: [PATCH 03/10] x86/cet: Signal handling for shadow stack

[Cyrill Gorcunov]

On Thu, Jun 07, 2018 at 01:57:03PM -0700, Andy Lutomirski wrote:
...
> >
> > I didn't read the whole series of patches in details
> > yet, hopefully will be able tomorrow. Thanks Andy for
> > CC'ing!
> 
> We have uc_flags.  It might be useful to carve out some of the flag
> space (24 bits?) to indicate something like the *size* of sigcontext
> and teach the kernel that new sigcontext fields should only be parsed
> on sigreturn() if the size is large enough.

Yes, this should do the trick.