Re: [PATCH v7 5/6] x86/signal: Detect and prevent an alternate signal stack overflow

I forgot to mention why I cc'd all you fine Xen folk:

On Thu, Mar 25, 2021 at 11:13 AM Andy Lutomirski [off-list ref] wrote:

quoted

        } else if (IS_ENABLED(CONFIG_X86_32) &&
                   !onsigstack &&
                   regs->ss != __USER_DS &&

This bit here seems really dubious on Xen PV.  Honestly it seems
dubious everywhere, but especially on Xen PV.

--Andy