Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?

[Linus Torvalds]

On Fri, Dec 18, 2015 at 1:04 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> I do wonder if you need an explicit value, though. I think it's
> reasonable to say that PKRU value 0 is special. It's what we'd start
> processes with, and why not just say that it's what we run signal
> handlers in?
>
> Would any other value ever make sense, really?

Ahh. Your point about the PROT_EXEC handling means that maybe we don't
want to default to zero. Maybe we want to make the default PKRU
startup value be 1 instead, enabling access disable key for key 0?

         Linus
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