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

[Linus Torvalds]

On Fri, Dec 18, 2015 at 2:28 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>
> Apps that don't want to use the baseline_pkru mechanism could use
> syscalls to claim ownership of protection keys but then manage them
> purely with WRPKRU directly.  We could optionally disallow
> mprotect_key on keys that weren't allocated in advance.
>
> Does that seem sane?

So everything seems sane except for the need for that baseline_pkru.

I'm not seeing why it couldn't just be a fixed value. Is there any
real downside to it?

                    Linus
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