Re: [PATCH RFC 3/4] x86/pti: don't mark the user PGD with _PAGE_NX.

[Dave Hansen]

On 01/08/2018 09:17 AM, Willy Tarreau wrote:
>> I think the prctl() should apply to an entire process, not to a thread.
> 
> As I mentionned in another mail, I didn't know how to do it, even less
> how to do it fast enough so that we didn't add more cycles to the syscall
> code.

You can _implement_ it with a task thread if you want.  Just spray it
across all threads at the prctl()-time instead of a single thread.
It'll take a wee bit of locking.

I just don't think the API should apply to a single thread.