[RFC PATCH] uprobes: copy to user-space xol page with proper cache flushing

[Oleg Nesterov]

On 04/15, David Miller wrote:
>
> From: Oleg Nesterov <oleg at redhat.com>
> Date: Tue, 15 Apr 2014 19:49:00 +0200
>
> > We do not want to write to, say, page cache if the probed application
> > mmaps a file at the same vaddr.
>
> If user has write access to that page... not our problem.

Well, I am not sure.

Yes, this won't allow you to write the exploit. But if this actually
happens because an application is buggy, this can lead to really
hard-to-debug problems.

Oleg.