Re: [PATCH 12/31] x86/entry/32: Add PTI cr3 switch to non-NMI entry/exit points

[Joerg Roedel]

On Thu, Mar 01, 2018 at 10:38:21AM -0800, Linus Torvalds wrote:
> Note that debug traps can happen regardless of TF, Think kgdb etc.
> Arguably kgdb users get what they deserve, but still.. I think root
> can set kernel breakpoints too.

But that seems to be broken right now at least wrt. to the espfix code
where there is no handling for in the #DB handler. Can userspace really
set arbitrary kernel breakpoints?


	Joerg