On Thu, Apr 25, 2019 at 2:56 PM James Bottomley <
James.Bottomley@hansenpartnership.com> wrote:

> On Thu, 2019-04-25 at 13:47 -0700, Jonathan Adams wrote:
> > It looks like the MM track isn't full, and I think this topic is an
> > important thing to discuss.
>
> Mike just posted the RFC patches for this using a ROP gadget preventor
> as a demo:
>
>
> https://lore.kernel.org/linux-mm/1556228754-12996-1-git-send-email-rppt@linux.ibm.com
>
> but, unfortunately, he won't be at LSF/MM.
>
> James
>

Mike's proposal is quite different, and targeted at restricting ROP
execution.
The work proposed by Jonathan is aimed to transparently restrict
speculative execution to provide generic mitigation against Spectre-V1
gadgets (and similar) and potentially eliminate the current need for for
page table switches under most syscalls due to Meltdown.