Re: [PATCH v3 1/3] SROP Mitigation: Architecture independent code for signal cookies

From: Jonathan Corbet
Date: Wed Mar 09 2016 - 17:22:24 EST

On Wed, 9 Mar 2016 15:07:07 -0700
Scotty Bauer <sbauer@xxxxxxxxxxxx> wrote:

> On 03/09/2016 01:32 AM, Ingo Molnar wrote:
> >
> > Could you please add a high level description in Documentation
> > that explains the attack and the way how this mitigation code
> > prevents that kind of attack?
> >
> > Also, the first changelogs should contain more high level
> > description as well. For example, what does the 'verification'
> > of the signal cookie mean, and how does it prevent an SROP
> > attempt?
> >
> > All of these patches seem to assume that people reading this code
> > know what SROP is and how we defend against it - that is not so.
> I'm going to submit v4 to fix some nits where I'll include the explanation
> and a change log, I apologize for not doing that here. In the meantime if
> you don't mind visiting a link I included a brief explanation on previous
> versions of the patch set.

The curious might also find background information in my article about this
patch set:

(The information still belongs with the patch posting, of course...)