Re: [PATCH] ptrace: allow restriction of ptrace scope

[Kees Cook <kees.cook@canonical.com>]

On Thu, Jun 17, 2010 at 11:18:59PM +0100, Alan Cox wrote:
> > And for them, it certainly seems like a good idea to be able to turn off
> > PTRACE without having to fiddle with an LSM.
> 
> But that *is* an LSM, its a security policy.
> 
> You don't seem to get it - even the default kernel security is a
> security policy (security/commoncap.c etc)

I do get it.  I also get that every LSM calls out to commoncap, making
it effectively stacked with the primary LSM -- the only LSM that gets
stacked.  In fact, this is how I even started implementing these features:
as patches to commoncap, but James preferred it to be in core since they
are of general utility.  But core people want the changes in security/
instead.

I don't mind putting them in commoncap at all.  I would just like people
to agree on what they disagree about.  :)

-Kees

-- 
Kees Cook
Ubuntu Security Team