linux-kernel - Re: [PATCH v6 0/3] security: Yama LSM

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Message-ID: <CAGXu5jJuzjo0bLGcxDgyp6Uj=uJj02BL5Jr+e1WeqUwc18Oe-A@mail.gmail.com>
Date:	Fri, 18 Nov 2011 14:44:38 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Roland McGrath <roland@...k.frob.com>
Cc:	oleg@...hat.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH v6 0/3] security: Yama LSM

On Fri, Nov 18, 2011 at 1:45 PM, Roland McGrath <roland@...k.frob.com> wrote:
>> Do you have any objection to my LSM performing ptrace restrictions?
>> It's entirely self-contained, and all the major upstream crash
>> handlers are already using the prctl() interface it uses to declare
>> ptrace attach relationships.
>
> I don't have the context of what your LSM does.  But other LSMs apply their
> own rules in security_ptrace().  That's what the hook is for.  I'm not sure
> why we would object from the perspective of core ptrace functionality.
> LSMs are LSMs.  Their behavior is between you and your users, as far as I
> am concerned.  As experts on ptrace and aficionados of its users, we may
> have thoughts on what constraints on ptrace users would find annoying.
> But that doesn't mean we'd object per se to whatever bizarre constraints
> users want to ask an LSM to put on them.

Yup, that's precisely what Yama does as well. Sounds like you're not
naking an LSM that uses security_ptrace(), then.

Thanks!

-Kees

-- 
Kees Cook
ChromeOS Security
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