netdev - Re: [Bugme-new] [Bug 10748] New: dhclient fails to run; capabilities error

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Date:	Tue, 20 May 2008 11:06:35 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Amit Shah <shahamit@...il.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	Andrew Morgan <morgan@...nel.org>,
	lsm <linux-security-module@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [Bugme-new] [Bug 10748] New: dhclient fails to run;
	capabilities error


On Tue, 2008-05-20 at 10:45 -0400, Stephen Smalley wrote:
> On Tue, 2008-05-20 at 19:37 +0530, Amit Shah wrote:
> > On Tue, May 20, 2008 at 7:28 PM, Stephen Smalley <sds@...ho.nsa.gov> wrote:
> > >
> > > On Tue, 2008-05-20 at 09:38 -0400, Stephen Smalley wrote:
> > >> Which means that he is using the dummy security module.
> > >> And it appears that a prior commit moved KEEPCAPS handling from
> > >> core prctl() to cap_task_prctl(), but didn't replicate it in
> > >> the dummy_task_prctl().
> > >>
> > >> The dummy module really needs to die.
> > >
> > > Question for the bug reporter:  did you really mean to build a kernel
> > > without capabilities support?  Surprise!  They don't really work when
> > > disabled.
> > 
> > No; I was just trying out some random configs. This config worked till
> > .25 properly though.
> 
> The dummy module is generally in the untenable position of having to lie
> to userspace or break the existing capability-related system call
> interface.  It should just go away, and make capability the default
> module (w/ stubs for the rest of the LSM hooks as with dummy).  Then
> CONFIG_SECURITY=n will yield the same result as CONFIG_SECURITY=y w/o
> any further options.

(cc Chris Wright and linux-security-module list)

s/same result/same user-visible behavior/ 

-- 
Stephen Smalley
National Security Agency

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