From: guido@trentalancia.com (Guido Trentalancia)
Date: Tue, 07 Jun 2011 21:11:24 +0200
Subject: [refpolicy] Help with policy definition.
In-Reply-To: <4DEE13A6.2070704@tresys.com>
References: <BANLkTi=2=mMMTE9raGH+HM8sa7SK3VX=fA@mail.gmail.com>
	<4DEE13A6.2070704@tresys.com>
Message-ID: <1307473886.14021.2.camel@vortex>
To: refpolicy@oss.tresys.com
List-Id: refpolicy.oss.tresys.com

On Tue, 2011-06-07 at 08:03 -0400, Christopher J. PeBenito wrote:
> On 06/06/11 19:26, Sam Gandhi wrote:
> > I am writing a policy for embedded device that I am working with. When
> > I am in permissive mode I can login to my console located on
> > /dev/ttymxc1.
> > 
> > which generate AVC message
> > 
> > user.notice kernel: type=1400 audit(165.890:8): avc:  denied  {
> > relabelto } for  pid=605 comm="login" name="ttymxc1" dev=tmpfs
> > ino=1475 scontext=system_u:system_r:kernel_t
> > tcontext=user_u:object_r:tty_device_t tclass=chr_file
> 
> Looks like your login program is running in the wrong context.  It
> should be local_login_t, not kernel_t.  Check the label on your init
> program (eg /sbin/init) which should be init_exec_t.

Shouldn't kernel_t be less restrictive than local_login_t (let alone the
fact that as you noted, it's wrong) ?

> > which audit2allow says should translate to :
> > 
> >      allow kernel_t tty_device_t:chr_file relabelto;
> > 
> > Even if with above allow rule when in enforcing mode I am not able to
> > login to my serial console and I get message on the console.
> > 
> > login: chsid(/dev/ttymxc1, user_u:object_r:tty_device_t) failed:
> > 
> > /dev/ttymxc1 in my case has label of  user_u:object_r:tty_device_t
> > 
> > What am I missing in my configuration or any hints on how I should go
> > about debugging this issue/
> 
>