two questions

Eric Paris eparis at redhat.com
Sat Jan 5 15:22:39 UTC 2008


On Sat, 2008-01-05 at 14:58 +0100, Christoph Höger wrote:
> Am Freitag, den 04.01.2008, 18:34 -0500 schrieb Eric Paris:
> > On Fri, 2008-01-04 at 14:26 -0800, Clarkson, Mike R (US SSA) wrote:
> > > Is there someplace I can go to find a description of the libselinux API?
> > 
> > not sure, i just read the code   :)   the fedora libselinux-devel
> > package provides man pages for most (maybe all?) of the interfaces.
> > 
> > > 
> > > Is there a way to change the context of an existing process, without
> > > having to execute a new process?
> > 
> > yes, the permission is dyntransition in the process class.  it is
> > STRONGLY, let me say that again VERY STRONGLY, suggested that you don't
> > make use of this facility.  Basically you lose all seperation between
> > those 2 domains.  You don't have any assurance that the process before
> > the transition didn't get hacked/corrupted/bugged and is now
> > transitioning to a new domain but able to do the wrong things (or
> > sometimes even worse not transition to the new domain at all)
> 
> Hi, I don't think that it is that bad. Basically I think if you can
> transition from dom_a to dom_b that still does not include transition
> back to dom_a. So you can e.g. secure a new thread which handles a
> client or something without using execve.

dyntrans only works on single threaded processes.

-Eric
> 
> > 
> > I'm not sure what the rationale was to put it in originally but please
> > just find a way to do it on an execve boundary.
> > 
> > -Eric 
> > 
> > --
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> > fedora-selinux-list at redhat.com
> > https://www.redhat.com/mailman/listinfo/fedora-selinux-list
> 




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