Re: Stacking Openwall and SELinux?

From: Stephen Smalley (sdsat_private)
Date: Tue Apr 02 2002 - 05:35:08 PST

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    On Tue, 2 Apr 2002, Russell Coker wrote:
    
    > It doesn't seem to work at all.  But I guess this is the SE Linux and OWLSM
    > stacking issue.
    
    At present, the SELinux security module only calls the secondary security
    module for the small set of hooks that are implemented by either the dummy
    or capabilities security modules.  Furthermore, the stacking for some of
    the dummy/capability hooks is transparently handled merely by stacking
    the capable hook, since some of the hook functions are implemented
    entirely in terms of capable() calls.  It would be straightforward to
    change the SELinux module to always invoke the secondary security module
    for every hook (at some cost in overhead), and this would provide greater
    generality, but you still need to understand how the modules might
    interact and you need to ensure that they do not conflict in terms of
    their useage of the security fields.  If we were to change the SELinux
    module in this way, you could then probably stack SELinux+OWLSM as long as
    you disabled the OWLSM options that use the security field, but you would
    still need to address the hardwired superuser logic in OWLSM and the
    current inability to stack multiple secondary modules in order to stack
    SELinux+capabilities+OWLSM.
    
    --
    Stephen D. Smalley, NAI Labs
    ssmalleyat_private
    
    
    
    
    
    
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