Re: Security issues with local filesystem caching

[Jeff V. Merkey]

David Howells wrote:

> Jeff V. Merkey <jmerkey@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
>  
>
> > SELinux support addresses all of these issues for B1 level security quite
> > well with mandatory access controls at the fs layers.  In fact, it works so
> > well, when enabled you cannot even run apache on top of an FS unless
> > configured properly.
> >    
>
> How?  The problem I've got is that the caching code would be creating and
> accessing files and directories with the wrong security context - that of the
> calling process - and not a context suitable for sharing things in the cache
> whilst protecting them from userspace as best we can.
>  
Have it access them as 0.0 (root) when you change the fsuid, etc. and I 
think this would satisfy security concerns.  I agree that it sounds like
someone needs to instrument MAC layers with this subsystem.

Jeff

> David
>
>  

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