[refpolicy] modules_object_t vs. modules_dep_t labeling

[dac.override@gmail.com (Dominick Grift)]

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On Thu, Oct 01, 2015 at 11:58:25AM +0200, Miroslav Grepl wrote:
> We have more and more bugs with mislabeled /lib/modules/*/modules.dep*
> files. There is a default label for them - modules_dep_t but we get them
> labeled as modules_object_t. Yes, we can add filename transition rules
> and also find a reason why they get wrong labeling (in progress).
> 
> But is there a big advantage to have these two labels. At least I don't
> see it from the policy point of view (sesearch).
> 
> Thank you.
> 

I am in the process of implementing modules_dep handling in my policy. I
think (but i am not yet sure) that kmod needs to create these files (depmod is run from
/sbin/new_kernel_pkg from the kernel-core RPM %post, and depmod is a link to
kmod) I suspect this is what needs to maintain it.

So the only advantage i see so far is that we do not have to allow kmod
to maintain module_object files if we have a module_dep type and if we allow
kmod to maintain files with that type instead.

To me that sounds like a valid enough reason, provided that rpm_script_t
actually runs kmod with a domain transition.

02DFF788
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Dominick Grift
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