[refpolicy] [PATCH]: dontaudit sys_module wpa_supplicant

[Daniel J Walsh]

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On 03/20/2011 06:41 PM, Guido Trentalancia wrote:
> On Mon, 2011-03-21 at 08:55 +1100, Russell Coker wrote:
>> On Mon, 21 Mar 2011, Guido Trentalancia <guido at trentalancia.com> wrote:
>>>> Sounds like we want to allow the wpa_suplicant to do this.
>>>
>>> Not everybody likes that to happen. And surely there must be a good
>>> reason for having a "neverallow" rule in kernel/kernel.te which blocks
>>> everything.
>>>
>>> See Bug#515136 on Debian but even more importantly Bug#684415 on Fedora.
>>
>> That Debian bug isn't relevant.
> 
> It's old, I think or it lacks details. But it was just to show that it
> is (or it was) happening on Debian. I think I told you already that the
> Fedora bug is more relevant.
> 
>> Dan asked "Why would wpa_supplicant be loading kernel modules directly?".  You 
>> have answered that question in this discussion, you could include your answer 
>> in the Red Hat Bugzilla if you want.
>>
>> On Mon, 21 Mar 2011, Guido Trentalancia <guido at trentalancia.com> wrote:
>>> So unless Dan Walsh changes his mind there needs to be at least one
>>> ifdef (for DISTRO=redhat).
>>
>> If Dan has expressed an opinion on this matter then please cite a reference.  
>> Asking why something happens is a long way from stating an opinion that it 
>> shouldn't be permitted.
> 
> The reference was the Fedora bug.
> 
> I think it's rather obvious that wpa_supplicant might need to load
> modules for crypto or wireless cards. So in my opinion Dan's question
> should not be interpreted literally. But all of this is pointless now as
> eventually people will get back on this tomorrow.
> 
>>> I am happy to prepare a patch which does can_load_kernmodule()/dontaudit
>>> depending on the distribution, but I need to hear from people with
>>> authority for each distribution. And Christopher should decide what
>>> would be the default behaviour.
>>
>> You have already heard from me.
> 
> Yes, I agree with you that it is safe to use sys_module but I would like
> to hear from others. So the patch was intended to remind us of that
> issue mainly, as even if it was applied by mistake or without
> discussion, it won't change the current situation. The description of
> the patch makes it clear that normal functioning of wpa_supplicant might
> be affected and that is the important thing.
> 
>> Don't get too bothered about getting support from different distributions, no-
>> one else worries much about such things.
> 
> Well, on my system the relative modules are loaded before wpa_supplicant
> is started. There might be systems where wpa_supplicant would not be
> able to load modules and the network would not work. I don't think this
> is desirable.
> 
> Regards,
> 
> Guido
> 
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Eric is investigating right now whether this is a kernel bug.  If I
understand correctly the kernel is allowing wpa supplicant to load a
some kernel modules as long as they are named properly.  I had better
let Eric explain the rest.
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