Bug 697617

This is a kernel regression but we dontaudit it in 

selinux-policy-3.9.7-39.fc14

(In reply to comment #0)
> [...] (I have
> absolutely no idea what kernel modules wpa_supplicant might possibly be trying
> to load...):

0) Neither have I, but the (verbose) "SETroubleshoot Detail Window", which you apperently copied, doesn't tell us which module wpa_supplicant loaded. Separate bug?

1) Anyhow, identical to bug #697221.

*** Bug 697221 has been marked as a duplicate of this bug. ***

There is a kernel bug on this, and yes it would be nice if the kernel would tell us which module was attempted to be loaded.

(In reply to comment #4)
> There is a kernel bug on this,

0) That seems to be bug #684415 (and this one may be closed as a duplicate too, I guess).

> and yes it would be nice if the kernel would
> tell us which module was attempted to be loaded.

1) Well, a comment in bug #684415 (https://bugzilla.redhat.com/show_bug.cgi?id=684415#c15) links to the upstream commit that apparently started all this: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=8909c9ad8ff03611c9c96c9a92656213e4bb495b .

A snippet from that commit suggests that this shouldn't fail silently if we have CAP_SYS_MODULE. But maybe that commit is not at issue here or maybe SELinux somehow hides that pr_err() because capable(CAP_SYS_MODULE) fails, or something entirely different is going on. Anyway, it should be trivial to make the code more verbose. I'm referring to this:

 void dev_load(struct net *net, const char *name)
 {
        struct net_device *dev;
+       int no_module;
 
        rcu_read_lock();
        dev = dev_get_by_name_rcu(net, name);
        rcu_read_unlock();
 
-       if (!dev && capable(CAP_NET_ADMIN))
-               request_module("%s", name);
+       no_module = !dev;
+       if (no_module && capable(CAP_NET_ADMIN))
+               no_module = request_module("netdev-%s", name);
+       if (no_module && capable(CAP_SYS_MODULE)) {
+               if (!request_module("%s", name))
+                       pr_err("Loading kernel module for a network device "
+"with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev-%s "
+"instead\n", name);
+       }
 }

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