[PATCH 03/27] Enforce module signatures if the kernel is locked down

[Mimi Zohar]

On Thu, 2017-11-02 at 21:30 +0000, David Howells wrote:
> Mimi Zohar <zohar at linux.vnet.ibm.com> wrote:
> 
> > By this point, IMA-appraisal has already verified the kernel module
> > signature back in kernel_read_file_from_fd(), if it was required.
> >  Having a key with which to verify the appended signature or requiring
> > an appended signature, should not be required as well.
> 
> I guess I don't need to put in any support for IMA here, then, and you've
> taken care of it in your patchset such that it won't actually go into
> module_sig_check() in that case (or will at least return immediately).

Right, it would never get here if the IMA signature verification
fails.  If sig_enforce is not enabled, then it will also work.  So the
only case is if sig_enforced is enabled and there is no key.

eg.
         else if (can_do_ima_check && is_ima_appraise_enabled())
                err = 0;

Mimi 

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