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

On Thu, 2017-11-02 at 21:30 +0000, David Howells wrote:

Mimi Zohar [off-list ref] wrote:

quoted

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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