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Date: Thu, 02 Nov 2017 17:41:21 -0400 From: Mimi Zohar <zohar@...ux.vnet.ibm.com> To: David Howells <dhowells@...hat.com> Cc: linux-security-module@...r.kernel.org, gnomes@...rguk.ukuu.org.uk, linux-efi@...r.kernel.org, matthew.garrett@...ula.com, gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, jforbes@...hat.com Subject: Re: [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 <zohar@...ux.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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