linux-kernel - Re: kexec_load(2) bypasses signature verification

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Message-ID: <20150615131728.GK15793@thunk.org>
Date:	Mon, 15 Jun 2015 09:17:28 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Eric Biederman <ebiederm@...ssion.com>,
	David Howells <dhowells@...hat.com>,
	kexec <kexec@...ts.infradead.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: kexec_load(2) bypasses signature verification

On Mon, Jun 15, 2015 at 08:14:19AM -0400, Josh Boyer wrote:
> Yes, which is why most of the distro vendors carry an out-of-tree
> patch that disables the old kexec in an SB setup.  It would be nice if
> we could merge said patches.  However, they depend on Matthew's
> secure_modules/trusted_kernel/<whatever name that works> patchset
> which has gotten little movement since we came up with a tentative
> agreement at LPC 2013.

Signed modules is in, though, right?  And the fact that we have
CONFIG_SIGNED_PE_FILE_VERIFICATION means we're doing unatural file
signatures w/o using ELF, which I thought was the basis of Linus's
accusation that Red Hat was performing intimate/physical acts with
Microsoft.  :-)

I would have thought those were the nasty bits to get in; out of
curiosity, what's still missing?

Regards,

						- Ted
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