From: Jarkko Sakkinen <jarkko@kernel.org>
To: Mimi Zohar <zohar@linux.ibm.com>
Cc: David Howells <dhowells@redhat.com>,
linux-integrity <linux-integrity@vger.kernel.org>,
Eric Snowberg <eric.snowberg@oracle.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
dwmw2@infradead.org, herbert@gondor.apana.org.au,
davem@davemloft.net, jmorris@namei.org, serge@hallyn.com,
nayna@linux.ibm.com, erichte@linux.ibm.com, mpe@ellerman.id.au,
keyrings@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-crypto@vger.kernel.org,
linux-security-module@vger.kernel.org,
James.Bottomley@hansenpartnership.com
Subject: Re: [PATCH v4] certs: Add EFI_CERT_X509_GUID support for dbx entries
Date: Sat, 30 Jan 2021 01:27:21 +0200 [thread overview]
Message-ID: <YBSZ2bfYsUo2Y28i@kernel.org> (raw)
In-Reply-To: <61a0420790250807837b5a701bb52f3d63ff0c84.camel@linux.ibm.com>
On Wed, Jan 27, 2021 at 09:03:59AM -0500, Mimi Zohar wrote:
> [Cc'ing linux-integrity]
>
> On Wed, 2021-01-27 at 11:46 +0000, David Howells wrote:
> > Jarkko Sakkinen <jarkko@kernel.org> wrote:
> >
> > > > I suppose a user space tool could be created. But wouldn’t what is
> > > > currently done in the kernel in this area need to be removed?
> > >
> > > Right. I don't think this was a great idea in the first place to
> > > do to the kernel but since it exists, I guess the patch does make
> > > sense.
> >
> > This information needs to be loaded from the UEFI tables before the system
> > starts loading any kernel modules or running any programs (if we do
> > verification of such, which I think IMA can do).
>
> There needs to a clear distinction between the pre-boot and post-boot
> keys. UEFI has its own trust model, which should be limited to UEFI.
> The .platform keyring was upstreamed and limited to verifying the kexec
> kernel image. Any other usage of the .platform keyring keys is
> abusing its intended purpose.
>
> The cover letter says, "Anytime the .platform keyring is used, the
> keys in the .blacklist keyring are referenced, if a matching key is
> found, the key will be rejected." I don't have a problem with loading
> the UEFI X509 dbx entries as long as its usage is limited to verifying
> the kexec kernel image.
>
> Mimi
Thanks Mimi, this is a valid argument. I agree.
/Jarkko
next prev parent reply other threads:[~2021-01-29 23:28 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 0:49 [PATCH v4] certs: Add EFI_CERT_X509_GUID support for dbx entries Eric Snowberg
2020-09-16 18:09 ` Jarkko Sakkinen
2020-12-10 9:49 ` David Howells
2020-12-10 18:56 ` Eric Snowberg
2021-01-12 14:57 ` David Howells
2021-01-13 20:41 ` Jarkko Sakkinen
2021-01-14 0:11 ` Eric Snowberg
2021-01-15 9:15 ` Jarkko Sakkinen
2021-01-15 16:49 ` Eric Snowberg
2021-01-20 11:26 ` Jarkko Sakkinen
2021-01-20 22:13 ` Eric Snowberg
2021-01-21 0:36 ` Jarkko Sakkinen
2021-01-27 11:46 ` David Howells
2021-01-27 14:03 ` Mimi Zohar
2021-01-27 15:41 ` Eric Snowberg
2021-01-28 4:13 ` Nayna
2021-01-30 10:24 ` Jarkko Sakkinen
2021-01-29 23:27 ` Jarkko Sakkinen [this message]
2021-01-12 17:10 ` David Howells
2021-01-12 19:13 ` Eric Snowberg
2021-01-15 17:21 ` James Bottomley
2021-01-15 23:01 ` Eric Snowberg
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