linux-kernel - Re: [PATCH v12 00/11] Appended signatures support for IMA appraisal

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Message-Id: <1566999821.6115.14.camel@linux.ibm.com>
Date:   Wed, 28 Aug 2019 09:43:41 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Jordan Hand <jorhand@...ux.microsoft.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        linux-integrity@...r.kernel.org
Cc:     linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Jessica Yu <jeyu@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        "AKASHI, Takahiro" <takahiro.akashi@...aro.org>
Subject: Re: [PATCH v12 00/11] Appended signatures support for IMA appraisal

Hi Jordan,

On Mon, 2019-08-26 at 15:46 -0700, Jordan Hand wrote:
> On 6/27/19 7:19 PM, Thiago Jung Bauermann wrote:
> > On the OpenPOWER platform, secure boot and trusted boot are being
> > implemented using IMA for taking measurements and verifying signatures.
> > Since the kernel image on Power servers is an ELF binary, kernels are
> > signed using the scripts/sign-file tool and thus use the same signature
> > format as signed kernel modules.
> > 
> > This patch series adds support in IMA for verifying those signatures.
> > It adds flexibility to OpenPOWER secure boot, because it allows it to boot
> > kernels with the signature appended to them as well as kernels where the
> > signature is stored in the IMA extended attribute.
> 
> I know this is pretty late, but I just wanted to let you know that I
> tested this patch set on x86_64 with QEMU.
> 
> That is, I enrolled a key to _ima keyring, signed my kernel and modules
> with appended signatures (with scripts/sign-file), set the IMA policy to
> appraise and measure my kernel and modules. Also tested kexec appraisal.
> 
> You can add my tested-by if you'd like.

I really appreciate your testing.  Based on the recent
Documentation/maintainer/rebasing-and-merging.rst,  I'm trying not to
rebase patches already staged in linux-next.  Patches are first being
staged in the next-queued-testing branch.

FYI, I just posted a patch that adds IMA appended signature support to
test_kexec_file_load.sh.

thanks,

Mimi