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Re: [PATCH v3 2/5] livepatch: Embed public key in Xen
- To: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 5 Jun 2025 13:19:00 +0200
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- Cc: Kevin Lampis <kevin.lampis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 05 Jun 2025 11:19:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.06.2025 15:36, Ross Lagerwall wrote:
> From: Kevin Lampis <kevin.lampis@xxxxxxxxx>
>
> Make it possible to embed a public key in Xen to be used when verifying
> live patch payloads. Inclusion of the public key is optional.
>
> To avoid needing to include a DER / X.509 parser in the hypervisor, the
> public key is unpacked at build time and included in a form that is
> convenient for the hypervisor to consume. This is different approach
> from that used by Linux which embeds the entire X.509 certificate and
> builds in a parser for it.
>
> A suitable key can be created using openssl:
>
> openssl req -x509 -newkey rsa:2048 -keyout priv.pem -out pub.pem \
> -sha256 -days 3650 -nodes \
> -subj
> "/C=XX/ST=StateName/L=CityName/O=CompanyName/OU=CompanySectionName/CN=CommonNameOrHostname"
> openssl x509 -inform PEM -in pub.pem -outform PEM -pubkey -nocert -out
> verify_key.pem
>
> Signed-off-by: Kevin Lampis <kevin.lampis@xxxxxxxxx>
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
While reviewing patch 4 it occurred to me: Why embed the key? Can't this
be specified as (another) boot module?
Jan
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