linux-kernel - Re: [PATCH v2 1/7] integrity: Define a trusted platform keyring

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Message-ID: <alpine.LRH.2.21.1812120527150.11653@namei.org>
Date:   Wed, 12 Dec 2018 05:27:44 +1100 (AEDT)
From:   James Morris <jmorris@...ei.org>
To:     Nayna Jain <nayna@...ux.ibm.com>
cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, zohar@...ux.ibm.com,
        dhowells@...hat.com, jforbes@...hat.com,
        seth.forshee@...onical.com, kexec@...ts.infradead.org,
        keyrings@...r.kernel.org, vgoyal@...hat.com, ebiederm@...ssion.com,
        mpe@...erman.id.au
Subject: Re: [PATCH v2 1/7] integrity: Define a trusted platform keyring

On Sun, 9 Dec 2018, Nayna Jain wrote:

> On secure boot enabled systems, a verified kernel may need to kexec
> additional kernels. For example, it may be used as a bootloader needing
> to kexec a target kernel or it may need to kexec a crashdump kernel. In
> such cases, it may want to verify the signature of the next kernel
> image.
> 
> It is further possible that the kernel image is signed with third party
> keys which are stored as platform or firmware keys in the 'db' variable.
> The kernel, however, can not directly verify these platform keys, and an
> administrator may therefore not want to trust them for arbitrary usage.
> In order to differentiate platform keys from other keys and provide the
> necessary separation of trust, the kernel needs an additional keyring to
> store platform keys.
> 
> This patch creates the new keyring called ".platform" to isolate keys
> provided by platform from keys by kernel. These keys are used to
> facilitate signature verification during kexec. Since the scope of this
> keyring is only the platform/firmware keys, it cannot be updated from
> userspace.
> 
> This keyring can be enabled by setting CONFIG_INTEGRITY_PLATFORM_KEYRING.
> 
> Signed-off-by: Nayna Jain <nayna@...ux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
> Acked-by: Serge Hallyn <serge@...lyn.com>


Reviewed-by: James Morris <james.morris@...rosoft.com>


-- 
James Morris
<jmorris@...ei.org>