linux-kernel - Re: [PATCH v2 7/7] ima: Support platform keyring for kernel appraisal

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Message-ID: <alpine.LRH.2.21.1812120553170.11653@namei.org>
Date:   Wed, 12 Dec 2018 05:53:30 +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 7/7] ima: Support platform keyring for kernel
 appraisal

On Sun, 9 Dec 2018, Nayna Jain wrote:

> On secure boot enabled systems, the bootloader verifies the kernel
> image and possibly the initramfs signatures based on a set of keys. A
> soft reboot(kexec) of the system, with the same kernel image and
> initramfs, requires access to the original keys to verify the
> signatures.
> 
> This patch allows IMA-appraisal access to those original keys, now
> loaded on the platform keyring, needed for verifying the kernel image
> and initramfs signatures.
> 
> Signed-off-by: Nayna Jain <nayna@...ux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
> Acked-by: Serge Hallyn <serge@...lyn.com>
> - replace 'rc' with 'xattr_len' when calling integrity_digsig_verify()
> with INTEGRITY_KEYRING_IMA for readability
> Suggested-by: Serge Hallyn <serge@...lyn.com>


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

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