linux-kernel - Re: [PATCH v6 3/6] x86/kexec: Carry forward IMA measurement log on kexec

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Message-ID: <MWHPR15MB11506A98B95F5834365FC510EB8E9@MWHPR15MB1150.namprd15.prod.outlook.com>
Date:   Wed, 20 Jul 2022 13:44:50 +0000
From:   Nageswara R Sastry <nasastry@...ibm.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
CC:     "nayna@...ux.ibm.com" <nayna@...ux.ibm.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        Jonathan McDowell <noodles@...com>,
        Borislav Petkov <bp@...e.de>, Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [PATCH v6 3/6] x86/kexec: Carry forward IMA measurement log on
 kexec



________________________________________
> From: Stefan Berger <stefanb@...ux.ibm.com>
> Sent: 07 July 2022 10:50 PM
> To: kexec@...ts.infradead.org; devicetree@...r.kernel.org; linux-integrity@...r.kernel.org; linux-kernel@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org
> Cc: nayna@...ux.ibm.com; Nageswara R Sastry; mpe@...erman.id.au; Jonathan McDowell; Borislav Petkov; Mimi Zohar
> Subject: [PATCH v6 3/6] x86/kexec: Carry forward IMA measurement log on kexec

> From: Jonathan McDowell <noodles@...com>

> On kexec file load, the Integrity Measurement Architecture (IMA)
> subsystem may verify the IMA signature of the kernel and initramfs, and
> measure it. The command line parameters passed to the kernel in the
> kexec call may also be measured by IMA.

> A remote attestation service can verify a TPM quote based on the TPM
> event log, the IMA measurement list and the TPM PCR data. This can
> be achieved only if the IMA measurement log is carried over from the
> current kernel to the next kernel across the kexec call.

> PowerPC and ARM64 both achieve this using device tree with a
> "linux,ima-kexec-buffer" node. x86 platforms generally don't make use of
> device tree, so use the setup_data mechanism to pass the IMA buffer to
> the new kernel.

> Signed-off-by: Jonathan McDowell <noodles@...com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com> # IMA function definitions
> Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG
> ---
 
Tested-by: Nageswara R Sastry <rnsastry@...ux.ibm.com>