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Message-ID: <YsJSIIsCnjoL+ObY@MiWiFi-R3L-srv>
Date: Mon, 4 Jul 2022 10:36:16 +0800
From: Baoquan He <bhe@...hat.com>
To: Jonathan McDowell <noodles@...com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>, Mimi Zohar <zohar@...ux.ibm.com>,
Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
"linux-security-module@...r.kernel.org"
<linux-security-module@...r.kernel.org>,
"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>
Subject: Re: [PATCH v7] x86/kexec: Carry forward IMA measurement log on kexec
On 06/30/22 at 08:36am, Jonathan McDowell wrote:
> 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.
>
> (Mimi, Baoquan, I haven't included your reviewed-bys because this has
> changed the section annotations to __init and Boris reasonably enough
> wants to make sure IMA folk are happy before taking this update.)
>
> Signed-off-by: Jonathan McDowell <noodles@...com>
> Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG
LGTM,
Reviewed-by: Baoquan He <bhe@...hat.com>
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