linux-kernel - Re: [PATCH v4] x86/kexec: Carry forward IMA measurement log on kexec

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Date:   Mon, 30 May 2022 08:40:07 +0000
From:   Jonathan McDowell <noodles@...com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.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>
Subject: Re: [PATCH v4] x86/kexec: Carry forward IMA measurement log on kexec

Borislav,

I don't think there are any outstanding review comments for me to deal
with on this, so is it safe to assume it'll get picked up at some point
once the merge window calms down?

On Wed, May 18, 2022 at 10:43:32AM -0400, Mimi Zohar wrote:
> On Thu, 2022-05-12 at 16:25 +0000, Jonathan McDowell wrote:
> > On kexec file load 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>
> 
> Not from using "setup_data" perspective,
> 
> 	Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>  # IMA function
> definitions
> 
> thanks,
> 
> Mimi

Thanks,
J.