linux-kernel - Re: [PATCH v6 12/14] x86: Secure Launch late initcall platform module

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Message-Id: <CSIYK2ZJ6YRH.29WEQTLNYMDUF@suppilovahvero>
Date:   Thu, 11 May 2023 01:40:53 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Ross Philipson" <ross.philipson@...cle.com>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        <linux-integrity@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <kexec@...ts.infradead.org>, <linux-efi@...r.kernel.org>
Cc:     <dpsmith@...rtussolutions.com>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <bp@...en8.de>, <hpa@...or.com>,
        <ardb@...nel.org>, <mjg59@...f.ucam.org>,
        <James.Bottomley@...senpartnership.com>, <luto@...capital.net>,
        <nivedita@...m.mit.edu>, <kanth.ghatraju@...cle.com>,
        <trenchboot-devel@...glegroups.com>
Subject: Re: [PATCH v6 12/14] x86: Secure Launch late initcall platform
 module

On Thu May 4, 2023 at 5:50 PM EEST, Ross Philipson wrote:
> From: "Daniel P. Smith" <dpsmith@...rtussolutions.com>
>
> The Secure Launch platform module is a late init module. During the
> init call, the TPM event log is read and measurements taken in the
> early boot stub code are located. These measurements are extended
> into the TPM PCRs using the mainline TPM kernel driver.
>
> The platform module also registers the securityfs nodes to allow
> access to TXT register fields on Intel along with the fetching of
> and writing events to the late launch TPM log.
>
> Signed-off-by: Daniel P. Smith <dpsmith@...rtussolutions.com>
> Signed-off-by: garnetgrimm <grimmg@...fosec.com>
> Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
> ---
>  arch/x86/kernel/Makefile   |   1 +
>  arch/x86/kernel/slmodule.c | 520 +++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 521 insertions(+)
>  create mode 100644 arch/x86/kernel/slmodule.c
>
> diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> index 3d2a33e..ee3fe300 100644
> --- a/arch/x86/kernel/Makefile
> +++ b/arch/x86/kernel/Makefile
> @@ -73,6 +73,7 @@ obj-$(CONFIG_IA32_EMULATION)	+= tls.o
>  obj-y				+= step.o
>  obj-$(CONFIG_INTEL_TXT)		+= tboot.o
>  obj-$(CONFIG_SECURE_LAUNCH)	+= slaunch.o
> +obj-$(CONFIG_SECURE_LAUNCH)	+= slmodule.o
>  obj-$(CONFIG_ISA_DMA_API)	+= i8237.o
>  obj-y				+= stacktrace.o
>  obj-y				+= cpu/
> diff --git a/arch/x86/kernel/slmodule.c b/arch/x86/kernel/slmodule.c
> new file mode 100644
> index 0000000..70dcff5
> --- /dev/null
> +++ b/arch/x86/kernel/slmodule.c
> @@ -0,0 +1,520 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Secure Launch late validation/setup, securityfs exposure and
> + * finalization support.

/* Secure Launch late validation/setup, securityfs exposure and finalization */

79 characters (max length allowed is 100).

BR, Jarkko