linux-kernel - Re: [PATCH v13 00/19] x86: Trenchboot secure dynamic launch Linux kernel support

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Message-ID: <1370ee6f-fe47-4789-9bae-d6031eab082d@oracle.com>
Date: Sat, 29 Mar 2025 13:46:35 -0700
From: ross.philipson@...cle.com
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-crypto@...r.kernel.org, kexec@...ts.infradead.org,
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        ardb@...nel.org, mjg59@...f.ucam.org,
        James.Bottomley@...senpartnership.com, peterhuewe@....de, jgg@...pe.ca,
        luto@...capital.net, nivedita@...m.mit.edu,
        herbert@...dor.apana.org.au, davem@...emloft.net, corbet@....net,
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        kanth.ghatraju@...cle.com, andrew.cooper3@...rix.com,
        trenchboot-devel@...glegroups.com, ross.philipson@...cle.com
Subject: Re: [PATCH v13 00/19] x86: Trenchboot secure dynamic launch Linux
 kernel support

On 3/29/25 4:32 AM, Jarkko Sakkinen wrote:
> On Fri, Mar 28, 2025 at 04:07:55PM -0700, Ross Philipson wrote:
>> The larger focus of the TrenchBoot project (https://urldefense.com/v3/__https://github.com/TrenchBoot__;!!ACWV5N9M2RV99hQ!O3YD_Gg-b5rJB_LxeqAKq7YGMDlmbkk1dUS2khRWPxGpRgR36kf2jpRZPcmqJD83GOvjam2SUAJ1J5iy914$ ) is to
>> enhance the boot security and integrity in a unified manner. The first area of
>> focus has been on the Trusted Computing Group's Dynamic Launch for establishing
>> a hardware Root of Trust for Measurement, also know as DRTM (Dynamic Root of
>> Trust for Measurement). The project has been and continues to work on providing
>> a unified means to Dynamic Launch that is a cross-platform (Intel and AMD) and
>> cross-architecture (x86 and Arm), with our recent involvment in the upcoming
>> Arm DRTM specification. The order of introducing DRTM to the Linux kernel
>> follows the maturity of DRTM in the architectures. Intel's Trusted eXecution
>> Technology (TXT) is present today and only requires a preamble loader, e.g. a
>> boot loader, and an OS kernel that is TXT-aware. AMD DRTM implementation has
>> been present since the introduction of AMD-V but requires an additional
>> component that is AMD specific and referred to in the specification as the
>> Secure Loader, which the TrenchBoot project has an active prototype in
>> development. Finally Arm's implementation is in specification development stage
>> and the project is looking to support it when it becomes available.
>>
>> This patchset provides detailed documentation of DRTM, the approach used for
>> adding the capbility, and relevant API/ABI documentation. In addition to the
>> documentation the patch set introduces Intel TXT support as the first platform
>> for Linux Secure Launch.
>>
>> A quick note on terminology. The larger open source project itself is called
>> TrenchBoot, which is hosted on Github (links below). The kernel feature enabling
>> the use of Dynamic Launch technology is referred to as "Secure Launch" within
>> the kernel code. As such the prefixes sl_/SL_ or slaunch/SLAUNCH will be seen
>> in the code. The stub code discussed above is referred to as the SL stub.
> 
> I did a quick recap of TPM patches and still looks good as far as I'm
> concerned. Not actively reviewing these anymore but I'll do a sanity
> check per patch set version.

Thank you Jarkko for all you feedback and help.

Ross

> 
> BR, Jarkko