linux-kernel - Re: [PATCH v6 02/14] Documentation/x86: Secure Launch kernel documentation

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Message-ID: <20230512104753.GA14461@srcf.ucam.org>
Date:   Fri, 12 May 2023 11:47:53 +0100
From:   Matthew Garrett <mjg59@...f.ucam.org>
To:     Ross Philipson <ross.philipson@...cle.com>
Cc:     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,
        dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, ardb@...nel.org,
        James.Bottomley@...senpartnership.com, luto@...capital.net,
        nivedita@...m.mit.edu, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v6 02/14] Documentation/x86: Secure Launch kernel
 documentation

On Thu, May 04, 2023 at 02:50:11PM +0000, Ross Philipson wrote:
> +Secure Launch does not interoperate with KASLR. If possible, the MLE should be
> +built with KASLR disabled::

Why does Secure Launch not interoperate with KASLR?

Re: IOMMUs

> +It is recommended that no other command line options should be set to override
> +the defaults above.

What happens if they are? Does doing so change the security posture of 
the system? If so, will the measurements be different in a way that 
demonstrates the system is in an insecure state?