linux-kernel - Re: [PATCH 0/5] evm: Support signatures on stacked filesystem

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Date: Wed, 31 Jan 2024 15:18:53 +0200
From: Amir Goldstein <amir73il@...il.com>
To: Stefan Berger <stefanb@...ux.ibm.com>
Cc: linux-integrity@...r.kernel.org, linux-security-module@...r.kernel.org, 
	linux-unionfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com, zohar@...ux.ibm.com, 
	roberto.sassu@...wei.com, miklos@...redi.hu
Subject: Re: [PATCH 0/5] evm: Support signatures on stacked filesystem

On Tue, Jan 30, 2024 at 11:46 PM Stefan Berger <stefanb@...ux.ibm.com> wrote:
>
> EVM has recently been completely disabled on unsupported (e.g.,
> overlayfs). This series now enables copy-up of "portable and immutable"
> signatures on those filesystems and enables the enforcement of
> "portable and immutable" as well as the "original" signatures on
> previously unsupported filesystem when EVM is enabled with EVM_INIT_X509.
> HMAC verification and generation remains disabled on those filesystems.
>

I am missing a high level description of what is in those "portable
and immutable"
signatures and how those signatures remain valid across copy up.

Thanks,
Amir.