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

[Amir Goldstein]

On Tue, Jan 30, 2024 at 11:46 PM Stefan Berger <stefanb@xxxxxxxxxxxxx> 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.