linux-kernel - Re: [PATCH v17 17/21] ipe: enable support for fs-verity as a trust provider

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Message-ID: <20240425034233.GB1401@sol.localdomain>
Date: Wed, 24 Apr 2024 20:42:33 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: Fan Wu <wufan@...ux.microsoft.com>
Cc: corbet@....net, zohar@...ux.ibm.com, jmorris@...ei.org,
	serge@...lyn.com, tytso@....edu, axboe@...nel.dk, agk@...hat.com,
	snitzer@...nel.org, eparis@...hat.com, paul@...l-moore.com,
	linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
	linux-security-module@...r.kernel.org, fsverity@...ts.linux.dev,
	linux-block@...r.kernel.org, dm-devel@...ts.linux.dev,
	audit@...r.kernel.org, linux-kernel@...r.kernel.org,
	Deven Bowers <deven.desai@...ux.microsoft.com>
Subject: Re: [PATCH v17 17/21] ipe: enable support for fs-verity as a trust
 provider

On Fri, Apr 12, 2024 at 05:56:00PM -0700, Fan Wu wrote:
> +config IPE_PROP_FS_VERITY
> +	bool "Enable property for fs-verity files"
> +	depends on FS_VERITY && FS_VERITY_BUILTIN_SIGNATURES
> +	help
> +	  This option enables the usage of properties "fsverity_signature"
> +	  and "fsverity_digest". These properties evaluate to TRUE when
> +	  a file is fsverity enabled and has a valid builtin signature
> +	  whose signing cert is in the .fs-verity keyring or its
> +	  digest matches the supplied value in the policy.
> +
> +	  if unsure, answer Y.

Does this really need to depend on FS_VERITY_BUILTIN_SIGNATURES?  That's needed
for fsverity_signature to work, but fsverity_digest would work without it.

I'd prefer if people had the option of only turning on
FS_VERITY_BUILTIN_SIGNATURES if they really need it.

- Eric