On Thu, Jun 20, 2024 at 5:12 AM Roberto Sassu
[off-list ref] wrote:

On Wed, 2024-06-19 at 14:43 -0400, Paul Moore wrote:

quoted

On Wed, Jun 19, 2024 at 12:38 PM Roberto Sassu
[off-list ref] wrote:

quoted

Making it a kernel subsystem would likely mean replicating what the LSM
infrastructure is doing, inode (security) blob and being notified about
file/directory changes.

Just because the LSM framework can be used for something, perhaps it
even makes the implementation easier, it doesn't mean the framework
should be used for everything.

It is supporting 3 LSMs: IMA, IPE and BPF LSM.

That makes it a clear target for the security subsystem, and as you
suggested to start for IMA, if other kernel subsystems require them, we
can make it as an independent subsystem.

Have you discussed the file digest cache functionality with either the
IPE or BPF LSM maintainers?  While digest_cache may support these
LSMs, I don't recall seeing any comments from the other LSM
developers; if you are going to advocate for this as something outside
of IMA, it would be good to see a show of support for the other LSMs.

-- 
paul-moore.com