linux-kernel - audit trim and audit make

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Date:   Thu, 14 Jun 2018 16:31:57 -0400
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Paul Moore <paul@...l-moore.com>,
        Steve Grubb <sgrubb@...hat.com>,
        Eric Paris <eparis@...isplace.org>
Subject: audit trim and audit make_equiv

Hi Al,

I'm trying to trigger records for all the instances of
AUDIT_CONFIG_CHANGE, but I'm having trouble with a few.

AUDIT_TRIM ("auditctl -t": Trim the subtrees after a mount command.):

My reading is that should trigger at least one message (which it does)
and potentially more depending on existing tree watches and mounts via
audit_trim_trees().  I've not been able to trigger any additional ones.
What I've tried to do to trigger additional ones is to mount a
filesystem, create a subdirectory within it, set a watch on that
subdirectory, unmount the filesystem and then run a trim command.  I've
also tried the other way around, which I didn't expect to work, creating
a subdirectory, set a watch on that subdirectory, mount a filesystem on
its parent, then run a trim command.

AUDIT_MAKE_EQUIV ("auditctl -q mount-point,subtree": Make subtree
equivalent under mount point.):

The way I read this code is it should trigger at least one message
(which it does) and potentially more depending on failures of
iterate_mounts() in audit_tag_tree().  I don't know how to trigger the
latter.  Are you able to prescribe a recipe to do so?

Any insights?  Thanks!

- RGB

--
Richard Guy Briggs <rgb@...hat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635