linux-ext4 - Re: [PATCH v2 31/39] audit: handle idmapped mounts

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Date:   Sun, 22 Nov 2020 17:17:39 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        linux-fsdevel@...r.kernel.org,
        John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Geoffrey Thomas <geofft@...reload.com>,
        Mrunal Patel <mpatel@...hat.com>,
        Josh Triplett <josh@...htriplett.org>,
        Andy Lutomirski <luto@...nel.org>,
        Theodore Tso <tytso@....edu>, Alban Crequy <alban@...volk.io>,
        Tycho Andersen <tycho@...ho.ws>,
        David Howells <dhowells@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Jann Horn <jannh@...gle.com>,
        Seth Forshee <seth.forshee@...onical.com>,
        Stéphane Graber <stgraber@...ntu.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Lennart Poettering <lennart@...ttering.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>, smbarber@...omium.org,
        Phil Estes <estesp@...il.com>, Serge Hallyn <serge@...lyn.com>,
        Kees Cook <keescook@...omium.org>,
        Todd Kjos <tkjos@...gle.com>, Jonathan Corbet <corbet@....net>,
        containers@...ts.linux-foundation.org,
        linux-security-module@...r.kernel.org, linux-api@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-audit@...hat.com,
        linux-integrity@...r.kernel.org, selinux@...r.kernel.org
Subject: Re: [PATCH v2 31/39] audit: handle idmapped mounts

On Sun, Nov 15, 2020 at 5:43 AM Christian Brauner
<christian.brauner@...ntu.com> wrote:
>
> Audit will sometimes log the inode's i_uid and i_gid. Enable audit to log the
> mapped inode when it is accessed from an idmapped mount.

I mentioned this in an earlier patch in this patchset, but it is worth
repeating here: audit currently records information in the context of
the initial/host namespace and I believe it should probably stay that
way until the rest of the namespace smarts that Richard is working on
is merged.  If we do change the context of the inode's UID and GID
information it has the potential to create a rather odd looking audit
record with inconsistent credentials and the filters would yield some
very interesting results.

> Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
> ---
> /* v2 */
> unchanged
> ---
>  fs/namei.c            | 14 +++++++-------
>  include/linux/audit.h | 10 ++++++----
>  ipc/mqueue.c          |  8 ++++----
>  kernel/auditsc.c      | 26 ++++++++++++++------------
>  4 files changed, 31 insertions(+), 27 deletions(-)

-- 
paul moore
www.paul-moore.com