linux-kernel - Re: [PATCH v6 0/3] SELinux support for anonymous inodes and UFFD

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Date:   Fri, 21 Aug 2020 04:35:38 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Lokesh Gidra <lokeshgidra@...gle.com>
cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...isplace.org>,
        Daniel Colascione <dancol@...col.org>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        KP Singh <kpsingh@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Thomas Cedeno <thomascedeno@...gle.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Matthew Garrett <matthewgarrett@...gle.com>,
        Aaron Goidel <acgoide@...ho.nsa.gov>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        YueHaibing <yuehaibing@...wei.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Adrian Reber <areber@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        kaleshsingh@...gle.com, calin@...gle.com, surenb@...gle.com,
        nnk@...gle.com, jeffv@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH v6 0/3] SELinux support for anonymous inodes and UFFD

On Fri, 7 Aug 2020, Lokesh Gidra wrote:

> Userfaultfd in unprivileged contexts could be potentially very
> useful. We'd like to harden userfaultfd to make such unprivileged use
> less risky. This patch series allows SELinux to manage userfaultfd
> file descriptors and in the future, other kinds of
> anonymous-inode-based file descriptor.  SELinux policy authors can
> apply policy types to anonymous inodes by providing name-based
> transition rules keyed off the anonymous inode internal name (
> "[userfaultfd]" in the case of userfaultfd(2) file descriptors) and
> applying policy to the new SIDs thus produced.

Can you expand more on why this would be useful, e.g. use-cases?


-- 
James Morris
<jmorris@...ei.org>