linux-kernel - Re: [PATCH v10 3/3] Use secure anon inodes for userfaultfd

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Date:   Wed, 4 Nov 2020 12:36:31 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Lokesh Gidra <lokeshgidra@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        James Morris <jmorris@...ei.org>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Casey Schaufler <casey@...aufler-ca.com>,
        "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,
        Daniel Colascione <dancol@...gle.com>
Subject: Re: [PATCH v10 3/3] Use secure anon inodes for userfaultfd

On Sun, Oct 11, 2020 at 01:29:36AM -0700, Lokesh Gidra wrote:
> From: Daniel Colascione <dancol@...gle.com>
> 
> This change gives userfaultfd file descriptors a real security
> context, allowing policy to act on them.
> 
> Signed-off-by: Daniel Colascione <dancol@...gle.com>
> 
> [Remove owner inode from userfaultfd_ctx]
> [Use anon_inode_getfd_secure() instead of anon_inode_getfile_secure()
>  in userfaultfd syscall]
> [Use inode of file in userfaultfd_read() in resolve_userfault_fork()]
> 
> Signed-off-by: Lokesh Gidra <lokeshgidra@...gle.com>
> ---

I'm not an expert in userfaultfd or SELinux, but I don't see any issues with
this patch, and the comments I made earlier were resolved (except for the patch
title which I just pointed out -- it should have "userfaultfd:" prefix).

So feel free to add:

Reviewed-by: Eric Biggers <ebiggers@...gle.com>