linux-kernel - Re: [RFC PATCH 0/5] allow unprivileged overlay mounts

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Message-ID: <CAJfpegt_haMDwd6jo3mQzX2vchk_LLMH+V+h4yDs7geLmo4NhA@mail.gmail.com>
Date:   Mon, 25 Nov 2019 16:14:01 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Miklos Szeredi <mszeredi@...hat.com>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] allow unprivileged overlay mounts

On Fri, Oct 25, 2019 at 3:43 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> Miklos Szeredi <mszeredi@...hat.com> writes:
>
> > Hi Eric,
> >
> > Can you please have a look at this patchset?
> >
> > The most interesting one is the last oneliner adding FS_USERNS_MOUNT;
> > whether I'm correct in stating that this isn't going to introduce any
> > holes, or not...
>
> I will take some time and dig through this.
>
> From a robustness standpoint I worry about the stackable filesystem
> side.  As that is uniquely an attack vector with overlayfs.
>
> There is definitely demand for this.

Hi Eric,

Have you had time to look into this yet?

Thanks,
Miklos