linux-kernel - Re: [PATCH] fs/namespace: fix unprivileged mount propagation

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Message-ID: <20190617185208.3qij2fl7acwuewy3@brauner.io>
Date:   Mon, 17 Jun 2019 20:52:09 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] fs/namespace: fix unprivileged mount propagation

On Mon, Jun 17, 2019 at 11:50:13AM -0700, Linus Torvalds wrote:
> On Mon, Jun 17, 2019 at 11:47 AM Christian Brauner <christian@...uner.io> wrote:
> >
> > When propagating mounts across mount namespaces owned by different user
> > namespaces it is not possible anymore to move or umount the mount in the
> > less privileged mount namespace.
> 
> I will wait a short while in the hope of getting Al's ack for this,
> but since it looks about as good as it likely can be, I suspect I'll
> just apply it later today even without such an ack..

Thanks!
Note that I stupidly messed up whitespace by accidently adding an
additional newline. I'll just send a v1 that fixes this nonsense.

Christian