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Date:   Thu, 24 May 2018 07:58:32 -0500
From:   Seth Forshee <seth.forshee@canonical.com>
To:     "Eric W. Biederman" <ebiederm@xmission.com>
Cc:     Linux Containers <containers@lists.linux-foundation.org>,
        linux-fsdevel@vger.kernel.org,
        "Serge E. Hallyn" <serge@hallyn.com>,
        Christian Brauner <christian@brauner.io>,
        linux-kernel@vger.kernel.org
Subject: Re: [REVIEW][PATCH 1/6] vfs: Don't allow changing the link count of
 an inode with an invalid uid or gid
Message-ID: <20180524125832.GP3401@ubuntu-xps13>
References: <87o9h6554f.fsf@xmission.com>
 <20180523232538.4880-1-ebiederm@xmission.com>
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On Wed, May 23, 2018 at 06:25:33PM -0500, Eric W. Biederman wrote:
> Changing the link count of an inode via unlink or link will cause a
> write back of that inode.  If the uids or gids are invalid (aka not known
> to the kernel) writing the inode back may change the uid or gid in the
> filesystem.   To prevent possible filesystem and to avoid the need for
> filesystem maintainers to worry about it don't allow operations on
> inodes with an invalid uid or gid.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

Acked-by: Seth Forshee <seth.forshee@canonical.com>