| commit | b2f5d4dc38e034eecb7987e513255265ff9aa1cf | [log] [tgz] |
|---|---|---|
| author | Eric W. Biederman <ebiederm@xmission.com> | Sat Oct 04 14:44:03 2014 -0700 |
| committer | Eric W. Biederman <ebiederm@xmission.com> | Tue Dec 02 10:46:48 2014 -0600 |
| tree | 7a2205fdc3392feb549dfc55ce2c9f567b730936 | |
| parent | 4a44a19b470a886997d6647a77bb3e38dcbfa8c5 [diff] |
umount: Disallow unprivileged mount force Forced unmount affects not just the mount namespace but the underlying superblock as well. Restrict forced unmount to the global root user for now. Otherwise it becomes possible a user in a less privileged mount namespace to force the shutdown of a superblock of a filesystem in a more privileged mount namespace, allowing a DOS attack on root. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>