user/sven/linux.git/include/linux/mount.h, branch v3.12.13

vfs: Lock in place mounts from more privileged users

2013-07-24T16:14:46Z

When creating a less privileged mount namespace or propogating mounts from a more privileged to a less privileged mount namespace lock the submounts so they may not be unmounted individually in the child mount namespace revealing what is under them. This enforces the reasonable expectation that it is not possible to see under a mount point. Most of the time mounts are on empty directories and revealing that does not matter, however I have seen an occassionaly sloppy configuration where there were interesting things concealed under a mount point that probably should not be revealed. Expirable submounts are not locked because they will eventually unmount automatically so whatever is under them already needs to be safe for unprivileged users to access. From a practical standpoint these restrictions do not appear to be significant for unprivileged users of the mount namespace. Recursive bind mounts and pivot_root continues to work, and mounts that are created in a mount namespace may be unmounted there. All of which means that the common idiom of keeping a directory of interesting files and using pivot_root to throw everything else away continues to work just fine. Acked-by: Serge Hallyn Acked-by: Andy Lutomirski Signed-off-by: "Eric W. Biederman"

vfs: Add a mount flag to lock read only bind mounts

2013-03-27T14:50:04Z

When a read-only bind mount is copied from mount namespace in a higher privileged user namespace to a mount namespace in a lesser privileged user namespace, it should not be possible to remove the the read-only restriction. Add a MNT_LOCK_READONLY mount flag to indicate that a mount must remain read-only. CC: stable@vger.kernel.org Acked-by: Serge Hallyn Signed-off-by: "Eric W. Biederman"

vfs: move fsnotify junk to struct mount

2012-01-04T03:57:12Z

Signed-off-by: Al Viro

vfs: move mnt_devname

2012-01-04T03:57:11Z

Signed-off-by: Al Viro

vfs: move mnt_list to struct mount

2012-01-04T03:57:11Z

Signed-off-by: Al Viro

vfs: move the rest of int fields to struct mount

2012-01-04T03:57:10Z

Signed-off-by: Al Viro

vfs: mnt_id/mnt_group_id moved

2012-01-04T03:57:10Z

Signed-off-by: Al Viro

vfs: mnt_ns moved to struct mount

2012-01-04T03:57:09Z

Signed-off-by: Al Viro

vfs: take mnt_share/mnt_slave/mnt_slave_list and mnt_expire to struct mount

2012-01-04T03:57:08Z

Signed-off-by: Al Viro

vfs: take mnt_master to struct mount

2012-01-04T03:57:08Z

make IS_MNT_SLAVE take struct mount * at the same time Signed-off-by: Al Viro