Enable unprivileged user namespace mounts of overlayfs. Overlayfs's
permission model (*) ensures that the mounter itself cannot gain additional
privileges by the act of creating an overlayfs mount.
This feature request is coming from the "rootless" container crowd.
(*) Documentation/filesystems/overlayfs.txt#Permission model
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
---
fs/overlayfs/super.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index d122c07f2a43..c7f21a049c6b 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1739,6 +1739,7 @@ static struct dentry *ovl_mount(struct file_system_type *fs_type, int flags,
static struct file_system_type ovl_fs_type = {
.owner = THIS_MODULE,
.name = "overlay",
+ .fs_flags = FS_USERNS_MOUNT,
.mount = ovl_mount,
.kill_sb = kill_anon_super,
};
--
2.21.0
