[Devel] [PATCH rh7 v3 2/2] fs: Allow to mount ext4 and binfmt_misc under non-root ns

[Vladimir Davydov]

On Tue, Oct 06, 2015 at 12:35:51PM +0300, Kirill Tkhai wrote:
...
> @@ -735,6 +735,8 @@ static int bm_fill_super(struct super_block * sb, void * data, int silent)
>  static struct dentry *bm_mount(struct file_system_type *fs_type,
>  	int flags, const char *dev_name, void *data)
>  {
> +	if (!current_user_ns_initial())
> +		return ERR_PTR(-EPERM);

FWIW, I think we should use this new nice helper in dev_mount too
instead of open-coding the ve->init_cred->user_ns check.

>  	return mount_ns(fs_type, flags, get_exec_env(), bm_fill_super);
>  }
>