Fix incorrect vmcore permissions when dumped through ssh
    
    Related: rhbz#1938165
    Upstream: fedora
    Conflict: none
    
    commit 00785873ef364dcbca8765ba22a48a01bdd4fca5
    Author: Tao Liu <ltao@redhat.com>
    Date:   Fri Mar 19 18:07:51 2021 +0800
    
        Fix incorrect vmcore permissions when dumped through ssh
    
        Previously when dumping vmcore to a remote machine through ssh,
        the files are created remotely and file permissions are taken
        from the default umask value, which making the files accessible to
        anyone on the remote machine.
    
        This patch fixed the security issue by setting a customized umask value
        before the file creation on the remote machine.
    
        Signed-off-by: Tao Liu <ltao@redhat.com>
        Acked-by: Kairui Song <kasong@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>