On Tue, 2017-02-07 at 15:57 -0500, Willem de Bruijn wrote:
> From: Willem de Bruijn <will...@google.com>
>
> The stack must not pass packets to device drivers that are shorter
> than the minimum link layer header length.
>
> Previously, packet sockets would drop packets smaller than or equal
> to dev->hard_header_len, but this has false positives. Zero length
> payload is used over Ethernet. Other link layer protocols support
> variable length headers. Support for validation of these protocols
> removed the min length check for all protocols.
>
> Introduce an explicit dev->min_header_len parameter and drop all
> packets below this value. Initially, set it to non-zero only for
> Ethernet and loopback. Other protocols can follow in a patch to
> net-next.
>
> Fixes: 9ed988cd5915 ("packet: validate variable length ll headers")
> Reported-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
> Signed-off-by: Willem de Bruijn <will...@google.com>
> ---
Acked-by: Eric Dumazet <eduma...@google.com>
