ACK: [CVE-2016-2117][Trustry, LTS-Utopic, Xenial] atl2: Disable unimplemented scatter/gather feature

[Christopher Arges]

On Mon, May 2, 2016 at 5:45 AM, Luis Henriques <luis.henriques at canonical.com
> wrote:

> From: Ben Hutchings <ben at decadent.org.uk>
>
> atl2 includes NETIF_F_SG in hw_features even though it has no support
> for non-linear skbs.  This bug was originally harmless since the
> driver does not claim to implement checksum offload and that used to
> be a requirement for SG.
>
> Now that SG and checksum offload are independent features, if you
> explicitly enable SG *and* use one of the rare protocols that can use
> SG without checkusm offload, this potentially leaks sensitive
> information (before you notice that it just isn't working).  Therefore
> this obscure bug has been designated CVE-2016-2117.
>
> Reported-by: Justin Yackoski <jyackoski at crypto-nite.com>
> Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
> Fixes: ec5f06156423 ("net: Kill link between CSUM and SG features.")
> Signed-off-by: David S. Miller <davem at davemloft.net>
> (cherry picked from commit f43bfaeddc79effbf3d0fcb53ca477cca66f3db8)
> CVE-2016-2117
> BugLink: https://bugs.launchpad.net/bugs/1561403
> Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
> ---
>  drivers/net/ethernet/atheros/atlx/atl2.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/atheros/atlx/atl2.c
> b/drivers/net/ethernet/atheros/atlx/atl2.c
> index 265ce1b752ed..96fe542b4acb 100644
> --- a/drivers/net/ethernet/atheros/atlx/atl2.c
> +++ b/drivers/net/ethernet/atheros/atlx/atl2.c
> @@ -1413,7 +1413,7 @@ static int atl2_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
>
>         err = -EIO;
>
> -       netdev->hw_features = NETIF_F_SG | NETIF_F_HW_VLAN_CTAG_RX;
> +       netdev->hw_features = NETIF_F_HW_VLAN_CTAG_RX;
>         netdev->features |= (NETIF_F_HW_VLAN_CTAG_TX |
> NETIF_F_HW_VLAN_CTAG_RX);
>
>         /* Init PHY as early as possible due to power saving issue  */
>
> --
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