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atl2: Disable unimplemented scatter/gather feature

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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@crypto-nite.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Fixes: ec5f061564 ("net: Kill link between CSUM and SG features.")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2016-04-20 23:23:08 +01:00 committed by David S. Miller
parent 669c00c009
commit f43bfaeddc
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/atheros/atlx/atl2.c
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@ -1412,7 +1412,7 @@ 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 */