From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Date: Thu, 07 May 2015 10:52:06 -0700 Subject: [Intel-wired-lan] [PATCH v1 net-next 2/2] igb: support SIOCSMIIREG In-Reply-To: <1429302240-654-2-git-send-email-jtoppins@cumulusnetworks.com> References: <1429302240-654-1-git-send-email-jtoppins@cumulusnetworks.com> <1429302240-654-2-git-send-email-jtoppins@cumulusnetworks.com> Message-ID: <554BA646.1060000@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: On 04/17/2015 01:24 PM, Jonathan Toppins wrote: > From: Alan Liebthal > > Support setting the MII register via SIOCSMIIREG. > > Signed-off-by: Alan Liebthal > Signed-off-by: Jonathan Toppins > --- > drivers/net/ethernet/intel/igb/igb_main.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c > index 720b785..1071a71 100644 > --- a/drivers/net/ethernet/intel/igb/igb_main.c > +++ b/drivers/net/ethernet/intel/igb/igb_main.c > @@ -7141,6 +7141,11 @@ static int igb_mii_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) > return -EIO; > break; > case SIOCSMIIREG: > + adapter->hw.phy.addr = data->phy_id; > + if (igb_write_phy_reg(&adapter->hw, data->reg_num & 0x1F, > + data->val_in)) > + return -EIO; > + break; > default: > return -EOPNOTSUPP; > } How and why is this being used? From what I can tell it looks like it is an easy way to break any of the existing interfaces if it is misused since all you would need to do is specify a phy address that doesn't match the existing PHY in the system and then you would likely lose link, or possibly mess up the configuration on the system requiring. I suspect this is a back door for some piece of user space code that is being given far more permission than it should be. - Alex