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58 lines
2.2 KiB
58 lines
2.2 KiB
8 years ago
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From 51106cb1fd14dfbf62c2760921463376f56ac732 Mon Sep 17 00:00:00 2001
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From: Bogdan Purcareata <bogdan.purcareata@nxp.com>
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Date: Tue, 21 Jun 2016 18:40:47 +0000
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Subject: [PATCH 205/226] fsl-dpaa2: eth: sanitize supported private flags
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On linux-v4.6 with CONFIG_MACVLAN=y, when bringing up a ni interface, the
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network stack crashes due to a segfault. This is related to the
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macvlan_device_event notifier, which registers itself to all the network
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interface in the system.
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The notifier reads the netdev private flags and incorrectly qualifies
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the interface as a macvlan port, since both the IFF_MACVLAN_PORT and
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IFF_PROMISC flags have the same offset. Code spelunking reveals that
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IFF_PROMISC is only used as an interface flag, not a private interface
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flag.
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A similar situation happens with IFF_ALLMULTI, which overlaps with
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IFF_BRIDGE_PORT. No info on the consequences of this, since I haven't
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tested bridge scenarios. The interface can still be set in allmulti
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mode using userspace tools (e.g. ifconfig).
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IFF_MULTICAST overlaps with IFF_UNICAST_FLT, therefore the current code
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has no effect as it is. The closest multicast activation based on device
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capabilities has been seen in the case of the Aeroflex Gaisler Ethernet
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MAC (aeroflex/greth.c) - here, the runtime (not private) flag is set on
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device probe. On a side node, ether_setup enables IFF_MULTICAST by default.
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Remove IFF_PROMISC, IFF_ALLMULTI and IFF_MULTICAST from device capabilities
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init.
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Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com>
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---
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drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c | 7 +------
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1 file changed, 1 insertion(+), 6 deletions(-)
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--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
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+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
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@@ -1176,18 +1176,13 @@ static int dpaa2_eth_init(struct net_dev
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u32 options = priv->dpni_attrs.options;
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/* Capabilities listing */
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- supported |= IFF_LIVE_ADDR_CHANGE | IFF_PROMISC | IFF_ALLMULTI;
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+ supported |= IFF_LIVE_ADDR_CHANGE;
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if (options & DPNI_OPT_UNICAST_FILTER)
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supported |= IFF_UNICAST_FLT;
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else
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not_supported |= IFF_UNICAST_FLT;
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- if (options & DPNI_OPT_MULTICAST_FILTER)
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- supported |= IFF_MULTICAST;
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- else
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- not_supported |= IFF_MULTICAST;
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-
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net_dev->priv_flags |= supported;
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net_dev->priv_flags &= ~not_supported;
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