Sabrina Dubroca fcd91dd449 net: add recursion limit to GRO ... Currently, GRO can do unlimited recursion through the gro_receive handlers. This was fixed for tunneling protocols by limiting tunnel GRO to one level with encap_mark, but both VLAN and TEB still have this problem. Thus, the kernel is vulnerable to a stack overflow, if we receive a packet composed entirely of VLAN headers. This patch adds a recursion counter to the GRO layer to prevent stack overflow. When a gro_receive function hits the recursion limit, GRO is aborted for this skb and it is processed normally. This recursion counter is put in the GRO CB, but could be turned into a percpu counter if we run out of space in the CB. Thanks to Vladimír Beneš <vbenes@redhat.com> for the initial bug report. Fixes: CVE-2016-7039 Fixes: 9b174d88c2 ("net: Add Transparent Ethernet Bridging GRO support.") Fixes: 66e5133f19 ("vlan: Add GRO support for non hardware accelerated vlan") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Reviewed-by: Jiri Benc <jbenc@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-10-20 14:32:22 -04:00
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Kconfig	8021q: update description	2014-01-21 17:01:25 -08:00
Makefile	net/8021q: Implement Multiple VLAN Registration Protocol (MVRP)	2013-02-10 20:37:22 -05:00
vlan.c	net: add recursion limit to GRO	2016-10-20 14:32:22 -04:00
vlan.h	vlan: Propagate MAC address to VLANs	2016-05-31 11:56:48 -07:00
vlan_core.c	vlan: Do not put vlan headers back on bridge and macvlan ports	2015-11-17 14:38:35 -05:00
vlan_dev.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-07-24 00:53:32 -04:00
vlan_gvrp.c	net: vlan: prepare for 802.1ad support	2013-04-19 14:45:27 -04:00
vlan_mvrp.c	net: vlan: prepare for 802.1ad support	2013-04-19 14:45:27 -04:00
vlan_netlink.c	vlan: use a valid default mtu value for vlan over macsec	2016-07-16 20:15:02 -07:00
vlanproc.c	vlan: change return type of vlan_proc_rem_dev	2016-02-17 22:06:28 -05:00
vlanproc.h	vlan: change return type of vlan_proc_rem_dev	2016-02-17 22:06:28 -05:00