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net: Reset secmark when scrubbing packet

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skb_scrub_packet() is called when a packet switches between a context
such as between underlay and overlay, between namespaces, or between
L3 subnets.

While we already scrub the packet mark, connection tracking entry,
and cached destination, the security mark/context is left intact.

It seems wrong to inherit the security context of a packet when going
from overlay to underlay or across forwarding paths.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2014-12-23 01:13:18 +01:00 committed by David S. Miller
parent 796f2da81b
commit b8fb4e0648
1 changed files with 1 additions and 0 deletions
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1
net/core/skbuff.c
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@ -4148,6 +4148,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
skb->ignore_df = 0;
skb_dst_drop(skb);
skb->mark = 0;
skb_init_secmark(skb);
secpath_reset(skb);
nf_reset(skb);
nf_reset_trace(skb);