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| author | hannes@stressinduktion.org <hannes@stressinduktion.org> | 2015-04-01 17:07:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-04-06 22:12:49 +0200 |
| commit | f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 (patch) | |
| tree | bba5ed057073e42c0113473e1cdbff0bc46ab875 /fs/block_dev.c | |
| parent | netns: don't allocate an id for dead netns (diff) | |
| download | linux-f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90.tar.xz linux-f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90.zip | |
ipv6: protect skb->sk accesses from recursive dereference inside the stack
We should not consult skb->sk for output decisions in xmit recursion
levels > 0 in the stack. Otherwise local socket settings could influence
the result of e.g. tunnel encapsulation process.
ipv6 does not conform with this in three places:
1) ip6_fragment: we do consult ipv6_npinfo for frag_size
2) sk_mc_loop in ipv6 uses skb->sk and checks if we should
loop the packet back to the local socket
3) ip6_skb_dst_mtu could query the settings from the user socket and
force a wrong MTU
Furthermore:
In sk_mc_loop we could potentially land in WARN_ON(1) if we use a
PF_PACKET socket ontop of an IPv6-backed vxlan device.
Reuse xmit_recursion as we are currently only interested in protecting
tunnel devices.
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/block_dev.c')
0 files changed, 0 insertions, 0 deletions