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linux/net/core
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hannes@stressinduktion.org c91f81773c ipv6: protect skb->sk accesses from recursive dereference inside the stack 
[ Upstream commit f60e5990d9 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-04-29 10:31:46 +02:00
..
datagram.c net, datagram: fix the incorrect comment in zerocopy_sg_from_iovec() 2013-10-29 00:19:04 -04:00
dev.c ipv6: protect skb->sk accesses from recursive dereference inside the stack 2015-04-29 10:31:46 +02:00
dev_addr_lists.c net: Correctly sync addresses from multiple sources to single device 2014-01-23 13:06:34 -08:00
dev_ioctl.c net_tstamp: Add SIOCGHWTSTAMP ioctl to match SIOCSHWTSTAMP 2013-11-19 19:07:21 +00:00
drop_monitor.c net: drop_monitor: fix the value of maxattr 2013-12-09 21:10:38 -05:00
dst.c ipv4: fix dst race in sk_dst_get() 2014-07-28 08:05:59 -07:00
ethtool.c net: Add layer 2 hardware acceleration operations for macvlan devices 2013-11-07 19:11:41 -05:00
fib_rules.c net: fix 'ip rule' iif/oif device rename 2014-02-09 19:02:52 -08:00
filter.c filter: prevent nla extensions to peek beyond the end of the message 2014-05-31 13:20:33 -07:00
flow.c net: delete __cpuinit usage from all net files 2013-07-14 19:36:58 -04:00
flow_dissector.c netdevice: move netdev_cap_txqueue for shared usage to header 2014-02-17 00:36:34 -05:00
gen_estimator.c net_sched: add 64bit rate estimators 2013-06-11 02:51:03 -07:00
gen_stats.c gen_stats.c: Duplicate xstats buffer for later use 2015-03-18 13:31:21 +01:00
iovec.c iovec: make sure the caller actually wants anything in memcpy_fromiovecend 2014-08-14 09:38:24 +08:00
link_watch.c net: make all team port device link events urgent 2013-06-13 02:31:41 -07:00
Makefile net: netprio: rename config to be more consistent with cgroup configs 2014-01-03 23:41:42 +01:00
neighbour.c neigh: set nud_state to NUD_INCOMPLETE when probing router reachability 2014-05-31 13:20:37 -07:00
net-procfs.c rps: selective flow shedding during softnet overflow 2013-05-20 13:48:04 -07:00
net-sysfs.c net: fix "queues" uevent between network namespaces 2014-01-19 20:02:02 -08:00
net-sysfs.h net: netdev_kobject_init: annotate with __init 2014-01-05 20:27:54 -05:00
net-traces.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
net_namespace.c rtnetlink: wait for unregistering devices in rtnl_link_unregister() 2014-05-31 13:20:38 -07:00
netclassid_cgroup.c net: net_cls: move cgroupfs classid handling into core 2014-01-03 23:41:41 +01:00
netevent.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
netpoll.c net: Always untag vlan-tagged traffic on input. 2014-10-15 08:36:40 +02:00
netprio_cgroup.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
pktgen.c pktgen: fix UDP checksum computation 2015-03-18 13:31:21 +01:00
request_sock.c tcp: fix a panic on UP machines in reqsk_fastopen_remove 2013-01-14 18:10:05 -05:00
rtnetlink.c rtnetlink: call ->dellink on failure when ->newlink exists 2015-03-18 13:31:21 +01:00
scm.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2013-09-07 14:35:32 -07:00
secure_seq.c inetpeer: get rid of ip_id_count 2014-08-14 09:38:23 +08:00
skbuff.c net: Reset secmark when scrubbing packet 2015-01-27 08:18:53 -08:00
sock.c ipv6: protect skb->sk accesses from recursive dereference inside the stack 2015-04-29 10:31:46 +02:00
sock_diag.c net: Move the permission check in sock_diag_put_filterinfo to packet_diag_dump 2014-06-26 15:15:38 -04:00
stream.c net: replace macros net_random and net_srandom with direct calls to prandom 2014-01-14 15:15:25 -08:00
sysctl_net_core.c net: sysctl_net_core: check SNDBUF and RCVBUF for min length 2015-03-26 15:06:50 +01:00
timestamping.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
user_dma.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
utils.c net: avoid dependency of net_get_random_once on nop patching 2014-05-31 13:20:38 -07:00