Willem de Bruijn 4f0c40d944 dccp: limit sk_filter trim to payload ... Dccp verifies packet integrity, including length, at initial rcv in dccp_invalid_packet, later pulls headers in dccp_enqueue_skb. A call to sk_filter in-between can cause __skb_pull to wrap skb->len. skb_copy_datagram_msg interprets this as a negative value, so (correctly) fails with EFAULT. The negative length is reported in ioctl SIOCINQ or possibly in a DCCP_WARN in dccp_close. Introduce an sk_receive_skb variant that caps how small a filter program can trim packets, and call this in dccp with the header length. Excessively trimmed packets are now processed normally and queued for reception as 0B payloads. Fixes: 7c657876b6 ("[DCCP]: Initial implementation") Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-07-13 11:53:41 -07:00
..
ccids
ackvec.c	dccp: drop null test before destroy functions	2015-09-15 16:49:43 -07:00
ackvec.h
ccid.c	dccp: drop null test before destroy functions	2015-09-15 16:49:43 -07:00
ccid.h
dccp.h	net: snmp: kill STATS_BH macros	2016-04-27 22:48:25 -04:00
diag.c
feat.c
feat.h
input.c	dccp: do not assume DCCP code is non preemptible	2016-05-02 17:02:25 -04:00
ipv4.c	dccp: limit sk_filter trim to payload	2016-07-13 11:53:41 -07:00
ipv6.c	dccp: limit sk_filter trim to payload	2016-07-13 11:53:41 -07:00
ipv6.h
Kconfig
Makefile
minisocks.c	dccp: rename DCCP_INC_STATS_BH()	2016-04-27 22:48:22 -04:00
options.c	dccp: do not assume DCCP code is non preemptible	2016-05-02 17:02:25 -04:00
output.c	net: Generalise wq_has_sleeper helper	2015-11-30 14:47:33 -05:00
probe.c	Use 64-bit timekeeping	2015-11-01 17:01:16 -05:00
proto.c	net: rename SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA	2015-12-01 15:45:05 -05:00
qpolicy.c
sysctl.c
timer.c	net: rename NET_{ADD|INC}_STATS_BH()	2016-04-27 22:48:24 -04:00