Tom Parkin 80d84ef3ff l2tp: prevent l2tp_tunnel_delete racing with userspace close ... If a tunnel socket is created by userspace, l2tp hooks the socket destructor in order to clean up resources if userspace closes the socket or crashes. It also caches a pointer to the struct sock for use in the data path and in the netlink interface. While it is safe to use the cached sock pointer in the data path, where the skb references keep the socket alive, it is not safe to use it elsewhere as such access introduces a race with userspace closing the socket. In particular, l2tp_tunnel_delete is prone to oopsing if a multithreaded userspace application closes a socket at the same time as sending a netlink delete command for the tunnel. This patch fixes this oops by forcing l2tp_tunnel_delete to explicitly look up a tunnel socket held by userspace using sockfd_lookup(). Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-01-29 15:43:02 -05:00
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Kconfig	l2tp: fix compile error when CONFIG_IPV6=m and CONFIG_L2TP=y	2012-09-21 12:06:46 -04:00
l2tp_core.c	l2tp: prevent l2tp_tunnel_delete racing with userspace close	2013-01-29 15:43:02 -05:00
l2tp_core.h	l2tp: prevent l2tp_tunnel_delete racing with userspace close	2013-01-29 15:43:02 -05:00
l2tp_debugfs.c	net: l2tp: Standardize logging styles	2012-05-17 04:34:38 -04:00
l2tp_eth.c	l2tp: fix oops in l2tp_eth_create() error path	2012-11-02 21:56:35 -04:00
l2tp_ip6.c	l2tp: fix info leak via getsockname()	2012-08-15 21:36:31 -07:00
l2tp_ip.c	l2tp: fix a race in l2tp_ip_sendmsg()	2012-06-08 14:30:51 -07:00
l2tp_netlink.c	l2tp: session is an array not a pointer	2012-10-26 03:46:41 -04:00
l2tp_ppp.c	net: Remove casts to same type	2012-06-04 11:45:11 -04:00
Makefile	l2tp: introduce L2TPv3 IP encapsulation support for IPv6	2012-05-01 09:30:55 -04:00