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David S. Miller 676d23690f net: Fix use after free by removing length arg from sk_data_ready callbacks. 
Several spots in the kernel perform a sequence like:

	skb_queue_tail(&sk->s_receive_queue, skb);
	sk->sk_data_ready(sk, skb->len);

But at the moment we place the SKB onto the socket receive queue it
can be consumed and freed up.  So this skb->len access is potentially
to freed up memory.

Furthermore, the skb->len can be modified by the consumer so it is
possible that the value isn't accurate.

And finally, no actual implementation of this callback actually uses
the length argument.  And since nobody actually cared about it's
value, lots of call sites pass arbitrary values in such as '0' and
even '1'.

So just remove the length argument from the callback, that way there
is no confusion whatsoever and all of these use-after-free cases get
fixed as a side effect.

Based upon a patch by Eric Dumazet and his suggestion to audit this
issue tree-wide.

Signed-off-by: David S. Miller <davem@davemloft.net>
 		2014-04-11 16:15:36 -04:00
..
Kconfig net/rds: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:40:02 -08:00
Makefile Net: rds: Makefile: Remove deprecated items 2010-11-22 08:16:15 -08:00
af_rds.c rds: Make rds_sock_lock BH rather than IRQ safe. 2012-01-24 17:03:44 -05:00
bind.c net: replace macros net_random and net_srandom with direct calls to prandom 2014-01-14 15:15:25 -08:00
cong.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
connection.c inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once 2013-10-19 19:45:35 -04:00
ib.c rds: prevent dereference of a NULL device 2013-12-27 12:33:58 -05:00
ib.h net: rds: use this_cpu_* per-cpu helper 2012-11-19 18:59:44 -05:00
ib_cm.c IB/rds: suppress incompatible protocol when version is known 2012-12-26 15:17:37 -08:00
ib_rdma.c net, rds, Replace xlist in net/rds/xlist.h with llist 2011-09-15 15:36:32 -04:00
ib_recv.c net: rds: fix per-cpu helper usage 2014-01-17 17:52:22 -08:00
ib_ring.c
…
ib_send.c rds: prevent BUG_ON triggered on congestion update to loopback 2013-12-03 11:54:18 -05:00
ib_stats.c RDS: Move atomic stats from general to ib-specific area 2010-09-08 18:12:20 -07:00
ib_sysctl.c net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
info.c rds: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:28 +08:00
info.h
…
iw.c rds: prevent dereference of a NULL device in rds_iw_laddr_check 2014-03-31 16:25:52 -04:00
iw.h net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
iw_cm.c RDS: use gfp flags from caller in conn_alloc() 2012-03-22 19:29:58 -04:00
iw_rdma.c RDS: Remove some unused iWARP code 2012-01-12 20:05:28 -08:00
iw_recv.c Merge branch 'kmap_atomic' of git://github.com/congwang/linux 2012-03-21 09:40:26 -07:00
iw_ring.c
…
iw_send.c net/rds: use prink_ratelimited() instead of printk_ratelimit() 2011-06-17 00:03:03 -04:00
iw_stats.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
iw_sysctl.c net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
loop.c RDS: use gfp flags from caller in conn_alloc() 2012-03-22 19:29:58 -04:00
loop.h
…
message.c rds: simplify a warning message 2013-03-04 14:12:07 -05:00
page.c net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
rdma.c rds: Integer overflow in RDS cmsg handling 2010-11-17 12:20:52 -08:00
rdma_transport.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
rdma_transport.h rds: make local functions/variables static 2010-10-21 04:26:39 -07:00
rds.h net: misc: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
recv.c net: add build-time checks for msg->msg_name size 2014-01-18 23:04:16 -08:00
send.c net: add build-time checks for msg->msg_name size 2014-01-18 23:04:16 -08:00
stats.c net/rds: zero last byte for strncpy 2013-03-08 00:35:44 -05:00
sysctl.c net: Convert uses of typedef ctl_table to struct ctl_table 2013-06-13 02:36:09 -07:00
tcp.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
tcp.h net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
tcp_connect.c rds: Don't disable BH on BH context 2012-08-22 22:52:04 -07:00
tcp_listen.c net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
tcp_recv.c net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
tcp_send.c rds: Don't disable BH on BH context 2012-08-22 22:52:04 -07:00
tcp_stats.c net: rds: fix const array syntax 2011-07-01 16:16:19 -07:00
threads.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
transport.c RDS: have sockets get transport module references 2010-09-08 18:16:47 -07:00