linux/net/rxrpc
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
..
af_rxrpc.c af_rxrpc: Add sysctls for configuring RxRPC parameters 2014-02-26 17:25:06 +00:00
ar-accept.c
ar-ack.c af_rxrpc: Expose more RxRPC parameters via sysctls 2014-02-26 17:25:07 +00:00
ar-call.c af_rxrpc: Keep rxrpc_call pointers in a hashtable 2014-03-04 10:36:53 +00:00
ar-connection.c af_rxrpc: Add sysctls for configuring RxRPC parameters 2014-02-26 17:25:06 +00:00
ar-connevent.c
ar-error.c af_rxrpc: Fix UDP MTU calculation from ICMP_FRAG_NEEDED 2014-02-26 17:25:01 +00:00
ar-input.c net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
ar-internal.h net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
ar-key.c
ar-local.c
ar-output.c af_rxrpc: Request an ACK for every alternate DATA packet 2014-02-26 17:25:07 +00:00
ar-peer.c
ar-proc.c
ar-recvmsg.c af_rxrpc: Remove incorrect checksum calculation from rxrpc_recvmsg() 2014-02-07 18:58:43 +00:00
ar-security.c
ar-skbuff.c af_rxrpc: Improve ACK production 2014-02-26 17:25:07 +00:00
ar-transport.c af_rxrpc: Add sysctls for configuring RxRPC parameters 2014-02-26 17:25:06 +00:00
Kconfig
Makefile af_rxrpc: Add sysctls for configuring RxRPC parameters 2014-02-26 17:25:06 +00:00
rxkad.c
sysctl.c af_rxrpc: Expose more RxRPC parameters via sysctls 2014-02-26 17:25:07 +00:00