diff options
author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-10-22 00:07:47 +0200 |
---|---|---|
committer | Luis Henriques <luis.henriques@canonical.com> | 2013-10-25 10:55:09 +0100 |
commit | 4eff4eb0b74b29c7c41419203ffa29235d1f1214 (patch) | |
tree | 4a4a4a36a1f151bb098d95bd2ff8de42ed9f6ba1 | |
parent | 9c1bea1afe4865fc5e1d5182f9e38a8ea09889ba (diff) |
inet: fix possible memory corruption with UDP_CORK and UFO
[ This is a simplified -stable version of a set of upstream commits. ]
This is a replacement patch only for stable which does fix the problems
handled by the following two commits in -net:
"ip_output: do skb ufo init for peeked non ufo skb as well" (e93b7d748be887cd7639b113ba7d7ef792a7efb9)
"ip6_output: do skb ufo init for peeked non ufo skb as well" (c547dbf55d5f8cf615ccc0e7265e98db27d3fb8b)
Three frames are written on a corked udp socket for which the output
netdevice has UFO enabled. If the first and third frame are smaller than
the mtu and the second one is bigger, we enqueue the second frame with
skb_append_datato_frags without initializing the gso fields. This leads
to the third frame appended regulary and thus constructing an invalid skb.
This fixes the problem by always using skb_append_datato_frags as soon
as the first frag got enqueued to the skb without marking the packet
as SKB_GSO_UDP.
The problem with only two frames for ipv6 was fixed by "ipv6: udp
packets following an UFO enqueued packet need also be handled by UFO"
(2811ebac2521ceac84f2bdae402455baa6a7fb47).
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
-rw-r--r-- | include/linux/skbuff.h | 5 | ||||
-rw-r--r-- | net/ipv4/ip_output.c | 2 | ||||
-rw-r--r-- | net/ipv6/ip6_output.c | 2 |
3 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 0ec478895617..160f3ea49d12 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1226,6 +1226,11 @@ static inline int skb_pagelen(const struct sk_buff *skb) return len + skb_headlen(skb); } +static inline bool skb_has_frags(const struct sk_buff *skb) +{ + return skb_shinfo(skb)->nr_frags; +} + /** * __skb_fill_page_desc - initialise a paged fragment in an skb * @skb: buffer containing fragment to be initialised diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 7ee32c613548..ed8270fa0dae 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -846,7 +846,7 @@ static int __ip_append_data(struct sock *sk, csummode = CHECKSUM_PARTIAL; cork->length += length; - if (((length > mtu) || (skb && skb_is_gso(skb))) && + if (((length > mtu) || (skb && skb_has_frags(skb))) && (sk->sk_protocol == IPPROTO_UDP) && (rt->dst.dev->features & NETIF_F_UFO) && !rt->dst.header_len) { err = ip_ufo_append_data(sk, queue, getfrag, from, length, diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index d00f1ad64bf2..01cf1cd6f524 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1351,7 +1351,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, skb = skb_peek_tail(&sk->sk_write_queue); cork->length += length; if (((length > mtu) || - (skb && skb_is_gso(skb))) && + (skb && skb_has_frags(skb))) && (sk->sk_protocol == IPPROTO_UDP) && (rt->dst.dev->features & NETIF_F_UFO)) { err = ip6_ufo_append_data(sk, getfrag, from, length, |