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gso: validate gso_type in GSO handlers

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Validate gso_type during segmentation as SKB_GSO_DODGY sources
may pass packets where the gso_type does not match the contents.

Syzkaller was able to enter the SCTP gso handler with a packet of
gso_type SKB_GSO_TCPV4.

On entry of transport layer gso handlers, verify that the gso_type
matches the transport protocol.

Fixes: 90017accff ("sctp: Add GSO support")
Link: http://lkml.kernel.org/r/<[email protected]>
Reported-by: [email protected]
Signed-off-by: Willem de Bruijn <[email protected]>
Acked-by: Jason Wang <[email protected]>
Reviewed-by: Marcelo Ricardo Leitner <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Willem de Bruijn 2018-01-19 09:29:18 -05:00 • committed by David S. Miller
commit 121d57af30
7 changed files with 21 additions and 0 deletions
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3
net/ipv4/esp4_offload.c
View file

@ -122,6 +122,9 @@ static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
if (!xo)
goto out;
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP))
goto out;
seq = xo->seq.low;
x = skb->sp->xvec[skb->sp->len - 1];

3
net/ipv4/tcp_offload.c
View file

@ -32,6 +32,9 @@ static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4))
return ERR_PTR(-EINVAL);
if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
return ERR_PTR(-EINVAL);

3
net/ipv4/udp_offload.c
View file

@ -203,6 +203,9 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
goto out;
}
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP))
goto out;
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
goto out;