Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote:
> On Wed, Jul 04, 2018 at 07:34:54PM +0200, Pablo Neira Ayuso wrote:
> > On Thu, Jun 28, 2018 at 01:34:42PM +0200, Máté Eckl wrote:
> > > This patch fixes a silent out-of-bound read possibility that was present
> > > because of the misuse of this function.
> > >
> > > Mostly it was called with a struct udphdr *hp which had only the udphdr
> > > part linearized by the skb_header_pointer, however
> > > nf_tproxy_get_sock_v{4,6} uses it as a tcphdr pointer, so some reads for
> > > tcp specific attributes may be invalid.
> >
> > Applied, thanks.
>
> Wait, I think this may break UDP traffic over tproxy.
>
> If we get a UDP packet whose header + payload is smaller than the TCP
> header, this will break things.
Indeed, good catch. This will need to indicate l4 protocol as arg
to tell skb_header_pointer the correct l4 header size.
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