netdev - [bpf PATCH 0/4] sockhash/sockmap fixes

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Message-ID: <20180705152803.15312.47795.stgit@john-Precision-Tower-5810>
Date:   Thu, 05 Jul 2018 08:36:11 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     ast@...nel.org, daniel@...earbox.net
Cc:     netdev@...r.kernel.org, john.fastabend@...il.com
Subject: [bpf PATCH 0/4] sockhash/sockmap fixes

First three patches resolve issues found while testing sockhash and
reviewing code. Syzbot also found them about the same time as I was
working on fixes. The main issue is in the sockhash path we reduced
the scope of sk_callback lock but this meant we could get update and
close running in parallel so fix that here.

Then testing sk_msg and sk_skb programs together found that skb->dev
is not always assigned and some of the helpers were depending on this
to lookup max mtu. Fix this by using SKB_MAX_ALLOC when no MTU is
available.

Finally, Martin spotted that the sockmap code was still using the
qdisc skb cb structure. But I was sure we had fixed this long ago.
Looks like we missed it in a merge conflict resolution and then by
chance data_end offset was the same in both structures so everything
sort of continued to work even though it could break at any moment
if the structs ever change. So redo the conversion and this time
also convert the helpers.

---

John Fastabend (4):
      bpf: fix sk_skb programs without skb->dev assigned
      bpf: sockhash, disallow bpf_tcp_close and update in parallel
      bpf: sockmap, consume_skb in close path
      bpf: sockmap, convert bpf_compute_data_pointers to bpf_*_sk_skb

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