netdev - [PATCH net-next 00/10] udp: round of data-races fixes

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Date: Tue, 12 Sep 2023 09:17:20 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 00/10] udp: round of data-races fixes

This series is inspired by multiple syzbot reports.

Many udp fields reads or writes are racy.

Add a proper udp->udp_flags and move there all
flags needing atomic safety.

Also add missing READ_ONCE()/WRITE_ONCE() when
lockless readers need access to specific fields.

Eric Dumazet (10):
  udp: introduce udp->udp_flags
  udp: move udp->no_check6_tx to udp->udp_flags
  udp: move udp->no_check6_rx to udp->udp_flags
  udp: move udp->gro_enabled to udp->udp_flags
  udp: add missing WRITE_ONCE() around up->encap_rcv
  udp: move udp->accept_udp_{l4|fraglist} to udp->udp_flags
  udp: lockless UDP_ENCAP_L2TPINUDP / UDP_GRO
  udp: annotate data-races around udp->encap_type
  udplite: remove UDPLITE_BIT
  udplite: fix various data-races

 drivers/net/gtp.c          |  4 +--
 include/linux/udp.h        | 66 ++++++++++++++++++++--------------
 include/net/udp_tunnel.h   |  9 ++---
 include/net/udplite.h      | 14 +++++---
 net/ipv4/udp.c             | 74 +++++++++++++++++++-------------------
 net/ipv4/udp_offload.c     |  4 +--
 net/ipv4/udp_tunnel_core.c |  2 +-
 net/ipv4/udplite.c         |  1 -
 net/ipv4/xfrm4_input.c     |  4 +--
 net/ipv6/udp.c             | 34 +++++++++---------
 net/ipv6/udplite.c         |  1 -
 net/ipv6/xfrm6_input.c     |  4 +--
 net/l2tp/l2tp_core.c       |  6 ++--
 13 files changed, 118 insertions(+), 105 deletions(-)

-- 
2.42.0.283.g2d96d420d3-goog