[PATCH v4 net 00/17] net: sysctl: Fix data-races around net.core.XXX

[Kuniyuki Iwashima <kuniyu@amazon.com>]

This series fixes data-races around all knobs in net_core_table and
netns_core_table except for bpf stuff.

These knobs are skipped:

  - 4 bpf knobs
  - netdev_rss_key: Written only once by net_get_random_once() and
                    read-only knob
  - rps_sock_flow_entries: Protected with sock_flow_mutex
  - flow_limit_cpu_bitmap: Protected with flow_limit_update_mutex
  - flow_limit_table_len: Protected with flow_limit_update_mutex
  - default_qdisc: Protected with qdisc_mod_lock
  - warnings: Unused
  - high_order_alloc_disable: Protected with static_key_mutex
  - skb_defer_max: Already using READ_ONCE()
  - sysctl_txrehash: Already using READ_ONCE()

Note 5th patch fixes net.core.message_cost and net.core.message_burst,
and lib/ratelimit.c does not have an explicit maintainer.

Changes:
  v4:
    * Add mutex in patch 2
    * Add comments in patch 5

  v3: https://lore.kernel.org/netdev/20220818182653.38940-1-kuniyu@amazon.com/
    * Fix build failures of CONFIG_SYSCTL=n case in 13th & 14th patches

  v2: https://lore.kernel.org/netdev/20220818035227.81567-1-kuniyu@amazon.com/
    * Remove 4 bpf knobs and added 6 knobs

  v1: https://lore.kernel.org/netdev/20220816052347.70042-1-kuniyu@amazon.com/


Kuniyuki Iwashima (17):
  net: Fix data-races around sysctl_[rw]mem_(max|default).
  net: Fix data-races around weight_p and dev_weight_[rt]x_bias.
  net: Fix data-races around netdev_max_backlog.
  net: Fix data-races around netdev_tstamp_prequeue.
  ratelimit: Fix data-races in ___ratelimit().
  net: Fix data-races around sysctl_optmem_max.
  net: Fix a data-race around sysctl_tstamp_allow_data.
  net: Fix a data-race around sysctl_net_busy_poll.
  net: Fix a data-race around sysctl_net_busy_read.
  net: Fix a data-race around netdev_budget.
  net: Fix data-races around sysctl_max_skb_frags.
  net: Fix a data-race around netdev_budget_usecs.
  net: Fix data-races around sysctl_fb_tunnels_only_for_init_net.
  net: Fix data-races around sysctl_devconf_inherit_init_net.
  net: Fix a data-race around gro_normal_batch.
  net: Fix a data-race around netdev_unregister_timeout_secs.
  net: Fix a data-race around sysctl_somaxconn.

 Documentation/admin-guide/sysctl/net.rst |  2 +-
 include/linux/netdevice.h                | 20 +++++++++++++++++---
 include/net/busy_poll.h                  |  2 +-
 include/net/gro.h                        |  2 +-
 lib/ratelimit.c                          | 12 +++++++++---
 net/core/bpf_sk_storage.c                |  5 +++--
 net/core/dev.c                           | 20 ++++++++++----------
 net/core/filter.c                        | 13 +++++++------
 net/core/gro_cells.c                     |  2 +-
 net/core/skbuff.c                        |  2 +-
 net/core/sock.c                          | 18 ++++++++++--------
 net/core/sysctl_net_core.c               | 15 +++++++++------
 net/ipv4/devinet.c                       | 16 ++++++++++------
 net/ipv4/ip_output.c                     |  2 +-
 net/ipv4/ip_sockglue.c                   |  6 +++---
 net/ipv4/tcp.c                           |  4 ++--
 net/ipv4/tcp_output.c                    |  2 +-
 net/ipv6/addrconf.c                      |  5 ++---
 net/ipv6/ipv6_sockglue.c                 |  4 ++--
 net/mptcp/protocol.c                     |  2 +-
 net/netfilter/ipvs/ip_vs_sync.c          |  4 ++--
 net/sched/sch_generic.c                  |  2 +-
 net/socket.c                             |  2 +-
 net/xfrm/espintcp.c                      |  2 +-
 net/xfrm/xfrm_input.c                    |  2 +-
 25 files changed, 98 insertions(+), 68 deletions(-)

-- 
2.30.2