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| author | Eric Dumazet <edumazet@google.com> | 2023-07-28 15:03:09 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-11 12:08:13 +0200 |
| commit | 0317c8322d9ac86a2bf251f94efc7fe96643e0fb (patch) | |
| tree | 8ca4d9ede5696e7e93ff0c3b80ee6a893cfac17f /net/core | |
| parent | 60d92bc9c0940a8492a025b54224b6f063932736 (diff) | |
| download | linux-0317c8322d9ac86a2bf251f94efc7fe96643e0fb.tar.gz | |
net: annotate data-race around sk->sk_txrehash
[ Upstream commit c76a0328899bbe226f8adeb88b8da9e4167bd316 ]
sk_getsockopt() runs locklessly. This means sk->sk_txrehash
can be read while other threads are changing its value.
Other locations were handled in commit cb6cd2cec799
("tcp: Change SYN ACK retransmit behaviour to account for rehash")
Fixes: 26859240e4ee ("txhash: Add socket option to control TX hash rethink behavior")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Akhmat Karakotov <hmukos@yandex-team.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/sock.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 9483820833c5..77abd69c56dd 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1521,7 +1521,9 @@ set_sndbuf: } if ((u8)val == SOCK_TXREHASH_DEFAULT) val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash); - /* Paired with READ_ONCE() in tcp_rtx_synack() */ + /* Paired with READ_ONCE() in tcp_rtx_synack() + * and sk_getsockopt(). + */ WRITE_ONCE(sk->sk_txrehash, (u8)val); break; @@ -1927,7 +1929,8 @@ int sk_getsockopt(struct sock *sk, int level, int optname, break; case SO_TXREHASH: - v.val = sk->sk_txrehash; + /* Paired with WRITE_ONCE() in sk_setsockopt() */ + v.val = READ_ONCE(sk->sk_txrehash); break; default: |