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tcp: annotate data-races around tp->tsoffset 

do_tcp_getsockopt() reads tp->tsoffset while another cpu
might change its value.

Fixes: 93be6ce0e9 ("tcp: set and get per-socket timestamp")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230719212857.3943972-3-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-07-19 21:28:48 +00:00 committed by Jakub Kicinski
parent 348b81b68b
commit dd23c9f1e8
2 changed files with 5 additions and 4 deletions
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4
net/ipv4/tcp.c
View File

@ -3656,7 +3656,7 @@ int do_tcp_setsockopt(struct sock *sk, int level, int optname,
if (!tp->repair)
err = -EPERM;
else
tp->tsoffset = val - tcp_time_stamp_raw();
WRITE_ONCE(tp->tsoffset, val - tcp_time_stamp_raw());
break;
case TCP_REPAIR_WINDOW:
err = tcp_repair_set_window(tp, optval, optlen);
@ -4158,7 +4158,7 @@ int do_tcp_getsockopt(struct sock *sk, int level,
break;
case TCP_TIMESTAMP:
val = tcp_time_stamp_raw() + tp->tsoffset;
val = tcp_time_stamp_raw() + READ_ONCE(tp->tsoffset);
break;
case TCP_NOTSENT_LOWAT:
val = tp->notsent_lowat;

5
net/ipv4/tcp_ipv4.c
View File

@ -307,8 +307,9 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
inet->inet_daddr,
inet->inet_sport,
usin->sin_port));
tp->tsoffset = secure_tcp_ts_off(net, inet->inet_saddr,
inet->inet_daddr);
WRITE_ONCE(tp->tsoffset,
secure_tcp_ts_off(net, inet->inet_saddr,
inet->inet_daddr));
}
inet->inet_id = get_random_u16();