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| author | Eric Dumazet <edumazet@google.com> | 2023-07-19 21:28:48 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-07-20 12:34:18 -0700 |
| commit | dd23c9f1e8d5c1d2e3d29393412385ccb9c7a948 (patch) | |
| tree | b7d8227c1b6611044c615f883faa6144ea84cb7e /net/ipv4 | |
| parent | 348b81b68b13ebd489a3e6a46aa1c384c731c919 (diff) | |
| download | linux-dd23c9f1e8d5c1d2e3d29393412385ccb9c7a948.tar.gz linux-dd23c9f1e8d5c1d2e3d29393412385ccb9c7a948.tar.bz2 linux-dd23c9f1e8d5c1d2e3d29393412385ccb9c7a948.zip | |
tcp: annotate data-races around tp->tsoffset
do_tcp_getsockopt() reads tp->tsoffset while another cpu
might change its value.
Fixes: 93be6ce0e91b ("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>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp.c | 4 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 5 |
2 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index bd6400e1ae9f..03ae6554c78d 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -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; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index b5c81cf5b86f..069642014636 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -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(); |