diff options
| author | Eric Dumazet <edumazet@google.com> | 2019-10-09 15:32:35 -0700 |
|---|---|---|
| committer | Jakub Kicinski <jakub.kicinski@netronome.com> | 2019-10-09 21:43:00 -0700 |
| commit | eac66402d1c342f07ff38f8d631ff95eb7ad3220 (patch) | |
| tree | d25d4b62d8f9a01ed18b820307bfb0080a26a28f /net/core | |
| parent | 8265792bf8871acc2d00fd03883d830e2249d395 (diff) | |
net: annotate sk->sk_rcvlowat lockless reads
sock_rcvlowat() or int_sk_rcvlowat() might be called without the socket
lock for example from tcp_poll().
Use READ_ONCE() to document the fact that other cpus might change
sk->sk_rcvlowat under us and avoid KCSAN splats.
Use WRITE_ONCE() on write sides too.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 2 | ||||
| -rw-r--r-- | net/core/sock.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index ed6563622ce3..a50c0b6846f2 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4274,7 +4274,7 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, case SO_RCVLOWAT: if (val < 0) val = INT_MAX; - sk->sk_rcvlowat = val ? : 1; + WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); break; case SO_MARK: if (sk->sk_mark != val) { diff --git a/net/core/sock.c b/net/core/sock.c index 1cf06934da50..b7c5c6ea51ba 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -974,7 +974,7 @@ set_rcvbuf: if (sock->ops->set_rcvlowat) ret = sock->ops->set_rcvlowat(sk, val); else - sk->sk_rcvlowat = val ? : 1; + WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); break; case SO_RCVTIMEO_OLD: |