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| author | Eric Dumazet <edumazet@google.com> | 2023-07-28 15:03:10 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-07-29 18:13:41 +0100 |
| commit | ea7f45ef77b39e72244d282e47f6cb1ef4135cd2 (patch) | |
| tree | 5bdc4e61b408719dc8d8d31a92120aaf6644e4fe /net | |
| parent | c76a0328899bbe226f8adeb88b8da9e4167bd316 (diff) | |
| download | linux-ea7f45ef77b39e72244d282e47f6cb1ef4135cd2.tar.gz linux-ea7f45ef77b39e72244d282e47f6cb1ef4135cd2.tar.bz2 linux-ea7f45ef77b39e72244d282e47f6cb1ef4135cd2.zip | |
net: annotate data-races around sk->sk_max_pacing_rate
sk_getsockopt() runs locklessly. This means sk->sk_max_pacing_rate
can be read while other threads are changing its value.
Fixes: 62748f32d501 ("net: introduce SO_MAX_PACING_RATE")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index adec93dda56a..fec18755f772 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1439,7 +1439,8 @@ set_sndbuf: cmpxchg(&sk->sk_pacing_status, SK_PACING_NONE, SK_PACING_NEEDED); - sk->sk_max_pacing_rate = ulval; + /* Pairs with READ_ONCE() from sk_getsockopt() */ + WRITE_ONCE(sk->sk_max_pacing_rate, ulval); sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval); break; } @@ -1903,12 +1904,14 @@ int sk_getsockopt(struct sock *sk, int level, int optname, #endif case SO_MAX_PACING_RATE: + /* The READ_ONCE() pair with the WRITE_ONCE() in sk_setsockopt() */ if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) { lv = sizeof(v.ulval); - v.ulval = sk->sk_max_pacing_rate; + v.ulval = READ_ONCE(sk->sk_max_pacing_rate); } else { /* 32bit version */ - v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U); + v.val = min_t(unsigned long, ~0U, + READ_ONCE(sk->sk_max_pacing_rate)); } break; |