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| author | Michal Luczaj <mhal@rbox.co> | 2026-04-14 16:13:15 +0200 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2026-04-15 17:22:42 -0700 |
| commit | a25566084e391348385a72dd507e0cc0c268dd5d (patch) | |
| tree | c92342112d5260c5550d86ea3b545d7d0f076ad3 /net | |
| parent | 9d8e92e15f75794c469f586a2c47fab58f093a3a (diff) | |
| download | lwn-a25566084e391348385a72dd507e0cc0c268dd5d.tar.gz lwn-a25566084e391348385a72dd507e0cc0c268dd5d.zip | |
bpf, sockmap: Annotate af_unix sock:: Sk_state data-races
sock_map_sk_state_allowed() and sock_map_redirect_allowed() read af_unix
socket sk_state locklessly.
Use READ_ONCE(). Note that for sock_map_redirect_allowed() change affects
not only af_unix, but all non-TCP sockets (UDP, af_vsock).
Suggested-by: Kuniyuki Iwashima <kuniyu@google.com>
Suggested-by: Martin KaFai Lau <martin.lau@linux.dev>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260414-unix-proto-update-null-ptr-deref-v4-1-2af6fe97918e@rbox.co
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock_map.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/sock_map.c b/net/core/sock_map.c index b0e96337a269..02a68be3002a 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -530,7 +530,7 @@ static bool sock_map_redirect_allowed(const struct sock *sk) if (sk_is_tcp(sk)) return sk->sk_state != TCP_LISTEN; else - return sk->sk_state == TCP_ESTABLISHED; + return READ_ONCE(sk->sk_state) == TCP_ESTABLISHED; } static bool sock_map_sk_is_suitable(const struct sock *sk) @@ -543,7 +543,7 @@ static bool sock_map_sk_state_allowed(const struct sock *sk) if (sk_is_tcp(sk)) return (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_LISTEN); if (sk_is_stream_unix(sk)) - return (1 << sk->sk_state) & TCPF_ESTABLISHED; + return (1 << READ_ONCE(sk->sk_state)) & TCPF_ESTABLISHED; if (sk_is_vsock(sk) && (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) return (1 << sk->sk_state) & TCPF_ESTABLISHED; |