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Merge branch 'af_unix-fix-two-data-races-reported-by-kcsan' 

Kuniyuki Iwashima says:

====================
af_unix: Fix two data races reported by KCSAN.

KCSAN reported data races around these two fields for AF_UNIX sockets.

  * sk->sk_receive_queue->qlen
  * sk->sk_shutdown

Let's annotate them properly.
====================

Link: https://lore.kernel.org/r/20230510003456.42357-1-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-05-10 19:06:55 -07:00
parent 5bca1d081f e1d09c2c2f
commit 33dcee99e0
1 changed files with 13 additions and 9 deletions
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22
net/unix/af_unix.c
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@ -603,7 +603,7 @@ static void unix_release_sock(struct sock *sk, int embrion)
/* Clear state */
unix_state_lock(sk);
sock_orphan(sk);
sk->sk_shutdown = SHUTDOWN_MASK;
WRITE_ONCE(sk->sk_shutdown, SHUTDOWN_MASK);
path = u->path;
u->path.dentry = NULL;
u->path.mnt = NULL;
@ -628,7 +628,7 @@ static void unix_release_sock(struct sock *sk, int embrion)
if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) {
unix_state_lock(skpair);
/* No more writes */
skpair->sk_shutdown = SHUTDOWN_MASK;
WRITE_ONCE(skpair->sk_shutdown, SHUTDOWN_MASK);
if (!skb_queue_empty(&sk->sk_receive_queue) || embrion)
WRITE_ONCE(skpair->sk_err, ECONNRESET);
unix_state_unlock(skpair);
@ -1442,7 +1442,7 @@ static long unix_wait_for_peer(struct sock *other, long timeo)
sched = !sock_flag(other, SOCK_DEAD) &&
!(other->sk_shutdown & RCV_SHUTDOWN) &&
unix_recvq_full(other);
unix_recvq_full_lockless(other);
unix_state_unlock(other);
@ -3008,7 +3008,7 @@ static int unix_shutdown(struct socket *sock, int mode)
++mode;
unix_state_lock(sk);
sk->sk_shutdown |= mode;
WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | mode);
other = unix_peer(sk);
if (other)
sock_hold(other);
@ -3028,7 +3028,7 @@ static int unix_shutdown(struct socket *sock, int mode)
if (mode&SEND_SHUTDOWN)
peer_mode |= RCV_SHUTDOWN;
unix_state_lock(other);
other->sk_shutdown |= peer_mode;
WRITE_ONCE(other->sk_shutdown, other->sk_shutdown | peer_mode);
unix_state_unlock(other);
other->sk_state_change(other);
if (peer_mode == SHUTDOWN_MASK)
@ -3160,16 +3160,18 @@ static __poll_t unix_poll(struct file *file, struct socket *sock, poll_table *wa
{
struct sock *sk = sock->sk;
__poll_t mask;
u8 shutdown;
sock_poll_wait(file, sock, wait);
mask = 0;
shutdown = READ_ONCE(sk->sk_shutdown);
/* exceptional events? */
if (READ_ONCE(sk->sk_err))
mask |= EPOLLERR;
if (sk->sk_shutdown == SHUTDOWN_MASK)
if (shutdown == SHUTDOWN_MASK)
mask |= EPOLLHUP;
if (sk->sk_shutdown & RCV_SHUTDOWN)
if (shutdown & RCV_SHUTDOWN)
mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
/* readable? */
@ -3203,9 +3205,11 @@ static __poll_t unix_dgram_poll(struct file *file, struct socket *sock,
struct sock *sk = sock->sk, *other;
unsigned int writable;
__poll_t mask;
u8 shutdown;
sock_poll_wait(file, sock, wait);
mask = 0;
shutdown = READ_ONCE(sk->sk_shutdown);
/* exceptional events? */
if (READ_ONCE(sk->sk_err) ||
@ -3213,9 +3217,9 @@ static __poll_t unix_dgram_poll(struct file *file, struct socket *sock,
mask |= EPOLLERR |
(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
if (sk->sk_shutdown & RCV_SHUTDOWN)
if (shutdown & RCV_SHUTDOWN)
mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
if (sk->sk_shutdown == SHUTDOWN_MASK)
if (shutdown == SHUTDOWN_MASK)
mask |= EPOLLHUP;
/* readable? */