diff options
| author | Sasha Levin <sasha.levin@oracle.com> | 2013-12-08 02:26:27 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-16 03:27:11 +0400 |
| commit | e387172fe3c3f5d256f183c0f88c9f0dc5434a88 (patch) | |
| tree | 2869b0c303eb867b899857588ab9bf9a9f8c9f78 /net | |
| parent | fcbb1132558f68da2ce37a883be165129aa1eb31 (diff) | |
| download | linux-e387172fe3c3f5d256f183c0f88c9f0dc5434a88.tar.xz | |
net: unix: allow set_peek_off to fail
[ Upstream commit 12663bfc97c8b3fdb292428105dd92d563164050 ]
unix_dgram_recvmsg() will hold the readlock of the socket until recv
is complete.
In the same time, we may try to setsockopt(SO_PEEK_OFF) which will hang until
unix_dgram_recvmsg() will complete (which can take a while) without allowing
us to break out of it, triggering a hung task spew.
Instead, allow set_peek_off to fail, this way userspace will not hang.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock.c | 2 | ||||
| -rw-r--r-- | net/unix/af_unix.c | 8 |
2 files changed, 7 insertions, 3 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 561eb57f590c..832cf043a8f7 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -795,7 +795,7 @@ set_rcvbuf: case SO_PEEK_OFF: if (sock->ops->set_peek_off) - sock->ops->set_peek_off(sk, val); + ret = sock->ops->set_peek_off(sk, val); else ret = -EOPNOTSUPP; break; diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 0540dd9b0387..8519968f487f 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -524,13 +524,17 @@ static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, static int unix_seqpacket_recvmsg(struct kiocb *, struct socket *, struct msghdr *, size_t, int); -static void unix_set_peek_off(struct sock *sk, int val) +static int unix_set_peek_off(struct sock *sk, int val) { struct unix_sock *u = unix_sk(sk); - mutex_lock(&u->readlock); + if (mutex_lock_interruptible(&u->readlock)) + return -EINTR; + sk->sk_peek_off = val; mutex_unlock(&u->readlock); + + return 0; } |