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authorEric Dumazet <edumazet@google.com>2015-11-30 05:03:11 +0100
committerDavid S. Miller <davem@davemloft.net>2015-12-01 21:45:05 +0100
commitceb5d58b217098a657f3850b7a2640f995032e62 (patch)
tree4d12375d4193b130ec15daac9acea099b7083544 /net/core
parentnet: rename SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA (diff)
downloadlinux-ceb5d58b217098a657f3850b7a2640f995032e62.tar.xz
linux-ceb5d58b217098a657f3850b7a2640f995032e62.zip
net: fix sock_wake_async() rcu protection
Dmitry provided a syzkaller (http://github.com/google/syzkaller) triggering a fault in sock_wake_async() when async IO is requested. Said program stressed af_unix sockets, but the issue is generic and should be addressed in core networking stack. The problem is that by the time sock_wake_async() is called, we should not access the @flags field of 'struct socket', as the inode containing this socket might be freed without further notice, and without RCU grace period. We already maintain an RCU protected structure, "struct socket_wq" so moving SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA into it is the safe route. It also reduces number of cache lines needing dirtying, so might provide a performance improvement anyway. In followup patches, we might move remaining flags (SOCK_NOSPACE, SOCK_PASSCRED, SOCK_PASSSEC) to save 8 bytes and let 'struct socket' being mostly read and let it being shared between cpus. Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/stream.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/stream.c b/net/core/stream.c
index 43309428644d..b96f7a79e544 100644
--- a/net/core/stream.c
+++ b/net/core/stream.c
@@ -39,7 +39,7 @@ void sk_stream_write_space(struct sock *sk)
wake_up_interruptible_poll(&wq->wait, POLLOUT |
POLLWRNORM | POLLWRBAND);
if (wq && wq->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
- sock_wake_async(sock, SOCK_WAKE_SPACE, POLL_OUT);
+ sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
rcu_read_unlock();
}
}