diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2016-06-23 16:28:58 +0100 |
|---|---|---|
| committer | Alistair Strachan <astrachan@google.com> | 2019-05-14 17:56:56 -0700 |
| commit | d279af442001d03b41af233e97549f4b23d403a0 (patch) | |
| tree | 54bb025f81a01ec093a5278fcd6bd9acf34c65a6 | |
| parent | ef6c5bb7eb80e44863fd54f97a77ed7e21b57dc8 (diff) | |
UPSTREAM: vsock: make listener child lock ordering explicit
There are several places where the listener and pending or accept queue
child sockets are accessed at the same time. Lockdep is unhappy that
two locks from the same class are held.
Tell lockdep that it is safe and document the lock ordering.
Originally Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> sent a similar
patch asking whether this is safe. I have audited the code and also
covered the vsock_pending_work() function.
Suggested-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 4192f672fae559f32d82de72a677701853cc98a7)
Bug: 121166534
Test: Ran cuttlefish with android-4.4 + VSOCKETS, VMWARE_VMCI_VSOCKETS
Signed-off-by: Cody Schuffelen <schuffelen@google.com>
Change-Id: I0cb7ee964057e9338971e1a2043ae17557feaec7
| -rw-r--r-- | net/vmw_vsock/af_vsock.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 2cb12fe3b60d..611e3b13675e 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -61,6 +61,14 @@ * function will also cleanup rejected sockets, those that reach the connected * state but leave it before they have been accepted. * + * - Lock ordering for pending or accept queue sockets is: + * + * lock_sock(listener); + * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); + * + * Using explicit nested locking keeps lockdep happy since normally only one + * lock of a given class may be taken at a time. + * * - Sockets created by user action will be cleaned up when the user process * calls close(2), causing our release implementation to be called. Our release * implementation will perform some cleanup then drop the last reference so our @@ -443,7 +451,7 @@ static void vsock_pending_work(struct work_struct *work) cleanup = true; lock_sock(listener); - lock_sock(sk); + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); if (vsock_is_pending(sk)) { vsock_remove_pending(listener, sk); @@ -1293,7 +1301,7 @@ static int vsock_accept(struct socket *sock, struct socket *newsock, int flags) if (connected) { listener->sk_ack_backlog--; - lock_sock(connected); + lock_sock_nested(connected, SINGLE_DEPTH_NESTING); vconnected = vsock_sk(connected); /* If the listener socket has received an error, then we should |