summaryrefslogtreecommitdiffstats
path: root/net/rxrpc
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2017-11-02 15:06:08 +0000
committerDavid Howells <dhowells@redhat.com>2017-11-02 15:07:18 +0000
commit20acbd9a7aeee0b0af7107f3de791a52c949f3ac (patch)
tree654bcbd298a68ae8f44d161536cc16f66692e7fd /net/rxrpc
parent2d2faaf0568b4946d9abeb4e541227b4ca259840 (diff)
downloadlinux-20acbd9a7aeee0b0af7107f3de791a52c949f3ac.tar.bz2
rxrpc: Lock around calling a kernel service Rx notification
Place a spinlock around the invocation of call->notify_rx() for a kernel service call and lock again when ending the call and replace the notification pointer with a pointer to a dummy function. This is required because it's possible for rxrpc_notify_socket() to be called after the call has been ended by the kernel service if called from the asynchronous work function rxrpc_process_call(). However, rxrpc_notify_socket() currently only holds the RCU read lock when invoking ->notify_rx(), which means that the afs_call struct would need to be disposed of by call_rcu() rather than by kfree(). But we shouldn't see any notifications from a call after calling rxrpc_kernel_end_call(), so a lock is required in rxrpc code. Without this, we may see the call wait queue as having a corrupt spinlock: BUG: spinlock bad magic on CPU#0, kworker/0:2/1612 general protection fault: 0000 [#1] SMP ... Workqueue: krxrpcd rxrpc_process_call task: ffff88040b83c400 task.stack: ffff88040adfc000 RIP: 0010:spin_bug+0x161/0x18f RSP: 0018:ffff88040adffcc0 EFLAGS: 00010002 RAX: 0000000000000032 RBX: 6b6b6b6b6b6b6b6b RCX: ffffffff81ab16cf RDX: ffff88041fa14c01 RSI: ffff88041fa0ccb8 RDI: ffff88041fa0ccb8 RBP: ffff88040adffcd8 R08: 00000000ffffffff R09: 00000000ffffffff R10: ffff88040adffc60 R11: 000000000000022c R12: ffff88040aca2208 R13: ffffffff81a58114 R14: 0000000000000000 R15: 0000000000000000 .... Call Trace: do_raw_spin_lock+0x1d/0x89 _raw_spin_lock_irqsave+0x3d/0x49 ? __wake_up_common_lock+0x4c/0xa7 __wake_up_common_lock+0x4c/0xa7 ? __lock_is_held+0x47/0x7a __wake_up+0xe/0x10 afs_wake_up_call_waiter+0x11b/0x122 [kafs] rxrpc_notify_socket+0x12b/0x258 rxrpc_process_call+0x18e/0x7d0 process_one_work+0x298/0x4de ? rescuer_thread+0x280/0x280 worker_thread+0x1d1/0x2ae ? rescuer_thread+0x280/0x280 kthread+0x12c/0x134 ? kthread_create_on_node+0x3a/0x3a ret_from_fork+0x27/0x40 In this case, note the corrupt data in EBX. The address of the offending afs_call is in R12, plus the offset to the spinlock. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/af_rxrpc.c16
-rw-r--r--net/rxrpc/ar-internal.h1
-rw-r--r--net/rxrpc/call_object.c1
-rw-r--r--net/rxrpc/recvmsg.c2
4 files changed, 20 insertions, 0 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 344b2dcad52d..9b5c46b052fd 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -322,6 +322,14 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
}
EXPORT_SYMBOL(rxrpc_kernel_begin_call);
+/*
+ * Dummy function used to stop the notifier talking to recvmsg().
+ */
+static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+}
+
/**
* rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
* @sock: The socket the call is on
@@ -336,6 +344,14 @@ void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
mutex_lock(&call->user_mutex);
rxrpc_release_call(rxrpc_sk(sock->sk), call);
+
+ /* Make sure we're not going to call back into a kernel service */
+ if (call->notify_rx) {
+ spin_lock_bh(&call->notify_lock);
+ call->notify_rx = rxrpc_dummy_notify_rx;
+ spin_unlock_bh(&call->notify_lock);
+ }
+
mutex_unlock(&call->user_mutex);
rxrpc_put_call(call, rxrpc_call_put_kernel);
}
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index ea5600b747cc..b2151993d384 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -525,6 +525,7 @@ struct rxrpc_call {
unsigned long flags;
unsigned long events;
spinlock_t lock;
+ spinlock_t notify_lock; /* Kernel notification lock */
rwlock_t state_lock; /* lock for state transition */
u32 abort_code; /* Local/remote abort code */
int error; /* Local error incurred */
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index fcdd6555a820..4c7fbc6dcce7 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -124,6 +124,7 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
INIT_LIST_HEAD(&call->sock_link);
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->lock);
+ spin_lock_init(&call->notify_lock);
rwlock_init(&call->state_lock);
atomic_set(&call->usage, 1);
call->debug_id = atomic_inc_return(&rxrpc_debug_id);
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index e4937b3f3685..8510a98b87e1 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -40,7 +40,9 @@ void rxrpc_notify_socket(struct rxrpc_call *call)
sk = &rx->sk;
if (rx && sk->sk_state < RXRPC_CLOSE) {
if (call->notify_rx) {
+ spin_lock_bh(&call->notify_lock);
call->notify_rx(sk, call, call->user_call_ID);
+ spin_unlock_bh(&call->notify_lock);
} else {
write_lock_bh(&rx->recvmsg_lock);
if (list_empty(&call->recvmsg_link)) {