[PATCH 4/6] ipc/msg.c: Update and document memory barriers.

[Manfred Spraul <manfred@colorfullife.com>]

Transfer findings from ipc/mqueue.c:
- A control barrier was missing for the lockless receive case
  So in theory, not yet initialized data may have been copied
  to user space - obviously only for architectures where
  control barriers are not NOP.

- use smp_store_release(). In theory, the refount
  may have been decreased to 0 already when wake_q_add()
  tries to get a reference.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
---
 ipc/msg.c | 44 ++++++++++++++++++++++++++++++++++++++------
 1 file changed, 38 insertions(+), 6 deletions(-)

diff --git a/ipc/msg.c b/ipc/msg.c
index 8dec945fa030..e6b20a7e6341 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -184,6 +184,10 @@ static inline void ss_add(struct msg_queue *msq,
 {
 	mss->tsk = current;
 	mss->msgsz = msgsz;
+	/*
+	 * No memory barrier required: we did ipc_lock_object(),
+	 * and the waker obtains that lock before calling wake_q_add().
+	 */
 	__set_current_state(TASK_INTERRUPTIBLE);
 	list_add_tail(&mss->list, &msq->q_senders);
 }
@@ -238,7 +242,14 @@ static void expunge_all(struct msg_queue *msq, int res,
 
 	list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
 		wake_q_add(wake_q, msr->r_tsk);
-		WRITE_ONCE(msr->r_msg, ERR_PTR(res));
+
+		/*
+		 * The barrier is required to ensure that the refcount increase
+		 * inside wake_q_add() is completed before the state is updated.
+		 *
+		 * The barrier pairs with READ_ONCE()+smp_mb__after_ctrl_dep().
+		 */
+		smp_store_release(&msr->r_msg, ERR_PTR(res));
 	}
 }
 
@@ -798,13 +809,17 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg,
 			list_del(&msr->r_list);
 			if (msr->r_maxsize < msg->m_ts) {
 				wake_q_add(wake_q, msr->r_tsk);
-				WRITE_ONCE(msr->r_msg, ERR_PTR(-E2BIG));
+
+				/* See expunge_all regarding memory barrier */
+				smp_store_release(&msr->r_msg, ERR_PTR(-E2BIG));
 			} else {
 				ipc_update_pid(&msq->q_lrpid, task_pid(msr->r_tsk));
 				msq->q_rtime = ktime_get_real_seconds();
 
 				wake_q_add(wake_q, msr->r_tsk);
-				WRITE_ONCE(msr->r_msg, msg);
+
+				/* See expunge_all regarding memory barrier */
+				smp_store_release(&msr->r_msg, msg);
 				return 1;
 			}
 		}
@@ -1154,7 +1169,11 @@ static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, in
 			msr_d.r_maxsize = INT_MAX;
 		else
 			msr_d.r_maxsize = bufsz;
-		msr_d.r_msg = ERR_PTR(-EAGAIN);
+
+		/* memory barrier not require due to ipc_lock_object() */
+		WRITE_ONCE(msr_d.r_msg, ERR_PTR(-EAGAIN));
+
+		/* memory barrier not required, we own ipc_lock_object() */
 		__set_current_state(TASK_INTERRUPTIBLE);
 
 		ipc_unlock_object(&msq->q_perm);
@@ -1183,8 +1202,21 @@ static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, in
 		 * signal) it will either see the message and continue ...
 		 */
 		msg = READ_ONCE(msr_d.r_msg);
-		if (msg != ERR_PTR(-EAGAIN))
+		if (msg != ERR_PTR(-EAGAIN)) {
+			/*
+			 * Memory barrier for msr_d.r_msg
+			 * The smp_acquire__after_ctrl_dep(), together with the
+			 * READ_ONCE() above pairs with the barrier inside
+			 * wake_q_add().
+			 * The barrier protects the accesses to the message in
+			 * do_msg_fill(). In addition, the barrier protects user
+			 * space, too: User space may assume that all data from
+			 * the CPU that sent the message is visible.
+			 */
+			smp_acquire__after_ctrl_dep();
+
 			goto out_unlock1;
+		}
 
 		 /*
 		  * ... or see -EAGAIN, acquire the lock to check the message
@@ -1192,7 +1224,7 @@ static long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, in
 		  */
 		ipc_lock_object(&msq->q_perm);
 
-		msg = msr_d.r_msg;
+		msg = READ_ONCE(msr_d.r_msg);
 		if (msg != ERR_PTR(-EAGAIN))
 			goto out_unlock0;
 
-- 
2.21.0